CN117515073A - Brake pistons, brakes and vehicles - Google Patents

Abstract

The present disclosure relates to a brake piston, a brake and a vehicle. The brake piston includes a piston base, a pushing member and an annular elastic member. The piston base is movably installed in the cylinder hole of the brake caliper body of the brake, and a piston base is formed There is a mounting groove; the pushing member includes a mounting part and a resisting part, the mounting part is rotatably arranged in the mounting groove, the resisting part is located outside the piston base and is used to resist the brake block of the brake during braking; annular elastic member It is located in the installation groove and is clamped between the outer peripheral surface of the installation part and the groove wall of the installation groove. Through the above technical solution, when the brake caliper body deforms and the brake piston exerts uneven force, the pushing member pressing against the brake pad can rotate in the piston base, so that the pressing part can fully contact the brake pad and approach the brake. One side of the piston prevents eccentric wear from occurring when the brake pad contacts the brake disc.

Description

Brake pistons, brakes and vehicles

Technical field

The present disclosure relates to the field of brake technology, and in particular, to a brake piston, a brake and a vehicle.

Background technique

The rotating element in the brake friction pair is a metal disc that works on the end face, called the brake disc. When the brake pad moves in the direction close to the brake disc and presses against the brake disc, braking force is generated. In order to enable the brake pad to move, a brake piston is usually provided in the brake caliper body of the brake. The brake piston can move under the hydraulic action of the brake fluid and push the brake pad to move. However, in the related art, when the brake caliper body works for a period of time, it may deform due to the reaction force of the brake disc, causing the movement direction of the brake piston to deviate, and thus cannot fully contact the brake pad, thus causing The brake pads are unevenly stressed, causing eccentric wear when the brake pads resist the brake disc, affecting the braking effect and the service life of the brakes.

Contents of the invention

The purpose of this disclosure is to provide a brake piston, a brake and a vehicle that can avoid eccentric wear of the brake pad caused by deformation of the brake caliper body and improve the service life of the brake.

In order to achieve the above object, according to one aspect of the present disclosure, the present disclosure provides a brake piston, including:

a piston base, used to be movably installed in the cylinder hole of the brake caliper body of the brake, and a mounting groove is formed on the piston base;

The pushing member includes a mounting part and a pressing part. The mounting part is rotatably arranged in the mounting groove. The pressing part is located outside the piston base and is used to press against the brake of the brake during braking. moving block;

An annular elastic member is located in the installation groove and is clamped between the outer peripheral surface of the installation part and the groove wall of the installation groove.

Optionally, the mounting groove includes a spherical groove, and the mounting part includes a ball head section, and the ball head section spherically cooperates with the spherical groove, so that the ball head section can rotate in the spherical groove.

Optionally, a grease storage groove for storing grease is also formed on the piston base, and the grease storage groove is connected to the bottom of the spherical groove.

Optionally, an annular groove or a mesh groove connected to the grease storage groove is formed on the groove wall of the spherical groove.

Optionally, the installation groove further includes an elastic member receiving groove connected with the spherical groove, and the installation part further includes an elastic member fitting section located between the ball head section and the resisting portion. The elastic fitting section is disposed in the elastic member receiving groove, the annular elastic member is located in the elastic member receiving groove, and the inner peripheral surface of the annular elastic member cooperates with the elastic member. The outer circumferential surface of the segment has an interference fit, and the outer circumferential surface of the annular elastic member has an interference fit with the groove wall of the elastic member receiving groove.

Optionally, the outer diameter of the elastic member fitting section gradually decreases along the direction from the resisting portion to the ball head section.

Optionally, an air-permeable groove is formed on the outer peripheral surface of the pushing member, and the air-permeable groove is used to communicate the spherical groove with the outside atmosphere.

Optionally, the pressing portion includes a contact segment for contacting the brake pad and a transition segment formed between the contact segment and the mounting portion, and the outer diameter of the contact segment is larger than the mounting portion. has an outer diameter, and there is a gap between the contact segment and the piston base.

Optionally, a weight-reducing groove is provided on the resisting portion, and the opening of the weight-reducing groove is located on a side of the contact section away from the transition section.

Optionally, the end surface of the piston base facing away from the resisting portion is formed into an arc-shaped end surface protruding in a direction away from the resisting portion.

According to another aspect of the present disclosure, the present disclosure provides a brake, which includes a brake pad, a brake disc, a brake caliper body and the above-mentioned brake piston. A cylinder hole is formed on the brake caliper body and is connected with the cylinder. The brake fluid flow channels are connected with each other, the piston base of the brake piston is movably installed in the cylinder hole, and the pushing member of the brake piston is located between the piston base and the brake pad.

According to yet another aspect of the present disclosure, the present disclosure provides a vehicle including the above-mentioned brake.

In a brake provided by the present disclosure, the piston base is movably installed in the cylinder hole of the brake caliper body of the brake. The cylinder hole is connected with the brake fluid flow channel, and the piston base can move under the action of the brake fluid. Thereby, the pushing member is driven to move in the direction close to the brake block, so as to push the brake block to clamp the brake disc, prevent the rotation of the shaft connected to the brake disc, and realize braking. When the brake caliper body is deformed so that the movement direction of the brake piston is not perpendicular to the plane where the surface of the brake pad is close to the brake piston, since the pushing member can rotate in the piston base, when the pressing part is close to a part of the brake pad After contacting the brake pad, the installation part rotates in the installation groove under the reaction force of the brake pad, thereby adjusting the position of the pushing member so that the other part of the pressing part can also press against the brake pad close to the brake piston. The surface is on the plane, so that the pressing part can completely contact the brake pad and push the brake pad to clamp the brake disc. When the braking is cancelled, the pressing part is separated from the braking block, and the annular elastic member pushes the mounting part to rotate, thereby causing the pushing member to reset.

Through the above technical solution, when the brake caliper body is deformed so that the moving direction of the brake piston is not perpendicular to the plane where the surface of the brake pad is close to the brake piston, the pushing member pressing against the brake pad can be moved in the piston base Rotate, so that the pressing part can fully contact the side of the brake pad close to the brake piston, so that the brake pad is evenly stressed, avoiding eccentric wear due to uneven force when the brake pad contacts the brake disc, and improving Braking effectiveness and brake life.

Other features and advantages of the present disclosure will be described in detail in the detailed description that follows.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. They are used to explain the present disclosure together with the following specific embodiments, but do not constitute a limitation of the present disclosure. In the attached picture:

Figure 1 is a schematic exploded cross-sectional view of a brake piston provided by an embodiment of the present disclosure;

Figure 2 is an exploded schematic diagram of a brake piston provided by an embodiment of the present disclosure;

Figure 3 is a schematic cross-sectional view of a brake piston provided by an embodiment of the present disclosure;

Figure 4 is a schematic three-dimensional structural diagram of a brake piston provided by an embodiment of the present disclosure;

Figure 5 is a schematic cross-sectional view of a brake provided by an embodiment of the present disclosure.

Explanation of reference signs

100-brake piston; 10-brake; 101-brake block; 102-brake disc; 103-brake caliper body; 1031-cylinder hole; 1032-brake fluid flow channel; 1-piston base; 11-installation groove ; 111-spherical groove; 112-elastic component receiving groove; 12-grease storage groove; 13-arc end surface; 2-push member; 21-installation part; 211-ball head section; 212-elastic component matching section; 22 -Resistance part; 221-contact section; 222-transition section; 23-breathable groove; 24-weight reduction groove; 3-annular elastic member.

Detailed ways

Specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

In this disclosure, unless otherwise specified, the directional terms used such as "upper and lower" are generally defined based on the drawing direction of the corresponding drawing. "Inside and outside" refers to the inside and outside of the contour of the corresponding component.

As shown in FIGS. 1 to 4 , according to one aspect of the present disclosure, the present disclosure provides a brake piston 100 , which includes a piston base 1 , a pushing member 2 and an annular elastic member 3 . Among them, the piston base 1 is movably installed in the cylinder hole 1031 of the brake caliper body 103 of the brake 10, and a mounting groove 11 is formed on the piston base 1; the pushing member 2 includes a mounting part 21 and a pressing part 22. The mounting part 21 is rotatably arranged in the installation groove 11, the resisting portion 22 is located outside the piston base 1 and is used to resist the brake block 101 of the brake 10 during braking; the annular elastic member 3 is located in the installation groove 11 and is clamped on between the outer peripheral surface of the mounting portion 21 and the groove wall of the mounting groove 11 .

As shown in FIG. 5 , in a brake 10 provided by the present disclosure, the piston base 1 is movably installed in the cylinder hole 1031 of the brake caliper body 103 of the brake 10 , and the cylinder hole 1031 is connected with the brake fluid flow channel 1032 , the piston base 1 can move under the action of the brake fluid, thereby driving the pushing member 2 to move in the direction close to the brake pad 101, so as to push the brake pad 101 to clamp the brake disc 102, and prevent the brake disc 102 from being connected to the brake disc 102. The shaft rotates to achieve braking. When the brake caliper body 103 is deformed so that the moving direction of the brake piston 100 is not perpendicular to the plane where the surface of the brake pad 101 is close to the brake piston 100, since the pushing member 2 can rotate in the piston base 1, when the pressing part After the part of 22 close to the brake pad 101 comes into contact with the brake pad 101, the mounting part 21 rotates in the mounting groove 11 under the reaction force of the brake pad 101, thereby adjusting the position of the pushing member 2 so that the pressing part 22 The other part can also be pressed against the plane of the surface of the brake pad 101 close to the brake piston 100 , so that the pressing part 22 can completely contact the brake pad 101 and push the brake pad 101 to clamp the brake disc 102 . When the braking is cancelled, the pressing part 22 is separated from the braking block 101, and the annular elastic member 3 pushes the mounting part 21 to rotate, thereby causing the pushing member 2 to return to its original position.

Through the above technical solution, when the brake caliper body 103 is deformed so that the moving direction of the brake piston 100 is not perpendicular to the plane where the surface of the brake pad 101 is close to the brake piston 100, due to the pushing member pressing against the brake pad 101 2 can rotate within the piston base 1, so that the pressing portion 22 can fully contact the side of the brake pad 101 close to the brake piston 100, so that the brake pad 101 is evenly stressed and avoids contact between the brake pad 101 and the brake disc 102. Eccentric wear occurs due to uneven force, thereby improving the braking effect and the service life of the brake 10.

The above-mentioned mounting portion 21 can be rotatably disposed in the mounting groove 11 through any appropriate implementation. For example, the mounting portion 21 can be rotatably disposed in the mounting groove through a universal joint, or can be rotatably disposed in the mounting groove through a rotating shaft. , this disclosure does not limit this.

In an exemplary embodiment provided by the present disclosure, in order to increase the rotation range of the pusher 2, as shown in FIG. 1, the mounting groove 11 may include a spherical groove 111, and the mounting part 21 may include a ball head section 211. The ball head section 211 spherically cooperates with the spherical groove 111, so that the ball head section 211 can rotate in the spherical groove 111. Since the brake caliper body 103 has different deformations, using a spherical fit to connect the pusher 2 and the piston base 1 can increase the rotatable range of the pusher 2, that is, the pressing portion 22 can rotate in any direction. This results in a maximum rotation range to cope with different deformations of the brake caliper.

In order to improve rotational flexibility, optionally, as shown in FIG. 1 , a grease storage groove 12 for storing grease is also formed on the piston base 1 . The grease storage groove 12 is connected to the bottom of the spherical groove 111 . The grease storage groove 12 is provided at the bottom of the spherical groove 111 and communicates with the spherical groove 111 , so that when the ball head section 211 rotates in the spherical groove 111 , the grease in the grease storage groove 12 can cover the outer wall of the ball head section 211 The friction between the outer wall of the ball head section 211 and the groove wall of the spherical groove 111 is reduced, so that the ball head section 211 can rotate faster and more flexibly. It can also reduce friction loss, eliminate friction noise and reduce heat energy generated by friction.

Optionally, the connection between the grease storage groove 12 and the spherical groove 111 is connected with an arc transition to facilitate the flow of grease from the grease storage groove 12 into the spherical groove 111 .

In order to maximize the coverage area of grease on the outer wall of the ball head section 211 and the groove wall of the spherical groove 111 , optionally, an annular groove connected to the grease storage groove 12 is formed on the groove wall of the spherical groove 111 Trench or mesh groove. An annular groove or a mesh groove connected to the grease storage groove 12 is provided on the groove wall of the spherical groove 111, so that the grease in the grease storage groove 12 can rotate in the annular shape as the ball head section 211 rotates. The grease flows in the groove or mesh groove, thereby covering the entire groove wall of the spherical groove 111 and the outer wall of the ball head section 211, which increases the coverage area of the grease on the outer wall of the ball head section 211 and the groove wall of the spherical groove 111. , thereby improving the lubrication effect of the grease. Moreover, in addition to being stored in the grease storage groove 12, grease can also be stored in annular grooves or mesh grooves on the groove wall, thereby increasing the storage capacity of grease and extending the service life of the brake piston 100.

Optionally, as shown in FIG. 1 , the installation groove 11 also includes an elastic member receiving groove 112 connected with the spherical groove 111 . The installation part 21 also includes an elastic member fitting section 212 . The elastic fitting section is located between the ball head section 211 and the resisting part. 22, the elastic fitting section passes through the elastic piece receiving groove 112, the annular elastic piece 3 is located in the elastic piece receiving groove 112, and the inner circumferential surface of the annular elastic piece 3 interferes with the outer circumferential surface of the elastic piece fitting section 212 The outer circumferential surface of the annular elastic member 3 has an interference fit with the groove wall of the elastic member receiving groove 112 .

When the mounting part 21 rotates in the spherical groove 111, the elastic member matching section 212 will squeeze the annular elastic member 3, but since the elastic member can undergo elastic deformation, it will not hinder the rotation of the mounting part 21. When the pressing portion 22 is separated from the braking block 101, the elastic member fitting section 212 will receive the restoring force of the annular elastic member 3, thereby causing the pushing member 2 to return to its original position. Such arrangement can ensure that the mounting portion 21 can be reset under the action of the annular elastic member 3 after each push of the brake piston 100 is completed, and can cope with different rotation directions.

Moreover, since the inner circumferential surface of the annular elastic member 3 is in interference fit with the outer circumferential surface of the elastic member mating section 212, and the outer circumferential surface of the annular elastic member 3 is in interference fit with the groove wall of the elastic member receiving groove 112, the mounting portion 21 can It is installed in the installation groove 11 through the annular elastic member 3, and the assembly method is simple and easy to operate.

Alternatively, the annular elastic member 3 may be a rubber member. The rubber parts have physical properties of high temperature resistance and corrosion resistance, and can extend the service life of the brake piston 100 . Moreover, the rubber parts also have a heat-insulating effect, which can protect the sealing ring in the piston cylinder hole 1031 and increase the service life of the sealing ring.

In order to facilitate assembly, optionally, the outer diameter of the elastic member fitting section 212 gradually decreases along the direction from the pressing portion 22 to the ball head section 211 . During the assembly of the brake piston 100, the outer diameter of the elastic member fitting section 212 is set to gradually decrease in the direction from the pressing portion 22 to the ball head section 211, so that during the assembly process, the outer diameter of the annular elastic member 3 is first The contact part of the inner circumferential surface is the part of the outer circumferential surface of the elastic member mating section 212 with a smaller outer diameter. As the mounting part 21 is inserted, the outer diameter gradually increases, and finally reaches the inner circumferential surface of the annular elastic member 3 and the elastic member. The outer circumferential surface of the fitting section 212 is in an interference fit state, and the outer circumferential surface of the annular elastic member 3 is in an interference fit state with the groove wall of the elastic member receiving groove 112 . Such an arrangement makes the assembly process simpler and more labor-saving, making it easier for operators to install and maintain.

Optionally, as shown in FIG. 2 , a breathable groove 23 is formed on the outer peripheral surface of the pushing member 2 , and the breathable groove 23 is used to connect the spherical groove 111 with the outside atmosphere. When the mounting part 21 is installed in the spherical groove 111, in order to facilitate rotation, there is a certain gap between the outer peripheral surface of the ball head section 211 and the groove wall of the spherical groove 111, and the inner peripheral surface of the annular elastic member 3 and the elastic member The outer peripheral surface of the fitting section 212 has an interference fit, and the outer peripheral surface of the annular elastic member 3 has an interference fit with the groove wall of the elastic member receiving groove 112, so that the annular elastic member 3 seals and isolates the spherical groove 111 from the outside world. The friction between the brake pad 101 and the brake disc 102 will generate a large amount of heat and conduct it to the brake piston 100. The brake piston 100 is heated, and the air in the gap between the outer peripheral surface of the ball head section 211 and the groove wall of the spherical groove 111 is heated, and the volume Expansion may push the mounting portion 21 out of the spherical groove 111 . Therefore, a breathable groove 23 is provided on the outer peripheral surface of the pushing member 2 to connect the spherical groove 111 with the outside atmosphere, so that the gas expansion in the gap can be discharged into the atmosphere through the breathable groove 23. The pressure in the gap is the same as that of the outside atmosphere, ensuring that the brake Normal use of piston 100.

Optionally, the breathable groove 23 may be formed on the elastic fitting section 212 and at least part of the ball head section 211 and at least part of the resisting part 22 .

Optionally, the spherical center of the ball head section 211 can be concentrically arranged with the inner spherical center of the spherical groove 111, and the difference between the radius of the spherical surface where the ball head section 211 is located and the radius of the spherical surface where the spherical groove 111 is located can be 0.3-0.7 mm. .

In order to enable the brake piston 100 to apply force evenly, optionally, as shown in FIGS. 1 and 3 , the resisting portion 22 includes a contact section 221 for contacting the brake pad 101 and is formed between the contact section 221 and the mounting portion 21 The outer diameter of the transition section 222 and the contact section 221 is larger than the outer diameter of the mounting part 21 , and there is a gap between the contact section 221 and the piston base 1 . Since the contact section 221 is used to contact the brake pad 101, the outer diameter of the contact section 221 is larger, so that the force area of the piston on the brake pad 101 is larger, so that the brake pad 101 is more evenly stressed and avoids braking. Block 101 is subject to eccentric wear. Moreover, there is a gap between the contact section 221 and the piston base 1, so that the contact section 221 will not interfere with the piston base 1 when rotating, thereby increasing the rotation range of the pusher 2.

The pusher 2 can be made of heat-insulating materials (such as titanium, ceramics, etc.) to reduce heat conduction between the brake block 101 and the pusher 2 and increase the service life of the sealing ring in the cylinder hole 1031.

In order to reduce the weight of the brake piston 100, optionally, as shown in Figures 1, 3 and 4, a weight reduction groove 24 is opened on the pressing portion 22, and the opening of the weight reduction groove 24 is located on the contact surface. The section 221 is on the side facing away from the transition section 222 . With this arrangement, on the one hand, the weight of the brake piston 100 can be reduced, making the entire brake piston 100 lighter; on the other hand, the opening of the weight reduction groove 24 is located on the side of the contact section 221 away from the transition section 222, that is, On the side in contact with the brake pad 101, the additional opening can reduce the contact area between the contact section 221 and the brake pad 101. Reducing the contact area can reduce the friction between the pushing member 2 and the brake pad 101 during the braking process. The thermal conduction area between the cylinder holes 1031 reduces heat conduction and increases the service life of the sealing ring in the cylinder hole 1031.

Optionally, as shown in FIG. 2 , the end surface of the piston base 1 away from the resisting portion 22 is formed into an arc-shaped end surface 13 protruding in a direction away from the resisting portion 22 . Because the brake piston 100 needs to be installed in the cylinder hole 1031 of the brake caliper body 103 during operation, and moves under the driving of the brake fluid. The end surface of the piston base 1 facing away from the pressing portion 22 is pushed by the brake fluid, thereby causing the entire brake piston 100 to move outward. The end surface is configured as an arc-shaped end surface 13 that protrudes in a direction away from the resisting portion 22. When the end surface is stressed, the force direction is perpendicular to the tangent direction of the arc-shaped end surface 13 and intersects with the center of the circle where the arc is located. center of circle. With this arrangement, the driving force received by the piston base 1 is more concentrated, preventing uneven force on both sides of the base and ensuring the braking effect.

As another aspect of the present disclosure, as shown in Figure 5, the present disclosure also provides a brake 10, including a brake pad 101, a brake disc 102, a brake caliper body 103 and the above-mentioned brake piston 100. The brake caliper body A cylinder hole 1031 and a brake fluid flow channel 1032 connected with the cylinder hole 1031 are formed on the cylinder hole 103. The piston base 1 of the brake piston 100 is movably installed in the cylinder hole 1031. The pusher 2 of the brake piston 100 is located between the piston base 1 and the cylinder hole 1031. between brake pads 101.

As yet another aspect of the present disclosure, the present disclosure provides a vehicle including the above-mentioned brake 10 .

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above-mentioned embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure. These simple modifications all belong to the protection scope of the present disclosure.

In addition, it should be noted that the specific technical features described in the above-mentioned specific embodiments can be combined in any suitable manner as long as there is no contradiction. In order to avoid unnecessary repetition, various possible combinations will not be further described in this disclosure.

In addition, any combination of various embodiments of the present disclosure can also be carried out, and as long as they do not violate the idea of the present disclosure, they should also be regarded as the contents disclosed in the present disclosure.

Claims (12)

1. A brake piston, characterized in that it includes: a piston base, used to be movably installed in the cylinder hole of the brake caliper body of the brake, and a mounting groove is formed on the piston base; The pushing member includes a mounting part and a pressing part. The mounting part is rotatably arranged in the mounting groove. The pressing part is located outside the piston base and is used to press against the brake of the brake during braking. moving block; An annular elastic member is located in the installation groove and is clamped between the outer peripheral surface of the installation part and the groove wall of the installation groove. 2. The brake piston according to claim 1, wherein the mounting groove includes a spherical groove, the mounting portion includes a ball head section, the ball head section spherically cooperates with the spherical groove, so that the The ball head section can rotate in the spherical groove. 3. The brake piston according to claim 2, wherein a grease storage groove for storing grease is also formed on the piston base, and the grease storage groove is connected to the bottom of the spherical groove. 4. The brake piston according to claim 3, wherein an annular groove or a mesh groove connected to the grease storage groove is formed on the groove wall of the spherical groove. 5. The brake piston according to claim 2, wherein the installation groove further includes an elastic member receiving groove connected with the spherical groove, the installation part further includes an elastic member fitting section, and the elastic member fits The segment is located between the ball head segment and the resisting portion, the elastic member matching segment is disposed in the elastic member receiving groove, the annular elastic member is located in the elastic member receiving groove, and the The inner circumferential surface of the annular elastic member is in interference fit with the outer circumferential surface of the elastic member mating section, and the outer circumferential surface of the annular elastic member is in interference fit with the groove wall of the elastic member receiving groove. 6. The brake piston according to claim 5, wherein the outer diameter of the elastic member fitting section gradually decreases along the direction from the resisting portion to the ball head section. 7. The brake piston according to any one of claims 2 to 6, characterized in that an air-permeable groove is formed on the outer peripheral surface of the pushing member, and the air-permeable groove is used to communicate the spherical groove with the outside atmosphere. . 8. The brake piston according to any one of claims 1 to 6, wherein the pressing portion includes a contact section for contacting the brake pad and is formed between the contact section and the mounting portion. The outer diameter of the contact segment is larger than the outer diameter of the mounting part, and there is a gap between the contact segment and the piston base. 9. The brake piston according to claim 8, wherein a weight-reducing groove is formed on the pressing portion, and the opening of the weight-reducing groove is located on a side of the contact section away from the transition section. 10. The brake piston according to any one of claims 1 to 6, wherein the end surface of the piston base facing away from the pressing portion is formed into an arc shape that protrudes in a direction away from the pressing portion. End face. 11. A brake, characterized in that it includes a brake pad, a brake disc, a brake caliper body and the brake piston according to any one of claims 1 to 10, and a cylinder hole is formed on the brake caliper body. and a brake fluid flow channel communicated with the cylinder bore. The piston base of the brake piston is movably installed in the cylinder bore. The pushing member of the brake piston is located between the piston base and the brake pad. between. 12. A vehicle comprising the brake of claim 11.