Adjustable wheelbase dual wheel suspension and vehicle using the same

Abstract

The present application relates to a kind of wheelbase adjustable double wheel suspensions and vehicle applying the suspension, belong to vehicle chassis technical field, especially relate to the balanced suspension control technical category;Double wheel suspension is connected two wheels by multiple connecting rod mechanism according to the wheelbase set, double wheel bearing, suspension mechanism linkage, double shock absorber coordinated deformation, provide a kind of longitudinal double wheel balanced suspension, with the characteristics of good ground adaptability and longitudinal stability, applied to the balanced suspension system of various multipurpose vehicles;On this basis, a kind of two-wheeled electric vehicle is proposed, vehicle wheelbase dynamic adjustable, front and rear shock absorber coordinated deformation, provide a new method for electric motorcycle design.

Description

TECHNICAL FIELD

[0001] The present application relates to a wheelbase-adjustable double-wheel suspension and a vehicle using the same, and belongs to the technical field of vehicle chassis, in particular to the technical field of balance suspension control. BACKGROUND

[0002] The balance suspension is applied to three-axle and four-axle off-road trucks, so that each wheel has adhesion when the vehicle runs on uneven road, and the vertical loads of the front and rear wheels are 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 side tilt, pitch and roll during running. After lightweight design, the balance suspension has the characteristics of light weight, good damping and guiding effect, and high stability, and is applied to the balance suspension system of various multipurpose vehicles. The main advantage of the balance suspension is to improve the handling performance and safety performance of the vehicle, so as to improve the stability of the vehicle during high-speed running.

[0003] Compared with the independent suspension, the whole axle is a transverse double-wheel balance suspension determined by the wheel track, the wheels on both sides are loaded, the elastic deformation movement of the torsion bar and the coordinated deformation of the damping systems on both sides are used, the vehicle can withstand greater lateral external force and resist instantaneous centrifugal force on the curve, the vehicle has good lateral stability, good strength and simple structure, and can improve the road adaptability and curve driving speed of the vehicle. When the vehicle runs on uphill and downhill road or starts and brakes, the change of the driving direction external force and the sudden change of the forward direction impact force affect the longitudinal stability of the vehicle. The longitudinal double-wheel balance suspension determined by the wheel track, the front and rear wheels are loaded, and the double damping systems are coordinated to deform, so that the vehicle can withstand greater driving direction external force and resist forward direction instantaneous impact force. The vehicle has good longitudinal stability, which is beneficial to improve the driving speed of the vehicle. SUMMARY

[0004] The present application aims to provide a wheelbase-adjustable double-wheel suspension and a vehicle using the same. The double-wheel suspension connects two wheels according to the set wheelbase, the double-wheel is loaded, the suspension mechanism is linked, and the double shock absorbers are coordinated to deform. The vehicle has dynamic adjustable wheelbase, which improves the wheel set load performance and the longitudinal stability of the vehicle, so as to improve the ground adaptability and driving speed of the vehicle.

[0005] The technical scheme adopted to achieve the purpose of the present application includes:

[0006] The axle distance adjustable double wheel suspension includes: the body (10) is provided with the supporting shaft (101) perpendicular to the body vertical plane and the straight line guide rail (102) perpendicular to the body horizontal plane, and the body transverse vertical plane N passes through the supporting shaft (101) axis, the supporting shaft (101) of the body is respectively connected with one end of the two pull rods (11) in rotation, the connecting point O, the other end of the two equal length pull rods (11) is respectively connected with one end of the two longitudinal beams (14) in rotation, the two connecting points A, A', the two longitudinal beams (14) are reversely arranged; the two swing rods (12) are staggered arranged in X type, the middle points of the two equal length swing rods (12) are respectively connected with the supporting shaft (101) in rotation, the lower ends of the two swing rods (12) are respectively connected with one end of the two swing arms (13) in rotation, the two connecting points D, D', the other end of the two equal length swing arms (13) is respectively connected with the two longitudinal beams (14) in rotation, the two connecting points B, B', the upper end of the two swing rods (12) is respectively connected with one end of the two shock absorbers (16) in rotation, the two connecting points E, E', the other end of the two same shock absorbers (16) is respectively connected with the two longitudinal beams (14) in rotation, the two connecting points C, C' are respectively located on the AB and A'B' extension lines of the longitudinal beams, the rotation axes of the respective rotation connecting points are parallel to each other and are perpendicular to the body vertical plane, a motion chain with the same relative motion plane is formed, and the relative motion plane is parallel to the body vertical plane; in the same relative motion plane, the geometric conditions are met: DB=D'B'=AB=A'B', AO=A'O=2DB, DE'=ED'=4DB, EC=E'C'=4DB, AC=A'C'=4DB; the other end P, Q of the two longitudinal beams (14) is respectively connected with the two wheels (15) in rotation, and the rotation axes of the two wheels (15) are perpendicular to the body vertical plane.

[0007] The axle distance control mode of the two wheels: the sliding block (17) is movably connected with the straight line guide rail (102) of the body, one end of the two connecting rods (18) is respectively connected with the sliding block (17) in rotation, the two connecting points F, F' are symmetrical about the plane N, the other end of the two equal length connecting rods (18) is respectively connected with the two swing arms (13) in rotation, the two connecting points G, G' are symmetrical about the plane N, and the rotation axes of the respective rotation connecting points are perpendicular to the body vertical plane; the sliding block (17) moves along the straight line guide rail (102) with a displacement h, the axle distance of the two wheels (15) changes, the axle distance S=f(h), the movement of the sliding block (17) along the straight line guide rail (102) is limited, and the axle distance S of the two wheels (15) is determined; the wheel (15) rotates relative to the longitudinal beam (14), the vehicle travels, the two wheels (15) are loaded, the suspension mechanism is linked, the two shock absorbers (16) are deformed coordinately, and the axle distance adjustable double wheel suspension is formed.

[0008] The sliding block moves along the linear guide driven and controlled by the hydraulic cylinder, which is suitable for general medium load vehicles; the sliding block moves along the linear guide driven and controlled by the electric push rod or electric cylinder, which is suitable for light load vehicles.

[0009] A vehicle comprising the above-mentioned adjustable wheelbase double-wheel suspension;

[0010] The four-wheel vehicle comprises two groups of adjustable wheelbase double-wheel suspensions with the same structure and performance parameters, which are arranged in the left-right symmetrical plane of the vehicle body according to the given wheelbase, share the same vehicle body, and are independently driven and differentially steered; the wheelbase of the vehicle chassis is constant, the wheelbase is dynamically adjustable, the four wheels are load-bearing, the suspension mechanism is linked, and the double shock absorbers are coordinately deformed, so that the load-bearing capacity and longitudinal stability of the wheel set are good, thereby improving the ground adaptability and driving speed of the vehicle.

[0011] A two-wheel electric vehicle, which is changed in the connection mode of the wheel (15) at the end Q of the longitudinal beam (14) in the above-mentioned adjustable wheelbase double-wheel suspension, and one wheel (15) is connected through the steering spindle (21) and the steering knuckle (22), and the wheel is steered, and the wheel (15) at P is driven to form, comprising: given PQ as the forward direction of the vehicle, the wheel (15) at P as the rear wheel of the vehicle, a wheel midplane M perpendicular to the rotation axis of the rear wheel, a steering axis L of the steering spindle (21), under the condition that L is located in the rear wheel midplane M and the relative plane N is given a rear inclination angle δ, the steering spindle (21) is fixedly installed at the end Q of the longitudinal beam (14); the steering knuckle (22) is provided with a wheel shaft and a steering knuckle arm, the steering knuckle (22) is rotationally connected with the steering spindle (21) around L, and the axis of the wheel shaft is perpendicular to L, the wheel (15) is rotationally connected with the wheel shaft of the steering knuckle (22) to become the front wheel of the vehicle, and the front wheel midplane M' passes through the steering axis L; the steering drive shaft (23) is provided with a steering rocker arm, the steering drive shaft (23) is rotationally connected with the longitudinal beam (14), and the rotation axis is parallel to L, one end of the steering tie rod (24) is connected with the ball hinge of the steering knuckle arm of the steering knuckle (22), the other end is connected with the ball hinge of the steering rocker arm of the steering drive shaft (23), forming a parallelogram mechanism IJKT in a plane perpendicular to L, the steering column (26) is rotationally connected with the vehicle body (10), and the double universal joints (25) are connected with the steering drive shaft (23) and the steering column (26) through splines at both ends; the steering angle θ is input from the steering column (26), the front wheel is rotated around the steering axis L through the transmission of the double universal joints and the parallelogram mechanism, the vehicle is steered, the rear wheel is driven, the vehicle is driven, the two wheels are load-bearing, the suspension mechanism is linked, and the double shock absorbers are coordinately deformed; the telescopic spline shaft between the double universal joints is driven, the front and rear wheels are dynamically adjustable, the motorcycle tires with arc-shaped cross sections are selected for the front and rear wheels, and a two-wheel electric vehicle is formed.

[0012] Wherein: when the turning angle θ=0, the mid-planes M' and M of the two wheels coincide, and the vehicle travels straight; when the turning angle θ≠0, the vehicle turns, the parallelogram mechanism keeps the left and right turning of the vehicle symmetrical, the displacement h of the sliding block and the wheelbase S=f(h) are adjusted by the electric push rod, increasing the wheelbase S of the vehicle can improve the driving stability of the vehicle, and the application is suitable for long-distance and high-speed cruising of the two-wheeled electric vehicle; when the two-wheeled electric vehicle is used for mountain off-road driving and emphasizes the vehicle mobility, the wheelbase S is reduced, so as to improve the vehicle handling performance.

[0013] The application has the advantages that the proposed axle distance adjustable double-wheel suspension and the vehicle applying the suspension provide a longitudinal double-wheel balance suspension, the ground adaptability and longitudinal stability of the vehicle are improved through double-wheel bearing, suspension mechanism linkage and coordinated deformation of double shock absorbers; on this basis, a two-wheeled electric vehicle is provided, the wheelbase of the vehicle is dynamically adjustable, and the front and rear shock absorbers are deformed coordinately. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the axle distance adjustable double-wheel suspension mechanism;

[0015] Figure 2 It is a composition principle diagram of the axle distance adjustable double-wheel suspension;

[0016] Figure 3 It is an axle distance adjustment principle diagram of the double-wheel suspension;

[0017] Figure 4 It is a minimum wheelbase position diagram of the double-wheel suspension;

[0018] Figure 5 It is a maximum wheelbase position diagram of the double-wheel suspension;

[0019] Figure 6 It is a shock absorber coordinated deformation principle diagram of the double-wheel suspension;

[0020] Figure 7 It is a composition principle diagram of a four-wheeled vehicle;

[0021] Figure 8 It is a composition principle diagram of a two-wheeled electric vehicle;

[0022] Figure 9 It is a front wheel positioning principle diagram of the two-wheeled electric vehicle;

[0023] Figure 10 It is a front wheel turning principle diagram of the two-wheeled electric vehicle, (a) is a horizontal plane projection diagram of the turning wheel, (b) is a θ=30° turning principle diagram, and (c) is a θ=0° straight traveling principle diagram;

[0024] In the figure: 10 - vehicle body, 101 - support shaft, 102 - linear guide, 11 - pull rod, 12 - swing rod, 13 - swing arm, 14 - longitudinal beam, 15 - wheel, 16 - shock absorber, 17 - sliding block, 18 - connecting rod, 21 - steering spindle, 22 - steering knuckle, 23 - steering drive shaft, 24 - steering pull rod, 25 - double universal joint, 26 - steering column. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described below with reference to the accompanying drawings:

[0026] Figure 1 The schematic diagram of the adjustable wheelbase double-wheel suspension mechanism is shown, and the adjustable wheelbase double-wheel suspension mechanism comprises: a support shaft (101) and a linear guide (102) which are arranged on a vehicle body (10) and are perpendicular to a vehicle body median plane and a vehicle body horizontal plane, and a vehicle body transverse plane N which passes through the axis of the support shaft (101); the support shaft (101) of the vehicle body is rotationally connected to one end of two pull rods (11) at a connection point O; the other ends of the two equal-length pull rods (11) are rotationally connected to one end of two longitudinal beams (14) at two connection points A and A'; the two longitudinal beams (14) are arranged in opposite directions; two swing rods (12) are arranged in an X-shaped staggered manner; the midpoints of the two equal-length swing rods (12) are rotationally connected to the support shaft (101); the lower ends of the two swing rods (12) are rotationally connected to one end of two swing arms (13) at two connection points D and D'; the other ends of the two equal-length swing arms (13) are rotationally connected to the two longitudinal beams (14) at two connection points B and B'; the upper ends of the two swing rods (12) are rotationally connected to one end of two shock absorbers (16) at two connection points E and E'; the other ends of the two equal shock absorbers (16) are rotationally connected to the two longitudinal beams (14); the two connection points C and C' are located on the extension lines of AB and A'B' of the longitudinal beams; the rotational axes of the rotationally connected points are parallel to each other and are perpendicular to the vehicle body median plane, forming a motion chain with the same relative motion plane, and the relative motion plane is parallel to the vehicle body median plane; in the same relative motion plane, the geometric conditions are satisfied: DB=D'B'=AB=A'B', AO=A'O=2DB, DE'=ED'=4DB, EC=E'C'=4DB, and AC=A'C'=4DB; the other ends P and Q of the two equal-length longitudinal beams (14) are rotationally connected to two wheels (15); and the rotational axes of the two wheels (15) are perpendicular to the vehicle body median plane.

[0027] The distance between the two wheels is controlled by the following way: the slider (17) is connected with the linear guide (102) of the vehicle body, one end of the two connecting rods (18) is connected with the slider (17) respectively, the two connecting points F and F' are symmetrical about the plane N, the other end of the two equal-length connecting rods (18) is connected with the two swing arms (13) respectively, the two connecting points G and G' are symmetrical about the plane N, G and G' are points on the swing arms DB and D'B' respectively, and the rotation axes of the various rotation connecting points are perpendicular to the median plane of the vehicle body; the slider (17) moves along the linear guide (102) with a displacement h, the two longitudinal beams (14) move horizontally in the same relative movement plane, and ABC and A'B'C' are always collinear, the distance between the two wheels (15) changes, and the distance S=f(h), as shown in Figure 3 When h=h1, the distance S between the two wheels is S1, which is the minimum distance of the vehicle, as shown in Figure 4 When h=h2, the distance S between the two wheels is S2, which is the maximum distance of the vehicle, as shown in Figure 5 The movement of the slider (17) along the linear guide (102) and the distance S between the two wheels (15) are determined; the wheels (15) rotate relative to the longitudinal beams (14), the vehicle travels, the two wheels (15) bear, the suspension mechanism is linked, the two shock absorbers (16) deform coordinately, and the adjustable-distance double-wheel suspension is formed, as shown in Figure 2 The adjustable-distance double-wheel suspension is symmetrical about the plane N.

[0028] In the above adjustable-distance double-wheel suspension, the movement of the slider along the linear guide is driven and controlled by a hydraulic cylinder, the end of the cylinder is rotationally connected with the vehicle body (10), and the output end of the piston rod is rotationally connected with the slider (17), which is suitable for general medium-load vehicles; the movement of the slider along the linear guide is driven and controlled by an electric push rod or an electric cylinder, the body of the push rod or the cylinder is rotationally connected with the vehicle body (10), and the output end of the push rod or the cylinder rod is rotationally connected with the slider (17), which is suitable for light-load vehicles.

[0029] Figure 6 The principle diagram of the coordinated deformation of the double-wheel suspension shock absorber is shown in the figure, and the principle of the coordinated deformation of the double shock absorber is as follows: during the travel of the vehicle, the slider (17) is limited to move along the linear guide (102), that is, the given displacement is h, the distance between the two wheels (15) is fixed as S, and the height of the vehicle body from the ground is H; it is assumed that the road force of the P-side wheel changes, the wheel rises ΔH, and the compression shock absorber CE deforms Δp; at this time, the P-side longitudinal beam moves in a plane parallel to the median plane of the vehicle body, the suspension mechanism transmits the movement, the quadrilateral movement chains ABDO and ODGF deform, DE' rotates around point O, and the other shock absorber C'E' deforms Δq; the deformations Δp and Δq of the two shock absorbers balance the external force together, the double shock absorbers deform coordinately, and the longitudinal stability of the vehicle is maintained.

[0030] Figure 7A four-wheel vehicle composition principle diagram is shown, wherein: the xy plane is the vehicle body horizontal plane, the yz plane is the vehicle body transverse vertical plane, and the xz plane is the vehicle body central vertical plane; a four-wheel vehicle comprises: two groups of double-wheel suspensions with the same structure and performance parameters and adjustable wheelbase, which are arranged symmetrically left and right in the vehicle body central vertical plane according to a given vehicle wheelbase, share the same vehicle body, four wheels are independently driven by hub motors and differentially steered; the vehicle chassis wheelbase is constant, the wheelbase is dynamically adjustable, four wheels are loaded, the suspension mechanism is linked, and double shock absorbers are coordinately deformed, so that the load capacity and longitudinal stability of the wheel set are good, so as to improve the ground adaptability and driving speed of the vehicle.

[0031] Figure 8 A two-wheel electric vehicle composition principle diagram is shown, and a two-wheel electric vehicle is formed by changing the wheel (15) connection mode at the Q end of the longitudinal beam (14) in the above-mentioned double-wheel suspension with adjustable wheelbase, and coupling one wheel (15) through a steering spindle (21) and a steering knuckle (22), the wheel is steered, the wheel (15) at P is driven to form, comprising: given PQ is the vehicle forward direction, the wheel (15) at P is used as the rear wheel of the vehicle, a wheel median plane M perpendicular to the rear wheel rotation axis is provided, M is parallel to the vehicle body central vertical plane, the steering spindle (21) has a steering axis L, L is located in the rear wheel median plane M, and the steering spindle (21) is fixedly installed at the Q end of the longitudinal beam (14) under the condition that L is given a rear inclination angle δ relative to the plane N, as shown in Figure 9 δ=22.5°; the steering knuckle (22) is provided with a wheel shaft and a steering knuckle arm, the steering knuckle (22) is rotationally connected with the steering spindle (21) around L, and the axis of the wheel shaft is perpendicular to L, and the steering knuckle arm is perpendicular to L, the wheel (15) is rotationally coupled with the wheel shaft of the steering knuckle (22) to become the front wheel of the vehicle, and the front wheel median plane M' passes through the steering axis L; the steering drive shaft (23) is provided with a steering rocker arm, the steering rocker arm is perpendicular to the axis of the steering drive shaft, the steering drive shaft (23) is rotationally connected with the longitudinal beam (14), the rotation axis is parallel to L, one end of the steering tie rod (24) is connected with the ball hinge of the steering knuckle arm of the steering knuckle (22), the other end is connected with the ball hinge of the steering rocker arm of the steering drive shaft (23), a parallelogram mechanism IJKT in a plane perpendicular to L is formed, the steering column (26) is rotationally connected with the vehicle body (10), the two ends of the double universal joint (25) are coupled with the steering drive shaft (23) and the steering column (26) through splines respectively; a steering angle θ is input from the steering column (26), the front wheel is rotated around the steering axis L through the double universal joint and the parallelogram mechanism, the vehicle is steered, and the rear wheel is driven by the hub motor, the vehicle drives, as shown in Figure 10 (a); two wheels are loaded, the suspension mechanism is linked, and the double shock absorbers are coordinately deformed, the transmission is achieved through the telescopic spline shaft between the double universal joints, the vehicle wheelbase is dynamically adjustable, the front and rear wheels are selected to be motorcycle tires GB518-2007 with an arc-shaped curve cross section, and a two-wheel electric vehicle is formed.

[0032] Wherein: when the turning angle θ = 0, the mid-planes M', M of the two wheels coincide, and the vehicle travels straight, as shown in Figure 10 (c); when the turning angle θ ≠ 0, the vehicle turns, as shown in Figure 10 (b), the parallelogram mechanism keeps the left and right turning of the vehicle symmetrical; the displacement h of the sliding block is adjusted by the electric push rod, the wheelbase S = f(h) changes, the wheelbase dynamically adjusts during the vehicle travel, and the change of the wheelbase is transmitted through the telescopic spline shaft between the double universal joints to adapt to the change of the wheelbase of the vehicle; increasing the wheelbase S of the vehicle can improve the travel stability of the vehicle, and is suitable for long-distance and high-speed cruising travel of the two-wheeled electric vehicle; when the two-wheeled electric vehicle travels in mountainous areas and emphasizes the vehicle mobility, the wheelbase S is reduced to improve the vehicle handling performance.

Claims

1. A wheel suspension with adjustable wheel base, characterized in that The body is provided with a supporting shaft perpendicular to the body median plane, a linear guide perpendicular to the body horizontal plane, and a body transverse plane N passing through the supporting shaft axis, the supporting shaft of the body is rotatably connected with one end of two pull rods, the connecting points are O, the other ends of the two equal-length pull rods are rotatably connected with one end of two longitudinal beams, the two connecting points are A and A', the two longitudinal beams are reversely arranged; two swing rods are arranged in an X-shaped staggered manner, the midpoints of the two equal-length swing rods are rotatably connected with the supporting shaft, the lower ends of the two swing rods are rotatably connected with one end of two rocker arms, the two connecting points are D and D', the other ends of the two equal-length rocker arms are rotatably connected with the two longitudinal beams, the two connecting points are B and B', the upper ends of the two swing rods are rotatably connected with one end of two shock absorbers, the two connecting points are E and E', the other ends of the two equal-length shock absorbers are rotatably connected with the two longitudinal beams, the two connecting points C and C' are located on the extension lines of AB and A'B' of the longitudinal beams, the rotation axes of the rotating connecting points are parallel to each other and perpendicular to the body median plane, a motion chain with the same relative motion plane is formed, and the relative motion plane is parallel to the body median plane; in the same relative motion plane, the geometric conditions are satisfied: DB=D'B'=AB=A'B', AO=A'O=2DB, DE'=ED'=4DB, EC=E'C'=4DB, and AC=A'C'=4DB; the other ends P and Q of the two longitudinal beams are rotatably connected with two wheels, and the rotation axes of the two wheels are perpendicular to the body median plane. The slider is movably connected with the linear guide of the body, one end of each of the two connecting rods is rotatably connected with the slider, the two connecting points are symmetrical about the plane N, the other end of each of the two equal-length connecting rods is rotatably connected with the two rocker arms, and the two connecting points are symmetrical about the plane N; the axes of the two wheels change when the slider moves along the linear guide, the axes of the two wheels are determined when the slider moves along the linear guide, the wheels rotate relative to the longitudinal beams, the vehicle travels, the two wheels are loaded, the suspension mechanism is linked, and the two shock absorbers are deformed coordinately. The movement of the slider along the linear guide is driven and controlled by a hydraulic oil cylinder.

2. The track width adjustable double wheel suspension according to claim 1, wherein The movement of the slider along the linear guide is driven and controlled by an electric push rod or an electric cylinder.

3. The track width adjustable double wheel suspension according to claim 1, wherein The adjustable-axle-distance double-wheel suspension according to claim 1.

4. A vehicle characterized by comprising: The adjustable-axle-distance double-wheel suspension according to claim 1. ​ 5. A two-wheeled electric vehicle characterized by comprising: ​ The axle distance adjustable double wheel suspension according to claim 1, wherein given PQ is the vehicle advancing direction, P is the rear wheel of the vehicle, a wheel median plane M perpendicular to the rotation axis of the rear wheel, a steering axis L of the steering spindle, the steering spindle is fixedly installed at the Q end of the longitudinal beam under the condition that L is located in the rear wheel median plane M and the relative plane N is given rear rake angle; the knuckle is provided with a wheel shaft and a knuckle arm, the knuckle is rotationally connected with the steering spindle around L, and the axis of the wheel shaft is perpendicular to L, the wheel is rotationally connected with the knuckle around the wheel shaft, becomes the front wheel of the vehicle, and the front wheel median plane passes through the steering axis L; the steering drive shaft is provided with a steering rocker arm, the steering drive shaft is rotationally connected with the longitudinal beam, and the rotation axis is parallel to L, one end of the steering tie rod is connected with the knuckle arm ball hinge of the knuckle, the other end is connected with the steering rocker arm ball hinge of the steering drive shaft, a parallelogram mechanism in a plane perpendicular to L is formed, the steering column is rotationally connected with the vehicle body, and the two ends of the double universal joint are coupled with the steering drive shaft and the steering column through splines respectively; the steering angle is input by the steering column, is transmitted through the double universal joint and the parallelogram mechanism, the front wheel rotates around the steering axis L, the vehicle turns, the rear wheel drives, the vehicle travels, the two wheels bear, the suspension mechanism links, the double shock absorbers coordinate deformation, the telescopic spline shaft between the double universal joints is driven, and the axle distance of the two-wheel vehicle is dynamically adjustable.

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