1. A compact electronic parking mechanism, comprising:

the ratchet wheel comprises a plurality of locking grooves which are annularly distributed and are used for controlling the locking and unlocking of the gearbox;

a pawl including a pawl boss, a drive end;

a cam driving a pawl projection into a locking groove of the ratchet;

the spring piece comprises a locking pressing and attaching rod and a guiding pressing and attaching end;

the periphery of the rail plate assembly is provided with a plurality of protruding limiting teeth, and adjacent protruding limiting teeth are internally provided with gear grooves;

a main rotating shaft;

a return spring assembly;

the locking pressing and attaching rods are arranged towards the gear grooves and press and attach the corresponding gear grooves under the deformation of the spring pieces;

the main rotating shaft is externally connected with a power rotating part, the output end of the main rotating shaft is fixedly sleeved with the rail plate assembly, and the plane of the convex limiting teeth of the rail plate assembly is perpendicular to the main rotating shaft;

the guide pressing end of the spring piece is arranged towards the cam;

the driving rod end of the cam is fixedly connected with the rail plate assembly through a push rod;

the drive end of the pawl is provided with the return spring assembly, and the return spring assembly enables the pawl boss not to accidentally stay in the ratchet wheel when not pressed.

2. A compact electronic parking mechanism as defined in claim 1, wherein: the cam is characterized by further comprising a supporting sleeve, the supporting sleeve is fixedly arranged at the guide pressing and attaching end, and an inner groove of the supporting sleeve is arranged along the corresponding outer surface of the cam in a profiling mode.

3. A compact electronic parking mechanism as defined in claim 1, wherein: the push rod spring is sleeved on the push rod, the tail end of the push rod spring is fixedly connected with the rod end of the cam, and the push rod spring ensures that the cam is embedded in the supporting sleeve and the exposed end surface of the cam is pressed and attached to the driving pressing surface of the pawl boss.

4. A compact electronic parking mechanism as defined in claim 1, wherein: the vehicle body limiting device further comprises a limiting pin, the limiting pin is fixedly arranged at a corresponding position of the vehicle body, and the tail end of the driving end of the pawl is stopped by the limiting pin.

5. A compact electronic parking mechanism as defined in claim 1, wherein: the push rod is an L-shaped rod and comprises a first rod part fixedly connected with the rail plate assembly and a second rod part used for being connected with the cam, and the first rod part and the second rod part are arranged at an angle.

6. A compact electronic parking mechanism as defined in claim 1, wherein: and a plurality of convex limiting teeth are arranged on one side of the rail plate assembly, which only faces to the spring piece.

Background

Along with the development of automobile technology, the attention degree of people to vehicle safety increases gradually, and P shelves parking system can lock the vehicle when the vehicle stops or when speed is lower, prevents that the vehicle from taking place to roll over when the slope and causing the incident, promotes the security performance. The parking mechanism is a safety device for preventing the vehicle from sliding, can make the vehicle reliably and stop at a certain position without time limitation, and has obvious advantages. Therefore, vehicles equipped with the P-range parking system are increasing, and the application is becoming wider and more research is being conducted.

The electronic parking mechanism is a development trend of the current market, the existing electronic parking mechanism is relatively complex in mechanism, large in occupied size and not beneficial to arrangement of other parts, and therefore a relatively compact electronic parking mechanism is urgently needed to be developed.

Disclosure of Invention

In order to solve the problems, the invention provides a compact electronic parking mechanism which is compact in structure and convenient to install, reduces parking torque, and reduces impact on a push rod assembly and a rail plate assembly during unlocking.

A compact electronic parking mechanism, comprising:

the ratchet wheel comprises a plurality of locking grooves which are annularly distributed and are used for controlling the locking and unlocking of the gearbox;

a pawl including a pawl boss, a drive end;

a cam driving a pawl projection into a locking groove of the ratchet;

the spring piece comprises a locking pressing and attaching rod and a guiding pressing and attaching end;

the periphery of the rail plate assembly is provided with a plurality of protruding limiting teeth, and adjacent protruding limiting teeth are internally provided with gear grooves;

a main rotating shaft;

a return spring assembly;

the locking pressing and attaching rods are arranged towards the gear grooves and press and attach the corresponding gear grooves under the deformation of the spring pieces;

the main rotating shaft is externally connected with a power rotating part, the output end of the main rotating shaft is fixedly sleeved with the rail plate assembly, and the plane of the convex limiting teeth of the rail plate assembly is perpendicular to the main rotating shaft;

the guide pressing end of the spring piece is arranged towards the cam;

the driving rod end of the cam is fixedly connected with the rail plate assembly through a push rod;

the drive end of the pawl is provided with the return spring assembly, and the return spring assembly enables the pawl boss not to accidentally stay in the ratchet wheel when not pressed.

It is further characterized in that:

the cam support device further comprises a support sleeve, wherein the support sleeve is fixedly arranged at the guide pressing end, an inner groove of the support sleeve is arranged along the corresponding outer surface of the cam in a profiling mode, and the cam is ensured to be embedded in the inner groove and not to deform;

the ratchet wheel locking device is characterized by further comprising a push rod spring, wherein the push rod spring is sleeved on the push rod, the tail end of the push rod spring is fixedly connected with the rod end of the cam, the push rod spring ensures that the cam is embedded in the supporting sleeve, the exposed end face of the push rod spring presses and attaches a driving pressing surface of the pawl bulge, and the pawl bulge is ensured to be embedded and pressed and attached to a locking and attaching groove of the ratchet wheel;

the limiting pin is fixedly arranged at a corresponding position of the vehicle body, and the tail end of the driving end of the pawl is stopped by the limiting pin, so that the position of the pawl in a non-locking state is stable and reliable;

the push rod is an L-shaped rod and comprises a first rod part fixedly connected with the rail plate assembly and a second rod part used for connecting the cam, and the first rod part and the second rod part are arranged at an angle to ensure convenient and reliable connection;

the rail plate assembly is provided with a plurality of protruding limiting teeth only on one side facing the spring piece, so that the structure is compact and reliable.

After the technical scheme is adopted, the main rotating shaft rotates to drive the rail plate assembly to rotate, and further drives the protrusion limiting teeth to rotate, so that the cam moves towards or away from the pressing surface of the pawl protrusion, when the cam moves towards the pressing surface of the pawl protrusion, the pawl protrusion is driven to press downwards towards the locking groove of the ratchet wheel, so that the pawl protrusion is embedded in the locking groove, and meanwhile, the locking pressing rod presses downwards to attach the corresponding gear groove under the deformation of the spring piece to complete the parking action, the whole process only needs the main rotating shaft to rotate for a set angle, the spring piece and the pawl are both arranged on one side or in the thickness range of the thickness direction surface area of the ratchet wheel, and the main rotating shaft and the rail plate assembly are both arranged in the thickness range or the other side of the ratchet wheel, so that the whole structure is compact in arrangement, the installation is convenient, the parking torque is reduced, and due to the arrangement of, which reduces the impact on the push rod and rail plate assembly when unlocked.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic structural diagram of a second perspective view of the present invention;

the names corresponding to the sequence numbers in the figure are as follows:

the ratchet wheel 1, the locking attachment groove 101, the pawl 2, the pawl boss 21, the driving end 22, the profiling attachment pressing groove 23, the cam 3, the spring piece 4, the locking attachment pressing rod 41, the guide attachment pressing end 42, the rail plate assembly 5, the protrusion limiting tooth 51, the gear groove 52, the sleeve part 53, the main rotating shaft 6, the return spring assembly 7, the combination pin 8, the supporting sleeve 9, the inner groove 91, the push rod spring 10, the limiting pin 11, the L-shaped rod 12, the first rod part 121 and the second rod part 122.

Detailed Description

A compact electronic parking mechanism is shown in figures 1 and 2 and comprises a ratchet wheel 1, a pawl 2, a cam 3, a spring piece 4, a rail plate assembly 5, a main rotating shaft 6 and a return spring assembly 7,

the ratchet 1 comprises a plurality of locking grooves 101 which are annularly distributed and are used for controlling the locking and unlocking of the gearbox;

the pawl 2 comprises a pawl boss 21 and a driving end 22;

the cam 3 drives the pawl boss 21 to enter the locking groove 101 of the parking ratchet wheel 1;

the spring piece 4 comprises a locking pressure attaching rod 41 and a guide pressure attaching end 42, the guide pressure attaching end 42 of the spring piece 4 is fixedly arranged at the corresponding position of the vehicle body during specific implementation, and the locking pressure attaching rod 41 performs deformation;

a plurality of convex limiting teeth 51 are arranged on the periphery of the rail plate assembly 5, and gear grooves 52 are arranged in the adjacent convex limiting teeth 51;

the locking pressing and attaching rod 41 is arranged towards the gear grooves 52, and the locking pressing and attaching rod 41 is pressed and attached to the corresponding gear groove 52 under the deformation of the spring piece 4;

the main rotating shaft 6 is externally connected with a power rotating part, the output end of the main rotating shaft 6 is fixedly sleeved with the rail plate assembly 5, and the plane of the convex limiting teeth 51 of the rail plate assembly 5 is perpendicular to the main rotating shaft 6;

the guide pressing end 42 of the spring piece 4 is disposed toward the cam 3;

the driving rod end of the cam 3 is fixedly connected with a rail plate assembly 5 through a push rod;

the drive end of the pawl 2 is provided with a return spring assembly 7, the return spring assembly 7 enabling the pawl boss 21 to be free of pressure without accidentally parking into the ratchet wheel.

In specific implementation, see fig. 1 and fig. 2: the output end of the main rotating shaft 6 is fixedly sleeved with a sleeve part 53 of the rail plate assembly 5 through a combination pin 8; the cam support device further comprises a support sleeve 9, the support sleeve 9 is fixedly arranged at the guide pressing end 42, an inner groove 91 of the support sleeve 9 is arranged along the corresponding outer surface of the cam 3 in a copying mode, and the cam 3 is ensured to be embedded in the inner groove 91 and not to deform;

the upper surface of the pawl bulge 21 is provided with a copying attaching groove 23, the copying attaching groove 23 is arranged in a shape of copying the corresponding surface of the cam 3, and the locking attachment is stable and reliable after the pressure attachment is in place;

the ratchet wheel locking device further comprises a push rod spring 10, wherein the push rod spring 10 is sleeved on the push rod, the tail end of the push rod spring 10 is fixedly connected with the rod end of the cam 3, the push rod spring 10 ensures that the cam 3 is embedded in the supporting sleeve 9, the exposed end face of the push rod spring presses and attaches a driving pressing surface of the pawl bulge 21, and the pawl bulge 21 is ensured to be embedded in and pressed and attached to the locking and attaching groove 101 of the ratchet wheel 1;

the automobile ratchet wheel further comprises a limit pin 11, the limit pin 11 is fixedly arranged at a corresponding position of the automobile body, and the tail end of the driving end 22 of the pawl 2 is stopped by the limit pin 11, so that the position of the pawl 2 in a non-locking state is stable and reliable;

the push rod is an L-shaped rod 12, and comprises a first rod part 121 fixedly connected with the rail plate assembly 5 and a second rod part 122 used for connecting the push rod spring 10, and the first rod part 121 and the second rod part 122 are arranged at an angle to ensure convenient and reliable connection;

in specific implementation, the rail plate assembly 5 is provided with a plurality of protruding limiting teeth 51 only on one side facing the spring piece, so that the structure is compact and reliable.

The working principle is as follows: the main rotating shaft rotates to drive the rail plate assembly to rotate, and further drives the protrusion limiting teeth to rotate, so that the cam moves towards or away from the pressing attachment surface of the protrusion part of the pawl, when the cam moves towards the pressing surface of the pawl convex part, the pawl convex part is driven to press downwards towards the locking groove of the ratchet wheel, so that the pawl convex part is embedded in the locking groove, meanwhile, the locking pressing and attaching rod presses and attaches the corresponding gear groove under the deformation of the spring piece to complete the parking action, the whole process only needs the main rotating shaft to rotate for a set angle, the spring piece and the pawl are both positioned at one side of the thickness direction surface area of the ratchet wheel or in the thickness range, the main rotating shaft and the rail plate assembly are both arranged in the thickness range or the other side area of the ratchet wheel, so that the whole structure is compact in arrangement and convenient to install, and the parking torque is reduced, and due to the arrangement of the spring piece and the push rod spring, the impact on the push rod and the rail plate assembly during unlocking is reduced.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.