Torsion beam suspension structure

Abstract

The utility model relates to the technical field of automobiles, and discloses a torsion beam suspension structure which comprises a torsion beam trailing arm, a steering knuckle, a steering pull rod and a plurality of ball bushings, and the steering knuckle is connected with the torsion beam trailing arm through the ball bushings. The multiple ball bushings are arranged at intervals in the Z direction, and the central axes of the ball bushings extend in the X direction and are parallel to one another. The steering pull rod is connected to one end, in the X direction, of the steering knuckle and used for applying push-pull force to the steering knuckle and driving the steering knuckle to rotate around the axis parallel to the Z direction relative to the torsion beam trailing arm. According to the torsion beam suspension structure, the steering knuckle is connected with the torsion beam trailing arm through the plurality of ball bushings, so that the steering knuckle can rotate around the Z direction, the minimum turning radius is reduced, and the control performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile, in particular to a kind of torsion beam suspension structure. BACKGROUND

[0002] At present, with the rapid development of automobile industry, user puts forward higher requirements to the vehicle's maneuverability and control stability. Rear wheel steering technology can improve lane-changing stability at high speed, effectively reduce the minimum turning diameter of the whole vehicle, and improve flexibility under urban low-speed working conditions, so it is gradually popularized from high-end vehicles to ordinary household vehicles.

[0003] However, the ordinary torsion beam rear suspension widely used in economy and compact household vehicles usually rigidly integrates or fixedly connects rear wheel steering knuckle and torsion beam trailing arm, and the whole does not have active or passive rear wheel steering function. Since the steering knuckle is completely constrained, it cannot realize the relative rotation of the rear wheel around the vertical (Z-direction) axis, resulting in large minimum turning radius and low control performance of the vehicle when turning. SUMMARY

[0004] The utility model provides a kind of torsion beam suspension structure, steering knuckle is connected with torsion beam trailing arm by multiple ball head bushings, so that steering knuckle can rotate around Z direction, thereby reducing minimum turning radius and improving control performance.

[0005] To achieve the above purpose, the utility model provides a kind of torsion beam suspension structure, with X direction, Y direction and Z direction perpendicular to each other, comprising torsion beam trailing arm, steering knuckle, steering tie rod and multiple ball head bushings,

[0006] The steering knuckle is connected with the torsion beam trailing arm by multiple ball head bushings;

[0007] Multiple ball head bushings are arranged along the Z direction, and the center axis of each ball head bushing extends along the X direction and is parallel to each other;

[0008] The steering tie rod is connected to one end of the steering knuckle in the X direction, for applying push-pull force to the steering knuckle, driving the steering knuckle to rotate relative to the torsion beam trailing arm around the axis parallel to the Z direction.

[0009] As a preferred scheme, the ball head bushing includes a ball head and a steering shell;

[0010] The two ends of the ball head along the X direction are connected with the torsion beam trailing arm respectively;

[0011] The steering knuckle is connected with the steering shell, the steering shell is sleeved on the outer periphery of the ball head, and the steering shell is connected with the ball head around the Z direction.

[0012] The ball head comprises a ball head body and a connecting rod.

[0013] The ball head body is connected with the connecting rod at both ends in the X direction, and the ball head body is connected with the twist beam lower arm through the connecting rod.

[0014] The steering shell is arranged on the outer periphery of the ball head body.

[0015] The steering shell is provided with a steering cavity, and the steering cavity is provided with a matching spherical surface matched with the outer surface of the ball head body.

[0016] The size of the matching spherical surface in the X direction is smaller than the size of the ball head body in the X direction.

[0017] The ball head bushing further comprises a protective cover.

[0018] The protective cover is arranged outside the connecting rod, one end of the protective cover is connected with the steering shell, and the other end is connected with the end of the connecting rod away from the ball head body.

[0019] The twist beam lower arm is provided with a connecting bracket, the connecting bracket comprises a first mounting ear and a second mounting ear arranged at intervals in the X direction, and a connecting cavity for accommodating the ball head bushing is formed between the first mounting ear and the second mounting ear.

[0020] The first mounting ear and the second mounting ear are connected with the connecting rod through connecting pieces.

[0021] The twist beam lower arm is further provided with a support plate, the number of the connecting brackets corresponds to the number of the ball head bushings, and a plurality of the connecting brackets are arranged at intervals in the Z direction and connected to the support plate.

[0022] The knuckle is provided with a connecting through hole penetrating in the X direction at both ends in the Z direction.

[0023] Two ball head bushings are connected to the connecting through hole respectively, and are connected with the corresponding connecting bracket.

[0024] The knuckle is provided with a mounting portion for mounting a hub bearing, and the mounting portion is located on the side of the knuckle away from the twist beam lower arm.

[0025] The twist beam cross beam extends in the Y direction, and the twist beam cross beam is connected with the twist beam lower arm at both ends in the Y direction.

[0026] The utility model discloses an embodiment of a torsion beam suspension structure, which has the beneficial effects that: it comprises a torsion beam longitudinal arm, a steering knuckle, a steering pull rod and a plurality of ball head bushings, wherein the steering knuckle serves as an installation carrier and a motion execution main body of a wheel and has the function of transmitting a steering action; the ball head bushings serve as flexible joints, the steering knuckle is connected to the torsion beam longitudinal arm through the plurality of ball head bushings, the steering pull rod is connected to one end of the steering knuckle in the X direction, the plurality of ball head bushings are arranged at intervals along the Z direction, the central axes of the ball head bushings are parallel to each other and extend along the X direction, and in the case of applying a push-pull force to the steering knuckle, the steering knuckle rotates relative to the torsion beam longitudinal arm around an axis parallel to the Z direction; the torsion beam longitudinal arm serves as a structural basis of a suspension and acts as a static counterforce platform during steering to ensure stable and reliable motion; and the steering pull rod serves as a driving input end, is connected to one end of the steering knuckle in the X direction, applies a push-pull force to the steering knuckle, generates a torque around the Z direction, is converted into a rear wheel deflection action, and then realizes steering of the rear wheel around the Z direction. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a whole structure schematic diagram of the utility model embodiment.

[0028] Figure 2 For Figure 1 It is an enlarged view of A in the figure.

[0029] Figure 3 It is an assembly structure schematic diagram of the steering knuckle and the ball head bushing of the utility model embodiment.

[0030] Figure 4 It is a sectional view of the ball head bushing of the utility model embodiment.

[0031] Figure 5 It is an assembly structure schematic diagram of the torsion beam longitudinal arm and the torsion beam cross arm of the utility model embodiment.

[0032] In the figure:

[0033] 10, torsion beam longitudinal arm; 11, connecting support; 12, first mounting lug; 13, second mounting lug; 14, connecting cavity; 15, supporting plate;

[0034] 20, steering knuckle; 21, connecting through hole; 22, mounting part; 23, hub bearing;

[0035] 30, steering pull rod;

[0036] 40, ball head bushing; 41, ball head; 42, ball head main body; 43, connecting rod; 44, steering shell; 45, steering cavity; 46, matching spherical surface; 47, protective cover;

[0037] 50, torsion beam cross beam; DETAILED DESCRIPTION

[0038] The specific embodiments of the present application will be further described in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0039] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like in the present application are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] In the description of the present application, it should be understood that the terms "connected", "connected", "fixed" and the like in the present application should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be weldedly connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] As shown in Figures 1 to 3 The torsion beam suspension structure of the preferred embodiment of the present application has X direction, Y direction and Z direction perpendicular to each other, and comprises a torsion beam longitudinal arm 10, a knuckle 20, a steering tie rod 30 and a plurality of ball head bushings 40.

[0042] The knuckle 20 is connected with the torsion beam longitudinal arm 10 through the plurality of ball head bushings 40.

[0043] The plurality of ball head bushings 40 are arranged along the Z direction, and the center axes of the ball head bushings 40 extend along the X direction and are parallel to each other.

[0044] The steering tie rod 30 is connected to one end of the knuckle 20 in the X direction, and is used to apply a pushing and pulling force to the knuckle 20 to drive the knuckle 20 to rotate relative to the torsion beam longitudinal arm 10 about an axis parallel to the Z direction.

[0045] The torsion beam suspension structure comprises a torsion beam trailing arm 10, a steering knuckle 20, a steering tie rod 30 and a plurality of ball head bushings 40, wherein the steering knuckle 20 serves as a mounting carrier and a motion execution main body of a wheel and has the function of transmitting a steering action; the ball head bushing 40 serves as a flexible joint, the steering knuckle 20 is connected with the torsion beam trailing arm 10 through the plurality of ball head bushings 40, the steering tie rod 30 is connected to one end of the steering knuckle 20 in the X direction, the plurality of ball head bushings 40 are arranged along the Z direction and the central axes of the ball head bushings 40 extend along the X direction and are parallel to each other, and in the case that a pushing and pulling force is applied to the steering knuckle 20, the steering knuckle 20 rotates around the Z direction; the torsion beam trailing arm 10 serves as a structural basis of the suspension and acts as a static counterforce platform during steering to ensure stable and reliable motion; and the steering tie rod 30 serves as a driving input end, is connected to one end of the steering knuckle 20 in the X direction and applies a pushing and pulling force to the steering knuckle 20 to generate a torque around the Z direction, which is converted into a rear wheel deflection action and then the rear wheel turns around the Z direction.

[0046] In the utility model, as shown in Figure 1 and Figure 5 , the spatial orientation of the torsion beam suspension structure is defined based on the whole vehicle coordinate system commonly used in the automobile industry:

[0047] The X direction is the front-rear direction of the vehicle, that is, along the length direction of the vehicle body, and is usually consistent with the driving direction of the vehicle;

[0048] The Y direction is the left-right direction of the vehicle, that is, along the width direction of the vehicle body, and points from the left side to the right side of the vehicle;

[0049] The Z direction is the up-down direction of the vehicle, that is, along the height direction of the vehicle body, and is perpendicular to the ground, and upward is positive.

[0050] The above-mentioned X, Y and Z directions are perpendicular to each other and form a right-handed orthogonal coordinate system. In the utility model, all the descriptions about the "X direction", "Y direction" and "Z direction" are based on the whole vehicle coordinate system.

[0051] Further, as shown in Figures 2 to 4 , the ball head bushing 40 comprises a ball head 41 and a steering shell 44;

[0052] The two ends of the ball head 41 along the X direction are connected with the torsion beam trailing arm 10 respectively;

[0053] The steering knuckle 20 is connected with the steering shell 44, the steering shell 44 is sleeved on the outer periphery of the ball head 41, and the steering shell 44 is rotationally connected with the ball head 41 around the Z direction. The two ends of the ball head 41 along the X direction are connected with the torsion beam trailing arm 10 respectively, can share the load and improve the structural rigidity. The steering shell 44 is sleeved on the outer periphery of the ball head 41, the steering shell 44 rotationally connects the ball head 41 around the Z direction, and the steering knuckle 20 is connected with the steering shell 44, thereby providing a rotational pair for the steering knuckle 20.

[0054] Further, as shown in Figures 2 to 4 The ball head 41 comprises a ball head body 42 and a connecting rod 43.

[0055] The ball head body 42 is connected with the connecting rod 43 at both ends in the X direction, and the ball head body 42 is connected with the twist beam lower arm 10 through the connecting rod 43, and the ball head body 42 is connected with the twist beam lower arm 10 through the connecting rod 43 to realize reliable mechanical connection.

[0056] The steering shell 44 is sleeved on the outer periphery of the ball head body 42. The ball head body 42 provides rotational support for the steering shell 44, ensuring the smoothness of rotation.

[0057] As one of the embodiments, as shown in Figure 4 The connecting rods 43 at both ends of the ball head body 42 are coaxially arranged.

[0058] As one of the embodiments, as shown in Figure 4 The connecting rod 43 is integrally formed with the body of the ball head 41.

[0059] Further, the steering shell 44 is provided with a steering cavity 45, and the steering cavity 45 is provided with a matching spherical surface 46 which is in close contact with the outer surface of the ball head body 42.

[0060] The size of the matching spherical surface 46 in the X direction is smaller than that of the ball head body 42 in the X direction. The shape of the matching spherical surface 46 corresponds to the outer surface of the ball head body 42, so that the matching spherical surface 46 and the ball head body 42 can rotate smoothly. The size of the matching spherical surface 46 in the X direction is smaller than that of the ball head body 42 in the X direction, so that the two ends of the ball head body 42 are exposed to the outside of the matching spherical surface 46 in the X direction, thereby having sufficient movement space when deflected. At the same time, when the end of the matching spherical surface 46 rotates to the position of the connecting rod 43, the connecting rod 43 limits the rotation amplitude of the steering shell 44 body, thereby realizing the angular rotation of the steering knuckle 20.

[0061] As one of the embodiments, the rotation angle of the steering knuckle 20 is set to 8° to 12°.

[0062] Further, as shown in Figure 4 The ball head bushing 40 further comprises a protective cover 47.

[0063] The protective cover 47 is sleeved on the outer side of the connecting rod 43, one end of the protective cover 47 is connected with the steering shell 44, and the other end is connected with the end of the connecting rod 43 away from the ball head body 42. The two ends of the protective cover 47 are connected with the steering shell 44 and the connecting rod 43 respectively to realize fixation. The protective cover 47 is used to seal the gap between the steering shell 44 and the twist beam lower arm 10.

[0064] As one of the embodiments, as shown inFigure 4 As shown in the drawings, the protective cover 47 is a bellows-shaped seal made of rubber or thermoplastic elastomer, one end of the protective cover 47 is fixed to the outer wall of the steering housing 44 by a clamp or a clamping groove, and the other end of the protective cover 47 is fixed to the outer end of the connecting rod 43, i.e. the end away from the ball head body 42, thereby sealing the channel between the ball head bushing 40 and the external environment and preventing contaminants from entering.

[0065] Further, as shown in the drawings, Figure 2 and Figure 5 The torsion beam trailing arm 10 is provided with a connecting bracket 11, which includes a first mounting ear 12 and a second mounting ear 13 spaced apart along the X direction, and a connecting cavity 14 formed between the first mounting ear 12 and the second mounting ear 13 for accommodating the ball head bushing 40.

[0066] The first mounting ear 12 and the second mounting ear 13 are respectively connected to the connecting rod 43 by connecting members. The connecting bracket 11 fixes the ball head bushing 40 through the first mounting ear 12 and the second mounting ear 13, providing a stable mounting platform for the connection of the ball head bushing 40, and through the double-ear structure, the stability of the connection between the ball head bushing 40 and the connecting bracket 11 is enhanced.

[0067] As one of the embodiments, as shown in the drawings, Figure 2 and Figure 5 The connecting bracket 11 is a U-shaped structure connected to the torsion beam trailing arm 10, and its internal cavity constitutes the connecting cavity 14. The ball head bushing 40 is installed in the connecting cavity 14 as a whole, and the two connecting rods 43 extend along the X direction. The connecting bracket 11 is provided with through holes penetrating along the X direction at both ends in the X direction, and the bolts as connecting members are screwed through the through holes and the matching holes at the ends of the connecting rods 43, thereby fixing the ball head bushing 40 to the torsion beam trailing arm 10.

[0068] Further, as shown in the drawings, Figure 2 and Figure 5 The torsion beam trailing arm 10 is further provided with a support plate 15, the number of connecting brackets 11 corresponds to the number of ball head bushings 40, and the plurality of connecting brackets 11 are spaced apart along the Z direction and connected to the support plate 15. The plurality of connecting brackets 11 are connected to one support plate 15 to form a whole, and the support plate 15 provides support for the connecting brackets 11, thereby improving the stability of the plurality of ball head bushings 40 and the connecting brackets 11.

[0069] As one of the embodiments, as shown in the drawings, Figure 2 and Figure 5 The support plate 15 is a steel plate, and the connecting bracket 11 is fixed to the support plate 15 by bolting or welding.

[0070] Further, as shown in the drawings, Figure 2 and Figure 3As shown, the steering knuckle 20 has connecting through holes 21 extending along the X direction at both ends in the Z direction;

[0071] The two ball head bushings 40 are respectively connected to the connecting through hole 21 and are respectively connected to the connecting bracket 11 at the corresponding position.

[0072] The steering knuckle 20 has a connecting through hole 21 at its upper and lower ends in the Z direction, and a connecting through hole 21 in the X direction. The steering knuckle 20 is fitted onto the outer periphery of the steering housing 44 of the upper ball joint bushing 40 through the connecting through hole 21 at the upper end, so as to realize the connection between the upper end of the steering knuckle 20 and the upper ball joint bushing 40. The connecting rod 43 of the upper ball joint bushing 40 is connected to the upper connecting bracket 11. The steering knuckle 20 is fitted onto the outer periphery of the steering housing 44 of the lower ball joint bushing 40 through the connecting through hole 21 at the lower end, so as to realize the connection between the lower end of the steering knuckle 20 and the lower ball joint bushing 40. The connecting rod 43 of the lower ball joint bushing 40 is connected to the lower connecting bracket 11. The two ball joint bushings 40 together form an upper and lower double hinge point, which allows the steering knuckle 20 to deflect around the Z direction, while constraining other degrees of freedom.

[0073] Furthermore, such as Figure 2 and Figure 3 As shown, the steering knuckle 20 is provided with a mounting portion 22 for mounting the wheel hub bearing 23. The mounting portion 22 is located on the side of the steering knuckle 20 away from the torsion beam longitudinal arm 10. The two ends of the steering knuckle 20 in the Z direction are connected to the torsion beam longitudinal arm 10 through ball joint bushings 40. The side of the steering knuckle 20 away from the torsion beam longitudinal arm 10 is provided with a flange-shaped mounting portion 22 for mounting the wheel hub bearing 23, which is used to fix the wheel hub bearing 23 and the wheel.

[0074] Furthermore, such as Figure 5 As shown, it also includes a torsion beam crossbeam 50, which extends along the Y direction. Torsion beam longitudinal arms 10 are connected to both ends of the torsion beam crossbeam 50 in the Y direction. The torsion beam crossbeam 50 is arranged along the Y direction, and the torsion beam longitudinal arms 10 are rigidly connected to both ends of the torsion beam crossbeam 50 in the Y direction. The torsion beam longitudinal arms 10 are hinged to the steering knuckle 20 via ball joint bushings 40. A wheel hub bearing 23 and a wheel are mounted on the outer end of the steering knuckle 20.

[0075] In summary, this utility model embodiment provides a torsion beam suspension structure, including a torsion beam trailing arm 10, a steering knuckle 20, a steering tie rod 30, and multiple ball joint bushings 40. The steering knuckle 20 serves as the mounting carrier and motion actuator for the wheel, transmitting steering motion. The ball joint bushings 40 act as flexible joints. The steering knuckle 20 is connected to the torsion beam trailing arm 10 via multiple ball joint bushings 40. The steering tie rod 30 is connected to one end of the steering knuckle 20 in the X direction. The multiple ball joint bushings 40 are spaced apart along the Z direction. The central axes of each ball joint bushing 40 extend along the X direction and are parallel to each other. When a push-pull force is applied to the steering knuckle 20, the steering knuckle 20 rotates around the Z direction. The torsion beam longitudinal arm 10 serves as the structural foundation of the suspension and acts as a static reaction platform during steering to ensure stable and reliable movement. The steering tie rod 30 serves as the drive input end, connected to one end of the steering knuckle 20 in the X direction, and applies a push-pull force to the steering knuckle 20 to generate torque around the Z direction, which is converted into rear wheel deflection action, thereby realizing rear wheel steering around the Z direction.

[0076] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.

Claims

1. A torsion beam suspension structure having mutually perpendicular X, Y, and Z directions, characterized in that: Includes a torsion beam trailing arm (10), a steering knuckle (20), a steering tie rod (30), and multiple ball joint bushings (40). The steering knuckle (20) is connected to the torsion beam longitudinal arm (10) via a plurality of ball joint bushings (40); The plurality of ball head bushings (40) are arranged at intervals along the Z direction, and the central axis of each ball head bushing (40) extends along the X direction and is parallel to each other; The steering tie rod (30) is connected to one end of the steering knuckle (20) in the X direction and is used to apply a push-pull force to the steering knuckle (20) to drive the steering knuckle (20) to rotate relative to the torsion beam longitudinal arm (10) about an axis parallel to the Z direction.

2. The torsion beam suspension structure according to claim 1, characterized in that: The ball head bushing (40) includes a ball head (41) and a steering housing (44); The two ends of the ball head (41) along the X direction are respectively connected to the longitudinal arm (10) of the torsion beam; The steering knuckle (20) is connected to the steering housing (44), which is sleeved on the outer periphery of the ball joint (41) and is rotatably connected to the ball joint (41) about the Z direction.

3. The torsion beam suspension structure according to claim 2, characterized in that: The ball head (41) includes a ball head body (42) and a connecting rod (43); The ball head body (42) is connected to the connecting rods (43) at both ends in the X direction, and the ball head body (42) is connected to the longitudinal arm (10) of the torsion beam through the connecting rods (43); The steering housing (44) is fitted around the outer periphery of the ball head body (42).

4. The torsion beam suspension structure according to claim 3, characterized in that: The steering housing (44) is provided with a steering cavity (45), and the steering cavity (45) has a mating spherical surface (46) that fits against the outer surface of the ball head body (42); The size of the mating spherical surface (46) in the X direction is smaller than the size of the ball head body (42) in the X direction.

5. The torsion beam suspension structure according to claim 3, characterized in that: The ball head bushing (40) also includes a protective cover (47); The protective cover (47) is placed on the outside of the connecting rod (43). One end of the protective cover (47) is connected to the steering shell (44), and the other end is connected to the end of the connecting rod (43) away from the ball head body (42).

6. The torsion beam suspension structure according to claim 3, characterized in that: The longitudinal arm (10) of the torsion beam is provided with a connecting bracket (11), the connecting bracket (11) includes a first mounting ear (12) and a second mounting ear (13) spaced apart along the X direction, and a connecting cavity (14) for accommodating the ball head bushing (40) is formed between the first mounting ear (12) and the second mounting ear (13); The first mounting ear (12) and the second mounting ear (13) are respectively connected to the connecting rod (43) via connectors.

7. The torsion beam suspension structure according to claim 6, characterized in that: The longitudinal arm (10) of the torsion beam is also provided with a support plate (15). The number of the connecting brackets (11) corresponds one-to-one with the number of the ball head bushings (40), and multiple connecting brackets (11) are spaced apart along the Z direction and connected to the support plate (15).

8. The torsion beam suspension structure according to claim 7, characterized in that: The steering knuckle (20) has connecting through holes (21) extending along the X direction at both ends in the Z direction; The two ball head bushings (40) are respectively connected to the connecting through hole (21) and respectively connected to the connecting bracket (11) at the corresponding position.

9. The torsion beam suspension structure according to claim 1, characterized in that: The steering knuckle (20) is provided with a mounting part (22) for mounting a hub bearing (23), the mounting part (22) being located on the side of the steering knuckle (20) away from the longitudinal arm (10) of the torsion beam.

10. The torsion beam suspension structure according to claim 1, characterized in that: It also includes a torsion beam crossbeam (50), which extends along the Y direction, and the torsion beam crossbeam (50) is connected to the torsion beam longitudinal arm (10) at both ends of the torsion beam crossbeam (50) in the Y direction.

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