A disc brake

Abstract

The utility model provides a disc brake belongs to brake technical field. It has solved the problem of the increased drag torque when the vehicle is running subsequently for the cushioning and damping. It includes the jaw body with the recess of bottom, the bracket with two locating grooves of top and respectively being located in two locating grooves and opposite setting along the front -back direction main brake pad and vice brake pad, is provided with the pusher assembly on the jaw body, and the main brake pad is fixed along the front -back direction with the pusher assembly, and the rear side of main brake pad is equipped with cooperation hole no. 1, and the pusher assembly has the connector, and the connector is fixed with the cooperation head, and the cooperation head is located in cooperation hole no. 1, and the outer circumferential side of cooperation head is equipped with annular limit piece no. 1, and annular limit piece no. 1 is made of flexible material and has elasticity, and the outer circumferential wall of annular limit piece no. 1 is in abutment with the hole wall of cooperation hole no. 1, and the bottom surface of main brake pad has the first gap with the groove bottom wall of the locating groove. It has reduced the drag torque while guaranteeing the cushioning and damping function.

Description

Technical Field

[0001] This utility model belongs to the field of braking technology and relates to a disc brake. Background Technology

[0002] Disc brakes are a common type of brake used on passenger and freight vehicle wheels. They achieve braking by locking the rotating brake disc. A disc brake consists of a caliper, a bracket, main brake pads, and auxiliary brake pads. The bracket is fixedly connected to the vehicle. The bottom of the caliper has a notch, within which the bracket is located. The main and auxiliary brake pads are also located within the caliper. The top of the bracket has two positioning slots, where the main and auxiliary brake pads are respectively positioned. The caliper also contains a pusher assembly for moving the main brake pads, which are located on either side of the brake disc. During braking, the pusher assembly pushes the main brake pads into contact with the brake disc. The brake disc remains in a fixed position, while the pusher assembly continues to be driven. This causes the brake disc to exert a reaction force on the caliper, causing it to float. The caliper then moves the auxiliary brake pads into contact with the brake disc, thus locking the brake disc between the main and auxiliary brake pads. After braking, the push assembly resets, and the main brake pad and auxiliary brake pad reset under the centrifugal force of the rotating brake disc. For the basic structure and working principle of the disc brake, please refer to the floating caliper type radial double push rod pneumatic disc brake disclosed in application number 201710372746.9.

[0003] When a vehicle is traveling on bumpy roads, the brake pads bounce up and down, causing rigid collisions between the brake pads and the bottom wall of their mounting slots, resulting in a continuous "clunking" sound. This severely impacts passenger comfort. To address this, Chinese Patent Application No. 201320062116.9 discloses a friction block comprising a friction pad and a back plate. The friction pad is fixedly connected to the back plate, and the side of the back plate that contacts the bracket has a drilled hole. A sound-absorbing pad is fixedly connected within the drilled hole, and the surface of the sound-absorbing pad protrudes from the back plate. The sound-absorbing pad features high toughness, flexibility, resistance to high and low temperatures, and shock absorption, acting as a buffer. When the friction block quickly returns to the bracket, the sound-absorbing pad prevents direct collision between the friction block and the bracket, thus eliminating the "clunking" sound when the friction block returns.

[0004] The presence of sound-dampening pads means they must be in contact with the brake disc. Since these pads are made of rubber, this obviously increases the sliding resistance when the brake pads return to their original position. This causes the brake pads to fail to return to their original position stably and promptly after braking, meaning there will be instances where the brake pads remain attached to the brake disc after braking. This results in residual braking torque during subsequent vehicle movement, creating a drag torque. The presence of this drag torque increases the vehicle's energy consumption. In other words, while sound-dampening pads can provide cushioning and shock absorption, they hinder the return of the main brake pads, leading to increased drag torque during subsequent vehicle movement.

[0005] Regarding how to reduce drag torque, conventional technical means used by those skilled in the art include: 1. using high-performance lubricating grease and other materials to reduce return resistance; 2. improving the active return capability of the friction plate by setting a return spring. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a disc brake that solves the problem of increased drag torque during subsequent vehicle movement caused by shock absorption.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A disc brake includes a caliper body with a notch at the bottom, a bracket partially located within the notch and having two positioning grooves at the top, and a main brake pad and a secondary brake pad respectively disposed in the two positioning grooves and arranged opposite each other in the front-rear direction. The bracket and the caliper body are slidably connected in the front-rear direction. A pushing component capable of reciprocating back-and-forth movement is provided on the caliper body. The main brake pad and the pushing component are fixed in the front-rear direction. A mating hole is provided on the rear side of the main brake pad. The pushing component has a connector head, and a mating head is fixed on the connector head. The mating head is located in the mating hole. An annular limiting member is provided on the outer periphery of the mating head. The annular limiting member is made of a flexible material and is elastic. The outer periphery of the annular limiting member abuts against the hole wall of the mating hole. A first gap exists between the bottom surface of the main brake pad and the bottom wall of the positioning groove.

[0009] During braking, the push assembly is driven forward, bringing the main brake pad into contact with the brake disc. Since the brake disc's position in the longitudinal direction remains fixed, and the push assembly is continuously driven, the brake disc generates a reaction force on the caliper via the push assembly. This causes the caliper, carrying the auxiliary brake pad, to move backward until it contacts the brake disc, thus clamping the disc and completing braking. After braking ends, the push assembly is no longer driven and resets. Because the main brake pad is fixed to the push assembly in the longitudinal direction, the main brake pad resets along with the push assembly.

[0010] Because a mating hole is provided on the rear side of the main brake pad and a connector is provided on the push assembly, the mating head is fixed on the connector. The mating head is located inside the mating hole, and an annular limiting member is provided on the outer periphery of the mating head. The outer peripheral wall of the annular limiting member abuts against the hole wall of the mating hole, allowing the main brake pad to be suspended on the push assembly. This creates a first gap between the bottom surface of the main brake pad and the bottom wall of the positioning groove, meaning that the bottom surface of the main brake pad is not in contact with the bottom wall of the positioning groove. This lack of contact means that the bracket will not generate resistance to the main brake pad when it resets, thus reducing the sliding resistance when the main brake pad returns to its original position. This allows the main brake pad to quickly and stably return to its original position, thereby reducing or even eliminating the braking drag torque experienced by the vehicle during subsequent driving. The main brake pad resetting together with the push assembly means that the mating head will not detach from the mating hole, and the annular limiting member will not generate resistance to the return of the main brake pad. Furthermore, the annular limiting component is annular and elastic. This allows it to cushion and absorb shocks when the main brake pads move up and down during vehicle operation, thanks to the compression deformation of the annular limiting component. In other words, this design ensures both shock absorption and reduced drag torque in this disc brake.

[0011] In the aforementioned disc brake, a buffer gap is provided between the outer peripheral wall of the mating head and the wall of the mating hole. The outer peripheral side of the mating head is provided with an annular mounting groove, and an annular limiting member is located inside the annular mounting groove and protrudes radially out of the annular mounting groove. Alternatively, the wall of the mating hole is provided with an annular groove, and an annular limiting member is located inside the annular groove and protrudes radially out of the annular groove.

[0012] A buffer gap exists between the outer peripheral wall of the mating head and the wall of the mating hole, allowing the main brake pad to float up and down relative to the pushing assembly when the vehicle is bumpy. Furthermore, an annular mounting groove is provided on the outer peripheral side of the mating head. An annular limiting member is located within the annular mounting groove and protrudes radially from it. The annular mounting groove positions the annular limiting member, while its radial protrusion ensures it functions effectively when the main brake pad floats up and down. This prevents the limiting member from shifting during vehicle movement, which could cause the bottom surface of the main brake pad to contact the bottom wall of the positioning groove or compromise the damping function, thus ensuring structural stability.

[0013] In addition to the above-mentioned settings, an annular groove is also provided on the wall of the mating hole. An annular limiting member is located inside the annular groove and protrudes radially out of the annular groove. The annular groove can also position the annular limiting member. The radial protrusion of the annular limiting member ensures that it can function when the main brake pad moves up and down. This prevents the annular limiting member from shifting during vehicle bumpy driving, which would cause the bottom surface of the main brake pad to contact the bottom wall of the positioning groove or affect the buffering and shock absorption function, thus ensuring the stability of the structure.

[0014] In the aforementioned disc brake, there are two connectors, each with a mating head fixed along its edge, and each of the two mating heads has an annular limiting member on its outer periphery.

[0015] The above settings ensure that the main brake pad will not sway around the mating head, causing the bottom surface of the pad to come into contact with the bottom wall of the positioning groove, thus further ensuring the reliability of the disc brake in reducing drag torque.

[0016] In the aforementioned disc brake, the pushing assembly includes two push rods and two push discs. The two push rods are at the same height and parallel to each other. The two push rods can move synchronously in the front-back direction. Two connecting heads are respectively protruding from the front ends of the two push rods. The two push discs are respectively sleeved on the two connecting heads and respectively fixed to the main brake pad in the front-back direction. Two mating heads respectively position the two push discs on the two connecting heads.

[0017] Specifically, during braking, two push rods are driven to move forward simultaneously, pushing the main brake pad forward until it contacts the brake disc via two push discs. Two connectors protrude from the front ends of the two push rods, and the two push discs are respectively fitted onto the two connectors, with two mating heads positioning them on the connectors. These mating heads also serve to position the push discs. Since the two push discs are fixed to the main brake pad in the front-rear direction, and the push discs are positioned on the connectors by the mating heads, when the two push rods reset, they will move the push discs and the main brake pad together with them.

[0018] The connector protrudes from the front end of the push rod, which is equivalent to extending the push rod. This allows the main brake pad to be hung on the push rod and form a first gap with the bottom wall of the positioning groove to reduce drag torque during return.

[0019] In the aforementioned disc brake, each of the two push discs has a positioning hole on its front side, and a magnet is fixed inside the positioning hole. Both magnets are attracted to the main brake pad.

[0020] By attracting the main brake pad with magnet one, the main brake pad is fixed to the push assembly in the front-to-back direction. This ensures that the main brake pad is reset along with the push assembly when it resets, preventing the mating head from detaching from the mating hole one and reducing drag torque. Furthermore, by providing a positioning hole on the front side of the push plate, magnet one is directly fixed in the positioning hole, thus making efficient use of the push plate and eliminating the need for additional components for installing magnet one.

[0021] In one of the disc brakes described above, as another technical solution, the pushing assembly includes two push rods and a push plate. The two push rods are of the same height and parallel to each other. The two push rods can move synchronously in the front and back direction. Two connecting heads are respectively protruding from the front ends of the two push rods. The push plate is simultaneously sleeved on the two connecting heads and fixed to the main brake pad in the front and back direction. The two mating heads simultaneously position the push plate on the two connecting heads. The front side of the push plate is provided with a concave hole, and a magnet is fixed in the concave hole. The magnet attracts the main brake pad.

[0022] Specifically, during braking, two push rods are driven to move forward simultaneously, pushing the main brake pad forward until it contacts the brake disc via a push plate. Two connectors protrude from the front ends of the two push rods. The push plate is simultaneously fitted onto the two connectors, and two mating heads simultaneously position the push plate on the connectors. Thus, the mating heads also serve to position the push plate. Since the push plate and the main brake pad are fixed together in the front-rear direction, and the push plate is positioned on the connectors by the mating heads, the push plate and the main brake pad will return to their original positions along with the two push rods when they reset. The connectors protruding from the front ends of the push rods essentially extend the push rods, allowing the main brake pad to hang on the push rods and form a first gap between it and the bottom wall of the positioning groove to reduce drag torque during return.

[0023] By attracting the main brake pad with magnet one, the main brake pad can be fixed together with the push assembly in the front-to-back direction. This allows the main brake pad to be reset together with the push assembly when it resets, preventing the mating head from coming out of the mating hole one and reducing the dragging torque.

[0024] A disc brake includes a caliper body with a notch at the bottom, a bracket partially located within the notch and having two positioning grooves at the top, and a main brake pad and a secondary brake pad respectively disposed in the two positioning grooves and arranged opposite each other in the front-rear direction. The bracket and the caliper body are slidably connected in the front-rear direction. A pushing component capable of reciprocating back-and-forth movement is provided on the caliper body. The secondary brake pad is fixed to the caliper body in the front-rear direction. A second mating hole is provided on the front side of the secondary brake pad. An mounting head is fixed on the caliper body and is located within the second mating hole. An annular limiting member is provided on the outer periphery of the mounting head. The annular limiting member is made of a flexible material and is elastic. The outer periphery of the annular limiting member abuts against the wall of the second mating hole, creating a second gap between the bottom surface of the secondary brake pad and the bottom wall of the positioning groove.

[0025] During braking, the push assembly is driven forward, bringing the main brake pad into contact with the brake disc. Since the brake disc's position in the longitudinal direction remains fixed, and the push assembly is continuously driven, the brake disc generates a reaction force on the caliper via the push assembly. This causes the caliper, carrying the auxiliary brake pad, to move backward until it contacts the brake disc, thus clamping the disc and completing braking. After braking ends, the push assembly is no longer driven and resets. Because the main brake pad is fixed to the push assembly in the longitudinal direction, it resets along with the push assembly. Simultaneously, the caliper also resets, and because the caliper is attracted to the auxiliary brake pad via magnet two, the auxiliary brake pad resets along with the caliper.

[0026] Because the secondary brake pad has a mating hole two on its front side and an mounting head on the caliper body, the mounting head is located inside the mating hole two, and an annular limiting member two is provided on the outer periphery of the mounting head. The outer periphery of the annular limiting member two abuts against the wall of the mating hole two, allowing the secondary brake pad to be suspended on the caliper body. This creates a second gap between the bottom surface of the secondary brake pad and the bottom wall of the positioning groove, meaning the bottom surface of the secondary brake pad is not in contact with the bottom wall of the positioning groove. This lack of contact means the bracket will not resist the secondary brake pad when it resets, reducing the sliding resistance during return and allowing the secondary brake pad to quickly and stably return to its original position. This reduces or even eliminates the braking drag torque experienced by the vehicle during subsequent driving. The secondary brake pad resetting together with the caliper body means the mounting head will not detach from the mating hole two, and the annular limiting member two will not resist the return of the secondary brake pad. Furthermore, the second annular limiting member is annular and elastic. This allows it to buffer and dampen shocks in the event of vertical movement of the auxiliary brake pads during vehicle operation, through the compression deformation of the second annular limiting member. In other words, this design ensures both shock absorption and reduced drag torque in this disc brake.

[0027] In the aforementioned disc brake, there is a buffer gap between the outer peripheral wall of the mounting head and the wall of the mating hole two. The outer peripheral side of the mounting head is provided with an annular mounting groove two, and the annular limiting member two is located inside the annular mounting groove two and protrudes radially out of the annular mounting groove two. Alternatively, the wall of the mating hole two is provided with an annular groove two, and the annular limiting member two is located inside the annular groove two and protrudes radially out of the annular groove two.

[0028] A buffer gap exists between the outer peripheral wall of the mounting head and the wall of the mating hole two, allowing the auxiliary brake pad to float up and down relative to the caliper body when the vehicle is bumpy. Based on this, an annular mounting groove two is provided on the outer peripheral side of the mounting head. An annular limiting member two is located within the annular mounting groove two and protrudes radially from it. The annular mounting groove two provides positioning for the annular limiting member two, while the radial protrusion of the annular limiting member two ensures that it functions effectively when the auxiliary brake pad floats up and down. This prevents the annular limiting member two from shifting during vehicle bumpy driving, which could cause the bottom surface of the auxiliary brake pad to contact the bottom wall of the positioning groove or affect the cushioning and shock absorption function, thus ensuring structural stability.

[0029] In addition to the above-mentioned settings, an annular groove 2 is also provided on the wall of the mating hole 2. The annular limiting member 2 is located inside the annular groove 2 and protrudes radially out of the annular groove 2. The annular groove 2 can also provide a positioning function for the annular limiting member 2. The radial protrusion of the annular limiting member 2 out of the annular groove 2 ensures that the annular limiting member 2 can function when the auxiliary brake pad moves up and down. This prevents the annular limiting member 2 from shifting during the vehicle's bumpy driving, which would cause the bottom surface of the auxiliary brake pad to contact the bottom wall of the positioning groove or affect the buffering and shock absorption function, thus ensuring the stability of the structure.

[0030] In the aforementioned disc brake, the caliper body has a mounting hole on its surface facing the auxiliary brake pad, and a second magnet is fixed inside the mounting hole, which attracts the auxiliary brake pad.

[0031] By attracting the main brake pad with magnet two, the caliper body can be fixed together with the auxiliary brake pad in the front-to-back direction. This allows the auxiliary brake pad to be reset together with the caliper body when it resets, preventing the mounting head from coming out of the mating hole two and reducing drag torque.

[0032] In the aforementioned disc brake, the mounting hole is stepped, and the second magnet is fixed within the larger portion of the mounting hole. The second magnet is annular, and the mounting head passes through the central hole of the second magnet and is fixed within the smaller portion of the mounting hole.

[0033] With the above settings, the magnet and the mounting head can be fixed on the clamp body through the same mounting hole without interfering with each other.

[0034] Compared with existing technologies, this disc brake has the following advantages:

[0035] 1. By providing a mating hole on the rear side of the main brake pad and a connector on the push assembly, the mating head is fixed to the connector. The mating head is located within the mating hole, and an annular limiting member is provided on the outer periphery of the mating head. The outer periphery of the annular limiting member abuts against the wall of the mating hole, allowing the main brake pad to be suspended on the push assembly. This creates a first gap between the bottom surface of the main brake pad and the bottom wall of the positioning groove, preventing the bracket from resisting the main brake pad during repositioning. This reduces the sliding resistance of the main brake pad during return, allowing it to quickly and stably return to its original position, thereby reducing or even eliminating the braking drag torque experienced by the vehicle during subsequent driving. Furthermore, the annular limiting member is annular and elastic, and its compression deformation ensures the required buffering and shock absorption function.

[0036] 2. By providing a mating hole two on the front side of the auxiliary brake pad and a mounting head on the caliper body, and a second annular limiting member two on the outer periphery of the mounting head, the outer peripheral wall of the second annular limiting member abuts against the wall of the mating hole two. This allows the auxiliary brake pad to be suspended on the caliper body, creating a second gap between the bottom surface of the auxiliary brake pad and the bottom wall of the positioning groove. This prevents the bracket from resisting the auxiliary brake pad when it returns to its original position, reducing the sliding resistance during return and allowing the auxiliary brake pad to return quickly and stably. This reduces or even eliminates the braking drag torque experienced by the vehicle during subsequent driving. Furthermore, the second annular limiting member two is annular and elastic, and its compression deformation ensures the required buffering and shock absorption function. Attached Figure Description

[0037] Figure 1 This is a three-dimensional schematic diagram of a disc brake.

[0038] Figure 2 This is a three-dimensional schematic diagram of a disc brake from another angle.

[0039] Figure 3 This is a partially exploded schematic diagram of a disc brake.

[0040] Figure 4 This is a schematic diagram of the rear side of a disc brake.

[0041] Figure 5 yes Figure 4 Sectional view along the AA direction.

[0042] Figure 6 yes Figure 5 A magnified view of the joint in the middle.

[0043] Figure 7 yes Figure 5 A magnified view of the mounting head in the middle.

[0044] Figure 8 yes Figure 4 Sectional view along the BB direction.

[0045] Figure 9 yes Figure 8 A magnified view of a section of the main brake pad.

[0046] Figure 10 yes Figure 8 A magnified view of a portion of the intermediate brake pad.

[0047] Figure 11 This is a schematic diagram of the push component (without the mating head).

[0048] In the diagram, 1. Clamp body; 1a. Notch; 1b. Mounting hole; 2. Bracket; 2a. Positioning groove; 3. Main brake pad; 3a. Mating hole one; 4. Secondary brake pad; 4a. Mating hole two; 5. Pressure plate; 6. Spring pressure bar; 7. Push assembly; 7a. Connector; 8. Mating head; 8a. Annular mounting groove one; 9. Annular limiting component one; 10. Push rod; 11. Push plate; 11a. Positioning hole; 12. Support body; 13. Brake lever; 14. Screw; 15. Return spring; 16. Synchronizing rod; 17. Magnet one; 18. Snap ring; 19. Mounting head; 19a. Annular mounting groove two; 20. Annular limiting component two; 21. Magnet two; H1. First gap; H2. Second gap. Detailed Implementation

[0049] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0050] Example 1

[0051] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a disc brake includes a caliper 1 with a notch 1a at the bottom, a bracket 2 partially located within the notch 1a and having two positioning grooves 2a at the top, and a main brake pad 3 and a secondary brake pad 4 respectively located within the two positioning grooves 2a and arranged opposite each other in the front-rear direction. Specifically, the top of the caliper 1 has a window located directly above the notch 1a and connected to it. A pressure plate 5 is fixedly connected to the top of the caliper 1 in the front-rear direction, and the pressure plate 5 is located above the window. The tops of the main brake pad 3 and the secondary brake pad 4 are each connected to a spring pressure strip 6. The two spring pressure strips 6 are arranged in an upwardly convex arc shape in the left-right direction. The two ends of one spring pressure strip 6 are fixedly connected to the top of the main brake pad 3, and the two ends of the other spring pressure strip 6 are fixedly connected to the top of the secondary brake pad 4. The arched parts of the two spring pressure strips 6 abut against the lower side of the pressure plate 5. The bracket 2 and the caliper body 1 are slidably connected in a front-to-back direction. The caliper body 1 is provided with a pushing component 7 that can move back and forth. The pushing component 7 can push the main brake pad 3 toward the auxiliary brake pad 4. The front-to-back direction mentioned in this article refers to the direction of movement of the main brake pad 3 toward the auxiliary brake pad 4, not the front-to-back direction of the vehicle.

[0052] like Figure 5 , Figure 6 , Figure 8 and Figure 9 As shown, both the main brake pad 3 and the auxiliary brake pad 4 include a back plate and a friction plate fixed to one side of the back plate. The back plate is made of steel plate. The friction plates of the main brake pad 3 and the auxiliary brake pad 4 are arranged opposite to each other. The main brake pad 3 and the push assembly 7 are fixed together in the front-rear direction. The rear side of the main brake pad 3 is provided with a mating hole 3a, which is specifically set on the back plate of the main brake pad 3. The push assembly 7 has a connector 7a, and a mating head 8 is fixed on the connector 7a. The mating head 8 is located in the mating hole 3a. The outer periphery of the mating head 8 is provided with an annular limiting member 9. The annular limiting member 9 is made of flexible material and has elasticity. The outer periphery of the annular limiting member 9 abuts against the hole wall of the mating hole 3a. There is a first gap H1 between the bottom surface of the main brake pad 3 and the bottom wall of the positioning groove 2a. Specifically, the annular limiting member 9 is made of rubber material and has a circular cross-section. A buffer gap exists between the outer peripheral wall of the mating head 8 and the wall of the mating hole 3a. An annular mounting groove 8a is provided on the outer peripheral side of the mating head 8, and the annular limiting member 9 is located within the annular mounting groove 8a. There are two connecting heads 7a and two mating holes 3a. The aforementioned mating head 8 is fixed to both connecting heads 7a, and the aforementioned annular limiting member 9 is provided on the outer peripheral side of both mating heads 8. The two connecting heads 7a are at the same height and parallel to each other.

[0053] In this embodiment, as Figure 5 , Figure 8 , Figure 9 and Figure 11As shown, the pushing assembly 7 includes two parallel push rods 10 of the same height. The two push rods 10 can move synchronously in the front-back direction. Two connectors 7a protrude from the front ends of the two push rods 10. Two push plates 11 are respectively sleeved on the two connectors 7a and fixed to the main brake pads 3 in the front-back direction. Two mating heads 8 respectively position the two push plates 11 on the two connectors 7a. In practice, the clamp body 1 also has a support body 12 and a brake lever 13. The support body 12 has two helical tubes 14 passing through it in the front-back direction. Both helical tubes 14 can rotate relative to the support body 12. The two push rods 10 are respectively threaded to the inner sides of the two helical tubes 14. A return spring 15 is provided between the front side of the support body 12 and the clamp body 1. The brake lever 13 acts on the support body 12. When the brake lever 13 is activated, it forces the support body 12 to compress the return spring 15 and drive one of the helical tubes 14 to rotate. Both solenoids 14 have transmission gears fixed to their outer sides. A transition gear is rotatably mounted on the support body 12. Both transmission gears mesh with the transition gears. The push assembly 7 also includes a synchronizing rod 16. The two ends of the synchronizing rod 16 are located inside the two push plates 11 and simultaneously fitted onto the two connecting heads 7a. The front side of each push plate 11 has a positioning hole 11a. A magnet 17 is fixed inside the positioning hole 11a. Both magnets 17 are attracted to the main brake pad 3. The magnet 17 is annular. A mating head 8 is fitted onto the connecting head 7a. The rear end of the mating head 8 passes through the magnet 17 and abuts against the synchronizing rod 16. A retaining spring 18 is provided on the front side of the connecting head 7a. The rear side of the retaining spring 18 abuts against the mating head 8.

[0054] like Figure 5 , Figure 7 , Figure 8 and Figure 10As shown, the auxiliary brake pad 4 is fixed to the caliper body 1 in the front-rear direction. The front side of the auxiliary brake pad 4 has a mating hole 4a, specifically located on the back plate of the auxiliary brake pad 4. A mounting head 19 is fixed to the caliper body 1, located within the mating hole 4a. The outer periphery of the mounting head 19 has an annular and elastic annular limiting member 20, whose outer wall abuts against the wall of the mating hole 4a. A second gap H2 exists between the bottom surface of the auxiliary brake pad 4 and the bottom wall of the positioning groove 2a. Specifically, the annular limiting member 20 is made of rubber and has a circular cross-section. A buffer gap exists between the outer periphery of the mounting head 19 and the wall of the mating hole 4a. An annular mounting groove 19a is located on the outer periphery of the mounting head 19, and the annular limiting member 20 protrudes radially within the annular mounting groove 19a. There are two mating holes 4a, and two mounting heads 19 correspondingly. Both mounting heads 19 have annular limiting members 20 on their outer periphery. The clamp body 1 has mounting holes 1b on its surface facing the auxiliary brake pad 4. A magnet 21 is fixed inside each mounting hole 1b, and the magnet 21 attracts the back plate of the auxiliary brake pad 4. There are two mounting holes 1b, each stepped in shape. A magnet 21 is fixed within the larger portion of each mounting hole 1b. The magnet 21 is annular, and a portion of the mounting head 19 passes through the central hole of the magnet 21 and is fixed within the smaller portion of the mounting hole 1b (the fixing method can be an interference fit).

[0055] During braking, the brake lever 13 is forced to push the support body 12, which moves and overcomes the spring force of the return spring 15. This causes the two push rods 10 to push the main brake pad 3, which is abutting against them, to contact the brake disc via the two push plates 11. Since the position of the brake disc in the front-rear direction is fixed, and the support body 12 is continuously subjected to force, the brake disc will exert a reaction force on the caliper 1 through the support body 12. This causes the caliper 1, carrying the auxiliary brake pad 4, to move and contact the brake disc, thus clamping the brake disc and completing the braking. Simultaneously, the action of the brake lever 13 drives one of the solenoid tubes 14 to rotate, and the meshing of the two transmission gears and transition gears causes the other solenoid tube 14 to rotate as well. The rotation of the two solenoid tubes 14 drives the push rod 10 connected to them to move forward through their respective threads, thus automatically adjusting the brake clearance.

[0056] After braking ends, the brake lever 13 is no longer under force, and the support body 12 resets under the elastic force of the return spring 15, along with the solenoid 14, push rod 10, and push plate 11. However, the relative position of the push rod 10 and the solenoid 14 will not be restored. Since magnet 17 is fixed inside the two push plates 11 and magnet 17 is attracted to the back plate of the main brake pad 3, the main brake pad 3 will reset along with the two push rods 10. At the same time, the clamp body 1 will also reset, and since the clamp body 1 is attracted to the back plate of the auxiliary brake pad 4 through magnet 21, the auxiliary brake pad 4 will reset along with the clamp body 1. The reset of the main brake pad 3 and the two push rods 10 together means that the mating head 8 will not disengage from the mating hole 3a, and the annular limiting member 9 will not resist the return of the main brake pad 3. Furthermore, because the outer peripheral wall of the annular limiting member 9 abuts against the wall of the mating hole 3a, a first gap H1 exists between the bottom surface of the main brake pad 3 and the bottom wall of the positioning groove 2a. This means that the bottom surface of the main brake pad 3 and the bottom wall of the positioning groove 2a are not in contact. No contact means no resistance is generated, thereby reducing drag torque. Moreover, the annular limiting member 9 is annular and elastic, so if the main brake pad 3 moves up and down during vehicle operation, the compression deformation of the annular limiting member 9 can buffer and dampen the shock.

[0057] Similarly, the reset of the auxiliary brake pad 4 together with the caliper body 1 means that the mounting head 19 will not disengage from the mating hole 4a, and the annular retaining member 20 will not resist the return of the auxiliary brake pad 4. Furthermore, because the outer peripheral wall of the annular retaining member 20 abuts against the wall of the mating hole 4a, a second gap H2 exists between the bottom surface of the auxiliary brake pad 4 and the bottom wall of the positioning groove 2a. This means that the bottom surface of the auxiliary brake pad 4 is not in contact with the bottom wall of the positioning groove 2a, and no contact means no resistance, thereby reducing drag torque. Moreover, the annular retaining member 20 is annular and elastic, so if the auxiliary brake pad 4 moves up and down during vehicle operation, the compression deformation of the annular retaining member 20 can buffer and dampen the shock.

[0058] Example 2

[0059] This embodiment is basically the same in structure and principle as Embodiment 1, except that: in this embodiment, the pushing component 7 includes only two push rods 10 and a push plate. The connection method of the push rods 10 is the same as in Embodiment 1. The push plate is simultaneously sleeved on the two connectors 7a and fixed to the main brake pad 3 in the front-back direction. The two mating heads 8 simultaneously position the push plate on the two connectors 7a. The front side of the push plate is provided with a concave hole, and a magnet 17 is fixed in the concave hole. The magnet 17 is attracted to the main brake pad 3.

[0060] Example 3

[0061] This embodiment is basically the same as the first embodiment in terms of structure and principle, except that: in this embodiment, the wall of the mating hole 3a is provided with an annular groove 1, and the annular limiting member 9 is located inside the annular groove 1 and protrudes radially out of the annular groove 1. The wall of the mating hole 4a is provided with an annular groove 2, and the annular limiting member 20 is located inside the annular groove 2 and protrudes radially out of the annular groove 2.

[0062] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A disc brake, comprising a caliper (1) with a notch (1a) at the bottom, a bracket (2) partially located within the notch (1a) and having two positioning grooves (2a) at the top, and a main brake pad (3) and a secondary brake pad (4) respectively disposed within the two positioning grooves (2a) and arranged opposite to each other in the front-rear direction, wherein the bracket (2) and the caliper (1) are slidably connected in the front-rear direction, and the caliper (1) is provided with a pushing component (7) capable of reciprocating back and forth, characterized in that, The main brake pad (3) and the push assembly (7) are fixed in the front-rear direction. The rear side of the main brake pad (3) is provided with a mating hole (3a). The push assembly (7) has a connector (7a). A mating head (8) is fixed on the connector (7a). The mating head (8) is located in the mating hole (3a). The outer periphery of the mating head (8) is provided with an annular limiting member (9). The annular limiting member (9) is made of flexible material and has elasticity. The outer periphery of the annular limiting member (9) abuts against the hole wall of the mating hole (3a). There is a first gap (H1) between the bottom surface of the main brake pad (3) and the bottom wall of the positioning groove (2a).

2. A disc brake according to claim 1, characterized in that, The outer peripheral wall of the mating head (8) and the hole wall of the mating hole (3a) have a buffer gap. The outer peripheral side of the mating head (8) is provided with an annular mounting groove (8a). An annular limiting member (9) is located in the annular mounting groove (8a) and protrudes radially out of the annular mounting groove (8a). Alternatively, the hole wall of the mating hole (3a) is provided with an annular groove. An annular limiting member (9) is located in the annular groove and protrudes radially out of the annular groove.

3. A disc brake according to claim 1 or 2, characterized in that, The number of connectors (7a) is two, and each connector (7a) is fixed with the above-mentioned mating head (8). The outer periphery of each mating head (8) is provided with the above-mentioned annular limiting member (9).

4. A disc brake according to claim 3, characterized in that, The push assembly (7) includes two push rods (10) and two push plates (11). The two push rods (10) are at the same height and parallel to each other. The two push rods (10) can move synchronously in the front and back direction. The two connectors (7a) are respectively protruding from the front end of the two push rods (10). The two push plates (11) are respectively sleeved on the two connectors (7a) and respectively fixed to the main brake pad (3) in the front and back direction. The two mating heads (8) respectively position the two push plates (11) on the two connectors (7a).

5. A disc brake according to claim 4, characterized in that, Both push plates (11) have positioning holes (11a) on their front sides. A magnet (17) is fixed in the positioning hole (11a). Both magnets (17) are attracted to the main brake pad (3).

6. A disc brake according to claim 3, characterized in that, The pushing assembly (7) includes two push rods (10) and a push plate. The two push rods (10) are at the same height and parallel to each other. The two push rods (10) can move synchronously in the front and back direction. Two connectors (7a) are respectively protruding from the front ends of the two push rods (10). The push plate is simultaneously sleeved on the two connectors (7a) and fixed to the main brake pad (3) in the front and back direction. Two mating heads (8) simultaneously position the push plate on the two connectors (7a). The front side of the push plate is provided with a concave hole. A magnet (17) is fixed in the concave hole. The magnet (17) attracts the main brake pad (3).

7. A disc brake, comprising a caliper (1) with a notch (1a) at the bottom, a bracket (2) partially located within the notch (1a) and having two positioning grooves (2a) at the top, and a main brake pad (3) and a secondary brake pad (4) respectively disposed within the two positioning grooves (2a) and arranged opposite to each other in the front-rear direction, wherein the bracket (2) and the caliper (1) are slidably connected in the front-rear direction, and the caliper (1) is provided with a pushing component (7) capable of reciprocating back and forth, characterized in that, The auxiliary brake pad (4) is fixed to the clamp body (1) in the front-rear direction. The front side of the auxiliary brake pad (4) is provided with a mating hole 2 (4a). The clamp body (1) is fixed with an mounting head (19). The mounting head (19) is located in the mating hole 2 (4a). The outer periphery of the mounting head (19) is provided with an annular limiting member 2 (20). The annular limiting member 2 (20) is made of flexible material and has elasticity. The outer periphery of the annular limiting member 2 (20) abuts against the hole wall of the mating hole 2 (4a). There is a second gap (H2) between the bottom surface of the auxiliary brake pad (4) and the bottom wall of the positioning groove (2a).

8. A disc brake according to claim 7, characterized in that, The outer peripheral wall of the mounting head (19) and the hole wall of the mating hole (4a) have a buffer gap. The outer peripheral side of the mounting head (19) is provided with an annular mounting groove (19a). The annular limiting member (20) is located in the annular mounting groove (19a) and protrudes radially out of the annular mounting groove (19a). Alternatively, the hole wall of the mating hole (4a) is provided with an annular groove (20). The annular limiting member (20) is located in the annular groove (20) and protrudes radially out of the annular groove (20).

9. A disc brake according to claim 7 or 8, characterized in that, The clamp body (1) has a mounting hole (1b) on the surface facing the auxiliary brake pad (4). A magnet (21) is fixed in the mounting hole (1b) and the magnet (21) attracts the auxiliary brake pad (4).

10. A disc brake according to claim 9, characterized in that, The mounting hole (1b) is stepped, and the second magnet (21) is fixed in the larger part of the mounting hole (1b). The second magnet (21) is annular, and the mounting head (19) passes through the center hole of the second magnet (21) and is fixed in the smaller part of the mounting hole (1b).

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