High-integration double-wishbone independent suspension system

Abstract

The invention relates to vehicle equipment, in particular to a high-integration double-wishbone independent suspension system which comprises an upper wishbone, a lower wishbone, a wheel set, an electric drive axle main speed reducer shell and a damping device. One end of the upper cross arm and one end of the lower cross arm are both connected to the electric drive axle main speed reducer shell, the other end of the upper cross arm and the other end of the lower cross arm are both connected to the wheel set, and the upper cross arm and the lower cross arm are suitable for rotating in the X-axis direction relative to the electric drive axle main speed reducer shell. The upper cross arm and the lower cross arm are suitable for rotating in the Z-axis direction relative to the wheel set, the upper cross arm is located above the lower cross arm, and the damping device is connected between the frame and the lower cross arm. According to the high-integration double-wishbone independent suspension system, the integration degree and the modularization degree are higher, axles can be increased or decreased according to different loading loads, and the chassis can be flexibly expanded according to needs.

Description

Technical Field

[0001] The invention relates to vehicle equipment, in particular to a highly integrated double wishbone independent suspension system. Background Art

[0002] The chassis of a multi-axle heavy-loaded electric drive vehicle has a complex system composition. Compared with the mechanical drive chassis, it has added power batteries, drive motors, generators, high and low voltage distribution boxes, vehicle and system-level controllers, etc. The system has many components and the connections between them are complex, which puts higher requirements on the layout of the vehicle. Correspondingly, the multi-axle heavy-loaded electric drive chassis will have higher requirements on the degree of integration and modularization of the vehicle design.

[0003] The suspension system is the intermediate link between the wheels and the frame, and the structure of the suspension system has a great impact on the optimized layout and driving performance of the vehicle. The existing chassis suspension system has a low degree of integration and modularization and cannot adapt to multi-axle heavy-load electric drive vehicle equipment. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a highly integrated double wishbone independent suspension system that is more integrated and modularized, can add or reduce axles according to different upper loads, and can flexibly expand the chassis according to needs.

[0005] In order to solve the above technical problems, this application provides the following technical solutions:

[0006] The present invention discloses a highly integrated double wishbone independent suspension system, comprising an upper wishbone, a lower wishbone, a wheel set, an electric drive axle main reducer housing, and a shock absorbing device. The electric drive axle main reducer housing is connected to the bottom of a vehicle frame, one end of the upper wishbone and the lower wishbone are both connected to the electric drive axle main reducer housing, and the other ends of the upper wishbone and the lower wishbone are both connected to the wheel set, the upper wishbone and the lower wishbone are suitable for rotating relative to the electric drive axle main reducer housing along the X-axis direction, the upper wishbone and the lower wishbone are suitable for rotating relative to the wheel set along the Z-axis direction, the upper wishbone is located above the lower wishbone, and the shock absorbing device is connected between the vehicle frame and the lower wishbone.

[0007] Furthermore, the upper cross arm is connected to the electric drive axle main reducer housing through an upper cross arm pin shaft, the lower cross arm is Y-shaped, and one end of the lower cross arm connected to the electric drive axle main reducer housing is provided with two connecting ends, and the two connecting ends are respectively connected to the electric drive axle main reducer housing through a first lower cross arm pin shaft and a second lower cross arm pin shaft.

[0008] Furthermore, the upper cross arm and the lower cross arm are respectively connected to the wheel set via a ball joint.

[0009] Furthermore, the shock absorbing device is a gas spring, the upper end of which is connected to the vehicle frame via an upper spring pin, and the lower end of which is connected to the lower cross arm via a lower spring pin.

[0010] Furthermore, a first connecting shaft hole is provided at one end of the upper cross arm connected to the electric drive axle main reducer housing, a first bimetallic bearing is provided in the first connecting shaft hole, a second connecting shaft hole and a third connecting shaft hole are provided at the two connecting ends of the lower cross arm, a second bimetallic bearing and a third bimetallic bearing are provided in the second connecting shaft hole and the third connecting shaft hole, respectively, the upper cross arm pin passes through the electric drive axle main reducer housing and the first bimetallic bearing, the first lower cross arm pin passes through the electric drive axle main reducer housing and the second bimetallic bearing, and the second lower cross arm pin passes through the electric drive axle main reducer housing and the third bimetallic bearing.

[0011] Furthermore, lubricating oil passages are respectively provided in the upper cross arm pin shaft, the first lower cross arm pin shaft, and the second lower cross arm pin shaft to lubricate the first bimetallic bearing, the second bimetallic bearing, and the third bimetallic bearing.

[0012] Furthermore, it also includes a wheel upper jump limit device and a wheel lower jump limit device, wherein the wheel upper jump limit device is connected to a position on the side of the frame corresponding to the middle of the upper cross arm, and the wheel lower jump limit device is connected to a side of the electric drive axle main reducer housing, the wheel upper jump limit device is located above the upper cross arm, and the wheel lower jump limit device is located below the upper cross arm.

[0013] Furthermore, the wheel jump limiting device includes a first elastic block and a first mounting frame, the first mounting frame is provided with a first mounting groove, the first elastic block is arranged in the first mounting groove, the surface of the first elastic block protrudes outside the first mounting groove, the first mounting frame is connected to the frame, and when the wheel jumps up and the upper cross arm hits the first elastic block, the wheel jump limiting is achieved.

[0014] Furthermore, the wheel bottom jump limiting device includes a swing arm, a second elastic block, and a second mounting frame, one end of the swing arm is connected to the upper cross arm and moves synchronously with the upper cross arm, the second mounting frame is provided with a second mounting groove, the second elastic block is arranged in the second mounting groove, the surface of the second elastic block protrudes out of the second mounting groove, and the second mounting frame is connected to the main reducer housing of the electric drive axle, and when the wheel jumps down, the upper cross arm drives the swing arm to jump down, and when the other end of the swing arm hits the second elastic block, the wheel bottom jump limiting is achieved.

[0015] Furthermore, a first rectangular tooth is arranged on the end surface of the upper cross arm connected to the housing of the electric drive axle main reducer, and the swing arm is meshed with the upper cross arm through the rectangular tooth.

[0016] Compared with the prior art, the highly integrated double wishbone independent suspension system of the present invention has at least the following beneficial effects:

[0017] The present invention discloses a highly integrated double wishbone independent suspension system. As the upper wishbone and the lower wishbone form a double wishbone structure, the suspension can better meet the requirements of heavy load and off-road use. One end of the upper wishbone and the lower wishbone are both connected to the housing of the main reducer of the electric drive axle, and the housing of the main reducer of the electric drive axle is connected to the bottom of the frame, so that the whole suspension system is integrated into one, and the degree of integration and modularization is improved. In addition, as one end of the upper wishbone and the lower wishbone are directly connected to the housing of the main reducer of the electric drive axle, the connection structure of the suspension is simplified, and the connection structure is maintenance-free and the connection reliability is enhanced. Moreover, the axles can be increased or reduced according to different upper loads, and the chassis can be flexibly expanded according to needs, thereby improving the layout flexibility of the chassis.

[0018] The highly integrated double wishbone independent suspension system of the present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a highly integrated double wishbone independent suspension system of the present invention;

[0020] Figure 2 It is a schematic structural diagram of an upper wishbone in a highly integrated double wishbone independent suspension system of the present invention;

[0021] Figure 3 It is a schematic structural diagram of the lower wishbone in the highly integrated double wishbone independent suspension system of the present invention. DETAILED DESCRIPTION

[0022] like Figure 1 , Figure 2 , Figure 3As shown, a highly integrated double wishbone independent suspension system of the present invention comprises an upper wishbone 11, a lower wishbone 12, a wheel set 13, an electric drive axle main reducer housing 14, and a shock absorbing device. The electric drive axle main reducer housing 14 is connected to the bottom of a vehicle frame 21. The vehicle coordinate system is forward as the positive direction of the X-axis, upward as the positive direction of the Z-axis, and the left is determined as the positive direction of the Y-axis according to the right-hand rule. One end of the upper wishbone 11 and the lower wishbone 12 are both connected to the electric drive axle main reducer housing 14, and the other end of the upper wishbone 11 and the lower wishbone 12 are both connected to the wheel set 13. The upper wishbone 11 and the lower wishbone 12 are suitable for rotating relative to the electric drive axle main reducer housing 14 along the X-axis direction to realize the up and down jumping of the wheel along the X-axis direction. The upper wishbone 11 and the lower wishbone 12 are suitable for rotating relative to the wheel set 13 along the Z-axis direction to realize the steering movement of the wheel around the Z-axis. The upper wishbone 11 is located above the lower wishbone 12, and the shock absorbing device is connected between the vehicle frame 21 and the lower wishbone 12. The upper cross arm 11 and the lower cross arm 12 form a guide mechanism of the suspension. When the suspension guide mechanism is designed in a three-dimensional structure, the optimal load transfer path is found through topological optimization, so that the lightweight design of the structure is achieved while satisfying the structural strength. A highly integrated double wishbone independent suspension system of the present invention comprises an upper cross arm 11 and a lower cross arm 12 to form a double wishbone structure, so that the suspension can better meet the use requirements of heavy load and off-road. One end of the upper cross arm 11 and the lower cross arm 12 are both connected to the electric drive axle main reducer housing 14, and the electric drive axle main reducer housing 14 is connected to the bottom of the frame 21, so that the entire suspension system is integrated into one, and the degree of integration and modularization is improved. Moreover, since one end of the upper cross arm 11 and the lower cross arm 12 are directly connected to the electric drive axle main reducer housing 14, the connection structure of the suspension is simplified, and the connection structure is maintenance-free and the connection reliability is enhanced. The axle can also be increased or decreased according to different upper loads, and the chassis can be flexibly expanded as needed, thereby improving the flexibility of chassis layout.

[0023] Optionally, the upper cross arm 11 is connected to the electric drive axle main reducer housing 14 through the upper cross arm pin shaft, the lower cross arm 12 is Y-shaped, and one end of the lower cross arm 12 connected to the electric drive axle main reducer housing 14 is provided with two connecting ends, and the two connecting ends of the lower cross arm 12 are respectively connected to the electric drive axle main reducer housing 14 through the first lower cross arm pin shaft and the second lower cross arm pin shaft. The upper cross arm 11 and the lower cross arm 12 are both connected to the electric drive axle main reducer housing 14 through the pin shaft, which facilitates the up and down jumping of the wheel along the X-axis direction.

[0024] Optionally, the upper cross arm 11 and the lower cross arm 12 are respectively connected to the wheel set 13 through a ball joint to facilitate the rotation of the wheel.

[0025] Optionally, the shock absorbing device is an oil-gas spring 15, the upper end of the oil-gas spring 15 is connected to the frame 21 through the spring upper pin, and the lower end is connected to the lower cross arm 12 through the spring lower pin. The oil-gas spring 15 has a nonlinear stiffness characteristic. When the wheel bounce stroke is small, the suspension stiffness is small, so that the vehicle can obtain good smoothness when driving on a good road; when the wheel bounce stroke is large, the suspension stiffness is large, which can ensure the handling stability of the vehicle on a bad road. In addition, by filling and discharging oil in the oil-gas spring, the vehicle body height can be adjusted to ensure the vehicle's passability on complex roads. Specifically, an oil-gas spring connecting hole 121 is provided on the lower cross arm 12, and a bimetallic bearing is provided in the oil-gas spring connecting hole 121. The lower spring pin passes through the bimetallic bearing in the oil-gas spring connecting hole 121 and the lower end of the oil-gas spring 15 to connect the oil-gas spring 15 to the lower cross arm 12, and a lubricating oil channel is provided in the lower spring pin to provide lubrication for the bimetallic bearing and the lower spring pin.

[0026] Optionally, the end of the upper cross arm 11 connected to the electric drive axle main reducer housing 14 is provided with a first connecting shaft hole 111, and a first bimetallic bearing is provided in the first connecting shaft hole 111. The two connecting ends of the lower cross arm 12 are respectively provided with a second connecting shaft hole 122 and a third connecting shaft hole 123, and a second bimetallic bearing and a third bimetallic bearing are respectively provided in the second connecting shaft hole 122 and the third connecting shaft hole 123. The upper cross arm pin passes through the electric drive axle main reducer housing 14 and the first bimetallic bearing, the first lower cross arm pin passes through the electric drive axle main reducer housing 14 and the second bimetallic bearing, and the second lower cross arm pin passes through the electric drive axle main reducer housing 14 and the third bimetallic bearing. The upper cross arm 11 and the lower cross arm 12 are respectively connected to the electric drive axle main reducer housing 14 through bearings and pins, so as to reduce the wear between the upper cross arm 11, the lower cross arm 12 and the electric drive axle main reducer housing 14 under complex road conditions and large impact loads.

[0027] Optionally, lubricating oil channels are respectively provided in the upper cross arm pin shaft, the first lower cross arm pin shaft, and the second lower cross arm pin shaft to provide lubrication for the first bimetallic bearing, the second bimetallic bearing, and the third bimetallic bearing, thereby further reducing the wear between the upper cross arm 11, the lower cross arm 12 and the electric drive axle main reducer housing 14, so that the highly integrated double wishbone independent suspension system of the present invention can better adapt to complex road conditions with large impact loads and has stronger off-road performance.

[0028] Optionally, it also includes a wheel upper jump limit device 22 and a wheel lower jump limit device 23. The wheel upper jump limit device 22 is connected to the side of the frame 21 at a position corresponding to the middle of the upper cross arm 11, and the wheel lower jump limit device 23 is connected to the side of the electric drive axle main reducer housing 14. The wheel lower jump limit device 23 is located below the upper cross arm 11. Under bad road conditions, the wheel jumps up and down, and the upper cross arm 11 and the lower cross arm 12 swing up and down. The wheel upper jump limit device 22 limits the limit position of the wheel jump to prevent the suspension from being punctured under bad road conditions. The wheel lower jump limit device 23 limits the limit position of the wheel jump to prevent the oil-gas spring 15 from being stretched to the longest and damaged when the wheel jumps down. Through the motion verification of the wheel jump limit position and the steering limit position, it is ensured that the components do not interfere with each other under extreme working conditions. According to the suspension hard points and the positional relationship with other systems, three-dimensional assembly is performed in UG, and then kinematic pairs are set at the joints of each component in the UG-Motion module according to the motion relationship. Vertical motion excitation is added at the wheel center and steering excitation is added at the kingpin to realize motion interference verification of the up and down jumping motion process and the steering process.

[0029] Optionally, the wheel jump limit device 22 includes a first elastic block and a first mounting frame, the first mounting frame is provided with a first mounting groove, the first elastic block is provided in the first mounting groove, the surface of the first elastic block protrudes outside the first mounting groove, the first mounting frame is connected to the frame 21, and when the wheel jumps onto the cross arm 11 and hits the first elastic block, the wheel jump limit is achieved. Specifically, the first elastic block is made of vulcanized rubber, and the load of the first elastic block at the extreme position of the jump on the bad road is obtained through Adams vehicle dynamics simulation, and the stiffness of the first elastic block is determined accordingly.

[0030] Optionally, the wheel bottom jump limiting device 23 includes a swing arm, a second elastic block, and a second mounting frame. One end of the swing arm is connected to the upper cross arm 11 and moves synchronously with the upper cross arm 11. A second mounting groove is provided on the second mounting frame. The second elastic block is provided in the second mounting groove. The surface of the second elastic block protrudes out of the second mounting groove. The second mounting frame is connected to the electric drive axle main reducer housing 14. When the wheel jumps down on the upper cross arm 11, the swing arm jumps down. When the other end of the swing arm hits the second elastic block, the wheel bottom jump limiting is achieved.

[0031] Optionally, a first rectangular tooth 112 is provided on the end face of the upper cross arm 11 connected to the electric drive axle main reducer housing 14, and a second rectangular tooth matching the first rectangular tooth 112 is provided on the swing arm. The swing arm and the upper cross arm 11 are connected by meshing of the rectangular teeth, so that the swing arm and the upper cross arm 11 move synchronously.

[0032] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A highly integrated double wishbone independent suspension system, characterized in that: The invention comprises an upper cross arm (11), a lower cross arm (12), a wheel set (13), an electric drive axle main reducer housing (14), and a shock absorbing device. The electric drive axle main reducer housing (14) is connected to the bottom of a vehicle frame (21). One end of the upper cross arm (11) and the lower cross arm (12) are both connected to the electric drive axle main reducer housing (14). The other ends of the upper cross arm (11) and the lower cross arm (12) are both connected to the wheel set (13). The upper cross arm (11) and the lower cross arm (12) are suitable for rotating relative to the electric drive axle main reducer housing (14) along the X-axis direction. The upper cross arm (11) and the lower cross arm (12) are suitable for rotating relative to the wheel set (13) along the Z-axis direction. The upper cross arm (11) is located above the lower cross arm (12). The shock absorbing device is connected between the vehicle frame (21) and the lower cross arm (12).

2. The highly integrated double wishbone independent suspension system according to claim 1, characterized in that: The upper cross arm (11) is connected to the electric drive axle main reducer housing (14) via an upper cross arm pin shaft, the lower cross arm (12) is Y-shaped, and one end of the lower cross arm (12) connected to the electric drive axle main reducer housing (14) is provided with two connecting ends, and the two connecting ends are respectively connected to the electric drive axle main reducer housing (14) via a first lower cross arm pin shaft and a second lower cross arm pin shaft.

3. The highly integrated double wishbone independent suspension system according to claim 2, characterized in that: The upper cross arm (11) and the lower cross arm (12) are respectively connected to the wheel set (13) via a ball joint.

4. The highly integrated double wishbone independent suspension system according to claim 3, characterized in that: The shock absorbing device is a gas spring (15), the upper end of the gas spring (15) is connected to the vehicle frame (21) via an upper spring pin, and the lower end is connected to the lower cross arm (12) via a lower spring pin.

5. The highly integrated double wishbone independent suspension system according to claim 4, characterized in that: The end of the upper cross arm (11) connected to the electric drive axle main reducer housing (14) is provided with a first connecting shaft hole (111), and a first bimetallic bearing is provided in the first connecting shaft hole (111); the two connecting ends of the lower cross arm (12) are respectively provided with a second connecting shaft hole (222) and a third connecting shaft hole (223), and a second bimetallic bearing and a third bimetallic bearing are respectively provided in the second connecting shaft hole (222) and the third connecting shaft hole (223); the upper cross arm pin shaft passes through the electric drive axle main reducer housing (14) and the first bimetallic bearing, the first lower cross arm pin shaft passes through the electric drive axle main reducer housing (14) and the second bimetallic bearing, and the second lower cross arm pin shaft passes through the electric drive axle main reducer housing (14) and the third bimetallic bearing.

6. The highly integrated double wishbone independent suspension system according to claim 5, characterized in that: Lubricating oil passages are respectively arranged in the upper cross arm pin shaft, the first lower cross arm pin shaft, and the second lower cross arm pin shaft to lubricate the first bimetallic bearing, the second bimetallic bearing, and the third bimetallic bearing.

7. The highly integrated double wishbone independent suspension system according to claim 6, characterized in that: The invention also comprises a wheel upper jump limit device (22) and a wheel lower jump limit device (23), wherein the wheel upper jump limit device (22) is connected to a position on the side of the frame (21) corresponding to the middle of the upper cross arm (11), and the wheel lower jump limit device (23) is connected to a side of the electric drive axle main reducer housing (14), the wheel upper jump limit device (22) is located above the upper cross arm (11), and the wheel lower jump limit device (23) is located below the upper cross arm (11).

8. The highly integrated double wishbone independent suspension system according to claim 7, characterized in that: The wheel jump limit device (22) comprises a first elastic block and a first mounting frame, the first mounting frame is provided with a first mounting groove, the first elastic block is arranged in the first mounting groove, the surface of the first elastic block protrudes outside the first mounting groove, the first mounting frame is connected to the vehicle frame (21), and when the wheel jumps up and the upper cross arm (11) hits the first elastic block, the wheel jump limit is achieved.

9. The highly integrated double wishbone independent suspension system according to claim 8, characterized in that: The wheel bottom jump limiting device (23) comprises a swing arm, a second elastic block, and a second mounting frame. One end of the swing arm is connected to the upper cross arm (11) and moves synchronously with the upper cross arm (11). The second mounting frame is provided with a second mounting groove. The second elastic block is arranged in the second mounting groove. The surface of the second elastic block protrudes outside the second mounting groove. The second mounting frame is connected to the main reducer housing (14) of the electric drive axle. When the wheel bottom jumps, the upper cross arm (11) drives the swing arm to bottom jump. When the other end of the swing arm hits the second elastic block, the wheel bottom jump limiting is achieved.

10. The highly integrated double wishbone independent suspension system according to claim 9, characterized in that: A first rectangular tooth (112) is provided on an end surface of the upper cross arm (11) connected to the electric drive axle main reducer housing (14), and the swing arm is connected to the upper cross arm (11) through the meshing of the rectangular teeth.

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