Automobile rear suspension system and automobile

Abstract

The present invention belongs to the field of automotive technology, and particularly relates to a rear suspension system and a vehicle. The rear suspension system includes a rear axle joint assembly, a rear lower swing arm assembly, a rear shock absorber assembly, a rear upper swing arm assembly, a rear toe arm assembly, and a rear longitudinal arm assembly; the rear lower swing arm assembly, the rear upper swing arm assembly, the rear toe arm assembly, and the rear longitudinal arm assembly are all connected to the rear axle joint assembly; the rear upper swing arm assembly is provided with a through hole, through which the rear shock absorber assembly is connected to the rear axle joint assembly; the rear lower swing arm assembly, the rear upper swing arm assembly, the rear toe arm assembly, the rear longitudinal arm assembly, and the rear shock absorber assembly are all connected to the vehicle body at one end away from the rear axle joint assembly. The rear suspension system of the present invention reduces the installation height of the rear shock absorber assembly, improves the riding space in the vehicle passenger compartment, and enhances the comfort of the entire vehicle.

Description

Technical Field

[0001] The invention belongs to the technical field of automobiles, and in particular relates to an automobile rear suspension system and an automobile. Background Art

[0002] The rear suspension system of a car is an important part of the car chassis. It not only affects the stability and ride comfort of the car chassis, but also affects the structure of the car, and thus affects the space size of the car passenger compartment.

[0003] In the prior art, due to the limited internal and external mounting space of the suspension, it is difficult to lower the height of the rear shock absorber assembly mounting point. This results in a narrow passenger compartment. Furthermore, the rear shock absorber assembly is positioned at a relatively inclined angle, reducing the rear suspension system's ability to attenuate road vibrations and, in turn, impacting overall vehicle comfort. Furthermore, the rear upper swing arm assembly in the prior art rear suspension system is typically positioned directly above the rear wheel hub, which not only impacts the layout of other components in four-wheel-drive vehicles but also hinders the improvement of rear suspension lateral force toe-in and rear axle response. Summary of the Invention

[0004] The present invention solves the technical problems in the prior art of a vehicle rear suspension system, such as a narrow passenger compartment and low comfort of the entire vehicle, and provides a vehicle rear suspension system and a vehicle.

[0005] In view of the above problems, an embodiment of the present invention provides a rear suspension system for an automobile, comprising a rear axle joint assembly, a rear lower swing arm assembly, a rear shock absorber assembly, a rear upper swing arm assembly, a rear front toe arm assembly and a rear longitudinal arm assembly; the rear lower swing arm assembly, the rear upper swing arm assembly, the rear front toe arm assembly and the rear longitudinal arm assembly are all connected to the rear axle joint assembly; a through hole is provided on the rear upper swing arm assembly, and the rear shock absorber assembly is connected to the rear axle joint assembly through the through hole, and the rear lower swing arm assembly, the rear upper swing arm assembly, the rear front toe arm assembly, the rear longitudinal arm assembly and the rear shock absorber assembly are all connected to the automobile body at one end away from the rear axle joint assembly.

[0006] Optionally, the rear upper swing arm assembly and the rear front toe arm assembly are arranged in the same vertical plane.

[0007] Optionally, the central axis of the rear shock absorber assembly is perpendicular to the horizontal plane.

[0008] Optionally, in the vertical direction, the first mounting point of the rear shock absorber assembly on the rear axle joint assembly is located between the second mounting point and the third mounting point; the second mounting point is the mounting point of the rear upper swing arm assembly on the rear axle joint assembly; and the third mounting point is the mounting point of the rear toe arm assembly on the rear axle joint assembly.

[0009] Optionally, the rear upper swing arm assembly, the rear toe arm assembly and the rear shock absorber assembly are all connected to the rear axle joint assembly through bushings; the rear lower swing arm assembly is connected to the rear axle joint assembly through a ball pin; and the rear longitudinal arm assembly is connected to the rear axle joint assembly through bolts.

[0010] Optionally, the automobile rear suspension system further includes a rear stabilizer bar assembly; one end of the rear stabilizer bar assembly is connected to the rear lower arm assembly, and the other end of the rear stabilizer bar assembly is connected to the automobile body.

[0011] Optionally, the rear stabilizer bar assembly includes a rotating ball pin, a stabilizer bar pull rod and a stabilizer bar connected to the stabilizer bar pull rod; a connecting piece is provided on the rear lower arm assembly, the stabilizer bar pull rod is rotatably connected to the connecting piece through the rotating ball pin, and the stabilizer bar is connected to the vehicle body at one end away from the stabilizer bar pull rod.

[0012] Optionally, the automobile rear suspension system further includes a rear spring assembly, and the rear lower arm assembly is provided with a mounting groove; one end of the rear spring assembly is installed in the mounting groove, and the other end of the rear spring assembly is connected to the automobile body.

[0013] Optionally, in the lateral direction, the mounting groove is located between a first connection point and a second connection point; the first connection point is the connection point between the rear axle joint assembly and the rear lower swing arm assembly; the second connection point is the connection point between the rear stabilizer bar assembly and the rear lower swing arm assembly.

[0014] In the present invention, a through hole is provided on the rear upper swing arm assembly, and the rear shock absorber assembly is connected to the rear axle joint assembly through the through hole, thereby greatly reducing the installation height of the rear shock absorber assembly, improving the riding space of the automobile passenger compartment, and further improving the comfort of the entire vehicle.

[0015] The present invention also provides an automobile, comprising the above automobile rear suspension system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and examples.

[0017] Figure 1 A schematic structural diagram of a vehicle rear suspension system provided by one embodiment of the present invention;

[0018] Figure 2 A schematic structural diagram of a vehicle rear suspension system provided by another embodiment of the present invention;

[0019] Figure 3 A top view of a vehicle rear suspension system provided by one embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the lateral force exerted on the rear wheel when the rear upper swing arm assembly does not move forward provided by one embodiment of the present invention;

[0021] Figure 5 A schematic diagram of the lateral force exerted on the rear wheel when the rear upper swing arm assembly moves forward according to an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of rear wheel toe-in provided by an embodiment of the present invention.

[0023] The reference numerals in the specification are as follows:

[0024] 1. Rear axle joint assembly; 2. Rear lower control arm assembly; 21. Mounting slot; 22. Connector; 3. Rear shock absorber assembly; 4. Rear upper control arm assembly; 41. Through hole; 5. Rear toe arm assembly; 6. Rear trailing arm assembly; 7. Rear stabilizer bar assembly; 71. Rotating ball pin; 72. Stabilizer bar tie rod; 73. Stabilizer bar; 8. Rear spring assembly; 9. Rear wheel; A. First mounting point; B. Second mounting point; C. Third mounting point; D. First connection point; E. Second connection point. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] It should be understood that the terms "upper", "lower", "left", "right", "front", "back", "middle", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0027] In the present invention, in order to better illustrate the structure and connection relationship of the rear suspension system of the automobile, the "front" referred to in the present invention is the direction actually pointing to the front of the automobile (i.e. Figure 2 The "rear" in the present invention actually refers to the direction of the rear end of the vehicle (i.e. Figure 2 The "upper" in the present invention refers to the direction of the roof (i.e., the left side of the rear suspension system of the vehicle shown in FIG); Figure 2 The "downward" in the present invention refers to the direction of the bottom of the vehicle (i.e. Figure 2The "longitudinal direction" referred to in the present invention refers to the front-to-back direction of the automobile (that is, the length direction of the automobile); the "lateral direction" referred to in the present invention refers to the left-right direction of the automobile (that is, the width direction of the automobile); and the "vertical direction" referred to in the present invention refers to the up-down direction of the automobile (that is, the height direction of the automobile).

[0028] like Figures 1 to 3 As shown, an automobile rear suspension system provided by an embodiment of the present invention includes a rear axle joint assembly 1, a rear lower swing arm assembly 2, a rear shock absorber assembly 3, a rear upper swing arm assembly 4, a rear front toe arm assembly 5 and a rear longitudinal arm assembly 6; the rear lower swing arm assembly 2, the rear upper swing arm assembly 4, the rear front toe arm assembly 5 and the rear longitudinal arm assembly 6 are all connected to the rear axle joint assembly 1; the rear upper swing arm assembly 4 is provided with a through hole 41, and the rear shock absorber assembly 3 is connected to the rear axle joint assembly 1 through the through hole 41, and the rear lower swing arm assembly 2, the rear upper swing arm assembly 4, the rear front toe arm assembly 5, the rear longitudinal arm assembly 6 and the rear shock absorber assembly 3 are all connected to the automobile body at one end away from the rear axle joint assembly 1 (not shown in the figure). Specifically, one end of the rear lower swing arm assembly 2 , the rear upper swing arm assembly 4 and the rear toe arm assembly 5 away from the rear axle joint assembly 1 is connected to the subframe of the automobile body.

[0029] In this embodiment, the rear axle joint assembly 1, a key component connecting the suspension linkage and the wheel assembly, is cast. The rear upper swing arm assembly 4 is made of aluminum alloy. The rear lower swing arm assembly 2 is a sheet metal stamping and welded component that provides support for the rear spring assembly 8. The rear trailing arm assembly 6 is a sheet metal stamping component that withstands longitudinal forces. The rear toe arm assembly 5 utilizes a two-force rod structure with a simple shape and structure. This automotive rear suspension system can achieve load-bearing, guiding, and cushioning functions.

[0030] In the present invention, a through hole 41 is provided on the rear upper swing arm assembly 4, and the rear shock absorber assembly 3 is connected to the rear axle joint assembly 1 through the through hole 41, thereby greatly reducing the installation height of the rear shock absorber assembly 3, improving the riding space of the automobile passenger compartment, and further improving the comfort of the entire vehicle.

[0031] In one embodiment, if Figures 1 to 3 As shown, the rear upper swing arm assembly 4 and the rear toe arm assembly 5 are arranged in the same vertical plane. It is understood that when the vehicle rear suspension system is installed on a vehicle, the rear upper swing arm assembly 4 and the rear toe arm assembly 5 are arranged in the same vertical plane in the longitudinal direction of the vehicle (i.e., the longitudinal direction of the vehicle).

[0032] Specifically, in order to ensure the vehicle's handling stability, the design of the rear suspension system generally requires that when subjected to lateral force, the toe-in of the rear wheels of the vehicle tends to increase due to the deformation of the bushings of each swing arm (including the rear upper swing arm assembly 4, the rear lower swing arm assembly 2, the rear toe-in arm assembly 5, etc.) (the rear upper swing arm assembly 4, the rear toe-in arm assembly 5, and the rear lower swing arm assembly 2 are all connected to the rear axle joint assembly 1 through bushings). Figure 4 and Figure 6 As shown, when the rear wheel 9 is subjected to a lateral force, if the rear upper swing arm assembly 4 is arranged in the middle position (i.e., the position between the rear toe arm assembly 5 and the rear lower swing arm assembly 2 in the longitudinal direction), the lateral force transmitted from the rear wheel 9 to the rear suspension system of the vehicle is mainly borne by the rear lower swing arm assembly 2 and the rear upper swing arm assembly 4, and the lateral force shared by the rear toe arm assembly 5 is very small, so the bushing deformation of the rear toe arm assembly 5 is very small, resulting in a very small change in the toe ß of the rear wheel 9 of the vehicle; as shown in FIG. Figure 5 and Figure 6 As shown, if the rear upper swing arm assembly 4 is positioned forward (i.e., it and the rear toe arm assembly 5 are arranged in the same vertical plane, i.e., the rear upper swing arm assembly 4 is moved forward longitudinally), the force distribution of each swing arm is changed, resulting in a greater deformation of the bushing of the rear toe arm assembly 5, thereby increasing the lateral toe-in ß. This increase in lateral toe-in ß is equivalent to increasing the equivalent sideslip angle of the rear wheel 9, thereby generating greater lateral force and reducing the rear axle's response time, thereby improving the rear axle's responsiveness and tracking performance.

[0033] For four-wheel drive and rear-wheel drive vehicles, the drive shaft is arranged at the wheel center position of the rear wheel 9. If the rear upper swing arm assembly 4 is at the wheel center position (that is, arranged above the wheel center of the rear wheel of the vehicle), the rear upper swing arm assembly 4 needs to avoid the envelope space of the drive shaft below and the longitudinal beam of the vehicle body above, which is very difficult in design. Therefore, by moving the rear upper swing arm assembly 4 forward so that it is not located above the wheel center of the rear wheel 9 of the vehicle, the constraint of the drive shaft can be avoided without affecting the layout of other components of the rear suspension system of the four-wheel drive vehicle, and the design margin is larger.

[0034] In summary, by arranging the rear upper swing arm assembly 4 and the rear toe arm assembly 5 in the same vertical plane (i.e., moving the rear upper swing arm assembly 4 forward), not only is the change in wheel toe-in when the rear suspension system of the vehicle is subjected to lateral force greatly improved, which is beneficial to improving the ability to establish lateral force on the rear axle, improving the response and followability of the rear axle, but it can also avoid the envelope space of the rear drive shaft of the vehicle, which is beneficial to the layout of the four-wheel drive vehicle.

[0035] In one embodiment, if Figures 1 to 3As shown, the central axis of the rear shock absorber assembly 3 is perpendicular to the horizontal plane. It can be understood that by arranging the axis of the rear shock absorber assembly 3 perpendicular to the horizontal plane, the vibration reduction efficiency of the rear shock absorber assembly 3 can be improved, thereby enabling the rear shock absorber assembly 3 to better attenuate road vibrations, thereby improving the comfort of the entire vehicle.

[0036] In one embodiment, if Figure 1 As shown, vertically, the first mounting point A of the rear shock absorber assembly 3 on the rear axle joint assembly 1 is located between the second mounting point B and the third mounting point C; the second mounting point B is the mounting point of the rear upper swing arm assembly 4 on the rear axle joint assembly 1; and the third mounting point C is the mounting point of the rear toe arm assembly 5 on the rear axle joint assembly 1. It can be understood that since the first mounting point A of the rear shock absorber assembly 3 on the rear axle joint assembly 1 is located between the second mounting point B of the rear upper swing arm assembly 4 on the rear axle joint assembly 1 and the third mounting point C of the rear toe arm assembly 5 on the rear axle joint assembly 1.

[0037] Preferably, in the vertical direction of the automobile, the first mounting point A, the second mounting point B and the third mounting point C are almost in the same plane. This design makes the structure of the automobile rear suspension system more compact; in the longitudinal direction of the automobile, the positions of the three mounting points, the first mounting point A, the second mounting point B and the third mounting point C, can be set according to actual needs, so that there is no need to reserve installation space for the rear shock absorber assembly 3 on the rear lower arm assembly 2, thereby reducing the space occupied by the automobile rear suspension system in the lateral direction. On the side close to the subframe of the automobile, the rear lower arm assembly 2 avoids the installation position of the third row of seats, and the saved space can be used to increase the passenger compartment space, thereby improving the comfort of the entire vehicle.

[0038] In one embodiment, the rear upper swing arm assembly 4, the rear toe arm assembly 5, and the rear shock absorber assembly 3 are all connected to the rear axle joint assembly 1 via bushings; the rear lower swing arm assembly 2 is connected to the rear axle joint assembly 1 via a ball pin; and the rear trailing arm assembly 6 is connected to the rear axle joint assembly 1 via bolts. It is understood that the ends of the rear upper swing arm assembly 4, the rear lower swing arm assembly 2, and the rear toe arm assembly 5 away from the rear axle joint assembly 1 are all connected to the subframe via bushings; the end of the rear shock absorber assembly 3 away from the rear axle joint assembly 1 is connected to the vehicle body via bolts; and the end of the rear trailing arm assembly 6 away from the rear axle joint assembly 1 is connected to the vehicle body via bushings. Through the aforementioned connection relationships, the rear suspension system of the vehicle in this embodiment can support the vehicle body and withstand vertical, lateral, and longitudinal forces from the road surface.

[0039] In one embodiment, if Figures 1 to 3As shown, the rear suspension system further includes a rear stabilizer bar assembly 7; one end of the rear stabilizer bar assembly 7 is connected to the rear lower arm assembly 2 (via a bushing), and the other end of the rear stabilizer bar assembly 7 is connected to the vehicle body (via a bushing). Preferably, the rear stabilizer bar assembly 7 includes a rotating ball pin 71, a stabilizer bar tie rod 72, and a stabilizer bar 73 connected to the stabilizer bar tie rod 72. The rear lower arm assembly 2 is provided with a connecting member 22, and the stabilizer bar tie rod 72 is rotatably connected to the connecting member 22 via the rotating ball pin 71. The stabilizer bar 73 is connected to the vehicle body at one end away from the stabilizer bar tie rod 72. Specifically, the stabilizer bar 73 is connected to the vehicle body's subframe at one end away from the stabilizer bar tie rod 72. The design of the rear stabilizer bar assembly 7 improves the stability of the rear suspension system.

[0040] In one embodiment, if Figures 1 to 3 As shown, the vehicle rear suspension system also includes a rear spring assembly 8. The rear lower arm assembly 2 is provided with a mounting slot 21. One end of the rear spring assembly 8 is mounted within the mounting slot 21, while the other end of the rear spring assembly 8 is connected to the vehicle body. It is understood that the rear spring assembly 8 and the rear shock absorber assembly 3 are separately provided in the vehicle rear suspension system, with the rear shock absorber assembly 3 being provided on the rear axle joint assembly 1 and the rear spring assembly 8 being provided on the rear lower arm assembly 2. As a result, the vehicle rear suspension system absorbs vibration from the vehicle wheels at two different locations (i.e., the rear axle joint assembly 1 and the rear lower arm assembly 2), reducing the strength requirements of the vehicle rear suspension system and facilitating the lightweight design of the vehicle.

[0041] In one embodiment, if Figure 3 As shown, the mounting slot 21 is located between a first connection point D and a second connection point E. The first connection point D is the connection point between the rear axle joint assembly 1 and the rear lower arm assembly 2, and the second connection point E is the connection point between the rear stabilizer bar assembly 7 and the rear lower arm assembly 2. It can be understood that, in the lateral direction of the vehicle, the first connection point D, the mounting slot 21, and the second connection point E are sequentially distributed on the rear lower arm assembly 2. Preferably, in the lateral direction of the vehicle, the first connection point D, the mounting slot 21, and the second connection point E are substantially coplanar. This design makes the rear suspension system more compact. By mounting the rear spring assembly 8 on the rear lower arm assembly 2, the rear spring assembly 8 supports the vehicle body, cushions impacts, and transmits forces acting on the vehicle body to the lower arm assembly 2.

[0042] The present invention also provides an automobile, comprising the automobile rear suspension system.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rear suspension system for an automobile, comprising a rear axle joint assembly, a rear lower swing arm assembly, a rear shock absorber assembly, a rear upper swing arm assembly, a rear front toe arm assembly, and a rear trailing arm assembly; the rear lower swing arm assembly, the rear upper swing arm assembly, the rear front toe arm assembly, and the rear trailing arm assembly are all connected to the rear axle joint assembly; characterized in that: The rear upper swing arm assembly is provided with a through hole, the rear shock absorber assembly is connected to the rear axle joint assembly through the through hole, and the rear lower swing arm assembly, the rear upper swing arm assembly, the rear toe arm assembly, the rear trailing arm assembly, and the rear shock absorber assembly are all connected to the vehicle body at one end away from the rear axle joint assembly; The rear upper swing arm assembly and the rear front toe arm assembly are arranged in the same vertical plane; the rear upper swing arm assembly is located in front of the axle of the rear wheel of the vehicle; In the vertical direction, the first mounting point of the rear shock absorber assembly on the rear axle joint assembly is located between the second mounting point and the third mounting point; the second mounting point is the mounting point of the rear upper swing arm assembly on the rear axle joint assembly; the third mounting point is the mounting point of the rear toe arm assembly on the rear axle joint assembly; in the vertical direction of the vehicle, the first mounting point, the second mounting point and the third mounting point are located almost in the same plane.

2. The automobile rear suspension system according to claim 1, characterized in that: The central axis of the rear shock absorber assembly is perpendicular to the horizontal plane.

3. The automobile rear suspension system according to claim 1, characterized in that: The rear upper swing arm assembly, the rear toe arm assembly and the rear shock absorber assembly are all connected to the rear axle joint assembly through bushings; the rear lower swing arm assembly is connected to the rear axle joint assembly through a ball pin; and the rear trailing arm assembly is connected to the rear axle joint assembly through bolts.

4. The automobile rear suspension system according to any one of claims 1 to 3, characterized in that: The automobile rear suspension system further comprises a rear stabilizer bar assembly; one end of the rear stabilizer bar assembly is connected to the rear lower swing arm assembly, and the other end of the rear stabilizer bar assembly is connected to the automobile body.

5. The automobile rear suspension system according to claim 4, characterized in that: The rear stabilizer bar assembly includes a rotating ball pin, a stabilizer bar pull rod and a stabilizer bar connected to the stabilizer bar pull rod; a connecting piece is provided on the rear lower swing arm assembly, the stabilizer bar pull rod is rotatably connected to the connecting piece through the rotating ball pin, and the stabilizer bar is connected to the car body at one end away from the stabilizer bar pull rod.

6. The automobile rear suspension system according to claim 4, characterized in that: The automobile rear suspension system also includes a rear spring assembly, and the rear lower arm assembly is provided with a mounting groove; one end of the rear spring assembly is installed in the mounting groove, and the other end of the rear spring assembly is connected to the automobile body.

7. The automobile rear suspension system according to claim 6, characterized in that: In the lateral direction, the mounting groove is located between a first connection point and a second connection point; the first connection point is the connection point between the rear axle joint assembly and the rear lower swing arm assembly; the second connection point is the connection point between the rear stabilizer bar assembly and the rear lower swing arm assembly.

8. An automobile, characterized in that: A vehicle rear suspension system comprising the vehicle rear suspension system according to any one of claims 1 to 7.

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