A brake caliper piston

Abstract

The utility model belongs to piston technical field especially relates to a brake caliper piston, including coaxial first, second piston body, first piston body is equipped with annular stress surface, the second piston body slides in its through hole and is equipped with circular stress surface, still be equipped with sealing structure and elastic part, annular stress surface area is greater than circular stress surface area, and first piston body starting pressure threshold is greater than second piston body, through brake pedal treading front section second piston body first movement produces feedback, avoids the excessive treading of novice, brake pedal treading rear section first piston body starts output strong push force and stops smoothly, treading force and braking force linear matching, reduce the operation difficulty, avoid the emergency brake, elastic part can store force when second piston body moves, drive first piston body small amplitude follow-up, shorten the response interval, realize the braking force smooth transition, can also assist second piston body reset after hydraulic oil withdraws, improve the braking smoothness, security and system durability.

Description

Technical Field

[0001] This utility model belongs to the field of piston technology, and in particular relates to a brake caliper piston. Background Technology

[0002] The vehicle braking system is a core component ensuring driving safety. As a key actuator in the braking system, the performance of the brake caliper piston directly determines the braking response speed, braking smoothness, and braking reliability. The core function of the brake caliper piston is to convert the hydraulic energy of the braking system into mechanical thrust, driving the brake pads to make frictional contact with the brake disc, thereby achieving vehicle deceleration or stopping through friction.

[0003] Existing traditional brake caliper pistons mostly use a single piston structure. When the brake pedal is pressed, hydraulic oil needs to be injected into the piston chamber and sufficient pressure needs to be built up to push the single piston towards the brake pads, thereby achieving braking. Furthermore, the single piston usually has a large outer diameter design, and the amount of hydraulic oil and oil pressure required to push it to move must reach a preset threshold, resulting in a delay in braking response. This delay not only increases the braking distance, but also makes it difficult for novice drivers to accurately control the pedal force. Because they cannot predict the braking response rhythm, they may over-press the brake pedal, leading to sudden braking and other situations, which not only affect driving comfort, but also pose certain safety hazards. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned technical problems by providing a brake caliper piston that achieves timely braking and deceleration in the initial stage and braking to a complete stop in the later stage throughout the entire braking stroke, avoiding braking response delay, making it easier for novice drivers to handle, and reducing the occurrence of sudden braking and other situations.

[0005] In view of this, the present invention provides a brake caliper piston, comprising: The first piston body has a through hole along the axial direction, and an annular force-bearing surface is formed at one end of the axial direction; The second piston body slides axially within the through hole, and forms a circular force-bearing surface at one end located axially. A sealing structure is provided on the second piston body and is used for sealing between the surface of the second piston body and the inner wall of the through hole of the first piston body; An elastic element is disposed between the first piston body and the second piston body and is used to associate the movement of the two. The first piston and the second piston are coaxially arranged, and the area of ​​the annular force-bearing surface is larger than that of the circular force-bearing surface, and the starting pressure threshold of the first piston is greater than that of the second piston.

[0006] In the above technical solution, further: The first piston body has a mounting cavity for mounting an elastic element on the inner wall of the through hole; The sealing structure is located between the second piston body and the inner wall of the mounting cavity, and the end of the second piston body away from the sealing structure slides in fit with the inner wall of the through hole.

[0007] In the above technical solution, further: The sealing structure includes a sliding part and a sealing ring, and the sliding part has a first annular groove for installing the sealing ring.

[0008] In the above technical solution, further: The elastic element includes a spring, and both ends of the spring abut against the sliding part and the inner wall of the mounting cavity, respectively.

[0009] In the above technical solution, further: The first piston body has an annular stop at one end of the mounting cavity, and the annular stop is used to form an annular force-bearing surface of the first piston body.

[0010] In the above technical solution, further: The annular stop block is interference-fitted with the inner wall of the mounting cavity.

[0011] In the above technical solution, further: The first piston body has a second annular groove at the end away from the annular force-bearing surface, which is used to install a dust cover.

[0012] In the above technical solution, further: The end of the first piston body away from the annular force-bearing surface and the end of the second piston body away from the circular force-bearing surface are flush with each other in the unforced state.

[0013] The beneficial effects of this utility model are as follows: 1. By employing a coaxially arranged first and second piston body, and designing the starting pressure threshold of the first piston body to be greater than that of the second piston body, and the annular force-bearing surface area to be greater than that of the circular force-bearing surface area, a stepped braking effect is achieved during the brake pedal depressing process: In the initial stage of depressing, low-pressure hydraulic oil first pushes the second piston body, which has a lower starting pressure threshold, to generate braking deceleration feedback in advance, allowing novice drivers to quickly perceive the braking response and avoid over-depressing the pedal due to a lack of timely feedback; in the later stage of depressing, as the hydraulic pressure increases, the first piston body, with a higher starting pressure threshold, is driven to start, and its larger force-bearing surface outputs more force, achieving a smooth stop of the vehicle; throughout the process, the depressing force and braking force of the brake pedal are linearly matched, and the pedal feel is balanced and smooth, which not only reduces the operating difficulty for novice drivers and effectively avoids sudden braking, but also improves driving comfort and driving safety.

[0014] 2. By designing the elastic element, the second piston moves synchronously with the elastic element during the initial stage of brake pedal depressing, allowing the elastic element to store elastic potential energy. When the second piston reaches the final stage (when the elastic element reaches a greater degree of compression), its stored elastic force will pre-drive the first piston to produce a small-amplitude follow-up movement. This shortens the interval between the first piston's initial response and full braking, avoiding delays in the first piston's participation in braking, and allows for a smooth transition of braking force, reducing the impact caused by sudden changes in braking force. This ensures the timeliness and effectiveness of heavy braking, further reduces the operational difficulty for novice drivers, and comprehensively improves braking safety and driving comfort. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of the present invention; Figure 3 This is a side view of the present invention; Figure 4 This is a utility model Figure 3 Sectional view at point AA; The markings in the figure are as follows: 1. First piston body; 2. Through hole; 3. Annular force-bearing surface; 4. Second piston body; 5. Circular force-bearing surface; 6. Sealing structure; 60. Sliding part; 61. Sealing ring; 62. First annular groove; 7. Elastic element; 8. Mounting cavity; 9. Annular stop; 10. Second annular groove. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0017] Example 1: This embodiment provides a brake caliper piston, including: The first piston body 1 has a through hole 2 along the axial direction, and an annular force-bearing surface 3 is formed at one end of the axial direction; The second piston body 4 slides axially within the through hole 2, and forms a circular force-bearing surface 5 at one end located in the axial direction; The sealing structure 6 is disposed on the second piston body 4 and is used for sealing between the surface of the second piston body 4 and the inner wall of the through hole 2 of the first piston body 1. The elastic element 7 is disposed between the first piston body 1 and the second piston body 4, and is used to associate the movement of the two. The first piston body 1 and the second piston body 4 are coaxially arranged, and the area of ​​the annular force-bearing surface 3 is larger than the area of ​​the circular force-bearing surface 5, and the starting pressure threshold of the first piston body 1 is greater than the starting pressure threshold of the second piston body 4.

[0018] As can be seen in this embodiment, by using a coaxially arranged first piston 1 and second piston 4, and designing the starting pressure threshold of the first piston 1 to be greater than that of the second piston 4, and the area of ​​the annular force-bearing surface 3 to be greater than that of the circular force-bearing surface 5, the brake pedal application process presents a stepped braking effect: in the initial stage of application, low-pressure hydraulic oil first pushes the second piston 4, which has a lower starting pressure threshold, to generate braking deceleration feedback in advance, allowing novice drivers to quickly perceive the braking response and avoid over-applying the pedal due to a lack of timely feedback; in the later stage of application, as the hydraulic pressure increases, the first piston 1, with a higher starting pressure threshold, is driven to start, and its larger force-bearing surface outputs more force, achieving a smooth stop of the vehicle; throughout the process, the pedal force and braking force are linearly matched, and the pedal feel is balanced and smooth, which not only reduces the operating difficulty for novice drivers and effectively avoids sudden braking, but also improves driving comfort and driving safety.

[0019] By configuring the elastic element 7, the second piston 4 will compress the elastic element 7 synchronously when it moves in the initial stage of the brake pedal being pressed, allowing the elastic element 7 to store elastic potential energy. When the second piston 4 moves to the end stage (when the elastic element 7 reaches a large degree of compression), the stored elastic force will pre-drive the first piston 1 to produce a small-amplitude follow-up movement. This shortens the interval between the first piston 1's start-up response and full braking, avoids the delay in the first piston 1's participation in braking, and allows the braking force to form a smooth transition, reducing the impact caused by sudden changes in braking force. This ensures the timeliness and braking effect of heavy braking, further reduces the operating difficulty for novice drivers, and comprehensively improves braking safety and driving comfort. Furthermore, the elastic element 7 can also reset the two piston bodies after the hydraulic oil is withdrawn from the piston chamber. Specifically, the first piston body 1 is reset by the conventional reset structure (a conventional structure of a traditional brake caliper piston, which is known to those skilled in the art from traditional brake caliper pistons and will not be described in detail here). At the same time, the elastic element 7 releases elastic potential energy to cause the second piston body 4 to reset, avoiding the situation where the reset of the second piston body 4 is delayed or stuck, preventing friction and wear between the brake pads and the brake disc, ensuring that the two pistons can return to the preset initial position after each braking, ensuring the next braking, and improving the durability, reliability and driving safety of the braking system.

[0020] Example 2: This embodiment provides a brake caliper piston, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The first piston body 1 has a mounting cavity 8 for mounting the elastic element 7 on the inner wall of the through hole 2; The sealing structure 6 is located between the second piston body 4 and the inner wall of the mounting cavity 8, and the end of the second piston body 4 away from the sealing structure 6 is slidably engaged with the inner wall of the through hole 2.

[0021] As can be seen from this embodiment, the opening of the mounting cavity 8 facilitates the installation and position restriction of the elastic element 7, ensuring the stability of the compression deformation of the elastic element 7. Furthermore, the sealing structure 6 is set between the second piston body 4 and the inner wall of the mounting cavity 8, which can ensure the seal between the first piston body 1 and the second piston body 4, preventing the leakage of hydraulic oil. At the same time, it can ensure that one end of the second piston body 4 slides against the inner wall of the through hole 2, thereby ensuring the stability of the relative sliding between the second piston body 4 and the first piston body 1.

[0022] Example 3: This embodiment provides a brake caliper piston, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The sealing structure 6 includes a sliding part 60 and a sealing ring 61, and the sliding part 60 is provided with a first annular groove 62 for installing the sealing ring 61.

[0023] As can be seen from this embodiment, by setting the sealing structure 6 as a sliding part 60 and a sealing ring 61, it is convenient to slide with the other end of the second piston body 4 and the inner wall of the through hole 2, thereby improving sliding stability. At the same time, the first annular groove 62 facilitates the installation of the sealing ring 61, ensuring the structural stability of the sealing ring 61 and the stability of its sealing performance.

[0024] Example 4: This embodiment provides a brake caliper piston, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The elastic element 7 includes a spring, and the two ends of the spring abut against the sliding part 60 and the inner wall of the mounting cavity 8, respectively.

[0025] As can be seen from this embodiment, by using a spring for the elastic element 7, and having both ends of the spring abut against the sliding part 60 and the inner wall of the mounting cavity 8, the spring is prevented from contacting the hydraulic oil, thus extending its service life. At the same time, the spring is compressed in the direction of sliding along the second piston body 4, ensuring the small-amplitude follow-up of the first piston body 1 and the reset of the second piston body 4.

[0026] Example 5: This embodiment provides a brake caliper piston, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The first piston body 1 is provided with an annular stop 9 at one end of the mounting cavity 8, and the annular stop 9 is used to form the annular force-bearing surface 3 of the first piston body 1.

[0027] As can be seen from this embodiment, by setting the annular stop 9 on the first piston body 1, it is easier to control the size of the annular force-bearing surface 3, ensuring that the area of ​​the annular force-bearing surface 3 is greater than the area of ​​the circular force-bearing surface 5, thereby ensuring that in the later stage of pedaling, as the hydraulic pressure increases, the first piston body 1 with a higher starting pressure threshold is driven to start, and its larger force-bearing surface outputs more force, realizing the smooth braking of the vehicle. Meanwhile, the annular stop 9 can prevent the second piston body 4 from sliding out of the mounting cavity 8, improve the structural stability between the second piston body 4 and the first piston body 1, and facilitate assembly and use.

[0028] Example 6: This embodiment provides a brake caliper piston, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The annular stop 9 is interference-fitted with the inner wall of the mounting cavity 8.

[0029] As can be seen from this embodiment, by using an interference fit between the annular stop 9 and the inner wall of the mounting cavity 8, the connection strength between the annular stop 9 and the first piston body 1 is ensured, and the structure is simple. At the same time, when it is necessary to replace the sealing ring 61 or the spring, it is only necessary to knock the second piston body 4 in the opposite direction, which improves the convenience of disassembly.

[0030] Example 7: This embodiment provides a brake caliper piston, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The first piston body 1 has a second annular groove 10 at the end away from the annular force-bearing surface 3, which is used to install a dust cover.

[0031] As can be seen from this embodiment, the opening of the second annular groove 10 facilitates the installation of the dust cover and improves the structural stability of the dust cover during use.

[0032] Example 8: This embodiment provides a brake caliper piston, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The end of the first piston body 1 away from the annular force-bearing surface 3 and the end of the second piston body 4 away from the circular force-bearing surface 5 are flush with each other in the unforced state.

[0033] As can be seen from this embodiment, by aligning the ends of the first piston body 1 and the second piston body 4 away from the force-bearing surface in an unforced state, a unified initial positioning reference is provided for the two pistons. This avoids abnormally long or short braking strokes caused by initial axial position deviations between the two pistons, making the brake pedal feel more controllable, further adapting to the operating needs of novice drivers, and improving braking smoothness and consistency.

[0034] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A brake caliper piston, characterized in that, include: The first piston body (1) has a through hole (2) along the axial direction, and an annular force-bearing surface (3) is formed at one end of the axial direction. The second piston body (4) slides axially within the through hole (2) and forms a circular force-bearing surface (5) at one end of the axial direction. A sealing structure (6) is provided on the second piston body (4) and is used for sealing between the surface of the second piston body (4) and the inner wall of the through hole (2) of the first piston body (1); An elastic element (7) is disposed between the first piston body (1) and the second piston body (4) and is used to associate the movement of the two. The first piston body (1) and the second piston body (4) are coaxially arranged, and the area of ​​the annular force-bearing surface (3) is larger than the area of ​​the circular force-bearing surface (5), and the starting pressure threshold of the first piston body (1) is larger than the starting pressure threshold of the second piston body (4).

2. The brake caliper piston according to claim 1, characterized in that: The first piston body (1) has an installation cavity (8) for installing the elastic element (7) on the inner wall of the through hole (2). The sealing structure (6) is located between the second piston body (4) and the inner wall of the mounting cavity (8), and the end of the second piston body (4) away from the sealing structure (6) slides in fit with the inner wall of the through hole (2).

3. The brake caliper piston according to claim 2, characterized in that: The sealing structure (6) includes a sliding part (60) and a sealing ring (61), and a first annular groove (62) for installing the sealing ring (61) is provided on the sliding part (60).

4. The brake caliper piston according to claim 3, characterized in that: The elastic element (7) includes a spring, and the two ends of the spring abut against the sliding part (60) and the inner wall of the mounting cavity (8), respectively.

5. The brake caliper piston according to claim 2, characterized in that: The first piston body (1) is provided with an annular stop (9) at one end of the mounting cavity (8), and the annular stop (9) is used to form the annular force-bearing surface (3) of the first piston body (1).

6. The brake caliper piston according to claim 5, characterized in that: The annular stop (9) is interference-fitted with the inner wall of the mounting cavity (8).

7. The brake caliper piston according to claim 1, characterized in that: The first piston body (1) has a second annular groove (10) at one end away from the annular force-bearing surface (3), which is used to install a dust cover.

8. The brake caliper piston according to claim 1, characterized in that: The end of the first piston body (1) away from the annular force-bearing surface (3) and the end of the second piston body (4) away from the circular force-bearing surface (5) are flush with each other in the unforced state.

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