Piston dust cover, brake assembly, and vehicle

Abstract

The utility model discloses a piston dust cover, brake assembly and vehicle, piston dust cover includes: dust cover body, the radial outside of dust cover body is equipped with the first sealing portion for with brake caliper body cooperation, the radial inner side of dust cover body is equipped with the second sealing portion for with brake piston cooperation, wherein, dust cover body includes at least two bending structure that distribute from inside to outside in proper order, and be connected through transition section between adjacent two bending structure. According to the piston dust cover of the utility model, prevented dust cover body mutual extrusion after high -temperature baking and occurred adhesion, guaranteed the deformation stroke of dust cover body is sufficient, thereby effectively prevented dust cover body deformation stroke from brake piston and got out, and further improved the sealing reliability.

Description

Technical Field

[0001] This utility model relates to the field of vehicle manufacturing technology, and in particular to a piston dust cover, a brake assembly having the piston dust cover, and a vehicle having the brake assembly. Background Technology

[0002] Piston dust covers are mainly used to prevent contaminants such as dust, impurities, and moisture from entering the gap between the brake caliper and the brake piston, affecting the movement of the brake piston. Some piston dust covers can also help the brake piston return to its original position.

[0003] In related technologies, the piston dust cover is prone to detaching from the brake piston during deformation, leading to seal failure and poor reliability. Utility Model Content

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a piston dust cover, which prevents the dust cover bodies from sticking together after being squeezed together and baked at high temperature, ensuring sufficient deformation stroke of the dust cover bodies, thereby effectively preventing the dust cover bodies from coming out of the brake piston during the deformation stroke, and thus improving the sealing reliability.

[0005] A piston dust cover according to an embodiment of the present invention includes: a dust cover body, wherein a first sealing portion for cooperating with a brake caliper body is provided on the radially outer side of the dust cover body, and a second sealing portion for cooperating with a brake piston is provided on the radially inner side of the dust cover body; wherein the dust cover body includes at least two bent structures distributed sequentially from the inside to the outside, and adjacent two bent structures are connected by a transition section.

[0006] According to the embodiments of the present invention, the piston dust cover, by providing a first sealing part and a second sealing part that closely cooperate with the brake caliper and the brake piston, effectively prevents external contaminants from entering the gap between the brake caliper and the brake piston, thereby effectively ensuring the normal operation of the brake piston, improving the movement reliability of the brake piston, and enhancing the driving safety of the vehicle; by providing at least two bending structures distributed sequentially from the inside to the outside, and connecting adjacent bending structures through a transition section, it prevents the dust cover bodies from sticking together after being squeezed together and baked at high temperature, ensuring sufficient deformation stroke of the dust cover body, thereby effectively preventing the dust cover body from coming out of the brake piston during the deformation stroke, and thus improving the sealing reliability.

[0007] According to some embodiments of the present invention, in the piston dust cover, the length of at least two of the bending structures in the axial direction of the dust cover body is set to gradually decrease from the outside to the inside in the radial direction of the dust cover body.

[0008] According to some embodiments of the present invention, in the piston dust cover, at least two of the bending structures are connected to the first sealing portion, and the bending structure and the first sealing portion together define a first cavity, the first cavity being located inside the first sealing portion; at least two of the bending structures are connected to the second sealing portion, and the bending structure and the second sealing portion together define a second cavity, the second cavity being located outside the second sealing portion.

[0009] According to some embodiments of the present invention, the piston dust cover has a first pressing protrusion in the transition section. The first pressing protrusion is used to press against the brake caliper or the brake piston to form a first communicating gap at at least a portion of the transition section. The first communicating gap is used to communicate the first cavity and the second cavity.

[0010] According to some embodiments of the present invention, in a piston dust cover, at least two of the bent structures connected to the second sealing portion, together with the second sealing portion, define a third cavity. The third cavity and the second sealing portion are distributed axially in the dust cover body. One side of one of the bent structures is provided with a second pressing protrusion facing the brake piston. The second pressing protrusion is used to press against the brake piston to form a second communication gap between the bent structure and the brake piston. The second communication gap is used to connect the third cavity to the external atmosphere.

[0011] According to some embodiments of the present invention, the piston dust cover is provided in which the second sealing part is adapted to extend radially inward into the sealing groove of the piston; wherein the second sealing part has a first sealing surface, a second sealing surface and a third sealing surface that respectively seal against the inner wall of the sealing groove, the first sealing surface and the third sealing surface are located at the two axial ends of the second sealing part, and the second sealing surface is connected to the inner circumferential surface of the second sealing part.

[0012] According to some embodiments of the present invention, a piston dust cover is provided between the first sealing surface and the second sealing surface, and the first guide slope forms an angle with both the axial and radial directions of the second sealing part; a second guide slope is provided between the second sealing surface and the third sealing surface, and the second guide slope forms an angle with both the axial and radial directions of the second sealing part.

[0013] According to some embodiments of the present invention, the piston dust cover has an included angle θ1 between the first sealing surface and the third sealing surface, satisfying: 5°≤θ1≤30°; and / or, the second sealing surface has an included angle θ2 between the first guide surface, satisfying: 0°≤θ2≤30°.

[0014] According to some embodiments of the present invention, the piston dust cover has a fourth sealing surface and a fifth sealing surface. The fourth sealing surface is located at one axial end of the first sealing surface, and the fifth sealing surface is located on the outer peripheral surface of the first sealing surface. A third guide slope is provided at the connection between the fourth sealing surface and the fifth sealing surface. The third guide slope forms an angle with both the axial and radial directions of the first sealing surface.

[0015] According to some embodiments of the present invention, the piston dust cover has an included angle θ3 between the fourth sealing surface and the third guide inclined surface, satisfying: 0°≤θ3≤45°.

[0016] According to some embodiments of the present invention, a piston dust cover is provided in the first sealing part, the reinforcing skeleton includes a deformable part, a connecting part and a supporting part, the deformable part and the supporting part are connected by the connecting part; wherein, the supporting part is configured to extend radially along the first sealing part, the connecting part is configured to extend axially along the first sealing part, and the deformable part is configured to extend radially outward relative to the connecting part along the first sealing part.

[0017] According to some embodiments of the present invention, the piston dust cover has an included angle θ4 between the deformable part and the connecting part, satisfying: 0°≤θ4≤60°.

[0018] According to some embodiments of the present invention, the piston dust cover has a reinforcing frame structure that is ring-shaped.

[0019] According to some embodiments of the present invention, the piston dust cover has a reinforcing frame with stress grooves formed in the deformable portion.

[0020] According to some embodiments of the present invention, the piston dust cover has multiple stress grooves that are spaced apart circumferentially between the deformable parts.

[0021] This utility model also proposes a braking assembly.

[0022] A braking assembly according to an embodiment of the present invention includes: a brake caliper and a brake piston, the brake piston being movably mounted on the brake caliper; and a piston dust cover, the piston dust cover being the piston dust cover of any of the above embodiments, the piston dust cover being installed between the brake caliper and the brake piston and sleeved on the outside of the brake piston.

[0023] This utility model also proposes a vehicle.

[0024] The vehicle according to the present invention includes the piston dust cover of any of the above embodiments or the brake assembly of the above embodiments.

[0025] The advantages of the aforementioned braking assembly, vehicle, and piston dust cover compared to the prior art are the same and will not be repeated here.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic diagram of the structure of a piston dust cover according to some embodiments of the present invention. Figure 1 ;

[0029] Figure 2 This is a schematic diagram of the structure of a piston dust cover according to some embodiments of the present invention. Figure 2 ;

[0030] Figure 3 This is a cross-sectional view of a piston dust cover according to some embodiments of the present invention;

[0031] Figure 4 This is a cross-sectional view of a piston dust cover according to some embodiments of the present invention;

[0032] Figure 5 yes Figure 4 Enlarged view at point A;

[0033] Figure 6 yes Figure 4 Enlarged view at point B;

[0034] Figure 7 yes Figure 4 Enlarged view at point C;

[0035] Figure 8 This is a schematic diagram of the structure of the reinforced frame according to an embodiment of the present utility model;

[0036] Figure 9 This is a cross-sectional view of the reinforcing frame according to an embodiment of the present utility model;

[0037] Figure 10 This is a schematic diagram of the assembly process of the piston dust cover and the brake piston according to some embodiments of the present utility model;

[0038] Figure 11 This is a schematic diagram of the assembly process of the piston dust cover and brake caliper body according to some embodiments of the present utility model;

[0039] Figure 12This is a schematic diagram of the piston dust cover after assembly according to some embodiments of the present utility model;

[0040] Figure 13 This is a cross-sectional view of a piston dust cover according to other embodiments of the present invention;

[0041] Figure 14 This is a cross-sectional view of a piston dust cover according to other embodiments of the present invention.

[0042] Figure label:

[0043] Brake assembly 1000,

[0044] Piston dust cover 100, brake caliper body 200, brake piston 300, sealing groove 301.

[0045] The dust cover body 1 includes: a first sealing part 11, a fourth sealing surface 111, a fifth sealing surface 112, a third guide slope 113, a second sealing part 12, a first sealing surface 121, a second sealing surface 122, a third sealing surface 123, a first guide slope 124, a second guide slope 125, a positioning hole 126, a second transition fillet 127, a bending structure 13, an intermediate connecting section 131, a bending section 132, a first transition fillet 133, and a transition section 14.

[0046] First cavity 21, second cavity 22, third cavity 23, first pressing protrusion 31, second pressing protrusion 32

[0047] The frame is reinforced 5, the deformable part 51, the connecting part 52, the supporting part 53, and the stress groove 54. Detailed Implementation

[0048] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0049] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] The following is for reference. Figures 1-14 The piston dust cover 100 according to an embodiment of the present utility model is described. The piston dust cover 100 prevents the dust cover bodies 1 from sticking together after being squeezed together and baked at high temperature, and ensures that the deformation stroke of the dust cover bodies 1 is sufficient, thereby effectively preventing the dust cover bodies 1 from coming out of the brake piston 300 during the deformation stroke, thereby improving the sealing reliability.

[0052] like Figures 1-14 As shown, a piston dust cover 100 according to an embodiment of the present invention includes: a dust cover body 1.

[0053] First, it should be noted that the piston dust cover 100 of this utility model can be used in the brake assembly 1000 to seal the gap between the brake caliper body 200 and the brake piston 300. However, it is not limited to this. The piston dust cover 100 can also be used to seal other structures or devices. This application will use its application in the brake assembly 1000 as an example for illustration.

[0054] It is understood that the brake caliper body 200 can form a hydraulic cylinder, and the brake piston 300 is movably installed in the hydraulic cylinder. A hydraulic device pumps or draws hydraulic oil into the hydraulic cylinder, allowing the brake piston 300 to move axially, extending or retracting from the hydraulic cylinder, thus achieving a braking effect. Specifically, during vehicle braking, when the driver depresses the brake pedal, the hydraulic device pumps hydraulic oil into the hydraulic cylinder, causing the brake piston 300 to extend axially from the hydraulic cylinder, moving away from the brake caliper body 200. This pushes the brake pads against the brake disc, achieving the braking effect. During vehicle brake release, when the driver releases the brake pedal, the hydraulic device draws some hydraulic oil from the hydraulic cylinder, reducing the pressure and causing the brake piston 300 to return axially to the hydraulic cylinder, moving closer to the brake caliper body 200. This disengages the brake piston from the brake pads, which in turn disengage from the brake disc, releasing the vehicle from the brakes.

[0055] like Figure 11 As shown, there is a gap between the brake caliper body 200 and the brake piston 300. During the movement of the brake piston 300, external dust, impurities, moisture, and other contaminants may enter this gap, causing the brake piston 300 to become stuck and unable to work properly or its movement to be obstructed. The dust cover body 1 can be installed between the brake caliper body 200 and the brake piston 300 to achieve a sealing effect and prevent external contaminants from entering the gap between the brake caliper body 200 and the brake piston 300 during the movement of the brake piston 300.

[0056] like Figure 1 and Figure 2 As shown, the dust cover body 1 can be constructed as a ring to form a comprehensive and tight seal. The radial outer side of the dust cover body 1 is provided with a first sealing part 11 for cooperating with the brake caliper body 200. That is, the first sealing part 11 is used to tightly fit and connect with the brake caliper body 200 to form an effective sealing structure, preventing external contaminants from entering the gap between the brake caliper body 200 and the piston dust cover 100 through the gap between the brake caliper body 200 and the brake piston 300. In practice, the first sealing part 11 can be interference-fitted with the brake caliper body 200, so that the first sealing part 11 and the brake caliper body 200 are tightly fitted and connected, thereby improving the sealing reliability.

[0057] The inner radial side of the dust cover body 1 is provided with a second sealing part 12 for cooperating with the brake piston 300. That is, the second sealing part 12 is used to tightly fit and connect with the brake piston 300 to form an effective sealing structure, preventing external contaminants from entering the gap between the brake caliper body 200 and the brake piston 300 through the gap between the brake piston 300 and the piston dust cover 100. This ensures that the brake piston 300 is not disturbed by external contaminants during movement. In practice, the second sealing part 12 can be interference-fitted with the brake piston 300, so that the second sealing part 12 and the brake piston 300 are tightly fitted and connected, thereby improving the sealing reliability.

[0058] Therefore, by setting the first sealing part 11 and the second sealing part 12 to closely cooperate with the brake caliper body 200 and the brake piston 300 respectively, an effective sealing interface is formed, which effectively prevents external contaminants from entering the gap between the brake caliper body 200 and the brake piston 300, thereby effectively ensuring the normal operation of the brake piston 300, preventing the movement of the brake piston 300 from being hindered or affected, thereby improving the movement reliability of the brake piston 300 and enhancing the driving safety of the vehicle.

[0059] In actual design, the dust cover body 1 can be made of elastic material, such as EPDM rubber, fluororubber, silicone rubber, nitrile rubber and other rubber or elastic materials, so that the dust cover body 1 can undergo elastic deformation during the extension of the brake piston 300, and when the dust cover body 1 recovers from deformation, it can generate a restoring force acting on the brake piston 300, so that the brake piston 300 can be quickly reset.

[0060] Furthermore, the dust cover body 1 includes at least two bent structures 13 distributed sequentially from the inside to the outside, and the two adjacent bent structures 13 are connected by a transition section 14.

[0061] In other words, from the radially inner side to the radially outer side of the dust cover body 1, two, three, or more bent structures 13 can be sequentially distributed, as shown in the reference. Figure 3 As shown, the bending structure 13 bends upward. The bending structure 13 can increase the strength, rigidity and flexibility of the dust cover body 1, so that it can be deformed to better adapt to the working environment and reciprocating motion of the brake piston 300, and help the dust cover body 1 maintain the correct position and shape during installation, thereby ensuring the sealing effect.

[0062] It should be noted that during vehicle braking, the ambient temperature around the piston dust cover 100 is generally between -40℃ and 140℃. Prolonged high-temperature baking may cause the dust cover body 1 to age and stick. This sticking reduces the travel of the dust cover body 1, and during the extension of the brake piston 300, the second sealing part 12 may detach from the brake piston 300, leading to seal failure. However, due to the upward bending of the bending structure 13, a gap is formed at the bending structure 13. This prevents the dust cover bodies 1 from sticking together after being squeezed together during high-temperature baking, and also ensures sufficient deformation travel of the dust cover body 1. This effectively prevents the dust cover body 1 from detaching from the brake piston 300 during deformation, thereby improving sealing reliability. Furthermore, by setting multiple bending structures 13, the dust cover body 1 can deform more easily, increasing its deformation travel, thus making the deformation and return processes of the dust cover body 1 smoother.

[0063] The dust cover body 1 is formed by a transition section 14 connecting adjacent bending structures 13, making the structure smoother and more continuous. This avoids stress concentration and deformation caused by the bending structures 13, improving the flexibility and durability of the dust cover body 1. In addition, the transition section 14, which connects adjacent bending structures 13, also creates a gap between them, further preventing adhesion between adjacent bending structures 13. This ensures sufficient deformation stroke of the dust cover body 1, effectively preventing it from dislodging from the brake piston 300 during deformation, and further improving sealing reliability.

[0064] According to the embodiment of this utility model, the piston dust cover 100, by providing a first sealing part 11 and a second sealing part 12 to closely cooperate with the brake caliper body 200 and the brake piston 300, effectively prevents external contaminants from entering the gap between the brake caliper body 200 and the brake piston 300, thereby effectively ensuring the normal operation of the brake piston 300, improving the movement reliability of the brake piston 300, and enhancing the driving safety of the vehicle; by providing at least two bending structures 13 distributed sequentially from the inside to the outside, and connecting adjacent two bending structures 13 through a transition section 14, it prevents the dust cover body 1 from sticking together after being squeezed and baked at high temperature, ensuring sufficient deformation stroke of the dust cover body 1, thereby effectively preventing the dust cover body 1 from coming out of the brake piston 300 during the deformation stroke, and thus improving the sealing reliability.

[0065] In some embodiments, the length of at least two bending structures 13 in the axial direction of the dust cover body 1 is set to gradually decrease from the outside to the inside in the radial direction of the dust cover body 1. Thus, during the deformation and unfolding process of the dust cover body 1 as the brake piston 300 extends, the outer bending structure 13 is more likely to deform than the inner bending structure 13 in the direction from the radial outside to the radial inside of the brake piston 300. This results in the bending structures 13 unfolding sequentially in the direction from the radial outside to the radial inside, and the bending structures 13 returning sequentially in the direction from the radial inside to the radial outside during the dust cover body 1 repositioning process. This makes the entire deformation process of the dust cover body 1 smoother and more stable.

[0066] Specifically, such as Figure 3 As shown, taking the example of having two bending structures 13, during the movement of the brake piston 300 away from the brake caliper 200, the brake piston 300 drives the dust cover body 1 to move, causing the dust cover body 1 to deform and unfold. In the radial direction of the dust cover body 1, the axial length of the outer bending structure 13 is longer than that of the inner bending structure 13. Therefore, the outer bending structure 13 is more likely to deform than the inner bending structure 13. Thus, during the deformation and unfolding process of the dust cover body 1, the outer bending structure 13 unfolds first, and the inner bending structure 13 unfolds later. During the return process of the dust cover body 1, the inner bending structure 13 returns to its original position first, and the outer bending structure 13 returns to its original position later. This achieves the sequential unfolding and return of the two bending structures 13, making the entire deformation process of the dust cover body 1 smoother and more stable.

[0067] In some embodiments, at least two bending structures 13 are connected to the first sealing portion 11. One bending structure 13 and the first sealing portion 11 together define a first cavity 21, which is located inside the first sealing portion 11; at least two bending structures 13 are connected to the second sealing portion 12. One bending structure 13 and the second sealing portion 12 together define a second cavity 22, which is located inside the second sealing portion 12.

[0068] Specifically, such as Figure 3 and Figure 4 As shown, two bending structures 13 are provided. The radially outer bending structure 13 is connected to the first sealing part 11 and together with the first sealing part 11 defines a first cavity 21 located inside the first sealing part 11, as shown. Figure 4As shown in the vertical direction, the first cavity 21 is open downwards, and the radially inner bending structure 13 is connected to the second sealing part 12, and together with the second sealing part 12, defines the second cavity 22 located inside the second sealing part 12. The second cavity 22 is open downwards. Thus, the first cavity 21 and the second cavity 22 can provide sufficient space for the deformation of the dust cover body 1, and can effectively prevent the bending structures 13 from sticking together.

[0069] like Figure 4 As shown, the transition section 14 and the two adjacent bending structures 13 also define an upwardly open cavity. This cavity is located between the first cavity 21 and the second cavity 22. This cavity also provides space for the deformation of the dust cover body 1, which can further effectively prevent the bending structures 13 from sticking together.

[0070] like Figure 6 As shown, the bending structure 13 can be composed of an intermediate connecting section 131 and bending sections 132 located on both sides of the intermediate connecting section 131. The intermediate connecting section 131 can be made longer to increase the space size of the first cavity 21 and the second cavity 22, thereby better preventing the bending sections 132 from sticking together and increasing the deformation stroke of the dust cover body 1, further preventing the dust cover body 1 from coming out of the brake piston 300 during deformation. The bending sections 132 and the intermediate connecting part 52 can be connected by a first transition fillet 133, which makes the unfolding and return process of the dust cover body 1 smoother.

[0071] In practical design, for example, the radial length of the intermediate connecting segment 131 can be set to 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, etc., and the radial dimension of the first transition fillet 133 can be set to R1mm, R1.2mm, R1.3mm, R1.4mm, R1.5mm, R1.6mm, etc., and the interval between adjacent bending segments 132 can be set to 0.6mm, 0.8mm, 2.0mm, 2.1mm, 2.2mm, etc. The specific values ​​can be flexibly set according to the actual situation and needs, and are not limited to those described in this embodiment.

[0072] In some embodiments, the transition section 14 is provided with a first pressing protrusion 31, which is used to press against the brake caliper 200 or the brake piston 300 to form a first communication gap at at least a portion of the transition section 14. The first communication gap is used to connect the first cavity 21 and the second cavity 22.

[0073] It should be noted that after the piston dust cover 100 is assembled, the piston dust cover 100 will undergo elastic deformation, and the transition section 14 will press against the brake caliper body 200 or the brake piston 300, making the first cavity 21 and the second cavity 22 independent cavities. Thus, during the braking process of the vehicle, as the brake pads wear, the brake piston 300 gradually extends outward, and the dust cover body 1 deforms and unfolds along with the extension of the brake piston 300, making the internal space of the first cavity 21 and the second cavity 22 larger. This will create a negative pressure under the action of external atmospheric pressure, resulting in a vacuum adsorption phenomenon, adsorbing the dust cover body 1 onto the brake piston 300 or the brake caliper body 200, making it difficult for the dust cover body 1 to deform and not easily extend with the brake piston 300.

[0074] Specifically, the first pressing protrusion 31 can protrude either towards the brake caliper body 200 or towards the brake piston 300. When the first pressing protrusion 31 protrudes towards the brake caliper body 200, it can press against the brake caliper body 200 to contact it. Alternatively, when the first pressing protrusion 31 protrudes towards the brake piston 300, it can press against the brake piston 300 to contact it. This allows a first connecting gap to be formed at least a portion of the transition section 14, i.e., the periphery of the first pressing protrusion 31. The first connecting gap connects the first cavity 21 and the second cavity 22, thereby preventing the first cavity 21 and... The second cavity 22 separates the two cavities into two independent sealed chambers, which can balance the air pressure between the first cavity 21 and the second cavity 22, increase the volume of the first cavity 21 and the second cavity 22, thereby mitigating the influence of vacuum adsorption and enabling the piston dust cover 100 to deform smoothly. At the same time, the first pressing protrusion 31 can make point contact or line contact between the dust cover body 1 and the brake caliper 200 or brake piston 300, isolating the brake caliper 200 or brake piston 300 from the dust cover body 1. This can effectively prevent wear and breakage caused by long-term friction between the dust cover body 1 and the brake caliper 200 or brake piston 300, thereby extending the service life of the brake caliper 200, brake piston 300 or dust cover body 1 and reducing costs.

[0075] like Figure 4 As shown, the transition section 14 is provided with a first pressing protrusion 31 protruding towards the brake caliper body 200. The specific shape of the first pressing protrusion 31 is not limited, and it can be constructed as a spherical protrusion, an elliptical protrusion, a square protrusion, a cylindrical protrusion, an irregular protrusion, etc. Figure 12As shown, when the dust cover body 1 is assembled in the brake caliper body 200 and the brake piston 300, the piston dust cover 100 undergoes a certain degree of elastic deformation. The first pressing protrusion 31 presses against the brake caliper body 200, thereby forming a first connecting gap at other peripheries of the first pressing protrusion 31. The first connecting gap connects the first cavity 21 and the second cavity 22, keeping the two cavities in a connected state and preventing the formation of two independent sealed cavities. This balances the pressure between the first cavity 21 and the second cavity 22. The increased air pressure increases the volume of the first cavity 21 and the second cavity 22, thereby mitigating the effects of vacuum adsorption and enabling the piston dust cover 100 to deform smoothly. At the same time, the first pressing protrusion 31 allows the dust cover body 1 and the brake caliper body 200 to make point contact, separating the transition section 14 between the brake caliper body 200 and the dust cover body 1. This effectively prevents wear and breakage caused by long-term friction between the dust cover body 1 and the brake caliper body 200, thus extending the service life of the brake caliper body 200 and the dust cover body 1 and reducing costs.

[0076] In practical design, such as Figure 2 As shown, the first pressing protrusions 31 can be distributed in groups along the circumferential direction. A group can include multiple spaced-apart first pressing protrusions 31. For example, a group can include two, three, or more first pressing protrusions 31. Figure 2 Taking eight groups, with each group consisting of three, as an example, the first pressing protrusions 31 within each group can be spaced apart by 1mm, 1.5mm, 2mm, 2.5mm, etc. Alternatively, the first pressing protrusions 31 can be set to be evenly spaced along the circumference. This can be flexibly set according to actual conditions and needs. Grouping distribution is more conducive to the connection between the first cavity 21 and the second cavity 22.

[0077] In some embodiments, at least two bending structures 13 are connected to the second sealing portion 12. One bending structure 13 and the second sealing portion 12 together define a third cavity 23, and the third cavity 23 and the second sealing portion 12 are distributed in the axial direction of the dust cover body 1.

[0078] Specifically, such as Figure 3 and Figure 4 As shown, two bending structures 13 are provided. The radially inner bending structure 13 is connected to the second sealing part 12 and together with the second sealing part 12 defines the third cavity 23. The third cavity 23 and the second sealing part 12 are distributed axially in the dust cover body 1, i.e., as shown in the figure. Figure 4 As shown in the vertical direction, the third cavity 23 is located above the second sealing part 12, thereby providing sufficient space for the deformation of the dust cover body 1.

[0079] Furthermore, one side of a bent structure 13 is provided with a second pressing protrusion 32 facing the brake piston 300. The second pressing protrusion 32 is used to press against the brake piston 300 so that a second communication gap is formed between the bent structure 13 and the brake piston 300. The second communication gap is used to communicate the third cavity 23 with the outside atmosphere.

[0080] Specifically, such as Figure 3 As shown, the inner side of the radially inner bending structure 13 is provided with a second pressing protrusion 32 protruding towards the brake piston 300. The specific shape of the second pressing protrusion 32 is not limited, and it can be constructed as a spherical protrusion, an elliptical protrusion, a square protrusion, a cylindrical protrusion, an irregular protrusion, etc., such as... Figure 12 As shown, when the dust cover body 1 is assembled in the brake caliper body 200 and the brake piston 300, the piston dust cover 100 undergoes a certain degree of elastic deformation. The second pressing protrusion 32 presses against the brake piston 300, thereby forming a second connecting gap between the bending structure 13 and the brake piston 300 at other peripheral positions of the second pressing protrusion 32. The third cavity 23 is connected to the external atmosphere through the second connecting gap, preventing the third cavity 23 from forming a sealed cavity, thereby further mitigating the effect of vacuum adsorption. At the same time, the second pressing protrusion 32 allows the dust cover body 1 and the brake piston 300 to make point contact, separating the brake piston 300 from the bending section 132 of the dust cover body 1. This effectively prevents wear and cracking caused by long-term friction between the dust cover body 1 and the brake piston 300, thereby extending the service life of the brake piston 300 and the dust cover body 1 and reducing costs.

[0081] In practical design, such as Figure 1 As shown, the second pressing protrusions 32 can be distributed in groups along the circumferential direction. A group can include multiple spaced-apart second pressing protrusions 32. For example, a group can include two, three, or more first pressing protrusions 31. Figure 1 Taking six groups, with each group consisting of three, the second pressing protrusions 32 within a group can be spaced apart by 1mm, 1.5mm, 2mm, 2.5mm, etc. Alternatively, the second pressing protrusions 32 can be set to be evenly spaced along the circumference. This can be flexibly set according to actual conditions and needs. Grouping distribution is more conducive to the communication between the third cavity 23 and the external atmosphere.

[0082] In some embodiments, such as Figure 11 and Figure 12 As shown, the second sealing part 12 is adapted to extend radially inward into the sealing groove 301 of the brake piston 300. The shape and size of the second sealing part 12 match the sealing groove 301 so that the second sealing part 12 can be tightly fitted and contacted with the sealing groove 301 to achieve a tight seal.

[0083] Furthermore, such as Figure 7 As shown, the second sealing part 12 has a first sealing surface 121, a second sealing surface 122, and a third sealing surface 123 that respectively seal against the inner wall of the sealing groove 301. The first sealing surface 121 and the third sealing surface 123 are located at both axial ends of the second sealing part 12, as shown. Figure 7 As shown in the vertical direction, the first sealing surface 121 is located at the upper axial end of the second sealing part 12, the third sealing surface 123 is located at the lower axial end of the second sealing part 12, and the second sealing surface 122 is connected to the inner circumferential surface of the second sealing part 12.

[0084] Thus, the second sealing part 12 forms a three-sided sealing structure. When the dust cover body 1 is assembled onto the brake piston 300, that is, when the second sealing part 12 extends radially inward into the sealing groove 301 of the brake piston 300, the first sealing surface 121 and the third sealing surface 123 abut against the upper inner wall surface and the lower inner wall surface of the sealing groove 301 to achieve sealing, and the second sealing surface 122 abuts against the inner bottom wall of the sealing groove 301 to achieve sealing, so as to form a tight three-sided sealing structure, thereby increasing the sealing area between the brake piston 300 and the dust cover body 1 and improving the sealing effect between the brake piston 300 and the dust cover body 1.

[0085] In practical design, the distance between the first sealing surface 121 and the third sealing surface 123 can be set larger than the width of the sealing groove 301 to achieve an interference fit, forming a tight seal and preventing gaps. And as... Figure 7 As shown, a second transition fillet 127 is provided at the end where the third sealing surface 123 connects to the bent structure 13. The second transition fillet 127 can reduce the generation of local stress and prevent breakage between the first sealing part 11 and the bent structure 13. Figure 10 As shown, during the assembly of the piston dust cover 100, the second sealing part 12 is turned outward during the assembly process, and the second transition fillet 127 contacts the brake piston 300. Thus, the second transition fillet 127 can also play a transition guiding role, making the assembly smoother. For example, the radial dimension of the second transition fillet 127 can be set to R0.5mm, R0.8mm, R1.0mm, R1.3mm, R1.5mm, R1.8mm, etc., and can be flexibly set according to actual conditions and needs, and is not limited to the example described here.

[0086] In some embodiments, such as Figure 13As shown, a first guide slope 124 is provided between the first sealing surface 121 and the second sealing surface 122. The first guide slope 124 is used to guide the second sealing part 12 smoothly into the sealing groove 301, reduce friction, extend the service life of the dust cover body 1, and at the same time, enable the three sealing surfaces to smoothly fit and connect with the inner wall of the sealing groove 301 to form a good seal. The first guide slope 124 and the second sealing part 12 form an angle in both the axial and radial directions, that is, the first guide slope 124 is inclined. In this way, the first guide slope 124 can provide additional compression or squeezing effect, thereby enhancing the sealing performance of each sealing surface.

[0087] like Figure 7 As shown, a second guide slope 125 is provided between the second sealing surface 122 and the third sealing surface 123. The second guide slope 125 is also used to guide the second sealing part 12 smoothly into the sealing groove 301, reduce friction, extend the service life of the dust cover body 1, and at the same time, enable the three sealing surfaces to smoothly fit and connect with the inner wall of the sealing groove 301 to form a good seal. The second guide slope 125 and the second sealing part 12 form an angle in both the axial and radial directions, that is, the second guide slope 125 is inclined. In this way, the second guide slope 125 can also provide additional compression or squeezing effect, thereby enhancing the sealing performance of each sealing surface.

[0088] Therefore, by setting the first guide slope 124 and the second guide slope 125, the friction and wear during the cooperation between the three sealing surfaces and the sealing groove 301 are reduced, making it easier for the sealing surfaces and the inner wall of the sealing groove 301 to press and fit together, thereby extending the service life of the dust cover body 1 and improving the sealing performance.

[0089] In some embodiments, as shown in 7, an included angle θ1 is formed between the first sealing surface 121 and the third sealing surface 123, satisfying: 5°≤θ1≤30°.

[0090] Specifically, the included angle θ1 between the first sealing surface 121 and the third sealing surface 123 can be set to 5°, 10°, 14°, 18°, 20°, 22.5°, 26°, 28°, 30° or other angles within this range. By adjusting the size of θ1, the contact pressure and contact area between the first sealing surface 121, the third sealing surface 123 and the sealing groove 301 can be changed, thereby affecting the sealing effect.

[0091] Therefore, by setting the included angle θ1 between the first sealing surface 121 and the third sealing surface 123 within a reasonable range of 5° to 30°, after the dust cover is assembled onto the brake piston 300, as the second sealing part 12 tightens within the sealing groove 301, the first sealing surface 121 and the third sealing surface 123 will contact and compress with the upper and lower inner wall surfaces of the sealing groove 301, thereby increasing the contact pressure, improving the tightness of the fit between the brake piston 300 and the dust cover body 1, further improving the sealing effect between the brake piston 300 and the dust cover body 1, and enhancing the sealing performance.

[0092] In other embodiments, such as Figure 7 As shown, the second sealing surface 122 and the first guide surface form an included angle θ2, which satisfies: 0°≤θ2≤30°.

[0093] Specifically, the included angle θ2 between the second sealing surface 122 and the first guide surface can be set to 0°, 10°, 15°, 20°, 25°, 26°, 28°, 30° or other angles within this range. By adjusting the size of θ2, the contact pressure and contact area between the second sealing surface 122 and the sealing groove 301 can be changed, thereby affecting the sealing effect and the guiding effect.

[0094] Therefore, by setting the included angle θ2 between the second sealing surface 122 and the first guide surface within a reasonable range of 0° to 30°, after the piston dust cover 100 is assembled onto the brake piston 300, as the second sealing part 12 tightens within the sealing groove 301, the second sealing surface 122 contacts and is squeezed against the inner bottom wall of the sealing groove 301, thereby increasing the contact pressure, further improving the tightness of the fit between the brake piston 300 and the dust cover body 1, further improving the sealing effect between the brake piston 300 and the dust cover body 1, further enhancing the sealing performance, and achieving the best guiding effect.

[0095] In some embodiments, such as Figure 5 As shown, the first sealing part 11 has a fourth sealing surface 111 and a fifth sealing surface 112. The fourth sealing surface 111 is located at one axial end of the first sealing part 11, as shown in the figure. Figure 5 As shown in the vertical direction, the fourth sealing surface 111 is located at the lower axial end of the first sealing part 11, that is, the bottom of the first sealing part 11, and the fifth sealing surface 112 is located on the outer peripheral surface of the first sealing part 11.

[0096] Thus, the first sealing part 11 forms a double-sided sealing structure. When the dust cover body 1 is assembled onto the brake caliper body 200, the fourth sealing surface 111 presses against the upper surface of the brake caliper body 200 to achieve a seal, and the fifth seal 112 presses against the inner peripheral wall of the brake caliper body 200 to achieve a seal, thereby forming a tight double-sided sealing structure. This increases the sealing area between the brake caliper body 200 and the dust cover body 1, and improves the sealing effect between the brake caliper body 200 and the dust cover body 1.

[0097] Furthermore, such as Figure 5 As shown, a third guide slope 113 is provided at the connection between the fourth sealing surface 111 and the fifth sealing surface 112. The third guide slope 113 forms an angle with both the axial and radial directions of the first sealing part 11. The third guide slope 113 is used to guide the first sealing part 11 to connect smoothly with the brake caliper body 200, reduce friction, and extend the service life of the dust cover body 1.

[0098] like Figure 11 and Figure 12 As shown, during the actual assembly of the piston dust cover 100, after the second sealing part 12 has completed its mating connection with the designated piston, the piston dust cover 100 and the brake piston 300 can be pressed together into the brake caliper body 200. Figure 11 F in the figure represents the force required to press the piston dust cover 100 and the brake piston 300. During pressing, the third guide slope 113 first contacts the brake caliper body 200 to achieve a guiding effect, so as to guide the piston dust cover 100 to be smoothly pressed into the brake caliper body 200 to cooperate and connect with the brake caliper body 200. This can reduce the occurrence of edge breakage on the outer peripheral surface of the first sealing part 11, i.e., the fifth sealing surface 112.

[0099] In some embodiments, such as Figure 5 As shown, an angle θ3 is formed between the fourth sealing surface 111 and the third guide inclined surface 113, satisfying: 0°≤θ3≤45°.

[0100] Specifically, the included angle θ3 between the fourth sealing surface 111 and the third guide inclined surface 113 can be set to 0°, 10°, 15°, 20°, 25°, 26°, 28°, 30°, 35°, 40°, 45° or other angles within this range. By adjusting the size of θ3, the guiding effect can be adjusted.

[0101] Therefore, by setting the included angle θ3 between the fourth sealing surface 111 and the third guide inclined surface 113 within a reasonable range of 0° to 45°, the best guiding effect can be achieved, which allows the first sealing part 11 to be more smoothly pressed and connected to the brake caliper body 200.

[0102] In some embodiments, such as Figure 4 , Figure 13 and Figure 14 As shown, the first sealing part 11 is provided with a reinforcing frame 5, such as Figure 9 As shown, the reinforcing frame 5 includes a deformable part 51, a connecting part 52, and a supporting part 53. The deformable part 51 and the supporting part 53 are connected by the connecting part 52. The deformable part 51 is mainly used to undergo elastic deformation so that the fifth sealing surface 112 can fit more tightly to the brake caliper body 200, achieving a tighter sealing effect. The supporting part 53 is mainly used to achieve stable support installation of the reinforcing frame 5 in the first sealing part 11, and can enhance the torsional strength of the reinforcing frame 5 and enhance the overall structural strength of the dust cover body 1, thereby avoiding twisting and deformation during the press-fitting process of the piston dust cover 100.

[0103] Among them, such as Figure 4 As shown, the support portion 53 is configured to extend radially along the first sealing portion 11, that is, the support portion 53 is arranged parallel to the upper surface of the brake caliper body 200, which is conducive to better supporting the reinforcing frame 5 inside the first sealing portion 11. The connecting portion 52 is configured to extend axially along the first sealing portion 11 and extend upward relative to the support portion 53. The deformable portion 51 is configured to extend radially outward relative to the connecting portion 52 along the first sealing portion 11, so that the deformable portion 51 can approach the fifth sealing surface 112. In this way, during assembly, the deformable portion 51 can exert force on the fifth sealing surface 112 and the brake caliper body 200, which is conducive to the fifth sealing surface 112 and the brake caliper body 200 in close contact.

[0104] In practical design, such as Figure 12 As shown, the maximum outer diameter of the reinforcing frame 5 can be set larger than the inner wall diameter of the brake caliper body 200. In this way, when the piston dust cover 100 is press-fitted, the reinforcing frame 5 will undergo elastic deformation under the action of the inner wall of the brake caliper body 200, and the elastic force to restore its initial state will act on the fifth sealing surface 112, thereby generating radial pressure on the inner wall of the brake caliper body 200. This makes the fifth sealing surface 112 more tightly press against the inner wall of the brake caliper body 200, enhancing the sealing effect.

[0105] Furthermore, by way of example, the distance between the maximum outer diameter of the reinforcing skeleton 5 and the fifth sealing surface 112 can be set to 0 mm, 0.1 mm, 0.2 mm, 0.4 mm, 0.5 mm, etc., so that the distance between the maximum outer diameter of the reinforcing skeleton 5 and the fifth sealing surface 112 can be set to be small, thereby facilitating the elastic deformation of the reinforcing skeleton 5 under compression.

[0106] In some embodiments, such as Figure 9 As shown, an included angle θ4 is formed between the deformable part 51 and the connecting part 52, satisfying: 0°≤θ4≤60°.

[0107] Specifically, the included angle θ4 between the deformable part 51 and the connecting part 52 can be set to 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60° or other angles within this range. By adjusting the size of θ4, the amount of reinforced deformation can be adjusted, thereby adjusting the sealing effect.

[0108] Therefore, by setting the included angle θ4 between the deformable part 51 and the connecting part 52 within a reasonable range of 0° to 60°, the deformation of the reinforcing frame 5 can be effectively increased without causing excessive deformation. This increases the interference fit during assembly and improves the sealing effect after the piston dust cover 100 and the brake caliper 200 are assembled.

[0109] In some embodiments, such as Figure 8 As shown, the reinforcing skeleton 5 is constructed as a ring structure.

[0110] Therefore, the first sealing part 11 can be strengthened in all directions in the circumferential direction, and the fifth sealing surface 112 can be tightly sealed with the brake caliper body 200 at all positions in the circumferential direction, thereby further improving the overall structural strength of the piston dust cover 100 and enhancing the sealing reliability.

[0111] In actual design, the reinforcing skeleton 5 can be integrally formed inside the first sealing part 11, which is convenient to manufacture. The material of the reinforcing skeleton 5 can be selected from metal or non-metal materials with certain elasticity and strength, such as 20 steel, 65Mn or other metal or non-metal materials with elasticity and strength. It can be flexibly set according to actual needs and is not limited to the embodiment described herein.

[0112] And such as Figure 5 As shown, a positioning hole 126 can also be provided at the lower axial end of the first sealing part 11. The positioning hole 126 faces downward and is open to the inward. The positioning hole 126 is used to achieve precise positioning and installation of the reinforcing frame 5. Figure 2 As shown, multiple positioning holes 126 can be provided, and the multiple positioning holes 126 are distributed circumferentially spaced apart. For example, Figure 2 Taking 126 positioning holes as an example.

[0113] In some embodiments, the reinforcing frame 5 is provided with stress grooves 54, which are formed in the deformable portion 51.

[0114] Specifically, such as Figure 8 As shown, a downwardly recessed stress groove 54 is formed on the deformable part 51 of the reinforcing frame 5. When the piston dust cover 100 is pressed in, the reinforcing frame 5 will undergo elastic deformation. The setting of the stress groove 54 provides space for the deformation of the reinforcing frame 5, which is conducive to the deformation of the reinforcing frame 5, thereby improving the elasticity of the reinforcing frame 5 and reducing the stress concentration when the reinforcing frame 5 deforms.

[0115] In some embodiments, there are multiple stress grooves 54 that are spaced apart circumferentially between the deformable portions 51.

[0116] In other words, the number of stress grooves 54 can be set to two, three, four or even more, and multiple stress grooves 54 can be evenly spaced apart in the circumferential direction between the deformable parts 51. Setting multiple stress grooves 54 can allow multiple stress grooves 54 to reserve space for the deformable parts 51 at multiple positions in the circumferential direction, thereby improving the elasticity of the entire reinforcing frame 5 and reducing the stress concentration when the entire reinforcing frame 5 deforms.

[0117] Specifically, such as Figure 8 As shown, multiple arc-shaped stress grooves 54 are evenly distributed in the circumferential direction of the reinforcing skeleton 5, and the stress grooves 54 are distributed between the deformable parts 51. Of course, the stress grooves 54 can also be constructed as square, V-shaped, irregular, etc., and can be flexibly set according to the actual situation, and are not limited to the example described here.

[0118] This utility model also proposes a braking assembly 1000.

[0119] According to an embodiment of the present invention, a brake assembly 1000 includes a brake caliper body 200 and a brake piston 300, wherein the brake piston 300 is movably mounted on the brake caliper body 200.

[0120] Specifically, the brake piston 300 can reciprocate within the brake caliper 200 to achieve the effect of the brake piston 300 being movably mounted on the brake caliper 200, thereby realizing the braking function of the vehicle.

[0121] The brake assembly 1000 also includes a piston dust cover 100, which is a piston dust cover 100 according to any of the above embodiments. The piston dust cover 100 is installed between the brake caliper body 200 and the brake piston 300 and is sleeved on the outside of the brake piston 300.

[0122] Specifically, such as Figure 1 and Figure 2 As shown, the piston dust cover 100 is annular in structure and can be installed between the brake caliper body 200 and the brake piston 300 through the first sealing part 11 and the second sealing part 12, and is sleeved on the outside of the brake piston 300, thereby forming a tight seal in the circumferential direction. This effectively prevents external dust, moisture, impurities and other contaminants from entering the gap between the brake caliper body 200 and the brake piston 300, thereby effectively ensuring the normal operation of the brake piston 300, improving the movement reliability of the brake piston 300 and enhancing the driving safety of the vehicle.

[0123] By setting at least two bending structures 13 distributed sequentially from the inside to the outside, and connecting adjacent bending structures 13 through a transition section 14, the dust cover body 1 is prevented from sticking together after being squeezed and baked at high temperature. This ensures that the deformation stroke of the dust cover body 1 is sufficient, thereby effectively preventing the dust cover body 1 from coming out of the brake piston 300 during the deformation stroke, thus improving the sealing reliability, reducing the failure rate of the brake assembly 1000, and improving the working reliability of the brake assembly 1000.

[0124] This utility model also proposes a vehicle.

[0125] The vehicle according to the present invention includes the piston dust cover 100 of any of the above embodiments or the brake assembly 1000 of the above embodiments.

[0126] According to the embodiments of the present invention, by providing the piston dust cover 100 or the brake assembly 1000, a stable braking effect can be achieved in the vehicle, thereby improving the braking safety and driving safety of the vehicle.

[0127] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0128] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A piston dust cover, characterized in that, include: The dust cover body (1) has a first sealing part (11) on its radially outer side for cooperating with the brake caliper body (200), and a second sealing part (12) on its radially inner side for cooperating with the brake piston (300). The dust cover body (1) includes at least two bent structures (13) arranged sequentially from the inside to the outside, and the two adjacent bent structures (13) are connected by a transition section (14).

2. The piston dust cover according to claim 1, characterized in that, The length of at least two of the bending structures (13) in the axial direction of the dust cover body (1) is set to gradually decrease from the outside to the inside in the radial direction of the dust cover body (1).

3. The piston dust cover according to claim 2, characterized in that, At least two of the bending structures (13) are connected to the first sealing part (11). The bending structure (13) and the first sealing part (11) together define a first cavity (21), which is located inside the first sealing part (11). At least two of the bending structures (13) are connected to the second sealing part (12). The bending structure (13) and the second sealing part (12) together define a second cavity (22), which is located inside the second sealing part (12).

4. The piston dust cover according to claim 3, characterized in that, The transition section (14) is provided with a first pressing protrusion (31), which is used to press against the brake caliper (200) or the brake piston (300) to form a first communication gap at at least a portion of the transition section (14), which is used to connect the first cavity (21) and the second cavity (22).

5. The piston dust cover according to claim 2, characterized in that, At least two of the bending structures (13) are connected to the second sealing part (12). The bending structure (13) and the second sealing part (12) together define a third cavity (23), which is distributed along the axial direction of the dust cover body (1). One side of the bent structure (13) is provided with a second pressing protrusion (32) facing the brake piston (300). The second pressing protrusion (32) is used to press against the brake piston (300) so that a second communication gap is formed between the bent structure (13) and the brake piston (300). The second communication gap is used to communicate the third cavity (23) with the outside atmosphere.

6. The piston dust cover according to claim 1, characterized in that, The second sealing part (12) is adapted to extend radially inward into the sealing groove (301) of the brake piston (300); The second sealing part (12) has a first sealing surface (121), a second sealing surface (122) and a third sealing surface (123) that respectively seal against the inner wall of the sealing groove (301). The first sealing surface (121) and the third sealing surface (123) are located at both ends of the axial direction of the second sealing part (12), and the second sealing surface (122) is connected to the inner circumferential surface of the second sealing part (12).

7. The piston dust cover according to claim 6, characterized in that, A first guide slope (124) is provided between the first sealing surface (121) and the second sealing surface (122), and the first guide slope (124) forms an angle with the second sealing part (12) in both the axial and radial directions; A second guide slope (125) is provided between the second sealing surface (122) and the third sealing surface (123), and the second guide slope (125) forms an angle with the second sealing part (12) in both the axial and radial directions.

8. The piston dust cover according to claim 7, characterized in that, An included angle θ1 is formed between the first sealing surface (121) and the third sealing surface (123), satisfying: 5°≤θ1≤30°; And / or, the second sealing surface (122) and the first guide slope (124) form an included angle θ2, satisfying: 0°≤θ2≤30°.

9. The piston dust cover according to claim 1, characterized in that, The first sealing part (11) has a fourth sealing surface (111) and a fifth sealing surface (112). The fourth sealing surface (111) is located at one axial end of the first sealing part (11), and the fifth sealing surface (112) is located on the outer peripheral surface of the first sealing part (11). A third guide slope (113) is provided at the connection between the fourth sealing surface (111) and the fifth sealing surface (112). The third guide slope (113) forms an angle with both the axial and radial directions of the first sealing part (11).

10. The piston dust cover according to claim 9, characterized in that, An included angle θ3 is formed between the fourth sealing surface (111) and the third guide inclined surface (113), satisfying: 0°≤θ3≤45°.

11. The piston dust cover according to claim 1, characterized in that, The first sealing part (11) is provided with a reinforcing frame (5), the reinforcing frame (5) includes a deformable part (51), a connecting part (52) and a supporting part (53), the deformable part (51) and the supporting part (53) are connected through the connecting part (52); The support portion (53) is configured to extend radially along the first sealing portion (11), the connecting portion (52) is configured to extend axially along the first sealing portion (11), and the deformable portion (51) is configured to extend radially outward relative to the connecting portion (52) along the first sealing portion (11).

12. The piston dust cover according to claim 11, characterized in that, An included angle θ4 is formed between the deformable part (51) and the connecting part (52), satisfying: 0°≤θ4≤60°.

13. The piston dust cover according to claim 12, characterized in that, The reinforcing skeleton (5) is constructed as a ring structure.

14. The piston dust cover according to claim 13, characterized in that, The reinforcing frame (5) is provided with stress grooves (54), which are formed in the deformable part (51).

15. The piston dust cover according to claim 14, characterized in that, The stress grooves (54) are multiple and are spaced apart circumferentially between the deformable parts (51).

16. A braking assembly, characterized in that, include: Brake caliper (200) and brake piston (300), wherein the brake piston (300) is movably mounted on the brake caliper (200); A piston dust cover, wherein the piston dust cover is a piston dust cover according to any one of claims 1-15, the piston dust cover is installed between the brake caliper body (200) and the brake piston (300) and sleeved on the outside of the brake piston (300).

17. A vehicle, characterized in that, Includes the piston dust cover according to any one of claims 1-15 or the brake assembly according to claim 16.

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