A four-wheel vehicle double wishbone front independent suspension structure

Abstract

The utility model discloses a four-wheel vehicle double fork arm front independent suspension structure, including auxiliary frame, upper fork arm, lower fork arm, steering knuckle, spiral composite spring and steering drag link. Upper fork arm and lower fork arm adopt triangle structure and are hinged with auxiliary frame respectively, and are connected with the upper and lower parts of steering knuckle through spherical hinge on the outside, and constitute double fork arm guiding mechanism, spiral composite spring is arranged between lower fork arm and car body, and shock absorber and spiral spring are coaxially arranged, and steering drag link is connected with steering knuckle. The structure installation relation is clear, and the arrangement is compact, and it is favorable to improve front suspension guiding stability and ride smoothness.

Description

Technical Field

[0001] This utility model relates to the field of vehicle chassis suspension technology, and more specifically to a double wishbone front independent suspension structure for a four-wheeled vehicle. Background Technology

[0002] In existing low-speed four-wheeled vehicles and some light vehicles, the solid axle front suspension is still widely used due to its simple structure, low cost, strong load-bearing capacity, and convenient maintenance. This type of structure connects the left and right wheels through a rigid axle, and can adapt to more complex road conditions and load requirements.

[0003] However, the solid axle front suspension is a non-independent suspension. The movement of one wheel directly affects the other wheel, making the vehicle more prone to pitching and yaw on uneven surfaces, thus limiting ride smoothness and comfort. At the same time, the solid axle structure has high system rigidity. Under conditions of encountering obstacles on one side or asymmetrical loads, the axle is prone to adverse attitude changes, affecting tire contact with the ground and steering stability, making it difficult to meet the application scenarios that require higher standards of comfort and handling consistency.

[0004] To address these issues, independent front suspension has gradually become an option. Among them, the double wishbone independent front suspension uses upper and lower wishbones to constrain the wheel posture in layers. It features clear directional relationships, good lateral support capabilities, and strong adjustability of geometric parameters. It can better maintain wheel positioning stability under the combined conditions of vehicle steering and bouncing, and provides a more flexible basis for the arrangement of springs and damping systems.

[0005] Therefore, it is necessary to provide a double wishbone front independent suspension structure that is compact, has a clear installation relationship, and is easy to match and assemble, so as to improve the vehicle's ride comfort, steering stability and overall user experience while meeting cost and layout requirements. Utility Model Content

[0006] This utility model aims to provide a double wishbone front independent suspension structure. Through the double wishbone guide mechanism of the upper and lower wishbones, and in conjunction with the installation relationship of the steering knuckle, helical composite spring and steering tie rod, a front independent suspension module is formed to improve the guiding stiffness of the front suspension and the stability of wheel positioning.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A double wishbone independent front suspension structure for a four-wheeled vehicle includes a subframe, an upper wishbone, a lower wishbone, a steering knuckle, a coil composite spring, and a steering tie rod.

[0009] The subframe is used to connect to the vehicle body;

[0010] The upper and lower forks are respectively located in the area above and below the subframe. Both the upper and lower forks are triangular structures with two inner mounting points and one outer connection point.

[0011] The two inner mounting points of the upper wishbone are hinged to the subframe via bushings, and the outer connection point of the upper wishbone is connected to the upper part of the steering knuckle via a ball joint.

[0012] The two inner mounting points of the lower wishbone are hinged to the subframe via bushings, and the outer connection point of the lower wishbone is connected to the lower part of the steering knuckle via a ball joint.

[0013] The helical composite spring is installed between the lower fork and the body. The lower end of the helical composite spring is connected to the spring tray of the lower fork, and the upper end is connected to the body.

[0014] The steering tie rod is connected to the steering knuckle.

[0015] Preferably, both the upper and lower forks have an A-shaped structure.

[0016] Preferably, the helical composite spring includes a helical spring and a shock absorber, the shock absorber being arranged along the axis of the helical spring and passing through the interior of the helical spring.

[0017] Preferably, a lower spring tray is provided on the lower fork arm, and the lower end of the helical composite spring is connected to the lower spring tray. The lower spring tray and the lower fork arm are integrally provided or fixedly connected.

[0018] Preferably, the hinge height of the upper fork on the subframe is higher than the hinge height of the lower fork on the subframe.

[0019] Preferably, the outer connection points of the upper wishbone and the outer connection points of the lower wishbone are arranged at intervals in the vertical direction, and the steering knuckle is provided with an upper connection part and a lower connection part corresponding to the ball joint connection parts of the upper wishbone and the lower wishbone, respectively.

[0020] Preferably, the virtual kingpin axis formed by the upper and lower forks has a preset inclination angle, and the lower end point of the virtual kingpin axis is located inside the wheel ground contact center.

[0021] Preferably, the inclination angle is 7.8°.

[0022] Preferably, the distance between the lower end of the virtual kingpin axis and the inner side of the wheel grounding center is 71.2 mm.

[0023] Preferably, one end of the steering tie rod is connected to the steering arm of the steering knuckle, and the other end is connected to the output end of the steering mechanism.

[0024] Compared with existing technologies, this invention has the following advantages: This invention uses a subframe as the mounting base for the front suspension. The upper and lower wishbones adopt a triangular structure with two inner mounting points and one outer connection point, and are respectively connected to the upper and lower parts of the steering knuckle to form a double wishbone guiding structure. This makes the front wheel guiding relationship clearer and improves the lateral support and wheel positioning stability of the suspension. A helical composite spring is positioned between the lower wishbone and the vehicle body, and its lower end can be integrally or fixedly connected to the spring tray of the lower wishbone. Simultaneously, the shock absorber can be arranged coaxially along the helical spring axis, making the spring and shock absorption system compact, rationally arranged, and easy to assemble. Through spatial geometric matching of the upper and lower wishbones, the virtual kingpin axis can form a preset inclination angle, and the lower end of the virtual kingpin axis can be located inside the wheel ground contact center, forming a negative offset steering geometry, which is beneficial for improving stability during steering. The steering tie rod cooperates with the steering knuckle to make the steering transmission path clear, and works together with the double wishbone guiding mechanism to improve the handling consistency and ride comfort during vehicle operation. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of the double wishbone front independent suspension structure of this utility model.

[0027] Figure 2 This is a front structural diagram of the double wishbone front independent suspension structure of this utility model.

[0028] Figure 3 This is a schematic diagram of the geometric relationship of the double wishbone front independent suspension structure of this utility model.

[0029] The components represented by the markings in the attached diagram are as follows:

[0030] 1-Subframe; 2-Upper wishbone; 3-Lower wishbone; 4-Steering knuckle; 5-Coil compound spring; 6-Steering tie rod Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example

[0033] like Figures 1-3 As shown, a double wishbone front independent suspension structure includes a subframe 1, an upper wishbone 2, a lower wishbone 3, a steering knuckle 4, a coil spring 5, and a steering tie rod 6. The subframe 1 is used for rigid connection to the vehicle body, serving as the mounting base for the suspension. The steering knuckle 4 is used to mount the wheel and wheel hub bearing unit. Both the upper wishbone 2 and the lower wishbone 3 are triangular structures with two inner mounting points and one outer ball joint point. The two inner points of the upper wishbone 2 and the lower wishbone 3 are hinged to the subframe 1 through bushings, and their outer ball joint points are connected to the upper and lower parts of the steering knuckle 4, respectively, together forming a double wishbone guiding mechanism.

[0034] In this embodiment, both the upper wishbone 2 and the lower wishbone 3 can adopt an A-shaped structure, and both are connected to the steering knuckle 4 via ball joints. By matching the lengths, installation heights, and spatial angles of the upper wishbone 2 and the lower wishbone 3, the virtual kingpin axis formed by the double wishbone mechanism has a preset inclination angle, and the lower end point of the virtual kingpin is located inside the wheel contact center. For a specific example, the inclination angle is 7.8°, and the distance between the lower end point of the virtual kingpin and the inner side of the wheel contact center is 71.2 mm.

[0035] Furthermore, the length and angle relationship between the upper fork 2 and the lower fork 3 can be set according to the vehicle's enveloping space, so that the wheel has a relatively stable toe-in and trail variation pattern during the bouncing process.

[0036] The helical composite spring 5 is integrated into a single unit, with its lower end directly integrated with the spring tray of the lower fork arm 3 and its upper end connected to the corresponding mounting part of the vehicle body. The helical composite spring 5 uses a helical spring as the main elastic element, and the shock absorber passes through the center of the helical spring to form a coaxial structure, thereby achieving a compact installation.

[0037] The steering tie rod 6 is connected to the steering knuckle 4. One end of the steering tie rod 6 is connected to the steering arm of the steering knuckle 4, and the other end is connected to the output end of the steering mechanism, thereby realizing the transmission of steering output. The spatial positioning of the steering tie rod 6 and the double wishbone guide mechanism ensures that the steering knuckle 4 maintains a preset motion relationship under the combined working conditions of steering and bouncing.

[0038] During assembly, the subframe 1 is first fixed to the preset position on the vehicle body. Then, the inner mounting points of the upper wishbone 2 and lower wishbone 3 are connected to the corresponding hinge parts of the subframe 1. Next, the outer ball joints of the upper wishbone 2 and lower wishbone 3 are connected to the upper and lower parts of the steering knuckle 4, respectively. Then, the lower end of the coil composite spring 5 is aligned and installed with the spring tray of the lower wishbone 3, and the upper end is connected to the vehicle body spring seat, thus completing the connection between the shock absorber, the lower wishbone 3, and the vehicle body. Finally, the steering tie rod 6 is connected to the steering knuckle 4 to form a complete front double wishbone independent suspension assembly. While maintaining the basic installation relationship of the subframe 1, upper wishbone 2, lower wishbone 3, steering knuckle 4, coil composite spring 5, and steering tie rod 6, the dimensions of the wishbone, the distance between the hinge points, and the spring damping parameters can be adapted and adjusted according to the axle load and layout space of different vehicle models.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double wishbone independent front suspension structure for a four-wheeled vehicle, characterized in that, It includes a subframe (1), upper wishbone (2), lower wishbone (3), steering knuckle (4), helical composite spring (5), and steering tie rod (6); The subframe (1) is used to connect to the vehicle body; The upper fork (2) and lower fork (3) are respectively located above and below the subframe (1). Both the upper fork (2) and lower fork (3) are triangular structures with two inner mounting points and one outer connection point. The two inner mounting points of the upper wishbone (2) are hinged to the subframe (1) through bushings, and the outer connecting point of the upper wishbone (2) is connected to the upper part of the steering knuckle (4) through a ball joint. The two inner mounting points of the lower fork (3) are hinged to the subframe (1) through bushings, and the outer connecting point of the lower fork (3) is connected to the lower part of the steering knuckle (4) through a ball joint. A helical composite spring (5) is set between the lower fork arm (3) and the vehicle body. The lower end of the helical composite spring (5) is connected to the spring tray of the lower fork arm (3), and the upper end is connected to the vehicle body. The steering tie rod (6) is connected to the steering knuckle (4).

2. The double wishbone front independent suspension structure for a four-wheeled vehicle according to claim 1, characterized in that, Both the upper fork arm (2) and the lower fork arm (3) are A-shaped structures.

3. The double wishbone front independent suspension structure for a four-wheeled vehicle according to claim 1, characterized in that, The helical composite spring (5) includes a helical spring and a shock absorber, which is arranged along the axis of the helical spring and passes through the interior of the helical spring.

4. The double wishbone front independent suspension structure for a four-wheeled vehicle according to claim 1, characterized in that, A lower spring tray is provided on the lower fork arm (3), and the lower end of the helical composite spring (5) is connected to the lower spring tray. The lower spring tray and the lower fork arm (3) are integrally set or fixedly connected.

5. A double wishbone independent front suspension structure for a four-wheeled vehicle according to claim 1, characterized in that, The hinge height of the upper fork (2) on the subframe (1) is higher than the hinge height of the lower fork (3) on the subframe (1).

6. The double wishbone front independent suspension structure for a four-wheeled vehicle according to claim 1, characterized in that, The outer connection point of the upper fork arm (2) and the outer connection point of the lower fork arm (3) are arranged at intervals in the vertical direction. The steering knuckle (4) is provided with an upper connection part and a lower connection part corresponding to the ball joint connection parts of the upper fork arm (2) and the lower fork arm (3).

7. A double wishbone front independent suspension structure for a four-wheeled vehicle according to claim 1, characterized in that, The virtual kingpin axis formed by the upper fork arm (2) and the lower fork arm (3) has a preset inclination angle, and the lower end point of the virtual kingpin axis is located inside the wheel ground center.

8. A double wishbone front independent suspension structure for a four-wheeled vehicle according to claim 7, characterized in that, The inclination angle is 7.8°.

9. A double wishbone independent front suspension structure for a four-wheeled vehicle according to claim 7, characterized in that, The distance between the lower end of the virtual kingpin axis and the inner side of the wheel grounding center is 71.2 mm.

10. A double wishbone front independent suspension structure for a four-wheeled vehicle according to claim 1, characterized in that, One end of the steering tie rod (6) is connected to the steering arm of the steering knuckle (4), and the other end is connected to the output end of the steering mechanism.

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