Double-piston disc brake calipers

Abstract

The utility model discloses a double-piston disc brake caliper which comprises a caliper body, a guide assembly, a piston set and a brake pad. The sliding resistance of the guide assembly is reduced through a self-lubricating bushing; the piston group is provided with a conical chamfer, so that return delay is solved; the brake pad is made of a ceramic-based material. The problems of guide clamping stagnation and brake dragging are effectively solved, the brake smoothness is improved, and the response speed is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to motorcycle brake system technical field, concretely relates to a kind of double-piston disc brake caliper structures for solving the problem of brake performance decline caused by traditional double-piston disc brake guiding jam, piston return delay. BACKGROUND

[0002] Motorcycle double-piston disc brake is realized braking by the double-piston in caliper inner pushing two sides brake pad clamping disc, its core structure is caliper body, guiding pin (constraint caliper axial sliding), piston group (hydraulic drive), brake pad (friction braking) and heat dissipation structure (inhibit heat attenuation).In prior art, guiding pin is easily jammed due to insufficient lubrication, which causes caliper eccentric wear;Brake pad and disc collision are prone to abnormal noise.The above problems seriously affect the smoothness, reliability and safety of braking. SUMMARY

[0003] To solve the above problems, the purpose of the utility model is to provide a kind of double-piston disc brake caliper, brake pad is optimized by guiding assembly, guiding jam, abnormal noise are solved, and braking smoothness, response speed and durability are improved.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of double-piston disc brake caliper, including caliper body, guiding assembly, piston group and brake pad;Caliper body is symmetrical shell, shell is connected into a whole by connecting bolt, hydraulic cavity and brake pad installation groove are arranged in shell, piston group is arranged in hydraulic cavity, piston group includes 2 opposite pistons, and is symmetrically arranged in hydraulic cavity, the front end of piston is conical chamfer, and the rear end is in contact with the back of brake pad, the end surface of piston is configured with brake pad in contact;Guiding assembly includes guiding pin, is arranged in guiding hole on caliper body, and self-lubricating bushing is sleeved on the outer periphery of guiding pin;Self-lubricating bushing is installed on caliper body and brake pad for guiding pin to pass through, compression spring is sleeved on guiding pin, the compression spring is arranged between two brake pads, and the brake pad is driven into contact with piston, and sealing ring is arranged between piston and the inner wall of caliper body;Brake pad includes metal back plate and ceramic base friction block, and sound-absorbing sheet is arranged between back plate and ceramic base friction block, and 15 °-30 ° chamfer is arranged on the edge of friction block.

[0005] Guiding pin is stainless steel or steel rod with surface carburizing treatment, self-lubricating bushing is copper alloy matrix filled with polytetrafluoroethylene PTFE, and the gap between guiding pin and self-lubricating bushing is 0.05-0.1mm.

[0006] It also includes dust cover, dust cover is plastic material, the two sides of dust cover are respectively provided with downward bending clamping block, the outer wall of caliper body is provided with clamping groove for clamping block, and the dust cover is buckled on the caliper body and covers the gap between the two brake pads. Thus, dust is prevented from entering the piston and brake pad, and the brake is avoided from being affected.

[0007] The utility model discloses the beneficial effect is:

[0008] 1, the guidance smoothness promotion: the self-lubricating bushing of the guide pin outer periphery reduces the friction coefficient through PTFE filling, and the cooperation gap design avoids the card stagnation, and the caliper sliding resistance reduces when braking, and the brake pad eccentric wear is eliminated.

[0009] 2, the abnormal sound suppression: the chamfer design of friction block reduces the initial contact impact, and the ceramic base material reduces the high temperature friction coefficient fluctuation, and the high frequency scream is suppressed in combination sound-absorbing sheet.

[0010] 3, piston return smooth: the contact surface between piston and hydraulic cavity inner wall can be reduced by the conical chamfer of piston, and the friction is reduced, thereby solving the return delay problem.

[0011] The utility model will be further described below in combination with the specific embodiment and the drawing. DRAWINGS

[0012] Figure 1 It is the perspective view of the specific embodiment of the utility model;

[0013] Figure 2 It is the explosion drawing of the specific embodiment of the utility model;

[0014] Figure 3 It is the cutaway view of the specific embodiment of the utility model.

[0015] The drawing mark explanation: 1-caliper body;2-guide assembly;21-guide pin;22-self-lubricating bushing;3-piston group;31-piston;311-conical chamfer;32-seal ring;4-brake pad;41-brake pad;411-back plate;412-friction block;5-dust cover;51-clamping block;10-clamping groove. SPECIFIC EMBODIMENT

[0016] The utility model will be further described below in combination with the specific embodiment and the drawing.

[0017] As Figure 1 — Figure 3As shown, the embodiment discloses a double-piston disc brake caliper, which comprises a caliper body 1, a guide assembly 2, a piston group 3 and brake pads 4; the caliper body 1 is a symmetrical shell, the shells are connected into an integral body through connecting bolts, a hydraulic cavity and a brake pad mounting groove are arranged in the shell, the piston group 3 is arranged in the hydraulic cavity, the piston group 3 comprises two opposed pistons 31 which are symmetrically arranged in the hydraulic cavity, the front end of the piston 31 is a conical chamfer 311, the rear end is in contact with the back surface of the brake pad 4, the conical chamfer 311 can reduce the contact surface between the piston and the inner wall of the hydraulic cavity, reduce friction, thereby solving the delay of return, and the end surface of the piston 31 is configured to contact the brake pad 4; the guide assembly 2 comprises a guide pin 21 which is arranged in a guide hole of the caliper body 1, and a self-lubricating bushing 22 is arranged on the outer periphery of the guide pin 21; the self-lubricating bushing 22 is arranged on the caliper body 1 and the brake pad 4 for the guide pin 21 to pass through, a compression spring is sleeved on the guide pin 21, the compression spring is arranged between the two brake pads 4, drives the brake pad to contact the piston 31, and a sealing ring 32 is arranged between the piston 31 and the inner wall of the caliper body 1; the brake pad 4 comprises a metal back plate 41 and a ceramic-based friction block 42, a sound-absorbing sheet is arranged between the back plate 41 and the ceramic-based friction block, and a 15°-30° chamfer is arranged on the edge of the friction block 412.

[0018] The guide pin 21 is a stainless steel or carburized steel rod, the self-lubricating bushing 22 is a copper alloy base filled with polytetrafluoroethylene PTFE, and the gap between the guide pin 21 and the self-lubricating bushing 22 is 0.05-0.1 mm.

[0019] Further comprising a dust cover 5, the dust cover 5 is made of plastic, both sides of the dust cover 5 are respectively provided with downwardly bent clamping blocks 51, the outer wall of the caliper body 1 is provided with clamping grooves 10 for clamping the clamping blocks, and the dust cover 5 is clamped on the caliper body 1 and covers the gap between the two brake pads 4, thereby preventing dust from entering the piston and the brake pad and avoiding affecting braking.

[0020] Through bench test verification:

[0021] Guiding resistance: the sliding friction of the guide pin is reduced from 25 N to 10 N (reduced by 60%) at room temperature;

[0022] Abnormal sound test: no screaming and vibration acceleration is reduced from 2 g to 0.5 g (reduced by 75%) during cold start and low-speed braking (10-20 km / h).

[0023] Therefore, by adopting the above technical scheme, the following technical effects can be achieved:

[0024] 1. Improved guiding smoothness: the self-lubricating bushing on the outer periphery of the guide pin reduces the friction coefficient (from 0.15 to 0.05) through PTFE filling, and the gap design avoids jamming, the sliding resistance of the caliper is reduced by more than 50% during braking, and brake pad eccentric wear is eliminated.

[0025] 2. Abnormal sound suppression: The chamfer design of the friction block reduces the initial contact impact, the ceramic-based material reduces the high-temperature friction coefficient fluctuation (decay <10%), and the combination of the sound-absorbing sheet (optionally equipped with nitrile rubber modified polyamide) suppresses high-frequency squeal.

[0026] 3. Smooth piston return: The conical chamfer of the piston can reduce the contact area between the piston and the inner wall of the hydraulic cavity, reducing friction and thus solving the problem of delayed return.

Claims

1. A dual piston disc brake caliper characterized by: Including caliper body (1), guide assembly (2), piston group (3) and brake pad (4); The caliper body (1) is symmetrical housing, and the housing is connected into an organic whole by connecting bolt, and the housing is provided with hydraulic cavity and brake pad mounting groove, piston group (3) is arranged in the hydraulic cavity, the piston group (3) includes two opposing pistons (31), and is symmetrically arranged in the hydraulic cavity, the front end of the piston (31) is conical chamfer (311), the rear end is in contact with the back of brake pad (4), and the end face of the piston (31) is configured with brake pad (4) in contact; The guide assembly (2) includes guide pin (21), and is provided with guide hole on the caliper body (1), and the outer periphery of the guide pin (21) is provided with self-lubricating bushing (22); The self-lubricating bushing (22) is installed on the caliper body (1) and brake pad (4) for the guide pin (21) to pass through, the guide pin (21) is sleeved with compression spring, the compression spring is arranged between the two brake pads (4), drives the brake pad to contact with the piston (31), and the piston (31) and the inner wall of the caliper body (1) are provided with sealing ring (32); The brake pad (4) includes metal back plate (41) and ceramic-based friction block (42), and the back plate (41) and the ceramic-based friction block are provided with sound-absorbing sheet, and the edge of the friction block (412) is provided with 15 °-30 ° chamfer.

2. Dual piston disc brake caliper according to claim 1, characterized in that: The guide pin (21) is a stainless steel or surface carburizing treated steel rod, the self-lubricating bushing (22) is a copper alloy base filled with polytetrafluoroethylene, and the gap between the guide pin (21) and the self-lubricating bushing (22) is 0.05-0.1mm.

3. The dual piston disc brake caliper of claim 1 wherein: It also includes dust cover (5), the dust cover (5) is plastic material, the two sides of the dust cover (5) are respectively provided with downward bending clamping block (51), the outer wall of the caliper body (1) is provided with clamping groove (10) that clamping block is clamped, and the dust cover (5) is buckled on the caliper body (1) and is capped above the gap between the two brake pads (4).

Images