A rear suspension structure with a subframe torsion beam

Abstract

The present application relates to a kind of rear suspension structure with subframe torsion beam, it is related to the technical field of automobile design and manufacture.The rear suspension structure with subframe torsion beam of the present application, including torsion beam, frame type subframe, damping spring and shock absorber, the structure is introduced subframe structure on the basis of traditional torsion beam suspension structure, subframe four corners are pressed into rubber bushing, increase secondary damping while can pass through adjusting subframe front and rear direction span and front and rear rubber bushing rigidity optimization rear suspension K&C characteristics, improve vehicle handling stability and ride comfort;Torsion beam is installed on rear subframe, rear subframe four corners bushing inner sleeve pipe can be reserved with installation bolt certain adjustment gap, provide adjustment space for rear wheel toe angle excess, increase vehicle out-of-line qualification rate.

Description

Technical Field

[0001] This invention relates to the technical field of automobile design and manufacturing, and more specifically, to a rear suspension structure with a subframe and torsion beam. Background Technology

[0002] like Fig. 1-2 As shown, in existing torsion beam structures, the front bushing is a common rubber bushing. For example, a hole is cut in one direction. This cutting reduces the corresponding radial stiffness of the bushing, decreasing the impact of uneven ground on the vehicle body from the rear axle. However, cutting a hole in the bushing also reduces its axial stiffness, directly affecting the lateral stiffness of the torsion beam suspension. Fig. 3 As shown, when the left and right wheels of the vehicle are subjected to lateral forces in the same direction during a turn, the rear torsion beam will experience lateral displacement and deflection angle. The axle steering direction will cause the vehicle to tend towards oversteer. Because the torsion beam rear suspension only has primary vibration isolation at the front bushing level from the tire to the body, its NVH performance is inferior to that of a multi-link suspension, affecting comfort. Currently, the wheel toe angle of the torsion beam rear suspension is guaranteed by welding; if the wheel toe angle exceeds the tolerance due to welding deviations in the body mounting bracket, it cannot be adjusted. Furthermore, because the left and right front bushing axes of the torsion beam have an included angle, it is difficult to assemble it with the body on the final assembly line, affecting assembly efficiency. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems of the torsion beam structure in the prior art, the purpose of this invention is to provide a torsion beam rear suspension structure with subframe.

[0004] The present invention relates to a torsion beam rear suspension structure with a subframe, comprising a torsion beam, a frame-type subframe, and shock absorbers; solid bushings are provided at the front ends of both sides of the torsion beam, and spring mounting seats are provided at the rear ends of both sides of the torsion beam, with shock-absorbing springs mounted on the spring mounting seats; the main body of the frame-type subframe is formed by connecting two subframe crossbeams and two subframe side beams, with a front bushing at the front end of each of the two subframe side beams and a rear bushing at the rear end of each of the two subframe side beams, the front and rear bushings having different perforation directions; the front bushings... The subframe has a front inner sleeve and a rear inner sleeve. A spring mounting seat is located at the center of the lower surface of each of the two subframe side beams. A rubber pad is located inside the mounting seat, and the upper end of the damping spring contacts the rubber pad. Torsion beam mounting brackets are located on both sides below the front subframe crossbeam. The torsion beam is screwed onto the torsion beam mounting brackets. The frame-type subframe is fixed to the vehicle body by passing through the front and rear inner sleeves, and there are gaps between the bolts and the front inner sleeve, and between the bolts and the rear inner sleeve.

[0005] The vibration dampers are located at the rear ends of both sides of the torsion beam.

[0006] The two front bushings are drilled in a horizontal direction, and the two rear bushings are drilled in a vertical direction.

[0007] The front bushing is press-fitted to the front end of the subframe side beam, and the rear bushing is press-fitted to the rear end of the subframe side beam.

[0008] The main body of the frame-type subframe is welded together from two subframe crossbeams and two subframe side beams.

[0009] Among them, spring mounting seats are welded to the middle of the lower surface of the two subframe side beams.

[0010] Among them, torsion beam mounting brackets are welded on both sides below the front subframe crossbeam.

[0011] Compared with the prior art, the rear suspension structure with subframe torsion beam of the present invention has the following advantages:

[0012] 1. Based on the traditional torsion beam suspension structure, a subframe structure is introduced. Rubber bushings are press-fitted at the four corners of the subframe to increase secondary vibration reduction. At the same time, the K&C characteristics of the rear suspension can be optimized by adjusting the front and rear span of the subframe and the stiffness of the front and rear rubber bushings, thereby improving the overall vehicle handling stability and ride comfort.

[0013] 2. By introducing a subframe structure with bushings, the longitudinal stiffness of the rear wheel center no longer relies entirely on the front bushing of the torsion beam. Therefore, the front bushing of the torsion beam can adopt a solid structure, which improves fatigue resistance compared to the perforated bushing structure.

[0014] 3. Since the torsion beam is installed on the rear subframe, the inner sleeves of the bushings at the four corners of the rear subframe can reserve a certain adjustment gap with the mounting bolts, providing adjustment space for the rear wheel toe angle to exceed the tolerance, and increasing the overall vehicle qualification rate;

[0015] 4. The torsion beam can be pre-assembled with the rear subframe offline, and the rear suspension and body can be modularly assembled, improving the overall assembly efficiency. Attached Figure Description

[0016] Fig. 1 This is a schematic diagram of a torsion beam structure in the prior art.

[0017] Fig. 2 for Fig. 1 A schematic diagram of the bushing structure in a torsion beam structure.

[0018] Fig. 3 This is a schematic diagram of the rear axle rotation under lateral force in a torsion beam structure in the prior art.

[0019] Fig. 4 This is a schematic diagram of the rear suspension structure with a subframe and torsion beam in Example 1. Detailed Implementation

[0020] The following will further elaborate on the rear suspension structure with subframe torsion beam of the present invention with reference to specific embodiments, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the technical solution of the present invention.

[0021] Example 1

[0022] like Fig. 4 As shown, the rear suspension structure with torsion beam and subframe in this embodiment includes a torsion beam 100, a frame-type subframe 200, a spring 300, and a shock absorber 400.

[0023] Solid bushings 110 are provided at both front ends of the torsion beam 100, and spring fixing seats are provided at both rear ends of the torsion beam 100. The damping springs 300 are mounted on the spring fixing seats, and the dampers 400 are located at both rear ends of the torsion beam 100. The main body of the frame-type subframe 200 is welded from two subframe crossbeams and two subframe side beams. A front bushing 230 is press-fitted to the front end of each of the two subframe side beams, and a rear bushing 240 is press-fitted to the rear end of each of the two subframe side beams. The two front bushings 230 have holes cut in the transverse direction (Y-axis of the entire vehicle) to reduce the lateral stiffness of the bushings, and a front inner sleeve 231 is provided inside the front bushing 230. The two rear bushings 240 have holes cut in the longitudinal direction (X-axis of the entire vehicle) to reduce their longitudinal stiffness, and a rear inner sleeve 241 is provided inside the rear bushing 240. The rear suspension exhibits reasonable K&C characteristics through stiffness settings in different directions. Spring mounting brackets 220 are welded to the middle of the lower surface of the two subframe side beams. Rubber pads are installed inside the mounting brackets 220, and the upper end of the damping spring 300 contacts the rubber pads. Torsion beam mounting brackets 210 are welded to both sides below the front subframe crossbeam.

[0024] The torsion beam 100 is screwed onto the torsion beam mounting bracket 210, while the frame-type subframe 200 is fixed to the vehicle body by passing through the front inner sleeve 231 and the rear inner sleeve 241. There are gaps between the bolts and the front inner sleeve 231, and between the bolts and the rear inner sleeve 241. This embodiment's structure, by reserving a certain assembly adjustment gap between the inner sleeves and the bolts, allows for a degree of overall adjustment of the rear suspension module to correct the rear wheel toe angle if it exceeds tolerance, thus improving the overall vehicle yield rate. In this embodiment, the torsion beam and subframe can be assembled separately offline, and modular assembly of the rear suspension can be achieved on the final assembly line, significantly improving the overall vehicle yield rate, reducing rework probability, and greatly increasing assembly efficiency.

[0025] In the embodiment, rubber bushings are press-fitted at four corners of the subframe, which not only increases the secondary damping performance of the rear suspension, but also optimizes the K&C characteristics of the rear suspension by adjusting the front-to-rear direction span of the subframe and the front-to-rear rubber bushing stiffness, thereby improving the vehicle handling stability and ride comfort. Since the subframe bushings are introduced, the rear wheel center longitudinal stiffness no longer completely relies on the torsion beam front bushing, so the torsion beam front bushing adopts a solid structure, which significantly improves the fatigue resistance. The torsion beam is installed on the rear subframe, and the rear subframe bushing inner sleeve can have a certain adjustment gap reserved with the mounting bolt, which provides adjustment space for the rear wheel toe angle out-of-tolerance, thereby increasing the vehicle out-of-line qualification rate. In addition, the torsion beam can be pre-assembled with the rear subframe offline, and the rear suspension and the vehicle body can be modularly assembled, thereby improving the assembly efficiency.

[0026] For those skilled in the art, the specific embodiments are only exemplary descriptions of the present application, and it is obvious that the specific implementation of the present application is not limited by the above method. Any non-essential improvement using the method concept and technical solution of the present application is within the protection scope of the present application.

Claims

1. A rear suspension structure with a subframe torsion beam, characterized by: The application relates to a torsion beam, a frame type subframe and a shock absorber, wherein the two side ends of the torsion beam are provided with solid bushings, the two side rear ends of the torsion beam are provided with spring fixing seats, the spring fixing seats are provided with damping springs, the main body of the frame type subframe is connected by two subframe cross beams and two subframe side beams, the front ends of the two subframe side beams are respectively provided with front bushings, the rear ends of the two subframe side beams are respectively provided with rear bushings, the front bushings and the rear bushings are different in hole digging direction, the front inner sleeves are arranged in the front bushings, the rear inner sleeves are arranged in the rear bushings, spring upper mounting seats are arranged in the middle of the lower surfaces of the two subframe side beams, rubber pads are arranged in the mounting seats, the upper ends of the damping springs are in contact with the rubber pads, torsion beam mounting supports are arranged below the two sides of the front subframe cross beams, the torsion beam is screwed on the torsion beam mounting supports, the frame type subframe is fixed with the vehicle body by penetrating the front inner sleeves and the rear inner sleeves, and gaps exist between the bolts and the front inner sleeves and between the bolts and the rear inner sleeves, the hole digging directions of the two front bushings are transverse, the hole digging directions of the two rear bushings are longitudinal, the front bushings are press-fitted at the front ends of the subframe side beams, the rear bushings are press-fitted at the rear ends of the subframe side beams, and once the rear wheel toe angle is out of tolerance, the rear suspension module can be adjusted to correct the rear wheel toe angle to a certain extent by reserving a certain assembly adjustment gap between the inner sleeves and the bolts.

2. The rear suspension structure with a subframe torsion beam according to claim 1, characterized in that: The shock absorber is arranged at the two side rear ends of the torsion beam.

3. The rear suspension structure with a subframe torsion beam according to claim 1, characterized in that: The main body of the frame type subframe is welded by two subframe cross beams and two subframe side beams.

4. The rear suspension structure with a subframe torsion beam according to claim 1, characterized in that: Spring upper mounting seats are welded on the middle of the lower surfaces of the two subframe side beams.

5. The rear suspension structure with a subframe torsion beam according to claim 1, characterized in that: Torsion beam mounting supports are welded below the two sides of the front subframe cross beams.

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