CN215567555U

CN215567555U - Hydraulic brake device and bicycle

Info

Publication number: CN215567555U
Application number: CN202121995551.8U
Authority: CN
Inventors: 马士峰
Original assignee: Shenzhen Dengfenghua Metal Manufacturing Co ltd
Current assignee: Shenzhen Dengfenghua Metal Manufacturing Co ltd
Priority date: 2021-08-23
Filing date: 2021-08-23
Publication date: 2022-01-18
Anticipated expiration: 2031-08-23

Abstract

The utility model discloses a hydraulic brake device and a bicycle, the hydraulic brake device comprises a body fixed to a bicycle body, a piston and a sealing ring, the piston and the sealing ring are arranged on the body, the body is provided with a groove for inserting a brake disc and a flow channel for flowing brake fluid, two opposite groove walls of the groove are respectively recessed to form brake cavities communicated with the flow channel, each brake cavity comprises a bottom wall and a cylindrical side wall, the cylindrical side wall is provided with an annular accommodating groove, the piston is arranged in the brake cavity and can move along the axial direction of the brake cavity, the sealing ring is accommodated in the annular accommodating groove and is arranged on the piston in a sealing manner, the axial cross sections of the annular accommodating groove and the sealing ring are rectangular, the piston comprises a first end facing the bottom wall and a second end far away from the bottom wall, the periphery of the first end is provided with an avoiding part, the avoiding part comprises a starting end close to the bottom wall and a tail end far away from the bottom wall, and the avoiding part is arranged in the radial direction of the brake cavity, the size of the starting end is smaller than the size of the end. The hydraulic brake device disclosed by the utility model is low in processing difficulty and good in sealing effect.

Description

Hydraulic brake device and bicycle

Technical Field

The utility model relates to the technical field of vehicle braking, in particular to a hydraulic brake device and a bicycle.

Background

The brake system is a component for ensuring the safety of passengers on the vehicle and is indispensable on all vehicles. The brake system of the bicycle is gradually changed from a stay-supported disc brake to a hydraulic disc brake, wherein the hydraulic disc brake uses oil as a transmission material, and the oil is compressed by a piston rod, so that a piston provided with a brake pad is driven to move, the brake pad clamps the brake disc, and the brake effect is realized. Because the braking mode uses oil as a transmission substance, the requirement on the sealing performance is very strict.

At present, in order to enhance the sealing performance of a hydraulic disc brake, an annular groove is usually arranged in the side wall of a mounting hole for mounting a piston, a sealing ring is mounted in the annular groove, and the radial depth of the annular groove is slightly smaller than the radial size of the sealing ring, so that a part of the sealing ring protrudes into the mounting hole for mounting the piston, when the piston is mounted in the mounting hole, the piston penetrates through the sealing ring and tightly presses the sealing ring in the annular groove, and the sealing effect is realized.

However, since the inner diameter of the sealing ring is smaller than the diameter of the piston, it is difficult to pass the piston through the sealing ring when the piston is installed, and even push the sealing ring out of the annular groove. To solve this problem, almost all solutions on the market today are to provide a bevel on the radially outer side wall of the annular groove, i.e. the side close to the mounting hole, when machining the annular groove, to increase the radial depth of the annular groove at that location. When the piston penetrates through the sealing ring and extrudes the sealing ring radially outwards, the sealing ring can deform radially outwards to avoid towards the inclined plane, so that the piston can conveniently penetrate through the sealing ring. However, the size of the annular groove is small, so that the difficulty in processing the inclined plane in the annular groove is high, the production difficulty of the hydraulic brake device is increased, and the part of the sealing ring corresponding to the inclined plane cannot be tightly attached to the piston, so that only part of the inner side surface of the sealing ring is tightly attached to the outer surface of the piston, and the sealing effect of the sealing ring is reduced.

SUMMERY OF THE UTILITY MODEL

In view of the above, the utility model provides a hydraulic brake device capable of reducing the production difficulty and ensuring the sealing effect;

the utility model also provides a bicycle using the hydraulic brake device.

A hydraulic brake device comprises a body, a piston and a sealing ring, wherein the body is used for being fixed to a vehicle body, the piston and the sealing ring are arranged on the body, a groove for inserting a brake disc and a flow channel for flowing brake fluid are formed in the body, two opposite groove walls of the groove are respectively recessed to form brake cavities communicated with the flow channel, each brake cavity comprises a bottom wall and a cylindrical side wall, an annular accommodating groove is formed in the cylindrical side wall, the piston is arranged in the brake cavity and can move along the axial direction of the brake cavity, the sealing ring is accommodated in the annular accommodating groove and hermetically sleeved on the piston, the axial cross sections of the annular accommodating groove and the sealing ring are rectangular, the piston comprises a first end facing the bottom wall and a second end far away from the bottom wall, an avoiding part is arranged on the periphery of the first end, and the avoiding part comprises a starting end close to the bottom wall and a tail end far away from the bottom wall, in a radial direction of the brake chamber, a size of the starting end is smaller than a size of the end.

In some embodiments, the relief is a bevel disposed on a periphery of the first end of the piston.

In some embodiments, the size of the slope in a radial direction of the brake chamber gradually increases from the starting end to the ending end.

In some embodiments, the bevel is curved.

In some embodiments, the curved surface corresponds to a central angle in the range of 45 ° to 90 °.

In some embodiments, the brake chamber, the annular receiving groove, the sealing ring, and the central axis of the piston are collinear.

In some embodiments, the body includes a first housing and a second housing attached to one side of the first housing, the first housing and the second housing enclose to form the groove, and the two groove walls provided with the braking cavity are respectively located at two opposite sides of the first housing and the second housing.

The utility model also provides a bicycle which comprises a frame, a handle, a hydraulic cylinder and the brake device, wherein the body of the brake device and the handle are both mounted on the frame, and the handle is used for injecting the brake fluid in the hydraulic cylinder into the flow channel to drive the piston to move.

According to the scheme provided by the utility model, the avoiding part is arranged on the piston, so that the radial size of the piston at the position is reduced, the piston can conveniently penetrate through the sealing ring, and the avoiding part is arranged at the periphery of the piston, so that compared with the situation that an inclined plane is arranged in the groove, the processing difficulty can be reduced; meanwhile, the axial sections of the annular accommodating groove and the sealing ring are rectangular, so that after the piston penetrates through the sealing ring, the whole inner side surface of the sealing ring is tightly attached to the outer side surface of the piston, the whole outer side surface of the sealing ring is tightly attached to the inner wall opposite to the annular accommodating groove, the contact area of the sealing ring with the piston and the annular accommodating groove is ensured, and the sealing effect of the sealing ring is ensured.

Drawings

Fig. 1 is a schematic structural diagram of a hydraulic brake device according to an embodiment of the present invention;

FIG. 2 is an exploded schematic view of the hydraulic brake device shown in FIG. 1;

FIG. 3 is a cross-sectional schematic view of the hydraulic brake device shown in FIG. 1 in an exploded state;

fig. 4 is a schematic view of the piston shown in fig. 2.

In the figure: 1. a hydraulic brake device; 10. a body; 20. a piston; 30. a seal ring; 101. a groove; 102. a flow channel; 103. a trench wall; 104. a brake chamber; 105. a bottom wall; 106. a cylindrical sidewall; 107. an annular accommodating groove; 21. a first end; 22. a second end; 211. an avoidance part; 212. a starting end; 213. a terminal end; 11. a first housing; 12. a second housing.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

It should be noted that all directional indicators (such as upper, lower, left, right, front, back, inner, outer, top, bottom … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components in a specific posture (as shown in the figure), and if the specific posture is changed, the directional indicator is changed accordingly.

It will also be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Referring to fig. 1 to 4, a bicycle according to an embodiment of the present invention includes a frame, a handle, a hydraulic cylinder, and a brake device 1, wherein the handle and the brake device 1 are respectively mounted on the frame, and the handle is used for injecting brake fluid in the hydraulic cylinder into the brake device 1 to control the brake device 1 to achieve a braking effect. The bicycle provided by the embodiment to which the hydraulic brake device 1 is applied is not limited to any particular form, and may be a vehicle driven by manpower or electric power, and may be a single wheel, a double wheel or a multi-wheel.

The brake device 1 includes a body 10, a piston 20, and a seal ring 30, the body 10 is fixed to a vehicle body (e.g., a frame of a bicycle), the piston 20 and the seal ring 30 are both mounted to the body 10, the piston 20 is movable relative to the body 10, the seal ring 30 is sealingly sleeved on an outer side of the piston 20, that is, the seal ring 30 is sleeved on the outer side of the piston 20, and there is no gap between the seal ring 30 and the piston 20, so as to prevent brake fluid from leaking out from the gap between the seal ring 30 and the piston 20.

The body 10 is provided with a groove 101 and a runner 102, the groove 101 is used for inserting a brake disc on a bicycle, and the runner 102 is used for allowing brake fluid to flow and is communicated with a hydraulic cylinder. The hydraulic cylinder can be arranged on the brake device 1 and directly communicated with the flow passage 102, or can be arranged on a handle and communicated with the flow passage 102 through a transfusion tube.

The groove 101 is disposed in the middle of the body 10, and two groove walls 103 of the groove 101 opposite to each other are recessed to form a braking cavity 104, the braking cavity 104 is communicated with the flow channel 102, and the piston 20 is movably mounted in the braking cavity 104 and can move along the axial direction of the braking cavity 104. When a user operates a handle of the bicycle, the handle can inject brake fluid in the hydraulic cylinder into the flow passage 102 to increase the pressure inside the flow passage 102, so that the piston 20 is driven by the brake fluid to move outwards along the axial direction of the brake chamber 104 to clamp a brake disc positioned in the groove 101, thereby realizing a braking operation.

The brake chamber 104 includes a bottom wall 105 spaced from the groove wall 103 and a cylindrical side wall 106 extending from the bottom wall 105 to the groove wall 103, an annular receiving groove 107 is formed in the cylindrical side wall 106, the sealing ring 30 is received in the annular receiving groove 107, and a portion of the sealing ring 30 protrudes out of the annular receiving groove 107, i.e., a portion of the sealing ring is located in the brake chamber 104, and the piston 20 penetrates and presses the sealing ring 30, so that the sealing ring 30 is compressed in the annular receiving groove 107.

In the illustrated embodiment, the central axes of the brake chamber 104, the annular receiving groove 107, the seal ring 30, and the piston 20 are collinear.

The axial cross-sections (i.e. the cross-sections passing through the central axis) of the annular receiving groove 107 and the sealing ring 30 are both rectangular, so that after the piston 20 passes through the sealing ring 30, the entire outer side surface (i.e. the side surface away from the central axis) of the sealing ring 30 is tightly attached to the inner wall opposite to the annular receiving groove 107 under the extrusion of the piston 20, and the entire inner side surface is tightly attached to the outer surface of the piston 20, thereby ensuring the contact area between the sealing ring 30 and the piston 20 and the annular receiving groove 107, and ensuring the sealing effect of the sealing ring 30.

The piston 20 comprises a first end 21 facing the bottom wall 105 of the brake chamber 104 and a second end 22 opposite the first end 21, i.e. the first end 21 is located at the end of the piston 20 close to the bottom wall 105 of the brake chamber 104 and the second end 22 is located at the end of the piston 20 remote from the bottom wall 105 of the brake chamber 104. The periphery of the first end 21 is provided with an escape portion 211, the escape portion 211 comprising a starting end 212 close to the bottom wall 105 and a terminal end 213 (see fig. 4) remote from the bottom wall 105, the starting end 212 having a smaller dimension than the terminal end 213 in a radial direction of the brake chamber 104. The relief portion 211 can reduce the radial dimension of the piston 20 at the position, so that the piston 20 can conveniently penetrate through the sealing ring 30, and the assembly of the hydraulic brake device 1 is facilitated; further, since the relief portion 211 is provided on the peripheral edge of the piston 20, the difficulty of processing can be reduced compared to a case where a slope is provided in the groove.

In the illustrated embodiment, the relief portion 211 is a slope provided on the periphery of the first end 21 of the piston 20, and the size of the slope increases gradually in the radial direction of the brake chamber 104 from the starting end 212 to the end 213.

The type of the inclined surface is not limited, and examples thereof include a flat surface and a curved surface. In the illustrated embodiment, the inclined surface is a curved surface, and the central angle corresponding to the curved surface ranges from 45 ° to 90 °. Preferably, the central angle is 90 °.

In the illustrated embodiment, the body 10 includes a first housing 11 and a second housing 12 attached to one side of the first housing 11, the first housing 11 and the second housing 12 enclose a groove 101, two groove walls 103 of the groove 101 having a braking cavity 104 are respectively located on two opposite sides of the first housing 11 and the second housing 12, and a flow passage 102 communicating with the braking cavity 104 is provided on both the first housing 11 and the second housing 12.

In the illustrated embodiment, the first housing 11 and the second housing 12 are respectively provided with a brake chamber 104, the central axes of the two brake chambers 104 are collinear, and each brake chamber 104 is provided with a piston 20. When the user operates the handle, the brake fluid can be used for driving the two pistons 20 to move towards each other so as to clamp the brake disc of the bicycle.

In the above embodiments, the detailed structure and function of the hydraulic brake device 1 are described in connection with a bicycle. The concept of the bicycle should be broadly interpreted as a means of transportation whose braking requirements can be met by the hydraulic brake device 1 described above. Therefore, any means of transportation to which the hydraulic brake device can be applied is within the scope of the bicycle of the present application in terms of both structure and function.

According to the hydraulic brake device, the avoidance part is arranged on the piston, so that the radial size of the piston at the position is reduced, the piston can conveniently penetrate through the sealing ring, and the avoidance part is arranged at the periphery of the piston, so that compared with the situation that an inclined plane is arranged in the groove, the processing difficulty can be reduced; meanwhile, the axial sections of the annular accommodating groove and the sealing ring are rectangular, so that after the piston penetrates through the sealing ring, the whole inner side surface of the sealing ring is tightly attached to the outer side surface of the piston, the whole outer side surface of the sealing ring is tightly attached to the inner wall opposite to the annular accommodating groove, the contact area of the sealing ring with the piston and the annular accommodating groove is ensured, and the sealing effect of the sealing ring is ensured.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. A hydraulic brake device comprises a body for being fixed to a vehicle body, a piston and a sealing ring, wherein the piston and the sealing ring are arranged on the body, the body is provided with a groove for a brake disc to be inserted into and a flow channel for brake fluid to flow, two opposite groove walls of the groove are respectively sunken to form brake cavities communicated with the flow channel, each brake cavity comprises a bottom wall and a cylindrical side wall, the cylindrical side wall is provided with an annular accommodating groove, the piston is arranged in the brake cavity and can move along the axial direction of the brake cavity, the sealing ring is accommodated in the annular accommodating groove and is hermetically sleeved on the piston, the hydraulic brake device is characterized in that the axial cross sections of the annular accommodating groove and the sealing ring are rectangular, the piston comprises a first end facing the bottom wall and a second end far away from the bottom wall, and the periphery of the first end is provided with an avoiding part, the avoiding part comprises a starting end close to the bottom wall and a tail end far away from the bottom wall, and the size of the starting end is smaller than that of the tail end in the radial direction of the brake cavity.

2. The hydraulic brake apparatus of claim 1, wherein the escape portion is a ramp surface provided at a periphery of the first end of the piston.

3. The hydraulic brake device according to claim 2, wherein the size of the slope in the radial direction of the brake chamber gradually increases from the starting end to the ending end.

4. The hydraulic brake device according to claim 2, wherein the inclined surface is a curved surface.

5. The hydraulic brake device according to claim 4, wherein the central angle corresponding to the curved surface is in a range of 45 ° to 90 °.

6. The hydraulic brake device according to claim 1, wherein central axes of the brake chamber, the annular receiving groove, the seal ring, and the piston are collinear.

7. The hydraulic brake device according to any one of claims 1 to 6, wherein the body includes a first housing and a second housing attached to one side of the first housing, the first housing and the second housing enclose the groove, and the two groove walls provided with the braking chamber are respectively located on two opposite sides of the first housing and the second housing.

8. A bicycle, characterized by comprising a frame, a handle, a hydraulic cylinder, and a brake device according to any one of claims 1 to 7, wherein a body of the brake device and the handle are mounted to the frame, and the handle is used for injecting brake fluid in the hydraulic cylinder into the flow passage to drive the piston to move.