Piston, brake and vehicle

Abstract

The invention discloses a piston, a brake and a vehicle. The piston comprises a limiting seat, a piston body and a compensation structure, multiple stages of limiting structures are arranged on the limiting seat, the piston body can reciprocate in the first direction relative to the limiting seat to participate in braking or returning, and the compensation structure can be matched with the limiting structures of different stages in a limiting mode; the piston body is in transmission connection with the compensation structure so as to drive the compensation structure to be matched with the limiting structures of different levels to compensate the brake clearance. According to the piston, the piston body is arranged to drive the compensation structure to be matched with different levels of limiting structures in a limiting mode, compensation of the brake clearance can be achieved, the brake clearance is made to be within a reasonable range, and safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle components, and in particular to a piston, a brake and a vehicle. Background Art

[0002] In the related technology, the piston body of the piston presses the brake pad. When the piston body is in the pressing position, the brake pad is pressed by the piston body until it is tightly against the brake disc, thereby the brake pad brakes the brake disc; after the brake is cancelled, under the action of the spring, the piston body returns to the initial position, releasing the pressure on the brake pad, and the brake pad and the brake disc can be out of contact.

[0003] However, during use, the brake pad is half worn or even completely worn, and the brake pad needs to move a longer distance under the pressure of the piston body to be close to the brake disc. From the initial position to the pressing position of the brake pad against the brake disc, the movement distance of the piston body also increases, resulting in an increase in the braking clearance, braking time, and braking distance, which increases the braking risk of the vehicle.

[0004] Thus, there is room for improvement. Summary of the invention

[0005] The present invention aims to solve at least one of the above-mentioned technical problems in the prior art to a certain extent. To this end, the present invention provides a piston that can compensate for the brake clearance.

[0006] The invention also provides a brake having the piston.

[0007] The present invention also provides a vehicle.

[0008] According to an embodiment of the present invention, the piston includes a limit seat, a piston body and a compensation structure. The limit seat is provided with a multi-stage limit structure. The piston body can reciprocate in a first direction relative to the limit seat to participate in braking or returning. The compensation structure can cooperate with the limit structures of different stages. The piston body and the compensation structure can be transmission-connected to drive the compensation structure to cooperate with the limit structures of different stages to compensate for the braking clearance.

[0009] According to the piston of the embodiment of the present invention, by setting the piston body to drive the compensation structure to cooperate with the limiting structures of different levels, it is possible to achieve compensation for the braking clearance, so that the braking clearance is within a reasonable range to improve safety.

[0010] According to some embodiments of the present invention, the multi-stage limiting structures are arranged at intervals along the first direction.

[0011] According to some embodiments of the present invention, the limiting seat portion is configured as a sawtooth structure, and the limiting structure is formed between two adjacent sawteeth of the sawtooth structure.

[0012] According to some embodiments of the present invention, the saw teeth have chamfers to guide the compensation structure to be embedded in the limiting structure.

[0013] According to some embodiments of the present invention, the compensation structure includes a limiting portion and a main body portion, the main body portion is drivably connected to the piston body, and the limiting portion can move along the first direction driven by the main body portion so that the limiting portion cooperates with the limiting structures of different levels.

[0014] According to some embodiments of the present invention, the limiting portion can reciprocate relative to the main body in a second direction so that the limiting portion and the limiting structure can be in limiting engagement or out of limiting engagement, and the second direction is perpendicular to the first direction.

[0015] According to some embodiments of the present invention, when the piston body drives the main body to move along the first direction, the limiting portion cooperates with the limiting seat to enable the limiting portion to reciprocate along the second direction.

[0016] According to some embodiments of the present invention, the limiting portion includes a limiting column and a limiting elastic member, and the limiting column is movably connected to the main body portion through the limiting elastic member.

[0017] According to some embodiments of the present invention, there are a plurality of the limiting portions, and the plurality of the limiting portions are spaced apart in the circumferential direction of the piston body.

[0018] According to some embodiments of the present invention, the main body portion includes a first main body portion, the first main body portion is provided with a first groove, and the limiting portion is suitable for being at least partially received in the first groove.

[0019] According to some embodiments of the present invention, the main body portion further includes a second main body portion, the second main body portion is connected to the first main body portion, and the piston body is drivingly connected to the second main body portion.

[0020] According to some embodiments of the present invention, the piston body is provided with a second groove, the second body portion is partially disposed in the second groove, and a groove wall of the second groove can drive the second body portion to move along the first direction.

[0021] According to some embodiments of the present invention, the second main body portion includes a first section, at least a portion of the first section is disposed in the second groove, and in the first direction, there is a gap between the first section and at least one side wall of the second groove so that the first section can move along the first direction in the second groove.

[0022] According to some embodiments of the present invention, the first section has a chamfered structure to guide the first section to be assembled into the second groove.

[0023] According to some embodiments of the present invention, the piston body has a receiving cavity with one end open, and the limiting seat is at least partially located in the receiving cavity.

[0024] According to some embodiments of the present invention, the piston further includes a resetting elastic member, and the resetting elastic member is used to apply an elastic force to the piston body to return the piston body to its original position.

[0025] According to some embodiments of the present invention, one end of the resetting elastic member is connected to the piston body, and the other end is connected to the limiting seat.

[0026] The brake according to the embodiment of the present invention comprises a brake caliper and the above-mentioned piston. The brake caliper comprises a caliper body, a piston cavity is formed on the caliper body, and the piston is installed in the piston cavity.

[0027] According to the brake of the embodiment of the present invention, the piston can realize compensation for the braking clearance by setting the piston body to drive the compensation structure and the limiting structure of different levels to cooperate, so that the braking clearance is within a reasonable range to improve safety.

[0028] According to some embodiments of the present invention, the brake also includes a brake disc, and the brake caliper also includes a brake pad, which is mounted on the caliper body and can move back and forth along the first direction; the limit seat is fixedly connected to the caliper body, and the piston body is suitable for approaching the brake pad to push the brake pad to brake the brake disc, or moving away from the brake pad to separate the brake pad from the brake disc when moving back and forth in the first direction.

[0029] According to some embodiments of the present invention, one of the clamp body and the limiting seat has a positioning boss, and the other has a positioning mounting hole, and the positioning boss is disposed in the positioning mounting hole.

[0030] A vehicle according to an embodiment of the present invention includes a brake according to an embodiment of the present invention.

[0031] According to the vehicle of the embodiment of the present invention, the piston of the brake can compensate for the braking clearance by setting the piston body to drive the compensation structure and the limiting structure of different levels to cooperate, so that the braking clearance is within a reasonable range to improve safety.

[0032] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a cross-sectional view of a piston according to an embodiment of the present invention;

[0034] Figure 2 is a cross-sectional view of the cooperation between the piston and the caliper body according to an embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of a piston at a viewing angle according to an embodiment of the present invention;

[0036] Figure 4 is a schematic diagram of a piston from another perspective according to an embodiment of the present invention;

[0037] Figure 5 is a schematic diagram of a piston according to an embodiment of the present invention at another viewing angle;

[0038] Figure 6 is a cross-sectional view of a brake caliper and a brake disc in cooperation with each other according to an embodiment of the present invention;

[0039] Figure 7 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.

[0040] Reference numerals:

[0041] Vehicles: 10,000;

[0042] Brake 1000;

[0043] Piston 100, brake caliper 200, brake disc 300;

[0044] Limit seat 1, limiting structure N, first level limiting structure N1, second level limiting structure N2, third level limiting structure N3, fourth level limiting structure N4, fifth level limiting structure N5, positioning installation hole 11, first installation half groove 12, serration 13, chamfer 14;

[0045] The piston body 2, the second groove 21, the peripheral wall 22, and the accommodating chamber 221;

[0046] Compensation structure 3, limiting portion 31, limiting column 311, limiting elastic member 312, main body 32, first main body 321, first groove 3211, second main body 322, first section 3221, second section 3222, chamfered structure 3223;

[0047] Reset elastic member 4;

[0048] The clamp body 5, the piston chamber 51, and the positioning boss 52;

[0049] Brake pad 6;

[0050] Sealing ring 7;

[0051] Dust cover mounting groove 81, rectangular sealing ring mounting groove 82;

[0052] Leave a gap X. DETAILED DESCRIPTION

[0053] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0054] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] Combine the following Figure 1-Figure 7 A piston 100 , a brake 1000 having the piston 100 , and a vehicle 10000 having the brake 1000 according to an embodiment of the present invention will be described in detail.

[0056] Reference Figure 1-Figure 3 and Figure 6 As shown, the piston 100 according to the embodiment of the present invention includes a limiting seat 1, a piston body 2 and a compensation structure 3.

[0057] Among them, a multi-stage limiting structure N is provided on the limiting seat 1, and the piston body 2 can reciprocate in the first direction relative to the limiting seat 1 to participate in braking or returning; the compensation structure 3 can cooperate with the limiting structures N of different levels, and the piston body 2 and the compensation structure 3 can be connected by transmission to drive the compensation structure 3 to cooperate with the limiting structures N of different levels to compensate for the braking clearance. The multi-stage limiting structures N are arranged at intervals, so that the range of the braking clearance that can be compensated is larger.

[0058] When there is a need for braking, the hydraulic oil acts on the piston body 2 and applies a braking force to the piston body 2, the piston body 2 moves and pushes the brake pad 6, so that the braking force pushes the piston body 2 and the piston body 2 pushes the brake pad 6, the brake pad 6 is pushed until it contacts and rubs against the brake disc 300, and the purpose of braking is achieved. When the brake is canceled, the piston body 2 returns to its original position, and the brake pad 6 is separated from the brake disc 300 under the high-speed rotation of the brake disc 300, thereby canceling the brake.

[0059] It can be understood that “the piston body 2 participates in braking” means that the piston body 2 moves in a first direction toward the direction close to the brake pad 6. Figure 1-Figure 2 "The piston body 2 returns to its original position" means that the piston body 2 moves away from the brake pad 6 along the first direction, such as Figure 1-Figure 2 Move downward.

[0060] In the related art, during the use of the brake pad, the brake pad is half worn or even completely worn, and the brake pad needs to move a longer distance under the pressure of the piston body to be close to the brake disc. From the initial position to the pressing position where the brake pad is pressed against the brake disc, the moving distance of the piston body also increases, which leads to an increase in braking time, a longer braking distance, and an increase in the braking risk of the vehicle. In the present application, during braking, the brake pad 6 contacts the friction brake disc 300 under the push of the piston body 2. From the time the piston body 2 contacts the brake pad 6, the piston body 2 and the brake pad 6 move synchronously, that is, the distance moved by the brake pad 6 is the distance moved by the piston body 2. When the brake pad 6 is worn, the piston body 2 drives the compensation structure 3 to cooperate with a certain level of the limiting structure N, and the compensation structure 3 is repositioned and fixed. The compensation structure 3 compensates for the moving distance of the piston body 2, thereby avoiding the increase in the braking distance caused by the wear of the brake pad 6 and improving safety.

[0061] According to the piston 100 of the embodiment of the present invention, the piston body 2 is arranged to drive the compensation structure 3 to cooperate with the limiting structures N of different levels, so as to achieve compensation for the braking clearance, so that the braking clearance is within a reasonable range to improve safety.

[0062] In some embodiments of the present invention, the multi-stage limiting structures N are arranged at intervals along the first direction, and the first direction is the direction of reciprocating movement of the piston body. For example, the limiting structure N includes a first-stage limiting structure N1, a second-stage limiting structure N2, a third-stage limiting structure N3, a fourth-stage limiting structure N4, and a fifth-stage limiting structure N5. Of course, in some embodiments not shown in the figure, the limiting structure N can also be a two-stage, three-stage, four-stage, six-stage or more-stage limiting structure.

[0063] In some embodiments of the present invention, the limiting seat 1 is partially constructed as a sawtooth structure, and a limiting structure N is formed between two adjacent sawteeth 13 of the sawtooth structure. The sawtooth structure is a structure in which sawteeth 13 and recessed areas are arranged alternately, and the compensation structure 3 can be embedded in the recessed area. At the same time, the sawteeth 13 on both sides of the recessed area can block the compensation structure 3, thereby firmly limiting the compensation structure 3 in the recessed area. When the brake clearance needs to be compensated, the compensation structure 3 can go over the sawteeth 13 and enter another recessed area. The sawtooth structure can make the limiting effect of the limiting structure good.

[0064] In some embodiments of the present invention, reference Figure 1-Figure 2As shown, the sawtooth 13 has a chamfer 14 to guide the compensation structure 3 to be embedded in the limiting structure N, specifically to guide the compensation structure 3 to be embedded in the recessed area, thereby facilitating the embedding of the compensation structure 3 in the recessed area and preventing the sawtooth 13 from scratching the compensation structure 3. By providing the chamfer 14, the sawtooth 13 is configured as a wedge-shaped structure with a wide inner end and a narrow outer end, and the guiding effect is good.

[0065] In some embodiments of the present invention, the multi-stage limiting structure N includes at least a first-stage limiting structure and a last-stage limiting structure, and m-stage intermediate limiting structures are provided between the first-stage limiting structure and the last-stage limiting structure, where m≥0. Optionally, m can be 0, 1, 2, 3, 4, 5, 6, etc., and of course, m can also be other integers greater than 6. When m=0, the multi-stage limiting structure N is constructed as a two-stage limiting structure and includes a first-stage limiting structure and a last-stage limiting structure.

[0066] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, the compensation structure 3 includes a limiting portion 31, and the limiting portion 31 is suitable for limiting with different levels of limiting structures N. In this way, when the brake pad 6 is worn, the limiting portion 31 cooperates with a certain level of limiting structure N, so that the compensation structure 3 is repositioned and fixed, and the compensation structure 3 compensates for the moving distance of the piston body 2, thereby avoiding the increase of the braking distance caused by the wear of the brake pad 6 and improving safety.

[0067] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, the compensation structure 3 includes a limiting portion 31 and a main body portion 32, the main body portion 32 is drivably connected to the piston body 2, and the limiting portion 31 can move along the first direction driven by the main body portion 32, so that the limiting portion 31 cooperates with the limiting structures N of different levels. The limiting portion 31 can be movably mounted on the main body portion 32, thereby facilitating the limiting portion 31 to move relative to the main body portion 32 to a position that cooperates with the limiting structure N.

[0068] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, the limiting portion 31 can reciprocate in the second direction relative to the main body portion 32 so that the limiting portion 31 and the limiting structure N are in limiting engagement or disengagement. The second direction is perpendicular to the first direction. In other words, the angle between the second direction and the first direction is 90°. Specifically, the first direction is the axial direction of the limiting seat 1, and the second direction is the radial direction of the limiting seat 1.

[0069] In other embodiments, the angle between the second direction and the first direction may be other values ​​between 60° and 90°, for example, 60°, 70°, 80°, 85°, etc.

[0070] In some embodiments of the present invention, reference Figure 1-Figure 2As shown, when the piston body 2 drives the main body 32 to move along the first direction, the limiting portion 31 cooperates with the limiting seat 1 to make the limiting portion 31 reciprocate along the second direction.

[0071] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, the limiting part 31 includes a limiting column 311 and a limiting elastic member 312, and the limiting column 311 is movably connected to the main body 32 through the limiting elastic member 312. The limiting column 311 can be embedded in one of the first-level limiting structures N, and when the piston body 2 participates in braking, the limiting column 311 can be embedded and matched with the limiting structures N of different levels. Through the cooperation between the limiting column 311 and the limiting structures N of different levels, the compensation structure 3 can be fixed at different positions in the first direction. For example, the limiting column 311 can cooperate with the first-level limiting structure N1, and the position of the compensation structure 3 can be fixed at the first-level limiting structure N1; or, the limiting column 311 can cooperate with the second-level limiting structure N2, and the position of the compensation structure 3 can be fixed at the second-level limiting structure N2; or, the limiting column 311 can cooperate with the third-level limiting structure N3, and the position of the compensation structure 3 can be fixed at the third-level limiting structure N3; the limiting column 311 can cooperate with the fourth-level limiting structure N4, and the position of the compensation structure 3 can be fixed at the fourth-level limiting structure N4; the limiting column 311 can cooperate with the fifth-level limiting structure N5, and the position of the compensation structure 3 can be fixed at the fifth-level limiting structure N5. It should be noted that the multi-level limiting structures N are arranged at intervals along the first direction, and when the limiting column 311 cooperates with different levels of limiting structures N, the compensation structure 3 is located at different positions.

[0072] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, two adjacent levels of limiting structures are separated by saw teeth 13 , and the saw teeth 13 have chamfers 14 to guide the limiting column 311 to be embedded in the recessed area, thereby facilitating the embedding of the limiting column 311 in the recessed area and preventing the saw teeth 13 from scratching the limiting column 311 .

[0073] In some embodiments of the present invention, reference Figure 1-Figure 3 , Figure 5 As shown, there are multiple limiting portions 31, and the multiple limiting portions 31 are spaced apart in the circumferential direction of the piston 100. By providing multiple limiting portions 31, the reliability and stability of the compensation structure 3 can be improved.

[0074] In some embodiments of the present invention, reference Figure 1-Figure 3 , Figure 5 As shown, there are multiple limiting posts 311, and the multiple limiting posts 311 are spaced apart in the circumferential direction of the piston 100. By providing multiple limiting posts 311, the reliability and stability of the compensation structure 3 can be improved.

[0075] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, the main body 32 includes a first main body 321, and the first main body 321 is provided with a first groove 3211, and the limiting part 31 is adapted to be at least partially received in the first groove 3211. The limiting column 311 is guided and matched with the first groove 3211, and the limiting column 311 can move along the hole wall of the first groove 3211, and the limiting column 311 can be close to or away from the limiting seat 1. The first groove 3211 can guide the moving path of the limiting column 311, avoid the activity jam of the limiting column 311 and the separation of the limiting column 311 from the main body 32, thereby improving the reliability and stability of the matching between the limiting column 311 and the main body 32.

[0076] like Figure 1 and Figure 2 As shown, in some embodiments, the first groove 3211 extends along the second direction, and the limiting pillar 311 moves along the hole wall of the first groove 3211, that is, the limiting pillar 311 can also move along the second direction. When the limiting pillar 311 moves from a limiting structure N of a certain level to a limiting structure N of another level, the limiting pillar 311 needs to cooperate with a different limiting structure N in the first direction, and the limiting pillar 311 also moves in the first direction.

[0077] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, the limiting elastic member 312 is placed in the first groove 3211, one end of the limiting elastic member 312 abuts against the hole wall of the first groove 3211, and the other end of the limiting elastic member 312 abuts against the limiting column 311. The limiting elastic member 312 can apply elastic force to the limiting column 311, and under the action of the elastic force, the limiting column 311 can be embedded in the limiting structure N. By setting the limiting elastic member 312, the limiting column 311 can be continuously embedded in the limiting structure N. When the compensation structure 3 is repositioned, the limiting elastic member 312 can act on the limiting column 311, and the elastic force of the limiting elastic member 312 causes the limiting column 311 to be re-embedded in another limiting structure N without manual setting, thereby improving the stability of the cooperation between the limiting column 311 and the limiting structure N.

[0078] like Figure 1 and Figure 2 As shown, for example, the limiting elastic member 312 may be a limiting spring, and the limiting spring is always in a compressed state when acting on the limiting column 311 .

[0079] like Figure 1 and Figure 2As shown, in summary of the above embodiments, a limiting spring is provided between the limiting column 311 and the first groove 3211, the limiting spring acts on one end of the limiting column 311, and the other end of the limiting column 311 abuts against the limiting seat 1 under the action of the limiting spring. The limiting seat 1 has different levels of limiting structures N, and the limiting structures N of different levels are separated by saw teeth 13. In the radial direction of the limiting seat 1, the outer diameter of the saw teeth 13 is larger than the bottom diameter of the recessed area of ​​the limiting structure N. In the process of the limiting column 311 moving from the first level limiting structure N1 to the second level limiting structure N2, the limiting column 311 needs to pass through a saw tooth 13 in the first direction. The other end of the limiting column 311 abuts against the limiting seat 1. When the limiting column 311 passes through the sawtooth 13, the limiting column 311 compresses the limiting spring along the second direction. When the limiting column 311 is located at the second-level limiting structure N2, the limiting spring pushes the limiting column 311 along the second direction and makes the limiting column 311 embedded in the second-level limiting structure N2. When the limiting column 311 moves to be embedded with other levels of limiting structures N, the process is similar and will not be repeated here.

[0080] In the first direction, the total length from the first-stage limiting structure to the last-stage limiting structure is not greater than the maximum distance that the piston body 2 moves in the first direction.

[0081] like Figure 3 and Figure 5 As shown, for example, the limiting column 311 is arranged in the first groove 3211 of the compensation structure 3, the first groove 3211 also includes multiple, the limiting spring also includes multiple, and the limiting column 311, the first groove 3211 and the limiting spring correspond to each other one by one.

[0082] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, the body part 32 further includes a second body part 322 , the second body part 322 is connected to the first body part 321 , and the piston body 2 is drivingly connected to the second body part 322 .

[0083] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, the piston body 2 is provided with a second groove 21, and the second body portion 322 is partially disposed in the second groove 21. The groove wall of the second groove 21 can drive the second body portion 322 to move along the first direction. Specifically, during the movement of the piston body 2 along the first direction, when the groove wall of the second groove 21 abuts against the second body portion 322, the groove wall of the second groove 21 can drive the second body portion 322 to move along the first direction. For example, when the piston body 2 is involved in braking, the piston body 2 moves along the first direction toward the direction close to the brake pad 6, as shown in FIG. Figure 1-Figure 2 When the lower groove wall of the second groove 21 abuts against the second body portion 322 , the lower groove wall of the second groove 21 can drive the second body portion 322 to move upward.

[0084] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, the second body portion 322 includes a first section 3221, at least part of which is disposed in the second groove 21, and in the first direction, there is a gap between the first section 3221 and at least one side wall of the second groove 21, so that the first section 3221 can move along the first direction in the second groove 21. For example, the length of the second groove 21 in the first direction is greater than the length of the first section 3221 in the first direction.

[0085] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, the first section 3221 and the second groove 21 form a reserved gap X in the first direction.

[0086] Specifically, the first section 3221 is configured as an undercut claw, which is disposed in the second groove 21, and a reserved gap X is provided between the undercut claw and the second groove 21 in the first direction, and the undercut claw can move relative to the second groove 21 and the range of movement does not exceed the reserved gap X, so that the range in which the second groove 21 can move relative to the first section 3221 does not exceed the reserved gap X. The reserved gap X refers to the difference in size between the undercut claw and the second groove 21 in the first direction.

[0087] When the moving distance of the piston body 2 is less than the reserved gap X, the piston body 2 will not drive the main body 32 to move; when the brake pad 6 is worn and the moving distance of the piston body 2 exceeds the reserved gap X, the piston body 2 pulls the first section 3221 to move through the second groove 21, and accordingly, the limiting column 311 of the compensation structure 3 is separated from the original limiting structure N and repositioned to the new level of limiting structure N. According to the different degrees of wear of the brake pad 6 during use, the limiting column 311 can be repositioned accordingly. Therefore, when the braking demand is generated again, the moving distance of the piston body 2 does not exceed the reserved gap X.

[0088] For example, when the brake pad 6 is not worn, the limiting structure N is embedded in the first-level limiting structure N1, and the piston body 2 moves no more than the reserved gap X when participating in braking; when the brake pad 6 is worn, the piston body 2 moves a distance exceeding the reserved gap X when participating in braking, and the first section 3221 of the compensation structure 3 is pulled by the second groove 21 of the piston body 2, and the limiting column 311 of the compensation structure 3 is separated from the first-level limiting structure N1 and moves to be embedded with the second-level limiting structure N2. When the braking demand is generated again, the moving distance of the piston body 2 does not exceed the reserved gap X. Alternatively, when the brake pad 6 is severely worn, the limiting column 311 of the compensation structure 3 is separated from the first-level limiting structure N1 and moves to be embedded with the third-level limiting structure N3. Of course, the limiting column 311 can also be moved to the limiting structure N such as the fourth-level limiting structure N4, the fifth-level limiting structure N5, etc. to be embedded with the limiting structure N of this level.

[0089] When the brake pad 6 is worn, the limit column 311 cooperates with a certain level of the limit structure N, and the compensation structure 3 is repositioned and fixed. The compensation structure 3 compensates for the moving distance of the piston body 2, so that the moving distance of the piston body 2 and the brake pad 6 does not exceed the reserved gap X, which can avoid the braking distance being lengthened due to the wear of the brake pad 6 and improve safety.

[0090] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, the first section 3221 has a chamfered structure 3223 to guide the first section 3221 to be assembled into the second groove 21 , thereby facilitating the first section 3221 to be assembled into the second groove 21 and preventing the first section 3221 from scratching the groove wall of the second groove 21 .

[0091] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, the second body portion 322 further includes a second section 3222, the second section 3222 is fixedly connected to the first section 3221, and the size of the first section 3221 in the second direction is greater than the size of the second section 3222 in the second direction. Figure 1-Figure 2 In the specific example, the second direction is a direction perpendicular to the first direction, the first direction is an up-down direction, and the second direction is a left-right direction. The second section 3222 is located below the first section 3221, and the size of the second section 3222 in the left-right direction is smaller than the size of the first section 3221 in the left-right direction, thereby facilitating the first section 3221 to cooperate with the second groove 21.

[0092] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, the piston body 2 has a receiving cavity 221 with an opening at one end, and the limiting seat 1 is at least partially located in the receiving cavity 221. The second groove 21 is an undercut matching groove opened on the outer peripheral wall 22 of the piston body 2, and the first section 3221 is an undercut claw. The compensation structure 3 at least partially extends into the receiving cavity 221 to cooperate with the limiting structure N. For example, the end of the limiting column 311 can extend into the receiving cavity 221 to cooperate with the limiting structure N.

[0093] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, a part of the limiting seat 1 is arranged in the accommodating cavity 221 of the piston body 2, or the limiting seat 1 can be completely arranged in the accommodating cavity 221, and the structure of the piston 100 is more compact and the volume is smaller.

[0094] In some embodiments of the present invention, reference Figure 1-Figure 2As shown, the piston 100 further includes a reset elastic member 4, which is used to apply an elastic force to the piston body 2 to return the piston body 2. After the brake is canceled, the hydraulic oil is withdrawn, and the piston body 2 returns under the action of the reset elastic member 4. By providing the reset elastic member 4, the piston body 2 can return immediately after the brake is canceled, thereby improving the sensitivity of the brake.

[0095] For example, after the brake is released, the movement range of the piston body 2 does not exceed the reserved gap X, and the elastic force of the reset elastic member 4 is insufficient to cause the limiting column 311 and the limiting structure N to disengage.

[0096] In some embodiments of the present invention, reference Figure 1-Figure 2 As shown, one end of the reset elastic member 4 is connected to the piston body 2 , and the other end is connected to the limit seat 1 .

[0097] like Figure 1 and Figure 2 As shown, in some embodiments, the resetting elastic member 4 is a tension spring, which has high reliability and low cost, and is conducive to improving cost performance.

[0098] According to the piston 100 of the embodiment of the present invention, when the piston body 2 participates in braking, after the brake pad 6 is worn, the limiting column 311 can cooperate with another level of limiting structure N, and the compensation structure 3 is repositioned and fixed. The moving distance of the compensation structure 3 is the interval between the limiting structure N of this level and the limiting structure N of the previous level. The compensation structure 3 compensates for the moving distance of the piston body 2, so that the piston body 2 can participate in braking by moving a distance not exceeding the reserved gap X, thereby reducing the braking distance of the piston body 2 and improving safety.

[0099] like Figure 6 As shown, the brake 1000 according to the embodiment of the present invention includes a brake caliper 200 and the piston 100 of the above embodiment. The brake caliper 200 includes a caliper body 5, and a piston cavity 51 is formed on the caliper body 5. One end of the piston cavity 51 has an opening, and the piston 100 is installed in the piston cavity 51.

[0100] In some embodiments of the present invention, reference Figure 6 As shown, the brake 1000 also includes a brake disc 300, and the brake caliper 200 also includes a brake pad 6, which is installed on the caliper body 5, and the brake pad 6 can move back and forth in a first direction. The limit seat 1 is connected and fixed to the caliper body 5, and the limit seat 1 is located at the other end of the piston cavity 51. When the piston body 2 moves back and forth in the first direction, it passes through the opening of the piston cavity 51, and the piston body 2 can be close to or away from the brake pad 6.

[0101] When the piston body 2 reciprocates in the first direction, it is suitable to approach the brake pad 6 to push the brake pad 6 to brake the brake disc 300, or to move away from the brake pad 6 to separate the brake pad 6 from the brake disc 300. That is, when the piston body 2 reciprocates in the first direction, it can approach the brake pad 6 and then push the brake pad 6 to brake the brake disc 300, and it can also move away from the brake pad 6 to separate the brake pad 6 from the brake disc 300.

[0102] like Figure 2 As shown, for example, the piston body 2 can reciprocate in the first direction relative to the limit seat 1, and the piston body 2 can participate in braking or returning. When there is a braking demand, the hydraulic oil acts on the piston body 2 and applies a braking force to the piston body 2, the piston body 2 moves and pushes the brake pad 6, so that the braking force pushes the piston body 2 and the piston body 2 pushes the brake pad 6, and the brake pad 6 is pushed until it contacts and rubs against the brake disc 300, thereby achieving the purpose of braking the brake disc 300. When the brake is canceled, the piston body 2 returns, that is, the piston body 2 retreats into the piston cavity 51, and the brake pad 6 is separated from the brake disc 300 under the high-speed rotation of the brake disc 300, thereby canceling the brake. At the same time, from the moment the piston body 2 contacts the brake pad 6, the piston body 2 and the brake pad 6 move synchronously, that is, the distance moved by the piston body 2 is the distance moved by the brake pad 6, the movable distance of the piston body 2 in the piston chamber 51 is at least the reserved gap X, and the distance that the brake pad 6 can move is also at least the reserved gap X, so that there is a gap between the brake pad 6 and the brake disc 300, which avoids the brake pad 6 and the brake disc 300 being stuck due to close contact when the piston body 2 returns.

[0103] According to the brake 1000 of the embodiment of the present invention, by setting the above-mentioned piston 100, the piston body 2 pushes the brake pad 6 to move, and the movable distance of the piston body 2 in the piston chamber 51 is at least the reserved gap X, and the distance that the brake pad 6 can move is also at least the reserved gap X, so that there is a gap between the brake pad 6 and the brake disc 300, which avoids the brake pad 6 and the brake disc 300 being stuck when the piston body 2 returns. At the same time, when the piston body 2 participates in braking, when the brake pad 6 is worn, the limit column 311 can cooperate with another level of limit structure N, and the compensation structure 3 is repositioned and fixed. The moving distance of the compensation structure 3 is the interval between the limit structure N of this level and the limit structure N of the previous level. The compensation structure 3 compensates for the moving distance of the piston body 2, so that the piston body 2 can participate in braking when it moves no more than the reserved gap X, reducing the braking distance of the piston body 2 and improving safety.

[0104] In some embodiments of the present invention, one of the caliper body 5 and the limit seat 1 has a positioning boss 52, and the other has a positioning installation hole 11, and the positioning boss 52 is arranged in the positioning installation hole 11, thereby facilitating the connection and fixation of the caliper body 5 and the limit seat 1. Figure 2 and Figure 5 As shown, the clamp body 5 has a positioning boss 52 , the limiting seat 1 has a positioning installation hole 11 , and the positioning boss 52 is arranged in the positioning installation hole 11 .

[0105] like Figure 2 and Figure 5 As shown, in some embodiments, a sealing ring 7 is provided at the connection between the positioning boss 52 and the positioning installation hole 11. The cooperation between the positioning boss 52 and the positioning installation hole 11 can improve the reliability of the connection between the caliper body 5 and the limit seat 1; the sealing ring 7 is provided between the caliper body 5 and the limit seat 1, which can reduce the risk of oil leakage and facilitate installation.

[0106] For example, Figure 6 As shown, the brake 1000 includes a plurality of pistons 100 , and the plurality of pistons 100 are arranged in different piston chambers 51 of the same caliper body 5 .

[0107] Reference Figure 1 A first mounting half groove 12 is provided on the inner hole wall of the limit seat 1, and a second mounting half groove is provided on the outer peripheral wall of the positioning boss 52. The first mounting half groove 12 is buckled with the second mounting half groove to form a sealing ring mounting groove, and the sealing ring 7 is installed in the sealing ring mounting groove.

[0108] In the related art, the piston and the caliper body are installed with bolts, which increases the risk of oil leakage of the caliper body hydraulic oil under various working conditions such as vibration of the caliper body. In the present application, a sealing ring 7 is arranged between the caliper body 5 and the limit seat 1 to reduce the risk of oil leakage; at the same time, the caliper body 5 and the limit seat 1 are connected by the cooperation between the positioning protrusion 52 and the positioning installation hole 11, and the connection method is simpler and more reliable.

[0109] It should be further explained that the piston 100 of the present application can make specific targeted adjustments and settings to the reset elastic member 4, the piston body 2, and the limit seat 1 according to the needs of the vehicle model and the braking force of the project, so as to provide appropriate return force and structural dimensions matching the caliper body 5. Secondly, in order to match different types of brake pads 6, the piston 100 can make specific targeted changes by adjusting the size, pitch, etc. of the reset elastic member 4 and the number and spacing of the limit structures N on the limit seat 1; thirdly, in order to adapt to different types of brake calipers 200, according to the requirements of the braking force of the brake caliper 200, the piston 100 can be achieved by adjusting the cylinder diameter of the piston body 2 and making specific targeted changes to the reset elastic member 4. However, the structure and structural distribution of the piston 100 will not change much.

[0110] like Figure 7 As shown, a vehicle 10000 according to an embodiment of the present invention includes a brake 1000 according to an embodiment of the present invention.

[0111] According to the vehicle 10000 of the embodiment of the present invention, by setting the above-mentioned brake 1000, the piston body 2 pushes the brake pad 6 to move, and the movable distance of the piston body 2 in the piston chamber 51 is at least the reserved gap X, and the distance that the brake pad 6 can move is also at least the reserved gap X, so that there is a gap between the brake pad 6 and the brake disc 300, which avoids the brake pad 6 and the brake disc 300 being stuck when the piston body 2 returns. At the same time, when the piston body 2 participates in braking, when the brake pad 6 is worn, the limit column 311 can cooperate with another level of limit structure N, and the compensation structure 3 is repositioned and fixed. The moving distance of the compensation structure 3 is the interval between the limit structure N of this level and the limit structure N matched with the previous level. The compensation structure 3 compensates for the moving distance of the piston body 2, so that the piston body 2 can participate in braking when it moves no more than the reserved gap X, reducing the braking distance of the piston body 2 and improving safety.

[0112] According to the following Figure 1-Figure 7 A specific embodiment is described.

[0113] like Figure 1 and Figure 2 As shown, when the piston 100 has a braking demand, the braking force acts on the piston body 2 through the hydraulic oil, so that the piston body 2 pushes the brake pad 6 to contact and rub against the brake disc 300, thereby achieving the purpose of braking the brake disc 300. When the brake is canceled, the piston body 2 returns to its original position, and under the elastic force of the reset elastic member 4, the reset elastic member 4 quickly pulls the piston body 2 back to its original position, and the brake pad 6 can be separated from the brake disc 300 under the high-speed rotation of the brake disc 300, thereby canceling the brake.

[0114] like Figure 1 and Figure 2As shown, when the brake pad 6 is worn to a certain extent and a braking demand is generated again, the movement distance of the piston body 2 exceeds the reserved gap X, and the undercut matching groove of the piston body 2 pulls the undercut claw of the compensation structure 3 to move, and the limiting column 311 of the compensation structure 3 moves synchronously and disengages from the previous limiting structure N. In this process, the limiting column 311 compresses the limiting spring, causing the limiting spring to retract. When reaching the next level of limiting structure N, the limiting spring returns and pushes the limiting column 311 into the limiting structure N. When the braking demand is completed, the piston body 2 returns under the action of the reset elastic member 4, and the interval between the piston body 2 and the brake pad 6 increases, so that the piston body 2 is separated from the brake pad 6, and the brake pad 6 is separated from the brake disc 300 under the high-speed rotation of the brake disc 300, thereby canceling the brake. When the piston body 2 is against the reverse claw, the reverse claw tends to move to the bottom of the piston chamber 51. Since the limit column 311 is stuck in the first groove 3211 under the action of the limit spring, the reverse claw cannot move to the bottom of the piston chamber 51, so that the piston body 2 stops returning to its original position, ensuring that the distance between the piston body 2 and the brake pad 6 is within a certain range, thereby avoiding the increase in braking time and braking distance caused by the wear of the brake pad 6, reducing the braking risk of the vehicle 10000 and ensuring the safety of the driver and passengers.

[0115] like Figure 1 As shown, the positioning boss 52 in the piston cavity 51 is integrally cast with the caliper body 5, and the limit seat 1 and the positioning boss 52 are connected by a sealing ring 7 (such as a rubber ring, a silicone ring), so the installation is simple and reliable.

[0116] like Figure 2 and Figure 3 As shown, the piston body 2 is also provided with a dust cover installation groove 81, which can be installed with a dust cover to reduce dust; the piston body 2 is provided with a rectangular sealing ring installation groove 82 for installing a rectangular sealing ring, thereby improving the sealing ability of the piston body 2.

[0117] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0118] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0119] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0120] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A piston (100), characterized in that: include: A limiting seat (1), wherein the limiting seat (1) is provided with a multi-stage limiting structure (N); A piston body (2), wherein the piston body (2) is capable of reciprocating in a first direction relative to the limiting seat (1) to participate in braking or returning; A compensation structure (3), wherein the compensation structure (3) can cooperate with the limiting structures (N) at different levels in a limiting manner; The piston body (2) and the compensation structure (3) can be transmission-connected to drive the compensation structure (3) to cooperate with the limiting structures (N) at different levels to compensate for the braking clearance.

2. The piston (100) according to claim 1, characterized in that The multi-stage limiting structures (N) are arranged at intervals along the first direction.

3. The piston (100) according to claim 2, characterized in that The limiting seat (1) is partially constructed as a sawtooth structure, and the limiting structure (N) is formed between two adjacent saw teeth (13) of the sawtooth structure.

4. The piston (100) according to claim 3, characterized in that The saw teeth (13) have chamfers (14) to guide the compensation structure (3) to be embedded in the limiting structure (N).

5. The piston (100) according to claim 1, characterized in that: The compensation structure (3) comprises a limiting portion (31) and a main body portion (32); the main body portion (32) is drivably connected to the piston body (2); the limiting portion (31) can move along the first direction driven by the main body portion (32) so that the limiting portion (31) cooperates with the limiting structures (N) of different levels.

6. The piston (100) according to claim 5, characterized in that The limiting portion (31) can reciprocate in a second direction relative to the main body (32) so that the limiting portion (31) and the limiting structure (N) are in limiting engagement or out of limiting engagement, and the second direction is perpendicular to the first direction.

7. The piston (100) according to claim 6, characterized in that When the piston body (2) drives the main body (32) to move along the first direction, the limiting portion (31) cooperates with the limiting seat (1) to enable the limiting portion (31) to reciprocate along the second direction.

8. The piston (100) according to claim 6, characterized in that The limiting portion (31) comprises a limiting column (311) and a limiting elastic member (312), and the limiting column (311) is movably connected to the main body (32) via the limiting elastic member (312).

9. The piston (100) according to claim 6, characterized in that There are a plurality of the limiting portions (31), and the plurality of limiting portions (31) are spaced apart in the circumferential direction of the piston body (2).

10. The piston (100) according to claim 5, characterized in that The main body portion (32) comprises a first main body portion (321), the first main body portion (321) is provided with a first groove (3211), and the limiting portion (31) is suitable for being at least partially received in the first groove (3211).

11. The piston (100) according to claim 10, characterized in that The main body part (32) further comprises a second main body part (322), the second main body part (322) being connected to the first main body part (321), and the piston body (2) being drivingly connected to the second main body part (322).

12. The piston (100) according to claim 11, characterized in that The piston body (2) is provided with a second groove (21), and the second body portion (322) is partially arranged in the second groove (21). The groove wall of the second groove (21) can drive the second body portion (322) to move along the first direction.

13. The piston (100) according to claim 12, characterized in that The second main body portion (322) includes a first section (3221), at least part of which is disposed in the second groove (21), and in the first direction, there is a gap between the first section (3221) and at least one side wall of the second groove (21), so that the first section (3221) can move in the second groove (21) along the first direction.

14. The piston (100) according to claim 13, characterized in that The first section (3221) has a chamfered structure (3223) to guide the first section (3221) to be assembled into the second groove (21).

15. The piston (100) according to claim 1, characterized in that The piston body (2) has a receiving cavity (221) with an opening at one end, and the limiting seat (1) is at least partially located in the receiving cavity (221).

16. The piston (100) according to claim 1, characterized in that The piston (100) further comprises a resetting elastic member (4), wherein the resetting elastic member (4) is used to apply an elastic force to the piston body (2) so as to return the piston body (2) to its original position.

17. The piston (100) according to claim 16, characterized in that One end of the resetting elastic member (4) is connected to the piston body (2), and the other end is connected to the limiting seat (1).

18. A brake (1000), characterized in that: The invention comprises a brake caliper (200) and a piston (100) according to any one of claims 1 to 17, wherein the brake caliper (200) comprises a caliper body (5), a piston cavity (51) is provided on the caliper body (5), and the piston (100) is installed in the piston cavity (51).

19. The brake (1000) according to claim 18, characterized in that The brake (1000) further comprises a brake disc (300), and the brake caliper (200) further comprises a brake pad (6), wherein the brake pad (6) is mounted on the caliper body (5) and is capable of reciprocating along the first direction; The limit seat (1) is connected and fixed to the caliper body (5), and the piston body (2) is suitable for approaching the brake pad (6) to push the brake pad (6) to brake the brake disc (300) or moving away from the brake pad (6) to separate the brake pad (6) from the brake disc (300) when moving back and forth in the first direction.

20. The brake (1000) according to claim 19, characterized in that One of the clamp body (5) and the limiting seat (1) has a positioning boss (52), and the other has a positioning installation hole (11), and the positioning boss (52) is arranged in the positioning installation hole (11).

21. A vehicle (10000), characterized in that: A brake (1000) comprising any one of claims 18-20.

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