Height-adjustable double-wheel suspension and chassis applying same

Abstract

The invention relates to a height-adjustable double-wheel suspension and a chassis applying the same, belongs to the technical field of vehicle chassis, and particularly relates to the technical field of balanced suspensions. The double-wheel suspension is connected with two wheels through a multi-connecting-rod mechanism according to the given axle distance, double-wheel bearing and suspension mechanism linkage are achieved, double dampers deform in a coordinated mode, the wheel set load performance and the longitudinal impact resistance are improved, and the ground adaptability and the running speed of a vehicle are improved. In the running process of the vehicle, the wheel track and the axle base of the vehicle are unchanged, and the height of the vehicle chassis is dynamically adjustable; the damping device has the advantages of being light in self weight, good in damping and guiding buffering effect and high in stability, is applied to balanced suspension systems of various multipurpose automobiles, and provides a new method for vehicle design.

Description

Technical Field

[0001] The invention relates to a height-adjustable double-wheel suspension and a chassis using the suspension, belonging to the technical field of vehicle chassis, and particularly to a balanced suspension control technology. Background Art

[0002] The balance suspension originated from three-axle and four-axle off-road trucks, so that when the car is driving on uneven roads, each wheel has adhesion and the vertical load of the middle and rear axle wheels is evenly distributed; the working principle of the balance suspension is to adjust the stiffness and damping of the suspension system so that the vehicle can better resist the movement of roll, pitch and roll during driving; after the lightweight design of the balance suspension, it has the characteristics of light weight, good shock absorption and guiding buffering effect, and high stability, and is used in the balance suspension system of various multi-purpose vehicles. The main advantage of the balance suspension is to improve the vehicle's handling performance and safety performance, so as to improve the stability of the vehicle when driving at high speed.

[0003] Compared with independent suspension, integral bridge is a transverse double-wheel balanced suspension determined by wheelbase, with the wheels on both sides bearing loads, and through the elastic deformation movement of torsion bar and coordinated deformation of shock absorbing systems on both sides, the vehicle can withstand greater lateral external forces and resist instantaneous centrifugal force impact in curves, and the vehicle has good lateral stability, good strength and simple structure, which can improve the vehicle's road adaptability and curve driving speed; when the vehicle is driving on uphill or downhill roads or starting and braking conditions, changes in external forces in the driving direction of the vehicle and sudden changes in instantaneous impact forces in the forward direction will affect the longitudinal stability of the vehicle, and the longitudinal double-wheel balanced suspension determined by the wheelbase, with front and rear wheels bearing loads and coordinated deformation of double shock absorbing systems, can enable the vehicle to withstand greater external forces in the driving direction and resist instantaneous impact forces in the forward direction, and the vehicle has good longitudinal stability, which is conducive to increasing the vehicle's driving speed. Summary of the invention

[0004] The purpose of the present invention is to provide a height-adjustable two-wheel suspension and a chassis using the suspension. The two-wheel suspension connects two wheels according to a given wheelbase, and the two wheels are loaded, the suspension mechanism is linked, and the two shock absorbers are deformed in a coordinated manner, thereby improving the wheel group load performance and longitudinal impact resistance, so as to improve the vehicle's ground adaptability and driving speed.

[0005] The technical solutions adopted to achieve the purpose of the present invention include: A height-adjustable two-wheel suspension comprises: two connecting rods (12) having one end rotatably connected to two rocker arms (11) and one end of two shock absorbers (13), two connection points D and D', two other connecting rods (12) having one end rotatably connected to a vehicle body (10) and a longitudinal beam (14), two connection points A and A', the other ends of four equal-length connecting rods (12) being rotatably connected around the same axis, a connection point O, the other ends of two equal-length rocker arms (11) being rotatably connected to a vehicle body (10) and a longitudinal beam (14), two connection points B and B', two shock absorbers (13) being arranged in an X-shaped staggered manner, the other ends of two identical shock absorbers (13) being rotatably connected to a vehicle body (10) and a longitudinal beam (14), two connection points C and C' being located respectively on an extension line AB of the vehicle body and an extension line A'B' of the longitudinal beam, the rotation axes at the rotation connection points being parallel to each other and perpendicular to the mid-vertical plane of the vehicle body, A kinematic chain having the same relative motion plane is formed, and the relative motion plane is parallel to the mid-vertical plane of the vehicle body; two wheels (15) are rotatably connected at the front and rear ends of the longitudinal beam (14), and the two connection points P and Q, respectively, and the rotation axes of the two wheels are perpendicular to the mid-vertical plane of the vehicle body, and 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 mounted 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), 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, thereby forming a height-adjustable two-wheel suspension.

[0006] The wheel (15) rotates relative to the longitudinal beam (14), the vehicle travels, the two wheels are loaded, and the dual shock absorbers (13) are deformed in coordination; the motor (16) is connected in series with the reducer (17) to drive the rocker arm (11) to rotate, the angle θ between the rocker arm (11) and the vehicle body changes, the distance h=f(θ) between the vehicle body (10) and the longitudinal beam (14) changes, and the height of the vehicle body from the ground changes, while the wheelbase of the two wheels remains unchanged.

[0007] In the above-mentioned height-adjustable two-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 and the motor is energized, and the brake motor is connected in series with the planetary gear reducer or the RV reducer to drive the rocker arm to rotate, so that the height of the vehicle body from the ground changes. When the height of the vehicle body increases, the vehicle's passing performance improves; after the power is off, the motor stops energizing, the brake brakes the motor shaft, and the height of the vehicle body relative to the ground is locked.

[0008] In the height-adjustable two-wheel suspension, the motor (16) is a permanent magnet synchronous motor, and the reducer (17) is a worm reducer with a reverse self-locking function; when the motor is energized, the worm pair is driven in a reduced speed, and the motor is connected in series with the worm reducer to drive the rocker arm to rotate, so that the height of the vehicle body from the ground changes. When the height of the vehicle body decreases, the high-speed driving stability of the vehicle is improved; when the motor stops energizing, the worm pair is reversely driven and self-locked, and the height of the vehicle body relative to the ground is locked.

[0009] A vehicle chassis comprises: two sets of height-adjustable double-wheel suspensions with the same structure and performance parameters are arranged symmetrically on the left and right sides of the vehicle body mid-vertical plane according to a given wheelbase, share the same vehicle body, and four wheels are independently driven and differentially steered; the vehicle wheelbase and wheelbase remain unchanged, and the height of the vehicle chassis is dynamically adjustable; four wheels are loaded, the suspension mechanism is linked, and the double shock absorbers are deformed in a coordinated manner, and the wheel group has good load-bearing capacity and longitudinal impact resistance, so as to improve the ground adaptability and driving speed of the vehicle.

[0010] The beneficial effects of the present invention are that the proposed height-adjustable two-wheel suspension and the chassis using the suspension improve the wheel set load performance and longitudinal impact resistance through double-wheel load-bearing, suspension mechanism linkage, and coordinated deformation of double shock absorbers. The vehicle chassis height is dynamically adjustable to improve the vehicle's ground adaptability and driving speed. The balanced suspension system applied to various multi-purpose vehicles provides a new method for vehicle design. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a simplified diagram of the mechanism of the height-adjustable two-wheel suspension; Figure 2 It is the schematic diagram of the height-adjustable two-wheel suspension; Figure 3 It is the schematic diagram of the height adjustment of the dual-wheel suspension vehicle body; Figure 4 It is the maximum height position diagram of the two-wheel suspension vehicle body; Figure 5 It is the minimum height position diagram of the two-wheel suspension vehicle body; Figure 6 It is the principle diagram of coordinated deformation of the dual-wheel suspension shock absorber; Figure 7 Schematic diagram of the configuration of the rocker arm angle controlled by the worm gear pair; Figure 8 The present invention is a schematic diagram of a vehicle chassis composition; In the figure: 10 - body, 11 - rocker arm, 12 - connecting rod, 13 - shock absorber, 14 - longitudinal beam, 15 - wheel, 16 - motor, 17 - reducer. DETAILED DESCRIPTION

[0012] The embodiments of the present invention are described below according to the accompanying drawings: Figure 1The diagram shows a schematic diagram of a height-adjustable two-wheel suspension. The height-adjustable two-wheel suspension comprises: one end of two connecting rods (12) is rotatably connected to one end of two rocker arms (11) and two shock absorbers (13), two connection points D and D', one end of the other two connecting rods (12) is rotatably connected to the vehicle body (10) and the longitudinal beam (14), two connection points A and A', the other ends of the four equal-length connecting rods (12) are rotatably connected around the same axis, connection point O, the other ends of the two equal-length rocker arms (11) are rotatably connected to the vehicle body (10) and the longitudinal beam (14), two connection points B and B', two shock absorbers (13) are arranged in an X-shaped staggered manner, the other ends of two identical shock absorbers (13) are rotatably connected to the vehicle body (10) and the longitudinal beam (14), two connection points C and C' are respectively located on the AB extension line of the vehicle body and the A'B' extension line of the longitudinal beam, and the rotation axes at each rotation connection point are parallel to each other and perpendicular to the vehicle body. The two wheels (15) are connected to the longitudinal beam (14) at the front and rear ends, respectively, and the two connection points P and Q are perpendicular to the longitudinal beam (14). The rotation axes of the two wheels are perpendicular to the longitudinal beam (14) and in the same relative motion plane, and 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 angles θ between the rocker arm (11) and the vehicle body (10) are limited to θ = ∠ABD, and the height of the vehicle body from the ground is determined, forming a height-adjustable two-wheel suspension. Figure 2 shown.

[0013] Wherein: the motor (16) is connected in series with the reducer (17) to drive the rocker arm (11) to rotate, 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, the height of the vehicle body from the ground changes; when θ=θ1, the distance between the vehicle body and the longitudinal beam is h=h1, which is the maximum height of the vehicle body, as shown in Figure 4 As shown; when θ=θ2, the distance between the vehicle body and the longitudinal beam is h=h2, which is the minimum height of the vehicle body, as shown Figure 5 As shown; the wheel (15) rotates relative to the longitudinal beam (14) and the vehicle travels. During the vehicle travel, the two wheels are loaded and the dual shock absorbers (13) are deformed in coordination, and the wheelbases of the two wheels remain unchanged.

[0014] Figure 6The diagram of the coordinated deformation principle of the dual-wheel suspension shock absorber is shown. The principle of coordinated deformation of the dual shock absorbers is: when the vehicle is driving, given the angle θ between the rocker arm and the body, and the height of the body from the ground is H, assuming that the force on the Q-axis wheel road surface changes, the wheel rises ΔH, and the compression shock absorber C'D deforms Δa. At this time, the longitudinal beam rotates around the P axis and moves with the driving of the vehicle. The quadrilateral motion chain OA'B'D' transmits the motion, and the other shock absorber D'C produces a deformation Δc. The deformations Δa and Δc of the two shock absorbers jointly balance the external force, the dual shock absorbers deform in a coordinated manner, and the vehicle drives stably longitudinally.

[0015] Figure 2 In the height-adjustable two-wheel suspension schematic diagram, a brake motor is used to control the rocker arm angle configuration. In the above-mentioned height-adjustable two-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 and the motor is energized. The brake motor is connected in series with the planetary gear reducer or the RV reducer to drive the rocker arm to rotate, and 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 passing performance is improved. After the power is off, the motor stops energizing, 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.

[0016] Figure 7 The schematic diagram of the configuration of the worm gear pair controlling the angle of the rocker arm is shown. In the above-mentioned height-adjustable two-wheel suspension, the motor (16) is a permanent magnet synchronous motor, and the reducer (17) is a worm reducer with a 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 reversely drives and self-locks, that is, the worm wheel can only be driven by the worm, but the worm wheel cannot drive the worm. When the motor is energized, the worm gear pair reduces the transmission, and the motor is connected in series with the worm 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 high-speed driving stability of the vehicle is improved. When the motor stops energizing, the worm gear pair reversely drives 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.

[0017] Figure 8 A vehicle chassis composition schematic diagram is shown, a vehicle chassis, including: two sets of height-adjustable double-wheel suspensions with the same structure and performance parameters are arranged symmetrically on the left and right sides of the vehicle body mid-vertical plane according to a given wheelbase, share the same vehicle body, and the four wheels are independently driven by hub motors and differentially steered; the vehicle wheelbase and wheelbase remain unchanged, and the vehicle chassis height is dynamically adjustable; the four wheels are loaded, the suspension mechanism is linked, and the double shock absorbers are deformed in a coordinated manner, and the wheel group has good load-bearing capacity and longitudinal impact resistance, so as to improve the vehicle's ground adaptability and driving speed.

Claims

1. Height-adjustable two-wheel suspension, characterized by: include: One end of the two connecting rods is rotatably connected to one end of the two rocker arms and the two shock absorbers, two connection points D and D', one end of the other two connecting rods is rotatably connected to the body and the longitudinal beam, two connection points A and A', the other ends of the four equal-length connecting rods are rotatably connected around the same axis, connection point O, the other ends of the two equal-length rocker arms are rotatably connected to the body and the longitudinal beam, two connection points B and B', the two shock absorbers are arranged in an X-shaped staggered manner, the other ends of the two identical shock absorbers are rotatably connected to the body and the longitudinal beam, two connection points C and C' are respectively located on the AB extension line of the body and the A'B' extension line of the longitudinal beam, the rotation axes at each rotation connection point are parallel to each other and perpendicular to the mid-vertical plane of the body, forming a motion chain with the same relative motion plane, The relative motion plane is parallel to the median 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 median 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 connected in series with the reducer and is fixedly installed on the vehicle body, 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 from the ground changes, the angle between the rocker arm and the vehicle body, and the height of the vehicle body from the ground are determined, the wheel rotates relative to the longitudinal beam, the vehicle moves, the two wheels are loaded, and the double shock absorbers deform in a coordinated manner.

2. The height-adjustable two-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 power is on, the brake is released and the motor is energized, and the brake motor is connected in series with the planetary gear reducer or the RV reducer to drive the rocker arm to rotate, and the height of the vehicle body from the ground changes; after power is off, the motor stops energizing, the brake brakes the motor shaft, and the height of the vehicle body relative to the ground is locked.

3. The height-adjustable two-wheel suspension according to claim 1, characterized in that: The motor is a permanent magnet synchronous motor, and the reducer is a worm reducer with a reverse self-locking function; when the motor is energized, the worm pair is driven to reduce speed, and the motor is connected in series with the worm reducer to drive the rocker arm to rotate, and the height of the vehicle body from the ground changes; when the motor stops energizing, the worm pair is reversely driven and self-locked, and the height of the vehicle body relative to the ground is locked.

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

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