1. The utility model provides an easy friction roll and clearance compensation's planet roller power transmission mechanism which characterized in that:

the planetary gear set comprises a hollow input shaft (8), a planet carrier, an output shaft (7), two expansion rings (27) and N planetary roller assemblies, wherein N is an integer greater than 1; each planetary roller assembly comprises a planetary shaft (10) and a planetary roller (9) arranged on the planetary shaft (10);

the planet carrier is coaxially arranged in the hollow input shaft (8);

n planet shafts (10) of the N planet roller assemblies are circumferentially arranged on the planet carrier, two end parts of the N planet shafts extend out of the planet carrier, and a radial gap exists between each planet shaft (10) and the planet carrier and is used for gap compensation between the planet roller (9) and the hollow input shaft (8);

an internal thread (81) is arranged on the inner side surface of the hollow input shaft (8), and an external thread (91) matched with the internal thread (81) of the hollow input shaft (8) is arranged on each planetary roller (9);

or the inner side surface of the hollow input shaft (8) is provided with an internal thread (81), each planetary roller (9) is provided with an outer annular convex-concave groove matched with the internal thread (81) of the hollow input shaft (8), and the plurality of planetary rollers (9) are sequentially arranged along the axial direction of the hollow input shaft (8) in a staggered manner;

or an inner annular convex-concave groove is formed in the inner side face of the hollow input shaft (8), an external thread (91) matched with the inner annular convex-concave groove of the hollow input shaft (8) is formed in each planetary roller (9), and the plurality of planetary rollers (9) are sequentially arranged in a staggered mode along the axial direction of the hollow input shaft (8);

the two expansion rings (27) are respectively positioned on the outer sides of two end faces of the planet carrier, each expansion ring (27) is formed by connecting N outer rings (271) with inward openings and N inner rings (272) with outward openings in a staggered head-to-tail mode, the end parts of N planet shafts (10) are respectively clamped in the N inner rings (272) of the expansion rings (27), and the planet rollers (9) can rotate on the planet carrier; the minimum diameter of a circle where the centers of the N inner rings (272) of each expansion ring (27) are located is larger than the minimum diameter of a circle where the N planet shafts (10) are located;

the output shaft (7) is arranged on the front end face of the planet carrier, and the front end of the output shaft extends out of the hollow input shaft (8).

2. A planetary roller force transfer mechanism susceptible to friction rolling and backlash compensation as in claim 1, wherein:

n planet shafts (10) of the N planet roller assemblies are uniformly distributed on the planet carrier along the circumferential direction;

every planet roller (9) are provided with hollow input shaft (8) internal thread (81) complex outer annular tongue and groove, and a plurality of planet rollers (9) are along hollow input shaft (8) axial dislocation set in proper order, specifically are: each planetary roller (9) is provided with an outer annular convex-concave groove matched with the internal thread (81) of the hollow input shaft (8), the axial distance between every two adjacent planetary rollers (9) along the hollow input shaft (8) is 1/N of the pitch of the internal thread (81) of the hollow input shaft (8), and N is the number of the planetary roller assemblies;

every planet roller (9) be provided with hollow input shaft (8) interior annular tongue and groove complex external screw thread (91), a plurality of planet rollers (9) along hollow input shaft (8) axial dislocation set in proper order specifically do: each planetary roller (9) is provided with an external thread (91) matched with an internal annular convex-concave groove of the hollow input shaft (8), the axial distance between every two adjacent planetary rollers (9) along the hollow input shaft (8) is 1/N of the pitch of the external thread (91) of the planetary roller (9), and N is the number of the planetary roller assemblies.

3. A planetary roller force transmission mechanism susceptible to friction rolling and backlash compensation according to claim 1 or 2, characterized in that: the planet carrier is provided with N radial waist-shaped holes for installing N planet shafts (10) or N U-shaped open slots which are radially opened on the outer side surface of the planet carrier;

the cross section of the output shaft (7) is a circular or non-circular surface; or the hollow input shaft (8) is provided with a limit groove, and the output shaft (7) is provided with a limit bulge or a limit convex rib which can axially slide in the limit groove; or the output shaft (7) is provided with a limit groove, and the hollow input shaft (8) is provided with a limit bulge or a limit convex rib which can axially slide in the limit groove.

4. A planetary roller force transfer mechanism susceptible to friction rolling and backlash compensation as in claim 3, wherein:

the planet carrier is of an I-shaped structure and comprises a front planet carrier body (72), a rear planet carrier body (71) and a connecting rod arranged between the middle part of the front planet carrier body (72) and the middle part of the rear planet carrier body (71); a plurality of planetary rollers (9) are arranged on the outer periphery of the connecting rod;

or the planet carrier is of a squirrel-cage structure and comprises a front planet carrier body (72), a rear planet carrier body (71) and a squirrel-cage sleeve (73) arranged between the front planet carrier body (72) and the rear planet carrier body (71); the planetary rollers (9) are positioned in the squirrel-cage sleeve (73), and the planetary rollers (9) can be meshed with the internal thread (81) or the inner annular convex-concave groove of the hollow input shaft (8);

or the planet carrier is of an I-shaped squirrel cage structure and comprises a front planet carrier body (72), a rear planet carrier body (71), a squirrel cage type sleeve (73) arranged between the front planet carrier body (72) and the rear planet carrier body (71) and a connecting rod arranged between the middle of the front planet carrier body (72) and the middle of the rear planet carrier body (71), a plurality of planet rollers (9) are arranged on the periphery of the connecting rod and positioned in the squirrel cage type sleeve (73), and the planet rollers (9) can be meshed with the internal thread (81) of the hollow input shaft (8) or the inner annular convex-concave groove.

5. An easy friction rolling and backlash compensating planetary roller force transfer mechanism as in claim 4, wherein: each planet shaft (10) is provided with an automatic aligning mechanism, and the automatic aligning mechanism comprises a spherical aligning unit and a second thrust bearing (21), wherein the spherical aligning unit is sleeved on the planet shaft (10) and is positioned between the planet carrier and the planet roller (9);

the spherical aligning unit comprises a spherical seat (23) and a spherical lug (22) which are matched to form a spherical pair;

and a bearing (26) is arranged between the planet shaft (10) and the planet roller (9).

6. The utility model provides an easy friction roll and clearance compensation's electric brake device which characterized in that: comprises a shell, a driving motor (15) and a planetary roller force transmission mechanism arranged in the shell;

the planetary roller force transmission mechanism comprises a hollow input shaft (8), a planet carrier, an output shaft (7), two expansion rings (27) and N planetary roller assemblies, wherein N is an integer greater than 1; each planetary roller assembly comprises a planetary shaft (10) and a planetary roller (9) arranged on the planetary shaft (10);

the driving motor (15) drives the hollow input shaft (8) to rotate;

the planet carrier is coaxially arranged in the hollow input shaft (8);

n planet shafts (10) of the N planet roller assemblies are circumferentially arranged on the planet carrier, two end parts of the N planet shafts extend out of the planet carrier, and a radial gap exists between each planet shaft (10) and the planet carrier and is used for gap compensation between the planet roller (9) and the hollow input shaft (8);

an internal thread (81) is arranged on the inner side surface of the hollow input shaft (8), and an external thread (91) matched with the internal thread (81) of the hollow input shaft (8) is arranged on each planetary roller (9);

or the inner side surface of the hollow input shaft (8) is provided with an internal thread (81), each planetary roller (9) is provided with an outer annular convex-concave groove matched with the internal thread (81) of the hollow input shaft (8), and the plurality of planetary rollers (9) are sequentially arranged along the axial direction of the hollow input shaft (8) in a staggered manner;

or an inner annular convex-concave groove is formed in the inner side face of the hollow input shaft (8), an external thread (91) matched with the inner annular convex-concave groove of the hollow input shaft (8) is formed in each planetary roller (9), and the plurality of planetary rollers (9) are sequentially arranged in a staggered mode along the axial direction of the hollow input shaft (8);

the two expansion rings (27) are respectively positioned on the outer sides of two end faces of the planet carrier, each expansion ring (27) is formed by connecting N outer rings (271) with inward openings and N inner rings (272) with outward openings in a staggered head-to-tail mode, the end parts of N planet shafts (10) are respectively clamped in the N inner rings (272) of the expansion rings (27), and the planet rollers (9) can rotate on the planet carrier; the minimum diameter of a circle where the centers of the N inner rings (272) of each expansion ring (27) are located is larger than the minimum diameter of a circle where the N planet shafts (10) are located;

the output shaft (7) is arranged on the front end surface of the planet carrier, and the front end of the output shaft is supported by the shell and extends out of the shell.

7. An electrically operated brake device with easy friction rolling and clearance compensation according to claim 6, wherein:

n planet shafts (10) of the N planet roller assemblies are uniformly distributed on the planet carrier along the circumferential direction;

every planet roller (9) are provided with hollow input shaft (8) internal thread (81) complex outer annular tongue and groove, and a plurality of planet rollers (9) are along hollow input shaft (8) axial dislocation set in proper order, specifically are: each planetary roller (9) is provided with an outer annular convex-concave groove matched with the internal thread (81) of the hollow input shaft (8), the axial distance between every two adjacent planetary rollers (9) along the hollow input shaft (8) is 1/N of the pitch of the internal thread (81) of the hollow input shaft (8), and N is the number of the planetary roller assemblies;

every planet roller (9) be provided with hollow input shaft (8) interior annular tongue and groove complex external screw thread (91), a plurality of planet rollers (9) along hollow input shaft (8) axial dislocation set in proper order specifically do: each planetary roller (9) is provided with an external thread (91) matched with an internal annular convex-concave groove of the hollow input shaft (8), the axial distance between every two adjacent planetary rollers (9) along the hollow input shaft (8) is 1/N of the pitch of the external thread (91) of the planetary roller (9), and N is the number of the planetary roller assemblies.

8. An electrically operated brake device susceptible to friction roll and lash compensation according to claim 7, wherein: the planet carrier is provided with N radial waist-shaped holes for installing N planet shafts (10) or N U-shaped open slots which are radially opened on the outer side surface of the planet carrier;

the cross section of the output shaft (7) is a circular or non-circular surface; or the hollow input shaft (8) is provided with a limit groove, and the output shaft (7) is provided with a limit bulge or a limit convex rib which can axially slide in the limit groove; or the output shaft (7) is provided with a limit groove, and the hollow input shaft (8) is provided with a limit bulge or a limit convex rib which can axially slide in the limit groove.

9. An electrically operated brake device susceptible to friction roll and lash compensation according to claim 8, wherein: the planet carrier is of an I-shaped structure and comprises a front planet carrier body (72), a rear planet carrier body (71) and a connecting rod arranged between the middle part of the front planet carrier body (72) and the middle part of the rear planet carrier body (71); a plurality of planetary rollers (9) are arranged on the outer periphery of the connecting rod;

or the planet carrier is of a squirrel-cage structure and comprises a front planet carrier body (72), a rear planet carrier body (71) and a squirrel-cage sleeve (73) arranged between the front planet carrier body (72) and the rear planet carrier body (71); the planetary rollers (9) are positioned in the squirrel-cage sleeve (73), and the planetary rollers (9) can be meshed with the internal thread (81) or the inner annular convex-concave groove of the hollow input shaft (8);

or the planet carrier is of an I-shaped squirrel cage structure and comprises a front planet carrier body (72), a rear planet carrier body (71), a squirrel cage type sleeve (73) arranged between the front planet carrier body (72) and the rear planet carrier body (71) and a connecting rod arranged between the middle of the front planet carrier body (72) and the middle of the rear planet carrier body (71), a plurality of planet rollers (9) are arranged on the periphery of the connecting rod and positioned in the squirrel cage type sleeve (73), and the planet rollers (9) can be meshed with the internal thread (81) of the hollow input shaft (8) or the inner annular convex-concave groove.

10. An electrically operated brake device susceptible to friction roll and lash compensation according to claim 9, wherein: each planet shaft (10) is provided with an automatic aligning mechanism, and the automatic aligning mechanism comprises a spherical aligning unit and a second thrust bearing (21), wherein the spherical aligning unit is sleeved on the planet shaft (10) and is positioned between the planet carrier and the planet roller (9);

the spherical aligning unit comprises a spherical seat (23) and a spherical lug (22) which are matched to form a spherical pair;

a bearing (26) is arranged between the planet shaft (10) and the planet roller (9);

the shell comprises a front end cover (1), a middle shell (2) and a rear cover (3) which are connected in sequence;

the hollow input shaft (8) is of a cylinder structure with an opening at the front end, and the front end of the hollow input shaft is movably arranged on the front end cover (1) in a sealing manner;

the front end cover (1) is provided with a through hole for the output shaft (7) to extend out, and a dynamic sealing structure is arranged between the front end cover (1) and the output shaft (7).

11. An electrically operated brake device susceptible to friction roll and lash compensation according to claim 10, wherein: the middle shell (2) is internally provided with a connecting plate (28) which divides the inner cavity of the shell into a front cavity and a rear cavity;

the driving motor (15) and the planetary roller force transmission mechanism are both positioned in the front cavity, a motor rotor (5) of the driving motor (15) is of a hollow structure, and a hollow input shaft (8) of the planetary roller force transmission mechanism is coaxially fixed in the motor rotor (5);

a magnet fixing shaft (82) supported on the connecting plate (28) is arranged in the middle of the rear end face of the hollow input shaft (8), and an induction magnet (11) is arranged at the rear end of the magnet fixing shaft (82);

a circuit board (14) is arranged in the rear cavity, and a magnetic induction element is arranged on the circuit board (14) and opposite to the induction magnet (11);

and a clutch lock locking mechanism is arranged on the outer side of the hollow input shaft (8) and used for realizing the separation and locking of the hollow input shaft (8).

Background

With the rapid development of automobile technology, especially the development of new energy automobiles and automatic driving, the traffic flow density is continuously increased and the speed is gradually increased, so that the requirements of people on the safety and reliability of automobiles are higher and higher, and whether an automobile braking system can quickly and effectively realize the braking intention of a driver in real time becomes a key problem influencing the road traffic safety.

The traditional hydraulic braking system mainly comprises a brake pedal, a brake master cylinder, a vacuum booster, a brake wheel cylinder, a brake and the like. When a driver steps on a brake pedal, under the boosting action of the vacuum booster, hydraulic oil is pressed from a brake master cylinder to a brake wheel cylinder through a hydraulic pipeline, acts on a brake caliper body or a brake shoe and is pressed to a brake disc or a brake drum, and vehicle braking is achieved. However, the hydraulic brake system has the defects of complex system, low reaction speed, large volume, high difficulty in arrangement and assembly of the whole vehicle, complex ABS electric control system, high manufacturing and maintenance cost and the like due to the fact that the braking force needs to pass through a vacuum booster, a hydraulic pipeline and the like.

The electronic mechanical brake system (EMB) not only overcomes the inherent defects of the hydraulic brake system, but also has the outstanding advantages of simple system, high brake response speed, high efficiency and the like. At present, an electromechanical braking system comprises a driving mechanism, a conversion mechanism and a braking force output element, wherein the conversion mechanism is matched with a nut through a lead screw, so that the rotary motion output by the driving mechanism is converted into the translational motion of the braking force output element, and then the service braking of a vehicle is realized. Because the screw rod is in threaded fit with the nut, the threads are easy to wear after the screw rod works for a period of time, so that the screw rod is easy to slip, rolling friction cannot be realized, and the braking process is influenced; because the screw rod and the nut have processing errors, the friction force of thread fit between the screw rod and the nut after assembly is insufficient, rolling friction is easily realized, the braking process is influenced, and the processing precision requirement of the screw rod and the nut is higher in order to ensure the friction force of thread fit between the screw rod and the nut; in addition, after the threads matched with the screw rod and the nut are worn, the gap between the screw rod and the nut is increased, and the working noise is increased.

Disclosure of Invention

The brake system aims to solve the problem that in the working process of the existing electronic mechanical brake system, the threads of a lead screw and a nut are easy to wear, so that the lead screw is easy to slip to influence the brake process; the screw rod and the nut are easy to realize rolling friction due to processing errors, and the processing precision requirement is high in order to ensure the rolling friction; the invention provides a planetary roller force transmission mechanism easy to rub and roll and easy to compensate clearance and an electric brake device.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

a planetary roller force transmission mechanism easy in friction rolling and clearance compensation is characterized in that:

the planetary gear set comprises a hollow input shaft, a planetary carrier, an output shaft, two expansion rings and N planetary roller assemblies, wherein N is an integer greater than 1; each planetary roller assembly comprises a planetary shaft and a planetary roller arranged on the planetary shaft;

the planet carrier is coaxially arranged in the hollow input shaft;

n planet shafts of the N planet roller assemblies are circumferentially arranged on the planet carrier, two end parts of the N planet shafts extend out of the planet carrier, and a radial gap exists between each planet shaft and the planet carrier and is used for gap compensation between the planet roller and the hollow input shaft;

the inner side surface of the hollow input shaft is provided with internal threads, and each planetary roller is provided with external threads matched with the internal threads of the hollow input shaft;

or the inner side surface of the hollow input shaft is provided with internal threads, each planetary roller is provided with an outer annular convex-concave groove matched with the internal threads of the hollow input shaft, and the plurality of planetary rollers are sequentially arranged in a staggered manner along the axial direction of the hollow input shaft;

or the inner side surface of the hollow input shaft is provided with an inner annular convex-concave groove, each planetary roller is provided with an external thread matched with the inner annular convex-concave groove of the hollow input shaft, and the plurality of planetary rollers are sequentially arranged along the axial direction of the hollow input shaft in a staggered manner;

the two expansion rings are respectively positioned on the outer sides of two end faces of the planet carrier, each expansion ring is formed by staggering, head and tail connecting N outer rings with inward openings and N inner rings with outward openings, the end parts of N planet shafts are respectively clamped in the N inner rings of the expansion rings, and the planet rollers can rotate on the planet carrier; the minimum diameter of the circle where the centers of the N inner rings of each expansion ring are located is larger than the minimum diameter of the circle where the N planet shafts are located;

the output shaft is arranged on the front end face of the planet carrier, and the front end of the output shaft extends out of the hollow input shaft.

Furthermore, N planet shafts of the N planet roller assemblies are uniformly distributed on the planet carrier along the circumferential direction;

every planet roller is provided with hollow input shaft internal thread complex outer annular tongue and groove, and a plurality of planet rollers along hollow input shaft axial dislocation set in proper order specifically do: each planetary roller is provided with an outer annular convex-concave groove matched with the hollow input shaft internal thread, the axial distance between every two adjacent planetary rollers along the hollow input shaft is 1/N of the pitch of the hollow input shaft internal thread, and N is the number of the planetary roller assemblies;

every planet roller is provided with hollow input shaft inner ring shape tongue and groove complex external screw thread, and a plurality of planet rollers are along hollow input shaft axial dislocation set in proper order, specifically do: each planetary roller is provided with an external thread matched with the annular convex-concave groove in the hollow input shaft, the axial distance between every two adjacent planetary rollers along the hollow input shaft is 1/N of the pitch of the external thread of the planetary roller, and N is the number of the planetary roller assemblies.

The minimum diameter of a circle where the centers of the N inner rings of each expansion ring are located is D1, the minimum diameter of a circle where the N planet shafts are located is D2, D1-D2, and the value of D meets the following requirements:

d is more than 0 and less than or equal to D3, and D3 is the deformation of the expansion ring.

Furthermore, the planet carrier is provided with N radial waist-shaped holes for installing N planet shafts or N U-shaped open slots which are radially opened on the outer side surface of the planet carrier;

the cross section of the output shaft is a circular or non-circular surface; or the hollow input shaft is provided with a limit groove, and the output shaft is provided with a limit bulge or a limit convex rib which can axially slide in the limit groove; or the output shaft is provided with a limit groove, and the hollow input shaft is provided with a limit bulge or a limit convex rib which can axially slide in the limit groove.

Furthermore, the planet carrier is of an I-shaped structure and comprises a front planet carrier body, a rear planet carrier body and a connecting rod arranged between the middle part of the front planet carrier body and the middle part of the rear planet carrier body; a plurality of planetary rollers are arranged on the periphery of the connecting rod;

or the planet carrier is of a squirrel-cage structure and comprises a front planet carrier body, a rear planet carrier body and a squirrel-cage sleeve arranged between the front planet carrier body and the rear planet carrier body; the planetary rollers are positioned in the squirrel-cage sleeve and can be meshed with the internal threads or the inner annular convex-concave grooves of the hollow input shaft;

or, the planet carrier is I-shaped squirrel cage structure, and it includes preceding planet carrier body, back planet carrier body, set up the squirrel cage sleeve pipe between preceding planet carrier body and the back planet carrier body and set up the connecting rod between preceding planet carrier body middle part and back planet carrier body middle part, and a plurality of planet rollers are arranged in the periphery of connecting rod, and are located the squirrel cage sleeve pipe, and the planet roller can mesh with the internal thread of hollow input shaft or inner ring shape tongue and groove.

Furthermore, each planet shaft is provided with an automatic aligning mechanism, and the automatic aligning mechanism comprises a spherical aligning unit and a second thrust bearing, wherein the spherical aligning unit is sleeved on the planet shaft and is positioned between the planet carrier and the planet roller;

the spherical aligning unit comprises a spherical seat and a spherical lug which are matched to form a spherical pair;

and a bearing is arranged between the planet shaft and the planet roller.

Meanwhile, the invention also provides an electric brake device easy for friction rolling and clearance compensation, which is characterized in that: comprises a shell, a driving motor and a planetary roller force transmission mechanism arranged in the shell;

the planetary roller force transmission mechanism comprises a hollow input shaft, a planet carrier, an output shaft, two expansion rings and N planetary roller assemblies, wherein N is an integer greater than 1; each planetary roller assembly comprises a planetary shaft and a planetary roller arranged on the planetary shaft;

the driving motor drives the hollow input shaft to rotate;

the planet carrier is coaxially arranged in the hollow input shaft;

n planet shafts of the N planet roller assemblies are circumferentially arranged on the planet carrier, two end parts of the N planet shafts extend out of the planet carrier, and a radial gap exists between each planet shaft and the planet carrier and is used for gap compensation between the planet roller and the hollow input shaft;

the inner side surface of the hollow input shaft is provided with internal threads, and each planetary roller is provided with external threads matched with the internal threads of the hollow input shaft; preferably, a plurality of planetary roller assemblies are uniformly distributed along the same circumference;

or the inner side surface of the hollow input shaft is provided with internal threads, each planetary roller is provided with an outer annular convex-concave groove matched with the internal threads of the hollow input shaft, and the plurality of planetary rollers are sequentially arranged in a staggered manner along the axial direction of the hollow input shaft; preferably, a plurality of planetary roller assemblies are uniformly distributed on the circumference, the axial distance between adjacent planetary rollers along the hollow input shaft is 1/N of the thread pitch of the internal thread of the hollow input shaft, and N is the number of the planetary roller assemblies;

or the inner side surface of the hollow input shaft is provided with an inner annular convex-concave groove, each planetary roller is provided with an external thread matched with the inner annular convex-concave groove of the hollow input shaft, and the plurality of planetary rollers are sequentially arranged along the axial direction of the hollow input shaft in a staggered manner; preferably, a plurality of planetary roller assemblies are uniformly distributed on the circumference, the axial distance between adjacent planetary rollers along the hollow input shaft is 1/N of the thread pitch of the external threads of the planetary rollers, and N is the number of the planetary roller assemblies;

the two expansion rings are respectively positioned on the outer sides of two end faces of the planet carrier, each expansion ring is formed by staggering, head and tail connecting N outer rings with inward openings and N inner rings with outward openings, the end parts of N planet shafts are respectively clamped in the N inner rings of the expansion rings, and the planet rollers can rotate on the planet carrier; the minimum diameter of the circle where the centers of the N inner rings of each expansion ring are located is larger than the minimum diameter of the circle where the N radial planet shafts are located;

the output shaft is arranged on the front end face of the planet carrier, and the front end of the output shaft is supported by the outer shell and extends out of the outer shell.

Furthermore, the planet carrier is provided with N radial waist-shaped holes for mounting N planet shafts or N U-shaped open slots with openings on the outer side surface of the planet carrier;

the cross section of the output shaft is a circular or non-circular surface; or the hollow input shaft is provided with a limit groove, and the output shaft is provided with a limit bulge or a limit convex rib which can axially slide in the limit groove; or the output shaft is provided with a limit groove, and the hollow input shaft is provided with a limit bulge or a limit convex rib which can axially slide in the limit groove.

Furthermore, the planet carrier is of an I-shaped structure and comprises a front planet carrier body, a rear planet carrier body and a connecting rod arranged between the middle part of the front planet carrier body and the middle part of the rear planet carrier body; a plurality of planetary rollers are arranged on the periphery of the connecting rod;

or the planet carrier is of a squirrel-cage structure and comprises a front planet carrier body, a rear planet carrier body and a squirrel-cage sleeve arranged between the front planet carrier body and the rear planet carrier body; the planetary rollers are positioned in the squirrel-cage sleeve and can be meshed with the internal threads or the inner annular convex-concave grooves of the hollow input shaft;

or, the planet carrier is I-shaped squirrel cage structure, and it includes preceding planet carrier body, back planet carrier body, set up the squirrel cage sleeve pipe between preceding planet carrier body and the back planet carrier body and set up the connecting rod between preceding planet carrier body middle part and back planet carrier body middle part, and a plurality of planet rollers are arranged in the periphery of connecting rod, and are located the squirrel cage sleeve pipe, and the planet roller can mesh with the internal thread of hollow input shaft or inner ring shape tongue and groove.

Furthermore, each planet shaft is provided with an automatic aligning mechanism, and the automatic aligning mechanism comprises a spherical aligning unit and a second thrust bearing, wherein the spherical aligning unit is sleeved on the planet shaft and is positioned between the planet carrier and the planet roller;

the spherical aligning unit comprises a spherical seat and a spherical lug which are matched to form a spherical pair;

and a bearing is arranged between the planet shaft and the planet roller.

Further, the shell comprises a front end cover, a middle shell and a rear cover which are connected in sequence;

the hollow input shaft is of a cylinder structure with an opening at the front end, and the front end of the hollow input shaft is movably arranged on the front end cover in a sealing manner;

the front end cover is provided with a through hole for the output shaft to extend out, and a dynamic sealing structure is arranged between the front end cover and the output shaft.

The dynamic sealing structure comprises a sliding sleeve and a sealing ring, the sliding sleeve is arranged in a through hole of the front end cover, and the sealing ring is arranged between the sliding sleeve and the output shaft and between the sliding sleeve and the front end cover;

the bearing is a radial bearing.

Furthermore, a connecting plate is arranged in the middle shell to divide the inner cavity of the shell into a front cavity and a rear cavity;

the driving motor and the planetary roller force transmission mechanism are both positioned in the front cavity, a motor rotor of the driving motor is of a hollow structure, and a hollow input shaft of the planetary roller force transmission mechanism is coaxially fixed in the motor rotor;

a magnet fixing shaft supported on the connecting plate is arranged in the middle of the rear end face of the hollow input shaft, and an induction magnet is arranged at the rear end of the magnet fixing shaft;

a circuit board is arranged in the rear cavity, and a magnetic induction element is arranged on the circuit board and opposite to the induction magnet;

and a clutch lock locking mechanism is arranged on the outer side of the hollow input shaft and used for realizing the separation and locking of the hollow input shaft.

Compared with the prior art, the invention has the advantages that:

1. the planet roller force transmission mechanism adopts the expansion ring to fix the planet shaft on the planet carrier, and the expansion ring is used for applying pressing force to the planet roller to prevent the abnormal abrasion of the meshing surface caused by the sliding of the planet roller on the meshing surface from influencing the transmission efficiency and the service life.

2. In the working process of the planetary roller force transmission mechanism, when the planetary roller and the threads on the hollow input shaft are worn, the expansion ring can expand the planetary shaft outwards to ensure that the external threads of the planetary roller and the internal threads of the hollow input shaft (or the external threads of the planetary roller and the internal annular convex groove of the hollow input shaft or the external annular convex groove of the planetary roller and the internal threads of the hollow input shaft) are completely meshed, so that the thread wear loss is supplemented, and the transmission efficiency is ensured; meanwhile, due to the action of the expansion ring, the requirements on the machining precision and the assembling precision of the planet shaft and the planet carrier are greatly reduced, so that the manufacturing cost is reduced; and the problem of noise caused by the increase of the clearance between the planetary roller and the hollow input shaft is also avoided.

3. The planetary roller force transmission mechanism adopts a planetary roller mechanism (a planetary frame and a plurality of planetary roller assemblies), can output larger braking force with a smaller structure, not only ensures that the device is convenient to install, but also ensures high-efficiency braking force output (high transmission efficiency, larger load bearing due to the fact that a contact line is in point contact with a ball), and the electric braking device has the characteristics of compact structure, large output braking force, convenience in installation and high reliability.

4. The motor rotor is designed into a hollow structure, the braking force transmission mechanism is arranged in the hollow part of the motor rotor, the limited space is fully utilized, and the size of the electric braking device is reduced.

5. The electric brake device can realize the power-off self-locking of the mechanism through the clutch lock locking mechanism to achieve the parking brake function, and integrates the functions of service brake, parking brake and the like.

6. The planet shaft is fixed on the planet carrier by the expansion ring, and the expansion ring can expand the planet shaft outwards to ensure the transmission efficiency, so that the electric brake device has lower requirements on the processing precision and the assembly precision of the planet roller mechanism (the planet carrier and the plurality of planet roller assemblies) and the hollow input shaft, the processing is simpler, and the cost is reduced.

Drawings

FIG. 1 is a schematic structural diagram of an electric brake apparatus for friction rolling and clearance compensation according to a first embodiment of the present invention;

FIG. 2a is a schematic perspective view of a planetary roller force transmission mechanism (not shown with a hollow input shaft) in an embodiment of the electric brake apparatus easy to friction roll and clearance compensation of the present invention;

FIG. 2b is a schematic perspective view of a planetary roller force transmission mechanism in an embodiment of the electric brake apparatus easy to friction roll and clearance compensation of the present invention (the hollow input shaft is not shown);

FIG. 3 is a schematic view of the structure of FIG. 2a in one direction;

FIG. 4 is a cross-sectional view of FIG. 2 a;

FIG. 5 is a schematic structural diagram of a clutch lock mechanism in an embodiment of the electric brake apparatus easy to perform friction rolling and clearance compensation according to the present invention;

FIG. 6 is a schematic structural diagram of an automatic centering mechanism in an embodiment of an electric brake apparatus with easy friction rolling and clearance compensation according to the present invention;

FIG. 7a is a schematic perspective view of a planetary roller force transmission mechanism in a second embodiment of the electric brake apparatus with easy friction rolling and clearance compensation of the present invention (the hollow input shaft is not shown);

FIG. 7b is a schematic view of the structure of FIG. 7a in one orientation;

FIG. 8 is a schematic structural diagram of an automatic centering mechanism in a third embodiment of the electric brake apparatus with easy friction rolling and clearance compensation according to the present invention;

FIG. 9 is a schematic structural diagram of an electric brake apparatus with easy friction rolling and clearance compensation according to a fifth embodiment of the present invention;

wherein the reference numbers are as follows:

1-front end cover, 2-middle shell, 3-back cover, 4-motor stator, 5-motor rotor, 6-first thrust bearing, 7-output shaft, 71-back planet carrier body, 72-front planet carrier body, 73-squirrel cage sleeve, 8-hollow input shaft, 81-internal thread, 82-magnet fixed shaft, 9-planet roller, 91-external thread, 10-planet shaft, 11-induction magnet, 12-sliding sleeve, 13-fixing screw, 14-circuit board, 15-driving motor, 16-electromagnetic brake, 17-locking fixed ring, 18-locking outer ring, 19-friction plate, 20-dynamic pressure plate, 21-second thrust bearing, 22-spherical lug, 23-spherical seat, 24-first adjusting shim, 25-second adjusting shim, 26-bearing, 27-expanding ring, 271-outer ring, 272-inner ring, 28-connecting plate, 29-speed reducer, 291-speed reducer housing.

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments.

Example one

As shown in fig. 1, an electric brake device with easy friction rolling and clearance compensation comprises a housing, and a driving motor 15, a planetary roller force transmission mechanism, a control unit and a clutch lock locking mechanism which are arranged in the housing.

The shell comprises a front end cover 1, a middle shell 2 and a rear cover 3 which are connected in sequence, wherein a connecting plate 28 is arranged in the middle shell 2 to divide the inner cavity of the shell into a front cavity and a rear cavity; the front end cover 1 is provided with a fixing screw 13, so that the electric brake device is integrally and fixedly connected with the wheel end of an external vehicle.

Driving motor 15 sets up in the front cavity, and driving motor 15 comprises motor stator 4 and electric motor rotor 5, and motor stator 4 is fixed on front end housing 1, and this embodiment designs electric motor rotor 5 for hollow structure, places motor rotor 5's hollow portion in the braking force transmission mechanism, make full use of finite space, has reduced electric brake device's volume.

The planetary roller force transmission mechanism comprises a hollow input shaft 8, a planet carrier, an output shaft 7, two expansion rings 27 and N planetary roller assemblies, wherein N is an integer larger than 1; the hollow input shaft 8 is coaxially arranged in the motor rotor 5, the outer wall of the hollow input shaft 8 is fixedly connected with the inner wall of the motor rotor 5, and two ends of the excircle side of the hollow input shaft 8 can be directly or indirectly fixed on the front end cover 1 through the first thrust bearing 6; the hollow input shaft 8 can be driven by the motor rotor 5 to rotate; the hollow input shaft 8 is of a cylinder structure with an opening at the front end, and the front end is movably arranged on the front end cover 1 in a sealing manner; the inner side surface of the hollow input shaft 8 is provided with an internal thread 81;

the planet carrier is coaxially arranged at the rear side in the hollow input shaft 8 in a clearance fit mode; the N planetary roller assemblies are circumferentially arranged on the planetary frame, and preferably a plurality of planetary roller assemblies are uniformly distributed along the same circumference;

each planetary roller assembly comprises a planetary shaft 10 arranged on a planetary carrier and planetary rollers 9 arranged on the planetary shaft 10, N planetary rollers 9 are respectively arranged on the planetary carrier through N planetary shafts 10, two end parts of each planetary shaft 10 extend out of the planetary carrier, and the outer circular surface of each planetary roller 9 is provided with an external thread 91 meshed with the internal thread 81 of the hollow input shaft 8; there is radial clearance between every planet axle 10 and the planet carrier for the clearance compensation of planet roller 9 and hollow input shaft 8, specifically, be provided with N radial waist shape hole that circumference was arranged on the planet carrier of this embodiment, N planet axles 10 set up respectively in N radial waist shape downtheholely, and planet axle 10 can be downthehole along the radial removal of planet carrier in radial waist shape.

As shown in fig. 3 and 4, the two expansion rings 27 are respectively located outside two end faces of the planet carrier, each expansion ring 27 is formed by staggering, end-to-end connection of N outer rings 271 with inward openings and N inner rings 272 with outward openings and matched with planet shafts, the end parts of the N planet shafts are respectively clamped in the N inner rings 272 of the expansion ring 27, and the planet rollers 9 can rotate on the planet carrier; in the embodiment, at least one bearing 26 is arranged between the planetary roller 9 and the planetary shaft 10, the bearing is a radial bearing, and the planetary shaft and the planetary carrier are fixed through an expansion ring 27, so that the planetary roller 9 can only rotate around the planetary shaft 10; in other embodiments, the planetary rollers 9 may be fixedly connected to the planetary shaft 10, and a bearing is disposed between the planetary shaft 10 and the inner ring 272 of the expansion ring 27, so that the planetary rollers 9 and the planetary shaft 10 rotate on the planet carrier.

To facilitate the engagement of the planet axle with the inner ring 272 of the expansion ring 27, an opening mechanism may be provided on the expansion ring 27. The minimum diameter of a circle where centers of the N inner rings 272 of each expansion ring 27 are located is greater than the minimum diameter of a circle where the N planet shafts are located, specifically, the minimum diameter of a circle where centers of the N inner rings 272 of each expansion ring 27 are located is D1, the minimum diameter of a circle where the N planet shafts 10 are located is D2, D is D1-D2, and the value of D meets the following requirements: d is more than 0 and less than or equal to D3, D3 is the deformation of the expansion ring 27, and the deformation determines the pressing force of the expansion ring 27 on the planetary rollers; typically D satisfies: d is more than 0 and less than or equal to 0.1 mm.

The output shaft 7 is arranged on the front end face of the planet carrier, the front end of the output shaft 7 extends out of the front end cover 1, in order to achieve translation of the output shaft 7, the cross section of the output shaft is designed to be a non-circular face in the embodiment, in other embodiments, an axial limiting groove can also be arranged on the hollow input shaft, a limiting bulge or a limiting convex rib capable of axially sliding in the limiting groove is arranged on the output shaft, or the axial limiting groove is arranged on the output shaft, and a limiting bulge or a limiting convex rib capable of axially sliding in the limiting groove is arranged on the hollow input shaft.

A dynamic sealing structure is arranged between the front end cover 1 and the output shaft 7, the dynamic sealing structure comprises a sliding sleeve 12 and a sealing ring, a through hole for the output shaft 7 to extend out is arranged on the front end cover 1, the sliding sleeve 12 is arranged in the through hole of the front end cover 1, the sealing ring is arranged between the sliding sleeve 12 and the output shaft 7 and between the sliding sleeve 12 and the front end cover 1, and the dynamic sealing structure is mainly used for sealing the front end cover 1 and guiding the output shaft 7; to enhance guidance, the sleeve 12 may be a metallic or non-metallic sleeve.

As shown in fig. 2a and 2b, the planet carrier of the present embodiment is a hollow structure, and comprises a front planet carrier body 72, a rear planet carrier body 71 and a squirrel cage sleeve 73 arranged between the front planet carrier body 72 and the rear planet carrier body 71, wherein the number of the planet roller assemblies is 4, 4 planet rollers 9 are positioned in the squirrel cage sleeve 73, and the planet rollers 9 can be meshed with an internal thread 81 on the inner side surface of the hollow input shaft 8; in order to improve the rigidity and stability of the connection of the planet carrier, a connecting rod is arranged between the middle part of the front planet carrier body 72 and the middle part of the rear planet carrier body 71, the front planet carrier body 72, the rear planet carrier body 71, the connecting rod, the squirrel cage sleeve 73 and the output shaft 7 are integrated, but the cross section of the output shaft is a non-circular surface, so that the planet roller 9 can only rotate but not revolve, the rotation of the hollow input shaft 8 only drives the planet carrier and the output shaft 7 to move in a forward and backward translational mode along the axial direction of the output shaft 7 through the helix angle on the inner wall, and the planet carrier and the output shaft 7 cannot move in a rotational mode. In other embodiments, the planet carrier may be an i-shaped structure including a front planet carrier body 72, a rear planet carrier body 71, and a connecting rod disposed between the middle portions of the front and rear planet carrier bodies 72 and 71, and the plurality of planet rollers 9 are uniformly distributed on the outer circumference of the connecting rod.

As shown in fig. 6, the planetary shaft 10 of the present embodiment is sleeved with an automatic aligning mechanism, the automatic aligning mechanism includes a spherical aligning unit and a second thrust bearing 21 which are sequentially arranged between the front end surface of the front planetary frame 72 and the front end surface of the planetary roller 9 from front to back, the spherical aligning unit includes a spherical seat 23 capable of moving obliquely and a spherical protrusion 22 capable of moving obliquely, which are matched to form a spherical pair, the spherical protrusion 22 is arranged adjacent to the second thrust bearing 21, and the spherical aligning unit is used for adjusting the planetary roller 9 and the planetary shaft 10 to be always on the same axis, so as to reduce the loss of force during the transmission process.

As shown in fig. 1, the control unit includes an induction magnet 11 and a circuit board 14, a magnet fixing shaft 82 supported on the connecting plate 28 is provided at the rear end of the hollow input shaft 8, and the induction magnet 11 is provided on the magnet fixing shaft 82; the circuit board 14 is arranged on the middle shell 2 and located in the rear cavity, a magnetic induction element is arranged on the circuit board 14 opposite to the induction magnet 11, the magnetic induction element can identify the strength of a radial N/S magnetic field of the induction magnet 11 in the movement process, and the circuit board 14 is used for analyzing and calculating the stroke of the translational movement of the output shaft 7 and performing real-time control.

As shown in fig. 5, a clutch lock locking mechanism is arranged at the outer side of the rear end of the hollow input shaft 8, the clutch lock locking mechanism mainly comprises an electromagnetic brake 16, a locking fixing ring 17, a locking outer ring 18, a friction plate 19 and a dynamic pressure plate 20, the electromagnetic brake 16 is fixed on the middle shell 2, one end of the dynamic pressure plate 20 is attached to or close to the electromagnetic brake 16, the other end of the dynamic pressure plate is attached to or close to the friction plate 19, a plurality of springs are arranged in the electromagnetic brake 16, one end of each spring is in contact with the electromagnetic brake 16, and the other end of each spring is in contact with the dynamic pressure plate 20; the other end of the friction plate 19 is attached to or close to the inner wall of the locking outer ring 18, the outer ring and the inner ring of the locking fixing ring 17 are provided with splines, the splines of the inner ring are meshed with the splines arranged on the outer wall of the hollow input shaft 8, the splines of the outer ring are meshed with the splines arranged on the inner ring of the friction plate 19, and the clutch lock locking mechanism can respectively realize the separation and the locking of the hollow input shaft 8 by electrifying or powering off the electromagnetic brake 16.

The braking action process of the electric braking device of the embodiment is as follows:

during the driving process, when a driver steps on a brake pedal, the driving motor 15 is started, the motor rotor 5 drives the hollow input shaft 8 to rotate, the hollow input shaft 8 rotates to drive the planetary rollers 9 to rotate, the cross section of the output shaft 7 is a non-circular surface, so that the planetary rollers 9 can only rotate around the planetary shafts 10, further, the planetary rollers 9 push the planetary carrier and the output shaft 7 to move forwards in a translation mode along the axis direction of the output shaft 7, and the force output piece at the front end of the output shaft 7 is fixedly connected with a vehicle brake piece, so that the driving braking of the vehicle is realized.

In the electric brake device, the planet shaft is fixed on the planet carrier by the expansion ring 27, and in the working process, when the threads on the planet roller and the hollow input shaft are worn, the expansion ring 27 can expand the planet shaft outwards, so that the complete meshing of the external threads of the planet roller and the internal threads of the hollow input shaft is ensured, the thread wear loss is supplemented, and the transmission efficiency is ensured; the problem of noise caused by the increase of the gap between the planetary roller and the hollow input shaft is also avoided, and the service life is prolonged.

Example two

The difference from the first embodiment is that: as shown in fig. 7a and 7b, N radial kidney-shaped holes formed in the planet carrier open to the outer side surface of the planet carrier, and N U-shaped open slots open to the outer side surface of the planet carrier are formed, so that the installation of the planetary roller assembly is facilitated.

EXAMPLE III

The difference from the first embodiment is that: as shown in fig. 8, each planetary roller 9 is provided with an outer annular convex-concave groove matched with the internal thread 81 of the hollow input shaft 8, each planetary shaft 10 is further sleeved with a first adjusting shim 24 and a second adjusting shim 25, the first adjusting shim 24 is positioned between the front planet carrier 72 and the spherical seat 23, the second adjusting shim 25 is positioned between the rear end surface of the planetary roller 9 and the rear planet carrier 71, the thicknesses of the first adjusting shim 24 and the second adjusting shim 25 are adjusted to ensure that the plurality of planet rollers 9 are sequentially arranged along the axial direction of the hollow input shaft 8 in a staggered mode, preferably the plurality of planet roller assemblies are uniformly distributed on the circumference, the difference between the adjacent planetary rollers 9 along the axial direction of the hollow input shaft 8 is 1/N of the thread pitch of the internal thread of the hollow input shaft, N is the number of the planetary roller assemblies, the threaded engagement of the plurality of planetary rollers 9 with the helix angle of the inner wall of the hollow input shaft 8 in the axial direction is realized, and the external annular convex-concave grooves of the planetary rollers 9 can be straight line or circular arc tooth shapes matched with the tooth shapes of the hollow input shaft 8. In other embodiments, the first and second shims 24 and 25 may be implemented using bosses provided on the carrier.

Example four

The difference from the third embodiment is that: an inner annular convex-concave groove is formed in the inner side face of the hollow input shaft 8, an external thread 91 matched with the inner annular convex-concave groove of the hollow input shaft 8 is arranged on each planetary roller 9, the thickness of the first adjusting gasket 24 and the thickness of the second adjusting gasket 25 are adjusted, so that the difference between adjacent planetary rollers along the axial direction of the hollow input shaft is 1/N of the pitch of the external thread of each planetary roller, and the external threads of the plurality of planetary rollers 9 are meshed with the inner annular convex-concave grooves of the inner wall of the hollow input shaft 8 in the axial direction.

EXAMPLE five

The difference from the first to the fourth embodiments is that: as shown in fig. 9, the driving motor 15 is located outside the housing, and the rear end of the hollow input shaft 8 of the braking force transmission mechanism extends out of the housing and is connected with the driving motor 15 through a speed reducer 29; the control unit is not shown in the figure, the rear end of the hollow input shaft 8 is provided with a magnet fixing shaft 82 supported on the reducer housing 291, and the induction magnet 11 of the control unit is arranged on the magnet fixing shaft 82; the circuit board 14 is arranged outside the shell, a magnetic induction element is arranged on the circuit board 14 opposite to the induction magnet 11, the magnetic induction element can identify the strength of a radial N/S magnetic field of the induction magnet 11 in the movement process, and the circuit board 14 analyzes and calculates the stroke of the translational movement of the output shaft 7 and controls the stroke in real time.

The above description is only for the preferred embodiment of the present invention and does not limit the technical solution of the present invention, and any modifications made by those skilled in the art based on the main technical idea of the present invention belong to the technical scope of the present invention.