CN211195760U - Vehicle suspension system and vehicle with same - Google Patents

Abstract

The utility model discloses a vehicle suspension system and vehicle that has it, vehicle suspension system includes: a vehicle body; an integrated motor drive axle and wheel assembly; one end of the first swing rod is hinged with the vehicle body; one end of the second swing rod is hinged with the integrated motor drive axle and the wheel assembly; one end of the prepressing spring shock absorber is hinged with the vehicle body, and the other end of the prepressing spring shock absorber, the other end of the first cover plate and the other end of the second swing rod are hinged in a concurrent mode. According to the utility model discloses vehicle suspension system has both increased the riding comfort, and cost and energy consumption have been reduced again, have guaranteed the mileage of driving a vehicle.

Description

Vehicle suspension system and vehicle with same

Technical Field

The utility model belongs to the technical field of the vehicle technique and specifically relates to a vehicle suspension system and vehicle that has it are related to.

Background

The related art integrated motor drive axle of a vehicle (e.g., an electric vehicle) employs a driving motor integrated with the drive axle to directly drive the driving wheels of the vehicle, as shown in fig. 1 to 2, so as to simplify the power transmission manner in which the engine or the driving motor of the vehicle transmits power to the driving wheels through a propeller shaft. However, as the driving motor is arranged on the drive axle, the mass M2 of the motor is increased, so that the unsprung mass is increased, the relative dynamic load (namely the ratio of the dynamic load to the static load) of the driving wheel assembly is increased, and on one hand, the amplitude in the vertical direction is increased during the running of the whole vehicle, the riding comfort is poor, and the smoothness of the whole vehicle is reduced; on the other hand, the probability of instantaneous jumping off the road surface of the wheel T is increased, and the adhesion performance of the wheel T is affected.

There are generally two ways to solve the above problems in the related art:

one is to use an elastic connection type suspension of the integrated motor-driven axle and the vehicle body, as shown in fig. 1, to reduce the mass imbalance of the impact force in the vertical direction and the mass center of the rear mounting structure moving backward by adding a damping device 700' (e.g., a shock absorber) between the integrated motor-driven axle and the vehicle body. However, the weight of the driving motor is increased, so that the relative dynamic load of the driving wheel assembly cannot be relieved;

secondly, the integrated motor drive axle adopts an active suspension to solve the problems of large amplitude in the vertical direction of the vehicle body, poor comfort and the like, as shown in fig. 2. However, the active force generator 200' is used for attenuating the unsprung mass, and larger attenuation energy is needed, so that the energy consumption of the whole vehicle is increased, and the driving mileage is reduced. In addition, with the active suspension, the addition of the parts such as the ECU (electronic control Unit) 300 ', the active force generator 400 ', the power input device 500 ', and the like leads to an increase in manufacturing cost and maintenance cost.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a vehicle suspension system, this vehicle suspension system had both increased the riding comfort, and the mileage of driving has been guaranteed to cost and energy consumption again.

The utility model discloses still provide a vehicle that has above-mentioned vehicle suspension system.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a vehicle suspension system, comprising: a vehicle body; an integrated motor drive axle and wheel assembly; one end of the first swing rod is hinged with the vehicle body; one end of the second swing rod is hinged with the integrated motor drive axle and the wheel assembly; one end of the prepressing spring shock absorber is hinged with the vehicle body, and the other end of the prepressing spring shock absorber, the other end of the first cover plate and the other end of the second swing rod are hinged in a concurrent mode.

According to the utility model discloses vehicle suspension system, the one end through first pendulum rod is articulated with the automobile body, and the one end and the integrated form motor-drive axle and the wheel assembly of first pendulum rod are articulated. One end of the prepressing spring shock absorber is hinged with the vehicle body, the other end of the prepressing spring shock absorber, the other end of the first swing rod and the other end of the second swing rod are hinged at the same point, when the motion track of the wheel center of the rear driving wheel is shown in figure 4, the linear relation between the compression force and the compression amount of a common spring is changed into the curve relation of variable compression rigidity of the prepressing spring shock absorber, as shown in figure 5, the small compression rigidity in small compression amount and the large compression rigidity in large compression amount are realized, the dive of the vehicle body is reduced, the posture of the vehicle body is kept, and the upward dynamic load in jumping on unsprung mass (namely mass of an axle, wheels and the like and mass of a motor) is reduced.

Through the arrangement of the first swing rod, the second swing rod and the pre-pressing type spring shock absorber, part of unsprung mass is transferred to the sprung mass for damping, and compared with an integrated motor drive axle and vehicle body elastic connection type suspension in the related technology, the driving smoothness, the wheel grounding adhesion safety and the riding comfort are improved in principle; compared with the active suspension of the motor integrated direct drive axle in the related technology, the active suspension of the motor integrated direct drive axle has the advantages that the driving smoothness and riding comfort are met, meanwhile, the manufacturing and maintenance costs and energy consumption are reduced, and the driving mileage of a vehicle is increased.

In addition, according to the utility model discloses vehicle suspension system can also have following technical characterstic:

according to some embodiments of the present invention, when the pre-stressed spring damper is in the initial state, the pre-stressed spring damper is not stretchable and the spring therein is in a compressed state.

According to some embodiments of the utility model, first pendulum rod is by lower supreme to the locomotive direction slope of automobile body extends, pre-compaction formula spring damper is by lower supreme to the locomotive direction slope of automobile body extends, the second pendulum rod one end is located first pendulum rod with pre-compaction formula spring damper's rear.

Further, the one end of the pre-stressed spring damper is higher than the one end of the first swing link.

According to some embodiments of the present invention, the pre-compression spring damper comprises: the piston device comprises a cylinder, a piston cavity is limited in the cylinder, a through hole communicated with the piston cavity is formed in the top wall of the cylinder, and oil is filled in the piston cavity; the piston rod extends downwards into the piston cavity through the through hole, a piston head is formed at the lower end of the piston rod, and the cross sectional area of the piston head is larger than that of the through hole; the upper mounting lifting lug is connected to the upper end of the piston rod, and the lower mounting lifting lug is connected to the lower end of the cylinder; the spring is sleeved on the piston rod and positioned between the upper mounting lifting lug and the barrel body; when the pre-stressed spring shock absorber is in an initial state, the spring is compressed between the upper mounting lifting lug and the cylinder body, and the piston head upwards abuts against the top wall of the cylinder body.

Further, the periphery screw thread of barrel has lock nut, the spring is located go up the installation lug with lock nut between.

According to some embodiments of the present invention, the piston head is constructed as a unitary structure without oil via holes.

According to some embodiments of the present invention, the upper mounting lug is configured with an upper mounting hole, an upper bushing is arranged in the upper mounting hole, and the upper mounting lug is hinged to the vehicle body by an upper fastening piece passing through the upper bushing; the lower mounting lifting lug is provided with a lower mounting hole, a lower bushing is arranged in the lower mounting hole, and the lower mounting lifting lug is hinged to the integrated electric drive axle and wheel assembly through a lower fastener penetrating through the lower bushing.

According to some embodiments of the present invention, the center of mass of the integrated electric drive axle and wheel assembly is biased toward the front, and the first swing link, the second swing link and the pre-stressed spring damper are disposed at the front of the integrated electric drive axle and wheel assembly; or the mass center of the integrated electric drive axle and wheel assembly is deviated to the rear part, and the first swing rod, the second swing rod and the pre-stressed spring damper are arranged at the rear part of the integrated electric drive axle and wheel assembly; or the center of mass of the integrated electric drive axle and wheel assembly is located at the center of the front and back direction, and the first swing rod, the second swing rod and the pre-stressed spring damper are arranged at the center of the front and back direction of the integrated electric drive axle and wheel assembly.

According to some embodiments of the present invention, the vehicle suspension system further comprises: the steel plate springs are respectively connected with the vehicle body, the integrated electric drive axle and the wheel assembly; and one end of the damper is connected with the vehicle body, and the other end of the damper is connected with the integrated electric drive axle and the wheel assembly.

According to the utility model discloses a two aspect embodiments provide a vehicle, the vehicle includes according to the utility model discloses the above-mentioned vehicle suspension system of embodiment.

According to the utility model discloses vehicle, through according to the utility model discloses above-mentioned vehicle suspension system has the driving steadily, cost and energy consumption low and go advantages such as mileage is long.

Drawings

The above advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic diagram of a suspension in an elastic connection manner of an integrated motor drive axle and a vehicle body in the prior art.

Fig. 2 is a schematic diagram of a prior art integrated motor drive axle employing active suspension.

Fig. 3 is a schematic diagram of a vehicle suspension system according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a wheel center locus of a vehicle suspension system according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of the relationship between the compression force and the compression amount of the pre-stressed spring damper of the vehicle suspension system according to the embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a pre-stressed spring damper of a vehicle suspension system according to an embodiment of the present invention.

Fig. 7 is a schematic diagram of a movement locus of a swing link mechanism of a vehicle suspension system according to an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a vehicle suspension system according to an embodiment of the present invention.

Reference numerals:

a vehicle suspension system 1,

A vehicle body 100,

An integrated motor drive axle and wheel assembly 200,

A first swing link 300,

A second swing link 400,

The pre-stressed spring shock absorber 500, the cylinder 510, the piston chamber 511, the through hole 512, the oil 513, the piston rod 520, the piston head 521, the upper mounting lug 530, the upper mounting hole 531, the upper bushing 532, the lower mounting lug 540, the lower mounting hole 541, the lower bushing 542, the spring 550, the lock nut 560, the spring rod, the piston rod and the piston head,

A steel plate spring 600,

A damper 700,

Mass M1 such as axle and wheel, motor mass M2, sprung mass M3, wheel T.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, "a plurality" means two or more, and "a plurality" means one or more.

A vehicle suspension system 1 according to an embodiment of the present invention is described below with reference to the drawings. The vehicle suspension system 1 may be used for an electric automobile, and may also be used for other types of vehicles.

As shown in fig. 3 to 8, the vehicle suspension system 1 includes a vehicle body 100, an integrated motor-drive axle and wheel assembly 200, a first swing link 300, a second swing link 400, and a pre-stressed spring damper 500. The integrated motor-drive axle and wheel assembly 200 may include components such as a drive motor, a transmission reduction gear, a planetary differential gear, a bearing, a transmission half-shaft, and a drive axle housing, wherein drive wheels are mounted at both ends of the drive axle.

One end of the first swing link 300 is hinged to the vehicle body 100, and one end of the second swing link 400 is hinged to the integrated motor-driven axle and wheel assembly 200. One end of the pre-stressed spring damper 500 is hinged to the vehicle body 100, and the other end of the pre-stressed spring damper 500, the other end of the first swing link 300 and the other end of the second swing link 400 are hinged at the same point.

For example, the upper end of the first swing link 300 is hinged to the vehicle body 100, the lower end of the second swing link 400 is hinged to the integrated motor-driven axle and wheel assembly 200, the upper end of the pre-stressed spring damper 500 is hinged to the vehicle body 100, and the lower end of the pre-stressed spring damper 500 and the lower end of the first swing link 300 are hinged to the upper end of the second swing link 400 at the same point.

According to the utility model discloses vehicle suspension system 1, the one end through first pendulum rod 300 is articulated with automobile body 100, and the one end and the integrated form motor-drive axle of second pendulum rod 400 and wheel assembly 200 are articulated. One end of the pre-stressed spring damper 500 is hinged to the vehicle body 100, the other end of the pre-stressed spring damper 500, the other end of the first swing link 300 and the other end of the second swing link 400 are hinged in a point-sharing manner, when the movement locus of the wheel center of the rear driving wheel is shown in fig. 4, the linear relation between the compression force and the compression amount of a common spring is changed into the curve relation of the variable compression stiffness of the pre-stressed spring damper 500, as shown in fig. 5, the small compression stiffness at the small compression amount and the large compression stiffness at the large compression amount are realized, the dive of the vehicle body 100 is reduced, the posture of the vehicle body 100 is maintained, and the upward dynamic load when the masses M1 such as the axle and the wheel and the motor mass M2 jump is reduced.

Through the arrangement of the first swing rod 300, the second swing rod 400 and the pre-stressed spring shock absorber 500, part of unsprung mass is transferred to sprung mass for damping, and compared with an integrated motor drive axle and vehicle body elastic connection type suspension in the related art, the driving smoothness, wheel grounding adhesion safety and riding comfort are improved in principle; compared with the active suspension of the motor integrated direct drive axle in the related technology, the active suspension of the motor integrated direct drive axle has the advantages that the driving smoothness and riding comfort are met, meanwhile, the manufacturing and maintenance costs and energy consumption are reduced, and the driving mileage of a vehicle is increased.

According to the utility model discloses vehicle suspension system 1 has both increased the riding comfort, and cost and energy consumption have been reduced again, have guaranteed the mileage of driving a vehicle.

In some examples of the present invention, when the pre-stressed spring damper 500 is in the initial state, the pre-stressed spring damper 500 is not stretchable, and the spring 550 in the pre-stressed spring damper 500 is in a compressed state, which is understood to mean that when the pre-stressed spring damper 500 is in the initial state, the pre-stressed spring damper 500 is in a natural state when not being acted by an external force.

According to some embodiments of the present invention, as shown in fig. 7, the first swing link 300 extends forward from bottom to top, the pre-stressed spring damper 500 extends forward from bottom to top, and the one end of the second swing link 400 is located behind the first swing link 300 and the pre-stressed spring damper 500. Wherein the one end of the pre-stressed spring damper 500 is higher than the one end of the first swing link 300.

Here, it is understood that the "front" direction refers to a direction toward the front of the vehicle body 100.

In this way, when the first swing link 300 is located at the solid line position and the second swing link 400 is located at the solid line position, the partial motor mass M2 of the transaxle can be transferred to the sprung mass M3, and the vehicle body 100 can bear the weight of the partial motor transaxle through the first swing link 300 and the second swing link 400. Thus, the downward dynamic load of the wheel T during the downhill jump can be reduced. The running smoothness, the wheel grounding adhesion safety and the riding comfort are improved.

According to some embodiments of the present invention, as shown in fig. 6, pre-compression spring damper 500 includes a cylinder 510, a piston rod 520, an upper mounting lug 530, a lower mounting lug 540, and a spring 550.

A piston cavity 511 is defined in the cylinder 510, a through hole 512 communicated with the piston cavity 511 is formed in the top wall of the cylinder 510, and oil 513 is filled in the piston cavity 511. The piston rod 520 extends downward into the piston chamber 511 through the through hole 512, and the lower end of the piston rod 520 is configured with a piston head 521, and the cross-sectional area of the piston head 521 is larger than that of the through hole 512. The upper mounting lug 530 is coupled to the upper end of the piston rod 520, and the lower mounting lug 540 is coupled to the lower end of the cylinder 510. The spring 550 is sleeved on the piston rod 520 and located between the upper mounting lug 530 and the cylinder 510.

In the initial state of the pre-stressed spring damper 500, the spring 550 is compressed between the upper mounting lug 530 and the cylinder 510, and the piston head 521 abuts against the top wall of the cylinder 510.

Further, the outer circumference of the cylinder 510 is screw-fitted with a lock nut 560, and the spring 550 is located between the upper mounting lug 530 and the lock nut 560.

In this way, the piston head 521 is limited to prevent the piston rod 520 from coming out from above the piston chamber 511, and to ensure that the pre-compression spring damper 500 is not extended in the initial state. The piston chamber 511 is filled with oil 513, which can buffer the vibration of the piston head 521 and the impact during the limit. Further, the spring 550 may be used to generate a compression reaction force when it is compressed.

According to some embodiments of the present invention, as shown in fig. 6, the piston head 521 is constructed as a unitary structure without oil passing holes. This ensures that the oil 513 is located in the piston chamber 511, ensuring that the oil 513 acts as a cushion for the piston head 521.

According to some embodiments of the present invention, as shown in fig. 6, the upper mounting lug 530 is configured with an upper mounting hole 531, an upper bushing 532 is provided in the upper mounting hole 531, and the upper mounting lug 530 is hinged to the vehicle body 100 through an upper fastening member passing through the upper bushing 532. The lower mounting lug 540 is configured with a lower mounting hole 541, a lower bushing 542 is disposed in the lower mounting lug 540, and the lower mounting lug 540 is hinged to the integrated motor-drive axle and wheel assembly 200 by a lower fastener penetrating through the lower bushing 542.

In this way, the upper mounting hole 531 and the lower mounting hole 541 are provided to ensure the connection strength between the pre-stressed spring damper 500 and the vehicle body 100 and the integrated motor-driven axle and wheel assembly 200. The prepressing type spring shock absorber 500 can be ensured to rotate relative to the vehicle body 100 and the integrated motor drive axle and wheel assembly 200 through the hinged connection, and the connection reliability cannot be influenced. The upper bushing 532 and the lower bushing 542 are arranged to prevent the upper mounting hole 531 and the lower mounting lug 540 from being damaged due to friction, which affects the use.

According to some embodiments of the present invention, as shown in fig. 3 and 8, the center of mass of the integrated motor-driven axle and wheel assembly 200 is biased toward the front, and the first swing link 300, the second swing link 400 and the pre-stressed spring damper 500 are disposed at the front of the integrated motor-driven axle and wheel assembly 200;

or the mass center of the integrated motor drive axle and wheel assembly 200 is deviated to the rear part, and the first swing link 300, the second swing link 400 and the pre-stressed spring damper 500 are arranged at the rear part of the integrated motor drive axle and wheel assembly 200;

or the center of mass of the integrated motor-driven axle and wheel assembly 200 is located at the center in the front-rear direction, and the first swing link 300, the second swing link 400 and the pre-stressed spring damper 500 are located at the center in the front-rear direction of the integrated motor-driven axle and wheel assembly 200.

Thus, the first swing link 300, the second swing link 400 and the pre-stressed spring damper 500 can be set according to different conditions of the mass center of the integrated motor-driven axle and wheel assembly 200, so that stress balance is performed, and universality is improved.

According to some embodiments of the present invention, as shown in fig. 3 and 8, the vehicle suspension system 1 further includes a leaf spring 600 and a damper 700. Wherein the leaf spring 600 may be replaced by an air spring and the damper 700 may be a shock absorber.

Leaf springs 600 are connected to body 100 and integrated motor-drive axle and wheel assembly 200, respectively. Damper 700 is connected at one end to body 100 and at the other end to integrated motor-drive axle and wheel assembly 200.

Specifically, leaf spring 600 is a member for transmitting torque between integrated motor-driven axle and wheel assembly 200 and vehicle body 100, and damper 700 is a member for damping between integrated motor-driven axle and wheel assembly 200 and vehicle body 100. Thus, the vehicle suspension system 1 further increases ride comfort, wheel attachment safety, and ride comfort through the leaf spring 600 and the damper 700.

The following describes the movement of the rocker mechanism during the travel of the vehicle:

the swing link structure includes a first swing link 300, a second swing link 400, and a pre-stressed spring damper 500.

When the integrated motor-driven axle and wheel assembly 200 is located at the initial position, that is, the first swing link 300 is located at the solid line position, and the second swing link 400 is located at the solid line position (as shown in fig. 7), at this time, the tire is unloaded, the pre-stressed spring damper 500 is in the state of initial pre-compression (that is, not subjected to external force) of the spring 550, and since the pre-stressed spring damper 500 is not stretchable when being in the initial state, the position of the rear drive axle can be fixed, so that the rear drive axle does not continue to move downward. Wherein, the impact force of the piston head 521 on the top wall of the cylinder 510 can be reduced due to the oil 513 in the piston chamber 511. Thus, the downward partial dynamic load of the integrated motor drive axle and wheel assembly 200 is reduced, and the weight of a partial rear drive axle is transferred.

When the integrated motor-driven axle and wheel assembly 200 moves as shown in fig. 4, the first swing link 300 moves from the solid line position to the dotted line position, the second swing link 400 moves from the solid line position to the dotted line position, and the pre-stressed spring damper 500 moves from the solid line position to the dotted line position, as shown in fig. 7, the length of the pre-stressed spring damper 500 is shortened, and pressure is formed on the second swing link 400, and due to the lever action of the first swing link 300 and the second swing link 400, the compression force of the pre-stressed spring damper 500 is always smaller and rapidly increased, so that if the compression force of the pre-stressed spring damper 500 is small, the suspension system does not become too stiff; if the compression force of the pre-stressed spring shock absorber 500 is rapidly increased, the vehicle body 100 cannot be significantly braked and dived down and the dynamic load of the upward wheel cannot be too large due to the compression force of the spring 500 under the working conditions that the braking or the road surface is seriously fluctuated and the suspension is greatly compressed.

When the first swing link 300 is located at the position of the solid line and the position of the dotted line, the second swing link 400 is located at the position of the solid line and the position of the dotted line, and the movement trajectory line of the swing link mechanism is always located at the movement trajectory line which avoids the wheel centers of the wheels in the vertical direction and the horizontal direction; in addition, because the oil in the lower cylinder of the pre-stressed spring shock absorber 500 has a damping and buffering effect on the head of the piston rod, the high-frequency vibration generated by the rotation of the motor and the unevenness of the road surface can be prevented from being transmitted to the vehicle body 100 by the swing rod mechanism.

As shown in fig. 7, when the pendulum mechanism is at the initial position, the pre-stressed spring damper 500 is in a pre-stressed state without external force, and the pendulum mechanism is in a "semi-floating" state without transmitting high-frequency vibration, so that the pendulum mechanism can be called as a "semi-floating" pendulum mechanism. The integrated motor drive axle and wheel assembly 200 and the vehicle body 100 adopt a semi-floating connection form through the first swing link 300, the second swing link 400, the pre-stressed spring shock absorber 500, the steel plate spring 600 and the damper 700, so that the driving smoothness, the wheel attachment safety and the riding comfort are improved, and the manufacturing and maintenance cost and the energy consumption are reduced.

As will be appreciated by those skilled in the art, the "semi-floating" suspension connection method of the vehicle can be applied to other types of electric vehicles, such as hubs, wheel-side driving modes, etc.

The following describes a vehicle according to an embodiment of the present invention, which may be an electric automobile, an electric passenger car, or the like, according to the accompanying drawings.

According to the utility model discloses the vehicle of implementing includes according to the utility model discloses vehicle suspension system 1.

According to the utility model discloses vehicle, through according to the utility model discloses vehicle suspension system 1 has the driving steadily, cost and energy consumption low and go advantages such as mileage is long.

Other configurations of vehicles according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the terms "particular embodiment," "particular example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A vehicle suspension system, comprising:

a vehicle body;

an integrated motor drive axle and wheel assembly;

one end of the first swing rod is hinged with the vehicle body;

one end of the second swing rod is hinged with the integrated motor drive axle and the wheel assembly;

one end of the prepressing spring shock absorber is hinged with the vehicle body, and the other end of the prepressing spring shock absorber, the other end of the first swing rod and the other end of the second swing rod are hinged at the same point.

2. A vehicle suspension system according to claim 1, wherein said pre-stressed spring damper is non-extensible and the spring therein is in a compressed state when said pre-stressed spring damper is in an initial state.

3. The vehicle suspension system according to claim 1, wherein the first swing link extends obliquely from bottom to top in a direction toward a front of the vehicle body, the pre-stressed spring damper extends obliquely from bottom to top in the direction toward the front of the vehicle body, and the one end of the second swing link is located behind the first swing link and the pre-stressed spring damper.

4. The vehicle suspension system according to claim 1, wherein the pre-stressed spring shock absorber comprises:

the piston device comprises a cylinder, a piston cavity is limited in the cylinder, a through hole communicated with the piston cavity is formed in the top wall of the cylinder, and oil is filled in the piston cavity;

the piston rod extends downwards into the piston cavity through the through hole, a piston head is formed at the lower end of the piston rod, and the cross sectional area of the piston head is larger than that of the through hole;

the upper mounting lifting lug is connected to the upper end of the piston rod, and the lower mounting lifting lug is connected to the lower end of the cylinder;

the spring is sleeved on the piston rod and positioned between the upper mounting lifting lug and the barrel body;

when the pre-stressed spring shock absorber is in an initial state, the spring is compressed between the upper mounting lifting lug and the cylinder body, and the piston head upwards abuts against the top wall of the cylinder body.

5. A vehicle suspension system according to claim 4, wherein the outer periphery of the barrel is screw-fitted with a lock nut, the spring being located between the upper mounting lug and the lock nut.

6. The vehicle suspension system of claim 4, wherein the piston head is constructed as a unitary structure devoid of oil through-holes.

7. A vehicle suspension system according to claim 4, wherein said upper mounting lug is configured with an upper mounting aperture, said upper mounting aperture having an upper bushing disposed therein, said upper mounting lug being hingedly connected to said vehicle body by an upper fastener passing through said upper bushing;

the lower mounting lifting lug is provided with a lower mounting hole, a lower bushing is arranged in the lower mounting hole, and the lower mounting lifting lug is hinged to the integrated electric drive axle and wheel assembly through a lower fastener penetrating through the lower bushing.

8. The vehicle suspension system according to claim 1 wherein the center of mass of said integrated electric transaxle and wheel assembly is biased toward the front, and said first rocker arm, said second rocker arm and said precompressed spring damper are disposed in front of said integrated electric transaxle and wheel assembly; or

The center of mass of the integrated electric drive axle and wheel assembly is deviated to the rear part, and the first swing rod, the second swing rod and the pre-stressed spring damper are arranged at the rear part of the integrated electric drive axle and wheel assembly; or

The center of mass of the integrated electric drive axle and wheel assembly is located at the center of the front and back direction, and the first swing rod, the second swing rod and the pre-stressed spring damper are arranged at the center of the front and back direction of the integrated electric drive axle and wheel assembly.

9. The vehicle suspension system according to any one of claims 1-8, further comprising:

the steel plate springs are respectively connected with the vehicle body, the integrated electric drive axle and the wheel assembly;

and one end of the damper is connected with the vehicle body, and the other end of the damper is connected with the integrated electric drive axle and the wheel assembly.

10. A vehicle comprising a vehicle suspension system according to any one of claims 1 to 9.

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