Piston return stroke adjusting mechanism

Abstract

The invention discloses a piston return stroke adjusting mechanism. Comprising a caliper body, a piston and a clearance adjusting gasket, the piston is arranged in a cylinder hole of the caliper body, the clearance adjusting gasket and the piston are coaxially arranged in the cylinder hole of the caliper body, a metal hook part at the front end of the clearance adjusting gasket is embedded in a groove in the bottom of the piston, and an elastic part at the rear end of the clearance adjusting gasket is clamped with the inner wall of the cylinder hole and is in slidable friction fit connection with the inner wall of the cylinder hole. According to the piston return stroke adjusting mechanism, the residual dragging torque is obviously reduced, and the piston return stroke adjusting mechanism has the effects that the adjusting gasket can be modularly replaced, different defined value return amounts are achieved, the endurance is improved, and the service life of a friction plate is prolonged.

Description

Technical Field

[0001] This invention relates to vehicle braking systems, and more particularly to an adjustment mechanism for the piston return stroke of a disc brake, relating to the field of brake system caliper technology. Background Technology

[0002] Reducing residual drag torque has become a common requirement for all types of calipers. Current designs rely solely on the elastic deformation of a rectangular seal to pull back the piston, resulting in significant variations in the amount of piston retraction. As the brake pads wear, the piston extends further forward, increasing the disc-pad clearance. Furthermore, aging of the seal reduces the piston's retraction, further decreasing the actual remaining clearance between the brake disc and friction pads. This leads to increased drag torque, higher fuel consumption, and accelerated abnormal disc-pad wear. While high-end solutions incorporate return springs or mechanisms, these introduce more parts, require more space, and incur higher costs. They also necessitate modifications to the caliper body, hindering platform-based design.

[0003] Therefore, the industry urgently needs a simple, low-cost, and stable piston return stroke adjustment mechanism to maintain a constant return amount throughout its entire life cycle. Summary of the Invention

[0004] This invention addresses the common defects of insufficient piston retraction and increased residual drag torque caused by aging of rectangular seals and wear of brake blocks. It proposes a single-piece, low-cost piston return stroke adjustment mechanism that can be embedded in the caliper cylinder bore and has a constant piston return amount, so that the return amount remains constant throughout the entire life cycle.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention includes a clamp body and a piston, the piston being installed in the cylinder bore of the clamp body, and also includes a clearance adjusting washer, the clearance adjusting washer and the piston being coaxially installed in the cylinder bore of the clamp body, the front end of the clearance adjusting washer being adjustablely fitted into the bottom of the piston, and the rear end being locked against the inner wall of the cylinder bore to form a slidable frictional fit connection.

[0006] The rear end of the gap adjusting washer is axially movable and fitted into the cylinder bore of the clamp body, and is slidably frictionally connected to the cylinder bore.

[0007] The front end face of the gap adjusting washer is fixedly provided with a hook, and the bottom surface of the piston is provided with a groove for cooperating with the hook. The hook at the front end of the gap adjusting washer is fitted into the groove at the bottom of the piston.

[0008] The front hook of the gap adjustment washer has an axial gap between it and the groove on the bottom surface of the piston, and the axial gap is adjustable to set the size of the return stroke.

[0009] The hook is provided in multiple parts, and the multiple hooks are evenly distributed circumferentially on the front end face of the gap adjusting washer.

[0010] The hook is L-shaped, and the groove is configured as an L-shaped groove structure.

[0011] The rear end of the gap adjusting washer is configured as a ring structure.

[0012] In the gap adjusting washer, the hook at the front end is made of metal, and the part that mates with the clamp body is made of elastic material.

[0013] It also includes a sealing ring. The piston and the cylinder bore of the clamp body are sealed together by the sealing ring. The return capacity of the sealing ring far exceeds the axial clearance between the front hook of the clearance adjusting washer and the groove on the bottom surface of the piston.

[0014] The clearance adjusting washer of this invention is coaxially placed inside the cylinder bore of the caliper body and located between the piston and the bottom surface of the cylinder bore. The front metal hook is fitted into the groove at the bottom of the piston, and the rear elastic section is locked against the inner wall of the cylinder bore. When the brake is released, after the piston is pulled back to its original position by the rectangular sealing ring, it is stopped by the rigid stop of the clearance adjusting washer's preset clearance X, so that the clearance between the piston side friction plate and the brake disc is constant, and the return amount is no longer affected by the aging or wear of the sealing ring, thereby precisely limiting the axial return amount of the piston to the set value.

[0015] The beneficial effects of this invention are: This invention reduces residual drag torque, is low-cost, lightweight, requires little assembly space, extends friction plate life, and reduces overall vehicle energy consumption.

[0016] This invention provides a piston return stroke adjustment mechanism that significantly reduces residual drag torque, features modularly replaceable adjustment washers, allows for different defined return values, and improves endurance and extends the life of the friction plates. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the gap adjustment washer of the present invention; Figure 3 This is a schematic diagram of the piston of the present invention.

[0018] In the figure: clamp body (1), piston (2), gap adjusting washer (3), sealing ring (4). Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1As shown, the mechanism includes a clamp body 1, a piston 2, and a clearance adjusting washer 3. The piston 2 is installed in the cylinder bore of the clamp body 1. The clearance adjusting washer 3 and the piston 2 are coaxially installed in the cylinder bore of the clamp body 1. The metal hook at the front end of the clearance adjusting washer 3 is fitted into the groove at the bottom of the piston 2, and the elastic part at the rear end is locked with the inner wall of the cylinder bore and forms a slidable frictional fit connection.

[0021] The clearance adjusting washer 3 uses the axial resistance of the friction fit to keep the piston 2 axially limited and form a rigid stop during retraction; when the friction plate wears, the piston 2 moves outward and may pull the clearance adjusting washer 3 outward.

[0022] The rear end of the clearance adjusting washer 3 is axially movable and fitted into the cylinder bore of the clamp body 1, and is slidably frictionally connected with the cylinder bore.

[0023] like Figure 2 As shown, a metal hook is fixedly provided on the front end face of the gap adjusting washer 3, such as... Figure 3 As shown, the bottom surface of piston 2 has a groove for engaging with the metal hook. The metal hook at the front end of the clearance adjusting washer 3 is fitted into the groove at the bottom of piston 2. The metal hook is L-shaped, and the groove is configured as an L-shaped groove structure.

[0024] Multiple metal hooks are provided, and these metal hooks are evenly distributed circumferentially on the front end face of the gap adjusting washer 3. At the same time, multiple grooves are provided on the bottom surface of the piston 2, which correspond to and cooperate with the multiple metal hooks.

[0025] There is an axial gap between the front metal hook of the gap adjusting washer 3 and the groove on the bottom surface of the piston 2, and the axial gap is adjustable to set the size of the return stroke.

[0026] The clearance adjusting washer 3 is not only coaxially mounted with the piston 2 in the cylinder bore of the clamp body 1, but also axially movable with the piston 2 in the cylinder bore of the clamp body 1. The clearance adjusting washer 3 can move axially together with the piston 2.

[0027] like Figure 2 As shown, the rear end of the gap adjusting washer 3 can be configured as a ring structure. In the gap adjusting washer 3, the hook portion at the front end is made of metal, while the remaining rear end and the clamping part are made of elastic material, including but not limited to rubber, and the metal material and elastic material are fixedly connected.

[0028] In the specific implementation, it also includes a sealing ring 4. The piston 2 and the cylinder bore of the clamp body 1 are sealed and connected by the sealing ring 4, which is a rectangular sealing ring.

[0029] The installation process for gap adjusting washer 3 is as follows: First, press the gap adjusting washer 3 into the cylinder hole of the clamp body 1, then assemble the sealing ring 4, and then install the piston 2 so that its bottom groove is axially aligned with the metal hook at the front end of the gap adjusting washer 3. After the two are engaged, rotate the piston 2 to complete the stop.

[0030] During the brake release phase, the return stroke of piston 2 is kept constant by the axial limit of clearance adjusting washer 3.

[0031] like Figure 1 , Figure 2 , Figure 3 As shown, this invention includes a gap adjusting washer whose front metal hook rotates and engages with the bottom groove of the piston, and whose rear elastic section engages with the cylinder bore of the clamp body, forming an axial limiting chain of "piston-waist-clamp body". A rectangular sealing ring is still maintained between the piston and the clamp body for sliding sealing, but the return amount is increased. The gap adjusting washer allows the piston to rotate synchronously without adding additional tightening. When the brake is released, the sealing ring pulls the piston back to its original position, and then the washer rigidly stops at a preset gap, ensuring a constant return amount and stable drag torque. The entire connection is completed solely by the gap adjusting washer, resulting in a compact structure and convenient assembly / disassembly.

[0032] As can be seen from the specific implementation, the present invention achieves a significant reduction in residual drag torque, has modularly replaceable adjustment washers, realizes different defined values ​​of return amount, improves endurance and extends the life of friction plates.

[0033] The above specific embodiments are used to explain and illustrate the present invention, but not to limit the present invention. Any modifications and changes made to the present invention within the spirit and scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A piston return stroke adjustment mechanism, comprising a clamp body (1) and a piston (2), wherein the piston (2) is mounted in the cylinder bore of the clamp body (1), characterized in that: It also includes a gap adjustment washer (3), which is coaxially mounted with the piston (2) in the cylinder bore of the clamp body (1). The front end of the gap adjustment washer (3) is adjustablely fitted into the bottom of the piston (2), and the rear end is locked with the inner wall of the cylinder bore to form a sliding friction fit connection.

2. The piston return stroke adjustment mechanism according to claim 1, characterized in that: The rear end of the gap adjusting washer (3) is axially movable and fitted into the cylinder bore of the clamp body (1), and is slidably frictionally connected with the cylinder bore.

3. The piston return stroke adjustment mechanism according to claim 1, characterized in that: The gap adjusting washer (3) has a hook fixedly provided on its front end face, and the bottom surface of the piston (2) has a groove for engaging with the hook. The hook at the front end of the gap adjusting washer (3) is fitted into the groove at the bottom of the piston (2).

4. The piston return stroke adjustment mechanism according to claim 1, characterized in that: The front end hook of the gap adjustment washer (3) has an axial gap between it and the groove on the bottom surface of the piston (2), and the axial gap is adjustable to set the size of the return stroke.

5. The piston return stroke adjustment mechanism according to claim 1, characterized in that: The hook is provided in multiple parts, and the multiple hooks are evenly distributed circumferentially on the front end face of the gap adjustment washer (3).

6. The piston return stroke adjustment mechanism according to claim 1, characterized in that: The hook is L-shaped, and the groove is configured as an L-shaped groove structure.

7. The piston return stroke adjustment mechanism according to claim 1, characterized in that: The rear end of the gap adjusting washer (3) is configured as a ring structure.

8. The piston return stroke adjustment mechanism according to claim 1, characterized in that: In the gap adjusting washer (3), the hook at the front end is made of metal, and the part that mates with the clamp body (1) is made of elastic material.

9. The piston return stroke adjustment mechanism according to claim 1, characterized in that: It also includes a sealing ring (4), whose return capability exceeds the axial gap between the front end hook of the gap adjusting washer (3) and the groove on the bottom surface of the piston (2).

Images