Brake piston

Abstract

The utility model discloses a brake piston, and belongs to the field of machinery. A flange in the brake piston is arranged at one end of a piston assembly in a sleeving mode, and the piston assembly axially moves in a reciprocating mode relative to the flange; the buffer structure is arranged between the end of the piston assembly and the flange, and protrusions are arranged on the surface of the buffer structure and used for restraining adhesion between the buffer structure and the piston assembly or the flange. By arranging the protrusions on the surface of the buffer structure, the actual contact area of the buffer structure and the end face of the piston assembly can be reduced, air can flow in the uneven gaps, volatilization and drying of grease on the surface of the buffer structure can be accelerated, viscosity of the grease can be reduced, the adhesion phenomenon can be reduced, the buffer effect is guaranteed, and meanwhile the service life of the piston assembly is prolonged. And the piston can move smoothly.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical field especially relates to a brake piston. BACKGROUND

[0002] At present, the main cylinder cavity piston of the automobile brake structure will collide with the limiting mechanism rigidly and produce huge noise when returning. For example, the noise produced by the piston returning rapidly and colliding with the limiting mechanism violently during the driver releasing the pedal piston returning. Therefore, a buffer pad needs to be arranged in the piston returning area to achieve the effect of reducing noise.

[0003] However, when the driver slightly steps on the pedal piston and the limiting mechanism initially separates, the grease between the contact surfaces will cause the buffer pad and the piston end face to stick together because the buffer pad and the piston are in plane contact (two planes are pasted together), and the two cannot separate smoothly, accompanied by abnormal noise. At the same time, during the piston moving, the phenomena such as jamming and uneven resistance are prone to occur, thereby affecting the stability and accuracy of the piston moving. Under normal circumstances, the buffer pad should be able to compress and rebound flexibly when it is pushed by the piston to play a buffering role. However, the adhesion will cause the buffer pad to lose elasticity and fail to fully play its buffering function, resulting in a significant decrease in the buffering effect. Due to the obstruction of the piston moving and the weakening of the buffering effect, the working state of the entire piston pushing mechanism becomes unstable, and abnormal wear or damage occurs when the load is too large, thereby affecting the service life of the brake product. SUMMARY

[0004] In view of the problems of the piston moving being obstructed and the buffering effect being weakened, the present application provides a brake piston which can effectively inhibit the adhesion between the buffer pad and the piston end face to provide protection for the smooth movement of the piston.

[0005] The present application provides a brake piston, comprising:

[0006] a piston assembly;

[0007] a flange sleeved at one end of the piston assembly, the piston assembly moving reciprocatingly and axially relative to the flange;

[0008] further comprising:

[0009] a buffer structure arranged between the end of the piston assembly and the flange, the surface of the buffer structure being provided with protrusions for inhibiting the adhesion between the buffer structure and the piston assembly or the flange.

[0010] Optionally, the buffer structure is clamped to the inner wall of the flange.

[0011] Optionally, the protrusions are uniformly arranged on the side of the buffer structure in contact with the piston assembly.

[0012] Optionally, the buffer structure is integrally injection molded with the flange.

[0013] Optionally, the buffer structure is integrally injection molded with the end of the piston assembly.

[0014] The protrusions are uniformly arranged on the side of the buffer structure away from the piston assembly.

[0015] Optionally, the brake pedal further comprises:

[0016] The push rod is connected to one end of the brake pedal, and the other end of the push rod is connected to one side of the end of the piston assembly, so as to push the piston assembly to reciprocatingly move axially relative to the flange.

[0017] Optionally, the piston assembly comprises:

[0018] The piston body;

[0019] The limiting ring is connected to one end of the piston body, and is used to limit the piston body to the end of the flange, and the buffer structure is located between the limiting ring and the flange.

[0020] Optionally, the piston assembly further comprises:

[0021] The first inner cavity is arranged on the side of the piston body facing the push rod;

[0022] The limiting block is arranged inside the first inner cavity, and is used to axially limit the other end of the push rod in the first inner cavity, so as to drive the push rod to reciprocatingly move axially relative to the flange.

[0023] Optionally, the brake pedal further comprises:

[0024] The dust cover is sleeved outside the push rod and located between one end of the push rod and the flange.

[0025] Optionally, the brake pedal further comprises:

[0026] The valve block is connected to one end of the flange, and a second inner cavity is arranged on the side of the valve block facing the flange, and the piston assembly is located inside the second inner cavity, so as to reciprocatingly move axially in the second inner cavity.

[0027] The beneficial effects of the above technical solutions are:

[0028] In the technical solution, the flange sleeve in the brake piston is arranged at one end of the piston assembly, the piston assembly moves reciprocatingly relative to the flange in the axial direction, the buffer structure is arranged between the end of the piston assembly and the flange, and the surface of the buffer structure is provided with protrusions for inhibiting adhesion between the buffer structure and the piston assembly or the flange. By arranging the protrusions on the surface of the buffer structure, the actual contact area between the buffer structure and the end surface of the piston assembly can be reduced, air can flow in the uneven gaps, the evaporation and drying of grease on the surface of the buffer structure can be accelerated, the adhesion of the grease can be reduced, the adhesion phenomenon can be reduced, and the purpose of ensuring the buffering effect and smoothly moving the piston is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0029] One or more embodiments are illustrated by way of example in the figures that are part of this disclosure and which are illustrative, but not restrictive, of the present embodiments, wherein elements having the same reference numbers designate corresponding elements and wherein the drawings do not limit the present embodiments to the precise arrangement and configuration shown, but the drawings are provided to more conceptually illustrate the disclosed embodiments.

[0030] Figure 1 Structure diagram of one embodiment of the brake piston according to the present application;

[0031] Figure 2 Schematic diagram of one embodiment of the buffer structure according to the present application;

[0032] Figure 3 Schematic diagram of one embodiment of the buffer structure according to the present application; Figure 2 Schematic diagram of one embodiment of the buffer structure according to the present application;

[0033] Legend: piston assembly 1, limiting ring 1-1, piston main body 1-2, limiting block 1-3, first inner cavity 1-4, flange 2, buffer structure 3, protrusion area 3-1, recessed area 3-2, push rod 4, dust cover 5, valve block 6. DETAILED DESCRIPTION

[0034] The advantages of the present application are further described below in combination with the drawings and specific embodiments.

[0035] The exemplary embodiments will be described in detail herein below with reference to the drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0036] The terminology used in the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0037] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It is to be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0038] The brake piston of the embodiment of the application is mainly applied to the automobile brake structure, and can also be applied to other mechanical structures suitable for brake scenes. The flange sleeve in the brake piston of the application is arranged at one end of the piston assembly, and the piston assembly moves reciprocatingly and axially relative to the flange. The buffer structure is arranged between the end of the piston assembly and the flange, and the surface of the buffer structure is provided with protrusions for inhibiting adhesion between the buffer structure and the piston assembly or the flange. By arranging the protrusions on the surface of the buffer structure, the actual contact area between the buffer structure and the end surface of the piston assembly can be reduced, air can flow in the uneven gaps, the evaporation and drying of grease on the surface of the buffer structure can be accelerated, the adhesion is reduced, the adhesion phenomenon is reduced, and the purpose of smooth movement of the piston while ensuring the buffering effect is achieved.

[0039] The utility model discloses a brake piston to solve the defect that the adhesion between the buffer pad and the end surface of the piston causes the piston to be blocked and the buffering effect to be weakened, and provides a brake piston. Figures 1-3 As shown in FIG. 1, the brake piston according to the preferred embodiment of the application comprises a piston assembly 1, a flange 2 and a buffer structure 3. The flange 2 is arranged at one end of the piston assembly 1, and the piston assembly 1 moves reciprocatingly and axially relative to the flange 2. The buffer structure 3 is arranged between the end of the piston assembly 1 and the flange 2, and the surface of the buffer structure 3 is provided with protrusions for inhibiting adhesion between the buffer structure 3 and the piston assembly 1 or the flange 2.

[0040] In the embodiment, the flange 2 in the brake piston is arranged at one end of the piston assembly 1, and the piston assembly 1 moves axially relative to the flange 2; the buffer structure 3 is arranged between the end of the piston assembly 1 and the flange 2, and the surface of the buffer structure 3 is provided with protrusions for inhibiting adhesion between the buffer structure 3 and the piston assembly 1 or the flange 2. By arranging the protrusions on the surface of the buffer structure 3, the actual contact area between the buffer structure 3 and the end surface of the piston assembly 1 can be reduced, air can flow in the uneven gaps, the evaporation and drying of grease on the surface of the buffer structure 3 can be accelerated, the adhesion can be reduced, and the purpose of smooth movement of the piston while ensuring the buffering effect can be achieved.

[0041] In the embodiment, the flange 2 can be a mounting flange. The mounting flange can realize reliable connection and sealing between devices, and is convenient for mounting and dismounting.

[0042] The surface of the buffer structure 3 in the embodiment is non-planar, and the uneven surface can reduce the actual contact area between the buffer structure 3 and the end surface of the piston assembly 1, air can flow in the uneven gaps, and the evaporation and drying of grease on the surface of the buffer structure 3 can be accelerated. On the one hand, the flowing air can continuously take away the molecules evaporated from the surface of the grease, so that the grease can be dried faster, the adhesion can be reduced, and the adhesion phenomenon can be reduced; on the other hand, the friction between the dried surface of the buffer structure 3 and the end surface of the piston assembly 1 can change, and the adhesion is no longer easy as when the surface is soaked in grease.

[0043] Further, the protrusions can be hemispherical protrusions, cylindrical protrusions, conical protrusions, square columnar protrusions, tooth-shaped protrusions, or radial rib protrusions, and the cross section of the protrusions can also be trapezoidal.

[0044] In the preferred embodiment, referring to FIG. 1, Figures 2-3 As shown in the figure, the buffer structure 3 can be a buffer pad ring, the two side surfaces of the buffer structure 3 are provided with protrusions, forming protrusion regions 3-1 and recessed regions 3-2, wherein the protrusion regions 3-1 and the recessed regions 3-2 are uniformly and alternately arranged in the circumferential direction, the number of the protrusion regions 3-1 and the recessed regions 3-2 is equal, the shapes are the same, and the protrusion regions 3-1 and the recessed regions 3-2 are alternately arranged at equal angles in the circumferential direction.

[0045] In the embodiment, the protrusions on the surface of the buffer structure 3 are uniformly distributed, when the piston assembly 1 is in contact with the buffer structure 3, the pressure borne by the piston assembly 1 is uniformly transmitted to each part of the buffer structure 3, and local excessive stress can be avoided. The wear, deformation and even damage of the buffer structure 3 due to local excessive stress can be effectively reduced, and the service life of the buffer structure 3 can be prolonged. At the same time, when the piston assembly 1 is pressed, the deformation degree of each part is relatively consistent, so that the shock energy can be more uniformly absorbed and dispersed, and a stable and consistent damping effect can be provided.

[0046] The second embodiment of the utility model relates to a brake piston. The second embodiment is basically same with the first embodiment, the main difference is that: the buffer structure 3 is connected in the flange 2 inner wall, the buffer structure 3 is provided with protrusion along the axial direction surface.

[0047] The protrusion is evenly arranged on the side of the buffer structure 3 and the piston assembly 1.

[0048] In actual application, the protrusion can also be evenly arranged on both sides of the buffer structure 3. The buffer structure 3 can adopt a buffer pad ring, and the buffer pad ring is provided with a groove on the circumferential outer side, and is clamped in the inner wall of the fixed flange 2 through the groove.

[0049] Further, the buffer structure 3 and the flange 2 are integrally formed by rubber injection molding.

[0050] It should be noted that the hardness of the buffer structure 3 is lower than that of the flange 2, and also lower than that of the piston assembly 1. The buffer structure 3 can be elastically deformed to play a buffering role.

[0051] As an example but not limited, the buffer structure 3 can adopt rubber, polyurethane, silica gel or thermoplastic elastomer and the like.

[0052] In the embodiment, the buffer structure 3 can be integrally formed with the flange 2 by rubber injection molding, and the buffer structure 3 is arranged on one side of the brake piston. The protrusion can be located on the outer surface of the rubber injection molding, or can be arranged on the surface of the buffer structure 3 and protrude from the rubber injection molding plane. The structure of rubber injection molding can improve the connection strength between the buffer structure 3 and the flange 2.

[0053] The third embodiment of the utility model relates to a brake piston. The third embodiment is basically same with the first embodiment, the main difference is that: the buffer structure 3 and the end of the piston assembly 1 are integrally formed by rubber injection molding.

[0054] The protrusion is evenly arranged on the side of the buffer structure 3 and the piston assembly 1.

[0055] It should be noted that the hardness of the buffer structure 3 is lower than that of the flange 2, and also lower than that of the piston assembly 1. The buffer structure 3 can be elastically deformed to play a buffering role.

[0056] As an example but not limited, the buffer structure 3 can adopt rubber, polyurethane, silica gel or thermoplastic elastomer and the like.

[0057] In the embodiment, the buffer structure 3 can be integrally formed with the end of the piston assembly 1 by overmolding, and the integral setting assembly process is simple. The protrusions provided on the side of the buffer structure 3 away from the brake piston can be located on the outer surface of the overmolding, or can be provided on the surface of the buffer structure 3 and protrude from the plane of the overmolding. The overmolding structure can improve the connection strength between the buffer structure 3 and the piston assembly 1.

[0058] In actual application, when the piston assembly 1 reciprocally moves axially relative to the flange 2, the piston assembly 1 drives the buffer structure 3 to move. When there is no braking force (i.e., the braking force is zero), the piston assembly 1 is clamped in the inner wall of the flange 2 through the buffer structure 3. The protrusions on the surface of the buffer structure 3 are in contact with the inner wall of the flange 2, and the buffering effect is started.

[0059] The fourth embodiment of the utility model relates to a brake piston. The fourth embodiment is substantially the same as the first embodiment, and the main difference is that the brake piston can further include: a push rod 4, one end of the push rod 4 is connected with a brake pedal, the other end of the push rod 4 is connected with one side of the end of the piston assembly 1, and the push rod 4 drives the piston assembly 1 to reciprocally move axially relative to the flange 2.

[0060] In the embodiment, one end of the push rod 4 can be provided with a U-shaped plug or a ball-shaped plug, and the plug is connected with the brake pedal. The axial pressure of the brake pedal is indirectly transmitted through the push rod 4, and the piston assembly 1 is driven to reciprocally move axially.

[0061] In the embodiment, the protrusion gaps (concave-convex) on the surface of the buffer structure 3 are uniformly distributed. When the piston assembly 1 is in contact with the buffer structure 3, the force applied by the push rod 4 is uniformly transmitted to each part of the buffer structure 3, so that the local force is not too large. The wear, deformation and even damage of the buffer structure 3 due to local excessive force are effectively reduced, and the service life of the buffer structure 3 is prolonged. At the same time, when the buffer structure 3 is subjected to the pressure of the push rod 4, the deformation degree of each part is relatively consistent, so that the vibration energy is more uniformly absorbed and dispersed, and a stable and consistent damping effect is provided. The structure of the buffer structure 3 provided with protrusions is beneficial to positioning and calibration during installation. Due to the regular distribution of the protrusions, the concentricity and perpendicularity of the buffer structure 3 and the push rod 4 can be more easily ensured during installation, so that the buffer structure 3 can accurately play its damping function. In actual production, the uniformly distributed protrusions are easier to realize standardization and quality control, which is helpful to improve production efficiency and reduce production cost.

[0062] In a preferred embodiment, the piston assembly 1 can include:

[0063] a piston body 1-2;

[0064] A limiting ring 1-1 is connected to one end of the piston body 1-2 and is used to limit the piston body 1-2 to the end of the flange 2, and the buffer structure 3 is located between the limiting ring 1-1 and the flange 2.

[0065] In the embodiment, the limiting ring 1-1 has a T-shaped structure in cross section with the piston body 1-2, and when there is no braking force (i.e., the braking force is zero), the piston body 1-2 is limited to the inside of the flange 2 by the limiting ring 1-1.

[0066] Further, the piston assembly 1 can further comprise:

[0067] A first inner cavity 1-4 is formed on the side of the piston body 1-2 facing the push rod 4;

[0068] A limiting block 1-3 is arranged in the first inner cavity 1-4 and is used to axially limit the other end of the push rod 4 in the first inner cavity 1-4, so as to drive the push rod 4 to reciprocatingly move axially relative to the flange 2.

[0069] In the embodiment, the other end of the push rod 4 can have a ball head shape, and the ball head end of the push rod 4 is axially limited in the ball socket region of the first inner cavity 1-4 by the limiting block 1-3. The axial pressure of the brake pedal is indirectly transmitted by the push rod 4, and the piston body 1-2 is pushed to reciprocatingly move axially

[0070] The fifth embodiment of the utility model relates to a brake piston. The fifth embodiment is basically the same as the first embodiment, and the main difference is that the piston assembly 1 can further comprise: a dust cover 5, which is sleeved on the outside of the push rod 4 and is located between one end of the push rod 4 and the flange 2 and can be telescopic and reciprocating.

[0071] In the embodiment, the dust cover 5 can block dust, sand particles, fibers and other foreign matters from entering the piston and causing mechanical jamming. The dust cover 5 can also effectively prevent liquid from seeping into the piston. The dust cover 5 can also buffer the impact and vibration when the push rod 4 moves to prevent the device from deforming or shifting.

[0072] The sixth embodiment of the utility model relates to a brake piston. The sixth embodiment is basically the same as the first embodiment, and the main difference is that the brake piston can further comprise: a valve block 6, one end of the valve block 6 is connected to the flange 2, a second inner cavity is formed on the side of the valve block 6 facing the flange 2, the piston assembly 1 is located in the second inner cavity, and is used to reciprocatingly move axially in the second inner cavity.

[0073] In the embodiment, the valve block 6 controls the hydraulic pressure through the reciprocating movement of the piston assembly 1 in the second inner cavity, thereby ensuring that the piston assembly 1 works efficiently within a safe range.

[0074] Referring toFigure 1 As shown, the push rod 4 is connected with the automobile brake pedal through a U-shaped plug at one end, and the other end is axially limited in the ball socket area of the first inner cavity 1-4 through the limiting block 1-3, so as to realize the connection of the push rod 4 and the piston assembly 1. The push rod 4 indirectly transmits the axial pressure of the brake pedal, and pushes the piston body 1-2 to reciprocate axially in the second inner cavity of the valve block 6. The limiting ring 1-1 is rigidly connected with the piston body 1-2, and the cross section is T-shaped structure. The flange 2 is rigidly connected with the valve block 6, and the dust cover 5 is installed between the push rod 4 and the mounting flange 2, which can be telescopic and reciprocate, so as to ensure that dust and impurities cannot enter the interior during normal work; the buffer structure 3 is installed on the flange 2, and works between the flange 2 and the limiting ring 1-1, so as to prevent the flange 2 from directly contacting with the limiting ring 1-1.

[0075] When there is no braking intention, the limiting ring 1-1 contacts with the buffer structure 3, which is the braking zero point or starting point. When there is braking intention, the brake pedal pushes the piston assembly 1 to build pressure braking in the second inner cavity of the valve block 6 through the push rod 4. When the braking intention is removed, the piston assembly 1 will return to the braking zero point. In this process, the limiting ring 1-1 hits the buffer structure 3, so as to reduce the knocking noise. When the buffer structure 3 is separated from the limiting ring 1-1 at the initial braking intention, the adhesion and pulling-off sound is not generated or the noise is reduced. The buffer structure 3 can be separately arranged, and the side groove is clamped with the flange 2, so as to facilitate replacement.

[0076] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A brake piston, comprising: Piston assembly; A flange is fitted onto one end of the piston assembly, and the piston assembly reciprocates axially relative to the flange; Its characteristic is that it further includes: A buffer structure is disposed between the end of the piston assembly and the flange. The surface of the buffer structure is provided with protrusions to suppress adhesion between the buffer structure and the piston assembly or the flange.

2. The brake piston according to claim 1, characterized in that, The buffer structure is snapped onto the inner wall of the flange.

3. The brake piston according to claim 1, characterized in that, The protrusions are evenly distributed on the side of the buffer structure that contacts the piston assembly.

4. The brake piston according to claim 1, characterized in that, The buffer structure is integrally injection molded with the flange.

5. The brake piston according to claim 1, characterized in that, The buffer structure and the end of the piston assembly are integrally injection molded with rubber. The protrusions are evenly distributed on the side of the buffer structure away from the contact of the piston assembly.

6. The brake piston according to claim 1, characterized in that, Also includes: A push rod, one end of which is connected to the brake pedal and the other end of which is connected to one end of the piston assembly, pushes the piston assembly to reciprocate axially relative to the flange.

7. The brake piston according to claim 6, characterized in that, The piston assembly includes: Piston body; A limiting ring is connected to one end of the piston body and is used to limit the piston body to the flange end. The buffer structure is located between the limiting ring and the flange.

8. The brake piston according to claim 7, characterized in that, The piston assembly also includes: The first inner cavity is opened on the side of the piston body facing the push rod; A limiting block is disposed inside the first inner cavity to axially limit the other end of the push rod within the first inner cavity, thereby driving the push rod to reciprocate axially relative to the flange.

9. The brake piston according to claim 6, characterized in that, Also includes: A dust cover is fitted over the outside of the push rod, located between one end of the push rod and the flange.

10. The brake piston according to claim 1, characterized in that, Also includes: A valve block, one end of which is connected to the flange, has a second inner cavity on the side of the valve block facing the flange, and the piston assembly is located inside the second inner cavity for reciprocating axial movement within the second inner cavity.

Images