A caliper piston with heat dissipation function

Abstract

This application provides a caliper piston with heat dissipation function, including a connecting cylinder, a heat dissipation structure, and a piston body. The invention features an inner cylinder and an outer cylinder. Through the heat conduction path formed by the inner and outer cylinders, combined with high thermal conductivity copper alloy heat dissipation fins, the heat generated by braking in the piston body can be quickly dissipated. Furthermore, the airflow channel formed by the first and second air ducts accelerates heat dissipation through air convection, preventing heat accumulation in the piston and surrounding components. Simultaneously, the heat-insulating protrusions on the piston body facing the brake pad reduce the contact area with the brake pad, effectively preventing direct heat conduction to the piston body. This invention not only delays the aging of the sealing ring and reduces the risk of brake fluid leakage, improving the reliability of the braking system, but also prevents brake fluid from experiencing vapor lock due to high temperatures through efficient heat dissipation, ensuring stable brake pressure transmission, significantly reducing heat fade problems, and greatly improving vehicle braking safety.

Description

Technical Field

[0001] This application relates to the field of caliper piston technology, and more particularly to a caliper piston with heat dissipation function. Background Technology

[0002] The caliper piston is the core component of a disc brake system. Its main function is to push the brake pads against the brake disc through the pressure of hydraulic oil when the driver presses the brake pedal, thereby generating friction and slowing down or stopping the vehicle. It is usually made of high-strength materials such as aluminum alloy and cast iron, and its surface is precision machined to ensure a tight seal with the cylinder and smooth reciprocating motion. It is a key actuator for transmitting braking pressure.

[0003] The existing technology has the following problems: During the operation of the caliper piston in the existing technology, a large amount of heat generated by the friction between the brake pads and the brake disc will be transferred to the piston through the contact surface. However, the piston itself has a relatively simple heat dissipation structure design and low heat dissipation efficiency, which makes it easy for heat to accumulate in the piston and surrounding components.

[0004] This not only causes the piston to deform due to high temperature, affecting its fit accuracy and movement flexibility with the caliper cylinder, but also accelerates the aging and failure of the seals, causing the risk of brake fluid leakage. At the same time, excessively high temperature will lower the boiling point of the brake fluid, making it easy to produce vapor lock, resulting in delayed braking response or even brake failure. The problem of heat fade is more prominent, especially during continuous braking or high-speed emergency braking, which seriously affects the braking safety and reliability of the vehicle. Utility Model Content

[0005] The purpose of this invention is to provide a caliper piston with heat dissipation function in order to solve the above-mentioned problems.

[0006] The technical solution of this application is implemented as follows:

[0007] This application provides a caliper piston with heat dissipation function, including a connecting cylinder and a heat dissipation structure. The connecting cylinder is fixedly installed at one axial end of the heat dissipation structure. The heat dissipation structure and the connecting cylinder together form a mounting cavity for accommodating the piston body. The piston body is embedded in the mounting cavity. The heat dissipation structure includes an outer cylinder and an inner cylinder. Heat dissipation fins are arranged in a circumferential array on the inner wall of the outer cylinder. One end of each heat dissipation fin is fixedly connected to the inner wall of the outer cylinder, and the other end is fixedly connected to the outer wall of the inner cylinder. The inner cylinder is supported and suspended inside the outer cylinder by the heat dissipation fins. The connecting cylinder is fixedly installed at one axial end of the outer cylinder. The inner cylinder and the connecting cylinder together form a mounting cavity for accommodating the piston body. A first air duct is formed between two adjacent heat dissipation fins. A second air duct is opened on the outer wall of the outer cylinder, avoiding the installation position of the heat dissipation fins. The first air duct and the second air duct are connected radially to form an airflow channel.

[0008] In one embodiment, the system further includes heat-insulating protrusions made of ceramic matrix composite material, which are fixedly installed in a ring array on the end face of the piston body facing the brake pad.

[0009] In one embodiment, the diameter of the heat insulation protrusion is 1-2 mm, the height is 0.1-0.3 mm, and the top surface of the heat insulation protrusion is a plane that is adapted to the brake pad.

[0010] In one embodiment, the heat dissipation fins are made of a high thermal conductivity copper alloy and extend along the axial direction of the outer cylinder, with a spacing of 3-5 mm between two adjacent heat dissipation fins.

[0011] In one embodiment, there are no fewer than five second air ducts, which are evenly arranged along the circumference of the outer cylinder wall.

[0012] In one embodiment, the connecting cylinder and the outer cylinder are fixedly connected by welding.

[0013] The advantages or beneficial effects of the above technical solutions include at least the following:

[0014] This utility model is provided with an inner cylinder and an outer cylinder. Through the heat conduction path formed by the inner cylinder and the outer cylinder, and with the help of high thermal conductivity copper alloy heat dissipation fins, the heat generated by the piston body due to braking can be quickly discharged. Then, with the help of the airflow channel formed by the first air channel and the second air channel, the heat dissipation is accelerated by air convection, thus avoiding the accumulation of heat in the piston and surrounding parts.

[0015] Meanwhile, the ceramic matrix composite heat insulation protrusions on the side of the piston body facing the brake pad can reduce the contact area with the brake pad and effectively block heat from being directly conducted to the piston body.

[0016] This invention not only slows down the aging of the sealing ring and reduces the risk of brake fluid leakage, improving the reliability of the braking system, but also avoids the phenomenon of brake fluid vapor lock due to high temperature through efficient heat dissipation, ensuring stable transmission of braking pressure, significantly reducing the problem of heat fade, and greatly improving the braking safety of the vehicle. Attached Figure Description

[0017] The accompanying drawings illustrate exemplary embodiments of the present application and, together with the description thereof, serve to explain the principles of the present application. These drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of this specification.

[0018] Figure 1 A schematic diagram of the overall structure of this application is presented;

[0019] Figure 2 A schematic diagram of the heat dissipation structure and piston body according to an embodiment of this application is provided;

[0020] Figure 3 A schematic diagram of the heat dissipation structure according to an embodiment of this application is shown;

[0021] Figure 4 Examples of this application are presented. Figure 2 An enlarged schematic diagram of point A in the middle;

[0022] Reference numerals in the attached drawings: connecting cylinder-1, heat dissipation structure-2, piston body-3, outer cylinder-21, inner cylinder-22, heat dissipation fins-23, first air duct-24, second air duct-25, heat insulation protrusion-31. Detailed Implementation

[0023] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0024] It should be noted that, where there is no conflict, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be understood that the term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc., mentioned in this application are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0026] It should be noted that the terms "a" and "several" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0027] The names of the messages or information exchanged between multiple devices in the embodiments of this application are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0028] Reference Figures 1-2A caliper piston with heat dissipation function includes a connecting cylinder 1 and a heat dissipation structure 2. The connecting cylinder 1 is fixedly installed at one axial end of the heat dissipation structure 2. The connecting cylinder 1, in cooperation with the heat dissipation structure 2, serves as a mounting base for installation and connection. At the same time, during braking, the connecting cylinder 1 can also withstand part of the force, maintain the stability of the overall structure, and ensure a reliable working environment for the piston body 3.

[0029] The heat dissipation structure 2 and the connecting cylinder 1 together form an installation cavity for accommodating the piston body 3. The piston body 3 is embedded in the installation cavity. The installation cavity ensures that the piston body 3 can be stably embedded in it and perform normal reciprocating motion. The heat dissipation structure 2 can dissipate the heat generated during braking in a timely manner, so as to prevent the piston body 3 and related components from being affected by overheating.

[0030] Meanwhile, the heat dissipation structure 2, as part of the installation base, together with the connecting cylinder 1, bears the various forces that the piston body 3 experiences during operation, maintains the stability of the overall structure, and ensures that the piston body 3 can perform its braking function normally.

[0031] In one embodiment, reference is made to Figure 3 The heat dissipation structure 2 includes an outer cylinder 21 and an inner cylinder 22;

[0032] A connecting cylinder 1 is fixedly installed at one axial end of the outer cylinder 21. The inner cylinder 22, which is supported and suspended inside the outer cylinder 21, together with the connecting cylinder 1, forms an installation cavity for accommodating the piston body 3. The outer cylinder 21 serves as the outer frame of the heat dissipation structure, used for installation and connection, and ensuring that the components do not shift during braking. The inner cylinder 22 is suspended inside the outer cylinder 21 by heat dissipation fins 23, and together with the connecting cylinder 1, it forms an installation cavity, providing installation space for the piston body 3 and ensuring that the piston body 3 moves smoothly along the axial direction, avoiding braking failure due to installation deviation.

[0033] Meanwhile, the outer cylinder 21 and the inner cylinder 22 serve as key pathways for heat conduction, which can quickly transfer the heat generated by the piston body 3 during braking to its own surface and the surrounding space, thereby reducing the working temperature of the piston body 3 through air convection and preventing the braking performance from deteriorating due to overheating.

[0034] In this embodiment, the inner cylinder 22 and the connecting cylinder 1 are welded together to form an installation cavity. During welding, the inner cylinder 22 is first aligned with the corresponding end of the connecting cylinder 1 and fixed by circumferential welding. After welding, the coaxiality of the two is ensured to be ≤0.05mm, and they together form an installation cavity.

[0035] After the inner cylinder 22 is welded to the connecting cylinder 1, the heat dissipation fins 23 are fixed to the outer wall of the inner cylinder 22 by resistance welding. The heat dissipation fins 23 are evenly distributed along the axial direction of the inner cylinder 22. The outer cylinder 21 is sleeved on the outside of the inner cylinder 22 and the heat dissipation fins 23, so that the top of the heat dissipation fins 23 is embedded in the positioning groove of the inner wall of the outer cylinder 21. The connection between the heat dissipation fins 23 and the inner wall of the outer cylinder 21 is laser welded, so that the inner cylinder 22 is suspended inside the outer cylinder 21 by the heat dissipation fins 23. One axial end of the outer cylinder 21 is attached to the corresponding end of the connecting cylinder 1 and fixed by circumferential welding.

[0036] The connecting cylinder 1 and the outer cylinder 21 are fixed by welding, making them a rigid whole. During the operation of the piston body 3, it can effectively withstand the axial thrust generated during braking and the vibration and impact during vehicle operation, avoiding relative displacement or loosening. The welded connection can effectively seal the gaps at the connection point, preventing brake fluid or other impurities from leaking from the connection point or entering the installation cavity, ensuring the cleanliness of the installation cavity and the normal function of the brake fluid.

[0037] The inner wall of the outer cylinder 21 is provided with heat dissipation fins 23 arranged in a circumferential array. One end of the heat dissipation fin 23 is fixedly connected to the inner wall of the outer cylinder 21, and the other end is fixedly connected to the outer wall of the inner cylinder 22. The inner cylinder 22 is supported and suspended inside the outer cylinder 21 by the heat dissipation fins 23.

[0038] The heat dissipation fins 23 are used for connection, support and heat dissipation. The heat dissipation fins 23 can stably support and suspend the inner cylinder 22 inside the outer cylinder 21, ensuring the relative position and coaxiality between the inner cylinder 22 and the outer cylinder 21, providing a basis for the smooth movement of the piston body 3. In addition, the heat dissipation fins 23 can quickly transfer the heat absorbed by the inner cylinder 22 from the piston body 3 to the outer cylinder 21, and then transfer the heat to the outside through the outer cylinder 21, which significantly improves the heat dissipation efficiency of the entire caliper piston and avoids the braking performance being affected by overheating.

[0039] Among them, the heat dissipation fins 23 are made of high thermal conductivity copper alloy. Copper alloy has excellent thermal conductivity, which can quickly receive the heat transferred from the inner cylinder 22 and quickly conduct the heat to the outer cylinder 21, accelerate the diffusion of heat from the inner cylinder 22 to the external environment, avoid heat accumulation inside, and thus effectively reduce the temperature of the piston body 3 and surrounding components.

[0040] In this embodiment, the heat dissipation fins 23 extend along the axial direction of the outer cylinder 21, and the distance between two adjacent heat dissipation fins 23 is 3mm. The 3mm distance provides sufficient space for airflow, allowing air to flow smoothly between the fins and quickly remove the heat transferred by the fins. At the same time, the 3mm distance ensures that a sufficient number of fins are arranged to guarantee the heat dissipation area and prevents the number of fins from being reduced or the heat dissipation capacity from being weakened due to excessive distance.

[0041] A first air duct 24 is formed between two adjacent heat dissipation fins 23. When the braking system is working, the heat dissipation fins 23 can transfer the heat absorbed by the inner cylinder 22 to the outer cylinder 21. The first air duct 24 provides a dedicated path for airflow. Combined with the 3mm gap between adjacent heat dissipation fins 23, external air can flow smoothly in it, quickly remove the heat transferred by the heat dissipation fins 23, and avoid heat accumulation inside the heat dissipation structure 2. This effectively reduces the temperature of the piston body 3 and surrounding components, and prevents overheating from affecting braking performance.

[0042] A second air duct 25 is provided on the outer wall of the outer cylinder 21, avoiding the installation position of the heat dissipation fins 23. The first air duct 24 and the second air duct 25 are connected radially to form an airflow channel. The first air duct 24 provides an internal path for the airflow between the heat dissipation fins 23. The air carrying heat in the first air duct 24 can be discharged from the second air duct 25 to form a complete convection cycle, which solves the problem of insufficient airflow when relying solely on the first air duct 24.

[0043] The number of second air ducts 25 shall not be less than five, and they shall be evenly arranged along the circumference of the outer cylinder 21. The number of second air ducts 25 shall not be less than five to ensure sufficient internal and external airflow exchange ports, avoid the airflow being limited due to too few air ducts, and when some air ducts are slightly blocked by dust, the remaining air ducts can still maintain effective ventilation, thus ensuring the reliability of heat dissipation.

[0044] In one embodiment, reference is made to Figure 4 It also includes heat insulation protrusions 31, which are made of ceramic matrix composite material and are fixedly installed in a ring array on the side end face of the piston body 3 facing the brake pad.

[0045] The heat-insulating protrusions 31 made of ceramic matrix composite material have excellent heat insulation performance, which can effectively block the large amount of heat generated by the brake pad during braking from being directly conducted to the piston body 3, reducing the temperature rise rate of the piston body 3. By setting them in a ring array, the contact area can be reduced while ensuring the stress stability of the heat-insulating protrusions 31 and the brake pad, further weakening the heat transfer path.

[0046] In this embodiment, the diameter of the heat insulation protrusion 31 is 1.8 mm and the height is 0.25 mm. The top surface of the heat insulation protrusion 31 is a plane that is adapted to the brake pad. The top surface of the heat insulation protrusion 31 is precision ground to make it flat to ensure a tight fit with the brake pad.

[0047] Installation method of heat insulation protrusion 31 and piston body: On the end face of piston body 3 facing the brake pad, plan 4 ring-shaped installation tracks in the circumferential direction, and use laser drilling equipment to process installation holes on each track;

[0048] The bottom of the heat insulation protrusion 31 is roughened by sandblasting, and then a layer of high-temperature resistant ceramic adhesive is evenly applied. The heat insulation protrusion 31 is aligned with the mounting hole and embedded. A special jig is used to apply a pressure of 0.9N to each protrusion and maintain the pressure for 30 seconds to ensure that the bottom of the heat insulation protrusion 31 is fully in contact with the bottom of the mounting hole. After that, the assembled piston body 3 is placed in a constant temperature oven and cured at 80℃ for 3 hours to complete the installation.

[0049] Working principle:

[0050] The connecting cylinder 1 and the heat dissipation structure 2 work together to form an installation base. The inner cylinder 22 and the connecting cylinder 1 together form an installation cavity to accommodate the piston body 3, ensuring that the piston body 3 can reciprocate stably. At the same time, the connecting cylinder 1 and the heat dissipation structure 2 jointly bear the force during braking, maintaining the stability of the overall structure.

[0051] In the heat dissipation structure 2, the inner cylinder 22 and the outer cylinder 21 serve as heat conduction structures to transfer the heat generated by the piston body 3 during braking. The heat dissipation fins 23 made of high thermal conductivity copper alloy accelerate the transfer of heat from the inner cylinder 22 to the outside. The first air duct 24 between adjacent heat dissipation fins 23 and the second air duct 25 of the outer cylinder 21 form an airflow channel, which dissipates heat quickly through air convection.

[0052] The piston body 3 has a ring array of ceramic matrix composite heat insulation protrusions 31 on the end face facing the brake pad. By reducing the contact area with the brake pad, it blocks the direct conduction of heat, thereby effectively reducing the temperature of the piston body 3 and surrounding components, avoiding overheating that could affect braking performance, and ensuring the reliable operation of the braking system.

[0053] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0054] Those skilled in the art should understand that the above embodiments are merely for illustrative purposes and are not intended to limit the scope of this application. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of this application.

Claims

1. A caliper piston having a heat dissipation function, characterized by: It includes a connecting cylinder (1) and a heat dissipation structure (2). The connecting cylinder (1) is fixedly installed at one axial end of the heat dissipation structure (2). The heat dissipation structure (2) and the connecting cylinder (1) together form an installation cavity for accommodating the piston body (3). The piston body (3) is embedded in the installation cavity. The heat dissipation structure (2) includes an outer cylinder (21) and an inner cylinder (22). The inner wall of the outer cylinder (21) is provided with heat dissipation fins (23) arranged in a circumferential array. One end of the heat dissipation fins (23) is fixedly connected to the inner wall of the outer cylinder (21), and the other end is fixedly connected to the outer wall of the inner cylinder (22). The inner cylinder (22) is supported and suspended inside the outer cylinder (21) by the heat dissipation fins (23). A connecting cylinder (1) is fixedly installed at one axial end of the outer cylinder (21). The inner cylinder (22) supported and suspended inside the outer cylinder (21) and the connecting cylinder (1) together form an installation cavity for accommodating the piston body (3). A first air duct (24) is formed between two adjacent heat dissipation fins (23). A second air duct (25) is opened on the outer wall of the outer cylinder (21) away from the installation position of the heat dissipation fins (23). The first air duct (24) and the second air duct (25) are connected radially to form an airflow channel.

2. The caliper piston with heat dissipation function according to claim 1, characterized in that: It also includes heat-insulating protrusions (31), which are made of ceramic matrix composite material and are fixedly installed in a ring array on the side end face of the piston body (3) facing the brake pad.

3. The caliper piston with heat dissipation function according to claim 2, characterized in that: The diameter of the heat insulation protrusion (31) is 1-2 mm and the height is 0.1-0.3 mm, and the top surface of the heat insulation protrusion (31) is a plane that is adapted to the brake pad.

4. The caliper piston with heat dissipation function according to claim 1, characterized in that: The heat dissipation fins (23) are made of high thermal conductivity copper alloy and extend along the axial direction of the outer cylinder (21). The distance between two adjacent heat dissipation fins (23) is 3-5 mm.

5. The caliper piston with heat dissipation function according to claim 1, characterized in that: The number of the second air duct (25) is not less than five, and they are evenly arranged along the circumference of the outer cylinder (21).

6. The caliper piston with heat dissipation function according to claim 1, characterized in that: The connecting cylinder (1) and the outer cylinder (21) are fixedly connected by welding.

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