CN201102453Y

CN201102453Y - Automotive rear suspension system

Info

Publication number: CN201102453Y
Application number: CNU2007200752507U
Authority: CN
Inventors: 沈伟; 王东; 陆伟领; 方恩
Original assignee: SAIC Motor Corp Ltd
Current assignee: SAIC Motor Corp Ltd
Priority date: 2007-09-29
Filing date: 2007-09-29
Publication date: 2008-08-20
Anticipated expiration: 2017-09-29

Abstract

A rear suspension system of a vehicle is provided, which has the advantage of compact structure and can improve the handing stability and the ride comfort of the vehicle. The rear suspension system includes a spiral spring and a shock absorber which are connected with the body of the vehicle and also includes a rear underframe which is connected with the body of the vehicle. The rear underframe is equipped with a central stent and two connecting stents which extend symmetrically from two ends of the central stent. The rear suspension system also includes two rear up-swing arms, two rear vertical-swing arms and two rear down-swing arms. The two rear up-swing arms, the two rear vertical-swing arms and the two rear down-swing arms are respectively arranged on two sides of the rear underframe symmetrically. Two ends of every rear up-swing arm are respectively equipped with the central stent and one end of every rear vertical-swing arm on one side of the rear underframe. The rear down-swing arms are arranged under the rear up-swing arms and two ends of every rear down-swing arm are connected with the central stent and one end of every rear vertical-swing arm. The other ends of the rear vertical-swing arms are connected with one connecting stent and one ends of the rear vertical-swing arms are connected with hub core shafts of wheels of the vehicle.

Description

Rear suspension system for a motor vehicle

Technical Field

The utility model relates to an automobile chassis, the more specifically rear suspension system of car that says so.

Background

The four-wheel positioning adjustment parameters of the suspension mainly comprise camber angle, toe angle and the like, and the characteristic parameters have important influences on the stable driving performance and curve control characteristics of the vehicle. The rear suspension of the current domestic automobile generally takes a semi-independent suspension as a main part, the structure is simple, the deformation of a rubber bushing arranged on the suspension is mainly utilized to achieve a certain variable toe angle and a follow-up steering function, but the primary task of the rubber bushing still plays a role in connecting suspension and isolating vibration, and therefore the rigidity cannot be too low. This poses limitations on variable toe and follow-up steering, where only a small angle can be achieved.

In addition, the rear suspension of such a conventional semi-independent suspension is generally coaxially arranged with respect to the arrangement of the shock absorber and the coil spring, i.e., the upper end of the coil spring is mounted in the sprung portion of the vehicle frame, and the lower portion thereof is supported on the unsprung portion of the shock absorber housing, in the form of a coil spring "fitted" over the outer housing of the tube shock absorber, which makes such an arrangement troublesome in maintenance.

In addition, the arrangement form of the suspension has a great influence on the space of the trunk and the arrangement space of the oil tank of the vehicle, and many automobiles have to reduce the arrangement space in order to meet the vehicle performance.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a compact structure can improve the operating stability and take the travelling comfort and easy maintenance's rear suspension system of car yet.

In order to achieve the above object, the present invention provides a rear suspension system for a vehicle, including a coil spring and a shock absorber connected to a vehicle body of the vehicle, which is characterized by further comprising: the rear auxiliary frame is connected with the body of the automobile and is provided with a central support and two connecting supports symmetrically extending out of two ends of the central support; two rear upper swing arms, two rear longitudinal swing arms, and two rear lower swing arms; the two rear upper swing arms, the rear longitudinal swing arm and the rear lower swing arm are respectively and symmetrically arranged on two sides of the rear auxiliary frame; the utility model discloses a rear auxiliary frame, including back sub vehicle frame, back lower swing arm, back upper swing arm, back lower swing arm, back.

According to the above mentioned idea of the present invention, preferably, the rear upper swing arm is connected to the central support of the rear sub-frame through an eccentric bolt, so as to adjust the camber angle of the rear suspension system.

Preferably, the rear upper swing arm further includes a stiffener, an inner connecting ball joint, and a bushing.

According to the above mentioned conception of the utility model, preferably, the swing arm is made of high strength steel on the back, the strengthening rib welding is in on the swing arm on the back, and its one end pass through the internal connection ball joint assemble in on the back sub vehicle frame, its other end pass through the bush connect in on the back vertical swing arm.

According to the above mentioned conception of the utility model, preferably, the back is indulged the swing arm and is had a back and indulge the swing arm bush, the both ends of indulging the swing arm bush in back are provided with the slant adjustment tank, just the back is indulged the swing arm and is passed through the back is indulged the swing arm bush the slant adjustment tank with the linking bridge of back sub vehicle frame is connected.

Preferably, the shock absorber is mounted on the rear longitudinal swing arm and one end of the shock absorber is connected to the vehicle body, and the coil spring is mounted between the vehicle body and the rear lower swing arm.

Preferably, the rear lower swing arm is formed with a circular protrusion, the coil spring has an upper vibration isolator and a lower vibration isolator, the lower portion of the lower vibration isolator is formed with a groove, and the groove of the lower vibration isolator is connected to the circular protrusion of the rear lower swing arm.

According to the above mentioned idea of the utility model, preferably, be formed with four mounting points on the back sub vehicle frame, back sub vehicle frame passes through the mounting point links to each other with the automobile body of car, two the mounting point form in the free end of linking bridge, two in addition the mounting point form in the arm middle part of linking bridge.

As above the utility model discloses a rear suspension system of car adopts the many link mechanism in space of being constituteed by swing arm, back sub vehicle frame, back lower swing arm and the back vertical swing arm on the back, make full use of the inner space of automobile body, the maintenance of the rear suspension system of being convenient for. Through the configuration of the multi-link mechanism, the camber angle and the toe-in angle can be conveniently adjusted, the rear wheels can obtain a certain steering angle, and the optimization of high camber rigidity and left-right flexible deflection can be realized, so that the tire grip is exerted to the maximum extent, the running control stability of the whole vehicle is improved, the response performance during changing a driving route is improved, the up-down stroke track of the tire is improved, and the riding comfort is increased. In addition, the rear shock absorber and the coil spring can be independently arranged in parallel, so that the compactness of the structure is increased, a lower and wider trunk floor of the vehicle can be provided, the space of the trunk is maximized, and a larger arrangement space is provided for the fuel tank of the vehicle.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide a more clear understanding of the present invention and to provide further explanation.

Drawings

To further illustrate the above objects, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings, which illustrate embodiments of the present invention and together with the description, serve to explain the principles of the present invention and in which:

fig. 1 is a schematic perspective view of a rear suspension system of an automobile according to the present invention;

fig. 2 is an exploded schematic view of a rear suspension system of an automobile according to the present invention;

FIG. 3 is a perspective view of the rear longitudinal swing arm of FIG. 2;

FIG. 4a is a front view of the rear subframe of FIG. 2;

FIG. 4b is a front view of the rear subframe of FIG. 4 a.

Detailed Description

Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Further, although the terms used in the present invention are selected from publicly known and used terms, some of the terms mentioned in the description of the present invention are selected by the applicant at his discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present invention is understood, not simply by the actual terms used but by the meaning of each term lying within.

Fig. 1 is a schematic perspective view of a rear suspension system of an automobile according to the present invention, and fig. 2 is an exploded schematic view of the rear suspension system of the automobile, for convenience, except that the rear subframe 26 and the rear stabilizer bar 17 are single components, and other components have corresponding components in the left side portion, and fig. 2 only shows a schematic view of the left half portion of the rear suspension system of fig. 1, and omits a symmetrical portion structure of the right side thereof.

As shown in fig. 1 and 2, the rear sub frame has a center bracket 26a, connecting

portions

26b and 26c formed symmetrically at both ends of the center bracket 26a, and two connecting

brackets

26d and 26e protruding symmetrically at both ends of the center bracket 26 a; the rear sub-frame 26 is provided with four mounting points 23a-23d supported by being connected to the vehicle body by means of bolts 25, wherein the

mounting points

23a and 23d are provided at free ends of connecting

brackets

26d and 26e, respectively, and the

mounting points

23b and 23c are provided at intermediate portions of arm portions of the connecting

brackets

26d and 26e, respectively, so that the rear sub-frame 26 can control the roll of the vehicle body caused by the lateral force to attenuate the road noise and provide mounting positions of all suspension components.

One end of the rear upper swing arm 5 is connected to a rear sub frame 26 through an eccentric bolt 13 and a washer 12, a ball joint 11 is provided at the end, the eccentric bolt 13 passes through the ball joint 11 to be connected to a connecting portion 26b of a center bracket 26a assembled to the rear sub frame 26, and is tightened with a nut 10 in cooperation with the eccentric bolt 13, so that the rear upper swing arm 5 is not detached from the rear sub frame 26 and can be rotated with respect to the connecting portion 26b, and the camber angle of the suspension can be easily adjusted by adjusting the placement position of the head of the eccentric bolt 13 by rotation adjustment; in addition, the rear upper swing arm 5 is connected with one end of the rear longitudinal swing arm 8 through a bolt 4 and a washer 3, namely a bush 2 is arranged at the other end of the rear upper swing arm 5, and the bolt 4 penetrates through the bush 2 and is screwed by a nut 1. In the present embodiment, the rear upper swing arm 5 is preferably made of high-strength steel, and the reinforcing rib 5a welded on the upper side can greatly improve the strength of the part.

Similarly, one end of the rear lower swing arm 33 is provided with a bush 27, the bolt 28 connects the one end of the rear lower swing arm 33 with one end of the center frame 26a of the rear subframe 26 through the bush 27, the other end of the rear lower swing arm 33 is provided with a ball joint 35, the bolt 34 passes through the ball joint 35 and is screwed with a nut 36, so that the rear lower swing arm 33 is connected with the one end of the rear longitudinal swing arm 8, and it should be noted that the rear lower swing arm 33 is not separated from the rear subframe 26 and the rear longitudinal swing arm 8 and can relatively rotate. In the present embodiment, the rear lower swing arm 33 is preferably formed by high-strength steel punching.

Referring to fig. 3, 4a and 4b, a rear swing arm bushing 7 is disposed at the other end of the rear longitudinal swing arm 8, a pair of inclined adjustment grooves 9a is formed at both ends of the rear swing arm bushing 7, the free end of the connecting bracket 26d of the rear subframe 26 is connected to the other end of the rear longitudinal swing arm 8 by passing through the inclined adjustment grooves 9a of the rear swing arm bushing 7 by a pair of bolts 9' a, and is fastened by a nut 9, and a toe-in angle of the rear suspension system can be conveniently set by using the inclined adjustment grooves 9a of the rear longitudinal swing arm bushing 9.

As shown in fig. 1 or fig. 2, the rear suspension system of the present embodiment is connected to the wheel of the automobile through the hub spindle 37 of the rear longitudinal swing arm 8; preferably, the rear longitudinal swing arm 8 is a welded assembly of front and rear panels and a middle reinforcing plate stamped from a high-strength steel plate, which can control the toe-in of the vehicle, prevent the vehicle from braking and drifting, enable the vehicle to have a lower rollover center, and provide a suitable camber angle.

The rear stabilizer bar 17 is connected to the rear vertical swing arm 8 via a rear stabilizer link 15, connected to a lower rear portion of the rear subframe 26 with two rear stabilizer bar clips 18 and a rear stabilizer bar bushing 19, and fixed with screws 20.

As can be seen from the above description of the structure, the rear upper swing arm 5, the center bracket 26a of the rear subframe 26, the connecting bracket 26d of the rear subframe 26, the rear lower swing arm 33, and the rear longitudinal swing arm 8 constitute a spatial multi-link mechanism.

Because the utility model provides a space multi-link mechanism, back shock absorber 6 and coil spring 31 can be separated and independently set up.

With continued reference to fig. 1 and 2, rear shock absorber 6 is bolted to rear longitudinal swing arm 8 by bolts 29, the upper portion of which is bolted to the vehicle body (not shown), and rear shock absorber 6 is preferably of a dual tube type construction, which can be inflated and filled with oil, and which has a rebound damping action.

The coil spring 31 is connected to a vehicle body (not shown) through an upper vibration insulator 30, connected to a rear lower swing arm 33 through a lower vibration insulator 32, and formed with a groove (not shown) at a lower portion of the lower vibration insulator 32, the groove being connected and fixed to a circular protrusion 33a formed at the rear lower swing arm 33, the coil spring 31 is made of chrome steel, and the upper and

lower vibration insulators

30 and 32 may be made of a vibration damping material such as rubber, thereby reducing noise transmitted from the suspension to the vehicle body.

It should be noted that the structure, shape and function of the

bushings

27 and 2 and the

inner ball joints

11 and 35 described herein should be within the skill of one of ordinary skill in the art in light of the above teachings and will not be described in detail herein.

As described above, the rear suspension system of the present invention is formed with the spatial multi-link mechanism composed of the rear upper swing arm, the central support of the rear sub-frame, the connecting support of the rear sub-frame, the rear lower swing arm, and the rear longitudinal swing arm, and by arranging the positions and the connecting modes of the respective connecting rods, the rear shock absorber and the coil spring can be arranged in a form of independent parallel, which is convenient for the maintenance of the rear suspension system; moreover, due to the configuration of the multi-link mechanism, the characteristic parameters of the suspension such as the camber angle, the toe-in angle and the like of the rear suspension system can be conveniently adjusted and set, so that the running control stability of the whole vehicle is greatly improved, the response performance when a driving route is changed is also improved, the up-down stroke track of a tire is improved, and the riding comfort is increased; in addition, the design of the rear suspension system greatly optimizes the spatial arrangement position of the suspension, and is beneficial to increasing the compactness of the structure, so that the vehicle can have a lower and wider trunk floor, and a larger design space is provided for the trunk and the fuel tank.

While the invention has been described with reference to the present specific embodiments, those skilled in the art will recognize that the essence of the invention resides in the spatial arrangement of the multiple links in the suspension system, and that the above embodiments are merely illustrative of this essence, various equivalent changes or substitutions may be made by those skilled in the art without departing from the spirit of the present invention, for example, the coaxial arrangement of the rear shock absorber 6 and the coil spring 31 in the rear suspension system of the above embodiment, and the arrangement of the coil spring 31 on the rear upper swing arm 5 may be adopted, and such changes or substitutions are not exhaustive, and the changes and modifications of the above embodiment will fall within the protection scope of the claims of the present application without departing from the spirit of the present invention.

Claims

1. A rear suspension system of an automobile, comprising a coil spring and a shock absorber connected to a body of the automobile, characterized by further comprising: the rear auxiliary frame is connected with the body of the automobile and is provided with a central support and two connecting supports symmetrically extending out of two ends of the central support; two rear upper swing arms, two rear longitudinal swing arms, and two rear lower swing arms; wherein,

the two rear upper swing arms, the rear longitudinal swing arm and the rear lower swing arm are respectively and symmetrically arranged on two sides of the rear auxiliary frame;

the utility model discloses a rear auxiliary frame, including back sub vehicle frame, back lower swing arm, back upper swing arm, back lower swing arm, back.

2. The rear suspension system of an automobile according to claim 1, characterized in that: the rear upper swing arm is connected with the central support of the rear sub-frame through an eccentric bolt so as to adjust the camber angle of the rear suspension system.

3. The rear suspension system of an automobile according to claim 1, characterized in that: the rear upper swing arm also comprises a reinforcing rib, an inner connecting ball joint and a bushing.

4. The rear suspension system of a vehicle according to claim 3, wherein: the reinforcing rib is welded on the rear upper swing arm, one end of the reinforcing rib is assembled on the rear auxiliary frame through an inner connecting ball joint, and the other end of the reinforcing rib is connected on the rear longitudinal swing arm through a bushing.

5. The rear suspension system of an automobile according to claim 1, characterized in that: the back is indulged the swing arm and is had a back and indulge the swing arm bush, the both ends of back and indulge the swing arm bush are provided with the slant adjustment tank, just the back is indulged the swing arm and is passed through the back is indulged the swing arm bush the slant adjustment tank with the linking bridge of back sub vehicle frame is connected.

6. The rear suspension system of an automobile according to claim 1, characterized in that: and the rear longitudinal swing arm is a front panel, a rear panel and a middle reinforcing plate welding assembly which are formed by stamping high-strength steel plates.

7. The rear suspension system of an automobile according to claim 1, characterized in that: the shock absorber is installed on the rear longitudinal swing arm, one end of the shock absorber is connected with the vehicle body, and the spiral spring is installed between the vehicle body and the rear lower swing arm.

8. The rear suspension system of an automobile according to claim 7, characterized in that: the rear lower swing arm is provided with a circular protrusion, the spiral spring is provided with an upper vibration isolation pad and a lower vibration isolation pad, the lower part of the lower vibration isolation pad is provided with a groove, and the groove of the lower vibration isolation pad is connected with the circular protrusion of the rear lower swing arm.

9. The rear suspension system of an automobile according to claim 1, characterized in that: four mounting points are formed on the rear auxiliary frame, the rear auxiliary frame is connected with the body of the automobile through the mounting points, two mounting points are formed at the free end of the connecting support, and the other two mounting points are formed in the middle part of the arm part of the connecting support.