Rigidity-variable torsion bar spring suspension and vehicle

Abstract

The utility model relates to the field of torsion bar spring suspensions, and discloses a variable-rigidity torsion bar spring suspension and a vehicle, which comprise a swing arm, a torsion bar spring, a fixed support seat, a torsion support seat, a first torsion limiting support seat, a first torsion limiting bump, a second torsion limiting support seat, a second torsion limiting bump and a frame, one end of the swing arm is fixedly connected with one end of the torsion rod spring in an L shape, the other end of the torsion rod spring is detachably connected with the fixed supporting seat, and the fixed supporting seat is fixedly connected with the frame; the torsion supporting seat is rotationally arranged at one end, close to the swing arm, of the torsion rod spring, and the torsion supporting seat is fixedly connected with the frame; the first torsion limiting protruding block is fixedly arranged on the side, close to the fixed supporting base, of the torsion rod spring. According to the utility model, the functions of vehicle torsion bar spring suspension rigidity adjustment and vehicle body height adjustment can be realized.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts, in particular to a variable stiffness torsion bar spring suspension. Background Art

[0002] The main component of an automotive torsion bar spring suspension is a torsionally elastic rod made of alloy spring steel, called a torsion bar spring. One end of the torsion bar spring is fixed to the vehicle frame, and the other end is connected to the wheel's swing arm. When the wheel bounces, the vertical vibration generated is transmitted to the torsion bar spring through the swing arm, causing the torsion bar spring to deform elastically along its axis. This acts as a buffer, ensuring an elastic connection between the wheel and the frame, and improving the vehicle's handling stability and ride comfort.

[0003] CN 211117307 U discloses a variable-rigidity automobile torsion bar spring, comprising a first torsion bar and a second torsion bar, wherein a connecting rod is welded to the right side of each of the first torsion bar and the second torsion bar, round rods are welded to the front and rear ends of the outer walls of the connecting rods, the outer walls of the round rods are interference-fitted with the inner ring of a bearing, the outer ring of the bearing is fixedly connected to a support seat via a bearing seat, a third torsion bar and a buffer mechanism are welded between the inner sides of the support seats, and the buffer mechanism is arranged on the right side of the top end of the connecting rod.

[0004] The advantages of the existing torsion bar spring suspension are simple structure and small space occupation, which is especially suitable for small cars. The disadvantage is that the torsional stiffness is determined by the physical structure of the torsion bar spring and cannot change with the change of the torsion angle. The contradiction between ride comfort and handling stability cannot be reconciled, which reduces the convenience and practicality of using the torsion bar spring. Utility Model Content

[0005] During the use of the vehicle, the degree of wheel bumping or vehicle roll changes at any time due to factors such as uneven road surface and centrifugal force when the vehicle turns. The ideal mechanical characteristics of a torsion spring suspension are that when the suspension displacement is small (the torsion spring torsion angle is small), the torsional stiffness is small to improve ride comfort, and when the suspension displacement is large (the torsion angle is large), the torsional stiffness is large to reduce the degree of body roll and improve vehicle handling stability. In addition, different vehicle body heights (ground clearance of the chassis) directly affect the vehicle's passability and operational stability. However, the stiffness of the existing torsion bar spring suspension is determined by the physical structure of the torsion bar spring and cannot change with changes in the torsion angle. The vehicle body height is also not easy to adjust. In order to solve the above technical problems, the present application proposes a variable stiffness torsion bar spring suspension, including:

[0006] A swing arm, a torsion bar spring, a fixed support seat, a torsion support seat, a torsion bushing and a vehicle frame, wherein one end of the swing arm is fixedly connected to one end of the torsion bar spring in an "L" shape, and the other end of the swing arm is mounted with a wheel that freely jumps along the Z direction, and the other end of the torsion bar spring is detachably connected to the fixed support seat, and the fixed support seat is fixedly connected to the vehicle frame; the torsion support seat is rotatably arranged on the torsion bar spring close to one end of the swing arm, and has a guiding and supporting effect on the torsion bar spring, the torsion support seat is fixedly connected to the vehicle frame, and the torsion bushing is arranged between the torsion support seat and the torsion bar spring, and reduces direct friction between the torsion bar spring and the torsion support seat;

[0007] The variable stiffness torsion bar spring suspension further includes a first torsion limiting support seat and a first torsion limiting protrusion, wherein the first torsion limiting protrusion is fixedly arranged on a side of the torsion bar spring close to the fixed support seat, the first torsion limiting support seat is provided with a groove that matches the first torsion limiting protrusion and can limit the first torsion limiting protrusion to rotate around the axis by an angle of ±α1, and the first torsion limiting support seat is fixedly connected to the vehicle frame;

[0008] The variable stiffness torsion bar spring suspension also includes a second torsion limiting support seat and a second torsion limiting protrusion. The second torsion limiting protrusion is fixedly arranged on one side of the torsion bar spring close to the torsion supporting seat. The second torsion limiting support seat is provided with a groove that cooperates with the second torsion limiting protrusion, which can limit the second torsion limiting protrusion to rotate around the axis at an angle of ±α2. The second torsion limiting support seat is fixedly connected to the vehicle frame, and the angle value α1 is less than the angle value α2.

[0009] Preferably, the length between the fixed support seat and the swing arm is S1, the length between the first torsion limiting support seat and the swing arm is S2, the length between the second torsion limiting support seat and the swing arm is S3, and S2=2 / 3S1, S3=1 / 3S1.

[0010] Preferably, the first torsion limiting protrusion is evenly distributed along the circumference of a plurality of fan-shaped bosses, and the first torsion limiting support seat is evenly distributed along the circumference of the inner hole with the same number of fan-shaped grooves, the angle β1 of the fan-shaped boss is smaller than the angle θ1 of the fan-shaped groove, and satisfies θ1-β1=2α1.

[0011] Preferably, the second torsion limiting protrusion is evenly distributed along the circumference of a plurality of fan-shaped bosses, and the second torsion limiting support seat is evenly distributed along the circumference of the inner hole with the same number of fan-shaped grooves, the angle β2 of the fan-shaped boss is smaller than the angle θ2 of the fan-shaped groove, and satisfies θ2-β2=2α2.

[0012] Preferably, the first torsion limiting protrusion is provided with four fan-shaped bosses, and the second torsion limiting protrusion is provided with four fan-shaped bosses.

[0013] Preferably, the angle α1 is 10°, and the angle α2 is 15°.

[0014] Preferably, the torsion bar spring and the fixed support seat are fixedly connected by a spline, and the end of the torsion bar spring is axially fixed by a washer and a locking nut.

[0015] The utility model also provides a vehicle, which includes the variable stiffness torsion bar spring suspension.

[0016] The beneficial effects of the utility model are:

[0017] The variable-stiffness torsion bar spring suspension provided by the utility model is fixedly connected in an L-shape by one end of the swing arm and one end of the torsion bar spring. The other end of the torsion bar spring is detachably connected to the fixed support seat via a spline. The vehicle body height can be adjusted by adjusting the mating tooth position of the spline. When the suspension displacement is small, the entire length of the torsion bar participates in torsional deformation, resulting in a low suspension equivalent stiffness. Furthermore, by providing the first torsion-limiting support seat and the first torsion-limiting protrusion, the variable-stiffness torsion bar spring suspension provided by the utility model achieves a medium suspension displacement with two-thirds of the torsion bar length participating in torsional deformation. Furthermore, by providing the second torsion-limiting support seat and the second torsion-limiting protrusion, the variable-stiffness torsion bar spring suspension provided by the utility model achieves a maximum suspension equivalent stiffness with one-third of the torsion bar length participating in torsional deformation during large wheel travel. The variable-stiffness torsion bar spring suspension achieves three-level adjustment of suspension stiffness by varying the effective length of the torsion bar spring at different torsion angles, effectively balancing the contradiction between ride comfort and handling stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the structure of a common torsion bar spring installed on a vehicle suspension;

[0020] Figure 2 3-D view of the variable stiffness torsion bar spring suspension of the present invention;

[0021] Figure 3 1 is a front view of the variable stiffness torsion bar spring suspension of the present invention;

[0022] Figure 4 yes Figure 3 Cross-sectional view at the middle AA position

[0023] Figure 5 yes Figure 3 Cross-sectional view of the middle BB position

[0024] Figure 6 yes Figure 3 Cross-sectional view of the middle CC position

[0025] Figure 7 yes Figure 3 Cross-sectional view of the middle DD position

[0026] Figure 8 This is the suspension equivalent stiffness change curve

[0027] Description of reference numerals:

[0028] 1. Swing arm; 2. Torsion support seat; 3. Torsion bushing; 4. Second torsion limit support seat; 5. Second torsion limit protrusion; 6. First torsion limit support seat; 7. First torsion limit protrusion; 8. Torsion bar spring; 9. Fixed support seat; 10. Gasket; 11. Locking nut; 12. Spline; 13. Frame. DETAILED DESCRIPTION

[0029] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0030] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0031] See also Figure 1As shown, in the prior art, the stiffness of the torsion bar spring suspension is determined by the physical structure of the torsion bar spring, which cannot meet the requirement that the suspension stiffness changes with the change of the torsion angle, and the vehicle body height is not easy to adjust, resulting in a technical problem of not being able to effectively coordinate the vehicle's ride comfort and handling stability. In order to solve the technical problems existing in the above-mentioned prior art, the utility model provides a variable stiffness torsion bar spring suspension, as shown in Figure 2-4, the variable stiffness torsion bar spring suspension includes a swing arm 1, a torsion bar spring 8, a fixed support seat 9, a torsion support seat 2, a torsion bushing 3 and a frame 13, one end of the swing arm 1 is fixedly connected to one end of the torsion bar spring 8 in an "L" shape, the other end of the swing arm 1 is installed with a wheel that jumps freely along the z direction, the other end of the torsion bar spring 8 is detachably connected to the fixed support seat 9, and the fixed support seat 9 is fixedly connected to the frame 13; the torsion support seat 2 is rotatably arranged on the torsion bar spring 8 close to one end of the swing arm 1, the torsion support seat 2 is fixedly connected to the frame 13, and the torsion bushing 3 is arranged between the torsion support seat 2 and the torsion bar spring 8.

[0032] See also Figure 5 The variable stiffness torsion bar spring suspension further includes a first torsion limiting support seat 6 and a first torsion limiting protrusion 7. The first torsion limiting protrusion 7 is fixedly arranged on the torsion bar spring 8 on a side close to the fixed support seat 9. The first torsion limiting support seat 6 is provided with a groove that cooperates with the first torsion limiting protrusion 7, which can limit the first torsion limiting protrusion 7 to rotate around the axis by an angle of ±α1. The first torsion limiting support seat 6 is fixedly connected to the vehicle frame 13.

[0033] See also Figure 6 The variable stiffness torsion bar spring suspension also includes a second torsion limiting support seat 4 and a second torsion limiting protrusion 5. The second torsion limiting protrusion 5 is fixedly arranged on the torsion bar spring 8 on one side close to the torsion support seat 2. The second torsion limiting support seat 4 is provided with a groove that cooperates with the second torsion limiting protrusion 5, which can limit the second torsion limiting protrusion 5 to rotate around the axis at an angle of ±α2. The second torsion limiting support seat 4 is fixedly connected to the vehicle frame 13, and the angle value α1 is less than the angle value α2.

[0034] The vehicle torsion bar spring suspension satisfies the following physical relationship:

[0035]

[0036] Where α is the torsion bar spring torsion angle (rad), T is the torque applied to the torsion bar spring (N·m), S is the effective torsion bar spring torsion length (m), K is the stiffness of the torsion bar spring, which is determined by its physical structure such as material and cross-sectional shape, z is the vertical runout of the wheel (m), F is the wheel force (N), and R is the distance between the wheel axis and the torsion bar spring axis, i.e., the equivalent length of the swing arm (m).

[0037] By derivation, it can be obtained that the wheel force F and the wheel vertical runout z satisfy:

[0038]

[0039] Where, This is the equivalent stiffness of the torsion bar spring suspension.

[0040] Through analysis, it can be found that when the torsion bar spring stiffness K and the equivalent length R of the swing arm remain unchanged, the equivalent stiffness k of the torsion bar spring suspension is inversely proportional to the effective length S of the torsion bar spring torsion, that is, when the effective length S of the torsion bar spring torsion becomes smaller, the equivalent stiffness k of the torsion bar spring suspension increases.

[0041] When the torsion angle of the torsion bar spring satisfies α<α1|, the first torsion limiting support seat 6 and the first torsion limiting protrusion 7 have no torsion limiting effect, the effective torsion length S of the torsion bar spring is the length of the fixed support seat 9 and the swing arm 1, and the equivalent stiffness k of the variable stiffness torsion bar spring suspension is minimum;

[0042] When the torsion angle of the torsion bar spring satisfies |α1|≤α<α2|, the first torsion limiting support seat 6 and the first torsion limiting protrusion 7 have a torsion limiting effect, the effective torsion length S of the torsion bar spring is the length between the first torsion limiting support seat 6 and the swing arm 1, and the equivalent stiffness k of the variable stiffness torsion bar spring suspension increases;

[0043] When the torsion angle of the torsion bar spring satisfies α≥|α2|, the second torsion limiting support seat 4 and the second torsion limiting protrusion 5 have a torsion limiting effect, the effective torsion length S of the torsion bar spring is the length between the second torsion limiting support seat 4 and the swing arm 1, and the equivalent stiffness k of the variable stiffness torsion bar spring suspension is maximum;

[0044] The equivalent stiffness variation curve of the variable stiffness torsion bar spring suspension is shown in Figure 8The horizontal axis is the vertical wheel runout z, which is proportional to the torsion angle α of the torsion bar spring. The vertical axis is the wheel force F. The slope of the curve is the equivalent stiffness of the variable stiffness torsion bar spring suspension. As the vertical wheel runout z increases, the slope of the curve increases in three steps, that is, the equivalent stiffness k of the variable stiffness torsion bar spring suspension increases in three steps, thereby achieving three-level adjustment of suspension stiffness and effectively coordinating the contradiction between ride comfort and handling stability.

[0045] Preferably, the length between the fixed support seat 9 and the swing arm 1 is S1, the length between the first torsion limiting support seat 6 and the swing arm 1 is S2, the length between the second torsion limiting support seat 4 and the swing arm 1 is S3, and S2=2 / 3S1, S3=1 / 3S1.

[0046] When the effective length of the torsion bar spring is S1, the equivalent stiffness of the torsion bar spring suspension is recorded as:

[0047]

[0048] When the effective length of the torsion bar spring is S2, the equivalent stiffness of the torsion bar spring suspension is:

[0049]

[0050] When the effective length of the torsion bar spring is S3, the equivalent stiffness of the torsion bar spring suspension is:

[0051]

[0052] The equivalent stiffness k of the variable stiffness torsion bar spring suspension increases in three steps of 1 time, 1.5 times, and 3 times as the vertical bounce z of the wheel increases.

[0053] Preferably, the first torsion limiting protrusion 7 is evenly distributed along the circumference with a plurality of fan-shaped bosses, and the first torsion limiting support seat 6 is evenly distributed along the circumference of the inner hole with the same number of fan-shaped grooves, the angle β1 of the fan-shaped boss is smaller than the angle θ1 of the fan-shaped groove, and satisfies θ1-β1=2α1.

[0054] Preferably, the second torsion limiting protrusion 5 is evenly distributed along the circumference with a plurality of fan-shaped bosses, and the second torsion limiting support seat 4 is evenly distributed along the circumference of the inner hole with the same number of fan-shaped grooves, the angle β2 of the fan-shaped boss is smaller than the angle θ2 of the fan-shaped groove, and satisfies θ2-β2=2α2.

[0055] The cooperation of multiple fan-shaped bosses and fan-shaped grooves can effectively increase the contact area between the bosses and the grooves, while maintaining the coaxial relative rotation of the two, thereby improving the reliability of the structure.

[0056] Preferably, the first torsion limiting protrusion 7 is provided with four sector-shaped bosses, and the second torsion limiting protrusion 5 is provided with four sector-shaped bosses.

[0057] Preferably, the angle α1 is 10°, and the angle α2 is 15°.

[0058] Preferably, the torsion bar spring 8 and the fixed support seat 9 are fixedly connected via a spline 12 , and the end of the torsion bar spring 8 is axially fixed via a washer 10 and a locking nut 11 .

[0059] See also Figure 7 A spline shaft is provided at the end of the torsion bar spring 8, and a spline sleeve is provided in the fixed support seat 9. The vehicle body height can be adjusted by adjusting the matching tooth position of the spline shaft and the spline sleeve.

[0060] The present invention also discloses a vehicle, which includes the above-mentioned variable stiffness torsion bar spring suspension. This is to better achieve the technical effect of improving the ride comfort and handling stability of the vehicle. That is, when the vehicle is driving in a straight line on a relatively smooth road, the vertical wheel jump or the body roll angle is small, the suspension stiffness is small, and it can more gently absorb and cushion the impact of the road, reduce body vibration, reduce noise inside the vehicle, and improve the vehicle's ride comfort; when the vehicle is driving on a bumpy road or turning at high speed, the vertical wheel jump or the body roll angle is large, the suspension stiffness is large, and it can better support the body, reduce the tilt and shake of the body, keep the vehicle in a stable posture, and make the steering of the vehicle more precise and sensitive, thereby improving the vehicle's handling stability; and the vehicle can flexibly adjust the body height according to complex road conditions to adapt to different terrain requirements, thereby improving the vehicle's passability and stability.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. Variable stiffness torsion bar spring suspension, characterized in that: The variable stiffness torsion bar spring suspension comprises a swing arm (1), a torsion bar spring (8), a fixed support seat (9), a torsion support seat (2), a torsion bushing (3) and a vehicle frame (13); one end of the swing arm (1) is fixedly connected to one end of the torsion bar spring (8) in an "L" shape; the other end of the swing arm (1) is mounted on a wheel that freely jumps along the Z direction; the other end of the torsion bar spring (8) is detachably connected to the fixed support seat (9); the fixed support seat (9) is fixedly connected to the vehicle frame (13); the torsion support seat (2) is rotatably arranged on the torsion bar spring (8) near one end of the swing arm (1); the torsion support seat (2) is fixedly connected to the vehicle frame (13); the torsion bushing (3) is arranged between the torsion support seat (2) and the torsion bar spring (8); The variable stiffness torsion bar spring suspension further comprises a first torsion limiting support seat (6) and a first torsion limiting protrusion (7), wherein the first torsion limiting protrusion (7) is fixedly arranged on a side of the torsion bar spring (8) close to the fixed support seat (9), and the first torsion limiting support seat (6) is provided with a groove matched with the first torsion limiting protrusion (7), which can limit the first torsion limiting protrusion (7) to rotate around the axis by an angle of ±α1, and the first torsion limiting support seat (6) is fixedly connected to the vehicle frame (13); The variable stiffness torsion bar spring suspension further comprises a second torsion limiting support seat (4) and a second torsion limiting protrusion (5), wherein the second torsion limiting protrusion (5) is fixedly arranged on a side of the torsion bar spring (8) close to the torsion supporting seat (2), and the second torsion limiting support seat (4) is provided with a groove matched with the second torsion limiting protrusion (5), which can limit the second torsion limiting protrusion (5) to rotate around the axis by an angle of ±α2, and the second torsion limiting support seat (4) is fixedly connected to the vehicle frame (13), and the angle value α1 is smaller than the angle value α2.

2. The variable stiffness torsion bar spring suspension according to claim 1, characterized in that: The length between the fixed support seat (9) and the swing arm (1) is S1, the length between the first torsion limiting support seat (6) and the swing arm (1) is S2, and the length between the second torsion limiting support seat (4) and the swing arm (1) is S3, and they satisfy S2=2 / 3S1 and S3=1 / 3S1.

3. The variable stiffness torsion bar spring suspension according to claim 1, characterized in that: The first torsion limiting protrusion (7) is provided with a plurality of fan-shaped bosses evenly distributed along the circumference, and the first torsion limiting support seat (6) is provided with the same number of fan-shaped grooves evenly distributed along the circumference of the inner hole, and the angle β1 of the fan-shaped bosses is smaller than the angle θ1 of the fan-shaped grooves, and satisfies θ1-β1=2α1.

4. The variable stiffness torsion bar spring suspension according to claim 1, characterized in that: The second torsion limiting protrusion (5) is provided with a plurality of fan-shaped bosses evenly distributed along the circumference, and the second torsion limiting support seat (4) is provided with the same number of fan-shaped grooves evenly distributed along the circumference of the inner hole, and the angle β2 of the fan-shaped bosses is smaller than the angle θ2 of the fan-shaped grooves, and satisfies θ2-β2=2α2.

5. The variable stiffness torsion bar spring suspension according to claim 1, characterized in that: The first torsion limiting protrusion (7) is provided with four fan-shaped protrusions, and the second torsion limiting protrusion (5) is provided with four fan-shaped protrusions.

6. The variable stiffness torsion bar spring suspension according to claim 1, characterized in that: The angle α1 is 10°, and the angle α2 is 15°.

7. The variable stiffness torsion bar spring suspension according to claim 1, characterized in that: The torsion bar spring (8) and the fixed support seat (9) are fixedly connected via a spline (12), and the end of the torsion bar spring (8) is axially fixed via a washer (10) and a locking nut (11).

8. A vehicle, characterized in that: The vehicle includes the variable stiffness torsion bar spring suspension according to any one of claims 1 to 7.

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