Torsion beam and vehicle
By changing the angle and structural design of the crossbeam reinforcement plate, force transmission is optimized, fatigue failure of the torsion beam is solved, service life is extended, lightweight is achieved, and stress concentration and weight are reduced.
Patent Information
- Application Number
- CN202510945488.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-09
- Publication Date
- 2025-09-19
AI Technical Summary
After adding a crossbeam reinforcement plate, the existing torsion beam is prone to fatigue failure and cracking, which shortens the fatigue life.
By changing the included angle between the second reinforcement plate of the crossbeam reinforcement plate and the vertical direction to 8°, the force transmission of the longitudinal arm-crossbeam reinforcement plate-crossbeam is optimized, the stress concentration at the connection position is reduced, a closed crossbeam structure is adopted, and the design is optimized through CAE simulation and torsional bench fatigue test.
The fatigue life of the torsion beam is extended, stress concentration is reduced, weld cracking is reduced, reliability is improved, and lightweight design is achieved, reducing weight and cost.
Smart Images
Figure CN120663704A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of vehicle technology, and more particularly, to a torsion beam and a vehicle. Background Art
[0002] The torsion beam serves as the rear suspension of the automobile chassis, connecting the body and tires, playing a guiding role, and can withstand the forces and moments of elastic elements, shock absorbers, and buffer blocks. Its crossbeam has the function of a lateral stabilizer bar.
[0003] The working principle of a torsion beam suspension is to mount the wheels of a dependent suspension at either end of a torsion beam. When one wheel bounces up and down, the torsion beam vibrates around the axis of its two bushings, driving the other wheel to bounce accordingly, reducing the tilt or shake of the entire vehicle body. Because it has a certain degree of torsional rigidity, it can function similarly to a lateral stabilizer bar, increasing the vehicle's roll stiffness and improving its roll stability.
[0004] Torsion beams are composed of several components based on their structural and functional characteristics. Current torsion beams are primarily categorized into two types: open-beam and closed-beam, based on the cross-section shape of the beam. Of these two structures, closed-beam torsion beams offer lightweight performance and are widely used in the market. To improve the lateral strength of the torsion beam, a beam reinforcement plate is typically installed. However, the addition of this plate can cause fatigue failure and cracking at the ends of the lap weld between the beam reinforcement plate and the beam during torsion, shortening the fatigue life of the torsion beam.
[0005] Therefore, how to improve the fatigue life of the torsion beam has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention
[0006] In view of this, an object of the present application is to provide a torsion beam to improve the fatigue life of the torsion beam.
[0007] Another core of the present application is to disclose a vehicle comprising the above-mentioned torsion beam.
[0008] To achieve the above objectives, this application provides the following technical solutions:
[0009] A torsion beam comprising:
[0010] beam;
[0011] longitudinal arms, the longitudinal arms being arranged at both ends of the crossbeam, and each longitudinal arm being provided with an elastic member mounting structure;
[0012] A crossbeam reinforcement plate, which is arranged between the crossbeam, the longitudinal arm and the elastic member mounting structure. The crossbeam reinforcement plate includes a first reinforcement plate and a second reinforcement plate connected to each other. The first reinforcement plate is respectively connected to the crossbeam, the longitudinal arm and the elastic member mounting structure. The second reinforcement plate is respectively connected to the first reinforcement plate and the crossbeam. The second reinforcement plate is a bent extension section of the first reinforcement plate. The angle between the second reinforcement plate and the vertical direction is 8°. The transverse length of the crossbeam reinforcement plate is 356 mm.
[0013] Optionally, in the above-mentioned torsion beam, the second reinforcing plate extends toward the center of the crossbeam and warps upward along the vertical direction, and the inner side surface of the second reinforcing plate is in a concave arc shape.
[0014] Optionally, in the above-mentioned torsion beam, the curvature radius of the second reinforcing plate is at least 6 times the thickness of the second reinforcing plate; and / or the highest point of the top surface of the second reinforcing plate is flush with or lower than the top surface of the beam.
[0015] Optionally, in the above-mentioned torsion beam, the size of the second reinforcing plate gradually decreases from close to the first reinforcing plate to away from the first reinforcing plate.
[0016] Optionally, in the above-mentioned torsion beam, along the extension direction of the longitudinal arm, the second reinforcing plate has a first side and a second side, and both the first side and the second side are curved arc structures.
[0017] Optionally, in the above-mentioned torsion beam, the first reinforcing plate and the second reinforcing plate transition through an arc surface.
[0018] Optionally, in the above-mentioned torsion beam, the elevation of the top surface of the first reinforcing plate gradually increases from the end of the beam to the center of the beam.
[0019] Optionally, in the above-mentioned torsion beam, the first reinforcing plate has side edges that cooperate with the cross beam, the longitudinal arm and the elastic member mounting structure.
[0020] Optionally, in the above-mentioned torsion beam, each of the longitudinal arms is provided with a bushing, a shock absorber bracket and a wheel mounting plate.
[0021] A vehicle comprises the above-mentioned torsion beam.
[0022] It can be seen from the above scheme that the torsion beam disclosed in the present application can change the force transmission of the longitudinal arm-beam reinforcement plate-beam by changing the angle of the second reinforcement plate of the beam reinforcement plate relative to the vertical direction, and can reduce the stress borne by the end position of the connection between the beam reinforcement plate and the beam, and reduce the occurrence of fatigue failure and cracking in the weld at the connection position between the beam reinforcement plate and the beam, thereby extending the service life of the torsion beam, improving the fatigue life of the torsion beam, and ensuring the reliability of the torsion beam under the fatigue working load of the torsion test bench. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0024] Figure 1 The structure of the torsion beam disclosed in the embodiment of this application is shown in FIG. Figure 1 ;
[0025] Figure 2 The structure of the torsion beam disclosed in the embodiment of this application is shown in FIG. Figure 2 ;
[0026] Figure 3 The structure of the torsion beam disclosed in the embodiment of this application is shown in FIG. Figure 3 ;
[0027] Figure 4 The structure of the torsion beam disclosed in the embodiment of this application is shown in FIG. Figure 4 ;
[0028] Figure 5 This is a schematic structural diagram of the beam reinforcement plate disclosed in an embodiment of the present application;
[0029] Figure 6 This is a graph showing the fatigue life and angle of the torsion beam disclosed in an embodiment of the present application.
[0030] Among them, 10 is a crossbeam, 20 is a longitudinal arm, 30 is a crossbeam reinforcement plate, 31 is a first reinforcement plate, 32 is a second reinforcement plate, 321 is a first side, 322 is a second side, 40 is an elastic member mounting structure, 50 is a wheel mounting plate, 60 is a shock absorber bracket, and 70 is a bushing. DETAILED DESCRIPTION
[0031] The core of this application is to disclose a torsion beam to improve the fatigue life of the torsion beam.
[0032] Another core of the present application is to disclose a vehicle comprising the above-mentioned torsion beam.
[0033] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0034] like Figure 1 As shown, the embodiment of the present application discloses a torsion beam, including a crossbeam 10, a longitudinal arm 20 and a crossbeam reinforcement plate 30, wherein the crossbeam 10 extends in the left-right direction of the vehicle, and the longitudinal arm 20 extends in the front-back direction of the vehicle. The longitudinal arms 20 are arranged at both ends of the crossbeam 10, and each longitudinal arm 20 is provided with an elastic member mounting structure 40, which is arranged on the inner side of the longitudinal arm 20 for mounting an elastic buffer member. The crossbeam reinforcement plate 30 is located on the inner side of the longitudinal arm 20, and is arranged between the crossbeam 10, the longitudinal arm 20 and the elastic member mounting structure 40. The crossbeam reinforcement plate 30 includes a first reinforcement plate 31 and a second reinforcement plate 32, as shown in FIG. Figure 2 As shown, the first reinforcing plate 31 is welded to the crossbeam 10, the longitudinal arm 20 and the elastic member mounting structure 40 respectively, the second reinforcing plate 32 is connected to the first reinforcing plate 31 and the crossbeam 10 respectively, and is welded to the crossbeam 10. The second reinforcing plate 32 is a bent extension section of the first reinforcing plate 31. The angle between the second reinforcing plate 32 and the vertical direction is 8°, and the transverse length of the second reinforcing plate 32 is 356 mm.
[0035] It should be noted that the angle here is the complementary angle between the normal vector of the second reinforcing plate 32 and the vertical direction, that is, Figure 3 As shown in b, the vertical direction here refers to the direction of gravity. The crossbeam reinforcement plate 30 is preferably made by stamping from sheet metal, that is, the first reinforcement plate 31 and the second reinforcement plate 32 are integrally formed, and the angle between the second reinforcement plate 32 and the vertical direction is 8°. The tolerance of the bending angle can be implemented in accordance with the industry standard of the stamping industry. The transverse length of the crossbeam reinforcement plate 30 refers to the length along the extension direction of the crossbeam 10, that is, the distance from the end close to the longitudinal arm 20 to the end away from the longitudinal arm 20, as shown in FIG. Figure 3 L shown in Y .
[0036] The torsion beam disclosed in the embodiment of the present application can change the force transmission of the longitudinal arm 20-beam reinforcement plate 30-beam 10 (the force transmission direction is sequentially from the longitudinal arm 20 to the beam reinforcement plate 30 and then to the beam 10) by changing the angle between the second reinforcement plate 32 of the beam reinforcement plate 30 and the vertical direction. This can reduce the stress at the connection end position of the beam reinforcement plate 30 and the beam 10, and reduce the occurrence of fatigue failure cracking in the weld at the connection position of the beam reinforcement plate 30 and the beam 10, thereby extending the service life of the torsion beam, improving the fatigue life of the torsion beam, and ensuring the reliability of the torsion beam under the fatigue working load of the torsion test bench.
[0037] In order to verify that changing the angle between the second reinforcing plate 32 and the vertical direction can optimize the force transmission and reduce the stress at the end of the connection position between the cross beam reinforcing plate 30 and the cross beam 10, the applicant conducted CAE simulation analysis and torsion bench fatigue test. The specific data are shown in Table 1. The applicant adjusted the inclination angle of the second reinforcing plate 32 with the vertical direction in a gradient grouping manner. CAE simulation analysis and torsion bench fatigue test were performed for the angles between the second reinforcing plate 32 and the vertical direction of 44°, 35°, 26°, 17° and 8°, respectively. The stress at the end connection position of the cross beam reinforcing plate 30 and the cross beam 10 corresponding to each angle and the fatigue life of the torsion beam were obtained. The fatigue life of the torsion beam and the angle curve are shown in FIG. Figure 6 As shown in Table 1 and Figure 6 As can be seen from the figure, the smaller the angle between the second reinforcing plate 32 and the vertical direction, the smaller the transverse length of the beam reinforcing plate 30, and the longer the fatigue life of the torsion beam. Figure 3 As shown in b), the transverse length of the beam reinforcement plate 30 is 356 mm, the maximum stress is 141.02 MPa, and the fatigue life of the torsion beam is 440,000 times. Compared with the second reinforcement plate 32, the angle between the second reinforcement plate 32 and the vertical direction is 44°. Figure 4 As shown in a, the transverse length of the crossbeam reinforcement plate 30 is 406 mm, the maximum stress is 235.79 MPa, and the fatigue life of the torsion beam is 19,400 cycles. The stress is reduced by 94.77 MPa, a 40.1% reduction, and the fatigue life is increased by approximately 22.7 times, a significant effect. Simultaneously, the transverse length of the crossbeam reinforcement plate 30 is reduced by 90 mm. This reduction in the transverse length of the crossbeam reinforcement plate 30 shortens the weld length, reduces the weight of the crossbeam reinforcement plate 30, and thus reduces the weight of the torsion beam. According to weighing, the torsion beam can be reduced by 0.32 kg, achieving a lightweight design for the torsion beam and lowering its cost.
[0038] Table 1 Angle between the second reinforcement plate and the vertical direction, L Y Comparison table with CAE stress
[0039]
[0040] Furthermore, in the torsion beam disclosed in the embodiment of the present application, the cross section of the beam 10 is preferably closed, that is, a closed torsion beam.
[0041] Furthermore, if Figure 1 and Figure 5 As shown, the second reinforcing plate 32 extends toward the center of the crossbeam 10 and is tilted upward in the vertical direction. The inner surface of the second reinforcing plate 32 is concave arc-shaped, that is, the second reinforcing plate 32 is recessed toward the side of the crossbeam reinforcing plate 30 close to the longitudinal arm 20. This structural setting of the second reinforcing plate 32 can disperse stress, reduce the stress on the weld at the connection position between the crossbeam reinforcing plate 30 and the crossbeam 10, and reduce the possibility of weld cracking and failure.
[0042] Furthermore, the radius of curvature (R) of the second reinforcing plate 32 is at least six times the thickness (d) of the second reinforcing plate 32 , i.e., R ≥ 6d, and / or the highest point of the top surface of the second reinforcing plate 32 is flush with or lower than the top surface of the crossbeam 10 , i.e., the elevation of the highest point of the top surface of the second reinforcing plate 32 is ≤ the elevation of the top surface of the crossbeam 10. It should be noted that the thickness of the crossbeam reinforcing plate 30 remains consistent, i.e., the thickness of the first reinforcing plate 31 and the second reinforcing plate 32 are the same.
[0043] Furthermore, if Figure 1 and Figure 5 As shown, the size of the second reinforcing plate 32 gradually decreases from close to the first reinforcing plate 31 to away from the first reinforcing plate 31, that is, the second reinforcing plate 32 has a tapered shape. This setting can avoid sudden changes in cross-section, reduce stress, and optimize stress distribution.
[0044] Furthermore, if Figure 5 As shown, along the extension direction of the longitudinal arm 20, the second reinforcing plate 32 has a first side 321 and a second side 322, and the first side 321 and the second side 322 are both curved arc structures, as shown in FIG. Figure 1 and Figure 2 As shown, the first side 321 is connected to the crossbeam 10 , and the arrangement of the arc-shaped structure can optimize the distribution of force and reduce stress concentration.
[0045] Furthermore, the first reinforcing plate 31 and the second reinforcing plate 32 transition through an arc surface, which can optimize the transmission of force.
[0046] Furthermore, if Figure 5As shown, the elevation of the first reinforcing plate 31 gradually increases from the end of the crossbeam 10 to the center of the crossbeam 10, that is, the surface of the first reinforcing plate 31 is a curved structure. At the same time, the side of the first reinforcing plate 31 away from the longitudinal arm 20 is an arc-shaped structure. This method can better guide and transfer loads, reduce stress concentration, reduce stress amplitude, and improve the fatigue life of the torsion beam.
[0047] Further, if Figure 5 As shown, the first reinforcement plate 31 has side edges that cooperate with the crossbeam 10 , the longitudinal arm 20 and the elastic member mounting structure 40 to facilitate welding of the crossbeam reinforcement plate 30 with the crossbeam 10 , the longitudinal arm 20 and the elastic member mounting structure 40 .
[0048] Further, if Figure 1 As shown, each longitudinal arm 20 is provided with a bushing 70, a shock absorber bracket 60 and a wheel mounting plate 50. Specifically, the bushing 70 is provided at the end of the longitudinal arm 20 and can be hinged to the vehicle body. The shock absorber bracket 60 is connected to the elastic member mounting structure 40 for installing the shock absorber. The wheel mounting plate 50 is detachably connected to the longitudinal arm 20 (such as by bolt connection) or non-detachably connected (such as welding connection). The wheel mounting plate 50 is used to install the wheel hub mounting seat.
[0049] In addition, an embodiment of the present application also discloses a vehicle, including the above-mentioned torsion beam.
[0050] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.
[0051] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.
[0052] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.
[0053] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of the claims of this application.
Claims
1. A torsion beam, characterized in that: include: beam (10); Longitudinal arms (20), the longitudinal arms (20) being arranged at both ends of the crossbeam (10), and each longitudinal arm (20) being provided with an elastic member mounting structure (40); A crossbeam reinforcement plate (30), the crossbeam reinforcement plate (30) is arranged between the crossbeam (10), the longitudinal arm (20) and the elastic member mounting structure (40), the crossbeam reinforcement plate (30) includes a first reinforcement plate (31) and a second reinforcement plate (32) connected to each other, the first reinforcement plate (31) is respectively connected to the crossbeam (10), the longitudinal arm (20) and the elastic member mounting structure (40), the second reinforcement plate (32) is respectively connected to the first reinforcement plate (31) and the crossbeam (10), the second reinforcement plate (32) is a bent extension section of the first reinforcement plate (31), the angle between the second reinforcement plate (32) and the vertical direction is 8°, and the transverse length of the crossbeam reinforcement plate (30) is 356 mm.
2. The torsion beam according to claim 1, wherein: The second reinforcing plate (32) extends toward the center of the crossbeam (10) and warps upward in a vertical direction, and the inner surface of the second reinforcing plate (32) is in a concave arc shape.
3. The torsion beam according to claim 1, wherein: The radius of curvature of the second reinforcing plate (32) is at least 6 times the thickness of the second reinforcing plate (32); and / or the highest point of the top surface of the second reinforcing plate (32) is flush with or lower than the top surface of the crossbeam (10).
4. The torsion beam according to claim 1, wherein: The size of the second reinforcing plate (32) gradually decreases from a direction close to the first reinforcing plate (31) to a direction away from the first reinforcing plate (31).
5. The torsion beam according to claim 1, wherein: Along the extension direction of the longitudinal arm (20), the second reinforcing plate (32) has a first side edge (321) and a second side edge (322), and both the first side edge (321) and the second side edge (322) are curved arc structures.
6. The twist beam according to claim 1, wherein: The first reinforcing plate (31) and the second reinforcing plate (32) transition through an arc surface.
7. The torsion beam according to claim 1, wherein: From the end of the crossbeam (10) to the center of the crossbeam (10), the top surface elevation of the first reinforcing plate (31) gradually increases.
8. The twist beam according to claim 1, wherein: The first reinforcing plate (31) has side edges that cooperate with the crossbeam (10), the longitudinal arm (20) and the elastic member mounting structure (40).
9. The torsion beam according to any one of claims 1 to 8, wherein: Each of the longitudinal arms (20) is provided with a bushing (70), a shock absorber bracket (60) and a wheel mounting plate (50).
10. A vehicle, characterized in that: The invention comprises a torsion beam as claimed in any one of claims 1 to 9.