Single-piston disc brake calipers of electric vehicle

Abstract

The utility model discloses a single-piston disc brake caliper of an electric vehicle. Braking force gradient adjustment is achieved through a layered piston set (comprising a tower-shaped spring and an embedded rubber small piston). During braking, hydraulic pressure sequentially drives a small protruding column, a large protruding column and a piston body of the small piston to make contact with a brake pad, and braking force sudden change is avoided. And during non-braking, the tower-shaped spring pushes to quickly reset. The problems that in the prior art, the braking force of a rigid piston is uncontrollable, and resetting is delayed are solved, and the braking smoothness and safety are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motorcycle hydraulic brake technical field, concretely relates to a kind of electric vehicle single-piston disc brake caliper. BACKGROUND

[0002] Electric vehicle single-piston disc brake caliper is realized braking by piston inside caliper to push both sides brake pad clamping disc, its core structure is caliper body, guiding pin restricts caliper axial sliding, piston group hydraulic drive, brake pad friction braking and heat dissipation structure inhibits heat attenuation.The piston of existing motorcycle brake system is single rigid structure, hydraulic pressure directly promotes piston to contact brake pad when braking, there is braking force mutation risk and reset delay, and braking process is difficult to accurately control. SUMMARY

[0003] To solve the above problems, the utility model aims at providing a kind of brake clamping structure, braking force gradient adjustment is realized by braking force gradient adjustment, and reset is realized simultaneously.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of electric vehicle single-piston disc brake caliper, including caliper body, guiding pin, piston group and brake pad;The caliper body is symmetrical shell, and the shell is connected into an organic whole by connecting bolt, and hydraulic cavity and brake pad guide slot are arranged in the shell, the guiding pin is provided with a latch after passing through caliper body, and the brake pad is positioned and slides along brake pad guide slot by being set on the guiding pin, the piston group is arranged in the hydraulic cavity, and the piston group includes: the outer wall between piston body and the inner wall of hydraulic cavity is provided with tower spring, the piston body is barrel structure and is embedded with elastic compressible small piston;Small piston is rubber material, one end of which extends from the opening end of the piston body, and the extending part includes coaxially arranged large convex column and small convex column, and the small convex column is arranged on the large convex column;Wherein, when braking, hydraulic pressure drives the piston body to extend, the small piston first contacts brake pad, the small convex column contacts brake pad to generate initial braking force, the large convex column contacts brake pad when the piston body continues to push, and finally the opening end surface of the piston body contacts brake pad, and the braking force reaches maximum;Under non-braking state, the tower spring pushes the piston body to reset;Small piston and the inner wall of the piston body gap fit, and the large convex column and the small convex column form caliper contact with brake pad.

[0005] The piston body is cylindrical barrel, and the small piston is cylindrical rubber body.

[0006] The diameter of the small convex column is less than the diameter of the large convex column.

[0007] The outer wall of the piston body is provided with a first spring groove, and the inner wall of the hydraulic cavity is provided with a second spring groove, the smaller end of the tower-shaped spring abuts against the first spring groove, and the larger end of the tower-shaped spring abuts against the second spring groove.

[0008] The utility model has the advantages of:

[0009] 1. The double convex column design of the small piston realizes brake force gradient adjustment, improves control precision, avoids sudden stop during braking, and affects personal safety.

[0010] 2. The small piston made of rubber material can buffer impact and prolong the service life of the brake pad.

[0011] 3. The tower-shaped spring accelerates the reset of the piston body and improves the reset response speed.

[0012] The utility model will be further described below in combination with the drawings and specific embodiments. DRAWINGS

[0013] Figure 1 It is a perspective view of the specific embodiment of the utility model;

[0014] Figure 2 It is a sectional view of the specific embodiment of the utility model;

[0015] Figure 3 It is an exploded view of the specific embodiment of the utility model;

[0016] Figure 4 It is a perspective view of the small piston in the specific embodiment of the utility model;

[0017] Figure 5 It is Figure 2 the enlarged view of A in the middle;

[0018] Reference signs: 1, caliper body; 2, guide pin; 3, piston group; 4, small piston; 5, brake pad; 11, shell; 12, hydraulic cavity; 121, second spring groove; 31, piston body; 311, first spring groove; 32, tower-shaped spring; 41, large convex column; 42, small convex column. EMBODIMENT

[0019] The utility model will be further described below in combination with the drawings and specific embodiments, which is only used for further description of the utility model and cannot be understood as the limitation of the protection scope of the utility model.

[0020] As Figure 1 — Figure 5As shown, the embodiment discloses a single-piston disc brake caliper for electric vehicles, which comprises a caliper body 1, a guide pin 2, a piston group 3 and brake pads 5; the caliper body 1 is a symmetrical shell 11, which is connected into an integrated body by connecting bolts, and is internally provided with a hydraulic cavity 12 and a brake pad guide groove; the guide pin 2 is provided with a plug after penetrating through the caliper body, and the brake pads 5 are sleeved on the guide pin 2 and are positioned and slid along the brake pad guide groove; a disengaging spring is further fixed on the guide pin 2, which is arranged between the two brake pads to separate the two brake pads when not braking; the piston group 3 is arranged in the hydraulic cavity 12, and comprises: a piston body 31, which is provided with a tower-shaped spring 32 between its outer wall and the inner wall of the hydraulic cavity 12; the piston body 31 is a barrel-shaped structure and internally embedded with an elastic and compressible small piston 4; the small piston 4 is made of rubber, one end of which extends out of the open end of the piston body 31, and the extending part comprises a large protruding column 41 and a small protruding column 42 arranged coaxially, and the small protruding column 42 is arranged on the large protruding column 41; when braking, the hydraulic pressure drives the piston body 31 to extend, the small piston 4 first contacts the brake pad 5, the small protruding column 42 contacts the brake pad 5 to generate an initial braking force, the large protruding column 41 contacts the brake pad 5 when the piston body 31 continuously pushes forward, and finally the open end surface of the piston body 31 contacts the brake pad 5, so that the braking force reaches the maximum; in the non-braking state, the tower-shaped spring 32 pushes the piston body 31 to reset; the small piston 4 is gap-fitted with the inner wall of the piston body 31, and the large protruding column 41 and the small protruding column 42 form a caliper contact with the brake pad 5.

[0021] The piston body 31 is a cylindrical barrel, and the small piston 4 is a cylindrical rubber body.

[0022] The diameter of the small protruding column 42 is smaller than that of the large protruding column 41.

[0023] An annular first spring groove 311 is arranged on the outer wall of the piston body 31, an annular second spring groove 121 is arranged on the inner wall of the hydraulic cavity 12, the smaller end of the tower-shaped spring 32 abuts against the first spring groove 311, and the larger end of the tower-shaped spring 32 abuts against the second spring groove 121. The tower-shaped spring 32 is positioned by the first / second spring groove. The braking force is adjusted in three stages to avoid sudden change and improve control accuracy.

[0024] An inclined guide surface is arranged on the first / second spring groove respectively, so that the tower-shaped spring extends and retracts along the guide surface to improve stability.

[0025] When braking, the hydraulic oil pushes the piston body 31 to move, the small piston 4 first contacts the brake pad 5 through the small protruding column 42, then the large protruding column 41 contacts the brake pad 5, and finally the end surface of the piston body 31 is attached to the brake pad 5, so that the braking force is gradually increased in stages to avoid instantaneous locking; when the brake is released, the tower-shaped spring 32 pushes the piston body 31 to quickly reset.

[0026] The above technical scheme can achieve the following technical effects:

[0027] 1. The brake force gradient adjustment is realized by the double convex column design of the small piston, the control precision is improved, and the sudden stop during braking is avoided, which affects the personal safety;

[0028] 2. The small piston made of rubber material buffers the impact, prolonging the service life of the brake pad;

[0029] 3. The tower-shaped spring accelerates the reset of the piston body, improving the reset response speed.

Claims

1. An electric vehicle single-piston disc brake caliper, comprising a caliper body (1), a guide pin (2), a piston group (3) and a brake pad (5); the caliper body (1) is a symmetrical shell (11), the shells (11) are connected into an integrated body by connecting bolts, the shells (11) are internally provided with a hydraulic chamber (12) and a brake pad guide groove, the guide pin (2) is provided with a plug after penetrating through the caliper body, the brake pad (5) is sleeved on the guide pin (2) and is positioned and slid along the brake pad guide groove, the piston group (3) is arranged in the hydraulic chamber (12), characterized in that, The piston group (3) comprises: a piston body (31) provided with a tower-shaped spring (32) between its outer wall and the inner wall of the hydraulic cavity (12), the piston body (31) is a barrel structure and internally embedded with an elastic and compressible small piston (4); the small piston (4) is made of rubber, one end of which extends out of the open end of the piston body (31), and the extending part comprises a large protruding column (41) and a small protruding column (42), the small protruding column (42) is arranged on the large protruding column (41); in the non-braking state, the tower-shaped spring (32) pushes the piston body (31) to reset; the small piston (4) is in clearance fit with the inner wall of the piston body (31).

2. The electric vehicle single piston disc brake caliper of claim 1, wherein, The piston body (31) is a cylindrical barrel, and the small piston (4) is a cylindrical rubber body.

3. The electric vehicle single piston disc brake caliper of claim 1, wherein, The diameter of the small protruding column (42) is smaller than that of the large protruding column (41).

4. The electric vehicle single piston disc brake caliper of claim 1, wherein, The outer wall of the piston body (31) is provided with an annular first spring groove (311), the inner wall of the hydraulic cavity (12) is provided with an annular second spring groove (121), the smaller end of the tower-shaped spring (32) abuts in the first spring groove (311), and the larger end of the tower-shaped spring (32) abuts in the second spring groove (121).

Images