Main adjustment structure of clearance self-adjusting mechanism in disc brake

Abstract

The present invention provides a main adjustment structure of a clearance self-adjusting mechanism in a disc brake, and belongs to the technical field of automobile accessories. It solves the problem of insufficient working stability. It includes a main adjustment shaft assembly, a return spring, and an adjustment component sleeved on the main adjustment shaft assembly. An abutment seat is provided on the lower side of the adjustment component, and the two ends of the return spring act on the abutment seat and the brake mechanism in the disc brake respectively. Under the action of the return spring, the adjustment component can contact the main adjustment shaft assembly and realize circumferential transmission through friction. The main adjustment shaft assembly is also sleeved with an elastic coupling. The inner side wall of the coupling is always in contact with the main adjustment shaft assembly under the action of its own elastic force to form a friction force that can drive the two along the circumferential direction. The coupling is located on the inner side of the abutment seat so that the main adjustment shaft assembly can drive the adjustment component to rotate through the coupling. It has the advantages of high working stability, simple and reasonable structure, etc.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile accessories, and relates to a disc brake, in particular to a main adjustment structure of a clearance self-adjusting mechanism in a disc brake. Background Art

[0002] The clearance self-adjusting mechanism is a key module in the disc brake. It is used to automatically adjust the excessive clearance caused by the wear of the brake components so that the brake clearance of the disc brake can be maintained within the specified range. The clearance self-adjusting mechanism mainly includes a main adjustment mechanism, two push rods arranged on both sides of the main adjustment mechanism, and screw sleeves respectively connected to the push rods by threads. The main adjustment mechanism includes a main adjustment shaft, a main adjustment gear arranged on the main adjustment shaft, a pressure plate and a return spring. The two push rods are respectively fixed with driven gears meshing with the main adjustment gear. During braking, the input load acts on the pressure plate, so that the pressure plate is pressed against the brake disc along with the push rod and the screw sleeve, and the return spring is compressed. At the same time, the main adjustment shaft is driven by the corresponding components of the disc brake to drive the main adjustment gear to rotate. The main adjustment gear drives the two driven gears to rotate at the same time, and then the two push rods are rotated to drive the two screw sleeves to push out along the thread to achieve automatic adjustment of the brake clearance. After the braking is completed, the input load disappears, and the pressure plate drives the push rod and the screw to reset under the action of the return spring. At the same time, since the main adjustment shaft will reverse at the end of the braking, in order to avoid excessive adjustment of the braking clearance, a one-way device is usually set between the main adjustment shaft and the main shaft gear to achieve one-way rotation, thereby ensuring that the main adjustment gear can remain stationary when the main adjustment shaft reverses. In addition, during the adjustment of the braking clearance, as the screw sleeve continues to close to the brake disc, the rotational resistance acting on the main adjustment gear will become larger and larger. In order to avoid damage to the force-bearing components on the main adjustment mechanism, an overload protection device is also required for protection.

[0003] To this end, the applicant has proposed a main adjustment mechanism of a disc brake clearance self-adjusting device with patent application number 201921885921.5, which includes a main adjustment shaft, an elastic element for resetting the braking mechanism in the disc brake, and a main adjustment component that is sleeved on the main adjustment shaft and can rotate, a transmission part is fixed on the main adjustment shaft, the lower end of the main adjustment component is in contact with the upper end of the transmission part and the two can achieve transmission through friction, an abutment part is provided on the outer sleeve of the main adjustment component, an annular surface is provided on the main adjustment component, a boss is provided in the abutment part, the elastic force of the elastic element acts on the abutment part, the boss and the annular surface abut against each other under the action of the elastic element and the main adjustment component and the transmission part are always in contact. During braking, the corresponding mechanism in the disc brake drives the main adjustment shaft to rotate, and the main adjustment shaft drives the transmission member to rotate. The elastic force of the elastic element acts on the abutment member to make the boss abut against the annular surface, so that friction can be generated between the main adjustment component and the transmission member, and a circumferential linkage is formed with the help of the friction force, and then the main adjustment component drives other components in the clearance self-adjusting device to automatically adjust the braking clearance; in the process of braking clearance adjustment, the rotational resistance of other components of the clearance self-adjusting device acting on the main adjustment component gradually increases, and slippage occurs between the transmission member and the main adjustment component, causing the load to be unloaded, thereby protecting other force-bearing components in the main adjustment mechanism from damage, thereby achieving overload protection.

[0004] The elastic element will be compressed every time the brake is applied, and the disc brake will generate high temperature due to braking. The combination of the two makes it easier for the elastic force of the elastic element to weaken. The friction between the transmission part and the main adjustment component depends on the force applied by the elastic element to the main adjustment component. Therefore, when the elasticity of the elastic element is weakened, the friction between the transmission part and the main adjustment component will be weakened, which will reduce the transmission stability between the two during braking, thereby reducing the working stability of the main adjustment mechanism. In order to solve the problem of reduced stability caused by the weakening of the elasticity of the elastic element, technicians in this field can easily think of using elastic elements that are more resistant to high temperatures and made of better materials. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems existing in the prior art and propose a main adjustment structure of the clearance self-adjusting mechanism in the disc brake to solve the problem of insufficient working stability.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The main adjustment structure of the clearance self-adjusting mechanism in the disc brake includes a main adjustment shaft assembly, a return spring and an adjustment component sleeved on the main adjustment shaft assembly. A support seat is provided on the lower side of the adjustment component and the two ends of the return spring act on the support seat and the brake mechanism in the disc brake respectively. The adjustment component can contact the main adjustment shaft assembly under the action of the return spring and realize circumferential transmission through friction. It is characterized in that an elastic connecting piece is also sleeved on the outside of the main adjustment shaft assembly. The inner side wall of the connecting piece is always in contact with the main adjustment shaft assembly under the action of its own elastic force to form a friction force that can cause the two to transmit circumferentially. The connecting piece is located on the inner side of the support seat so that the main adjustment shaft assembly can drive the adjusting component to rotate through the connecting piece.

[0008] During braking, the corresponding mechanism in the disc brake drives the main adjustment shaft assembly to rotate, and the main adjustment shaft assembly drives the adjustment component to rotate through friction, and then the adjustment component drives other components in the clearance self-adjusting mechanism to automatically adjust the brake clearance. In the process of the main adjustment shaft assembly driving the adjustment component to rotate, two frictions are formed, one is formed between the main adjustment shaft assembly and the adjustment component through the return spring, and the other is between the abutment seat of the main adjustment shaft assembly and the connecting part. When the rotational resistance of other components in the clearance self-adjusting mechanism acting on the adjustment component gradually increases during the brake clearance adjustment process, the above two frictions can cause slippage, so that the load is unloaded, and the overload protection of each load-bearing component in the main adjustment structure is realized.

[0009] The main adjustment structure is provided with an elastic coupling member inside the adjustment component. In addition to the friction generated by the return spring directly between the main adjustment shaft assembly and the adjustment component, there is another friction generated by the coupling member and the main adjustment shaft assembly. The elastic force of the coupling member does not consume any additional energy except for acting on the main adjustment shaft assembly. Therefore, even when the elastic force of the return spring is weakened, resulting in the friction torque generated by it becoming smaller or even disappearing, the friction between the coupling member and the main adjustment shaft assembly can still ensure the normal transmission of power, that is, the main adjustment shaft assembly drives the adjustment component to rotate through the coupling member, thereby improving the working stability. Moreover, the coupling member generates a force in the radial direction, while the return spring generates a force in the axial direction. Therefore, adding a coupling member will not consume the force of the return spring, making the structure more reasonable and reliable. The conventional function of the abutment seat is to bear the elastic force of the return spring to ensure that the adjustment component can always be in contact with the main adjustment shaft assembly to form friction rather than to transmit rotational force. Therefore, it is not easy for technical personnel in this field to think of providing a connecting part on the inner side of the abutment seat so that when the elastic force of the return spring is weakened, the main adjustment shaft assembly can realize the rotation of the adjustment component through the cooperation of the connecting part and the abutment seat.

[0010] In the main adjustment structure of the clearance self-adjusting mechanism in the above-mentioned disc brake, the connecting piece is made of metal material and the connecting piece and the abutting seat are in interference fit.

[0011] The connecting piece is made of metal material with relatively high hardness, and the connection between the connecting piece and the abutment seat becomes more secure through interference fit, so that the friction between the main adjustment shaft assembly and the connecting piece can stably drive the adjustment component to rotate synchronously, further improving the working stability.

[0012] In the main adjustment structure of the clearance self-adjusting mechanism in the above-mentioned disc brake, the connecting member and the main adjustment shaft assembly are in arc surface contact.

[0013] The connecting piece and the main adjustment shaft assembly are in arc contact, which increases the contact area, so that a more stable friction torque can be formed between the two when the disc brake is braking, further improving the working stability of the main adjustment structure.

[0014] In the main adjustment structure of the clearance self-adjusting mechanism of the above-mentioned disc brake, the connecting part is U-shaped, and the connecting part includes a sheet body one and two sheet bodies two respectively connected to the two sides of the sheet body one, the two sheet bodies two are clamped on the outside of the main adjustment shaft assembly, and the connection between the two sheet bodies two and the sheet body one and the ends of the two sheet bodies two are all against the inner side wall of the abutment seat.

[0015] The metal material is used to form a U-shape, so that the coupling piece is elastic. When the coupling piece is clamped outside the main adjustment shaft assembly, the elastic force of the coupling piece naturally acts inward on the main adjustment shaft assembly to generate friction during braking, thereby ensuring the working stability of the main adjustment structure. The connection between the two pieces of body 2 and the piece of body 1 and the ends of the two pieces of body 2 are against the inner side wall of the abutment seat, so that the coupling piece can form a very stable match with the adjustment assembly, so that when the rotation resistance of the adjustment assembly gradually increases, the coupling piece can smoothly slip with the main adjustment shaft to protect the various force-bearing components in the main adjustment structure.

[0016] In the main adjustment structure of the clearance self-adjusting mechanism of the above-mentioned disc brake, both plates have an outward convex arc segment, the main adjustment shaft assembly includes a main adjustment shaft and an overload friction ring circumferentially fixed on the main adjustment shaft, and the inner side wall of the outward convex arc segment contacts the outer side wall of the overload friction ring.

[0017] An outward convex arc segment is arranged on the second sheet body, and the inner side wall of the outward convex arc segment contacts the outer side wall of the overload friction ring, so that an arc surface contact can be formed between the connecting part and the main adjustment shaft assembly, thereby ensuring that a more stable friction torque can be formed to further improve the working stability of the main adjustment structure.

[0018] In the main adjustment structure of the clearance self-adjusting mechanism of the above-mentioned disc brake, the ends of the two plate bodies are bent outwards.

[0019] Bending both ends of the two pieces outward can increase the elastic coefficient of the coupling, ensure that a stable friction torque can be formed between the coupling and the main adjustment shaft assembly, and improve the working stability of the main adjustment structure. During assembly, the coupling is pressed into the inner side of the abutment seat, and the ends of the two pieces are bent outward so that the coupling and the abutment seat can form an interference fit.

[0020] In the main adjustment structure of the clearance self-adjusting mechanism in the above-mentioned disc brake, the connection between the two plate bodies 2 and 1 is arc-shaped, and the inner side wall of the abutment seat is a cylindrical surface.

[0021] Through the above arrangement, the contact area between the connecting member and the abutting seat can be increased, so that the cooperation between the two is more stable, and the working stability is further improved.

[0022] In the main adjustment structure of the clearance self-adjusting mechanism of the above-mentioned disc brake, as another technical solution, the connecting piece is in the shape of a plum blossom, and the inwardly protruding part of the connecting piece contacts the outer side of the main adjustment shaft assembly.

[0023] In the main adjustment structure of the clearance self-adjusting mechanism of the above-mentioned disc brake, the adjustment component also includes an overload protection sleeve sleeved outside the main adjustment shaft, the lower end surface of the overload protection sleeve is in abutment with the upper end surface of the overload friction ring, the abutment seat is cylindrical with an opening at the lower end and its lower end forms a stop edge outward for cooperating with a return spring, the connecting piece and the overload friction ring are both located in the opening of the abutment seat, and the upper end of the abutment seat is fixed to the overload protection sleeve along the circumferential direction.

[0024] The upper end of the abutment seat is fixed to the overload protection sleeve along the circumferential direction, which is equivalent to the abutment seat and the overload protection sleeve being combined as one along the circumferential direction. In this way, the main adjustment shaft assembly can drive the adjustment component to rotate through the friction between it and the connecting part, so that power can still be transmitted normally when the elastic force of the return spring is weakened.

[0025] In the main adjustment structure of the clearance self-adjusting mechanism of the above-mentioned disc brake, a step is provided on the outer side of the lower end of the overload protection sleeve, the upper end of the overload protection sleeve passes through the upper end of the abutment seat and the upper end of the abutment seat is buckled on the step, the abutment seat and the overload protection sleeve are fixed by an interference fit, or the upper end of the abutment seat is integrally fixed to the outside of the lower end of the overload protection sleeve.

[0026] Since the abutment seat and the overload protection sleeve are fixed by interference fit, the two are equivalent to forming a whole. Therefore, even when the elastic force of the return spring is weakened, the main adjustment shaft assembly can drive the overload protection sleeve to rotate through the friction formed between the main adjustment shaft assembly and the connecting member, thereby ensuring the stability of the work. Moreover, this structure makes the processing technology simpler and more convenient to produce. Of course, the overload protection sleeve and the abutment seat can also be directly processed into an integrated structure during processing.

[0027] Compared with the prior art, the main adjustment structure of the clearance self-adjusting mechanism in the disc brake has the following advantages:

[0028] 1. By fixing an elastic coupling piece on the inner side of the abutment seat of the adjusting assembly in the circumferential direction, two friction points can be formed when the main adjusting shaft assembly drives the adjusting assembly to rotate, and when the rotation resistance of the adjusting assembly gradually increases, the two friction points can slip, so that the load is unloaded, realizing overload protection for each force-bearing component in the main adjusting structure;

[0029] 2. The elastic force of the coupling does not consume any additional energy except for acting on the main adjustment shaft assembly. Therefore, even when the elastic force of the return spring weakens and the friction torque generated by it decreases or even disappears, the friction between the coupling and the main adjustment shaft assembly can still ensure the normal transmission of power, thereby improving the working stability.

[0030] 3. The connecting piece generates force in radial direction, while the return spring generates force in axial direction. Therefore, adding the connecting piece will not consume the force of the return spring, making the structure more reasonable and reliable.

[0031] 4. The connecting parts have a simple structure and are easy to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a cross-sectional schematic diagram of the first embodiment of the main adjustment structure of the clearance self-adjusting mechanism in the disc brake.

[0033] Figure 2 It is a schematic transverse cross-sectional view between the connecting member and the main adjustment shaft assembly in the first embodiment.

[0034] In the figure, 1, main adjustment shaft assembly; 1a, main adjustment shaft; 1a1, matching part; 1b, overload friction ring; 1c, clamping sleeve; 2, adjustment component; 2a, overload protection sleeve; 2a1, step; 2b, main adjustment gear; 2c, one-way device; 2d, abutment seat; 2d1, stop edge; 2d2, extension part; 3, return spring; 4, pressure plate; 5, connecting piece; 5a, sheet body one; 5b, sheet body two; 5b1, convex arc section; 6, anti-wear bushing; 7, spring seat. DETAILED DESCRIPTION

[0035] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0036] Embodiment 1

[0037] like Figure 1As shown, the main adjustment structure of the clearance self-adjusting mechanism in the disc brake includes a main adjustment shaft assembly 1, an adjustment component 2 sleeved on the main adjustment shaft assembly 1, and a return spring 3. A pressure plate 4 is provided on the upper end of the adjustment component 2, and one end of the return spring 3 abuts against the pressure plate 4. When the brake mechanism in the disc brake is working to brake, the pressure plate 4 will overcome the elastic force of the return spring 3 and press downward. Therefore, at the end of braking, the return spring 3 will push the pressure plate 4 upward to drive the brake mechanism to reset. A support seat 2d is provided on the lower side of the adjustment component 2, and the other end of the return spring 3 acts on the support seat 2d. Under the action of the return spring 3, the adjustment component 2 can contact the main adjustment shaft assembly 1 and realize circumferential transmission through friction.

[0038] like Figure 1 and Figure 2 As shown, the main adjustment shaft assembly 1 is also sleeved with a coupling 5, which is elastic. The inner wall of the coupling 5 is always in contact with the main adjustment shaft assembly 1 under its own elastic force to form a friction force that can drive the two in the circumferential direction. The coupling 5 is located inside the abutment seat 2d so that the main adjustment shaft assembly 1 can drive the adjustment component 2 to rotate through the coupling 5. The coupling 5 is U-shaped and made of metal material. The coupling 5 and the abutment seat 2d are fitted by interference. The coupling 5 is clamped outside the main adjustment shaft assembly 1 and the two are in arc contact. Specifically, the coupling 5 includes a sheet 1 5a and two sheets 2 5b respectively connected to the two sides of the sheet 1 5a, and the two sheets 2 5b are clamped outside the main adjustment shaft assembly 1. The main adjustment shaft assembly 1 includes a main adjustment shaft 1a and an overload friction ring 1b circumferentially fixed on the main adjustment shaft 1a (the two are specifically matched through a flat square shape). The lower end of the main adjustment shaft 1a is inserted into the bottom cover of the disc brake, and the upper end of the main adjustment shaft 1a has a matching portion 1a1, which is used to match with the corresponding mechanism in the disc brake to ensure that the main adjustment shaft 1a can rotate when the disc brake is braking. Both the two pieces 5b have an outer convex arc segment 5b1, and the inner side wall of the outer convex arc segment 5b1 contacts the outer side wall of the overload friction ring 1b to form an arc surface contact. The ends of the two pieces 5b are bent outward.

[0039] like Figure 1 and Figure 2As shown, the connection between the two pieces 5b and the piece 1 5a and the ends of the two pieces 5b are in abutment with the inner side wall of the abutting seat 2d. The connection between the two pieces 5b and the piece 1 5a is arc-shaped, and the inner side wall of the abutting seat 2d is a cylindrical surface, which can increase the contact area between the connecting member 5 and the abutting seat 2d. Specifically, the adjustment component 2 also includes an overload protection sleeve 2a mounted on the outside of the main adjustment shaft 1a, a main adjustment gear 2b mounted on the outside of the overload protection sleeve 2a, and a one-way device 2c arranged between the overload protection sleeve 2a and the main adjustment gear 2b. The lower end surface of the overload protection sleeve 2a is in contact with the overload friction ring 1b, the abutment seat 2d is cylindrical with an open lower end, and its lower end forms a stop edge 2d1 outwardly for cooperating with the return spring 3. The connecting piece 5 and the overload friction ring 1b are both located in the opening of the abutment seat 2d, and the upper end of the abutment seat 2d is fixed to the overload protection sleeve 2a along the circumferential direction.

[0040] Furthermore, if Figure 1 As shown, the overload protection sleeve 2a is sleeved outside the main adjustment shaft 1a and an anti-wear sleeve 6 is provided between the two. The main adjustment shaft assembly 1 also includes a compression sleeve 1c fixed near the lower end of the main adjustment shaft 1a. The lower end face of the overload friction ring 1b abuts against the compression sleeve 1c, and the lower end face of the overload protection sleeve 2a abuts against the upper end face of the overload friction ring 1b. A step 2a1 is provided on the outer side of the lower end of the overload protection sleeve 2a, and the lower end of the abutment seat 2d is open. The upper end of the overload protection sleeve 2a passes through the upper end of the abutment seat 2d and the upper end of the abutment seat 2d is buckled on the step 2a1. The abutment seat 2d is fixed to the overload protection sleeve 2a by interference fit. An assembly hole is provided through the center of the upper end of the abutment seat 2d, and an extension portion 2d2 is formed upward from the assembly hole. The extension portion 2d2 can lengthen the depth of the assembly hole to ensure that the abutment seat 2d can be fixed to the overload protection sleeve 2a by interference fit. A spring seat 7 is provided outside the abutting seat 2d. The spring seat 7 is specifically a thrust ball bearing. The spring seat 7 abuts against the retaining edge 2d1. The pressure plate 4 is sleeved outside the main adjusting gear 2b. One end of the return spring 3 abuts against the spring seat 7.

[0041] During braking, the corresponding mechanism in the disc brake pushes the mating portion 1a1 in the circumferential direction to rotate the main adjustment shaft assembly 1, and at the same time, the pressure plate 4 is compressed by the force against the elastic force of the return spring 3. The elastic force of the return spring 3 acts downward on the adjustment component 2, so that the overload protection sleeve 2a and the overload friction ring 1b are always in contact with each other to form a friction force, and at the same time, a friction force is also formed between the coupling 5 and the overload friction ring 1b. The main adjustment shaft assembly 1 thus drives the adjustment component 2 to rotate by friction, specifically, the overload protection sleeve 2a rotates by friction, and then drives the main adjustment gear 2b to rotate through the one-way device 2c to drive other components in the clearance self-adjusting mechanism to automatically adjust the brake clearance.

[0042] During the automatic adjustment of the brake clearance, the rotational resistance of the other components in the clearance self-adjusting device on the main adjustment gear 2b gradually increases. At this time, slippage occurs between the overload protection sleeve 2a and the overload friction ring 1b and between the overload friction ring 1b and the connecting piece 5, so that the load is unloaded to protect the various force-bearing components in the main adjustment structure, especially the one-way device 2c, from being damaged. After the braking is completed, the input load applied to the pressure plate 4 disappears, and the pressure plate 4 gradually returns to the initial position under the action of the return spring 3, and the corresponding mechanism in the disc brake reversely drives the main adjustment shaft assembly 1 to rotate. Although there is friction between the overload friction ring 1b and the overload protection sleeve 2a and between the overload friction ring 1b and the connecting piece 5, which makes the overload protection sleeve 2a rotate, the main adjustment gear 2b remains stationary due to the action of the one-way device 2c, so that the other components in the clearance self-adjusting mechanism remain stationary to ensure that the brake clearance will not be over-adjusted.

[0043] The main adjustment structure fixes an elastic coupling 5 on the inner side of the adjustment component 2 in the circumferential direction. In addition to the friction between the main adjustment shaft assembly 1 and the adjustment component 2 caused by the return spring 3, there is another friction formed between the coupling 5 and the main adjustment shaft assembly 1. The elastic force of the coupling 5 acts on the main adjustment shaft assembly 1 without any additional consumption. Therefore, even when the elastic force of the return spring 3 is weakened, resulting in a smaller or even disappearing friction torque generated by it, the friction between the coupling 5 and the main adjustment shaft assembly 1 can still ensure the normal transmission of power, thereby improving the working stability. Moreover, the coupling 5 generates a force in the radial direction, while the return spring 3 generates a force in the axial direction. Therefore, adding the coupling 5 will not consume the force of the return spring 3, making the structure more reasonable and reliable.

[0044] Embodiment 2

[0045] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the connecting member 5 is plum blossom-shaped and made of metal material, and the inwardly protruding portion of the connecting member 5 contacts the outer side of the main adjustment shaft assembly 1.

[0046] Embodiment 3

[0047] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: in this embodiment, the upper end of the abutment seat 2d is integrally fixed to the outer portion of the lower end of the overload protection sleeve 2a.

[0048] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A main adjustment structure of a self-adjusting mechanism in a disc brake, comprising a main adjustment shaft assembly (1), a return spring (3), and an adjustment component (2) sleeved on the main adjustment shaft assembly (1), wherein a support seat (2d) is provided on the lower side of the adjustment component (2), and two ends of the return spring (3) act on the support seat (2d) and the brake mechanism in the disc brake respectively, and the adjustment component (2) can contact the main adjustment shaft assembly (1) under the action of the return spring (3) and realize circumferential transmission by friction, characterized in that: The main adjustment shaft assembly (1) is also sleeved with an elastic coupling member (5). The inner wall of the coupling member (5) is always in contact with the main adjustment shaft assembly (1) under the action of its own elastic force, forming a friction force that can cause the two to transmit in a circumferential direction. The coupling member (5) is located on the inner side of the abutment seat (2d) so that the main adjustment shaft assembly (1) can drive the adjustment component (2) to rotate through the coupling member (5). The coupling member (5) is made of metal material and the coupling member (5) and the abutment seat (2d) are in interference fit. There is an arc surface contact between the coupling member (5) and the main adjustment shaft assembly (1). The coupling member (5) is U-shaped. The coupling member (5) comprises a sheet body (5a) and Two sheet bodies (5b) are respectively connected to both sides of sheet body one (5a), and the two sheet bodies (5b) are clamped on the outside of the main adjustment shaft assembly (1). The connection between the two sheet bodies (5b) and the sheet body one (5a) and the ends of the two sheet bodies (5b) are in contact with the inner side wall of the abutment seat (2d). The two sheet bodies (5b) have an outward convex arc section (5b1). The main adjustment shaft assembly (1) includes a main adjustment shaft (1a) and an overload friction ring (1b) circumferentially fixed on the main adjustment shaft (1a). The inner side wall of the outward convex arc section (5b1) is in contact with the outer side wall of the overload friction ring (1b), and the ends of the two sheet bodies (5b) are bent outward.

2. The main adjustment structure of the clearance self-adjusting mechanism in the disc brake according to claim 1, characterized in that: The connection points between the two sheet bodies 2 (5b) and the sheet body 1 (5a) are both arc-shaped, and the inner side wall of the abutment seat (2d) is a cylindrical surface.

3. The main adjustment structure of the clearance self-adjusting mechanism in the disc brake according to claim 2, characterized in that: The adjustment assembly (2) further comprises an overload protection sleeve (2a) sleeved outside the main adjustment shaft (1a); the lower end surface of the overload protection sleeve (2a) abuts against the upper end surface of the overload friction ring (1b); the abutment seat (2d) is cylindrical with an opening at the lower end and a stop edge (2d1) is formed outwardly at its lower end for cooperating with the return spring (3); the connecting piece (5) and the overload friction ring (1b) are both located in the opening of the abutment seat (2d); and the upper end of the abutment seat (2d) is fixed to the overload protection sleeve (2a) along the circumferential direction.

4. The main adjustment structure of the clearance self-adjusting mechanism in the disc brake according to claim 3, characterized in that: A step (2a1) is provided on the outer side of the lower end of the load protection sleeve (2a); the upper end of the overload protection sleeve (2a) passes through the upper end of the abutment seat (2d) and the upper end of the abutment seat (2d) is buckled on the step (2a1); the abutment seat (2d) and the overload protection sleeve (2a) are fixed by interference fit, or the upper end of the abutment seat (2d) is integrally fixed to the outside of the lower end of the overload protection sleeve (2a).

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