Four-cylinder disc brake assembly

Abstract

The utility model discloses a four-cylinder disc brake assembly. The four-cylinder disc brake assembly comprises a split type caliper body, two groups of oppositely-arranged four pistons which are symmetrically distributed, a slidable brake pad and an elastic reset structure, the piston is hydraulically driven to compress the spring to pre-press the brake pad, so that the braking force is gradually increased, and then the end face of the piston is attached to increase pressure to avoid instant locking; and during non-braking, the spring and the shifting elastic sheet are reset cooperatively. The problems that a double-cylinder disc brake of a large-displacement motorcycle is insufficient in braking force, poor in stability and delayed in reset are solved, and the double-cylinder disc brake is suitable for a high-speed braking scene and has high control precision and heat dissipation performance.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle braking technology, and in particular to a four-cylinder disc brake assembly suitable for high-speed braking scenarios of large-displacement motorcycles. Background Technology

[0002] Disc brake assemblies achieve braking by having pistons inside the caliper push brake pads on both sides to clamp the disc. Their core structure consists of the caliper body, guide pins to constrain the caliper's axial sliding, hydraulically driven piston assembly, brake pad friction braking, and a heat dissipation structure to suppress heat fade. High-displacement motorcycles, which can travel at high speeds, require a large braking torque during braking. Existing dual-cylinder, dual-piston disc brake assemblies suffer from insufficient braking torque, poor stability, and the direct hydraulic drive of the pistons is prone to sudden changes in braking force and reset delays, making them unsuitable for the high-speed braking demands of high-displacement motorcycles.

[0003] Specific issues include:

[0004] 1. Insufficient braking force: The dual-piston structure cannot provide sufficient braking torque;

[0005] 2. Poor stability: Sudden changes in hydraulic pressure can easily cause brake vibration;

[0006] 3. Low control precision: Piston reset delay affects continuous braking effect. Utility Model Content

[0007] To address the aforementioned problems, the purpose of this utility model is to provide a four-cylinder disc brake assembly that, through a split caliper, opposed four-piston gradient boosting and elastic reset structure, achieves progressively increased braking force, avoids instantaneous lock-up, and improves braking stability and reset response speed.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a four-cylinder disc brake assembly, comprising: a split caliper body, wherein two sets of piston groups are symmetrically arranged inside the caliper along the diameter of the disc, each set of piston groups contains two opposing pistons, the pistons being barrel-shaped and having their openings facing the back of the brake pads;

[0009] The disc, with its edges held between symmetrically distributed brake pads;

[0010] The mounting plate is connected to the motorcycle frame, and the caliper body is fixed to the mounting plate with screws.

[0011] The brake pad is positioned and slidable by the guide groove on the caliper body. Its upper end is sleeved on the guide pin and a spring groove is provided on its back. A release spring is fixed on the guide pin.

[0012] A spring is positioned between the spring groove of the brake pad and the inner bottom surface of the piston. The intersection of the dividing lines of the brake pads of the two piston assemblies coincides with the center of the disc. When braking, hydraulic oil drives the piston to move. The spring first contacts the brake pad to gradually increase the braking force. Then, the piston end face adheres to the brake pad to form the maximum braking force. When the brake is released, the spring and the release spring push the brake pad and piston back to their original positions.

[0013] The caliper body has a symmetrical split double-shell structure.

[0014] The piston assembly consists of two groups, each containing two opposed pistons.

[0015] The release spring is fixed on the guide pin and located between the two brake pads.

[0016] The brake pad includes a backing plate and a friction material layer. A heat-conducting sheet is inserted between the friction material layer and the backing plate. One end of the heat-conducting sheet is bent into a bend, and heat dissipation holes are provided on the peripheral wall of the bend.

[0017] Braking principle:

[0018] Initial stage: Hydraulic oil drives the piston to move, the spring contacts the brake pads first, and the braking force gradually increases;

[0019] Maximum braking force: The piston end face fits against the brake pad, providing dual-pressure braking;

[0020] Reset phase: When the brake is released, the spring and the release spring push the brake pads and piston back to their original positions quickly.

[0021] The beneficial effects of this utility model are:

[0022] 1. Gradient braking force: Two-stage pressurization of spring preload and piston contact to avoid instantaneous lock-up;

[0023] 2. High stability: The symmetrical distribution of four pistons improves braking torque and balance;

[0024] 3. Fast response: The release spring and spring work together to reset, reducing the delay;

[0025] 4. Heat dissipation optimization: Brake pad heat dissipation grooves suppress heat fade.

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of a specific embodiment of the present utility model;

[0028] Figure 2 This is an exploded structural diagram of a specific embodiment of the present invention;

[0029] Figure 3 This is a partial cross-sectional view of a specific embodiment of the present utility model;

[0030] Figure 4 This is a structural diagram of the brake pad in a specific embodiment of the present invention.

[0031] Explanation of reference numerals in the attached drawings: 1-caliper body; 2-disc; 3-mounting plate; 4-brake pad; 5-screw; 6-piston assembly; 61-piston; 7-guide pin; 8-release spring; 9-spring; 11-guide groove; 41-spring groove; 43-back plate; 42-friction material layer; 10-heat conduction plate; 101-bent section. Detailed Implementation

[0032] The present invention will be described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0033] like Figure 1 — Figure 4 As shown, this embodiment discloses a four-cylinder disc brake assembly, including:

[0034] The split caliper body 1 has two sets of piston groups 6 symmetrically arranged inside along the diameter of the disc 2. Each set of piston groups 6 includes two opposing pistons 61. The split caliper body 1 is provided with a hydraulic chamber for the pistons 61 to move. A sealing ring is provided between the pistons 61 and the inner wall of the hydraulic chamber. The pistons 61 are barrel-shaped and their openings face the back of the brake pads 4.

[0035] The disc 2 has its edges held between symmetrically distributed brake pads 4;

[0036] Mounting bracket 3 is connected to the motorcycle frame, and the caliper body 1 is fixed to mounting bracket 3 by screws 5;

[0037] Brake pad 4 is positioned and slidable by guide groove 11 on caliper body 1. Its upper end is sleeved on guide pin 7 and spring groove 41 is provided on the back. A release spring 8 is fixed on guide pin 7.

[0038] Spring 9 is positioned between the spring groove 41 of brake pad 4 and the inner bottom surface of piston 61. The intersection of the dividing lines of the brake pads of the two piston groups coincides with the center of disc 2. During braking, hydraulic oil drives piston 61 to move. Spring 9 first contacts brake pad 4 to gradually increase braking force. Then, the end face of piston 61 adheres to brake pad 4 to form maximum braking force. When the brake is released, spring 9 and release spring 8 push brake pad 4 and piston 61 back to their original positions.

[0039] The caliper body 1 is a symmetrical split double-shell structure.

[0040] The brake pad 4 is provided with heat dissipation grooves.

[0041] The number of piston groups 6 is two groups, each group containing two opposed pistons 61.

[0042] The release spring 8 is fixed on the guide pin 7 and located between the two brake pads 4.

[0043] Key structure:

[0044] The intersection of the dividing lines of the brake pads in the two-piston assembly coincides with the center of the disc 2, so that the disc is subjected to balanced force during braking, thus improving braking stability.

[0045] The brake pad 4 has a spring groove 41 on the back, which cooperates with the spring 9 on the inner bottom surface of the piston 61 to provide pre-pressure so that the brake pad gradually contacts the disc.

[0046] The brake pad 4 includes a back plate 43 and a friction material layer 42. A heat-conducting sheet 10 is inserted between the friction material layer 42 and the back plate 43. The outward end of the heat-conducting sheet 10 is bent into a bent portion 101. Heat dissipation holes are provided on the peripheral wall of the bent portion 101, so that heat dissipation can be quickly dissipated during driving, effectively enhancing heat dissipation and suppressing heat decay. At the same time, the bent portion 101 can block some dust from entering the insert body.

[0047] Braking principle:

[0048] Initial stage: Hydraulic oil drives piston 61 to move, spring 9 first contacts brake pad 4, and braking force gradually increases;

[0049] Maximum braking force: Piston 61 end face fits against brake pad 4, dual pressure braking;

[0050] Reset phase: When the brake is released, the spring 9 and the release spring 8 push the brake pad 4 and piston 61 to return to their original positions quickly.

[0051] By adopting the above technical solution, the following technical effects can be achieved:

[0052] 1. Gradient braking force: Two-stage pressurization of spring preload and piston contact to avoid instantaneous lock-up;

[0053] 2. High stability: The symmetrical distribution of four pistons improves braking torque and balance;

[0054] 3. Fast response: The release spring and spring work together to reset, reducing the delay;

[0055] 4. Heat dissipation optimization: Brake pad heat dissipation grooves suppress heat fade.

Claims

1. A four-cylinder disc brake assembly, characterized by The utility model relates to a disc brake, comprising: a split caliper body (1) having two sets of piston groups (6) arranged symmetrically along the diameter of a disc (2), each set of piston groups (6) comprising two opposed pistons (61), the pistons (61) being barrel-shaped and having openings facing the back of brake pads (4); a disc (2) having its edges clamped between symmetrically distributed brake pads (4); a mounting plate (3) connected to the motorcycle frame, the caliper body (1) being fixed to the mounting plate (3) by screws (5); brake pads (4) positioned and sliding through guide grooves (11) on the caliper body (1), the upper end of each brake pad (4) being sleeved on a guide pin (7) and having a spring groove (41) on its back, the guide pin (7) having a push-off spring (8) fixed thereon; a spring (9) arranged between the spring groove (41) of each brake pad (4) and the inner bottom surface of each piston (61); wherein the intersection of the center lines of the brake pads of the two piston groups coincides with the center of the disc (2), when braking, hydraulic oil drives the pistons (61) to move, the spring (9) first contacts the brake pad (4) to gradually increase the braking force, then the end surface of the piston (61) is in contact with the brake pad (4) to form the maximum braking force, when releasing the brake, the spring (9) and the push-off spring (8) push the brake pad (4) and the piston (61) back to the original position.

2. The four-piston disc brake assembly of claim 1, wherein: The caliper body (1) is a symmetric split double-shell structure.

3. The four-piston disc brake assembly of claim 1, wherein: The number of piston groups (6) is two, each group comprising two opposed pistons (61).

4. The four-piston disc brake assembly of claim 1, wherein: The push-off spring (8) is fixed on the guide pin (7) and located between the two brake pads (4).

5. The four-piston disc brake assembly of claim 1, wherein: The brake pad (4) comprises a back plate (43) and a friction material layer (42), a heat-conducting sheet (10) being inserted between the friction material layer (42) and the back plate (43), one end of the heat-conducting sheet (10) being bent and rolled into a bent and rolled portion (101), the peripheral wall of the bent and rolled portion (101) being provided with heat dissipation holes.

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