A brake block automatic retraction mechanism, a brake device and a vehicle

Abstract

The present invention discloses an automatic retraction mechanism of a brake block, a brake device and a car, wherein the automatic retraction mechanism of the brake block comprises a brake block and a bracket, and a retraction component for generating a retraction force to make the brake block return to a direction away from a brake disc is provided between the two ends of the brake block and the bracket, and the retraction component is a retraction torsion spring, and the retraction torsion spring comprises a spring body, a first spring arm and a second spring arm; the spring body is located on the outside of the brake block, one end of the first spring arm is connected to the spring body as a whole, and the other end is provided with a clamping joint formed by bending, and is connected to the torsion spring connecting part of the brake block through the clamping joint; one end of the second spring arm is connected to the spring body as a whole, and the other end is provided with a spring tongue formed by bending, and is supported on the spring tongue contact surface of the bracket through the spring tongue. The retraction mechanism has good retraction force in different use stages, and can significantly improve the stability and reliability of the retraction mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile braking, in particular to an automatic brake block retraction mechanism of an automobile braking device, a braking device provided with the automatic brake block retraction mechanism, and an automobile provided with the braking device. Background Art

[0002] At present, the automatic retraction function of the brake pad is generally achieved by riveting an "S"-shaped friction plate return claw on the brake pad. The return claw is set in an arch shape, and the deformation of the return claw generates a force away from the brake disc, so that the brake pad does not contact the brake disc in the non-braking state.

[0003] Since the return claw is a leaf spring structure, its elastic deformation displacement is small, and therefore the working stroke of the retraction force is small, that is, in the early stage of use (small amount of brake pad wear), the preset deformation is small, the retraction force is insufficient, and the low drag effect of the brake is not good; in the later stage of use (large amount of brake pad wear), the deformation is large, and the return claw is prone to plastic deformation and even fatigue fracture problems.

[0004] In addition, the adjustable range of the retraction force of the return claw is small, and there are certain application limitations. The return claw is fixed to the brake block by riveting, and the processing is relatively complicated. Moreover, the return claw is a thin plate structure, which is easy to deform during assembly, affecting the retraction force. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic retraction mechanism for a brake block, which has good retraction force in different use stages (i.e., different wear degree periods of the brake block), and can significantly improve the stability and reliability of the retraction mechanism.

[0006] Another object of the present invention is to provide a braking device provided with the automatic retraction mechanism of the brake block.

[0007] Another object of the present invention is to provide a vehicle provided with the braking device.

[0008] To achieve the above-mentioned purpose, the present invention provides an automatic retraction mechanism for a brake block, comprising a brake block and a bracket, a return component for generating a return force to return the brake block to a direction away from the brake disc is provided between the two ends of the brake block and the bracket, the return component is a return torsion spring, and the return torsion spring comprises a spring body, a first spring arm and a second spring arm; the spring body is located on the outside of the brake block, one end of the first spring arm is connected to the spring body as a whole, and the other end is provided with a clamping joint formed by bending, and is connected to the torsion spring connecting part of the brake block through the clamping joint; one end of the second spring arm is connected to the spring body as a whole, and the other end is provided with a spring tongue formed by bending, and is supported on the spring tongue contact surface of the bracket through the spring tongue.

[0009] Preferably, the clamping joint of the first spring arm includes a "U"-shaped bending portion with an opening toward the spring body and a self-locking hook formed by reverse bending of the free end of the "U"-shaped bending portion; a positioning hole and a limiting groove are provided on the torsion spring connecting portion of the brake block, and the limiting groove is located on the outside of the torsion spring connecting portion, and its length direction is parallel to the axial direction of the positioning hole; the self-locking hook is pressed into the positioning hole from the inner side of the torsion spring connecting portion and clamped inside the positioning hole, one side of the "U"-shaped bending portion is located in the positioning hole, the other side is located in the limiting groove, and the bottom is located on the inner side of the torsion spring connecting portion.

[0010] Preferably, the inner diameter of the positioning hole is smaller than the width of the self-locking hook.

[0011] Preferably, a slot or a platform abutting against the end of the self-locking hook is provided in the positioning hole, and / or a slot corresponding to the spring tongue is provided on the contact surface of the spring tongue.

[0012] Preferably, the spring tongue of the second spring arm includes a first bending portion formed by bending in a direction close to the spring tongue contact surface and a second bending portion formed by bending in the opposite direction, and the spring tongue contacts the spring tongue contact surface through the bending portion of the second bending portion.

[0013] Preferably, the return torsion springs at both ends of the brake block are symmetrically arranged, the central axis of the spring body is parallel to the central symmetry plane of the brake block, and the first spring arm is perpendicular to the braking surface of the brake block.

[0014] Preferably, the angle between the first spring arm and the second spring arm is an obtuse angle.

[0015] Preferably, the return torsion spring is formed by bending a stainless steel wire, and the diameter of the stainless steel wire is 0.8 mm to 2.0 mm.

[0016] To achieve the other purpose mentioned above, the present invention provides a braking device, including a brake disc and a brake pad that contacts and rubs with the brake disc in a braking state, and is provided with an automatic retraction mechanism of the brake pad as described in any of the above items to keep the brake pad away from the brake disc in a non-braking state.

[0017] To achieve the above-mentioned another object, the present invention provides an automobile, including an engine, a chassis, a body and electrical equipment, wherein the chassis is provided with a braking device for braking the wheels, and the characteristic is that the braking device is a braking device provided with the above-mentioned brake pad automatic retraction mechanism.

[0018] The automatic retraction mechanism of the brake pad provided by the present invention is provided with a return torsion spring, the clamping joint of the first spring arm of the return torsion spring is connected to the torsion spring connecting part of the brake pad, and the spring tongue of the second spring arm is supported and in contact with the spring tongue of the bracket. During use after installation, the return torsion spring is torsionally deformed to generate a retraction force that can return the brake pad, thereby ensuring that the brake pad is away from the brake disc, so as to reduce the contact friction between the brake pad and the brake pad when the brake pad is not working, reduce the brake drag force, and thus achieve the purpose of reducing fuel consumption. The spring body of the return spring can ensure that the retraction mechanism has a good retraction force in different use stages (i.e., different wear degrees of the brake pad), and after the retraction stroke increases with the wear of the brake pad, the return torsion spring will not have stress concentration, plastic deformation or even fatigue fracture, thereby greatly improving the stability and reliability of the retraction mechanism.

[0019] The braking device and automobile provided by the present invention are provided with the automatic brake pad retraction mechanism. Since the automatic brake pad retraction mechanism has the above-mentioned technical effects, the braking device and automobile provided with the automatic brake pad retraction mechanism should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of an automatic retraction mechanism for a brake block disclosed in an embodiment of the present invention;

[0021] Figure 2 for Figure 1 The assembly diagram of the return torsion spring and the brake block is shown;

[0022] Figure 3 It is a cross-sectional view of the connection between the return torsion spring and the torsion spring connecting part of the brake block.

[0023] In the figure:

[0024] 1. Brake block 11. Torsion spring connection part 12. Positioning hole 13. Limiting groove 2. Bracket 21. Spring tongue contact surface 3. Return torsion spring 30. Spring body 31. First spring arm 311. "U"-shaped bending part 312. Self-locking hook 32. Second spring arm 321. First bending part 322. Second bending part DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] In this article, the terms "upper, lower, left, right" and the like are established based on the positional relationships shown in the drawings. The corresponding positional relationships may also change depending on the drawings, and therefore cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" and the like are merely used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0027] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 1 A schematic structural diagram of an automatic retraction mechanism for a brake block disclosed in an embodiment of the present invention; Figure 2 for Figure 1 The assembly diagram of the return torsion spring and the brake block is shown; Figure 3 It is a cross-sectional view of the connection between the return torsion spring and the torsion spring connecting part of the brake pad.

[0028] As shown in the figure, in a specific embodiment, the automatic retraction mechanism of the brake pad provided by the present invention is mainly composed of three parts: a brake pad 1, a bracket 2 and a return torsion spring 3. The brake pad 1 is installed on the bracket 2, and can move on the bracket 2 along the braking direction close to the brake disc and the retraction direction away from the brake disc. The return torsion spring 3 is arranged between the brake pad 1 and the bracket 2, and is used to provide the brake pad 1 with the retraction force required when returning.

[0029] The return torsion spring 3 is divided into several parts, namely a spring body 30, a first spring arm 31 and a second spring arm 32. The spring body 30 is located on the outside of the brake block 2 and is in a circular ring shape that is wound at least once. The angle between the first spring arm 31 and the second spring arm 32 is an obtuse angle. One end of the first spring arm 31 is connected to the spring body 30 as a whole, and the other end is provided with a clamping joint formed by bending, and is connected to the torsion spring connecting part 11 of the brake block 1 through the clamping joint; one end of the second spring arm 32 is connected to the spring body 30 as a whole, and the other end is provided with a spring tongue formed by bending, and is supported on the spring tongue contact surface 21 of the bracket 2 through the spring tongue.

[0030] The return torsion springs 3 at both ends of the brake block 1 are arranged symmetrically, and the first spring arms 31 of the two return torsion springs 3 are perpendicular to the braking surface of the brake block 1, and the central axis of the spring body 30 is parallel to the central symmetry plane of the brake block 1. At the same time, the central axis of the spring body 30 is parallel to the braking surface of the brake block 1 and perpendicular to the braking and withdrawal direction of the brake block 1.

[0031] Specifically, the clamping joint of the first spring arm 31 includes a "U"-shaped bending portion 311 with an opening toward the spring body and a self-locking hook 312 formed by reverse bending of the free end of the "U"-shaped bending portion. Both ends of the brake block 1 are provided with a torsion spring connecting portion 11 in the form of a support ear, and a positioning hole 12 and a limiting groove 13 are opened on the torsion spring connecting portion 11. The inner diameter of the positioning hole 12 is smaller than the width of the self-locking hook 312, and the limiting groove 13 is located on the outer side of the torsion spring connecting portion 11, and its length direction is parallel to the axial direction of the positioning hole 12. The self-locking hook 312 is pressed into and clamped in the positioning hole 12 from the inner side of the torsion spring connecting portion 11. After clamping, one side of the "U"-shaped bending portion 311 is located in the positioning hole 12, the other side is located in the limiting groove 13, and the bottom is located on the inner side of the torsion spring connecting portion 11. In the cross-sectional view, the part between the positioning hole 12 and the limiting groove 13 is located inside the "U"-shaped bending portion 311.

[0032] The self-locking hook 312 is connected to the positioning hole 12, and the limiting groove 13 restricts the first spring arm 31, so that the return torsion spring 3 and the brake block 1 can be firmly fixed. Moreover, this self-locking connection method has a simple structure and is easy to assemble.

[0033] In order to improve the clamping strength between the self-locking hook 312 and the positioning hole 12, a clamping groove or a clamping platform that can abut against the end of the self-locking hook can be processed on the inner wall of the positioning hole 12. The end of the self-locking hook 312 can be blocked by the clamping groove or the clamping platform to prevent the self-locking hook 312 from escaping from the positioning hole 12. At the same time, a clamping groove can be processed on the spring tongue contact surface 21 so that the spring tongue of the return torsion spring 3 is embedded in the clamping groove to position the spring tongue so that the spring tongue will not move in a biased manner on the spring tongue contact surface 21.

[0034] The spring tongue is formed by bending the free end of the second spring arm 32. When bending, the free end of the second spring arm 32 is first bent toward the spring tongue contact surface 21 to form a first bent portion 321, and then bent in the opposite direction to form a second bent portion 322. The opening of the second bent portion 322 faces the outside of the spring tongue contact surface 21, and the spring tongue contacts the spring tongue contact surface 21 through the bent portion of the second bent portion 322. Of course, in the actual processing process, the second bent portion 322 can also be formed first, and then the first bent portion 321 can be formed.

[0035] The return torsion spring 3 is made of stainless steel wire spring material. The diameter of the stainless steel wire spring material is 0.8mm~2.0mm. The specific size can be selected according to the product withdrawal force requirements. The use of wire to make the return torsion spring has a relatively high material utilization rate. Moreover, the use of a wire spring forming machine to make the return torsion spring 3 has high production efficiency and good part consistency.

[0036] The return torsion spring 3 is formed by bending a single wire, and its retraction force is mainly provided by the spring body of the torsion spring. The first bending portion 321 of the spring tongue can also provide a certain retraction force. The retraction force and the retraction working stroke can be controlled by adjusting the size of the rotation diameter of the spring body 30 and the number of rotations.

[0037] The diameter and number of torsion turns of the spring body 30 can be designed according to the size of the retraction force and the retraction stroke to ensure that the return torsion spring 3 does not undergo plastic deformation within the use stroke, and the deformation stress of the return torsion spring 3 is controlled within a reasonable range to ensure fatigue performance. Therefore, a larger initial retraction force can be provided to ensure that the brake pad still has a good low-drag effect in the early stage (small wear of the brake pad).

[0038] In addition, the spring height H and the length of the spring arm L of the return torsion spring 3 can also be changed to cooperate with the spring body 30 to adjust the retraction force and the retraction stroke.

[0039] The above embodiments are only some embodiments of the present invention, and are not limited thereto. On this basis, targeted adjustments can be made according to actual needs to obtain more implementation methods. For example, the angle between the first spring arm 31 and the second spring arm 32 is a right angle or an acute angle, or the spring tongue on the second spring arm 32 is bent into other shapes that can be supported on the bracket 2 or connected to the bracket 2, etc. Since there are many possible implementation methods, they will not be described one by one here.

[0040] After the improvement, the spring body 30 of the return torsion spring 3 can ensure that the retraction mechanism has a good retraction force in different use stages (i.e., periods of different degrees of wear of the brake pad), and the return torsion spring 3 will not be deformed too much as the retraction stroke increases with the wear of the brake pad, resulting in stress concentration, plastic deformation, or even fatigue fracture, thereby greatly improving the stability and reliability of the retraction mechanism.

[0041] Moreover, by using wire springs instead of leaf springs, the torsional deformation of the wire springs can be adjusted by the number of torsion turns, and the adjustment range is large. The structural design is not limited by space, which can solve the problem that the leaf spring has a small retraction force and an unsatisfactory drag effect in the early stage (small wear of the brake pad), and the leaf spring undergoes plastic deformation due to a large retraction stroke and the retraction force becomes small or stress concentration occurs, resulting in fatigue fracture.

[0042] In addition to the above-mentioned brake pad automatic retraction mechanism, the present invention also provides a braking device, including a brake disc and a brake pad 1 that contacts and rubs with the brake disc in a braking state, and is provided with the above-mentioned brake pad automatic retraction mechanism to keep the brake pad 1 away from the brake disc in a non-braking state.

[0043] The present invention also provides an automobile, including an engine, a chassis, a body and electrical equipment, wherein the chassis is provided with a braking device for braking the wheels, wherein the braking device is a braking device provided with the above-mentioned brake block automatic retraction mechanism. Regarding the braking device and other structures of the automobile, please refer to the prior art and will not be described in detail herein.

[0044] The above is a detailed introduction to the brake block automatic retraction mechanism, brake device and automobile provided by the present invention. Specific examples are used in this article to illustrate the principle and implementation method of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A brake block automatic retraction mechanism, comprising a brake block and a bracket, wherein a return component for generating a return force to return the brake block to a direction away from a brake disc is provided between the two ends of the brake block and the bracket, characterized in that: The return component is a return torsion spring, which includes a spring body, a first spring arm and a second spring arm; the spring body is located outside the brake block, one end of the first spring arm is connected to the spring body as a whole, the other end is provided with a clamping joint formed by bending, and is connected to the torsion spring connecting part of the brake block through the clamping joint; one end of the second spring arm is connected to the spring body as a whole, the other end is provided with a spring tongue formed by bending, and is supported on the spring tongue contact surface of the bracket through the spring tongue; The clamping joint of the first spring arm includes a "U"-shaped bending portion with an opening toward the spring body and a self-locking hook formed by reverse bending of the free end of the "U"-shaped bending portion; a positioning hole and a limiting groove are provided on the torsion spring connecting portion of the brake block, and the limiting groove is located on the outside of the torsion spring connecting portion, and its length direction is parallel to the axial direction of the positioning hole; the self-locking hook is pressed into the positioning hole from the inner side of the torsion spring connecting portion and clamped inside the positioning hole, one side of the "U"-shaped bending portion is located in the positioning hole, the other side is located in the limiting groove, and the bottom is located on the inner side of the torsion spring connecting portion.

2. The brake pad automatic retraction mechanism according to claim 1, characterized in that: The inner diameter of the positioning hole is smaller than the width of the self-locking hook.

3. The brake pad automatic retraction mechanism according to claim 1, characterized in that: A slot or a platform abutting against the end of the self-locking hook is provided in the positioning hole, and / or a slot corresponding to the spring tongue is provided on the contact surface of the spring tongue.

4. The brake pad automatic retraction mechanism according to claim 1, characterized in that: The spring tongue of the second spring arm includes a first bending portion formed by bending in a direction close to the spring tongue contact surface and a second bending portion formed by bending in the opposite direction, and the spring tongue contacts the spring tongue contact surface through the bending portion of the second bending portion.

5. The brake pad automatic retraction mechanism according to claim 1, characterized in that: The return torsion springs at both ends of the brake block are symmetrically arranged, the central axis of the spring body is parallel to the central symmetry plane of the brake block, and the first spring arm is perpendicular to the braking surface of the brake block.

6. The brake pad automatic retraction mechanism according to claim 1, characterized in that: The included angle between the first spring arm and the second spring arm is an obtuse angle.

7. The brake pad automatic retraction mechanism according to claim 1, characterized in that: The return torsion spring is formed by bending a stainless steel wire, and the diameter of the stainless steel wire is 0.8 mm to 2.0 mm.

8. A braking device, comprising a brake disc and a brake pad that contacts and rubs against the brake disc in a braking state, characterized in that: An automatic brake pad retraction mechanism according to any one of claims 1 to 7 is provided to move the brake pad away from the brake disc in a non-braking state.

9. An automobile, comprising an engine, a chassis, a body and electrical equipment, wherein the chassis is provided with a braking device for braking the wheels, characterized in that: The braking device is the braking device described in claim 8 above.

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