Axle-distance-adjustable double-wheel suspension and vehicle applying same

Abstract

The invention relates to a wheelbase-adjustable double-wheel suspension and a vehicle using the same, belongs to the technical field of vehicle chassis, and particularly relates to the technical field of balanced suspension control. The double-wheel suspension is connected with two wheels through a multi-connecting-rod mechanism according to the set axle distance, double-wheel bearing is achieved, suspension mechanism linkage is achieved, double dampers deform in a coordinated mode, and the longitudinal double-wheel balanced suspension is provided, has the advantages of being good in ground adaptability and longitudinal stability and is applied to balanced suspension systems of various multipurpose automobiles. On the basis, the two-wheeled electric vehicle is provided, the wheelbase of the vehicle is dynamically adjustable, the front shock absorber and the rear shock absorber deform in a coordinated mode, and a new method is provided for design of the electric motorcycle.

Description

Technical Field

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

[0002] The balancing suspension is applied to three-axle and four-axle off-road trucks, so that when the vehicle 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 balancing 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 yaw during driving; after the lightweight design of the balancing suspension, it has the characteristics of light weight, good shock absorption and guiding buffering effect, and high stability, and is applied to the balancing suspension system of various multi-purpose vehicles. The main advantage of the balancing 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. The wheels on both sides bear the loads. 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 force and resist instantaneous centrifugal force in curves. 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 force in the driving direction of the vehicle and sudden changes in instantaneous impact force in the forward direction will affect the longitudinal stability of the vehicle. The longitudinal double-wheel balanced suspension determined by the wheelbase, the front and rear wheels bear the loads, and the double shock absorbing systems deform in a coordinated manner, so that the vehicle can withstand greater external force in the driving direction and resist instantaneous impact force in the forward direction. 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 wheelbase-adjustable two-wheel suspension and a vehicle using the suspension. The two-wheel suspension connects two wheels according to a set wheelbase, the two wheels are loaded, the suspension mechanism is linked, and the two shock absorbers are deformed in a coordinated manner. The vehicle wheelbase is dynamically adjustable, the wheel group load performance and the vehicle longitudinal stability performance are improved, 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: The wheelbase adjustable two-wheel suspension comprises: a vehicle body (10) is provided with a support shaft (101) perpendicular to the mid-vertical plane of the vehicle body and a linear guide rail (102) perpendicular to the horizontal plane of the vehicle body, and a vehicle body transverse vertical plane N passing through the axis of the support shaft (101); the support shaft (101) of the vehicle body is rotatably connected to one end of two tie rods (11) at a connection point O, the other ends of the two equal-length tie rods (11) are rotatably connected to one end of two longitudinal beams (14) at two connection points A and A', and 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 rotatably connected to the support shaft (101), the lower ends of the two swing rods (12) are rotatably connected to one end of two rocker arms (13) at two connection points D and D', the other ends of the two equal-length rocker arms (13) are rotatably connected to the two longitudinal beams (14) at two connection points B and B', The upper ends of the two swing arms (12) are respectively rotatably connected to one end of the two shock absorbers (16), the two connection points E and E', the other ends of the two identical shock absorbers (16) are respectively rotatably connected to the two longitudinal beams (14), the two connection points C and C' are respectively located on the extension lines AB and A'B' of the longitudinal beams, the rotation axes at the rotation connection points are parallel to each other and perpendicular to the mid-vertical plane of the vehicle body, forming a motion chain with the same relative motion plane, and the relative motion plane is parallel to the mid-vertical plane of the vehicle body; 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, AC=A'C'=4DB; the other ends P and Q of the two longitudinal beams (14) are respectively rotatably connected to the two wheels (15), and the rotation axes of the two wheels (15) are perpendicular to the mid-vertical plane of the vehicle body; The wheelbase control method of the two wheels is as follows: the slider (17) is movably connected to the linear guide rail (102) of the vehicle body, one end of the two connecting rods (18) is respectively rotatably connected to the slider (17), the two connecting points F and F' are symmetrical about the plane N, the other ends of the two equal-length connecting rods (18) are respectively rotatably connected to the two rocker arms (13), the two connecting points G and G' are symmetrical about the plane N, and the rotation axes at each rotation connection point are perpendicular to the mid-vertical plane of the vehicle body; the slider (17) moves along the linear guide rail (102) and the displacement h, the wheelbase of the two wheels (15) changes, the wheelbase S=f(h), the slider (17) is limited to move along the linear guide rail (102), and the wheelbase 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, and the double shock absorbers (16) are deformed in a coordinated manner, so as to form a two-wheel suspension with adjustable wheelbase.

[0006] In the above-mentioned wheelbase adjustable two-wheel suspension, the movement of the slider along the linear guide is driven and controlled by the hydraulic cylinder, which is suitable for general medium-load vehicles; the movement of the slider along the linear guide is driven and controlled by the electric push rod or electric cylinder, which is suitable for light-load vehicles.

[0007] A vehicle, comprising: the above-mentioned wheelbase-adjustable two-wheel suspension; Among them, a four-wheel vehicle includes: two sets of wheelbase-adjustable double-wheel suspensions with the same structure and performance parameters are arranged symmetrically on the left and right sides of the vehicle body according to a given vehicle track and share the same vehicle body, and the four wheels are independently driven and differentially steered; the vehicle chassis track remains unchanged, the wheelbase is dynamically adjustable, the four wheels are loaded, the suspension mechanism is linked, the double shock absorbers are deformed in a coordinated manner, and the wheel group has good load-bearing capacity and longitudinal stability, so as to improve the vehicle's ground adaptability and driving speed.

[0008] A two-wheeled electric vehicle is formed by changing the connection mode of the wheel (15) at Q of one end of the longitudinal beam (14) in the above-mentioned wheelbase adjustable two-wheel suspension, connecting a wheel (15) through a steering spindle (21) and a steering knuckle (22), steering the wheel, and driving the wheel (15) at P. The method comprises: setting PQ as the forward direction of the vehicle, the wheel (15) at P as the rear wheel of the vehicle, setting a wheel mid-plane M perpendicular to the rear wheel rotation axis, and a steering axis L of the steering spindle (21), and at L The steering spindle (21) is fixedly mounted on the Q end of the longitudinal beam (14) and is located in the rear wheel mid-plane M and at a given caster angle δ relative to the plane N; a wheel axle and a steering knuckle arm are provided on the steering knuckle (22); the steering knuckle (22) is connected to the steering spindle (21) for rotation around L, and the axis of the wheel axle is perpendicular to L; the wheel (15) is connected for rotation around the wheel axle of the steering knuckle (22) to become the front wheel of the vehicle, and the front wheel mid-plane M' passes through the steering axis L; the steering drive shaft (2 3) is provided with a steering rocker arm, a steering drive shaft (23) is rotatably connected to the longitudinal beam (14), and the rotation axis is parallel to L, one end of the steering tie rod (24) is connected to the steering knuckle arm ball hinge of the steering knuckle (22), and the other end is connected to the steering rocker arm ball hinge of the steering drive shaft (23), forming a parallelogram mechanism IJKT perpendicular to the plane L, a steering column (26) is rotatably connected to the vehicle body (10), and the two ends of the double universal joint (25) are respectively connected to the steering drive shaft (23) and the steering column (26) through splines; the steering angle θ is input by the steering column (26), and is transmitted through the double universal joint and the parallelogram mechanism, so that the front wheel rotates around the steering axis L, the vehicle steers, the rear wheel is driven, and the vehicle travels, the two wheels are loaded, the suspension mechanism is linked, and the double shock absorbers are deformed in coordination; the transmission is transmitted by the telescopic spline shaft between the double universal joints, so that the wheelbase of the two-wheeled vehicle can be dynamically adjusted, and the front and rear wheels are both selected from motorcycle tires with arc-shaped cross-sections, forming a two-wheeled electric vehicle.

[0009] Among them: when the steering angle θ=0, the median planes M' and M of the two wheels coincide, and the vehicle travels in a straight line; when the steering angle θ≠0, the vehicle turns, and the parallelogram mechanism keeps the left and right steering symmetry of the vehicle. The electric push rod adjusts the slider displacement h and the wheelbase S=f(h). Increasing the vehicle wheelbase S can improve the vehicle's driving stability, which is suitable for two-wheeled electric vehicles in long-distance, high-speed cruising. When two-wheeled electric vehicles are driving off-road in mountainous areas and emphasize vehicle mobility, the wheelbase S is reduced to improve the vehicle's handling performance.

[0010] The beneficial effects of the present invention are that the proposed two-wheel suspension with adjustable wheelbase and the vehicle using the suspension provide a longitudinal two-wheel balanced suspension, which improves the ground adaptability and longitudinal stability of the vehicle through double-wheel load-bearing, suspension mechanism linkage, and coordinated deformation of double shock absorbers; on this basis, a two-wheeled electric vehicle is proposed, the vehicle wheelbase is dynamically adjustable, and the front and rear shock absorbers are coordinated in deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a simplified diagram of the wheelbase adjustable two-wheel suspension mechanism; Figure 2 This is the schematic diagram of the wheelbase adjustable two-wheel suspension; Figure 3 This is the schematic diagram of the wheelbase adjustment of the double wheel suspension; Figure 4 It is the minimum wheelbase position diagram of the two-wheel suspension; Figure 5 This is the maximum wheelbase position diagram of the two-wheel suspension; Figure 6 It is the principle diagram of coordinated deformation of the dual-wheel suspension shock absorber; Figure 7 It is a schematic diagram of a four-wheel vehicle; Figure 8 The present invention is a schematic diagram of a two-wheel electric vehicle; Fig. 9 This is the principle diagram of the front wheel alignment of a two-wheeled electric vehicle; Fig.10 The schematic diagram of the front wheel steering of a two-wheeled electric vehicle, (a) the projection diagram of the steering wheel on the horizontal plane of the vehicle body, (b) the steering schematic diagram of θ=30°, and (c) the straight-line driving schematic diagram of θ=0°; In the figure: 10--body, 101--support shaft, 102--linear guide, 11--tie rod, 12--swing rod, 13--rocker arm, 14--longitudinal beam, 15--wheel, 16--shock absorber, 17--slider, 18--connecting rod, 21--steering spindle, 22--steering knuckle, 23--steering drive shaft, 24--steering tie rod, 25--double universal joint, 26--steering column. DETAILED DESCRIPTION

[0012] The embodiments of the present invention are described below according to the accompanying drawings: Figure 1 The schematic diagram of the wheelbase adjustable two-wheel suspension mechanism shown in the figure, the wheelbase adjustable two-wheel suspension, comprising: a vehicle body (10) is provided with a support shaft (101) perpendicular to the middle vertical plane of the vehicle body and a linear guide rail (102) perpendicular to the horizontal plane of the vehicle body, and a vehicle body transverse vertical plane N passing through the axis of the support shaft (101); the support shaft (101) of the vehicle body is rotatably connected to one end of two tie rods (11) and a connection point O respectively; the other ends of the two equal-length tie rods (11) are rotatably connected to one end of two longitudinal beams (14) and two connection points A and A' respectively; 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 rotatably connected to the support shaft (101) respectively; the lower ends of the two swing rods (12) are rotatably connected to one end of two rocker arms (13) and two connection points D and D' respectively; the other ends of the two equal-length rocker arms (13) are rotatably connected to the two longitudinal beams (14) and two connection points D and D' respectively. At the connection points B and B', the upper ends of the two swing arms (12) are respectively rotatably connected to one end of the two shock absorbers (16); at the two connection points E and E', the other ends of the two identical shock absorbers (16) are respectively rotatably connected to the two longitudinal beams (14); at the two connection points C and C', they are respectively located on the extension lines AB and A'B' of the longitudinal beams; the rotation axes at the rotation connection points are parallel to each other and perpendicular to the mid-vertical plane of the vehicle body, forming a motion chain with the same relative motion plane, and the relative motion plane is parallel to the mid-vertical plane of the vehicle body; 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, AC=A'C'=4DB; the other ends P and Q of the two equal-length longitudinal beams (14) are respectively rotatably connected to the two wheels (15), and the rotation axes of the two wheels (15) are perpendicular to the mid-vertical plane of the vehicle body.

[0013] The wheelbase control method of the two wheels is as follows: the slider (17) is movably connected to the linear guide rail (102) of the vehicle body, one end of the two connecting rods (18) is respectively rotatably connected to the slider (17), the two connection points F and F' are symmetrical about the plane N, the other ends of the two equal-length connecting rods (18) are respectively rotatably connected to the two rocker arms (13), the two connection points G and G' are symmetrical about the plane N, G and G' are points on the rocker arms DB and D'B' respectively, and the rotation axis at each rotation connection point is perpendicular to the mid-vertical plane of the vehicle body; the slider (17) moves along the linear guide rail (102) and has a displacement of h, the two longitudinal beams (14) move in the same relative motion plane, and ABC and A'B'C' are always collinear, the wheelbase of the two wheels (15) changes, the wheelbase S=f(h), as shown in FIG. Figure 3 As shown; when h=h1, the wheelbase of the two wheels S=S1, which is the minimum wheelbase of the vehicle, as shown Figure 4As shown; when h=h2, the wheelbase of the two wheels S=S2, which is the maximum wheelbase of the vehicle, as shown Figure 5 As shown; the slider (17) is limited to move along the linear guide rail (102), and the wheelbase 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, and the dual shock absorbers (16) are deformed in coordination to form a wheelbase adjustable dual-wheel suspension, such as Figure 2 As shown, the wheelbase-adjustable two-wheel suspension is symmetrical about plane N.

[0014] In the above-mentioned wheelbase adjustable two-wheel suspension, the movement of the slider along the linear guide is driven and controlled by a hydraulic cylinder, the cylinder end is rotationally connected to the vehicle body (10), and the piston rod output end is rotationally connected to 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 push rod or cylinder body is rotationally connected to the vehicle body (10), and the push rod or cylinder rod output end is rotationally connected to the slider (17), which is suitable for light-load vehicles.

[0015] Figure 6 The schematic diagram of the coordinated deformation principle of the dual-wheel suspension shock absorber is shown. The principle of the coordinated deformation of the dual shock absorber is as follows: when the vehicle is running, the slider (17) is limited to move along the linear guide rail (102), that is, when the given displacement is h, the wheelbase of the two wheels (15) is fixed to S, and the height of the vehicle body from the ground is H. Assuming that the force on the road surface of the P-side wheel changes and the wheel rises by ΔH, the compression shock absorber CE is deformed by Δp. At this time, the P-side longitudinal beam moves in a plane parallel to the mid-vertical plane of the vehicle body, the suspension mechanism transmits the motion, the quadrilateral kinematic chain ABDO and ODGF are deformed, DE' rotates around point O, and the other shock absorber C'E' produces a deformation Δq. The deformations Δp and Δq of the two shock absorbers jointly balance the external force, and the dual shock absorbers are deformed in a coordinated manner to maintain the longitudinal stability of the vehicle.

[0016] Figure 7 A schematic diagram of the composition of a four-wheel vehicle is shown, in which: the xy plane is the horizontal plane of the vehicle body, the yz plane is the lateral vertical plane of the vehicle body, and the xz plane is the mid-vertical plane of the vehicle body; a four-wheel vehicle comprises: two sets of wheelbase-adjustable double-wheel suspensions with the same structure and performance parameters are arranged symmetrically on the mid-vertical plane of the vehicle body according to a given vehicle wheelbase and share the same vehicle body, and the four wheels are independently driven by hub motors and differentially steered; the vehicle chassis wheelbase remains unchanged, the wheelbase is dynamically adjustable, the four wheels are loaded, the suspension mechanism is linked, the double shock absorbers are deformed in a coordinated manner, and the wheel group has good load-bearing capacity and longitudinal stability, so as to improve the ground adaptability and driving speed of the vehicle.

[0017] Figure 8The schematic diagram of the composition of a two-wheeled electric vehicle is shown. The two-wheeled electric vehicle is formed by changing the connection mode of the wheel (15) at Q of one end of the longitudinal beam (14) in the above-mentioned wheelbase adjustable two-wheel suspension, connecting a wheel (15) through a steering spindle (21) and a steering knuckle (22), and the wheel is steered, and the wheel (15) at P is driven. The method comprises: given PQ as the forward direction of the vehicle, the wheel (15) at P is used as the rear wheel of the vehicle, and a wheel mid-plane M perpendicular to the rear wheel rotation axis is set, M is parallel to the mid-vertical plane of the vehicle body, and the steering axis L of the steering spindle (21) is fixedly installed at the Q end of the longitudinal beam (14) when L is located in the rear wheel mid-plane M and the relative plane N is a given caster angle δ, such as Fig. 9 As shown, δ=22.5°; a wheel axle and a steering knuckle arm are provided on the steering knuckle (22); the steering knuckle (22) is rotatably connected to the steering main shaft (21) around L, and the axis of the wheel axle is perpendicular to L, and the steering knuckle arm is perpendicular to L; the wheel (15) is rotatably connected around the wheel axle of the steering knuckle (22) to become the front wheel of the vehicle, and the front wheel mid-plane M' passes through the steering axis L; a steering rocker arm is provided on the steering drive shaft (23), and the steering rocker arm is perpendicular to the axis of the steering drive shaft; the steering drive shaft (23) is rotatably connected to the longitudinal beam (14), and the rotation axis is parallel to L; the steering tie rod ( 24) has one end connected to the steering knuckle arm ball hinge of the steering knuckle (22) and the other end connected to the steering rocker arm ball hinge of the steering drive shaft (23), forming a parallelogram mechanism IJKT perpendicular to the L plane. The steering column (26) is rotationally connected to the vehicle body (10). The two ends of the double universal joint (25) are respectively connected to the steering drive shaft (23) and the steering column (26) through splines. The steering angle θ is input by the steering column (26) and is transmitted through the double universal joint and the parallelogram mechanism. The front wheels rotate around the steering axis L, and the vehicle steers. The rear wheels are driven by the wheel hub motor, and the vehicle travels. Fig.10 As shown in (a); two wheels are loaded, the suspension mechanism is linked, and the double shock absorbers are deformed in coordination. The transmission is transmitted by a retractable spline shaft between the double universal joints, and the wheelbase of the vehicle can be dynamically adjusted. The front and rear wheels are both equipped with motorcycle tires GB518-2007 with an arc curve section, forming a two-wheeled electric vehicle.

[0018] Where: When the steering angle θ=0, the median planes M' and M of the two wheels coincide, and the vehicle travels in a straight line. Fig.10 (c) When the steering angle θ≠0, the vehicle turns, as shown in Fig.10As shown in (b), the parallelogram mechanism maintains the symmetry of the left and right steering of the vehicle; the electric push rod adjusts the slider displacement h and the wheelbase S = f(h). The wheelbase is dynamically adjustable during the vehicle's driving process, and is transmitted through the retractable spline shaft between the double universal joints to adapt to the change of the vehicle's wheelbase; increasing the vehicle's wheelbase S can improve the vehicle's driving stability, which is suitable for two-wheeled electric vehicles in long-distance, high-speed cruising; when two-wheeled electric vehicles are driving in mountain off-road and emphasize vehicle mobility, the wheelbase S is reduced to improve the vehicle's handling performance.

Claims

1. Wheelbase adjustable two-wheel suspension, characterized by: include: The vehicle body is provided with a supporting shaft perpendicular to the mid-vertical plane of the vehicle body, a linear guide rail perpendicular to the horizontal plane of the vehicle body, and a transverse vertical plane N of the vehicle body passing through the axis of the supporting shaft. The supporting shaft of the vehicle body is rotatably connected to one end of the two tie rods, respectively, and the connection point O. The other ends of the two equal-length tie rods are rotatably connected to one end of the two longitudinal beams, respectively, and the two longitudinal beams are arranged in opposite directions. The two swing rods are arranged in an X-shaped staggered manner. The midpoints of the two equal-length swing rods are rotatably connected to the supporting shafts, respectively. The lower ends of the two swing rods are rotatably connected to one end of the two rocker arms, respectively, and the two connection points D and D'. The other ends of the two equal-length rocker arms are rotatably connected to the two longitudinal beams, respectively, and the two connection points B and B'. The upper ends of the two swing rods are rotatably connected to one end of the two shock absorbers, respectively, and the two connection points E, E', the other ends of the two identical shock absorbers are rotatably connected to the two longitudinal beams respectively, and the two connection points C and C' are respectively located on the extension lines AB and A'B' of the longitudinal beams. The rotation axes at the rotation connection points are parallel to each other and perpendicular to the mid-vertical plane of the vehicle body, forming a motion chain with the same relative motion plane, which is parallel to the mid-vertical plane of the vehicle body; 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 ends P and Q of the two longitudinal beams are rotatably connected to the two wheels respectively, and the rotation axes of the two wheels are perpendicular to the mid-vertical plane of the vehicle body; The slider is movably connected to the linear guide rail of the vehicle body, one end of the two connecting rods is rotationally connected to the sliders respectively, and the two connection points are symmetrical about plane N, the other ends of the two equal-length connecting rods are rotationally connected to the two rocker arms respectively, and the two connection points are symmetrical about plane N, and the rotation axes at each rotation connection point are perpendicular to the median vertical plane of the vehicle body; when the slider moves along the linear guide rail, the wheelbase of the two wheels changes, the slider is limited to move along the linear guide rail, the wheelbase of the two wheels is determined, the wheels rotate relative to the longitudinal beam, the vehicle travels, the two wheels are loaded, the suspension mechanism is linked, and the double shock absorbers are deformed in a coordinated manner.

2. The wheelbase adjustable two-wheel suspension according to claim 1, characterized in that: The movement of the sliding block along the linear guide rail is driven and controlled by a hydraulic cylinder.

3. The wheelbase adjustable two-wheel suspension according to claim 1, characterized in that: The movement of the slide block along the linear guide rail is driven and controlled by an electric push rod or an electric cylinder.

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

5. A two-wheeled electric vehicle, characterized in that: include: In the wheelbase adjustable two-wheel suspension according to claim 1, PQ is given as the forward direction of the vehicle, the wheel at P is used as the rear wheel of the vehicle, a wheel mid-plane M perpendicular to the rear wheel rotation axis and a steering axis L of the steering spindle are provided, and when L is located in the rear wheel mid-plane M and the relative plane N is a given caster angle, the steering spindle is fixedly installed at the Q end of the longitudinal beam; a wheel axle and a steering knuckle arm are provided on the steering knuckle, the steering knuckle is connected to the steering spindle rotationally around L, and the axis of the wheel axle is perpendicular to L, the wheel is connected to the wheel axle rotationally around the steering knuckle to become the front wheel of the vehicle, and the mid-plane of the front wheel passes through the steering axis L; a steering rocker arm is provided on the steering drive shaft, and the steering drive shaft is connected to the longitudinal beam. The beam is rotatably connected and its rotation axis is parallel to L. One end of the steering rod is connected to the steering knuckle arm ball hinge of the steering knuckle, and the other end is connected to the steering rocker arm ball hinge of the steering drive shaft, forming a parallelogram mechanism perpendicular to the L plane. The steering column is rotatably connected to the vehicle body, and the two ends of the double universal joint are respectively connected to the steering drive shaft and the steering column through splines; the steering angle is input by the steering column and transmitted through the double universal joint and the parallelogram mechanism, the front wheel rotates around the steering axis L and the vehicle steers, the rear wheel is driven and the vehicle travels, the two wheels are loaded, the suspension mechanism is linked, the double shock absorbers are deformed in coordination, the telescopic spline shaft transmission between the double universal joints can adapt to the dynamic adjustment of the wheelbase of the two-wheeled vehicle.

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