Height-adjustable double-wheel suspension and chassis using the same

Abstract

The application relates to a height-adjustable double-wheel suspension and a chassis applying the same, and belongs to the technical field of vehicle chassis, in particular to the technical field of balanced suspension. The double-wheel suspension is connected with two wheels by a multi-link mechanism according to a given wheelbase, the double-wheel bearing, the linkage of the suspension mechanism and the coordinated deformation of the double shock absorbers improve the wheel set load performance and the longitudinal impact resistance, and the ground adaptability and the driving speed of the vehicle are improved. During the driving of the vehicle, the wheel track and the wheelbase of the vehicle are unchanged, and the height of the vehicle chassis is dynamically adjustable. The application has the characteristics of light weight, good damping and guiding buffering effect and high stability, and is applied to the balanced suspension system of various multipurpose vehicles, thereby providing a new method for vehicle design.

Description

Technical Field

[0001] This invention relates to a height-adjustable dual-wheel suspension and a chassis using the suspension, belonging to the field of vehicle chassis technology, and particularly to balanced suspension control technology. Background Technology

[0002] The balanced suspension originated in three-axle and four-axle off-road trucks to ensure that all wheels have traction when driving on uneven roads, and to evenly distribute the vertical load between the middle and rear axle wheels. The working principle of the balanced suspension is to adjust the stiffness and damping of the suspension system, allowing the vehicle to better resist movements such as roll, pitch, and roll during driving. With its lightweight design, the balanced suspension is characterized by its light weight, good shock absorption and directional cushioning, and high stability, and is used in the balanced suspension systems of various multi-purpose vehicles. The main advantages of the balanced suspension are improved vehicle handling and safety performance, and enhanced stability at high speeds.

[0003] Compared to independent suspension, a solid axle is a transverse, dual-wheel balanced suspension with a wheelbase determined by the track width. The load is borne by both wheels, and through the elastic deformation of the torsion bar and the coordinated deformation of the damping systems on both sides, the vehicle can withstand greater lateral forces and resist the impact of instantaneous centrifugal forces during cornering. This results in good lateral stability, high strength, and a simple structure, improving the vehicle's road adaptability and cornering speed. When driving on inclines or declines, or during starting and braking, changes in the external forces in the vehicle's direction of travel and sudden changes in instantaneous impact forces affect the vehicle's longitudinal stability. A longitudinally mounted dual-wheel balanced suspension, with the front and rear wheels bearing the load and the dual damping systems deforming in coordination, allows the vehicle to withstand greater external forces in the direction of travel and resist instantaneous impact forces, resulting in good longitudinal stability and improved vehicle speed. Summary of the Invention

[0004] The purpose of this invention is to provide a height-adjustable dual-wheel suspension and a chassis using the suspension. The dual-wheel suspension connects two wheels according to a given wheelbase, with dual wheels bearing the load, the suspension mechanism working in tandem, and the dual shock absorbers coordinating deformation, thereby improving the wheel set load performance and longitudinal impact resistance, and thus enhancing the vehicle's ground adaptability and driving speed.

[0005] The technical solutions adopted to achieve the purpose of this invention include:

[0006] The height-adjustable dual-wheel suspension includes: two connecting rods (12) with one end rotatably connected to one end of two rocker arms (11) and two shock absorbers (13), with two connection points D and D'; two connecting rods (12) with one end rotatably connected to the body (10) and the longitudinal beam (14), with two connection points A and A'; four equal-length connecting rods (12) with the other end rotatably connected around the same axis, with connection point O; two equal-length rocker arms (11) with the other end rotatably connected to the body (10) and the longitudinal beam (14), with two connection points B and B'; two shock absorbers (13) are arranged in an X-shape, with the other end of two identical shock absorbers (13) rotatably connected to the body (10) and the longitudinal beam (14), with two connection points C and C' located on the extension line AB of the body and the extension line A'B' of the longitudinal beam, respectively; the rotation axes at each rotation connection point are parallel to each other and perpendicular to the vertical plane of the body. A motion chain with the same relative motion plane is formed, and the relative motion plane is parallel to the vertical plane of the vehicle body; two wheels (15) are rotatably connected at the front and rear ends of the longitudinal beam (14), respectively, with two connection points P and Q. The rotation axes of the two wheels are perpendicular to the vertical plane of the vehicle body. In the same relative motion plane, the geometric conditions are satisfied: DB=D'B'=AB=A'B', AO=DO=A'O=D'O=2DB, DC'=D'C=4DB, AC=A'C'=4DB; the motor (16) is connected in series with the reducer (17) and then fixedly installed on the vehicle body (10). The output shaft of the reducer (17) drives the rocker arm (11) to rotate relative to the vehicle body. The vehicle body (10) moves vertically relative to the longitudinal beam (14), and the height of the vehicle body from the ground changes. The angle between the rocker arm (11) and the vehicle body (10) is limited, and the height of the vehicle body from the ground is determined, forming a height-adjustable dual-wheel suspension.

[0007] Among them: the wheel (15) rotates relative to the longitudinal beam (14) and the vehicle moves. The two wheels bear the load and the double shock absorbers (13) deform in coordination. The rocker arm (11) is driven to rotate by the motor (16) in series with the reducer (17). The angle θ between the rocker arm (11) and the vehicle body changes, and the distance h=f(θ) between the vehicle body (10) and the longitudinal beam (14) changes, so as to realize the change of the height of the vehicle body from the ground. The wheelbase of the two wheels remains unchanged.

[0008] In the above-mentioned height-adjustable dual-wheel suspension, the motor (16) is a brake motor, and the reducer (17) is a planetary gear reducer or an RV reducer. When the power is on, the brake is released, the motor is powered, and the brake motor is connected in series with the planetary gear reducer or the RV reducer to drive the rocker arm to rotate, the height of the vehicle body from the ground changes, and when the height of the vehicle body increases, the vehicle's passability is improved. After the power is off, the motor stops being powered, the brake brakes the motor shaft, and the height of the vehicle body relative to the ground is locked.

[0009] In the above-mentioned height-adjustable dual-wheel suspension, the motor (16) is a permanent magnet synchronous motor, and the reducer (17) is a worm gear reducer with reverse self-locking function. When the motor applies power, the worm gear pair reduces the transmission, and the motor is connected in series with the worm gear reducer to drive the rocker arm to rotate. The height of the vehicle body from the ground changes. When the height of the vehicle body decreases, the stability of the vehicle at high speed is improved. When the motor stops applying power, the worm gear pair reverses the transmission and self-locks, and the height of the vehicle body relative to the ground is locked.

[0010] A vehicle chassis includes: two sets of height-adjustable dual-wheel suspensions with identical structure and performance parameters, arranged symmetrically on the left and right sides of the vehicle body's mid-vertical plane according to a given wheelbase, sharing the same body, with four wheels independently driven and differentially steered; the vehicle's wheelbase and track width remain unchanged, while the vehicle chassis height is dynamically adjustable; the four wheels bear the load, the suspension mechanism is linked, and the dual shock absorbers deform in coordination, resulting in good wheel load-bearing capacity and longitudinal impact resistance, thereby improving the vehicle's ground adaptability and driving speed.

[0011] The beneficial effects of this invention are that the proposed height-adjustable dual-wheel suspension and the chassis using the suspension improve the wheel load performance and longitudinal impact resistance through dual-wheel bearing, suspension mechanism linkage, and coordinated deformation of dual shock absorbers. The vehicle chassis height is dynamically adjustable to improve the vehicle's ground adaptability and driving speed. It is applied to the balance suspension system of various multi-purpose vehicles, providing a new method for vehicle design. Attached Figure Description

[0012] Figure 1 A simplified diagram of the height-adjustable dual-wheel suspension mechanism;

[0013] Figure 2 This is a schematic diagram of the principle of a height-adjustable dual-wheel suspension.

[0014] Figure 3 This is a schematic diagram illustrating the principle of dual-wheel suspension vehicle height adjustment.

[0015] Figure 4 This is a diagram showing the maximum height of the vehicle body with dual-wheel suspension.

[0016] Figure 5 This is a diagram showing the minimum height position of a vehicle with dual-wheel suspension.

[0017] Figure 6 Schematic diagram of coordinated deformation principle of dual-wheel suspension shock absorber;

[0018] Figure 7 Schematic diagram for configuring the rocker arm angle control of a worm gear pair;

[0019] Figure 8 This is a schematic diagram of a vehicle chassis assembly.

[0020] In the diagram: 10--body, 11--rocker arm, 12--connecting rod, 13--shock absorber, 14--longitudinal beam, 15--wheel, 16--motor, 17--reducer. Detailed Implementation

[0021] The embodiments of the present invention will now be described with reference to the accompanying drawings:

[0022] Figure 1 The diagram shows a simplified structure of a height-adjustable dual-wheel suspension. The height-adjustable dual-wheel suspension includes: two connecting rods (12) with one end rotatably connected to one end of two rocker arms (11) and two shock absorbers (13), respectively, at two connection points D and D'; two connecting rods (12) with one end rotatably connected to the vehicle body (10) and the longitudinal beam (14), respectively, at two connection points A and A'; four equal-length connecting rods (12) with the other end rotatably connected around the same axis, at connection point O; two equal-length rocker arms (11) with the other end rotatably connected to the vehicle body (10) and the longitudinal beam (14), respectively, at two connection points B and B'; two shock absorbers (13) are arranged in an X-shape, with the other end of two identical shock absorbers (13) rotatably connected to the vehicle body (10) and the longitudinal beam (14), respectively, at two connection points C and C', respectively, located on the extension line AB of the vehicle body and the extension line A'B' of the longitudinal beam; the rotation axes at each rotation connection point are parallel to each other and perpendicular to the vehicle body. The vertical plane forms a motion chain with the same relative motion plane, which is parallel to the vertical plane of the vehicle body; the two wheels (15) are rotatably connected at the front and rear ends of the longitudinal beam (14) respectively, with two connection points P and Q. The rotation axes of the two wheels are perpendicular to the vertical plane of the vehicle body. In the same relative motion plane, the geometric conditions are satisfied: DB=D'B'=AB=A'B', AO=DO=A'O=D'O=2DB, DC'=D'C=4DB, AC=A'C'=4DB; the motor (16) is connected in series with the reducer (17) and then fixedly installed on the vehicle body (10). The output shaft of the reducer (17) drives the rocker arm (11) to rotate relative to the vehicle body. The vehicle body (10) moves vertically relative to the longitudinal beam (14), and the height of the vehicle body from the ground changes. The angle θ between the rocker arm (11) and the vehicle body (10) is limited, θ=∠ABD. The height of the vehicle body from the ground is determined, forming a height-adjustable dual-wheel suspension, such as Figure 2 As shown.

[0023] Among them: the rocker arm (11) is driven to rotate by the motor (16) in series with the reducer (17), the angle θ between the rocker arm (11) and the vehicle body changes, and the distance h=f(θ) between the vehicle body (10) and the longitudinal beam (14) changes, such as Figure 3 As shown, this achieves the change in the vehicle's height above the ground; when θ=θ1, the distance h between the vehicle and the longitudinal beam is h=h1, which is the maximum height of the vehicle. Figure 4 As shown; when θ=θ2, the distance h between the vehicle body and the longitudinal beam is h2, which is the minimum height of the vehicle body, as shown. Figure 5As shown; the wheel (15) rotates relative to the longitudinal beam (14) and the vehicle travels. During the vehicle travels, the two wheels bear the load and the double shock absorbers (13) deform in coordination. The wheelbase of the two wheels remains unchanged.

[0024] Figure 6 The diagram shown illustrates the coordinated deformation principle of the dual-wheel suspension shock absorbers. The principle of coordinated deformation of the dual shock absorbers is as follows: During vehicle movement, given the angle θ between the rocker arm and the vehicle body, and the height H of the vehicle body above the ground, assuming the force on the road surface changes at the Q-axis wheel and the wheel rises by ΔH, the shock absorber C'D deforms by Δa. At this time, the longitudinal beam rotates around the P-axis and moves with the vehicle. The quadrilateral kinematic chain OA'B'D' transmits the motion, and the other shock absorber D'C deforms by Δc. The deformations Δa and Δc of the two shock absorbers together balance the external forces, resulting in coordinated deformation of the dual shock absorbers and longitudinal stability of the vehicle.

[0025] Figure 2 In the schematic diagram of the height-adjustable dual-wheel suspension shown, the configuration of the rocker arm angle is controlled by the brake motor. In the above-mentioned height-adjustable dual-wheel suspension, the motor (16) is a brake motor, and the reducer (17) is a planetary gear reducer or an RV reducer. When the power is on, the brake is released, the motor is powered, and the brake motor drives the rocker arm to rotate in series with the planetary gear reducer or the RV reducer. The angle θ between the rocker arm and the vehicle body changes, and the height of the vehicle body from the ground changes. When the height of the vehicle body increases, the vehicle's passability is improved. After the power is off, the motor stops being powered, the brake brakes the motor shaft, the angle θ between the rocker arm and the vehicle body is locked, and the height of the vehicle body from the ground is locked.

[0026] Figure 7 The diagram shows the configuration principle of the worm gear pair controlling the rocker arm angle. In the above-mentioned height-adjustable dual-wheel suspension, the motor (16) is a permanent magnet synchronous motor, and the reducer (17) is a worm gear reducer with reverse self-locking function. When the lead angle of the worm is less than the equivalent friction angle between the meshing teeth of the worm wheel, the worm gear pair reverses and self-locks, that is, the worm can only drive the worm wheel to rotate, and the worm wheel cannot drive the worm. When the motor applies power, the worm gear pair reduces the speed, and the motor is connected in series with the worm gear reducer to drive the rocker arm to rotate. The angle θ between the rocker arm and the vehicle body changes, and the height of the vehicle body from the ground changes. When the height of the vehicle body decreases, the stability of the vehicle at high speed is improved. When the motor stops applying power, the worm gear pair reverses and self-locks, the angle θ between the rocker arm and the vehicle body is locked, and the height of the vehicle body relative to the ground is locked.

[0027] Figure 8The diagram shows a schematic of a vehicle chassis. The chassis includes: two sets of height-adjustable dual-wheel suspensions with identical structures and performance parameters, arranged symmetrically on the left and right sides of the vehicle's mid-plane according to a given wheelbase, sharing the same body. The four wheels are independently driven by hub motors and feature differential steering. The vehicle's wheelbase and track width remain constant, while the chassis height is dynamically adjustable. The suspension mechanisms are linked, and the dual shock absorbers deform in coordination, resulting in good wheel load-bearing capacity and longitudinal impact resistance, thereby improving the vehicle's ground adaptability and driving speed.

Claims

1. A height-adjustable dual-wheel suspension, characterized in that, include: Two connecting rods are rotatably connected at one end to one end of each of the two rocker arms and two shock absorbers, at connection points D and D'. Two other connecting rods are rotatably connected at one end to the vehicle body and the longitudinal beam, at connection points A and A'. The other ends of four equal-length connecting rods are rotatably connected around the same axis, at connection point O. The other ends of two equal-length rocker arms are rotatably connected to the vehicle body and the longitudinal beam, at connection points B and B'. Two shock absorbers are arranged in an X-shape, with the other ends of two identical shock absorbers rotatably connected to the vehicle body and the longitudinal beam, at connection points C and C' located on the extension lines of the vehicle body's AB line and the longitudinal beam's A'B' line, respectively. The rotation axes at each rotatable connection point are parallel to each other and perpendicular to the vehicle body's vertical plane, forming a kinematic chain with the same relative motion plane. The relative motion plane is parallel to the vertical plane of the vehicle body; the two wheels are rotatably connected at the front and rear ends of the longitudinal beam respectively, and the rotation axes of the two wheels are perpendicular to the vertical plane of the vehicle body. In the same relative motion plane, the geometric conditions are satisfied: DB=D'B'=AB=A'B', AO=DO=A'O=D'O=2DB, DC'=D'C=4DB, AC=A'C'=4DB; the motor is fixedly installed on the vehicle body after being connected in series with the reducer. The output shaft of the reducer drives the rocker arm to rotate relative to the vehicle body. The vehicle body moves vertically relative to the longitudinal beam, and the height of the vehicle body above the ground changes. The angle between the rocker arm and the vehicle body is limited, and the height of the vehicle body above the ground is determined. The wheels rotate relative to the longitudinal beam, the vehicle moves, the two wheels bear the load, and the double shock absorbers deform in coordination.

2. The height-adjustable dual-wheel suspension according to claim 1, characterized in that, The motor is a brake motor, and the reducer is a planetary gear reducer or an RV reducer. When the power is on, the brake is released, the motor is powered, and the brake motor drives the rocker arm to rotate in series with the planetary gear reducer or RV reducer, changing the height of the vehicle body from the ground. When the power is off, the motor stops powering, the brake brakes the motor shaft, and the height of the vehicle body relative to the ground is locked.

3. The height-adjustable dual-wheel suspension according to claim 1, characterized in that, The motor is a permanent magnet synchronous motor, and the reducer is a worm gear reducer with reverse self-locking function. When the motor is powered, the worm gear pair reduces the speed, and the motor is connected in series with the worm gear reducer to drive the rocker arm to rotate, changing the height of the vehicle body from the ground. When the motor stops powering, the worm gear pair reverses the speed and locks itself, locking the height of the vehicle body relative to the ground.

4. A vehicle chassis, characterized in that, include: The height-adjustable dual-wheel suspension according to claim 1.

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