1. A high-power suspension inertial energy feedback device for a cross-country vehicle is characterized by mainly comprising an upper lifting lug (1), an upper shell (2), a lead screw (3), a lead screw nut (4), a flywheel (6), a coupler (7), a bent shaft (8), a disc I (9), a connecting piece (10), a disc II (11), an output shaft (12), a power generation device and power storage device integrated box (13), a lower shell (14), a lower lifting lug (15), a disc I side hole (17), a ball bearing (19) and a connecting piece bottom through hole (20);

the upper lifting lug (1) is welded right above the upper shell (2) and hinged with an upper end point of the vibration isolation system, and the lower lifting lug (15) is welded right below the lower shell (14) and hinged with a lower end point of the vibration isolation system; the axis of the upper shell (2) is vertically arranged, the ball screw device is packaged, the screw (3) is meshed with the screw nut (4), the screw (3) penetrates through the center hole of the flywheel (6) and is connected with the bent shaft (8) through the coupler (7), and therefore the screw (3), the flywheel (6), the coupler (7) and the bent shaft (8) synchronously rotate; the bent shaft (8) is vertically arranged, the lower end of the bent shaft is inserted into the central hole of the disc I (9) and is in interference fit with the central hole of the disc I, and the bent shaft synchronously rotates; the axis of a disc I (9) is vertically installed, the axes of 3 connecting pieces (10) are vertically installed, the upper ends of the connecting pieces (10) are in interference fit with side holes (17) of the disc I respectively, the lower end of each connecting piece (10) is connected with a disc II (11), the axes of the discs II (11) are vertically installed and welded in a lower shell (14) to move synchronously; the axes of the 3 output shafts (12) are vertically arranged, the upper ends of the output shafts (12) are in interference fit with through holes (20) at the bottom of the connecting piece (10) respectively, the middle parts of the output shafts (12) are in interference fit with bearings (19), and the lower ends of the output shafts (12) are connected with a generator shaft in a power generation device and an electricity storage device integration box (13) respectively.

2. The high-power suspension inertia energy feedback device for the off-road vehicle as claimed in claim 1, wherein the number of the power generation device and the power storage device integration box (13) is 3, the power generation device and the power storage device integration box (13) are welded on the lower bottom surface inside the lower shell (14), and the axis of the lower shell (14) is vertically installed to encapsulate the energy feedback device, the power generation device and the power storage device.

3. The high-power suspension inertia energy feedback device for off-road vehicles according to claim 2, wherein in the power generation device and the power storage device integration box (13), the power generation device is a rotating motor, the rotating part of the power generation device is a rotor, and the fixed part of the power generation device is a stator.

4. The high-power suspension inertia energy feedback device for the off-road vehicle according to claim 1, wherein a central hole (16) and three side holes (17) are formed in the disc I (9), 3 disc II side holes (18) are formed in the disc II (11), a ball bearing (19) is installed in each disc II side hole (18), and the outer end of each ball bearing (19) is in interference fit with the disc II side holes (18).

5. The high-power suspension inertia energy-feedback device for off-road vehicle as claimed in claim 1, wherein the energy recovery power P of the device_eComprises the following steps:

wherein, U_eTerminal voltage, R, generated for a rotating electrical machine_eFor the equivalent internal resistance of each rotating machine, R is the external resistance of each circuit, I_eThe current in the closed loop is formed between the internal circuit and the external circuit of the rotating motor.

6. The high power suspension inertial energy feedback device for off-road vehicles according to claim 1, characterized in that the screw nut (4) is fixed at the lower end of the upper housing (2) via a screw nut mounting bolt (5).

7. The high-power suspension inertia energy feedback device for the off-road vehicle as claimed in claim 1, wherein the coupling (7) is in transition fit with the boss hole above the lower shell (14), so that relative movement is guaranteed, dust is effectively prevented, and service life of the device is prolonged.

Background

Suspension is one of the important components of an automobile. Conventional passive suspensions use shock absorbers to absorb shock in order to generate a damping force to reduce the vibration of the vehicle. However, the vibration absorber converts vibration energy into heat energy in a friction mode, and the heat energy is dissipated, so that energy waste is caused, and the high-performance and energy-saving requirements of vehicles are increasingly not met. Accordingly, in recent years, the automotive industry has conducted a great deal of research into regenerative suspension systems. If the energy dissipated by the energy feedback suspension with high recovery efficiency can be recycled, the energy dissipation problem of the traditional passive suspension can be effectively solved, and the energy utilization rate of the automobile is improved. Especially for the off-road vehicle with relatively large vibration amplitude of the suspension during running, more energy can be recovered by applying the energy-feedback suspension.

As an important component of the energy-feedback suspension, the research on the inerter has important significance to the development of the energy-feedback suspension. Most of traditional inertials are of a rack and pinion type, the friction force of the inertials is large, and the motion of the rack and pinion has adverse effect on the vibration of a suspension. For example, in the patent CN201110295740.9, a rack and pinion inerter device with variable inerter coefficient, the rack and pinion inerter device has high friction force and backlash problem between the gears and the contact between the gears, and when the gears switch the motion direction at high speed, the backlash between the gears will cause system lag or phase lag. In order to solve the defect, a ball screw type inerter is provided. The linear motion of the suspension is converted into the rotary motion of the screw rod, and the screw rod drives the flywheel to rotate, so that the inertia of the flywheel is encapsulated.

Most of the existing energy feedback devices applied to automobiles are gear-rack type energy feedback devices. For example, patent CN202011244114.2 discloses a rack and pinion type electromechanical inertia energy feeding device, which has low energy feeding efficiency and limited energy recovery due to the large energy loss caused by the friction between the rack and pinion. Therefore, it is a key and difficult point to improve the energy feedback output efficiency of the energy feedback device. Particularly, the suspension energy feedback device suitable for the off-road vehicle has less research at home and abroad at present, and the energy recovery effect of the device is not ideal.

Disclosure of Invention

On the basis of researching the low recovered energy of the traditional energy feedback device and the relevant power generation principle, the invention combines the ball screw device with the high-power energy feedback device and provides the suspension high-power inertial energy feedback device for the off-road vehicle. The invention recovers the energy in the suspension vibration process, realizes the high-power energy feedback of the device and improves the energy recovery efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme: a high-power suspension inertial energy feedback device for a cross-country vehicle mainly comprises an upper lifting lug (1), an upper shell (2), a screw rod (3), a screw rod nut (4), a flywheel (6), a coupler (7), a bent shaft (8), a disc I (9), connecting pieces (10), a disc II (11), an output shaft (12), a power generation device and power storage device integration box (13), a lower shell (14), a lower lifting lug (15), a disc I side hole (17), a ball bearing (19) and connecting piece bottom through holes (20) (each connecting piece is provided with a through hole at the bottom), wherein the upper lifting lug (1) is welded right above the upper shell (2) and hinged with an upper end point of a vibration isolation system, the lower lifting lug (15) is welded right below the lower shell (14) and hinged with a lower end point of the vibration isolation system, the axis of the upper shell (2) is vertically arranged, and the ball screw, the lead screw (3) is meshed with the lead screw nut (4), the lead screw (3) penetrates through a center hole of the flywheel (6) and is connected with the bent shaft (8) through the coupler (7), and therefore the lead screw (3), the flywheel (6), the coupler (7) and the bent shaft (8) rotate synchronously; the bent shaft (8) is vertically arranged, the lower end of the bent shaft is inserted into the central hole of the disc I (9) and is in interference fit with the central hole of the disc I, and the bent shaft synchronously rotates; the axis of a disc I (9) is vertically installed, the axes of 3 connecting pieces (10) are vertically installed, the upper ends of the connecting pieces (10) are in interference fit with side holes (17) of the disc I respectively, the lower end of each connecting piece (10) is connected with a disc II (11), the axes of the discs II (11) are vertically installed and welded in a lower shell (14) to move synchronously; the axes of the 3 output shafts (12) are vertically arranged, the upper ends of the output shafts (12) are in interference fit with through holes (20) at the bottom of the connecting piece (10) respectively, the middle parts of the output shafts (12) are in interference fit with bearings (19), and the lower ends of the output shafts (12) are connected with a generator shaft in a power generation device and an electricity storage device integration box (13) respectively.

Furthermore, the number of the power generation devices and the storage battery device integration boxes (13) is 3, the power generation devices and the storage battery device integration boxes (13) are welded on the lower bottom surface in the lower shell (14), the axis of the lower shell (14) is vertically installed, and the energy feeding devices, the power generation devices and the storage battery devices are packaged in the lower shell.

Further, in the power generation device and power storage device integration box (13), the power generation device is a rotating electric machine, the rotating member thereof is a rotor, and the fixed member thereof is a stator.

Furthermore, a center hole (16) and three side holes (17) are formed in the disc I (9), 3 disc II side holes (18) are formed in the disc II (11), a ball bearing (19) is installed in each disc II side hole (18), and the outer end of each ball bearing (19) is in interference fit with the disc II side holes (18).

Further, the energy recovery power P of the device_eComprises the following steps:

wherein, U_eTerminal voltage, R, generated for a rotating electrical machine_eFor the equivalent internal resistance of each rotating machine, R is the external resistance of each circuit, I_eThe current in the closed loop is formed between the internal circuit and the external circuit of the rotating motor.

Further, a screw nut (4) is fixed to the lower end of the upper case (2) via a screw nut mounting bolt (5).

Furthermore, the coupler (7) is in transition fit with the boss hole above the lower shell (14), relative movement is guaranteed, meanwhile, dust can be effectively prevented, and the service life of the device is prolonged.

The beneficial effect of adopting above-mentioned technical scheme is: compared with the traditional suspension frame energy feedback device, the high-power suspension frame inertial energy feedback device for the cross-country vehicle is additionally provided with the high-power conversion mechanism, so that the efficiency of the energy feedback device is greatly improved, and the energy recovered in the suspension frame vibration process is increased. The recovered energy can be used for the aspects of power supply of automobile components and the like, is favorable for reducing the energy consumption, and has wide market application prospect. In addition, the whole device is packaged, so that the device is convenient to install and the service life of the device is prolonged.

Drawings

The invention is further illustrated by the following figures and examples.

FIG. 1 is a schematic structural diagram of a high power suspension inertia energy feedback device for a cross-country vehicle according to the present invention;

FIG. 2 is a top view of the disc I9;

FIG. 3 is a full sectional view of disk II 11;

FIG. 4 is a front view of the connector 10;

fig. 5 is a front view of the output shaft 12.

Description of reference numerals:

1-upper lifting lug, 2-upper shell, 3-lead screw, 4-lead screw nut, 5-lead screw nut mounting bolt, 6-flywheel, 7-coupler, 8-bent shaft, 9-disc I, 10-connecting piece, 11-disc II, 12-output shaft, 13-power generation device and power storage device integrated box, 14-lower shell, 15-lower lifting lug, 16-disc I central hole, 17-disc I side hole, 18-disc II side hole, 19-ball bearing and 20-connecting piece bottom through hole.

Detailed Description

The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.

The core idea of the invention is as follows: firstly, converting linear motion of a suspension during vibration into rotary motion of a flywheel by using a ball screw device; the energy feedback efficiency is improved through the high-power conversion device; and finally, storing the energy by using a power generation device and an electric storage device.

The invention provides a high-power suspension inertial energy feedback device for a cross-country vehicle, which mainly comprises an upper lifting lug 1, an upper shell 2, a lead screw 3, a lead screw nut 4, a lead screw nut mounting bolt 5, a flywheel 6, a coupler 7, a bent shaft 8, a disc I9, a connecting piece 10, a disc II 11, an output shaft 12, a power generation device and power storage device integration box 13, a lower shell 14, a lower lifting lug 15, a disc I central hole 16, a disc I side hole 17, a disc II side hole 18, a ball bearing 19 and a connecting piece bottom through hole 20.

As shown in figure 1, the whole device is vertically arranged, and an upper lifting lug 1 is welded right above an upper shell 2 and hinged with an upper end point of a vibration isolation system. The upper housing 2 is arranged with its axis vertical, enclosing the ball screw device therein. The screw 3 is engaged with a screw nut 4. A screw nut 4 is fixed to the lower end of the upper case 2 via a screw nut mounting bolt 5. The screw rod 3 passes through a center hole of the flywheel 6 and is connected with the bent shaft 8 through the coupling 7. Therefore, the screw shaft 3, the flywheel 6, the coupling 7, and the bent shaft 8 rotate synchronously. The coupling 7 is in transition fit with a boss hole above the lower shell 14, relative movement is guaranteed, meanwhile, dust can be effectively prevented, and the service life of the device is prolonged. The bent shaft 8 is vertically arranged, and the lower end of the bent shaft is inserted into the central hole 16 of the disc I9, is in interference fit with the central hole and synchronously rotates. The disc I9 axis is mounted vertically. The axes of the 3 connecting pieces 10 are vertically arranged, and the upper ends of the 3 connecting pieces are in interference fit with the I9 side holes 17 of the disc respectively. The disc II 11 is vertically installed in the axis and welded inside the lower shell 14 to move synchronously. The axes of the 3 output shafts 12 are vertically arranged, the upper ends of the output shafts are respectively in interference fit with the through holes 20 at the bottom of the connecting piece 10, the middle parts of the output shafts are in interference fit with the bearings 19, and the lower ends of the output shafts are respectively connected with the generator shafts in the power generation device and the power storage device integration box 13. 3 power generation device and storage device integration boxes 13 are welded to the lower bottom surface inside the lower case 14. The axis of the lower shell 14 is vertically installed, and the energy feeding device, the power generation device and the power storage device are packaged in the lower shell. The lower lifting lug 15 is welded right below the lower shell 14 and is hinged with the lower endpoint of the vibration isolation system.

In the power generation device and power storage device integrated box 13, the power generation device is a rotating electric machine, a rotating member thereof is a rotor, and a fixed member thereof is a stator.

As shown in FIG. 2, the disc I9 has a central hole 16 and three side holes 17.

As shown in FIG. 3, the disk II 11 has 3 side holes 18, each of which is fitted with a ball bearing 19. The outer end of the ball bearing 19 is in interference fit with the side hole 18.

As shown in fig. 4, the upper ends of the 3 connecting members 10 are designed as stepped shafts, which can be conveniently positioned during installation, and the lower ends thereof are provided with through holes 20.

As shown in fig. 5, the output shaft 12 is designed as a stepped shaft, which is easy to position and define during installation. The uppermost shaft is inserted into the through hole 20 at the bottom of the connecting piece and is in interference fit with the connecting piece; the second section of shaft is in interference fit with the ball bearing 19; the third section shaft is used for positioning and limiting; the lowermost end is connected to a generator shaft in the power generation and storage device integration box 13.

The invention provides a high-power suspension inertia energy feedback device for a cross-country vehicle, which comprises the following working processes: when the automobile runs, the suspension vibrates up and down due to the excitation of an uneven road surface. The upper lifting lug 1 is hinged with the upper end point of the vibration isolation system, and the lower lifting lug 15 is hinged with the lower end point of the vibration isolation system. The suspension motion causes relative compression or stretching motion between the upper lifting lug 1 and the lower lifting lug 15, so that the screw nut 4 is driven to move up and down, and further the screw 3 and the flywheel 6 are driven to rotate. The screw rod 3 penetrates through a center hole of the flywheel 6 and is connected with the bent shaft 8 through the coupler 7, so that the screw rod 3 moves to drive the bent shaft 8 to move, and further the energy feedback device is driven to move. The bent shaft 8 performs a rotational movement around the main axis (the axis of the screw 3 is defined as the main axis of the device). Because the lower end of the bent shaft 8 is in interference fit with the disc I9 through the disc center hole 16, the bent shaft 8 moves to drive the disc I9 to rotate around the main axis. Because the upper ends of the three connecting pieces 10 are in interference fit with the disc I9 through the three side holes 17 of the disc I9, the disc I9 moves to drive the three connecting pieces 10 to rotate around the axes of the output shafts 12 connected with the lower ends of the three connecting pieces respectively. The disc II 11 is fixedly connected with the lower shell 14 and does not rotate, three side holes 18 are formed in the upper surface of the disc II, and bearings 19 are respectively installed in the side holes 18. The three output shafts 12 are in interference fit with the corresponding connecting pieces 10 and are in transition fit with corresponding bearings 19 on the disc II 11. Therefore, the three connecting members 10 rotate to drive the three output shafts 12 to rotate around the respective axes. The three output shafts 12 are respectively connected with the generator shafts corresponding to the power generation device and the storage device integration box 13, so that the three generators are driven to generate power, and the electric energy is stored through the storage device and is applied to power supply of parts and components of an automobile and the like.

The working principle analysis of the ball screw device and the inertia energy feedback device shows that:

the parameter P is the lead of the ball screw 3, when the ball screw 3 generates a speed v due to up-down displacement, the rotation angular velocity is omega, J represents the total rotational inertia of the device when linear motion is converted into rotational motion, namely the total rotational inertia of the ball screw 3, the flywheel 6, the coupler 7, the bent shaft 8, the disc I9, the connecting piece 10, the disc II 11, the output shaft 12 and the ball bearing 19, T is the driving moment on the ball screw 3, and F is the acting force between the upper lifting lug 1 and the lower lifting lug 15 of the device.

Ideal linear kinetic equation of inerter by ball screw:

the expression of F obtained from the formulas (1), (2) and (3) is:

wherein b is the inertial volume coefficient of the device, and a is the relative acceleration between two ends of the device. The expression of the inertia-capacity coefficient b of the device obtained from the formula (4) is as follows:

from the equation (1), when the screw rod 3 generates the velocity v due to the vertical displacement, the rotation angular velocity ω is obtained, and from the working principle of the inertia energy-feeding device, the rotation angular velocities of the 3 output shafts 12 are all ω.

Let the electromotive force coefficients of the three rotating electrical machines all be K_eWhen 3 output shafts 12 are connected to the rotary electric machines and rotated at an angular velocity ω, an induced electromotive force V is generated by each rotary electric machine_eCan be expressed as:

V_e＝K_eω (6)

assuming that an external circuit of the rotating electric machine forms a closed circuit, the circuit terminal voltage U_eCan be expressed as:

U_e＝V_e＝K_eω (7)

let R_eFor the equivalent internal resistance of each rotating electrical machine, R is a circuit external resistor, and an internal circuit of the rotating electrical machine and an external circuit form a closed loop. I is_eIs the current in the circuit, the total output power P of the energy feedback device_eCan be expressed as:

here, assume a basic case where the lead P of the lead screw 3 is 5mm, the speed v generated by the vertical displacement is 2m/s, and the electromotive force coefficient K of the standard rotating electrical machine_e0.25Vs/rad, let R be_eBy equivalent internal resistance R of standard rotating electrical machines_eThe total output power P of the device can be obtained by the formulas (1), (6), (7) and (8)_eAnd the total output power P of the same kind of energy feedback device_eFor comparison, see table 1.

TABLE 1 comparison of the total output power of this device with a generic energy-feedback device

From the above table, the theoretical output power of the device is 3 times of that of a common energy feedback device, and high-power energy feedback can be realized.

The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.