Heat-fading-resistant bicycle hydraulic disc brake piston and hydraulic brake clamp

Abstract

The utility model discloses a heat-fading-resistant bicycle hydraulic disc brake piston and a hydraulic brake clamp. The bicycle hydraulic disc brake piston comprises a shell, a supporting seat and a fixing ring. Wherein the supporting seat is arranged in the shell, a gap is formed between the outer side wall of the supporting seat and the inner side wall of the shell, and the outer side wall of the supporting seat is connected with the inner side wall of the shell through the fixing ring. The hydraulic disc brake piston of the bicycle can effectively isolate heat transfer, most of heat generated during braking cannot be transferred to brake fluid, the heat fading resistance is high, and the braking performance is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle brakes, in particular to a bicycle hydraulic disc brake piston and a hydraulic brake caliper. Background Art

[0002] Brake calipers, also known as brakes or calipers, are used in various vehicles, including bicycles. Due to their superior braking efficiency, hydraulic disc brakes are increasingly used on bicycles. The calipers used in hydraulic disc brakes are called hydraulic brake calipers.

[0003] The specific braking principle of a hydraulic brake caliper is that when the rider presses the handlebars, brake fluid flows into the brake fluid chamber, forcing two pistons to move toward each other, pushing the brake pads to clamp the brake disc, thereby stopping the bicycle wheel and achieving the braking effect. However, existing hydraulic brake calipers still have the following shortcomings:

[0004] During the braking process, the friction between the brake pad and the brake disc will generate a large amount of heat. The heat will be transferred to the piston through the brake pad, and then to the brake fluid through the piston. Due to the influence of heat, when the brake fluid exceeds the boiling point, the brake fluid will vaporize, causing a significant decline in braking performance. Utility Model Content

[0005] The purpose of the present utility model is to overcome the above-mentioned problems and provide a bicycle hydraulic disc brake piston that is resistant to thermal decay. The bicycle hydraulic disc brake piston can effectively isolate heat transfer, and most of the heat generated during braking will not be transferred to the brake fluid. It has strong resistance to thermal decay and effectively improves braking performance.

[0006] Another object of the present invention is to provide a hydraulic brake caliper comprising the above-mentioned thermal-fading-resistant bicycle hydraulic disc brake piston.

[0007] The purpose of the utility model is achieved through the following technical solutions:

[0008] A heat-fading-resistant bicycle hydraulic disc brake piston comprises a shell, a support seat, and a fixing ring; wherein the support seat is arranged inside the shell, a gap is provided between the outer wall of the support seat and the inner wall of the shell, and the outer wall of the support seat and the inner wall of the shell are connected via the fixing ring.

[0009] The working principle of the above-mentioned thermal decay resistant bicycle hydraulic disc brake piston is:

[0010] The brake pad is in contact with the support seat, and the brake fluid is in contact with the outer shell. When braking, the heat of the brake pad will be transferred to the support seat. Since the outer wall of the support seat and the inner wall of the outer shell are connected by a fixing ring, the contact between the fixing ring and the outer shell is line contact, and the contact area is very small, so the possibility of heat transfer is greatly reduced. There is a gap between the outer wall of the support seat and the inner wall of the outer shell, which acts as an insulation against heat transfer through air, effectively preventing the outer shell from heating up, and thus most of the heat cannot be transferred to the brake fluid, effectively improving the braking performance.

[0011] In a preferred embodiment of the present invention, a support pad is provided between the end surface of the support base and the end surface of the interior of the housing. The provision of the support pad prevents direct contact between the end surface of the support base and the end surface of the interior of the housing, thereby blocking the heat transfer path of the end surface. This prevents heating of the housing during braking and improves the stability of the braking system.

[0012] Preferably, the number of the fixing ring is at least one. By providing multiple fixing rings, the stability of the connection between the support base and the housing can be improved.

[0013] Preferably, a ring groove is provided on the outer side wall of the support seat, and the fixing ring is installed in the ring groove. The purpose is to provide the ring groove to facilitate the installation and positioning of the fixing ring and prevent the fixing ring from loosening.

[0014] Preferably, the support base is provided with a through hole. By providing the through hole, the area of ​​the two end surfaces of the support base can be reduced, thereby reducing the contact area between the support base and the brake pad and reducing the contact area between the support base and the support pad, thereby further reducing heat transfer.

[0015] Preferably, the support pad is made of a material with low thermal conductivity. Pistons in existing technology are typically made of metal, ceramic, or resin, each with its own advantages and disadvantages. Metals offer stability and resistance to brittleness, but have the disadvantages of high and rapid thermal conductivity and poor thermal decay resistance. Ceramics and resins offer low thermal conductivity and good thermal decay resistance, but are fragile. The support pad is made of porous vacuum silicon, which has a thermal conductivity of 0.014 W / m·K, reducing heat transfer and resisting brittleness.

[0016] A hydraulic brake caliper comprises a fixed base, two brake pads movably mounted on the fixed base, and two bicycle hydraulic disc brake pistons. The brake pads are arranged in a one-to-one correspondence with the bicycle hydraulic disc brake pistons, and the brake pads abut the support base. The operating principle of the above structure is that when the rider presses the handlebars, the brake fluid is driven to flow, pushing the two bicycle hydraulic disc brake pistons toward each other, respectively pushing the two brake pads to clamp the brake disc, achieving a braking effect through friction.

[0017] Preferably, the material of the shell is the same as that of the fixed base. In the above structure, the material of the shell is the same as that of the fixed base, so that they have the same thermal expansion coefficient and the fitting clearance remains stable under different temperature environments.

[0018] Preferably, hydraulic chambers are provided at both ends of the fixed base, and the two bicycle hydraulic disc brake pistons are respectively disposed in the hydraulic chambers at both ends. The hydraulic chambers are slidably connected to the housing; a sealing ring is provided between the hydraulic chambers and the housing for sealing; the fixed base is provided with a main channel and a branch channel for conveying brake fluid, the main channel being connected to one of the hydraulic chambers, one end of the branch channel being connected to the main channel, and the other end of the branch channel being connected to the other hydraulic chamber. When braking, the rider presses the handlebars, driving the brake fluid to flow in the main channel. Under the diversion of the branch channel, the brake fluid enters the two hydraulic chambers, pushing the two bicycle hydraulic disc brake pistons to slide in the hydraulic chambers, thereby driving the brake pads to move, achieving braking; the sealing ring can improve the sealing performance and prevent the brake fluid in the hydraulic chamber from leaking.

[0019] Preferably, the fixed base is provided with a fixing pin, and the two brake pads are movably connected to the fixing pin. The fixing pin is provided with a reset spring, one end of which acts on one of the brake pads, and the other end of which acts on the other brake pad. With this structure, the fixing pin can be used to mount the brake pad and the reset spring. Both ends of the reset spring are U-shaped, providing uniform elastic force and good rebound effect. After braking, the elastic force of the reset spring can quickly open the two brake pads, releasing the brake and avoiding unnecessary friction loss between the brake pads and the brake disc.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The bicycle hydraulic disc brake piston in the utility model has a line contact between the outer wall of the support seat and the inner wall of the shell via a fixing ring. The contact area between the fixing ring and the shell is very small, which greatly reduces the possibility of heat transfer. In addition, there is a gap between the outer wall of the support seat and the inner wall of the shell, which isolates heat transfer through air, effectively preventing the shell from heating up, thereby preventing most of the heat from being transferred to the brake fluid. The piston has a strong ability to resist thermal decay, effectively improving the braking performance.

[0022] 2. The bicycle hydraulic disc brake piston in the present invention is provided with a shell and a support seat. When the support seat is partially ruptured, the support seat is wrapped by the shell, and the overall performance of the bicycle hydraulic disc brake piston remains unaffected. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1This is a schematic three-dimensional structural diagram of one specific embodiment of a heat-fading-resistant bicycle hydraulic disc brake piston in the present invention.

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of the bicycle hydraulic disc brake piston in the present invention from another viewing angle.

[0025] Figure 3 This is a cross-sectional view of the bicycle hydraulic disc brake piston in the present invention.

[0026] Figure 4 This is an exploded view of the bicycle hydraulic disc brake piston in the present invention.

[0027] Figure 5 It is a cross-sectional view of the support seat in the present invention.

[0028] Figure 6 The utility model is a schematic diagram of the three-dimensional structure of a hydraulic brake caliper.

[0029] Figure 7 This is a front view structural diagram of the hydraulic brake caliper in the present invention.

[0030] Figure 8 for Figure 7 Cross-sectional view along the AA direction.

[0031] Figure 9 for Figure 7 Cross-sectional view along direction BB.

[0032] Figure 10 It is a schematic diagram of the three-dimensional structure of one part of the fixed base in the utility model.

[0033] Figure 11 This is an exploded view of a portion of the structure of the hydraulic brake caliper in the present invention. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with embodiments and drawings, but the implementation methods of the present invention are not limited thereto.

[0035] Example 1

[0036] See also Figures 1-4This embodiment discloses a heat-fading-resistant bicycle hydraulic disc brake piston 1, comprising a shell 1-1, a support seat 1-2, and a fixing ring 1-3; wherein, the support seat 1-2 is arranged inside the shell 1-1, and there is a gap between the outer wall of the support seat 1-2 and the inner wall of the shell 1-1, and the outer wall of the support seat 1-2 and the inner wall of the shell 1-1 are connected through the fixing ring 1-3.

[0037] See also Figures 1-4 The shell 1-1 is made of metal material, and the support seat 1-2 is made of non-metallic material with low thermal conductivity. When working for a long time, it ensures that the heat is isolated from the outside and not transferred to the brake fluid.

[0038] See also Figures 1-4 A support pad 1-4 is provided between the end surface of the support base 1-2 and the end surface inside the housing 1-1. The provision of the support pad 1-4 prevents the end surface of the support base 1-2 from directly contacting the end surface inside the housing 1-1, thereby blocking the heat transfer path of the end surface. This prevents the housing 1-1 from heating up during braking, thereby improving the stability of the braking system.

[0039] See also Figures 1-4 The number of the fixing ring 1-3 is at least one. By providing a plurality of fixing rings 1-3, the stability of the connection between the support base 1-2 and the housing 1-1 can be improved.

[0040] See also Figure 1-Figure 5 The outer wall of the support seat 1-2 is provided with a ring groove 1-21, and the fixing ring 1-3 is installed in the ring groove 1-21. The purpose is to set the ring groove 1-21 to facilitate the installation and positioning of the fixing ring 1-3 and prevent the fixing ring 1-3 from loosening.

[0041] See also Figure 3-Figure 5 In this embodiment, the number of the fixing rings 1-3 is two, and the number of the ring grooves 1-21 is also two. The fixing rings 1-3 and the ring grooves 1-21 are arranged in a one-to-one correspondence.

[0042] See also Figure 3-Figure 5 The support base 1-2 is provided with a through hole 1-22, which extends along the axis of the support base 1-2. By providing the through hole 1-22, the area of ​​the two end surfaces of the support base 1-2 can be reduced, thereby reducing the contact area between the support base 1-2 and the brake pad 3 and the contact area between the support base 1-2 and the support pad 1-4, thereby further reducing heat transfer.

[0043] See also Figure 3-Figure 5The support pads 1-4 are made of a material with low thermal conductivity. Pistons in the prior art are typically made of metals, ceramics, resins, and other materials, each with its own advantages and disadvantages. Metals offer stability and resistance to brittleness, but have the disadvantages of high and rapid thermal conductivity and poor thermal decay resistance. Ceramics and resins offer low thermal conductivity and good thermal decay resistance, but are fragile. Support pads 1-4 are made of porous vacuum silicon, which has a thermal conductivity of 0.014 W / m·K, reducing heat transfer and resisting brittleness.

[0044] See also Figure 1-Figure 5 and Figure 8 The working principle of the above-mentioned thermal decay resistant bicycle hydraulic disc brake piston 1 is:

[0045] The brake pad 3 is in contact with the support seat 1-2, and the brake fluid is in contact with the outer shell 1-1. When braking, the heat of the brake pad 3 will be transferred to the support seat 1-2. Since the outer wall of the support seat 1-2 and the inner wall of the outer shell 1-1 are connected by the fixing ring 1-3, the contact between the fixing ring 1-3 and the outer shell 1-1 is line contact, and the contact area is very small, so the possibility of heat transfer is greatly reduced. In addition, there is a gap between the outer wall of the support seat 1-2 and the inner wall of the outer shell 1-1, which plays a role in isolating heat transfer through air, effectively preventing the outer shell 1-1 from heating up, and thus most of the heat cannot be transferred to the brake fluid, effectively improving the braking performance.

[0046] Example 2

[0047] See also Figure 6-Figure 9 This embodiment discloses a hydraulic brake caliper comprising a fixed base 2, two brake pads 3 movably mounted on the fixed base 2, and two bicycle hydraulic disc brake pistons 1 as described in Example 1. The brake pads 3 are disposed in a one-to-one correspondence with the bicycle hydraulic disc brake pistons 1 and abut against the support bases 1-2. The operating principle of the above structure is as follows: when a rider presses the handlebars, brake fluid flows, pushing the two bicycle hydraulic disc brake pistons 1 toward each other, respectively pushing the two brake pads 3 to clamp the brake disc, achieving a braking effect through friction.

[0048] See also Figure 6-Figure 9 The material of the shell 1-1 is the same as that of the fixed base 2. In the above structure, the material of the shell 1-1 is the same as that of the fixed base 2, so that the two have the same thermal expansion coefficient, and the fitting clearance always remains stable under different temperature environments.

[0049] See also Figures 6-10The fixed base 2 is provided with hydraulic chambers 4 at both ends, and the two bicycle hydraulic disc brake pistons 1 are respectively arranged in the hydraulic chambers 4 at both ends. The hydraulic chambers 4 are slidably connected to the housing 1-1; a sealing ring 5 is provided between the hydraulic chambers 4 and the housing 1-1 for sealing; the fixed base 2 is provided with a main channel 7 and a branch channel 8 for conveying brake fluid. The main channel 7 is connected to one of the hydraulic chambers 4, one end of the branch channel 8 is connected to the main channel 7, and the other end of the branch channel 8 is connected to the other hydraulic chamber 4. When braking, the rider presses the handlebar, driving the brake fluid to flow in the main channel 7. Under the diversion of the branch channel 8, the brake fluid will enter the two hydraulic chambers 4, pushing the two bicycle hydraulic disc brake pistons 1 to slide in the hydraulic chambers 4, and then driving the brake pads 3 to move, achieving braking; the sealing ring 5 can improve the sealing performance and prevent the brake fluid in the hydraulic chamber 4 from leaking.

[0050] See also Figures 8-10 A mounting groove 6 for mounting the sealing ring 5 is provided on the side wall of the hydraulic chamber 4 .

[0051] See also Figure 6-Figure 8 and Figure 11 The fixed base 2 is provided with a fixing pin 9, and the two brake pads 3 are movably connected to the fixing pin 9. The fixing pin 9 is provided with a reset spring 10. One end of the reset spring 10 acts on one of the brake pads 3, and the other end of the reset spring 10 acts on the other brake pad 3. With the above structure, the fixing pin 9 can be used to install the brake pads 3 and the reset spring 10. Both ends of the reset spring 10 are U-shaped, with uniform elastic force and good rebound effect. After braking, the elastic force of the reset spring 10 can quickly open the two brake pads 3, releasing the brake and avoiding unnecessary friction loss between the brake pads 3 and the brake disc.

[0052] See also Figures 6-10 The fixed base 2 consists of two parts, which are connected by bolts.

[0053] The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A heat-fading resistant bicycle hydraulic disc brake piston, characterized in that: It includes a shell, a support seat and a fixing ring; wherein the support seat is arranged inside the shell, there is a gap between the outer wall of the support seat and the inner wall of the shell, and the outer wall of the support seat and the inner wall of the shell are connected through the fixing ring.

2. The heat-fading resistant bicycle hydraulic disc brake piston according to claim 1, characterized in that: A support pad is provided between the end surface of the support seat and the end surface inside the shell.

3. The heat-fading resistant bicycle hydraulic disc brake piston according to claim 1, characterized in that: The number of the fixing ring is at least one.

4. The heat-fading resistant bicycle hydraulic disc brake piston according to claim 3, characterized in that: A ring groove is provided on the outer side wall of the support seat, and the fixing ring is installed in the ring groove.

5. The heat-fading resistant bicycle hydraulic disc brake piston according to claim 1, characterized in that: The support seat is provided with a through hole.

6. The heat-fading resistant bicycle hydraulic disc brake piston according to claim 2, characterized in that: The material of the support pad is porous vacuum silicon.

7. A hydraulic brake caliper, characterized in that: It comprises a fixed base, two brake pads movably arranged on the fixed base and two bicycle hydraulic disc brake pistons as claimed in any one of claims 1 to 6, wherein the brake pads are arranged in one-to-one correspondence with the bicycle hydraulic disc brake pistons, and the brake pads abut against the support seat.

8. A hydraulic brake caliper according to claim 7, characterized in that: The material of the housing is the same as that of the fixing base.

9. The hydraulic brake caliper according to claim 7, characterized in that: Hydraulic chambers are provided at both ends of the fixed base, and the two bicycle hydraulic disc brake pistons are respectively arranged in the hydraulic chambers at both ends, and the hydraulic chambers are slidably connected with the shell; a sealing ring is provided between the hydraulic chamber and the shell for sealing; a main channel and a branch channel for conveying brake fluid are provided on the fixed base, the main channel is connected to one of the hydraulic chambers, one end of the branch channel is connected to the main channel, and the other end of the branch channel is connected to the other hydraulic chamber.

10. The hydraulic brake caliper according to claim 7, characterized in that: The fixed base is provided with a fixing pin, two brake pads are movably connected to the fixing pin, and the fixing pin is provided with a reset spring sheet, one end of the reset spring sheet acts on one of the brake pads, and the other end of the reset spring sheet acts on the other brake pad.

Images