Friction plate active return mechanism

Abstract

The utility model discloses a friction plate active return mechanism which comprises a pair of fixed calipers, and friction plates are symmetrically installed on the two sides of an inner cavity of the fixed calipers. Pistons are arranged on the backs of the two friction plates of the fixed calipers respectively and used for pushing the friction plates to clamp a brake disc in a butt-clamping mode. The fixing calipers are provided with return elastic pieces on the backs of the two friction plates respectively, and each return elastic piece comprises a spring, a pin rod and a pressure spring seat; one end of the pin rod movably penetrates through the back plate of the friction plate and is provided with a flat head; the other end of the pin rod is connected with the pressure spring seat; the spring sleeves the outer side of the pin rod and is positioned between the back plate and the pressure spring seat; when the flat head abuts against the back plate, the spring is in a compressed state. Zero-delay active separation of the friction plate and the brake disc is achieved, and separation failure caused by eccentric wear or clamping stagnation of the friction plate in a traditional structure is avoided.

Description

Technical Field

[0001] This utility model relates to the field of automotive disc brake technology, specifically to a friction pad active return mechanism. Background Technology

[0002] When a car is in motion, after the driver presses and releases the brake pedal, the brake hydraulic pressure increases. However, the brake caliper piston does not fully return to its original position during the return process, resulting in some contact between the brake pads and the brake disc, causing friction and generating friction torque. This results in residual braking resistance torque on the brake disc during subsequent driving, forming drag torque, also known as residual torque. Reducing the overall braking drag torque is one of the important measures to save fuel and reduce fuel consumption.

[0003] Existing technology has the following problems: During each braking action, the friction pads clamp the brake disc under the action of the piston, generating braking force to decelerate or stop the vehicle. When braking ends, the piston returns to its original position first, and the friction pads are then thrown away from the brake disc by its rotation, thus returning to their original position. This passive return of the friction pads accelerates the wear of the friction surfaces of the friction lining and brake disc, causing uneven wear of the friction pads, reducing the overall braking torque, and causing large fluctuations in braking torque. This reduces the lifespan of the friction pads, and structural factors may lead to uneven wear. Uneven wear of the friction pads easily causes unstable braking torque, decreased braking performance, and brake noise and other malfunctions. Excessive wear of the brake disc increases the probability of brake shudder, and this frictional wear generates running resistance when the vehicle is not braking, thereby increasing fuel consumption. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the prior art by providing an active return mechanism for friction plates. A spring-pin linkage return mechanism is introduced, which directly applies axial return force to the friction plate through the elastic deformation of the spring, achieving zero-delay active separation of the friction plate from the brake disc. The limiting fit design between the flat head and the back plate ensures effective transmission of the return force, avoiding separation failures caused by uneven wear or jamming of the friction plate in traditional structures.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A friction pad active return mechanism includes a fixed clamp with friction pads symmetrically mounted on both sides of its inner cavity; the fixed clamp has pistons on the back of each of the two friction pads for pushing the friction pads to clamp and secure a brake disc; the fixed clamp has return elastic elements on the back of each of the two friction pads, each return elastic element including a spring, a pin, and a compression spring seat; one end of the pin movably passes through the back plate of the friction pad and has a flat head; the other end of the pin is connected to the compression spring seat; the spring is sleeved on the outside of the pin and located between the back plate and the compression spring seat; when the flat head abuts against the back plate, the spring is in a compressed state.

[0007] Furthermore, the spring is a cylindrical helical compression spring, made of 12Cr17Ni7 stainless steel wire, and manufactured through an aging hardening process at 300-400℃.

[0008] Furthermore, the pin and the compression spring seat are fixed by a snap-fit ​​connection.

[0009] Furthermore, the fixing clamp is provided with a mounting cavity, the return elastic element is disposed in the mounting cavity, and the pin moves axially under the guidance of the mounting cavity and is perpendicular to the friction plate.

[0010] Furthermore, the initial compression force of the spring is greater than the sliding resistance of the friction plate. When the friction plate is fully worn and clamps the brake disc, its compression force is less than the sliding resistance of the piston.

[0011] Furthermore, the spring satisfies the following parameter relationship: in the initial state, the spring return force F1 ≥ 20N, and when the friction plate is fully worn and clamps the brake disc, the spring return force F2 ≤ 60N.

[0012] Furthermore, the compression of the spring is configured such that the initial compression is ≥3mm; and the compression is ≤8mm when the friction plate is fully worn and clamps the brake disc.

[0013] Furthermore, the fixing caliper is provided with two return elastic elements on the back of each friction pad, and the two return elastic elements are symmetrically distributed at the upper and lower ends of the middle part of the back plate; the fixing caliper is provided with two pistons on the back of each friction pad, and the two pistons are symmetrically distributed at the left and right ends of the middle part of the back plate.

[0014] Furthermore, the fixing caliper is provided with a guide pin, and the friction plate is slidably connected to the guide pin.

[0015] A vehicle braking system includes the aforementioned friction pad active return mechanism.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] A spring-pin linkage return mechanism is introduced, which directly applies axial return force to the friction plate through the elastic deformation of the spring, realizing zero-delay active separation of the friction plate and the brake disc; the limiting fit design of the flat head and the back plate ensures the effective transmission of the return force and avoids separation failure caused by friction plate wear or jamming in traditional structures.

[0018] The return elastic element is independently set on the back of each friction plate, forming a parallel drive-return system with the piston. The modular design allows it to be integrated into dual-cylinder, three-cylinder and multi-cylinder calipers without changing the original hydraulic pipeline layout. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the front cross-sectional structure of the active return mechanism in one embodiment of this application;

[0021] Figure 2 This is a three-dimensional cross-sectional structural diagram of the active return mechanism in one embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the active return mechanism after the fixed clamp is hidden in one embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the active return mechanism after the fixed clamp is hidden in one embodiment of this application;

[0024] In the diagram: 1. Fixed caliper; 2. Friction plate; 3. Piston; 4. Spring; 5. Pin; 6. Compression spring seat; 7. Flat head; 8. Guide pin. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Existing technology has the following problems: During each braking action, the friction pads clamp the brake disc under the action of the piston, generating braking force to decelerate or stop the vehicle. When braking ends, the piston returns to its original position first, and the friction pads are then thrown away from the brake disc by its rotation, thus returning to their original position. This passive return of the friction pads accelerates the wear of the friction surfaces of the friction lining and brake disc, causing uneven wear of the friction pads, reducing the overall braking torque, and causing large fluctuations in braking torque. This reduces the lifespan of the friction pads, and structural factors may lead to uneven wear. Uneven wear of the friction pads easily causes unstable braking torque, decreased braking performance, and brake noise and other malfunctions. Excessive wear of the brake disc increases the probability of brake shudder, and this frictional wear generates running resistance when the vehicle is not braking, thereby increasing fuel consumption.

[0030] The embodiments of this application address the above-mentioned technical problems, such as... Figures 1 to 4As shown, a friction plate active return mechanism is provided, including a fixed clamp 1, on which friction plates 2 are symmetrically installed on both sides of its inner cavity; the fixed clamp 1 has pistons 3 on the back of the two friction plates 2 respectively, for pushing the friction plates 2 to clamp and lock the brake disc; the fixed clamp 1 has return elastic elements on the back of the two friction plates 2 respectively, the return elastic elements include springs 4, pins 5 and compression spring seats 6; one end of the pin 5 movably passes through the back plate of the friction plate 2 and has a flat head 7; the other end of the pin 5 is connected to the compression spring seat 6; the spring 4 is sleeved on the outside of the pin 5 and is located between the back plate and the compression spring seat 6; when the flat head 7 abuts against the back plate, the spring 4 is in a compressed state.

[0031] In the above embodiments, when the drive device is started, the piston 3 is driven by hydraulic or mechanical force, pushing the friction pads 2 on both sides to move synchronously towards the brake disc. During the movement of the friction pads 2, their back plates drive the pin 5 to move axially, compressing the spring 4 sleeved on the outside of the pin 5, so that the spring 4 stores elastic potential energy. At this time, the flat head 7 of the pin 5 remains in contact with the friction pad back plate, ensuring that the spring 4 is in a pre-compressed energy-storing state.

[0032] After the friction pad 2 presses against the brake disc, the compression of the spring 4 reaches its maximum value. Its elastic reaction force is balanced with the pin 5 through the spring seat 6, maintaining the clamping force of the friction pad 2 on the brake disc. At the same time, the limiting structure of the flat head 7 prevents the pin 5 from disengaging from the back plate.

[0033] When the drive unit is depressurized or retracted, piston 3 resets first. At this time, spring 4 releases its stored elastic potential energy, which drives pin 5 to move in the opposite direction through spring seat 6. The flat head 7 of pin 5 forms a rigid traction with the friction plate back plate, causing friction plate 2 to simultaneously disengage from the brake disc until spring 4 returns to its initial pre-compression state, completing the active return of friction plate 2.

[0034] Traditional fixed calipers rely on the centrifugal force of the rotating brake disc or the weight of the friction pads for passive separation, which suffers from problems such as delayed return and incomplete separation. This embodiment introduces a spring-pin linkage return mechanism, which directly applies axial return force to the friction pads 2 through the elastic deformation of the spring 4, achieving zero-delay active separation between the friction pads 2 and the brake disc. The limiting fit design between the flat head 7 and the back plate ensures effective transmission of the return force, avoiding separation failures caused by friction pad wear or jamming in traditional structures.

[0035] The return elastic element is independently installed on the back of each friction plate 2, forming a parallel drive-return system with the piston 3. The modular design allows it to be integrated into dual-cylinder, triple-cylinder, and multi-cylinder calipers without changing the original hydraulic pipeline layout.

[0036] In some embodiments, spring 4 is a cylindrical helical compression spring, made of 12Cr17Ni7 stainless steel wire and manufactured by an aging hardening process at 300-400℃.

[0037] By using 12Cr17Ni7 austenitic stainless steel wire to wind the spring, the spring acquires corrosion resistance and high-temperature resistance. After the spring is formed, it undergoes aging hardening treatment in a vacuum environment at 300-400℃, which strengthens the matrix and eliminates residual stress generated by the cold winding process, thus making the working stress distribution of the spring more uniform.

[0038] In some embodiments, the pin 5 and the compression spring seat 6 are connected by threads.

[0039] Specifically, one end of the pin 5 has an external thread, and the compression spring seat 6 has a matching internal thread. Tightening the threads achieves a fixed connection between the pin 5 and the compression spring seat 6. This threaded connection method offers high strength, capable of withstanding large axial and circumferential loads, ensuring the stable operation of the return mechanism.

[0040] In some embodiments, the fixing caliper 1 is provided with a mounting cavity, a return elastic element is provided in the mounting cavity, and the pin 5 moves axially under the guidance of the mounting cavity and is perpendicular to the friction plate 2.

[0041] The mounting cavity of the fixed clamp 1 provides precise mounting space for the return elastic element. Part of its inner wall matches the outer diameter of the pin 5, forming a sliding guide structure to ensure that the pin 5 does not deviate or jam during movement. Under the guidance of the mounting cavity, the pin 5 moves axially, and the direction of movement is always perpendicular to the back plate of the friction plate 2, ensuring that the transmission path of the return force is consistent with the movement direction of the friction plate 2, avoiding force loss or uneven wear of the friction plate due to angular deviation.

[0042] In some embodiments, the initial compression force of the spring 4 is greater than the sliding resistance of the friction plate 2. When the friction plate 2 is fully worn and clamps the brake disc, its compression force is less than the sliding resistance of the piston 3.

[0043] The initial compression force of spring 4 is greater than the sliding resistance of friction plate 2, ensuring that when the brake is released, spring 4 can overcome the friction between friction plate 2 and guide groove or caliper inner wall, drive friction plate 2 to return to its original position quickly, and realize reliable separation of friction plate 2 from brake disc.

[0044] When the friction pad 2 is fully worn and clamps the brake disc, the compressive force of the spring 4 is less than the sliding resistance of the piston 3. This ensures that even under extreme conditions, the piston 3 can still overcome the return force of the spring 4 and push the friction pad 2 to press against the brake disc, thus ensuring that braking performance is not affected.

[0045] For example, the return force of spring 4 is limited to the following: in the initial state, the return force F1 of spring 4 is ≥20N, and when the friction plate 2 is fully worn and clamps the brake disc, the return force F2 of spring 4 is ≤60N.

[0046] For example, the compression of spring 4 is configured such that the initial compression is ≥3mm; and the compression is ≤8mm when the friction plate 2 is fully worn and clamps the brake disc.

[0047] In some embodiments, the fixing caliper 1 is provided with two return elastic elements on the back of each friction pad 2, and the two return elastic elements are symmetrically distributed at the upper and lower ends of the middle part of the back plate; the fixing caliper 1 is provided with two pistons 3 on the back of each friction pad 2, and the two pistons 3 are symmetrically distributed at the left and right ends of the middle part of the back plate.

[0048] Two return elastic elements are symmetrically distributed at the upper and lower ends of the middle of the back plate of friction pad 2, ensuring that the return force is evenly distributed in the vertical direction of friction pad 2, and avoiding friction pad tilting or local dragging wear caused by single-point return force. Two pistons 3 are symmetrically distributed at the left and right ends of the middle of the back plate of friction pad 2, ensuring that the braking force is evenly distributed in the horizontal direction of friction pad 2, and avoiding friction pad uneven wear or brake disc deformation caused by single-point braking force.

[0049] In some embodiments, the fixed caliper 1 is provided with a guide pin 8, and the friction plate 2 is slidably connected to the guide pin 8.

[0050] The guide pin 8 is fixed in the inner cavity of the fixed caliper 1, and its axis is consistent with the movement direction of the friction plate 2, providing rigid guide support for the friction plate 2. The friction plate 2 is provided with a sliding hole that matches the guide pin 8. Through the cooperation between the sliding hole and the guide pin 8, it is ensured that the friction plate 2 moves axially, and the movement direction is always perpendicular to the brake disc.

[0051] A second aspect of this application provides a vehicle braking system, including the aforementioned friction pad active return mechanism.

[0052] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A friction plate active return mechanism, comprising a fixing caliper (1), wherein friction plates (2) are symmetrically installed on both sides of its inner cavity; the fixing caliper (1) is provided with pistons (3) on the back of the two friction plates (2) respectively, for pushing the friction plates (2) to clamp and clamp the brake disc; Its features are, The fixing caliper (1) has return elastic elements on the back of the two friction plates (2) respectively. The return elastic elements include springs (4), pins (5) and compression spring seats (6). One end of the pin (5) movably passes through the back plate of the friction plate (2) and has a flat head (7). The other end of the pin (5) is connected to the compression spring seat (6). The spring (4) is sleeved on the outside of the pin (5) and is located between the back plate and the compression spring seat (6). When the flat head (7) abuts against the back plate, the spring (4) is in a compressed state.

2. The friction plate active return mechanism according to claim 1, characterized in that, The spring (4) is a cylindrical helical compression spring, made of 12Cr17Ni7 stainless steel wire and manufactured by an aging hardening process at 300-400℃.

3. The friction plate active return mechanism according to claim 1, characterized in that, The pin (5) and the compression spring seat (6) are fixed by a snap-fit ​​connection.

4. The friction plate active return mechanism according to claim 1, characterized in that, The fixing caliper (1) is provided with a mounting cavity, the return elastic element is provided in the mounting cavity, and the pin (5) moves axially under the guidance of the mounting cavity and is perpendicular to the friction plate (2).

5. The friction plate active return mechanism according to claim 1, characterized in that, The initial compression force of the spring (4) is greater than the sliding resistance of the friction plate (2); when the friction plate (2) is fully worn and clamps the brake disc, the compression force of the spring (4) is less than the sliding resistance of the piston (3).

6. The friction plate active return mechanism according to claim 5, characterized in that, The spring (4) satisfies the following parametric relationship: In the initial state, the return force F1 of the spring (4) is ≥20N; when the friction plate (2) is fully worn and clamps the brake disc, the return force F2 of the spring (4) is ≤60N.

7. The friction plate active return mechanism according to claim 5, characterized in that, The compression of the spring (4) is configured such that the initial compression is ≥3mm; and the compression is ≤8mm when the friction plate (2) is fully worn and clamps the brake disc.

8. The friction plate active return mechanism according to claim 1, characterized in that, The fixing caliper (1) is provided with two return elastic elements on the back of each friction plate (2), and the two return elastic elements are symmetrically distributed at the upper and lower ends of the middle part of the back plate. The fixing caliper (1) is provided with two pistons (3) on the back of each friction plate (2), and the two pistons (3) are symmetrically distributed at the left and right ends of the middle part of the back plate.

9. The friction plate active return mechanism according to claim 1, characterized in that, The fixed clamp (1) is provided with a guide pin (8), and the friction plate (2) is slidably connected to the guide pin (8).

10. A vehicle braking system, characterized in that, Includes the friction plate active return mechanism as described in any one of claims 1-9.

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