Piston, brake and vehicle

Abstract

The application discloses a piston, a brake and a vehicle. The piston comprises a limiting seat, a piston body and a compensation structure, the limiting seat is provided with a plurality of limiting structures, the piston body can reciprocate in a first direction relative to the limiting seat to participate in braking or return, and the compensation structure can be limitedly matched with the limiting structures of different levels; the piston body and the compensation structure are in driving connection to drive the compensation structure to be matched with the limiting structures of different levels to compensate for a brake gap. The piston can compensate for the brake gap by driving the compensation structure to be limitedly matched with the limiting structures of different levels, so that the brake gap is within a reasonable range, and safety is improved.

Description

TECHNICAL FIELD

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

[0002] In the related art, the piston body of the piston presses the brake pad, when the piston body is at the pressing position, the brake pad is pressed by the piston body until it is tightly attached to the brake disc, thereby the brake pad brakes the brake disc; after the brake is cancelled, the piston body returns to the initial position under the action of the spring, the pressing of the brake pad is released, and the brake pad can be separated from the brake disc.

[0003] However, during use, the brake pad is half-worn or even fully-worn, and the brake pad needs to move a longer distance to tightly attach to the brake disc under the pressing of the piston body. The moving distance of the piston body from the initial position to the pressing position where the brake pad tightly attaches to the brake disc also increases, thereby increasing the brake gap, brake time and brake distance, and increasing the brake risk of the vehicle.

[0004] Therefore, there is room for improvement. SUMMARY

[0005] The present application aims to at least partially solve one of the above technical problems in the prior art. To this end, the present application provides a piston which can compensate for the brake gap.

[0006] The present application also provides a brake having the above piston.

[0007] The present application also provides a vehicle.

[0008] The piston according to the embodiments of the present application comprises a limiting seat, a piston body and a compensation structure, the limiting seat is provided with a plurality of limiting structures, the piston body can reciprocate in a first direction relative to the limiting seat to participate in braking or return, and the compensation structure can be limitedly matched with different levels of the limiting structure; the piston body and the compensation structure are in driving connection to drive the compensation structure to match with different levels of the limiting structure to compensate for the brake gap.

[0009] The piston according to the embodiments of the present application can compensate for the brake gap by driving the compensation structure to match with different levels of the limiting structure, so that the brake gap is within a reasonable range to improve safety.

[0010] According to some embodiments of the present application, the plurality of limiting structures are arranged at intervals along the first direction.

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

[0012] According to some embodiments of the present application, the sawtooth is chamfered to guide the embedding of the compensation structure into the limiting structure.

[0013] According to some embodiments of the present application, the compensation structure comprises a limiting portion and a body portion, the body portion is drivingly connected with the piston body, and the limiting portion is movable along the first direction under the driving of the body portion to cooperate with the limiting structure of different levels.

[0014] According to some embodiments of the present application, the limiting portion is reciprocally movable relative to the body portion along a second direction to be in limiting cooperation or out of limiting cooperation with the limiting structure, and the second direction is perpendicular to the first direction.

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

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

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

[0018] According to some embodiments of the present application, the body portion comprises a first body portion, the first body portion is provided with a first recess, and the limiting portion is adapted to be at least partially accommodated in the first recess.

[0019] According to some embodiments of the present application, the body portion further comprises a second body portion, the second body portion is connected with the first body portion, and the piston body is drivingly connected with the second body portion.

[0020] According to some embodiments of the present application, the piston body is provided with a second recess, the second body portion is partially arranged in the second recess, and a groove wall of the second recess is capable of driving the second body portion to move along the first direction.

[0021] According to some embodiments of the present application, the second body portion comprises a first section, at least part of the first section is arranged in the second recess, and in the first direction, the first section has a gap with at least one side wall of the second recess to enable the first section to move along the first direction in the second recess.

[0022] According to some embodiments of the present application, the first section has a chamfered structure to guide the assembly of the first section to the second groove.

[0023] According to some embodiments of the present application, the piston body has an open-ended receiving cavity, and the limit seat is at least partially located in the receiving cavity.

[0024] According to some embodiments of the present application, the piston further comprises a reset elastic member for applying an elastic force to the piston body to reset the piston body.

[0025] According to some embodiments of the present application, one end of the reset elastic member is connected to the piston body, and the other end is connected to the limit seat.

[0026] The brake according to the embodiments of the present application comprises the brake caliper and the above-mentioned piston, and the brake caliper comprises a caliper body having a piston cavity, and the piston is installed in the piston cavity.

[0027] The brake according to the embodiments of the present application, the piston of which is limitedly matched with limit structures of different levels by the compensation structure carried by the piston body, can compensate the brake clearance, so that the brake clearance is within a reasonable range, thereby improving the safety.

[0028] According to some embodiments of the present application, the brake further comprises a brake disc, and the brake caliper further comprises a brake pad, which is installed on the caliper body and can reciprocate along the first direction; the limit seat is fixedly connected with the caliper body, and the piston body is adapted to approach the brake pad to push the brake pad to brake the brake disc, or to move away from the brake pad to separate the brake pad from the brake disc when the piston body reciprocates along the first direction.

[0029] According to some embodiments of the present application, one of the caliper body and the limit seat has a positioning protrusion, and the other has a positioning mounting hole, and the positioning protrusion is arranged in the positioning mounting hole.

[0030] The vehicle according to the embodiments of the present application comprises the brake according to the embodiments of the present application.

[0031] The vehicle according to the embodiments of the present application, the piston of the brake of which is limitedly matched with limit structures of different levels by the compensation structure carried by the piston body, can compensate the brake clearance, so that the brake clearance is within a reasonable range, thereby improving the safety.

[0032] Additional aspects and advantages of the present application will be given, partially in the following description, partially will become obvious from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

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

[0034] Figure 2 is a sectional view of a piston cooperating with a caliper according to an embodiment of the present application;

[0035] Figure 3 is a schematic view of a piston according to an embodiment of the present application from one perspective;

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

[0037] Figure 5 is a schematic view of a piston according to an embodiment of the present application from yet another perspective;

[0038] Figure 6 is a sectional view of a brake caliper cooperating with a brake disc according to an embodiment of the present application;

[0039] Figure 7 is a schematic view of a vehicle according to an embodiment of the present application.

[0040] Reference signs:

[0041] Vehicle 10000;

[0042] Brake 1000;

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

[0044] Limiting seat 1, limiting structure N, first-stage limiting structure N1, second-stage limiting structure N2, third-stage limiting structure N3, fourth-stage limiting structure N4, fifth-stage limiting structure N5, positioning mounting hole 11, first mounting half-groove 12, sawtooth 13, chamfer 14;

[0045] Piston body 2, second groove 21, outer peripheral wall 22, accommodating cavity 221;

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

[0047] Reset elastic member 4;

[0048] Caliper body 5, piston cavity 51, positioning protruding column 52;

[0049] Brake pad 6;

[0050] Sealing ring 7;

[0051] The dust cover mounting groove 81 and the rectangular sealing ring mounting groove 82;

[0052] The reserved gap X. DETAILED DESCRIPTION

[0053] Embodiments of the present application are described below in detail with reference to the accompanying drawings, in which the same or similar numerals represent the same or similar elements or elements having the same or similar functions throughout the drawings. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0054] In the description of the present application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0055] The following will be described in detail Figures 1-7 The piston 100 according to the embodiments of the present application, the brake 1000 having the piston 100, and the vehicle 10000 having the brake 1000 are described in detail.

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

[0057] The limiting seat 1 is provided with a plurality of limiting structures N, the piston body 2 is reciprocally movable in a first direction relative to the limiting seat 1 to participate in braking or return; the compensation structure 3 is capable of limiting cooperation with different levels of limiting structures N, and the piston body 2 is drivingly connected with the compensation structure 3 to drive the compensation structure 3 to cooperate with different levels of limiting structures N to compensate for the brake clearance. The plurality of limiting structures N are arranged at intervals, so that the range of brake clearance that can be compensated is larger.

[0058] 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, the brake pad 6 is pushed until it contacts and rubs with the brake disc 300, achieving the purpose of braking. When the brake is cancelled, the piston body 2 returns, and the brake pad 6 is separated from the brake disc 300 under the high-speed rotation of the brake disc 300, so that the brake is cancelled.

[0059] It can be understood that "the piston body 2 participates in braking" means that the piston body 2 moves in the first direction towards the direction close to the brake pad 6, such asFigures 1-2 moves upward. The "piston body 2 back position" refers to the movement of the piston body 2 in the first direction to the direction away from the brake pad 6, such as Figures 1-2 moves downward.

[0060] In the related art, the brake pad is half-worn or even fully worn during use, and the brake pad needs to move a longer distance to closely contact the brake disc under the pressing of the piston body. The movement distance of the piston body from the initial position to the pressing position where the brake pad closely contacts the brake disc also increases, thereby increasing the braking time and the braking distance, and increasing the braking risk of the vehicle. In the present application, during braking, the brake pad 6 contacts and rubs the brake disc 300 under the pushing of the piston body 2. From the contact between the piston body 2 and the brake pad 6, the piston body 2 and the brake pad 6 move synchronously, that is, the movement distance of the brake pad 6 is the movement distance of the piston body 2. When the brake pad 6 is worn, the piston body 2 drives the compensation structure 3 to cooperate with the limit structure N of a certain level, the compensation structure 3 is repositioned and fixed, and the compensation structure 3 compensates the movement 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 the safety.

[0061] The piston 100 according to the embodiment of the present application can compensate the brake clearance by setting the piston body 2 to drive the compensation structure 3 to limit and cooperate with the limit structure N of different levels, so that the brake clearance is within a reasonable range, thereby improving the safety.

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

[0063] In some embodiments of the present application, the limit seat 1 is partially structured as a sawtooth structure, and the adjacent two sawteeth 13 of the sawtooth structure form the limit structure N. The sawtooth structure is a structure in which the sawteeth 13 and the recessed areas are alternately arranged, the compensation structure 3 can be embedded in the recessed area, and at the same time, the sawteeth 13 on both sides of the recessed area can block the compensation structure 3, thereby stably limiting the compensation structure 3 in the recessed area. When it is necessary to compensate the brake clearance, the compensation structure 3 can pass through the sawteeth 13 and enter another recessed area. The sawtooth structure can make the limit effect of the limit structure good.

[0064] In some embodiments of the present application, with reference to Figures 1-2As shown, the sawtooth 13 has a chamfer 14 to guide the embedding of the compensation structure 3 into the limiting structure N, specifically to guide the embedding of the compensation structure 3 into the recessed area, thereby facilitating the embedding of the compensation structure 3 into the recessed area and avoiding scratching the compensation structure 3 by the sawtooth 13. 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, achieving good guiding effect.

[0065] In some embodiments of the present application, the multi-stage limiting structure N includes at least a first stage limiting structure and a last stage limiting structure, and m intermediate limiting structures are arranged 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. Of course, m can also be other integers greater than 6. When m=0, the multi-stage limiting structure N is configured as a two-stage limiting structure and includes the first stage limiting structure and the last stage limiting structure.

[0066] In some embodiments of the present application, referring to Figures 1-2 As shown, the compensation structure 3 includes a limiting portion 31 adapted to limitingly cooperate with the limiting structures N of different stages. In this way, when the brake pad 6 is worn, the limiting portion 31 cooperates with a limiting structure N of a certain stage, so that the compensation structure 3 is repositioned and fixed, and the compensation structure 3 compensates for the movement distance of the piston body 2, thereby avoiding the increase in braking distance caused by the wear of the brake pad 6 and improving safety.

[0067] In some embodiments of the present application, referring to Figures 1-2 As shown, the compensation structure 3 includes a limiting portion 31 and a body portion 32, the body portion 32 is drivingly connected with the piston body 2, and the limiting portion 31 is movable along a first direction under the driving of the body portion 32 to cooperate with the limiting structures N of different stages. The limiting portion 31 is movably mounted on the body portion 32, thereby facilitating the movement of the limiting portion 31 relative to the body portion 32 to a position cooperating with the limiting structure N.

[0068] In some embodiments of the present application, referring to Figures 1-2 As shown, the limiting portion 31 is reciprocally movable relative to the body portion 32 in a second direction to limitingly cooperate with or disengage from the limiting structure N, the second direction being perpendicular to the first direction, in other words, the included 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 included angle between the second direction and the first direction can be other values between 60° and 90°, for example, 60°, 70°, 80°, 85°, etc.

[0070] In some embodiments of the present application, referring to Figures 1-2As shown, when the piston body 2 drives the body part 32 to move in the first direction, the limiting part 31 cooperates with the limiting seat 1 to make the limiting part 31 reciprocate in the second direction.

[0071] In some embodiments of the present application, referring to Figures 1-2 As shown, the limiting part 31 comprises a limiting column 311 and a limiting elastic member 312, and the limiting column 311 is movably connected with the body part 32 through the limiting elastic member 312. The limiting column 311 can be embedded in one of the limiting structures N, and when the piston body 2 participates in braking, the limiting column 311 can be embedded in cooperation with different levels of limiting structures N. Through the cooperation of the limiting column 311 and different levels of limiting structures N, 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 multiple levels of limiting structures N are arranged at intervals in 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 application, referring to Figures 1-2 As shown, the adjacent two levels of limiting structures are separated by the sawtooth 13, and the sawtooth 13 has a chamfer 14 to guide the embedding of the limiting column 311 into the recessed area, thereby facilitating the embedding of the limiting column 311 into the recessed area and avoiding scratching the limiting column 311 by the sawtooth 13.

[0073] In some embodiments of the present application, referring to Figures 1-3 , Figure 5 As shown, the limiting part 31 is multiple, and the multiple limiting parts 31 are spaced apart in the circumferential direction of the piston 100. By providing multiple limiting parts 31, the reliability and stability of the compensation structure 3 can be improved.

[0074] In some embodiments of the present application, referring to Figures 1-3 , Figure 5 As shown, the limiting column 311 is multiple, and the multiple limiting columns 311 are spaced apart in the circumferential direction of the piston 100. By providing multiple limiting columns 311, the reliability and stability of the compensation structure 3 can be improved.

[0075] In some embodiments of the present application, referring toFigures 1-2 As shown, the body part 32 comprises a first body part 321 provided with a first groove 3211, and the limiting part 31 is adapted to be at least partially accommodated in the first groove 3211. The limiting column 311 is guided by the first groove 3211 and 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 movement path of the limiting column 311, avoid the movement jam of the limiting column 311 and the disengagement of the limiting column 311 from the body part 32, thereby improving the reliability and stability of the cooperation between the limiting column 311 and the body part 32.

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

[0077] In some embodiments of the present application, referring to Figures 1-2 As shown, the limiting elastic member 312 is arranged 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 an 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 arranging the limiting elastic member 312, the limiting column 311 can be continuously embedded in the limiting structure N, and 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 makes the limiting column 311 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] As shown in Figure 1 and Figure 2 for example, the limiting elastic member 312 can be a limiting spring, which is always in a compressed state when acting on the limiting column 311.

[0079] As shown in Figure 1 and Figure 2As shown in the above embodiments, a limiting spring is provided between the limiting post 311 and the first groove 3211. The limiting spring acts on one end of the limiting post 311, and the other end of the limiting post 311 abuts against the limiting seat 1 under the action of the limiting spring. The limiting seat 1 has limiting structures N of different levels, which are separated by serrations 13. In the radial direction of the limiting seat 1, the outer diameter of the serrations 13 is larger than the bottom diameter of the recessed area of ​​the limiting structure N. During the process of the limiting post 311 moving from the first-level limiting structure N1 to the second-level limiting structure N2, the limiting post 311 needs to pass through a serration 13 in the first direction. The other end of the limiting post 311 abuts against the limiting seat 1. When the limiting post 311 passes through the sawtooth 13, it compresses the limiting spring in the second direction. When the limiting post 311 is located in the second-level limiting structure N2, the limiting spring pushes the limiting post 311 in the second direction, causing it to be embedded in the second-level limiting structure N2. The process is similar when the limiting post 311 moves to be embedded in other levels of limiting structures N, and will not be described in detail 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 can move in the first direction.

[0081] like Figure 3 and Figure 5 As shown, for example, the limiting post 311 is disposed in the first groove 3211 of the compensation structure 3. The first groove 3211 also includes multiple ones, and the limiting spring also includes multiple ones. The limiting post 311, the first groove 3211 and the limiting spring correspond one-to-one.

[0082] In some embodiments of the present invention, reference is made to... Figures 1-2 As shown, the main body 32 also includes a second main body 322, which is connected to the first main body 321, and the piston body 2 is connected to the second main body 322 in a transmission manner.

[0083] In some embodiments of the present invention, reference is made to... Figures 1-2 As shown, the piston body 2 has a second groove 21, and a second body portion 322 is partially disposed within the second groove 21. The groove wall of the second groove 21 can drive the second body portion 322 to move along a 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 engages in braking, the piston body 2 moves along the first direction toward the brake pad 6, such as... Figures 1-2 When the second groove 21 moves upward, and the lower groove wall of the second groove 21 comes into contact with the second body part 322, the lower groove wall of the second groove 21 can drive the second body part 322 to move upward.

[0084] In some embodiments of the present application, referring to Figures 1-2 As shown, the second body part 322 includes a first section 3221, at least part of the first section 3221 is arranged in the second groove 21, and in the first direction, the first section 3221 has a gap with at least one side wall of the second groove 21, so that the first section 3221 can move in the first direction within 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 application, referring to Figures 1-2 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 a reverse buckle, which is arranged in the second groove 21, and has a reserved gap X with the second groove 21 in the first direction. The reverse buckle can move relative to the second groove 21 and the range of movement does not exceed the reserved gap X, so that the range of movement of the second groove 21 relative to the first section 3221 does not exceed the reserved gap X. The reserved gap X refers to the difference between the size of the reverse buckle and the size of the second groove 21 in the first direction.

[0087] When the movement distance of the piston body 2 is less than the reserved gap X, the piston body 2 will not move the body part 32; when the brake pad 6 is worn and the movement 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 correspondingly, the limiting column 311 of the compensation structure 3 is disengaged from the original limiting structure N and repositioned to the limiting structure N of the new level. According to the different wear degrees of the brake pad 6 in use, the limiting column 311 can be repositioned accordingly. Thus, when the braking demand occurs again, the movement 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 a distance not exceeding 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 disengaged from the first level limiting structure N1 and moves to be embedded with the second level limiting structure N2. When the braking demand occurs again, the movement distance of the piston body 2 does not exceed the reserved gap X. Alternatively, when the brake pad 6 is worn seriously, the limiting column 311 of the compensation structure 3 is disengaged 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 move to 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 limiting column 311 cooperates with the limiting structure N of a certain level, the compensation structure 3 is repositioned and fixed, the compensation structure 3 compensates the movement distance of the piston body 2, so that the movement distance of the piston body 2 and the brake pad 6 does not exceed the reserved gap X, the brake distance caused by the wear of the brake pad 6 can be avoided, and the safety is improved.

[0090] In some embodiments of the present application, referring to Figures 1-2 As shown in the figure, the first section 3221 has a chamfer structure 3223 to guide the assembly of the first section 3221 to the second groove 21, so that the assembly of the first section 3221 to the second groove 21 is facilitated, and the slot wall of the second groove 21 is prevented from being scratched by the first section 3221.

[0091] In some embodiments of the present application, referring to Figures 1-2 As shown in the figure, the second body part 322 further includes a second section 3222, the second section 3222 is fixedly connected with 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. Figures 1-2 In the specific example, the second direction is perpendicular to the first direction, the first direction is the up-down direction, and the second direction is the 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, so that the first section 3221 cooperates with the second groove 21.

[0092] In some embodiments of the present application, referring to Figures 1-2 As shown in the figure, the piston body 2 has an open accommodating cavity 221 at one end, and the limiting seat 1 is at least partially located in the accommodating cavity 221. The second groove 21 is a reverse-docking groove formed on the outer peripheral wall 22 of the piston body 2, and the first section 3221 is a reverse-docking claw. The compensation structure 3 at least partially extends into the accommodating cavity 221 to limit and cooperate with the limiting structure N. For example, the end of the limiting column 311 can extend into the accommodating cavity 221 to limit and cooperate with the limiting structure N.

[0093] In some embodiments of the present application, referring to Figures 1-2 As shown in the figure, 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 entirely arranged in the accommodating cavity 221, so that the structure of the piston 100 is more compact and the volume is smaller.

[0094] In some embodiments of the present application, referring to Figures 1-2As shown, the piston 100 further comprises a reset elastic member 4, which is used to apply an elastic force to the piston body 2 to reset the piston body 2. After the brake is cancelled, the hydraulic oil is removed, and the piston body 2 is reset under the action of the reset elastic member 4. By arranging the reset elastic member 4, the piston body 2 can be reset immediately after the brake is cancelled, and the sensitivity of the brake is improved.

[0095] For example, after the brake is cancelled, the piston body 2 moves within the range of the reserved gap X, and the elastic force of the reset elastic member 4 is insufficient to disengage the limiting column 311 from the limiting structure N.

[0096] In some embodiments of the present application, referring to Figures 1-2 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 limiting seat 1.

[0097] As shown in Figure 1 and Figure 2 In some embodiments, the reset elastic member 4 is a tension spring, which has high reliability and low cost, and is beneficial to improve the cost performance.

[0098] According to the piston 100 of the embodiment of the present application, when the brake pad 6 is worn after participating in braking, the limiting column 311 can be engaged with the limiting structure N of another level, the compensation structure 3 is repositioned and fixed, the movement distance of the compensation structure 3 is the interval between the limiting structure N of this level and the limiting structure N of the upper level, the compensation structure 3 compensates the movement distance of the piston body 2, so that the piston body 2 can participate in braking within the distance of the reserved gap X, the braking distance of the piston body 2 is reduced, and the safety is improved.

[0099] As shown in Figure 6 The brake 1000 according to the embodiment of the present application comprises the brake caliper 200 and the piston 100 of the above-mentioned embodiment, the brake caliper 200 comprises the caliper body 5, the piston cavity 51 is arranged 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 application, referring to Figure 6 As shown, the brake 1000 further comprises the brake disc 300, the brake caliper 200 further comprises the brake pad 6, the brake pad 6 is installed on the caliper body 5, and the brake pad 6 can reciprocate in the first direction, the limiting seat 1 is fixedly connected to the caliper body 5, the limiting seat 1 is located at the other end of the piston cavity 51, the piston body 2 passes through the opening of the piston cavity 51 when reciprocating in the first direction, and the piston body 2 can approach or move away from the brake pad 6.

[0101] When the piston body 2 reciprocates in the first direction, it is adapted to move closer to 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 move closer to the brake pad 6 to push the brake pad 6 to brake the brake disc 300, or it can 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 relative to the limiting seat 1 in a first direction. The piston body 2 can participate in braking or return to its original position. When braking is required, hydraulic oil acts on the piston body 2 and applies braking force to it. The piston body 2 moves and pushes the brake pad 6, thereby the braking force pushes the piston body 2 and pushes the brake pad 6 until it comes into contact with the brake disc 300, achieving the purpose of braking the brake disc 300. When braking is released, the piston body 2 returns to its original position, that is, the piston body 2 retracts into the piston cavity 51, and the brake pad 6 disengages from the brake disc 300 under the high-speed rotation of the brake disc 300, thereby releasing the braking. 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 the piston body 2 moves is the same as the distance the brake pad 6 moves. The movable distance of the piston body 2 in the piston cavity 51 is at least the reserved gap X, and the movable distance of the brake pad 6 is also at least the reserved gap X. Thus, 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 from sticking together and getting stuck when the piston body 2 returns to its original position.

[0103] According to the brake 1000 of the present invention, by setting the piston 100 described above, the piston body 2 pushes the brake pad 6 to move. The movable distance of the piston body 2 in the piston cavity 51 is at least the reserved gap X, and the movable distance of the brake pad 6 is also at least the reserved gap X. Thus, there is a gap between the brake pad 6 and the brake disc 300, avoiding the situation where the brake pad 6 and the brake disc 300 are tightly attached and jammed when the piston body 2 returns to its original position. At the same time, when the piston body 2 participates in braking, after the brake pad 6 wears, the limiting post 311 can cooperate with another limiting structure N of a certain stage. The compensation structure 3 is repositioned and fixed. The moving distance of the compensation structure 3 is the gap between the limiting structure N of this stage and the limiting structure N of the previous stage. The compensation structure 3 compensates for the moving distance of the piston body 2, so that the piston body 2 can participate in braking without moving more than the reserved gap X, thereby reducing the braking distance of the piston body 2 and improving safety.

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

[0105] As shown in the drawings, Figure 2 and Figure 5 In some embodiments, a sealing ring 7 is arranged at the connection and matching position of the positioning protrusion 52 and the positioning mounting hole 11. The matching between the positioning protrusion 52 and the positioning mounting hole 11 can improve the reliability of the connection of the caliper body 5 and the limiting seat 1, and the arrangement of the sealing ring 7 between the caliper body 5 and the limiting seat 1 can reduce the risk of oil leakage and facilitate installation.

[0106] For example, as shown in the drawings, Figure 6 The brake 1000 includes a plurality of pistons 100 arranged in different piston cavities 51 of the same caliper body 5.

[0107] Referring to Figure 1 , a first mounting half groove 12 is arranged on the inner hole wall of the limiting seat 1, a second mounting half groove is arranged on the outer peripheral wall of the positioning protrusion 52, the first mounting half groove 12 and the second mounting half groove are buckled to form a sealing ring mounting groove, and the sealing ring 7 is arranged in the sealing ring mounting groove.

[0108] In the related art, the pistons and the caliper body are bolted, and in various working conditions such as vibration of the caliper body, the risk of leakage of hydraulic oil of the caliper body is increased. In the present application, the sealing ring 7 is arranged between the caliper body 5 and the limiting seat 1 to reduce the risk of oil leakage, and at the same time, the caliper body 5 and the limiting seat 1 are connected through the matching and connection between the positioning protrusion 52 and the positioning mounting hole 11, and the connection mode is simpler and more reliable.

[0109] It should be further explained that the piston 100 of the present application can be specifically adjusted and arranged according to the needs of the brake force of the vehicle type and the project, so as to provide appropriate return force and structure size matched with the caliper body 5. Secondly, in order to match different types of brake pads 6, the piston 100 can be adjusted in size, pitch, etc. of the return elastic member 4, and the number and spacing of the limiting structure N on the limiting seat 1 can be specifically changed; thirdly, in order to adapt to different types of brake calipers 200, according to the requirement of the brake force of the brake caliper 200, the piston 100 can be adjusted in size of the cylinder diameter of the piston body 2, and the return elastic member 4 can be specifically changed to achieve the purpose. However, the structure and structure distribution of the piston 100 will not change too much.

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

[0111] According to the vehicle 10000 of the present invention, by setting the aforementioned brake 1000, the piston body 2 pushes the brake pad 6 to move. The movable distance of the piston body 2 in the piston cavity 51 is at least the reserved gap X, and the movable distance of the brake pad 6 is also at least the reserved gap X. Thus, there is a gap between the brake pad 6 and the brake disc 300, avoiding the situation where the brake pad 6 and the brake disc 300 are tightly attached and jammed when the piston body 2 returns to its original position. At the same time, when the piston body 2 participates in braking, after the brake pad 6 wears, the limiting post 311 can cooperate with another limiting structure N of a certain stage. The compensation structure 3 is repositioned and fixed. The moving distance of the compensation structure 3 is the gap between the limiting structure N of this stage and the limiting structure N of the previous stage. The compensation structure 3 compensates for the moving distance of the piston body 2, so that the piston body 2 can participate in braking without moving more than the reserved gap X, thereby reducing the braking distance of the piston body 2 and improving safety.

[0112] The following is based on Figures 1-7 Describe a specific implementation.

[0113] like Figure 1 and Figure 2 As shown, when braking is required, the piston 100 applies braking force to the piston body 2 via hydraulic oil, causing the piston body 2 to push the brake pad 6 into contact and friction with the brake disc 300, thereby achieving the purpose of braking the brake disc 300. When braking is released, the piston body 2 returns to its original position. Under the elastic force of the reset elastic element 4, the reset elastic element 4 quickly pulls the piston body 2 back to its original position. The brake pad 6 can disengage from the brake disc 300 under the high-speed rotation of the brake disc 300, thereby releasing the braking.

[0114] like Figure 1 and Figure 2As shown, when the brake pad 6 is worn to a certain extent and the braking demand is generated again, the movement distance of the piston body 2 exceeds the reserved gap X, the reverse buckle groove of the piston body 2 pulls the reverse buckle of the compensation structure 3 to move, the limiting column 311 of the compensation structure 3 moves synchronously and is separated from the previous limiting structure N. In this process, the limiting column 311 compresses the limiting spring, so that the limiting spring retracts, and when reaching the next limiting structure N, the limiting spring resets and pushes the limiting column 311 into the limiting structure N. When the braking demand is completed, the piston body 2 resets under the action of the reset elastic element 4, 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, so that the braking is cancelled. When the piston body 2 abuts against the reverse buckle, the reverse buckle has a movement trend to the bottom of the piston cavity 51, and since the limiting column 311 is clamped in the first groove 3211 under the action of the limiting spring, the reverse buckle cannot move to the bottom of the piston cavity 51, so that the piston body 2 stops resetting, and the distance between the piston body 2 and the brake pad 6 is ensured within a certain range, so that the increase of braking time and braking distance caused by the wear condition of the brake pad 6 is avoided, the braking risk of the vehicle 10000 is reduced, and the safety of the driver and the passenger is ensured.

[0115] As shown in Figure 1 , the positioning convex column 52 in the piston cavity 51 is integrally cast with the caliper body 5, and the limiting seat 1 and the positioning convex column 52 are connected through the sealing ring 7 (such as a rubber ring or a silica gel ring), which is simple and reliable to install.

[0116] As shown in Figure 2 and Figure 3 , the piston body 2 is further provided with a dust cover installation groove 81, which can install a dust cover to reduce dust; and the piston body 2 is provided with a rectangular sealing ring installation groove 82 for installing a rectangular sealing ring. The sealing capacity of the piston body 2 is improved.

[0117] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0118] In this application, unless otherwise clearly indicated and limited, the terms "mounting", "connection", "connecting", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0119] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

[0120] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A piston (100) characterized by, The application relates to a piston body (2) and a limiting seat (1) which are used for compensating brake clearance. The limiting seat (1) is provided with a plurality of limiting structures (N) of different levels. The piston body (2) can reciprocate in a first direction relative to the limiting seat (1) to participate in braking or return. A compensation structure (3) can be limitedly matched with the limiting structures (N) of different levels. The piston body (2) is in driving connection with the compensation structure (3) to drive the compensation structure (3) to match with the limiting structures (N) of different levels, so as to compensate brake clearance. The compensation structure (3) comprises a limiting part (31) and a body part (32), the body part (32) is in driving connection with the piston body (2), and the limiting part (31) can move along the first direction under the driving of the body part (32) to match with the limiting structures (N) of different levels.

2. The piston (100) of claim 1, characterized in that The limiting part (31) can reciprocate in a second direction relative to the body part (32) to match with or be separated from the limiting structures (N).

3. The piston (100) of claim 2, characterized in that The limiting structures (N) of different levels are arranged at intervals along the first direction.

4. The piston (100) of claim 3, characterized in that The limiting seat (1) is partially constructed as a sawtooth structure, and the limiting structures (N) are formed between two adjacent sawteeth (13) of the sawtooth structure.

5. The piston (100) of claim 1, wherein The sawteeth (13) are provided with chamfers (14) to guide the embedding of the compensation structure (3) into the limiting structures (N).

6. The piston (100) according to any one of claims 1-5, characterized in that The second direction is perpendicular to the first direction.

7. The piston (100) according to any one of claims 1-5, characterized in that When the piston body (2) drives the body part (32) to move along the first direction, the limiting part (31) matches with the limiting seat (1) to make the limiting part (31) reciprocate along the second direction.

8. The piston (100) according to any one of claims 1-5, characterized in that The limiting part (31) comprises a limiting column (311) and a limiting elastic element (312), and the limiting column (311) is movably connected with the body part (32) through the limiting elastic element (312).

9. The piston (100) of claim 1, wherein The limiting part (31) is provided in plurality, and the plurality of limiting parts (31) are arranged at intervals in the circumferential direction of the piston body (2).

10. The piston (100) of claim 9, characterized in that The body part (32) comprises a first body part (321) provided with a first groove (3211), and the limiting part (31) is adapted to be at least partially accommodated in the first groove (3211).

11. The piston (100) of claim 10, characterized in that The body part (32) further comprises a second body part (322) connected with the first body part (321), and the piston body (2) is in driving connection with the second body part (322). The piston body (2) is provided with a second groove (21), and the second body part (322) is partially arranged in the second groove (21), and the groove wall of the second groove (21) can drive the second body part (322) to move along the first direction.

12. The piston (100) of claim 11, characterized in that The second body part (322) comprises a first section (3221), at least part of the first section (3221) is arranged in the second groove (21), and in the first direction, the first section (3221) is spaced apart from at least one side wall of the second groove (21) to enable the first section (3221) to move in the first direction within the second groove (21).

13. The piston (100) of claim 12, characterized by The first section (3221) has a chamfer structure (3223) to guide the assembly of the first section (3221) to the second groove (21).

14. The piston (100) of claim 1, wherein The piston body (2) has an open-ended accommodating cavity (221), and the limiting seat (1) is at least partially arranged in the accommodating cavity (221).

15. The piston (100) of claim 1, wherein, The piston (100) further comprises a reset elastic member (4) for applying an elastic force to the piston body (2) to reset the piston body (2).

16. The piston (100) of claim 15, characterized by One end of the reset elastic member (4) is connected to the piston body (2), and the other end is connected to the limiting seat (1).

17. A brake (1000) characterized by, The brake (1000) further comprises a brake disc (300), and the brake caliper (200) further comprises a brake pad (6) mounted on the caliper body (5) and capable of reciprocating in the first direction.

18. The brake (1000) according to claim 17, characterized in that The limiting seat (1) is fixedly connected with the caliper body (5), and the piston body (2) is adapted 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) when the piston body (2) reciprocates in the first direction. One of the caliper body (5) and the limiting seat (1) has a positioning protruding column (52), and the other has a positioning mounting hole (11), and the positioning protruding column (52) is arranged in the positioning mounting hole (11).

19. The brake (1000) according to claim 18, characterized in that The brake (1000) according to any one of claims 17-19.

20. A vehicle (10000), characterized in that ​

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