Disc brake

Abstract

The utility model provides a disc brake, and belongs to the technical field of brakes. The problem that the brake block on the outer side is prone to eccentric wear is solved. A groove is formed in the bottom of the caliper body, the inner side brake block and the outer side brake block are both located in the groove and oppositely arranged in the transverse direction, a transmission mechanism is arranged in the caliper body and can drive the inner side brake block to be close to the outer side brake block, and the side, back on to the inner side brake block, of the outer side brake block is attached to one side wall of the groove. A first matching part is arranged on the side, opposite to the inner side brake block, of the outer side brake block, a second matching part is arranged on the inner wall of the groove, and the first matching part and the second matching part form a concave-convex matching structure in the transverse direction so as to limit the outer side brake block to rotate relative to the caliper body. One end of the pin penetrates out of the caliper body and is fixedly connected with an abutting piece, and the abutting piece abuts against the outer wall of the caliper body so that the outer side brake block and the caliper body can be fixed in the transverse direction. The utility model has the advantages that the outside brake block is not easy to eccentrically wear and the structure is reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of brakes and relates to a disc brake. Background Art

[0002] Disc brakes are a common type of brake used on the wheels of passenger and freight vehicles. During braking, two brake pads are pressed against the brake disc from both sides under the action of the braking system, and eventually the rotating brake disc is locked to achieve the purpose of braking the vehicle. For example, a brake disclosed in patent application No. 201922220300.1 includes a caliper that can span the brake disc, two brake pad assemblies for cooperating with the brake disc for braking, and a bracket. The two brake pad assemblies are respectively located on the inner and outer sides of the brake disc. The brake pad assembly located on the inner side of the inner brake disc (also called the inner brake pad) is mounted on the bracket, and the brake pad assembly located on the outer side of the brake disc (also called the outer brake pad) is mounted on the caliper. A transmission mechanism is provided in the caliper, the inner brake pad is connected to the transmission mechanism, and the bracket is slidably connected to the caliper. Among them, in order to realize the positioning of the outer brake block on the caliper body, the outer brake block includes a back plate, a friction block is fixed on the front of the back plate, an elastic pressure strip is fixed on the top of the back plate, at least two positioning pins are fixed on the caliper body, and a positioning plane is provided on the back side of the back plate for positioning against the caliper body, and a mounting hole corresponding to the positioning pin is provided on the positioning plane. The positioning pin is inserted into the mounting hole and forms a clearance fit, and the elastic pressure strip acts on the back plate to make the top side surface of the mounting hole rest on the positioning pin; a positioning surface is provided on the caliper body, and a connecting hole is opened on the positioning surface. The positioning pin is inserted and fixed in the connecting hole. The positioning pin has a positioning end inserted into the mounting hole, and a mating portion that is clearance fit with the mounting hole is convexly provided on the outer surface of the positioning end, and the mating portion rests on the positioning surface.

[0003] During braking, the transmission mechanism receives the braking force and pushes the inner brake pad toward the brake disc. Since the brake disc's horizontal axial position is fixed and the transmission mechanism continuously receives the braking force, the brake disc generates a reaction force on the caliper, causing it to float. The caliper then drives the outer brake pad to come into contact with the brake disc, causing the inner and outer brake pads to simultaneously clamp the brake disc and gradually lock it. When the brake is released, the caliper and brake pads return to their original positions.

[0004] However, in practice, the return of the outer brake pad and the caliper body are not synchronized. Often, when the caliper body has returned to its position, the outer brake pad is still in a state of being pressed against the brake disc, and can only rely on the centrifugal force of the brake disc when rotating at high speed to push the outer brake pad back to its original position. This method can easily cause eccentric wear of the outer brake pad. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems existing in the prior art and to propose a disc brake, which solves the problem that the outer brake pad is prone to uneven wear.

[0006] The purpose of this utility model can be achieved through the following technical solutions:

[0007] A disc brake comprises a caliper body having a groove at the bottom and an inner brake pad and an outer brake pad both located in the groove and arranged opposite to each other laterally. A transmission mechanism is provided in the caliper body and the transmission mechanism can drive the inner brake pad toward the outer brake pad, and the side of the outer brake pad facing away from the inner brake pad is abutted against a side wall of the groove. It is characterized in that the outer brake pad has a matching portion 1 on the side facing away from the inner brake pad, and the inner wall of the groove is provided with a matching portion 2. The matching portion 1 and the matching portion 2 form a concave-convex matching structure laterally to limit the rotation of the outer brake pad relative to the caliper body. The outer brake pad is fixedly connected to a pin at a matching portion along the horizontal direction, and one end of the pin passes through the caliper body and is fixedly connected to a supporting member. The supporting member abuts against the outer wall of the caliper body to fix the outer brake pad and the caliper body along the horizontal direction.

[0008] When the side of the outer brake pad facing away from the inner brake pad is pressed against the side wall of the groove, a pin is fixed to the outer brake pad along the transverse direction. The pin passes through the caliper body and is fixedly connected to the abutment. The abutment is pressed against the outer wall of the caliper body, so that the outer brake pad and the caliper body are fixed together along the transverse direction. In this way, when the brake is released, the caliper body can actively return with the outer brake pad, thereby ensuring that the outer brake pad will no longer be pressed against the brake disc, so that the outer brake pad no longer relies on the centrifugal force when the brake disc rotates to return, thereby avoiding eccentric wear of the outer brake pad.

[0009] In addition, a matching portion 1 is provided on the side of the outer brake pad facing away from the inner brake pad, and a matching portion 2 is provided on the inner wall of the groove. The matching portion 1 and the matching portion 2 form a concave-convex matching structure along the horizontal direction to limit the rotation of the outer brake pad relative to the caliper body, and the pin is fixedly connected to a matching portion. In this way, the outer brake pad at a matching portion can be used to bear the braking torque, that is, the pin does not bear the braking torque. In this way, the pin only plays a role of cooperating with the abutment to fix the outer brake pad and the caliper body along the horizontal direction. This can ensure that the pin will not be deformed after long-term use due to bearing the braking torque, thereby ensuring the reliability of the structure.

[0010] In the above-mentioned disc brake, the mating part 1 is a boss, and the mating part 2 is a mating groove. The boss is located in the mating groove and the two have the same shape. The pin is fixedly connected to the side wall of the boss facing away from the inner brake pad. The caliper body has a through hole arranged in the transverse direction, and an opening at one end of the through hole passes through the bottom wall of the mating groove.

[0011] In the above-mentioned disc brake, as another technical solution, the first mating part is a mating groove, and the second mating part is a boss. The boss is located in the mating groove and the two have the same shape. The pin is fixedly connected to the bottom wall of the mating groove. The caliper body has a through hole arranged in the transverse direction, and an opening at one end of the through hole passes through the boss.

[0012] The concave-convex matching structure formed by the boss and the groove effectively prevents the outer brake pad from rotating relative to the inner brake pad. When the boss is located in the matching groove, the pin passes through the through hole. In this state, the side wall of the boss abuts against the wall of the matching groove to directly bear the braking torque.

[0013] In the above-mentioned disc brake, the transverse direction is the left-right direction, the boss is arranged in a rectangular shape along the front-back direction, the number of pins is at least two, each pin is distributed along the front-back direction, and the end of each pin is fixedly connected to a supporting member.

[0014] The boss is rectangular in shape along the front-to-back direction, and the matching groove has the same shape as the boss and is also rectangular in shape along the front-to-back direction. On this basis, by setting the number of pins to at least two and distributing the pins along the front-to-back direction, the outer brake pad can be more firmly fixed to the caliper body.

[0015] In the above-mentioned disc brake, the abutment member is a nut threadedly connected to the end of the pin.

[0016] After the pin passes through the caliper body, the nut is screwed onto the end of the pin until the nut rests against the outer wall of the caliper body, thereby fixing the outer brake pad to the caliper body in the transverse direction. When the brake is released, the caliper body will reset with the outer brake pad.

[0017] In the above-mentioned disc brake, an annular groove is provided on the outer side of the end of the pin, and the abutting member is a retaining ring clamped in the annular groove.

[0018] After the pin passes through the caliper body, the retaining ring is clamped in the annular groove and fixed to the end of the pin so that the outer brake pad and the caliper body are fixedly connected together in the transverse direction, so that when the brake is released, the caliper body will reset with the outer brake pad.

[0019] In the above-mentioned disc brake, the caliper body has an abutting plane, the other end opening of the through hole passes through the abutting plane, the abutting plane is perpendicular to the pin, and the abutting member abuts against the abutting plane.

[0020] The arrangement of the abutting plane enables a closer abutment to be formed between the abutting member and the caliper body, thereby ensuring a transverse fixing effect between the caliper body and the outer brake block.

[0021] In the above-mentioned disc brake, the outer brake pad includes a back plate and a friction plate fixed to the back plate on the side facing the inner brake pad. The back plate is a steel plate, the mating part is located on the back plate, the pin is fixed to the back plate as a whole, or the back plate has a mounting hole, and the pin is tightly fitted in the mounting hole.

[0022] In the above-mentioned disc brake, the transmission mechanism abuts against the side of the inner brake pad facing away from the outer brake pad, and the maximum lateral distance between the side of the friction plate facing the inner brake pad and the side of the inner brake pad facing away from the outer brake pad is greater than the length of the pin.

[0023] During braking, the transmission mechanism pushes the inner brake pad into contact with the brake disc, and then the caliper floats laterally to bring the outer brake pad into contact with the brake disc. As a result, the inner and outer brake pads clamp the brake disc together to brake. By ensuring that the maximum lateral distance between the side of the friction pad facing the inner brake pad and the side of the inner brake pad facing away from the outer brake pad is greater than the length of the pin, the outer brake pad can be moved laterally with the pin fully inserted into the groove when the inner brake pad and the abutment are removed, ensuring that the outer brake pad can be removed from the groove for replacement.

[0024] Compared with the existing technology, this disc brake has the following advantages:

[0025] 1. When the side of the outer brake pad facing away from the inner brake pad is against the side wall of the groove, a pin is fixed to the outer brake pad in the transverse direction. The pin passes through the caliper body and is fixedly connected to the abutment. The abutment is abutted against the outer wall of the caliper body, so that the outer brake pad and the caliper body are fixed together in the transverse direction. In this way, when the brake is released, the caliper body can actively return with the outer brake pad, thereby ensuring that the outer brake pad will no longer be tightly attached to the brake disc, so that the outer brake pad no longer relies on the centrifugal force when the brake disc rotates to return, thereby avoiding the situation of eccentric wear of the outer brake pad.

[0026] 2. A matching portion 1 is provided on the side of the outer brake pad facing away from the inner brake pad, and a matching portion 2 is provided on the inner wall of the groove. A concave-convex matching structure is formed by the matching portion 1 and the matching portion 2 along the transverse direction to limit the rotation of the outer brake pad relative to the caliper body, and the pin is fixedly connected to the matching portion at one point along the transverse direction. In this way, the matching portion 1 can be used to bear the braking torque, that is, the pin does not bear the braking torque. The pin only plays a role in cooperating with the abutment member to fix the outer brake pad and the caliper body along the transverse direction. This can ensure that the pin will not be deformed after long-term use due to bearing the braking torque, thereby ensuring the reliability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional schematic diagram of the first embodiment of the disc brake.

[0028] Figure 2 It is a three-dimensional schematic diagram of the disc brake embodiment 1 from another angle.

[0029] Figure 3 It is an exploded schematic diagram of the first embodiment of the disc brake.

[0030] Figure 4 This is a schematic diagram of another angle of decomposition of the first embodiment of the disc brake.

[0031] Figure 5 It is a three-dimensional schematic diagram of the outer brake pad in the first embodiment.

[0032] Figure 6 It is an exploded schematic diagram of the second embodiment of the disc brake.

[0033] Figure 7 It is a three-dimensional schematic diagram of the outer brake pad in the second embodiment.

[0034] In the figure, 1, caliper body; 1a, groove; 1b, mating part 2; 1c, abutment plane; 1d, through hole; 2, inner brake pad; 3, outer brake pad; 3a, back plate; 3a1, mating part 1; 3b, friction plate; 4, bracket; 5, pressure plate; 6, first spring strip; 7, pin; 8, abutment member; 9, second spring strip. 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] Example 1

[0037] like Figure 1 and Figure 2As shown, a disc brake comprises a caliper body 1 having a groove 1a at its bottom, and an inner brake pad 2 and an outer brake pad 3, both positioned within the groove 1a and arranged laterally opposite each other. In this embodiment, the "lateral" refers to the left-right direction. A transmission mechanism is provided within the caliper body 1, which abuts against the side of the inner brake pad 2 facing away from the outer brake pad 3. The transmission mechanism can drive the inner brake pad 2 toward the outer brake pad 3, thereby positioning the outer brake pad 3 on the caliper body 1. Furthermore, a bracket 4 is provided within the groove 1a, which is slidably connected to the caliper body 1 in the transverse direction (in practice, the caliper body 1 has a guide hole in the transverse direction, in which a sliding pin is slidably disposed. One end of the sliding pin extends into the groove 1a and is fixedly connected to the bracket 4. When in use, the bracket 4 is fixedly connected to the steering knuckle of the vehicle). A positioning groove is provided at the top of the bracket 4, in which the inner brake pad 2 is positioned. The caliper body 1 has a window at its top, and the groove 1a is located below the window, connecting the inner brake pad 2 and the outer brake pad 3. The length of each of the inner brake pad 2 and the outer brake pad 3 in the front-to-back direction is smaller than the window. A pressure plate 5 is fixedly connected to the top of the caliper body 1 in the horizontal direction, and the pressure plate 5 is located above the window. The top of the inner brake block 2 is connected to a first spring strip 6. The first spring strip 6 is fixedly connected to the top of the inner brake block 2 at both ends in the front-to-back direction, and the first spring strip 6 gradually bulges upward from the two ends in the front-to-back direction to the middle in an arched shape and abuts against the lower side of the pressure plate 5. The inner brake block 2 is limited in the vertical direction between the pressure plate 5 and the bottom wall of the positioning groove.

[0038] Specifically, the transmission mechanism includes a brake lever, a support body, two push rods, and two push plates. The two push rods are arranged horizontally, one of which is located directly below the other. One end of each push rod extends into the groove 1a, and the two push plates are respectively connected to the ends of the push rods located in the groove 1a. A return spring is provided between the side of the support body near the outer brake pad 3 and the caliper body 1. The brake lever acts on the support body, and the two push plates abut the side of the inner brake pad 2 facing away from the outer brake pad 3. The specific structure of the transmission mechanism is the same as that of the existing ones and will not be repeated here.

[0039] Further, if Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, the outer brake pad 3 has a mating portion 1a1 on the side facing away from the inner brake pad 2, and the inner wall of the groove 1a has a mating portion 2b. The mating portion 1a 3a1 and the mating portion 2 1b form a concave-convex mating structure in the transverse direction to limit the rotation of the outer brake pad 3 relative to the caliper body 1. The outer brake pad 3 is laterally fixedly connected to a pin 7 at the mating portion 1a1. One end of the pin 7 extends outside the caliper body 1 and is fixedly connected to a supporting member 8. The supporting member 8 abuts against the outer wall of the caliper body 1 to fix the outer brake pad 3 to the caliper body 1 in the transverse direction. Among them, the mating portion 1a1 is a boss, and the mating portion 2 1b is a mating groove. The boss is located in the mating groove and has the same shape. The pin 7 is fixedly connected to the side of the boss facing away from the inner brake pad 2. The caliper body 1 has a through hole 1d arranged in the transverse direction. One end of the through hole 1d extends through the bottom wall of the mating groove. The mating groove 1b is vertically through-set and connected to the window. The boss is rectangular and arranged along the front-to-back direction. There are at least two pins 7, distributed along the front-to-back direction. Each pin 7 has an abutment member 8 fixedly connected to its end. The abutment member 8 is a nut threaded onto the end of the pin 7. After the pin 7 passes through the caliper body 1, the nut is screwed onto the end of the pin 7 until it abuts the outer wall of the caliper body 1. This secures the outer brake pad 3 to the caliper body 1 in a transverse direction, allowing the caliper body 1 to return to its original position when the brake is released. The caliper body 1 has an abutment plane 1c. The other end of the through hole 1d extends through the abutment plane 1c. The abutment plane 1c is perpendicular to the pin 7, and the abutment member 8 abuts against the abutment plane 1c. The outer brake pad 3 includes a back plate 3a and a friction pad 3b fixed to the back plate 3a on the side facing the inner brake pad 2. The back plate 3a is a steel plate with a mating portion 1 3a1 located on the back plate 3a. The pin 7 is integrally fixed to the back plate 3a. The maximum lateral distance between the side of the friction plate 3b facing the inner brake pad 2 and the side of the inner brake pad 2 facing away from the outer brake pad 3 is greater than the length of the pin 7. In practice, the basic structure of the inner brake pad 2 is identical to that of the outer brake pad 3, except that the inner brake pad 2 lacks the mating portion 3a1 and the pin 7. A second spring pressure strip 9 is connected to the top of the outer brake pad 3. Both ends of the second spring pressure strip 9 in the front-to-back direction are fixedly attached to the top of the back plate 3a of the outer brake pad 3. The second spring pressure strip 9 gradually rises upward from its ends in the front-to-back direction toward the center, forming an arched shape that abuts against the lower side of the pressure plate 5.

[0040] During braking, the brake lever is subjected to force, pushing the support body. The support body moves and overcomes the elastic force of the return spring. In this way, the two push rods installed on the support body will push the inner brake pad 2 into contact with the brake disc through the push disc. The brake disc's lateral position is fixed, and the support body is continuously subjected to the force. At this time, the brake disc will generate a reaction force on the transmission mechanism and caliper body 1, causing the caliper body 1 to drive the outer brake pad 3 to move into contact with the brake disc, thereby clamping the brake disc and completing the braking. When the brake is released, the brake lever no longer presses on the support body, and the entire transmission mechanism is reset under the elastic force of the return spring, and the caliper body 1 also returns to its original position.

[0041] When the side of the outer brake pad 3 facing away from the inner brake pad 2 is pressed against the side wall of the groove 1a, the pin 7 is fixed to the outer brake pad 3 along the transverse direction. The pin 7 passes through the caliper body 1 and is fixedly connected to the abutment 8. The abutment 8 abuts against the outer wall of the caliper body 1, so that the outer brake pad 3 and the caliper body 1 are fixed together along the transverse direction. In this way, when the brake is released, the caliper body 1 can actively return with the outer brake pad 3, thereby ensuring that the outer brake pad 3 will no longer be pressed against the brake disc, so that the outer brake pad 3 no longer relies on the centrifugal force when the brake disc rotates to return, thereby avoiding the situation of eccentric wear of the outer brake pad 3.

[0042] In addition, a mating portion 3a1 is provided on the side of the outer brake pad 3 facing away from the inner brake pad 2, and a mating portion 1b is provided on the inner wall of the groove 1a. The mating portion 3a1 and the mating portion 1b form a concave-convex mating structure along the transverse direction to limit the rotation of the outer brake pad 3 relative to the caliper body 1, and the pin 7 is fixedly connected to the mating portion 3a1 along the transverse direction. In this way, the mating portion 3a1 can be used to bear the braking torque, that is, the pin 7 does not bear the braking torque. In this way, the pin 7 only cooperates with the abutment member 8 to fix the outer brake pad 3 and the caliper body 1 along the transverse direction, thereby ensuring that the pin 7 will not be deformed after long-term use due to bearing the braking torque, thereby ensuring the reliability of the structure.

[0043] Example 2

[0044] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 6 and Figure 7 As shown, the mating part 1 3a1 is a mating groove, the mating part 2 1b is a boss, the boss is located in the mating groove and the two have the same shape, the pin 7 is fixedly connected to the bottom wall of the mating groove, and one end opening of the through hole 1d passes through the boss.

[0045] Example 3

[0046] This embodiment has essentially the same structure and principle as the first embodiment, differing in that, in this embodiment, an annular groove is provided on the outer side of the end of the pin 7, and the abutment member 8 is a retaining ring that is retained within the annular groove. After the pin 7 passes through the caliper body 1, the retaining ring is retained within the annular groove and secured to the end of the pin 7, thereby securing the outer brake pad 3 to the caliper body 1 in a transverse direction. Thus, when the brake is released, the caliper body 1 returns to its original position, bringing the outer brake pad 3 with it.

[0047] Example 4

[0048] The structure and principle of this embodiment are basically the same as those of the first embodiment, with the difference being that in this embodiment, the back plate 3 a has a mounting hole, and the pin 7 is tightly fitted in the mounting hole.

[0049] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A disc brake, comprising a caliper body (1) having a groove (1a) at the bottom thereof, and an inner brake pad (2) and an outer brake pad (3) both located in the groove (1a) and arranged opposite to each other in the transverse direction, wherein a transmission mechanism is provided in the caliper body (1) and the transmission mechanism can drive the inner brake pad (2) toward the outer brake pad (3), and the side of the outer brake pad (3) facing away from the inner brake pad (2) is abutted against a side wall of the groove (1a), characterized in that: The outer brake block (3) has a matching portion 1 (3a1) on the side facing away from the inner brake block (2), and the inner wall of the groove (1a) is provided with a matching portion 2 (1b). The matching portion 1 (3a1) and the matching portion 2 (1b) form a concave-convex matching structure in the transverse direction to limit the rotation of the outer brake block (3) relative to the caliper body (1). The outer brake block (3) is fixedly connected to a pin (7) in the transverse direction at the matching portion 1 (3a1). One end of the pin (7) passes through the outside of the caliper body (1) and is fixedly connected to a supporting member (8). The supporting member (8) is in contact with the outer wall of the caliper body (1) to fix the outer brake block (3) and the caliper body (1) in the transverse direction.

2. A disc brake according to claim 1, characterized in that: The mating part 1 (3a1) is a boss, and the mating part 2 (1b) is a mating groove. The boss is located in the mating groove and the two have the same shape. The pin (7) is fixedly connected to the side wall of the boss facing away from the inner brake block (2). The caliper body (1) has a through hole (1d) arranged in the transverse direction, and one end of the through hole (1d) passes through the bottom wall of the mating groove.

3. The disc brake according to claim 1, characterized in that: The first mating part (3a1) is a mating groove, and the second mating part (1b) is a boss. The boss is located in the mating groove and the two have the same shape. The pin (7) is fixedly connected to the bottom wall of the mating groove. The pliers body (1) has a through hole (1d) arranged in the transverse direction, and one end of the through hole (1d) passes through the boss.

4. A disc brake according to claim 2 or 3, characterized in that: The transverse direction is the left-right direction, the boss is arranged in a rectangular shape along the front-back direction, the number of the pins (7) is at least two, each pin (7) is distributed along the front-back direction, and the end of each pin (7) is fixedly connected with a supporting member (8).

5. A disc brake according to claim 4, characterized in that: The abutting member (8) is a nut threadedly connected to the end of the pin (7).

6. The disc brake according to claim 4, characterized in that: An annular groove is provided on the outer side of the end of the pin (7), and the abutting member (8) is a retaining ring clamped in the annular groove.

7. A disc brake according to claim 2 or 3, characterized in that: The pliers body (1) has a supporting plane (1c) on the outside, the other end opening of the through hole (1d) passes through the supporting plane (1c), the supporting plane (1c) is perpendicular to the pin (7), and the supporting member (8) is in contact with the supporting plane (1c).

8. A disc brake according to claim 2 or 3, characterized in that: The outer brake block (3) includes a back plate (3a) and a friction plate (3b) fixedly connected to the back plate (3a) on the side facing the inner brake block (2), the back plate (3a) is a steel plate, the matching portion (3a1) is located on the back plate (3a), the pin (7) is fixedly connected to the back plate (3a) as a whole, or the back plate (3a) has a mounting hole, and the pin (7) is tightly fitted in the mounting hole.

9. The disc brake according to claim 8, characterized in that: The transmission mechanism abuts against the side of the inner brake block (2) facing away from the outer brake block (3), and the maximum distance in the transverse direction between the side of the friction plate (3b) facing the inner brake block (2) and the side of the inner brake block (2) facing away from the outer brake block (3) is greater than the length of the pin (7).

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