Guide mechanism for motorcycle disc brake caliper

Abstract

The application discloses a guide mechanism for a motorcycle disc brake caliper. The guide mechanism comprises a connecting plate fixed on a front fork or a rear fork and a caliper body slidably mounted on the connecting plate, a guide pin with a threaded end fixed on the connecting plate through threaded connection and a smooth end sleeved in a guide pin hole on the caliper body, a guide pin dust cover sleeved between the guide pin hole on the caliper body and the guide pin, and a guide pin plastic sleeve arranged at one end of the guide pin dust cover where the smooth end of the guide pin is located and matched through pressing. The guide mechanism can better enable the caliper body to slide in the axial direction of the guide pin, so that the single-sided piston can push the inner and outer brake pads to evenly tighten the brake disc and generate braking force. The guide mechanism can improve the convenience of after-sales maintenance, ensure the corrosion resistance of the guide mechanism, and effectively inhibit the risk of abnormal sound generated by the brake caliper.

Description

Technical Field

[0001] This invention relates to the internal structural design of brakes, and in particular to a guide mechanism for motorcycle disc brake calipers. Background Technology

[0002] The guiding mechanism of a traditional motorcycle floating caliper typically consists of a fixed bracket, a guide pin, a floating caliper body, a dust cover, and a special lubricant. This traditional guiding mechanism allows the brake caliper to slide slightly freely in the direction perpendicular to the brake disc. During braking, the piston pushes the inner brake pad against the brake disc, and the resulting reaction force drives the entire caliper body to slide axially along the guide pin. This causes the outer brake pad to also press against the other side of the brake disc, achieving balanced clamping on both sides and generating braking force.

[0003] The existing technical solution CN208041007U describes a motorcycle brake caliper, including a mounting bracket fixed to the frame. A brake caliper pump body is slidably mounted on the mounting bracket via a guide post. The pump body has caliper jaws that snap onto the brake disc. First and second brake pads are located on either side of the brake disc within the caliper jaws. The first brake pad moves axially under the drive of the pump body, achieving contact or disengagement with the brake disc. The second brake pad is floatingly mounted on the caliper jaws and movably connected to the guide post. An elastic element is provided between the second brake pad and the pump body to keep the second brake pad in contact with one side of the caliper jaws. This guiding mechanism suffers from several drawbacks during use. As the sliding components wear, the sliding resistance increases, leading to a larger drag torque. Furthermore, the exposed guiding structure is susceptible to corrosion from mud, water, and other foreign matter, resulting in reduced corrosion resistance.

[0004] The existing technical solution CN223411322U describes a motorcycle brake caliper, comprising: a first mounting block, and further comprising: a second mounting block connected to one side of the first mounting block, and a fixed plate fixedly connected to the inner side of the second mounting block; mounting posts penetratingly connected to the top of both sides of the fixed plate, and the mounting posts fixedly mounted inside the first mounting block; a brake disc sleeved on the outer wall of the mounting posts, the brake disc being parallel to the fixed plate, and brake pads fixedly connected to the inner sides of both the brake disc and the fixed plate. This guiding mechanism suffers from inconvenience in after-sales maintenance, difficulty in disassembly, and sometimes requiring the removal of the entire wheel for brake caliper maintenance; it also exhibits metal-to-metal friction, which over time can lead to impact noises and other defects between the caliper body, brake pads, and pins. Summary of the Invention

[0005] The purpose of this invention is to address the problems of existing motorcycle brake calipers, such as difficulty in disassembly, high drag torque, rapid wear of sliding components, poor corrosion resistance, and abnormal noise, by designing and providing a guide mechanism specifically for motorcycle disc brake calipers to solve the above problems.

[0006] The technical solution adopted in this invention is: The present invention includes a connecting plate fixed to a front fork or a rear swingarm and a clamp body slidably mounted on the connecting plate, and further includes: The guide pin has a threaded end, which is fixedly connected to the connecting plate by a threaded connection, and a smooth end, which is fitted into the guide pin hole on the clamp body. A guide pin dust cover is fitted between the guide pin hole and the guide pin of the clamp body to seal the gap between the guide pin and the guide pin hole; The guide pin plastic sleeve is arranged at one end of the guide pin dust cover where the smooth end of the guide pin is located and is engaged by pressing it in.

[0007] The clamp body is provided with guide pin holes for the guide pin and the guide pin dust cover to pass through. The guide pin dust cover is fitted into the guide pin holes, and the smooth end of the guide pin passes through the guide pin dust cover with clearance fit.

[0008] One end of the guide pin dust cover serves as a telescopic end, which is fixedly embedded in the guide pin to form a seal; the other end of the guide pin dust cover serves as a head end, which passes through the guide pin hole of the clamp body and is axially limited and fixed to the end face of the guide pin hole by a snap-fit ​​structure.

[0009] The dust cover head end of the guide pin has an annular groove on the inner hole wall as a cover annular slot, and the guide pin plastic sleeve has a flange on the outer periphery of the port as a sleeve flange. The sleeve flange is fixedly nested in the cover annular slot at the head end of the guide pin dust cover to form a seal.

[0010] The guide pin has an annular groove as a pin annular slot, and the telescopic end of the guide pin dust cover is embedded in the pin annular slot.

[0011] The guide pin has an outer flange between the connecting plate and the clamp body, and one side of the outer flange has a stepped surface that is in close contact with the connecting plate to form an installation positioning surface.

[0012] The outer flange has a pin ring groove for connecting the guide pin dust cover next to the stepped surface on the other side.

[0013] The smooth end face of the guide pin has an internal hexagonal hole for disassembly and installation.

[0014] The dust cover of the guide pin and the guide pin hole are interference fit.

[0015] This invention allows the caliper body to slide more smoothly along the axial direction of the guide pin, enabling the piston on one side to push the inner and outer brake pads, evenly tightening the brake disc and generating braking force. This guiding mechanism not only improves the convenience of after-sales maintenance and ensures the corrosion resistance of the guiding mechanism, but also effectively suppresses risks such as abnormal noise from the brake caliper.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The guide pin dust cover is fixed at both ends, forming a sealed cavity. This isolates the guide pin from the outside environment, preventing foreign objects such as mud, sand, and water from entering the guide pin dust cover and causing corrosion or jamming.

[0017] 2. The traditional metal-to-metal sliding friction of the motorcycle guide mechanism is replaced with lubricated friction between metal and rubber, which reduces drag torque and effectively suppresses impact noise between the caliper, brake block, and pin.

[0018] 3. The guide pin plastic sleeve of this invention is designed as a detachable structure. The guide pin plastic sleeve can be removed from the head of the guide pin dust cover, exposing the internal hexagonal hole of the guide pin. An internal hex wrench can be used to loosen and remove the guide pin, allowing the caliper body to be flipped over for brake pad replacement. This invention enables after-sales maintenance of the brake caliper without disassembling the wheel. Attached Figure Description

[0019] Figure 1 This is an axial view of the guide mechanism for motorcycle disc brake calipers according to the present invention.

[0020] Figure 2 for Figure 1 Cross-sectional view of the guide mechanism.

[0021] Figure 3 for Figure 2 A cross-sectional view of the guide mechanism along the BB direction.

[0022] Figure 4 Axial view of the guide pin.

[0023] Figure 5 for Figure 4 The front view of the guide pin.

[0024] Figure 6 Axial view of the guide pin dust cover.

[0025] Figure 7 Axial view of the guide pin plastic sleeve.

[0026] Figure 8 This is an axial view of a motorcycle floating brake caliper assembly with a connecting plate.

[0027] In the diagram, 1. Connecting plate, 2. Clamp body, 3. Guide pin, 4. Guide pin dust cover, 5. Guide pin plastic sleeve, 6. Cover annular groove, 7. Pin annular groove, 8. Mounting positioning surface, 9. Threaded end, 10. Smooth end, 11. Guide pin internal hexagonal hole, 12. Sleeve flange. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 and Figure 2 As shown, the brake caliper is a floating brake caliper, including a connecting plate 1 fixed to the front fork or rear swingarm and a caliper body 2 slidably mounted on the connecting plate 1. The caliper body 2 has a guide pin hole; the connecting plate 1 is fixed to the motorcycle's front fork or rear swingarm. It further includes: like Figure 4 As shown, the guide pin 3 has a threaded end 9 at one end, which is fixedly connected to the connecting plate 1 by the threaded connection. The other end is a smooth end 10, which is fitted into the guide pin hole on the clamp body 2. The guide pin dust cover 4 is fitted between the guide pin hole and the guide pin 3 of the clamp body 2 to seal the gap between the guide pin 3 and the guide pin hole. The guide pin plastic sleeve 5 is arranged at one end of the guide pin dust cover 4, where the smooth end 10 of the guide pin 3 is located, and is engaged by pressing.

[0030] like Figure 3 As shown, the clamp body 2 is provided with guide pin holes for the guide pin 3 and the guide pin dust cover 4 to pass through. The guide pin dust cover 4 is fitted into the guide pin holes, and the smooth end 10 of the guide pin 3 is fitted into the guide pin dust cover 4 with clearance fit.

[0031] The smooth end 10 of the guide pin 3 is fitted into the guide pin dust cover 4 with a clearance fit. When the brake caliper needs to brake, the force pushes the caliper body, causing the guide pin dust cover 4 to move.

[0032] The dustproof sealing structure of the mechanism includes: One end of the guide pin dust cover 4 serves as a telescopic end, which is fixedly embedded in the guide pin 3 to form a seal; the other end of the guide pin dust cover 4 serves as a head end, which passes through the guide pin hole of the clamp body 2 and is axially limited and fixed to the end face of the guide pin hole by a snap-fit ​​structure.

[0033] like Figure 6 As shown, the guide pin dust cover 4 has an annular groove on the inner wall of the end hole as a cover annular slot 6, as shown. Figure 7 As shown, the guide pin plastic sleeve 5 has a flange on the outer periphery of the port as a sleeve flange 12, and the sleeve flange 12 is fixedly nested in the cover annular groove 6 at the head end of the guide pin dust cover 4 to form a seal.

[0034] Specifically, such as Figure 6 and Figure 7 As shown, in practice, an annular groove 6 is provided at the head of the guide pin dust cover 4. This annular groove 6 seals the flange 12 at the bottom of the guide pin plastic sleeve 5 and fixes it to the head end of the guide pin dust cover 4.

[0035] like Figure 4 As shown, the guide pin 3 has an annular groove as a pin annular slot 7, and the telescopic end of the guide pin dust cover 4 is embedded in the pin annular slot 7.

[0036] The guide pin dust cover 4 is made of a rubber material, and multiple flexible corrugated tube sections are evenly distributed along the inner wall at the telescopic end. The number of these sections is between 5 and 9, and the thickness is between 1 and 3 mm.

[0037] The guide pin 3 has an outer flange between the connecting plate 1 and the clamp body 2. The flange surface formed by the outer flange is a structure with opposite sides flush. The stepped surface on one side of the outer flange is in close contact with the connecting plate 1 to form the installation positioning surface 8.

[0038] The outer flange has a pin annular groove 7 on the other side of the stepped surface near the clamp body 2 for connecting the telescopic end of the guide pin dust cover 4.

[0039] like Figure 5 As shown, the smooth end 10 of the guide pin 3 has an internal hexagonal hole 11 for disassembly and installation.

[0040] The smooth end of guide pin 3 has an internal hexagonal hole 11 at its top, and its flange face has a flush-side structure. This allows for easy access during after-sales maintenance. Figure 1 The guide mechanism shown only requires pinching the tail of the guide pin plastic sleeve 5 to remove it from the head of the guide pin dust cover 4, revealing the hexagonal socket 11 of the guide pin 3. Then, pull the guide pin dust cover 4 along the direction of the guide pin hole, and easily loosen and remove the guide pin 3 with an Allen wrench. This allows the caliper body 2 to be flipped over, enabling brake pad replacement. This invention allows for after-sales maintenance of the brake caliper without disassembling the wheel. It facilitates installation and disassembly for after-sales maintenance of motorcycle brake calipers.

[0041] The smooth end 10 of the guide pin 3 is coated with a low-friction coefficient wear-resistant coating to reduce the sliding resistance between the guide pin and the guide pin dust cover.

[0042] The dust cover 4 of the guide pin and the guide pin hole are interference fit, with an interference amount between 0.35-0.75mm.

[0043] like Figure 3As shown, the guide pin dust cover 4 is made of rubber, with multiple flexible corrugated tube sections evenly distributed along the inner wall in the middle, a total of 9 sections, each 1.5mm thick. This is mainly to take into account the axial movement of the brake caliper along the guide pin 3, i.e., movement in the positive and negative X directions. The friction between the metal and rubber brings very little sliding resistance, thereby reducing drag torque and more effectively suppressing impact noise between the caliper body, brake pads, and pins on bumpy roads.

[0044] In practice, during installation, first install the threaded end of the guide pin onto the connecting plate. Then, slowly and evenly press the thin edge of the guide pin dust cover head into the guide pin hole of the clamp body. The telescopic end of the guide pin dust cover will fit the guide pin inside. Finally, press the guide pin plastic sleeve into the head end of the guide pin dust cover to achieve an interference fit. The final assembled product looks like... Figure 8 As shown.

[0045] This invention provides a guide mechanism for motorcycle disc brake calipers, replacing the traditional guide mechanism. It changes the traditional metal-to-metal sliding friction to lubricated friction between metal and rubber, thus optimizing the guide path. In a specific implementation, a static drag test was conducted on the brake caliper structure of this invention, and the data obtained are shown in the table below: Static drag data As can be seen from the above table and graph data, the static drag measured data and curves of the present invention show that the drag torque is approximately zero and the effect is stable.

[0046] Therefore, this invention solves the technical problems of existing motorcycle disc brake calipers, such as large drag torque, rapid wear of sliding components, poor corrosion resistance, and abnormal noise.

Claims

1. A guide mechanism for a motorcycle disc brake caliper, comprising a connecting plate (1) fixed to a front fork or a rear swingarm and a caliper body (2) slidably mounted on the connecting plate (1), characterized in that: It also includes: The guide pin (3) has a threaded end (9) at one end, which is fixedly connected to the connecting plate (1) by a threaded connection, and a smooth end (10) at the other end, which is fitted into the guide pin hole on the clamp body (2). A guide pin dust cover (4) is fitted between the guide pin hole and the guide pin (3) of the clamp body (2) to seal the gap between the guide pin (3) and the guide pin hole; The guide pin plastic sleeve (5) is arranged at one end of the guide pin dust cover (4) where the smooth end (10) of the guide pin (3) is located and is engaged by pressing.

2. The guide mechanism for motorcycle disc brake calipers according to claim 1, characterized in that: The clamp body (2) is provided with guide pin holes for the guide pin (3) and guide pin dust cover (4) to pass through. The guide pin dust cover (4) is fitted in the guide pin holes, and the smooth end (10) of the guide pin (3) is fitted into the guide pin dust cover (4) with clearance fit.

3. The guide mechanism for motorcycle disc brake calipers according to claim 1, characterized in that: One end of the guide pin dust cover (4) serves as a telescopic end, which is fixedly embedded in the guide pin (3) to form a seal; the other end of the guide pin dust cover (4) serves as a head end, which passes through the guide pin hole of the clamp body (2) and is axially limited and fixed to the end face of the guide pin hole by a buckle structure.

4. The guide mechanism for motorcycle disc brake calipers according to claim 1, characterized in that: The guide pin dust cover (4) has an annular groove on the inner wall of the end hole as a cover annular slot (6) at the head end. The guide pin plastic sleeve (5) has a flange on the outer periphery of the port as a sleeve flange (12). The sleeve flange (12) is fixedly nested in the cover annular slot (6) at the head end of the guide pin dust cover (4) to form a seal.

5. The guide mechanism for motorcycle disc brake calipers according to claim 3, characterized in that, The guide pin (3) has an annular groove as a pin annular slot (7), and the telescopic end of the guide pin dust cover (4) is embedded in the pin annular slot (7).

6. The guide mechanism for motorcycle disc brake calipers according to claim 3, characterized in that, The guide pin (3) has an outer flange between the connecting plate (1) and the clamp body (2), and the stepped surface on one side of the outer flange and the connecting plate (1) are in close contact to form an installation positioning surface (8).

7. The guide mechanism for motorcycle disc brake calipers according to claim 6, characterized in that, The outer flange is provided with a pin annular groove (7) for connecting the guide pin dust cover (4) next to the step surface on the other side.

8. The guide mechanism for motorcycle disc brake calipers according to claim 1, characterized in that, The smooth end (10) of the guide pin (3) has an internal hexagonal hole (11) for disassembly and installation.

9. The guide mechanism for motorcycle disc brake calipers according to claim 1 or 2, characterized in that, The guide pin dust cover (4) and the guide pin hole are interference fit.

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