Disc brake

Abstract

The invention provides a disc brake, and belongs to the technical field of braking. The problem that the dragging torque is increased during follow-up running of a vehicle due to buffering and damping is solved. The bottom of the caliper body is provided with a notch, the top of the bracket is provided with two positioning grooves, the main brake pad and the auxiliary brake pad are arranged in the two positioning grooves respectively and oppositely arranged in the front-back direction, a pushing assembly is arranged on the caliper body, the main brake pad and the pushing assembly are fixed in the front-back direction, the rear side of the main brake pad is provided with a first matching hole, and a second matching hole is formed in the rear side of the auxiliary brake pad. The pushing assembly is provided with a connector, a matching head is fixed to the connector and located in the first matching hole, a first annular limiting piece is arranged on the peripheral side of the matching head, the first annular limiting piece is made of flexible materials and has elasticity, and the peripheral wall of the first annular limiting piece abuts against the hole wall of the first matching hole. A first gap is formed between the bottom face of the main brake lining block and the groove bottom wall of the locating groove where the main brake lining block is located. The damping device has the advantages that the damping function is guaranteed, and meanwhile dragging torque is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of braking and relates to a disc brake. Background Art

[0002] Disc brakes are a common type of brake used on passenger and truck wheels. They achieve braking by locking a rotating brake disc. A disc brake consists of a caliper, a bracket, a primary brake pad, and a secondary brake pad. The bracket is fixed to the vehicle. The bottom of the caliper has a notch, into which the bracket partially rests. The primary and secondary brake pads are also located within the caliper. The top of the bracket has two locating grooves, into which the primary and secondary brake pads rest. The caliper also houses a pusher assembly to move the primary brake pads. The primary and secondary brake pads are located on either side of the brake disc. During braking, the pusher assembly is driven to push the primary brake pad into contact with the brake disc. The brake disc remains fixed, and the pusher assembly is continuously driven. This creates a reaction force on the caliper, causing it to float. The caliper then pulls the secondary brake pad into contact with the disc, clamping the primary and secondary brake pads together and locking the disc. After braking, the push assembly resets, and the primary and secondary brake pads reset under the centrifugal force of the brake disc's rotation. The basic structure and operating principle of the disc brake can be specifically referred to in the floating caliper radial dual-push rod pneumatic disc brake disclosed in Application No. 201710372746.9.

[0003] When a vehicle is jolted, the brake pads bounce up and down, creating a rigid collision between the pads and the bottom wall of the positioning groove, producing a constant "clicking" sound that seriously affects passenger comfort. To address this issue, Chinese patent application number 201320062116.9 discloses a friction pad comprising a friction plate and a backing plate. The friction plate and backing plate are fixedly connected. The backing plate has a drilled hole on the side that contacts the bracket, and a silencer pad is fixed within the drilled hole. The surface of the silencer pad protrudes from the backing plate. The silencer pad has high toughness, flexibility, high and low temperature resistance, and shockproof properties. It acts as a buffer. When the friction pad is quickly pressed back into the bracket, the silencer pad prevents direct collision between the friction plate and the bracket, preventing the "clicking" sound from being produced when the friction block is pressed back.

[0004] The presence of the silencer pad means it must be in contact with the bracket. Since the silencer pad is made of rubber, this will obviously increase the sliding resistance of the friction pad during its return, preventing it from returning to its original position in a stable and timely manner after braking. This means that the friction pad may still be attached to the brake disc after braking. This will cause residual braking torque during subsequent driving, thereby creating a drag torque, which increases the vehicle's energy consumption. In other words, while the use of the silencer pad can provide cushioning and shock absorption, it will hinder the return of the main brake pad, resulting in an increase in the drag torque during subsequent driving.

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

[0006] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a disc brake that solves the problem of increased drag torque during subsequent driving of the vehicle caused by buffering and shock absorption.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A disc brake comprises a caliper body with a notch at the bottom, a bracket partially located in the notch and provided with two positioning grooves at the top, and a primary brake pad and a secondary brake pad respectively arranged in the two positioning grooves and arranged opposite to each other in the front-rear direction. The bracket is connected to the caliper body in a front-rear sliding manner, and the caliper body is provided with a pushing assembly that can move back and forth. It is characterized in that the primary brake pad and the pushing assembly are fixed in the front-rear direction, a matching hole is provided on the rear side of the main brake pad, the pushing assembly has a connecting head, a matching head is fixed on the connecting head, the matching head is located in the matching hole, an annular limit piece is provided on the outer peripheral side of the matching head, the annular limit piece is made of flexible material and has elasticity, the outer peripheral wall of the annular limit piece abuts against the hole wall of the matching hole, and a first gap is provided between the bottom surface of the main brake pad and the bottom wall of the positioning groove.

[0009] During braking, the pusher assembly is driven forward, bringing the primary brake pad into contact with the brake disc. Since the brake disc's front-to-back position remains fixed, and the pusher assembly is continuously driven, the disc exerts a reaction force on the caliper through the pusher assembly, causing the caliper to move backward with the secondary brake pad until it contacts the disc, clamping the disc and achieving braking. After braking, the pusher assembly is no longer driven and resets. Since the primary brake pad and pusher assembly are fixed in the front-to-back direction, the primary brake pad resets along with the pusher assembly.

[0010] Because a mating hole (I) is provided on the rear side of the main brake pad and a connector is provided on the push assembly, a mating head is fixed to the connector. The mating head is located within the mating hole (I), and an annular stopper (I) is provided on the outer periphery of the mating head. The outer periphery of the annular stopper (I) abuts against the wall of the mating hole (I). This allows the main brake pad to be suspended on the push assembly, thereby creating a first gap between the bottom surface of the main brake pad and the bottom wall of the positioning groove in which it is located. This means that the bottom surface of the main brake pad and the bottom wall of the positioning groove in which it is located do not contact each other. This lack of contact means that the bracket will not resist the main brake pad during its return. This reduces sliding resistance during the return of the main brake pad, allowing the main brake pad to return quickly and stably, thereby reducing or even eliminating the brake drag torque experienced by the vehicle during subsequent driving. The main brake pad returns together with the push assembly, which means that the mating head cannot be disengaged from the mating hole (I), and the annular stopper (I) will not resist the return of the main brake pad. Furthermore, the annular stopper is annular and elastic. Thus, if the main brake pad moves up and down during vehicle operation, the compression deformation of the annular stopper provides a cushioning and shock-absorbing effect. In other words, this arrangement allows the disc brake to reduce drag torque while maintaining its cushioning and shock-absorbing function.

[0011] In the above-mentioned disc brake, a buffer gap is provided between the outer peripheral wall of the mating head and the hole wall of the mating hole, an annular mounting groove 1 is provided on the outer peripheral side of the mating head, an annular limiter 1 is located in the annular mounting groove 1 and radially protrudes outside the annular mounting groove 1, or an annular groove 1 is provided on the hole wall of the mating hole, an annular limiter 1 is located in the annular groove 1 and radially protrudes outside the annular groove 1.

[0012] A buffer gap is provided between the outer peripheral wall of the mating head and the wall of the mating hole 1, allowing the main brake pad to float up and down relative to the push assembly when the vehicle is jolted. On this basis, an annular mounting groove 1 is provided on the outer peripheral side of the mating head. An annular retaining member 1 is located within the annular mounting groove 1 and radially protrudes from the annular mounting groove 1. The annular mounting groove 1 can provide a positioning function for the annular retaining member 1, while the annular retaining member 1 radially protrudes from the annular mounting groove 1, ensuring that the annular retaining member 1 can function when the main brake pad floats up and down, preventing the annular retaining member 1 from shifting during jolting vehicle travel, which could cause the bottom surface of the main brake pad to contact the bottom wall of the positioning groove, or otherwise affect the buffering and shock absorption function, thereby ensuring structural stability.

[0013] In addition to the above-mentioned arrangement, an annular groove 1 is similarly provided on the hole wall of the mating hole 1, and an annular limit member 1 is located in the annular groove 1 and radially protrudes from the annular groove 1. The annular groove 1 can also form a positioning effect on the annular limit member 1, and the annular limit member 1 radially protrudes from the annular groove 1, thereby ensuring that the annular limit member 1 can take effect when the main brake pad floats up and down, thereby preventing the annular limit member 1 from shifting during the bumpy driving of the vehicle, causing the bottom surface of the main brake pad to contact the bottom wall of the positioning groove or causing the buffering and shock absorption function to be affected, thereby ensuring the stability of the structure.

[0014] In the above-mentioned disc brake, there are two connecting heads, the mating heads are fixed on both connecting heads, and the annular limiting member is provided on the outer circumference of both mating heads.

[0015] The above arrangement ensures that the main brake pad will not deflect around the mating head, causing the local bottom surface to contact the bottom wall of the positioning groove, further ensuring the reliability of the disc brake in reducing the drag torque.

[0016] In the above-mentioned disc brake, the pushing assembly includes two push rods and two push plates. 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 rear directions. Two connecting heads are respectively protruding from the front ends of the two push rods. The two push plates are respectively sleeved on the two connecting heads and are respectively fixed to the main brake pads in the front and rear directions. The two mating heads respectively position the two push plates on the two connecting heads.

[0017] Specifically, during braking, the two push rods are driven forward simultaneously, pushing the primary brake pads forward until they contact the brake discs via the two push discs. Two connectors protrude from the front ends of the two push rods, and the two push discs are respectively sleeved onto the connectors. The two push discs are positioned on the connectors by two mating heads, which also serve to position the push discs. Because the push discs are fixed to the primary brake pads in the front-to-back direction and the push discs are positioned on the connectors by the mating heads, when the two push rods are reset, they bring the push discs and the primary brake pads back to their original position.

[0018] The connecting head protrudes from the front end of the push rod, which is equivalent to extending the push rod, so that the main brake pad can be hung on the push rod and form a first gap between it and the bottom wall of the positioning groove to reduce the drag torque when returning.

[0019] In the above-mentioned disc brake, the front sides of the two push discs are each provided with a positioning hole, in which a first magnet is fixed, and the two first magnets are attracted to the main brake pad.

[0020] Magnet 1 attracts the primary brake pad, securing it to the push assembly in the forward and backward directions. This allows the push assembly to return the primary brake pad along with it, preventing the mating head from being disengaged from mating hole 1 and reducing drag torque. Furthermore, by providing a positioning hole on the front side of the push plate, Magnet 1 is directly secured within the positioning hole, effectively utilizing the push plate and eliminating the need for a separate component for mounting Magnet 1.

[0021] In the above-mentioned disc brake, 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. The two push rods can move synchronously in the front and rear directions. 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 rear directions. The two mating heads simultaneously position the push plate on the two connecting heads. A concave hole is provided on the front side of the push plate. A magnet 1 is fixed in the concave hole, and the magnet 1 is attracted to the main brake pad.

[0022] Specifically, during braking, the two push rods are driven forward simultaneously, pushing the primary brake pad forward into contact with the brake disc via the push plate. Two connectors protrude from the front ends of the two push rods, and the push plate is simultaneously sleeved onto the connectors. Two mating heads simultaneously position the push plate on the connectors, effectively positioning the push plate. Because the push plate and the primary brake pad are fixed in the front-to-back direction and the mating heads position the push plate on the connectors, the push rods return to their original position, bringing the push plate and the primary brake pad with them. The connector protrudes from the front ends of the push rods, effectively extending the push rods. This allows the primary brake pad to be hooked onto the push rods, creating a first gap between the push rods and the bottom wall of the positioning slot, thereby reducing drag torque during return.

[0023] By attracting the main brake pad with magnet 1, the main brake pad can be fixed together with the pushing assembly in the front-to-back direction, so that when the pushing assembly is reset, the main brake pad can be reset together, eliminating the situation where the mating head is separated from the mating hole 1 and reducing the drag torque.

[0024] A disc brake comprises a caliper body with a notch at the bottom, a bracket partially located in the notch and provided with two positioning grooves at the top, and a primary brake pad and a secondary brake pad respectively arranged in the two positioning grooves and arranged opposite to each other in the front-to-back direction. The bracket is connected to the caliper body in a front-to-back sliding manner, and the caliper body is provided with a pushing assembly that can move back and forth. It is characterized in that the secondary brake pad is fixed to the caliper body in the front-to-back direction, a second matching hole is provided on the front side of the secondary brake pad, a mounting head is fixed on the caliper body, the mounting head is located in the second matching hole, and a second annular limiter is provided on the outer peripheral side of the mounting head. The second annular limiter is made of flexible material and has elasticity. The outer peripheral wall of the second annular limiter abuts against the hole wall of the second matching hole so that a second gap is provided between the bottom surface of the secondary brake pad and the bottom wall of the positioning groove.

[0025] During braking, the pusher assembly is driven forward, bringing the primary brake pad into contact with the brake disc. Since the brake disc's front-to-back position remains fixed, and the pusher assembly is continuously driven, the disc exerts a reaction force on the caliper through the pusher assembly, causing the caliper to move backward with the secondary brake pad until it contacts the disc, clamping the disc and achieving braking. After braking, the pusher assembly is no longer driven and resets. Since the primary brake pad and pusher assembly are fixed in the front-to-back direction, the primary brake pad resets along with the pusher assembly. Simultaneously, the caliper also resets, and since the caliper is attracted to the secondary brake pad via magnet 2, the secondary brake pad resets along with the caliper.

[0026] Because the secondary brake pad is provided with a second mating hole on the front side and a mounting head on the caliper body, the mounting head is positioned within the second mating hole and a second annular stopper is provided on the outer periphery of the mounting head. The outer periphery of the second annular stopper abuts against the wall of the second mating hole, 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 in which it is located. This means that the bottom surface of the secondary brake pad and the bottom wall of the positioning groove in which it is located do not contact each other. This lack of contact means that the bracket will not resist the secondary brake pad during its return. This reduces sliding resistance during the return of the secondary brake pad, allowing the secondary brake pad to return quickly and stably, thereby reducing or even eliminating brake drag torque during subsequent driving. The simultaneous return of the secondary brake pad and the caliper body means that the mounting head cannot be disengaged from the second mating hole, and the second annular stopper does not resist the return of the secondary brake pad. Furthermore, the annular stopper is annular and elastic. Thus, if the auxiliary brake pad moves up and down during vehicle operation, the compressed deformation of the annular stopper provides a buffering and shock-absorbing effect. In other words, this arrangement allows the disc brake to reduce drag torque while maintaining its buffering and shock-absorbing function.

[0027] In the above-mentioned disc brake, there is a buffer gap between the outer peripheral wall of the mounting head and the hole wall of the matching hole 2, and the outer peripheral side of the mounting head is provided with an annular mounting groove 2, and the annular limiter 2 is located in the annular mounting groove 2 and protrudes radially outside the annular mounting groove 2, or the hole wall of the matching hole 2 is provided with an annular groove 2, and the annular limiter 2 is located in the annular groove 2 and protrudes radially outside the annular groove 2.

[0028] A buffer gap is provided between the outer peripheral wall of the mounting head and the wall of the second mating hole, allowing the auxiliary brake pad to float up and down relative to the caliper body when the vehicle is jolted. Furthermore, a second annular mounting groove is provided on the outer peripheral side of the mounting head. A second annular retaining member is positioned within the second annular mounting groove and radially protrudes from the second annular mounting groove. The second annular mounting groove positions the second annular retaining member, while the second annular retaining member radially protrudes from the second annular mounting groove, ensuring that the second annular retaining member can function when the auxiliary brake pad floats up and down. This prevents the second annular retaining member from shifting during jolting driving, which could cause the bottom surface of the auxiliary brake pad to contact the bottom wall of the positioning groove, or otherwise affect the buffering and shock-absorbing function, thereby ensuring structural stability.

[0029] In addition to the above-mentioned arrangement, similarly, an annular groove 2 is provided on the hole wall of the mating hole 2, and the annular limit member 2 is located in the annular groove 2 and radially protrudes from the annular groove 2. The annular groove 2 can also form a positioning effect on the annular limit member 2, and the annular limit member 2 protrudes radially from the annular groove 2, thereby ensuring that the annular limit member 2 can take effect when the auxiliary brake pad floats up and down, thereby preventing the annular limit member 2 from shifting during the bumpy driving of the vehicle, causing the bottom surface of the auxiliary brake pad to contact the bottom wall of the positioning groove or causing the buffering and shock absorption function to be affected, thereby ensuring the stability of the structure.

[0030] In the above-mentioned disc brake, a mounting hole is provided on the surface of the caliper body facing the auxiliary brake pad, and a second magnet is fixed in the mounting hole, and the second magnet is attracted to the auxiliary brake pad.

[0031] The second magnet is attracted to the primary brake pad, so that the caliper body and the secondary brake pad are fixed together in the front-to-back direction, so that when the caliper body is reset, the secondary brake pad can be reset together, eliminating the situation where the mounting head is separated from the second matching hole and reducing the drag torque.

[0032] In the above-mentioned disc brake, the mounting hole is stepped, the second magnet is fixed in the larger part of the mounting hole, the second magnet is annular, and the mounting head part passes through the center hole of the second magnet and is fixed in the smaller part of the mounting hole.

[0033] Through the above arrangement, the second magnet and the mounting head can be fixed on the clamp body by means of the same mounting hole without interfering with each other.

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

[0035] 1. By providing a mating hole (I) on the rear side of the main brake pad and a connecting head on the push assembly, a mating head is fixed to the connecting head, the mating head is located in the mating hole (I), and an annular stopper (I) is provided on the outer periphery of the mating head. The outer periphery of the annular stopper (I) abuts against the wall of the mating hole (I). This allows the main brake pad to be suspended on the push assembly, thereby creating a first gap between the bottom surface of the main brake pad and the bottom wall of the positioning groove in which it is located. This prevents the bracket from generating resistance to the main brake pad during reset, thereby reducing sliding resistance during return, allowing the main brake pad to return quickly and stably, thereby reducing or even eliminating the brake drag torque experienced by the vehicle during subsequent driving. Furthermore, the annular stopper (I) is annular and elastic, and its compression deformation ensures the required cushioning and shock absorption function.

[0036] 2. By providing a second mating hole on the front side of the secondary brake pad and a mounting head on the caliper body, and disposing a second annular stopper on the outer periphery of the mounting head, the outer periphery of the second annular stopper abuts against the wall of the second mating hole, thereby 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 in which it is located. This prevents the bracket from generating resistance to the secondary brake pad during its reset, thereby reducing sliding resistance during the return of the secondary brake pad and enabling it to return quickly and stably, thereby reducing or even eliminating the brake drag torque experienced by the vehicle during subsequent driving. Furthermore, the second annular stopper is annular and elastic, and its compression deformation ensures the required cushioning and shock absorption function. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0039] Figure 3 This is a partial exploded 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 Cross-sectional view along the AA axis.

[0042] Figure 6 yes Figure 5 A partial enlarged view of the middle mating head.

[0043] Figure 7 yes Figure 5 A partial enlarged view of the middle mounting head.

[0044] Figure 8 yes Figure 4 Cross-sectional view along the BB direction.

[0045] Figure 9 yes Figure 8 A partial enlarged view of the middle main brake pad.

[0046] Figure 10 yes Figure 8 A partial enlarged view of the middle auxiliary brake pad.

[0047] Figure 11 is a schematic diagram of the push assembly (minus the mating head).

[0048] In the figure, 1, caliper body; 1a, notch; 1b, mounting hole; 2, bracket; 2a, positioning groove; 3, main brake pad; 3a, matching hole 1; 4, auxiliary brake pad; 4a, matching hole 2; 5, pressure plate; 6, spring strip; 7, pushing assembly; 7a, connecting head; 8, matching head; 8a, annular mounting groove 1; 9, annular limiter 1; 10, push rod; 11, push plate; 11a, positioning hole; 12, support body; 13, brake lever; 14, solenoid; 15, return spring; 16, synchronization rod; 17, magnet 1; 18, retaining spring; 19, mounting head; 19a, annular mounting groove 2; 20, annular limiter 2; 21, magnet 2; H1, first gap; H2, second gap. DETAILED DESCRIPTION

[0049] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but 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 comprises a caliper body 1 with a notch 1a at the bottom, a bracket 2 partially located in the notch 1a and provided with two positioning grooves 2a at the top, and a main brake pad 3 and an auxiliary brake pad 4 respectively arranged in the two positioning grooves 2a and arranged opposite to each other in the front-to-back direction. Specifically, a window is provided on the top of the caliper body 1, the window is located directly above the notch 1a and the two are connected, a pressure plate 5 is fixedly connected to the top of the caliper body 1 along the front-to-back direction, the pressure plate 5 is located above the window, and the tops of the main brake pad 3 and the auxiliary brake pad 4 are both connected with a spring strip 6, and the two spring strips 6 are arranged in an upward convex arc along the left and right directions, the two ends of one spring strip 6 are respectively fixedly connected to the top of the main brake pad 3, and the two ends of the other spring strip 6 are respectively fixedly connected to the top of the auxiliary brake pad 4, and the arched parts of the two spring strips 6 are both against the lower side of the pressure plate 5. Bracket 2 is connected to caliper body 1 for a forward and backward sliding motion. Caliper body 1 is provided with a reciprocating pusher assembly 7, which pushes primary brake pad 3 toward secondary brake pad 4. The forward and backward direction mentioned in this article refers to the direction of movement of primary brake pad 3 toward secondary brake pad 4, not the forward and backward direction of the vehicle.

[0052] like Figure 5 、 Figure 6 、 Figure 8 and Figure 9 As shown, both the primary brake pad 3 and the secondary brake pad 4 include a back plate and a friction lining secured to one side of the back plate. The back plate is made of steel, and the friction lining of the primary brake pad 3 is positioned opposite the friction lining of the secondary brake pad 4. The primary brake pad 3 is fixed to a pusher assembly 7 along the front-to-back direction. A mating hole 3a is defined on the rear side of the primary brake pad 3. The mating hole 3a is specifically provided on the back plate of the primary brake pad 3. The pusher assembly 7 includes a connector 7a, to which a mating head 8 is secured. The mating head 8 is positioned within the mating hole 3a. An annular stopper 9 is provided on the outer periphery of the mating head 8. The annular stopper 9 is made of a flexible and elastic material. The outer periphery of the annular stopper 9 abuts against the wall of the mating hole 3a. A first gap H1 is defined between the bottom surface of the primary brake pad 3 and the bottom wall of the positioning groove 2a in which it is located. Specifically, the annular stopper 9 is made of rubber and has a circular cross-section. A buffer gap is provided between the outer circumference of the mating head 8 and the wall of the mating hole 3a. An annular mounting groove 8a is provided on the outer circumference of the mating head 8, and the annular stopper 9 is located within the annular mounting groove 8a. There are two connectors 7a and two mating holes 3a. The mating heads 8 are fixed to both connectors 7a, and the annular stopper 9 is provided on the outer circumference of both mating heads 8. The two connectors 7a are at the same height and are parallel.

[0053] In this embodiment, if 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-to-back direction. Two connectors 7a are respectively protruding 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-to-back direction. Two mating heads 8 respectively position the two push plates 11 on the two connectors 7a. In practice, the caliper body 1 is also provided with a support body 12 and a brake lever 13. The support body 12 is provided with two solenoids 14 in the front-to-back direction. Both solenoids 14 can rotate relative to the support body 12. The two push rods 10 are respectively threadedly connected to the inner sides of the two solenoids 14. A return spring 15 is provided between the front side of the support body 12 and the caliper body 1. The brake lever 13 acts on the support body 12. When the brake lever 13 is actuated, it forces the support body 12 to compress the return spring 15 and drive one of the solenoids 14 to rotate. Transmission gears are fixed to the outsides of both solenoids 14. A transition gear is rotatably mounted on the support body 12, and both transmission gears mesh with the transition gears. The push assembly 7 also includes a synchronization rod 16, with its ends positioned within the two push plates 11 and simultaneously positioned over the two connectors 7a. Positioning holes 11a are defined on the front sides of both push plates 11. Magnets 17 are secured within these holes and attract the primary brake pads 3. Magnets 17 are annular in shape, and the mating head 8 is sheathed over the connector 7a. The rear end of the mating head 8 passes through the magnets 17 and rests against the synchronization rod 16. A retaining spring 18 is provided on the front side of the connector 7a, with the rear side of the retaining spring 18 resting 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 along the front-to-back direction. A second mating hole 4a is defined on the front side of the auxiliary brake pad 4. Specifically, the second mating hole 4a is located on the back plate of the auxiliary brake pad 4. A mounting head 19 is fixed to the caliper body 1 and positioned within the second mating hole 4a. An annular, elastic retaining member 20 is provided on the outer periphery of the mounting head 19. The outer periphery of the retaining member 20 abuts against the wall of the second mating hole 4a, creating a second gap H2 between the bottom surface of the auxiliary brake pad 4 and the bottom wall of the positioning groove 2a in which it is located. Specifically, the second retaining member 20 is made of rubber and has a circular cross-section. A buffer gap is defined between the outer periphery of the mounting head 19 and the wall of the second mating hole 4a. An annular mounting groove 19a is defined on the outer periphery of the mounting head 19. The second retaining member 20 is positioned within the annular mounting groove 19a and radially protrudes therefrom. There are two matching holes 4a, and two mounting heads 19, respectively. The outer circumference of each mounting head 19 is provided with the aforementioned annular stopper 20. The surface of the caliper body 1 facing the auxiliary brake pad 4 is provided with a mounting hole 1b. A magnet 21 is fixed within the mounting hole 1b, and the magnet 21 is attracted to the back plate of the auxiliary brake pad 4. There are two mounting holes 1b, each of which is stepped. The larger portion of each mounting hole 1b is fixed with the aforementioned magnet 21, which is annular in shape. The mounting head 19 partially passes through the center hole of the magnet 21 and is fixed within the smaller portion of the mounting hole 1b (the fixing method may be an interference fit).

[0055] During braking, the brake lever 13 is subjected to force, pushing the support body 12. This force, which moves and overcomes the force of the return spring 15, causes the two push rods 10, via the two push discs 11, to push the primary brake pad 3 against it, into contact with the brake disc. Because the brake disc's position in the fore-aft direction is fixed, and the support body 12 is continuously subjected to force, the brake disc exerts a reaction force on the caliper body 1 through the support body 12, causing the caliper body 1 and the secondary brake pad 4 to move into contact with the brake disc, thus clamping the brake disc and achieving braking. Simultaneously, the movement of the brake lever 13 drives one of the solenoids 14 to rotate. The meshing of the two transmission gears and the transition gear also causes the other solenoid 14 to rotate. The rotation of the two solenoids 14 drives the push rods 10 connected to them forward through their respective threads, thus automatically adjusting the brake clearance.

[0056] After braking is complete, the brake lever 13 is no longer under force, and the support body 12 is reset by the elastic force of the return spring 15, returning the solenoid 14, push rod 10, and push plate 11 to their original positions. However, the relative positions of the push rod 10 and solenoid 14 remain unchanged. Because magnets 17 are fixed to the two push plates 11 and attract the backplate of the primary brake pad 3, the primary brake pad 3 is reset along with the two push rods 10. Simultaneously, the caliper body 1 is also reset, and because the caliper body 1 is attracted to the backplate of the secondary brake pad 4 via magnet 21, the secondary brake pad 4 is reset along with the caliper body 1. The simultaneous reset of the primary brake pad 3 and the two push rods 10 means that the mating head 8 cannot be disengaged from the mating hole 1 a, and the annular stopper 1 9 does not resist the return of the primary brake pad 3. Furthermore, because the outer circumferential wall of the annular stopper 9 abuts 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 in which it is located. This means that there is no contact between the bottom surface of the main brake pad 3 and the bottom wall of the positioning groove 2a. This lack of contact means no resistance is generated, thereby reducing drag torque. Furthermore, the annular stopper 9 is annular and elastic. Therefore, if the main brake pad 3 moves up and down during vehicle operation, the compression deformation of the annular stopper 9 can provide a cushioning effect.

[0057] Similarly, the auxiliary brake pad 4 returns to its original position along with the caliper body 1, meaning the mounting head 19 will not disengage from the second mating hole 4a. Furthermore, the second annular stopper 20 will not resist the return of the auxiliary brake pad 4. Furthermore, because the outer peripheral wall of the second annular stopper 20 abuts against the wall of the second 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 there is no contact between the bottom surface of the auxiliary brake pad 4 and the bottom wall of the positioning groove 2a. This lack of contact means no resistance, thereby reducing drag torque. Furthermore, the second annular stopper 20 is annular and elastic. This allows the compressed deformation of the second annular stopper 20 to provide a cushioning effect in the event of up and down movement of the auxiliary brake pad 4 during vehicle operation.

[0058] Example 2

[0059] This embodiment has essentially the same structure and principle as the first embodiment, differing in that the push assembly 7 in this embodiment comprises only two push rods 10 and a push plate. The push rods 10 are connected in the same manner as in the first embodiment. The push plate is simultaneously sleeved onto two connectors 7a and secured to the primary brake pad 3 in the front-to-back direction. Two mating heads 8 simultaneously position the push plate on the two connectors 7a. A recessed hole is provided on the front side of the push plate, within which a magnet 17 is secured, attracting the primary brake pad 3.

[0060] Example 3

[0061] This embodiment has substantially the same structure and principle as the first embodiment, with the following differences: In this embodiment, the wall of the first mating hole 3a is provided with an annular groove 1, and the first annular stopper 9 is located within the first annular groove and radially protrudes outside the first annular groove. The wall of the second mating hole 4a is provided with an annular groove 2, and the second annular stopper 20 is located within the second annular groove and radially protrudes outside the second annular groove.

[0062] 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 of the appended claims.

Claims

1. A disc brake, comprising a caliper body (1) having a notch (1a) at the bottom, a bracket (2) partially located in the notch (1a) and having two positioning grooves (2a) at the top, and a primary brake pad (3) and an auxiliary brake pad (4) respectively located in the two positioning grooves (2a) and arranged opposite to each other in the front-to-back direction, wherein the bracket (2) is connected to the caliper body (1) in a front-to-back sliding manner, and a pushing assembly (7) capable of reciprocating forward and backward is provided on the caliper body (1), characterized in that: The main brake pad (3) and the pushing assembly (7) are fixed in the front-to-back direction. A matching hole (3a) is provided on the rear side of the main brake pad (3). The pushing assembly (7) has a connecting head (7a). A matching head (8) is fixed on the connecting head (7a). The matching head (8) is located in the matching hole (3a). An annular limiting member (9) is provided on the outer peripheral side of the matching head (8). The annular limiting member (9) is made of a flexible material and has elasticity. The outer peripheral wall of the annular limiting member (9) is in contact with the hole wall of the matching hole (3a). A first gap (H1) is provided between the bottom surface of the main brake pad (3) and the bottom wall of the positioning groove (2a) in which it is located.

2. A disc brake according to claim 1, characterized in that: There is a buffer gap between the outer peripheral wall of the mating head (8) and the hole wall of the mating hole (3a), and an annular mounting groove (8a) is provided on the outer peripheral side of the mating head (8), and an annular limiting member (9) is located in the annular mounting groove (8a) and radially protrudes from the annular mounting groove (8a), or an annular groove (1) is provided on the hole wall of the mating hole (3a), and an annular limiting member (9) is located in the annular groove (1) and radially protrudes from the annular groove (1).

3. A disc brake according to claim 1 or 2, characterized in that: There are two connecting heads (7a), and the above-mentioned mating heads (8) are fixed along the two connecting heads (7a). The outer peripheral sides of the two mating heads (8) are provided with the above-mentioned annular limiting member (9).

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

5. A disc brake according to claim 4, characterized in that: The front sides of the two push plates (11) are both provided with positioning holes (11a), and magnets (17) are fixed in the positioning holes (11a). The two magnets (17) are attracted to the main brake pads (3).

6. The 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 of the same height and are parallel to each other. The two push rods (10) can move synchronously in the front-back direction. Two connecting heads (7a) are respectively protruding from the front ends of the two push rods (10). The push plate is simultaneously sleeved on the two connecting heads (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 connecting heads (7a). A concave hole is provided on the front side of the push plate. A magnet (17) is fixed in the concave hole. The magnet (17) is attracted to the main brake pad (3).

7. A disc brake, comprising a caliper (1) having a notch (1a) at the bottom, a bracket (2) partially located in the notch (1a) and having two positioning grooves (2a) at the top, and a primary brake pad (3) and an auxiliary brake pad (4) respectively located in the two positioning grooves (2a) and arranged opposite to each other in the front-to-back direction, wherein the bracket (2) is connected to the caliper (1) in a front-to-back sliding manner, and a pushing assembly (7) capable of reciprocating forward and backward is provided on the caliper (1), characterized in that: The auxiliary brake pad (4) is fixed to the caliper body (1) along the front-to-back direction. A second matching hole (4a) is provided on the front side of the auxiliary brake pad (4). A mounting head (19) is fixed on the caliper body (1). The mounting head (19) is located in the second matching hole (4a). An annular limiting member (20) is provided on the outer peripheral side of the mounting head (19). The annular limiting member (20) is made of a flexible material and has elasticity. The outer peripheral wall of the annular limiting member (20) abuts against the hole wall of the second matching hole (4a). A second gap (H2) is provided between the bottom surface of the auxiliary brake pad (4) and the bottom wall of the positioning groove (2a) in which it is located.

8. The disc brake according to claim 7, characterized in that: There is a buffer gap between the outer peripheral wall of the mounting head (19) and the hole wall of the matching hole (4a), and an annular mounting groove (19a) is provided on the outer peripheral side of the mounting head (19), and the annular limiting member (20) is located in the annular mounting groove (19a) and radially protrudes from the outside of the annular mounting groove (19a), or the hole wall of the matching hole (4a) is provided with an annular groove (2), and the annular limiting member (20) is located in the annular groove (2) and radially protrudes from the outside of the annular groove (2).

9. A disc brake according to claim 7 or 8, characterized in that: The caliper body (1) is provided with a mounting hole (1b) on the surface facing the auxiliary brake pad (4), and a second magnet (21) is fixed in the mounting hole (1b), and the second magnet (21) and the auxiliary brake pad (4) are attracted to each other.

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

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