Disc brake

Abstract

The utility model provides a disc brake and belongs to the technical field of brakes. The problem that noise is large when a vehicle jolts or brakes is solved. The brake caliper comprises a caliper body, a bracket connected with the caliper body in a sliding mode and two brake pad assemblies, the two brake pad assemblies are both located between the caliper body and the bracket, a push plate is arranged in a notch, two push rods are arranged in the caliper body, the push plate abuts against the side, back on to the other brake pad assembly, of one brake pad assembly, and the push rods abut against the other brake pad assembly. One ends of the two push rods are sleeved with the push plate at the same time, the ends of the two push rods are fixedly connected with blocking pieces for preventing the push plate from being separated from the push rods respectively, shock absorption cushion blocks are arranged between the bottoms of the two brake pad assemblies and the bracket in an abutting mode, and the shock absorption cushion blocks are made of flexible materials and have elasticity; the two push rods are sleeved with wave spring washers respectively, each wave spring washer has elasticity, and each wave spring washer abuts against the position between the push plate and the blocking piece of the push rod where the wave spring washer is located. The device has the advantages of low noise and the like.

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. The two brake pad assemblies in the brake are respectively arranged on both sides of the brake disc. During braking, the two brake pad assemblies are pressed against the brake disc from both sides under the action of the braking system, and eventually lock the rotating brake disc to achieve the purpose of braking the vehicle. For example, the patent application number 201710372746.9 discloses a floating caliper radial double-push rod pneumatic disc brake, which includes a caliper body, a rotating shaft assembly, two friction blocks, a brake disc, a pressure plate and a bracket. The caliper body has a first chamber and a second chamber connected in the horizontal axial direction. The caliper body and the bracket form a floating caliper structure through a guide pin. The bracket is fixedly connected to the vehicle. The rotating shaft assembly is installed in the second chamber of the caliper body. The two friction blocks are installed on the bracket, and the friction blocks are placed in the first chamber. The two braking surfaces of the brake disc are in contact with the two friction blocks respectively. The pressure plate is installed on a pressure plate fixing member arranged on the first chamber along the vertical diameter direction. The pressure plate is installed on the pressure plate fixing member and the pressure plate presses the upper surface of the friction block through a compression spring, and the lower surface of the friction block rests on the bracket; wherein the rotating shaft assembly has two screws arranged along the horizontal axial direction and a push plate connected to one end of the two screws at the same time, and the push plate rests against one of the friction blocks along the horizontal axial direction.

[0003] During braking, the braking force is received by the rotating shaft assembly, and the two screws in the rotating shaft assembly will move along the horizontal axis and push one of the friction blocks toward the brake disc through the push plate. Since the position of the brake disc along the horizontal axis is fixed, and the rotating shaft assembly continuously receives the braking force, the brake disc will generate a reaction force on the caliper body, causing it to float, and the caliper body will drive the other friction block to come into contact with the brake disc, thereby forming two friction blocks that clamp the brake disc and gradually lock it.

[0004] However, in practice, due to the existence of processing errors, after assembly is completed, there will be gaps between the bottom of the friction block and the bracket along the vertical direction, and between the screw and the push plate along the horizontal axis. The existence of these gaps will cause rigid collisions and noise when the vehicle is bumpy or braking, which will seriously affect the passengers' riding experience. 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 to solve the problem of loud noise when the vehicle is bumpy or braked.

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

[0007] The cam is secured to the brake disc by means of a spring which is secured to the brake disc by means of a spring which is secured to the brake disc by means of a spring which is secured to the brake disc by means of a spring which is secured to the brake disc by means of a spring which is secured to the brake disc by means of a spring which is secured to the brake disc by means of a spring.

[0008] A shock-absorbing pad is provided between the bottom of the brake pad assembly and the bracket. The shock-absorbing pad is made of a flexible material and is vertically elastic. The shock-absorbing pad prevents direct contact between the brake pad assembly and the bracket. This prevents a "clicking" sound caused by rigid collision between the brake pad assembly and the bracket when the vehicle is bumped or braked. The shock-absorbing pad deforms when in contact with the bracket to provide a buffer and reduce vibration, thereby effectively reducing noise. In addition, a wave spring washer is provided on the outer surface of the push rod. The wave spring washer has a transverse elastic force and is disposed transversely between the push plate and a stopper of the push rod. Because the stopper is fixed relative to the push rod, the elastic force of the wave spring washer acts completely transversely on the push plate, thereby eliminating the play gap between the push plate and the push rod due to machining errors. This prevents the push plate from shaking due to the play gap when the vehicle is bumped, thereby effectively reducing noise.

[0009] In the above-mentioned disc brake, the brake pad assembly includes a back plate and a friction plate fixed to one side of the back plate. The edge of the back plate protrudes outside the friction plate along the four sides, and the shock-absorbing pad rests on the bottom of the back plate. The friction plates of the two brake pad assemblies are arranged opposite to each other.

[0010] The backing plate is made of steel. Its edges protrude beyond the friction pads along all four sides, preventing the pads from coming into contact with other disc brake components and causing wear beyond braking. Furthermore, noise is actually caused by the rigid impact between the backing plate and the bracket, so placing a shock-absorbing pad directly against the bottom of the backing plate can effectively reduce noise.

[0011] In the above-mentioned disc brake, the bottom of the back plate has a mounting hole, and the shock-absorbing pad is partially fixed in the mounting hole.

[0012] A mounting hole is provided at the bottom of the back plate, and then a shock-absorbing pad is fixed in the mounting hole, so that the shock-absorbing pad can be fixed to the bottom of the back plate, thereby utilizing the shock-absorbing pad to prevent the brake pad assembly from having a rigid collision with the bracket.

[0013] In the above-mentioned disc brake, the transverse direction is the left-right direction, and the number of the mounting holes and the number of the shock-absorbing pads are both two, and the two mounting holes are respectively located at the two ends of the bottom of the back plate along the front-back direction.

[0014] While the horizontal direction typically refers to the left-right direction, the front-to-back direction is actually the length of the brake pad assembly. By providing mounting holes at both ends of the backplate's bottom along the front-to-back direction, and securing a shock-absorbing pad in each mounting hole, even if the brake pad assembly tilts unilaterally along the front-to-back direction, it will not collide directly with the bracket's rigidity.

[0015] In the above-mentioned disc brake, as another technical solution, the bottom of the friction plate has a connecting hole, the shock-absorbing pad is in the shape of a sheet, and the upper side of the shock-absorbing pad has a connecting portion, the shape of the connecting portion matches the connecting hole and the shock-absorbing pad where the connecting portion is located is located at the bottom of the friction plate, and the connecting portion is fixed in the connecting hole.

[0016] In the above-mentioned disc brake, the end of the push rod has a connecting head, the push plate has a through hole, the through hole is a stepped hole, the connecting head is inserted into the through hole, the blocking member is connected to the outside of the connecting head, and the wave spring washer and the blocking member are both located in the part with a larger aperture in the through hole.

[0017] During assembly, the push rod connector is inserted into the through-hole, the wave spring washer is placed over the connector and positioned within the larger portion of the through-hole, and finally the blocking member is secured to the outside of the connector from the larger portion of the through-hole. This way, the wave spring washer will laterally abut the blocking member and the bottom wall of the larger portion of the through-hole, eliminating any lateral play between the push plate and the push rod.

[0018] In the above-mentioned disc brake, the part of the bracket located in the recess is fixedly connected with a long sliding pin and a short sliding pin in the transverse direction at both ends along the front-to-back direction, and the caliper body is correspondingly provided with a long sliding pin hole and a short sliding pin hole. The long sliding pin is located in the long sliding pin hole, and the short sliding pin is located in the short sliding pin hole. A long bushing is provided between the long sliding pin and the long sliding pin hole, and the inner hole of the long bushing is a circular hole. A short bushing is provided between the short sliding pin and the short sliding pin hole, and the inner hole of the short bushing is an elliptical hole. The short axis of the inner hole of the short bushing is arranged along the up and down direction.

[0019] With the long pin positioned within the long pin hole and the short pin within the short pin hole, the bracket can slide laterally relative to the caliper body. The short and long bushings are provided for wear resistance. The long pin primarily guides and withstands torsional forces (torsional forces refer to the rotational force applied to the bracket by the brake disc through the brake pad assembly during braking), while the short pin provides auxiliary support. Typically, to ensure reliable sliding, the inner bore of the long bushing is larger than the outer dimensions of the long pin, and the inner bore of the short bushing is larger than the outer dimensions of the short pin. However, this size difference can cause unusual noise when the vehicle is jolted. To address this, the inner bore of the short bushing is designed as an elliptical hole. The long axis of the short bushing's inner bore provides sufficient space for the bracket to move under the rotational force applied by the brake disc. The short axis of the short bushing's inner bore is arranged in the vertical direction, which effectively controls the clearance between the short pin and the inner bore wall of the short bushing (the collision direction between the short pin and the short bushing during jolting is in the vertical direction), thereby effectively reducing unusual noise.

[0020] In the above-mentioned disc brake, the inner hole wall of the short bushing is provided with grooves at both ends of the major axis of the ellipse.

[0021] The arrangement of the two grooves enables the short bushing to cooperate with the tool, ensuring that after the short bushing is inserted into the short sliding pin hole, the short axis of the inner hole is arranged in the up-down direction.

[0022] Compared with the existing technology, this disc brake has the following advantages:

[0023] 1. A shock-absorbing pad is installed between the bottom of the brake pad assembly and the bracket. The shock-absorbing pad is made of a flexible material and has elasticity in the vertical direction. The shock-absorbing pad prevents the brake pad assembly from directly contacting the bracket. This prevents rigid collision between the brake pad assembly and the bracket when the vehicle is bumpy or braking. The shock-absorbing pad can also cushion the vibration by deforming when in contact with the bracket, thereby effectively reducing noise.

[0024] 2. A wave spring washer is arranged outside the push rod. The wave spring washer has elastic force in the transverse direction. The wave spring washer is arranged to abut against the push plate and the blocking member of the push rod in the transverse direction. Since the blocking member is fixed relative to the push rod, the elastic force of the wave spring washer acts completely on the push plate in the transverse direction, thereby eliminating the play gap between the push plate and the push rod due to processing error, so that the push plate will no longer shake when the vehicle is bumpy due to the existence of the play gap, thereby greatly reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of this disc brake.

[0026] Figure 2It is a three-dimensional schematic diagram of the disc brake from another angle.

[0027] Figure 3 It is a top view of the disc brake.

[0028] Figure 4 yes Figure 3 Cross-sectional view along the AA axis.

[0029] Figure 5 yes Figure 4 Cross-sectional view along the BB direction.

[0030] Figure 6 yes Figure 5 A partial enlarged view of the middle support.

[0031] Figure 7 It is a schematic diagram of the cooperation between the brake pad assembly and the bracket.

[0032] Figure 8 This is an exploded diagram of the brake pad assembly and the bracket.

[0033] Figure 9 It is a three-dimensional schematic diagram of the brake pad assembly.

[0034] Figure 10 It is a plan view of one side of the disc brake along the transverse direction.

[0035] Figure 11 yes Figure 10 Cross-sectional view along CC direction.

[0036] Figure 12 yes Figure 10 Cross-sectional view along the DD direction.

[0037] Figure 13 It is a plan view of the short sliding pin and short bushing.

[0038] Figure 14 It is a three-dimensional schematic diagram of the brake pad assembly in the second embodiment.

[0039] Figure 15 It is a three-dimensional schematic diagram of the brake pad assembly in the third embodiment.

[0040] Figure 16 It is a three-dimensional schematic diagram of the brake pad assembly in the fourth embodiment.

[0041] In the figure, 1, caliper body; 1a, notch; 1b, long slide pin hole; 1c, short slide pin hole; 2, bracket; 2a, positioning groove; 3, brake pad assembly; 3a, back plate; 3b, friction plate; 4, pressure plate; 5, spring pressure strip; 6, push rod; 6a, connector; 7, push plate; 7a, through hole; 8, support body; 9, brake lever; 10, return spring; 11, shock-absorbing pad; 12, blocking member; 13, wave spring washer; 14, long slide pin; 15, short slide pin; 16, long bushing; 17, short bushing; 17a, groove. DETAILED DESCRIPTION

[0042] 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.

[0043] Example 1

[0044] like Figures 1-8 As shown, the disc brake comprises a caliper body 1 having a recess 1a at its bottom, a bracket 2 slidably connected to the caliper body 1 in a transverse direction and partially positioned within the recess 1a, and two brake pad assemblies 3 disposed in opposite transverse directions within the recess 1a. In this embodiment, the transverse direction refers to the left-right direction. The two brake pad assemblies 3 are vertically positioned between the caliper body 1 and the bracket 2. Specifically, the bracket 2 has two positioning grooves 2a at its top, and the two brake pad assemblies 3 are respectively positioned within the two positioning grooves 2a. The caliper body 1 has a window at its top, which is located directly above the recess 1a and communicates with each other. A pressure plate 4 is fixedly connected to the top of the caliper body 1 in a transverse direction and positioned above the window. A spring pressure strip 5 is connected to the top of each brake pad assembly 3. The spring pressure strip 5 is arranged in an upwardly convex arc shape along the front-to-back direction. The two ends of the spring pressure strip 5 are fixedly connected to the top of the corresponding brake pad assembly 3, and the arched portion of the spring pressure strip 5 abuts the underside of the pressure plate 4. A push plate 7 is provided in the recess 1a, resting against the side of one brake pad assembly 3 facing away from the other brake pad assembly 3. Push rods 6 are laterally disposed within the caliper body 1, with one end of each push rod 6 located within the recess 1a and connected to the push plate 7. In practice, the caliper body 1 also includes a support body 8 and a brake lever 9. The two push rods 6 are disposed parallel to the support body 8. A return spring 10 is provided between the side of the support body 8 closest to the push plate 7 and the caliper body 1, and the brake lever 9 acts on the support body 8. During braking, the brake lever 9 is subjected to force and pushes the support body 8 to overcome the elastic force of the return spring 10, causing the two push rods 6 to move. The two push rods 6 are disposed on the support body 8, so that they move and, through the push plate 7, push the brake pad assembly 3 abutting against them toward the other brake pad assembly 3.

[0045] During braking, the brake lever 9 is subjected to force, pushing the support body 8. The support body 8 moves and overcomes the elastic force of the return spring 10. In this way, the two push rods 6 provided on the support body 8 push the brake pad assembly 3 abutting against it into contact with the brake disc via the push plate 7. The brake disc's lateral position remains fixed, and the support body 8 is continuously subjected to the force. At this time, the brake disc generates a reaction force on the support body 8 and the caliper body 1, causing the caliper body 1 to drive the other brake pad assembly 3 to move into contact with the brake disc, thereby clamping the brake disc and completing the braking.

[0046] Further, if Figure 8 and Figure 9 As shown, a shock-absorbing pad 11 is disposed between the bottom of each brake pad assembly 3 and the bottom wall of the positioning groove 2a of the bracket 2. Each shock-absorbing pad 11 is made of a flexible material and is elastic in the vertical direction. Shock-absorbing pads 11 are disposed between the bottom of the brake pad assembly 3 and the bracket 2. Shock-absorbing pads 11 are made of a flexible material and are elastic in the vertical direction. Shock-absorbing pads 11 prevent direct contact between the brake pad assembly 3 and the bracket 2. This prevents a rigid collision between the brake pad assembly 3 and the bracket 2 from producing a "clicking" sound when the vehicle is bumpy or braking. Furthermore, the shock-absorbing pads 11 can deform to provide a buffer when in contact with the bracket 2, reducing vibration and thus significantly reducing noise. Specifically, the brake pad assembly 3 comprises a backing plate 3a and a friction pad 3b fixed to one side of the backing plate 3a. The backing plate 3a is made of steel, with its edges protruding from the friction pad 3b along its perimeter. The friction pads 3b of the two brake pad assemblies 3 are positioned opposite each other. The ends of the spring pressure strip 5 are fixedly connected to the top of the backing plate 3a of the corresponding brake pad assembly 3, and a shock-absorbing pad 11 abuts against the bottom of the backing plate 3a. The bottom of the backing plate 3a has a mounting hole. The shock-absorbing pad 11 is cylindrical and fixed within the mounting hole, with its lower end protruding from the bottom surface of the backing plate 3a. In this embodiment, there are two mounting holes, located at either end of the bottom of the backing plate 3a along the front-to-back direction. Each mounting hole houses the aforementioned shock-absorbing pad 11. The transverse direction generally refers to the left-to-right direction, so the front-to-back direction is actually the length of the brake pad assembly 3. By setting mounting holes at both ends of the bottom of the back plate 3a in the front-to-back direction, a shock-absorbing pad 11 is fixed in each mounting hole. In this way, even if the brake pad assembly 3 is unilaterally tilted in the front-to-back direction, it will not directly collide with the bracket 2.

[0047] Further, if Figure 6As shown, the push plate 7 is simultaneously mounted on one end of the two push rods 6. The ends of the two push rods 6 are each connected to a stopper 12, which is a retaining ring in practice, to prevent the push plate 7 from separating from the push rods 6. A wave spring washer 13 is mounted on the outside of each push rod 6. Each wave spring washer 13 has a transverse elastic force and is positioned laterally between the push plate 7 and the stopper 12 of the push rod 6 on which it is mounted. A wave spring washer 13 is mounted on the outside of the push rods 6. Each wave spring washer 13 has a transverse elastic force and is positioned laterally between the push plate 7 and the stopper 12 of the push rod 6 on which it is mounted. Because the stopper 12 is fixed relative to the push rod 6, the elastic force of the wave spring washer 13 is fully applied laterally to the push plate 7. This eliminates the play between the push plate 7 and the push rod 6 caused by manufacturing errors, preventing the push plate 7 from shaking during vehicle bumps due to the play, thereby significantly reducing noise. The end of the push rod 6 has a connector 6a, and the push plate 7 has a through hole 7a. The through hole 7a is a stepped hole, and the connector 6a passes through the through hole 7a. The blocking member 12 is connected to the outside of the connector 6a. The wave spring washer 13 and the blocking member 12 are both located in the larger portion of the through hole 7a. The troughs of the wave spring washer 13 abut against the blocking member 12, and the peaks of the wave spring washer 13 abut against the bottom wall of the larger portion of the through hole 7a. The peaks and troughs of the wave spring washer 13 are spaced apart, which ensures that the push plate 7 is subjected to a more stable elastic force, ensuring that there is no gap between the push plate 7 and the push rod 6 in the axial direction, thereby avoiding noise at this location.

[0048] Furthermore, if Figure 2 、 Figure 10 、 Figure 11 、 Figure 12 and Figure 13 As shown, the portion of the bracket 2 located within the recess 1a is laterally secured to both ends of the bracket 2 in the front-to-back direction with a long sliding pin 14 and a short sliding pin 15. Both long sliding pin 14 and short sliding pin 15 are secured to the bracket 2 via screws. The caliper body 1 is correspondingly provided with a long sliding pin hole 1b and a short sliding pin hole 1c. The long sliding pin 14 is located within the long sliding pin hole 1b, with a long bushing 16 disposed between them. The short sliding pin 15 is located within the short sliding pin hole 1c, with a short bushing 17 disposed between them. The inner hole of the long bushing 16 is circular, while the inner hole of the short bushing 17 is elliptical, with the minor axis of the inner hole of the short bushing 17 extending vertically. The inner wall of the short bushing 17 is provided with grooves 17a at both ends of the major axis of the ellipse.

[0049] Example 2

[0050] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 14As shown, in this embodiment, the shock-absorbing pad 11 is in the shape of a square sheet, and the upper side of the shock-absorbing pad 11 has a columnar portion, which is fixed in the mounting hole.

[0051] Example 3

[0052] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 15 As shown, the shock-absorbing pad 11 is in the shape of a rectangular sheet. The length direction of the shock-absorbing pad 11 is arranged along the front-to-back direction. The upper side of the shock-absorbing pad 11 has a columnar portion, which is fixed in the mounting hole.

[0053] Example 4

[0054] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 16 As shown, in this embodiment, the bottom of the friction plate 3b has a connecting hole, the shock-absorbing pad 11 is in a sheet shape, and the upper side of the shock-absorbing pad 11 has a connecting portion, the shape of the connecting portion matches the connecting hole and the shock-absorbing pad 11 where the connecting portion is located is located at the bottom of the friction plate 3b, and the connecting portion is fixed in the connecting hole.

[0055] 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) with a notch (1a) at the bottom, a bracket (2) connected to the caliper body (1) in a transverse sliding manner, and two brake pad assemblies (3) arranged in the notch (1a) in a transverse direction relative to each other, the two brake pad assemblies (3) are both positioned between the caliper body (1) and the bracket (2) in a vertical direction, a push plate (7) is provided in the notch (1a), and two push rods (6) are arranged in the caliper body (1) in a transverse direction, the push plate (7) abuts against the side of one of the brake pad assemblies (3) facing away from the other brake pad assembly (3), the push plate (7) is simultaneously sleeved on one end of the two push rods (6), and the ends of the two push rods (6) are respectively fixed with a blocking member (12) for preventing the push plate (7) from separating from the push rods (6), characterized in that Shock-absorbing pads (11) are disposed between the bottoms of the two brake pad assemblies (3) and the bracket (2), each of which is made of a flexible material and has elasticity in the vertical direction. Wave spring washers (13) are respectively sleeved on the outside of the two push rods (6), each of which has elasticity in the transverse direction, and each of which is disposed between the push plate (7) and the blocking member (12) of the push rod (6) in the transverse direction.

2. The disc brake according to claim 1, wherein: The brake pad assembly (3) includes a back plate (3a) and a friction plate (3b) fixed to one side of the back plate (3a); the edge of the back plate (3a) protrudes outside the friction plate (3b) along all sides; the shock-absorbing pad (11) abuts against the bottom of the back plate (3a); and the friction plates (3b) of the two brake pad assemblies (3) are arranged opposite to each other.

3. The disc brake according to claim 2, wherein: The bottom of the back plate (3a) is provided with a mounting hole, and the shock-absorbing pad (11) is partially fixed in the mounting hole.

4. The disc brake according to claim 3, wherein: The transverse direction is the left-right direction. The number of the mounting holes and the shock-absorbing pad (11) are both two, and the two mounting holes are respectively located at the two end positions of the bottom of the back plate (3a) along the front-back direction.

5. The disc brake according to claim 2, wherein: The bottom of the friction plate (3b) is provided with a connecting hole, the shock-absorbing pad (11) is in a sheet shape, and the upper side of the shock-absorbing pad (11) is provided with a connecting portion, the shape of the connecting portion matches the connecting hole, and the shock-absorbing pad (11) where the connecting portion is located is located at the bottom of the friction plate (3b), and the connecting portion is fixed in the connecting hole.

6. The disc brake according to claim 1 or 2, characterized in that The end of the push rod (6) has a connector (6a), the push plate (7) has a through hole (7a), the through hole (7a) is a stepped hole, the connector (6a) is inserted into the through hole (7a), the blocking member (12) is connected to the outside of the connector (6a), and the wave spring washer (13) and the blocking member (12) are both located in the part with a larger aperture in the through hole (7a).

7. The disc brake according to claim 1 or 2, characterized in that The bracket (2) is located in the notch (1a), and the two ends of the portion thereof in the front-back direction are respectively fixedly connected with a long sliding pin (14) and a short sliding pin (15) in the transverse direction. The caliper body (1) is correspondingly provided with a long sliding pin hole (1b) and a short sliding pin hole (1c). The long sliding pin (14) is located in the long sliding pin hole (1b), and the short sliding pin (15) is located in the short sliding pin hole (1c). A long bushing (16) is provided between the long sliding pin (14) and the long sliding pin hole (1b), and the inner hole of the long bushing (16) is a circular hole. A short bushing (17) is provided between the short sliding pin (15) and the short sliding pin hole (1c), and the inner hole of the short bushing (17) is an elliptical hole. The short axis of the inner hole of the short bushing (17) is provided in the up-down direction.

8. The disc brake according to claim 7, wherein: The inner hole wall of the short bushing (17) is provided with grooves (17a) at both ends of the major axis of the ellipse.

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