阅读说明：本技术 制动器的降拖滞回位机构及包括其的制动器 (Dragging-reduction return mechanism of brake and brake comprising same ) 是由 王荣 袁建成 张志明 董振 于 2021-08-06 设计创作，主要内容包括：本申请公开了一种制动器的降拖滞回位机构及包括其的制动器,制动器的降拖滞回位机构包括：弹性衬套,所述弹性衬套包括相对设置的第一连接端和第二连接端,所述第一连接端和所述第二连接端分别用于所述制动器的与导向销和卡钳支架连接；至少一个回位弹簧,每个所述回位弹簧套设在所述弹性衬套上,且能够沿着所述弹性衬套的轴向方向伸缩；所述回位弹簧采用弹簧钢制作而成。本申请公开了一种制动器的降拖滞回位机构及包括其的制动器,来解决现有的制动器提供的回位效果、能力不理想的问题。(The application discloses stopper fall and drag return mechanism and include its stopper, the stopper fall and drag return mechanism and include: the brake comprises an elastic bushing, a brake body and a brake lining, wherein the elastic bushing comprises a first connecting end and a second connecting end which are oppositely arranged, and the first connecting end and the second connecting end are respectively used for connecting the brake with a guide pin and a caliper support; each return spring is sleeved on the elastic bushing and can stretch along the axial direction of the elastic bushing; the return spring is made of spring steel. The application discloses brake falls drags return mechanism and includes its stopper, solves the not ideal problem of return effect, ability that current stopper provided.)

1. A drag reduction return mechanism for a brake, comprising:

the brake comprises an elastic bushing, a brake body and a brake lining, wherein the elastic bushing comprises a first connecting end and a second connecting end which are oppositely arranged, and the first connecting end and the second connecting end are respectively used for being connected with a guide pin and a caliper bracket of the brake;

each return spring is sleeved on the elastic bushing and can stretch along the axial direction of the elastic bushing; the return spring is made of spring steel.

2. The drag reduction return mechanism for a brake of claim 1, wherein:

the elastic bushing comprises a center pillar and a containing cavity arranged along the circumferential direction of the center pillar, the first connecting end and the second connecting end are respectively arranged at two opposite ends of the center pillar, and each return spring is at least partially located in the containing cavity.

3. A drag reduction return mechanism for a brake as claimed in claim 2, wherein:

the accommodating cavity extends spirally in the axial direction of the center pillar.

4. A drag reduction return mechanism for a brake according to claim 2 or 3, wherein:

a first buffer cavity is arranged between the accommodating cavity and the first connecting end, and/or a second buffer cavity is arranged between the accommodating cavity and the second connecting end.

5. A drag reduction return mechanism for a brake according to any one of claims 1 to 3, wherein:

the second connecting end is connected with the caliper support in a lifting mode.

6. The drag reduction return mechanism for a brake of claim 5, wherein:

the end face of the first connecting end is provided with a guide pin hole, and the guide pin is connected with the guide pin hole in a sliding mode.

7. A drag reduction return mechanism for a brake according to any one of claims 1 to 3, wherein:

the elastic bushing and the return spring are manufactured in an integrated mode.

8. A brake comprising at least one drag reduction return mechanism of a brake as claimed in any one of claims 1 to 7.

9. The brake of claim 8, further comprising:

the brake caliper comprises a caliper shell, caliper supports are arranged at two opposite ends of the caliper shell, guide pins are arranged at two opposite ends of the caliper shell, and a brake dragging return mechanism is connected between the caliper support and the guide pins which are arranged oppositely.

10. The brake of claim 9, wherein:

the brake calipers further comprise calipers bodies, and the two calipers supports are respectively arranged at two opposite ends of the calipers bodies; the caliper shell covers the caliper body and can move to and fro relative to the caliper body.

Technical Field

The application relates to the technical field of vehicle manufacturing, in particular to a dragging return mechanism of a brake and a brake comprising the dragging return mechanism.

Background

In the current automobile market, the dragging torque of brake calipers of most passenger cars is usually not more than 5 Nm, and along with the high-speed development of the electromotion of the automobile industry, the requirement on the dragging torque of the brake calipers is higher and higher for further solving the problem of the endurance mileage of a pure electric vehicle.

The existing low-drag structure of the brake caliper is mostly in the following three forms: the first is that the back plate of the friction plate is riveted with a three-jaw clamp spring and is inserted into the piston along with the assembly. And in cooperation with the increase of the piston return amount, the friction disc is quickly pulled back through the return of the piston when the brake is released, so that the friction disc is separated, and the dragging torque is reduced. Impact sound is big during this structure return, easily produces the noise among the braking process to the jump ring easily with the piston corrosion, is unfavorable for the friction disc to reprocess. The second is that the return spring form is installed to friction disc backplate both ends side ear, and the return spring is stretched during braking, draws the friction disc fast return through self resilience force when the braking releases, has guaranteed friction disc and brake disc clearance to reduce the moment of dragging. However, the structure of the type has poor durability, dust and sundries accumulated after the automobile runs for a long period of time are easy to cause the clamping deformation of the spring piece, the return performance is weakened, and even the purpose of reducing dragging can not be achieved. The third is that a V-shaped push-pull return spring is assembled between the inner and outer plates of the friction plate, the return principle of the spring is similar to that of the second structure, the inner and outer plates of the friction plate are actively separated from the brake disc through self resilience force when the brake is released, but the structural rigidity is poor, the separation capacity distributed to the whole friction plate is uneven, the friction plate is prone to eccentric wear, and the actual return capacity is not ideal.

Therefore, a drag reduction return mechanism of a brake and a brake including the same are needed to solve the above problems.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a drag reduction and return mechanism of a brake and a brake including the same, so as to solve the problem that the return effect and capability provided by the conventional brake are not ideal.

Based on the above-mentioned purpose, the application provides a drag reduction return mechanism of brake, includes:

the brake comprises an elastic bushing, a brake body and a brake lining, wherein the elastic bushing comprises a first connecting end and a second connecting end which are oppositely arranged, and the first connecting end and the second connecting end are respectively used for being connected with a guide pin and a caliper bracket of the brake;

each return spring is sleeved on the elastic bushing and can stretch along the axial direction of the elastic bushing; the return spring is made of spring steel.

Optionally, the elastic bushing includes a center pillar and an accommodating cavity disposed along a circumferential direction of the center pillar, the first connecting end and the second connecting end are respectively disposed at two opposite ends of the center pillar, and each of the return springs is at least partially disposed in the accommodating cavity.

Optionally, the receiving cavity extends spirally in an axial direction of the center pillar.

Optionally, a first buffer cavity is disposed between the accommodating cavity and the first connection end, and/or a second buffer cavity is disposed between the accommodating cavity and the second connection end.

Optionally, the second connecting end and the caliper support are connected in a lifting mode.

Optionally, a guide pin hole is formed in an end surface of the first connection end, and the guide pin is slidably connected with the guide pin hole.

Optionally, the elastic bushing and the return spring are integrally formed.

The application also proposes a brake comprising a drag reduction return mechanism as described above.

Optionally, the brake caliper and a caliper housing at least partially covering the brake caliper are provided, the opposite ends of the brake caliper are provided with caliper brackets, the opposite ends of the caliper housing are provided with guide pins, and a drag reduction return mechanism of the brake is connected between the caliper brackets and the guide pins which are arranged oppositely.

In addition, optionally, the brake caliper further comprises a caliper body, and the two caliper brackets are respectively arranged at two opposite ends of the caliper body; the caliper shell covers the caliper body and can move to and fro relative to the caliper body.

From the foregoing, it can be seen that the drag reduction return mechanism of the brake and the brake including the same provided by the application have the following advantages compared with the prior art: by adopting the drag reduction return mechanism of the brake, the elastic bushing is arranged between the caliper bracket and the caliper shell, so that circumferential friction force does not exist, and the elastic bushing is favorable for returning; moreover, the friction sheet end does not need to be arranged, so that the space is saved; the return spring is used for enhancing the deformation capacity and the structural rigidity of the elastic bushing, and after being compressed by external force, the return spring forms quick return capacity when being released, and when the brake is tightened, the elastic bushing and the return spring are compressed; when the brake is released, the return spring pushes the elastic bushing to return quickly for recovering the elastic deformation, so that the gap between the friction plate and the brake disc is ensured, the pressure applied on the friction plate is removed, the friction plate can return quickly, and the dragging torque is reduced. Meanwhile, the return spring is only contacted with the elastic bushing and is not contacted with other accessories, and the elastic bushing can avoid the return spring from generating abnormal sound in the elastic stretching process.

Drawings

The above features and technical advantages of the present application will become more apparent and readily appreciated from the following description of the embodiments thereof taken in conjunction with the accompanying drawings.

FIG. 1 is a schematic illustration of a brake including a drag reduction return mechanism for the brake as employed in a particular embodiment of the present application.

Fig. 2 is an enlarged partial view of portion a of the brake shown in fig. 1 including a drag reduction return mechanism for the brake.

Fig. 3 is a perspective view, partially in section, of the brake shown in fig. 2 including a drag-drop return mechanism for the brake.

Fig. 4 is a schematic structural diagram of a brake including a drag reduction return mechanism of the brake shown in fig. 2 at a position B.

Wherein the reference numbers:

1. an elastic bushing; 2. a guide pin; 3. a guide pin hole; 4. a brake caliper; 5. a caliper housing; 6. a caliper bracket; 7. and a return spring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings in combination with specific embodiments. In which like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings. The terms "inner" and "outer" are used to refer to directions toward and away from, respectively, the geometric center of a particular component.

FIG. 1 is a schematic illustration of a brake including a drag reduction return mechanism for the brake as employed in a particular embodiment of the present application. Fig. 2 is an enlarged partial view of portion a of the brake shown in fig. 1 including a drag reduction return mechanism for the brake. Fig. 3 is a perspective view, partially in section, of the brake shown in fig. 2 including a drag-drop return mechanism for the brake. Fig. 4 is a schematic structural diagram of a brake including a drag reduction return mechanism of the brake shown in fig. 2 at a position B. As shown in fig. 1 to 4, the brake drag-down return mechanism comprises an elastic bushing 1 and at least one return spring 7.

The elastic bushing 1 comprises a first connecting end and a second connecting end which are oppositely arranged, and the first connecting end and the second connecting end are respectively used for being connected with the guide pin 2 and the caliper bracket 6;

each return spring 7 is sleeved on the elastic bushing 1 and can stretch along the axial direction of the elastic bushing 1; the return spring is made of spring steel.

The elastic bushing 1 is arranged between a caliper shell 5 and a caliper support 6 of the brake, the elastic bushing 1 is connected to the caliper support 6 through a second connecting end, and the caliper shell 5 is connected to a first connecting end through a guide pin 2; the return spring 7 is sleeved on the elastic bushing 1. The return spring 7 provides a supporting function for the elastic bush 1 while enhancing the return capability of the elastic bush 1. When the brake is tightened, the caliper shell 5 moves towards one side of the caliper bracket 6, and the guide pin 2 presses the elastic bushing 1 down, so that the elastic bushing 1 and the return spring 7 are compressed; when the brake is released, the return spring 7 pushes the elastic bushing 1 to drive the guide pin 2 to return quickly for recovering deformation, then the caliper shell 5 returns quickly, and pressure applied to the friction plate is removed, so that the friction plate can return quickly.

By adopting the drag reduction and return mechanism of the brake, the elastic bushing 1 is arranged between the caliper bracket 6 and the caliper shell 5, so that circumferential friction force does not exist, and the elastic bushing 1 is favorable for returning; moreover, the friction sheet end does not need to be arranged, so that the space is saved; the return spring 7 is used for enhancing the deformation capacity and the structural rigidity of the elastic bushing 1, and after being compressed by external force, the quick return capacity is formed when the elastic bushing 1 is released, and when the elastic bushing 1 and the return spring 7 are compressed during braking and tightening; when the brake is released, the return spring 7 pushes the elastic bushing 1 to return quickly for recovering the elastic deformation, so that the gap between the friction plate and the brake disc is ensured, the pressure applied to the friction plate is removed, the friction plate can return quickly, and the dragging torque is reduced. Meanwhile, the return spring 7 is only contacted with the elastic bushing 1 and is not contacted with other accessories, and the elastic bushing 1 can avoid the return spring 7 from generating abnormal sound in the elastic expansion process.

In this embodiment, the return spring 7 is sleeved on the elastic bushing 1 and located between the first connection end and the second connection end. The number of the return springs 7 can be selected according to the height of the elastic bushing 1 and the elastic force requirement, and at least one return spring 7 is usually arranged in the elastic bushing 1. When return spring 7's quantity is a plurality of, a plurality of return spring 7 set gradually along the direction of height of elastic bush 1, and a plurality of return spring 7 can stretch out and draw back in step and produce deformation or produce deformation along the direction of atress in proper order.

In this embodiment, the return spring 7 is made of spring steel, the return spring 7 may be a compression spring for bearing axial pressure, the compression spring may have a circular cross section or may have a rectangular or elliptical cross section, the compression spring may have a cylindrical or conical shape, a certain gap is formed between rings of the compression spring, and the compression spring may have an equal pitch or a variable pitch. The compression spring is contracted and deformed by pressure, the deformation energy is stored, and after the pressure is released, the deformation energy is released to restore the original shape.

In the embodiment, the spring is made of spring steel, so that the process is mature, the manufacturing is easy, the cost is low, the surface quality is good, the performance is stable, the shape and the size are accurate, the forming effect is good, and the requirements of various sizes can be met.

Optionally, the elastic bushing 1 includes a center pillar and a receiving cavity disposed along a circumferential direction of the center pillar, the first connection end and the second connection end are respectively disposed at opposite ends of the center pillar, and each return spring 7 is at least partially located in the receiving cavity. The return spring 7 is sleeved on the center pillar, two opposite ends of the return spring 7 can abut against the first connecting end and the second connecting end, and the accommodating cavity provides an accommodating space for the return spring 7. Adopt above-mentioned elastic bushing 1, can be in close joint with return spring 7 and be in the same place, return spring 7 can support elastic bushing 1, strengthens elastic bushing 1's return ability simultaneously.

In this embodiment, the elastic bush 1 has an i-shape, and the diameters of the first connection end and the second connection end are both larger than the diameter of the center pillar. The return spring 7 is sleeved on the center post and is abutted against the first connecting end and/or the second connecting end.

In this embodiment, the holding chamber sets up on the circumferential direction of center pillar, and extends along axial direction, is located between first link and the second link, and the holding chamber is the cavity that is screw thread form or spring form or crest trough form, is the cavity of crest trough form like the holding chamber, and the cavity includes a plurality of sub-cavities that communicate in proper order, and the sub-cavity that extends to keeping away from center pillar one side is the crest segment, is the trough segment to the sub-cavity that extends to being close to center pillar one side, and every round of return spring 7 all is located the crest segment.

In this embodiment, the accommodating cavity is integrally formed with the center pillar.

In another embodiment of the present application, the accommodating cavities may be formed by separate structural assembling, for example, the accommodating cavities include a first accommodating cavity and a second accommodating cavity, contact surfaces of the first accommodating cavity and the second accommodating cavity are provided with a clamping structure, and the first accommodating cavity and the second accommodating cavity are connected together through the clamping structure, sleeved on the center pillar, and provide an installation space for the return spring 7.

Optionally, the receiving cavity extends helically in the axial direction of the center pillar. The accommodating cavity extends from the first connecting end to the second connecting end, and the accommodating cavity wraps and covers the return spring 7, so that the return spring 7 is prevented from being exposed to the environment. Through the shape that sets up elastic bushing 1, can be fine with return spring 7 and fuse an organic whole structure, place the holding intracavity in return spring 7, return spring 7 noise production is avoided in the holding chamber. Moreover, the return spring 7 is small in size and small in mass, is arranged in the accommodating cavity, and can stably realize performance through limiting of the accommodating cavity.

The middle column can adopt an equal-diameter structure or a variable-diameter structure, in the embodiment, the middle column comprises a middle column body, and a first connecting end and a second connecting end which are respectively arranged at two opposite ends of the middle column body, the diameter of the middle column body is smaller than that of the first connecting end, the diameters of the first connecting end and the second connecting end are basically equal, the first connecting end and the second connecting end are provided with gradual change sections, and smooth transition is realized from the first connecting end to the middle column body and from the second connecting end to the middle column body; after the central pillar body is provided with the accommodating cavity in the circumferential direction, the maximum distance between two opposite sides of the accommodating cavity is greater than the first connecting end.

Optionally, a first buffer cavity is arranged between the accommodating cavity and the first connecting end, and/or a second buffer cavity is arranged between the accommodating cavity and the second connecting end. First cushion chamber and second cushion chamber provide buffer space for elastic bush 1, when elastic bush 1 receives influences such as vibration, can not take place flexible by a wide margin, but absorb through first cushion chamber and second cushion chamber. The elastic bushing 1 has a buffering effect.

In this embodiment, a first buffer cavity is disposed between the first connecting end and the accommodating cavity, and the first buffer cavity is an approximately S-shaped cavity.

In another embodiment of the present application, a second buffer cavity is disposed between the second connecting end and the accommodating cavity, and the second buffer cavity is an approximately S-shaped cavity or an acute-angled cavity.

Optionally, the second connecting end is connected with the caliper bracket 6 in a lifting manner. Through adjusting the connection position of calliper support 6 and second link, can adjust the pretightning force to elastic bushing 1 and return spring 7, when braking step up or braking release, can respond in time effectively and stretch out and draw back.

In this embodiment, the second connection end is screwed to the caliper bracket 6.

Optionally, a guide pin hole 3 is formed in an end face of the first connection end, and the guide pin 2 is slidably connected with the guide pin hole 3. When the brake is tightened, the caliper shell 5 drives the guide pin 2 to move downwards along the guide pin hole 3, and presses the elastic bushing 1 downwards to move downwards, so that the elastic bushing 1 and the return spring 7 are compressed and deformed; when the brake is released, the return spring 7 pushes the elastic bushing 1 to reset, the guide pin 2 moves along the guide pin hole 3 in the reverse direction, and the guide pin 2 drives the caliper shell 5 to reset.

In another embodiment of the application, a pin hole is formed in the end face of the first connecting end, the guide pin 2 is connected in the pin hole, the position of the guide pin 2 is relatively fixed with that of the elastic bushing 1, and when the caliper shell 5 drives the guide pin 2 to move downwards during braking and fastening, the guide pin 2 pushes the elastic bushing 1 to move downwards synchronously, so that the elastic bushing 1 and the return spring 7 are compressed and deformed; when the brake is released, the return spring 7 pushes the elastic bushing 1 to reset, and the guide pin 2 drives the caliper shell 5 to reset.

Alternatively, the elastic bushing 1 and the return spring 7 are integrally formed. The elastic bushing 1 is generally made of a rubber material. The return spring 7 is cast in the production of the elastic bushing 1, so that the resilience of the elastic bushing 1 is enhanced, and quick response extension and retraction are realized.

The use of the brake drag reduction return mechanism is described further below.

The elastic bushing 1 is arranged between the caliper shell 5 and the caliper support 6, the elastic bushing 1 is connected to the caliper support 6 through a second connecting end, and the caliper shell 5 is connected to the first connecting end through the guide pin 2; the return spring 7 is sleeved on the elastic bushing 1 and is arranged in the accommodating cavity. The return spring 7 provides a supporting function for the elastic bushing 1, and simultaneously enhances the deformation capacity, rigidity and return capacity of the elastic bushing 1. When the brake is tightened, the caliper shell 5 moves towards one side of the caliper bracket 6, and the guide pin 2 presses the elastic bushing 1 down, so that the elastic bushing 1 and the return spring 7 are compressed; when the braking is released, the return spring 7 is deformed for recovering, the return spring 7 drives the guide pin 2 to return quickly by pushing the elastic bushing 1 by self elasticity, then the caliper shell 5 returns quickly, so that the caliper shell 5 and the friction plate are separated, the pressure on the friction plate is rapidly removed, and the friction plate can return quickly, so that the dragging effect is reduced.

The application also provides a brake, which comprises the brake dragging reduction return mechanism.

In the prior art, after the brake pressure is released, the friction plate is returned by the following two ways: the first way is that the brake disc rotates, the friction plate is pulled out through the jumping of the brake disc, and the friction plate return spring is needed to be arranged for matching in the process; if friction disc return springs (corresponding to the second dragging return mechanism in the background art) are installed at the lug ends of the friction discs, the friction disc return springs are assembled on the side lugs of the friction discs, the friction disc return springs are stretched during braking, and when the braking is released, the friction discs are pulled to return quickly through self resilience force, so that the gap between the friction discs and a brake disc is ensured, and the dragging torque is reduced. Or a V-shaped return spring (corresponding to a third dragging reduction return mechanism in the background technology) is arranged between the inner friction plate and the outer friction plate, the V-shaped return spring is assembled at the upper end of the back plate of the friction plate, the V-shaped return spring is stretched when braking, and when the braking is released, the inner friction plate and the outer friction plate are pushed to be quickly separated from the brake disc through self resilience force, so that the gap between the friction plate and the brake disc is ensured, and the dragging reduction effect is achieved. However, the two structures have the problems of clamping stagnation deformation or uneven capacity, and the actual return capacity is not ideal. The second approach is that the piston slowly returns through a sealing ring in the shell after the pressure is released, the pressure applied to the friction plate by the piston is separated, so that the friction plate slowly responds, and in the process, a back plate snap spring is required to be matched, for example, by installing a back plate snap spring (corresponding to the first drag reduction return mechanism in the background art) on the back plate of the friction plate, when the piston returns, the inner plate of the friction plate is directly pulled to return, but noise exists, and the maintenance is not facilitated.

In one embodiment of the present application, the brake includes two opposite drag reduction return mechanisms of the brake, the caliper housing 5 is provided with the guide pin 2, and opposite ends of the drag reduction return mechanism of each brake are respectively connected with the guide pin 2 and the caliper bracket 6 of the brake. When the braking steps up, calliper casing 5 drives uide pin 2 and slides, causes the low mechanism that drags to produce compressive deformation, and after the braking release, the low mechanism that drags recovers deformation rapidly, drives uide pin 2 and calliper casing 5 return for calliper casing 5 and friction disc separation, the pressure on the friction disc is applyed to separation calliper casing 5, thereby makes the friction disc return fast.

Adopt above-mentioned stopper, equipment return spring 7 on elastic bush 1, the dragging return mechanism that falls of stopper can satisfy the return requirement that falls the dragging, and uide pin 2 utilizes return spring 7 to add the return ability of holding on elastic bush 1 at the return in-process, and help uide pin 2 slides fast, and then drives calliper casing 5 quick return to realize quick separation calliper casing 5 to the pressure of friction disc, the quick return of friction disc realizes falling the effect that drags.

Optionally, the brake caliper 4 and at least part of the caliper housing 5 covering the brake caliper 4 are provided with caliper brackets 6 at opposite ends of the brake caliper 4, guide pins 2 are provided at opposite ends of the caliper housing 5, and a brake drag reduction return mechanism is connected between the caliper brackets 6 and the guide pins 2. The caliper shell 5 is used for applying pressure to the friction plate, the drag reduction return mechanism of the brake is arranged between the caliper shell 5 and the caliper support 6 which are oppositely arranged on the same side, the caliper support 6 is connected with the drag reduction return mechanism of the brake through the guide pins 2, the two guide pins 2 synchronously act, and the drag reduction return mechanisms of the two brakes synchronously contract to generate deformation; when the two guide pins 2 return synchronously, the dragging-reducing return mechanisms of the two brakes restore to deformation synchronously and drive the guide pins 2 to return at an accelerated speed, the two guide pins 2 simultaneously drive the caliper shell 5 to return, and the pressure applied to the friction plate by the caliper shell 5 is separated. Adopt above-mentioned stopper, can guarantee calliper casing 5's both ends synchronization action, and then guarantee calliper casing 5's effective return.

In addition, optionally, the brake caliper 4 further comprises a caliper body, and the two caliper brackets 6 are respectively arranged at two opposite ends of the caliper body; the caliper housing 5 covers the caliper body and can reciprocate relative to the caliper body. Calliper casing 5 covers and establishes on the calliper body, and the uide pin 2 at calliper casing 5 both ends sets up with calliper support 6 one-to-one of calliper body both sides, and the setting of the fall of every stopper drags the return mechanism between calliper support 6 and the uide pin 2 with one side. By adopting the brake, the brake has the advantages of simple structure, rapid action and reduction of the return difficulty of the caliper shell 5.

As can be seen from the above description and practice, the drag reduction return mechanism of the brake and the brake including the same provided by the present application have the following advantages compared with the prior art: by adopting the drag reduction return mechanism of the brake, the elastic bushing is arranged between the caliper bracket and the caliper shell, so that circumferential friction force does not exist, and the elastic bushing is favorable for returning; moreover, the friction sheet end does not need to be arranged, so that the space is saved; the return spring is used for enhancing the deformation capacity and the structural rigidity of the elastic bushing, and after being compressed by external force, the return spring forms quick return capacity when being released, and when the brake is tightened, the elastic bushing and the return spring are compressed; when the brake is released, the return spring pushes the elastic bushing to return quickly for recovering the elastic deformation, so that the gap between the friction plate and the brake disc is ensured, the pressure applied on the friction plate is removed, the friction plate can return quickly, and the dragging torque is reduced. Meanwhile, the return spring is only contacted with the elastic bushing and is not contacted with other accessories, and the elastic bushing can avoid the return spring from generating abnormal sound in the elastic stretching process.

Those of ordinary skill in the art will understand that: the above description is only exemplary of the present application and should not be construed as limiting the present application, and any modification, equivalent replacement, or improvement made within the spirit of the present application should be included in the protection scope of the present application.