A waterproof structure for brakes

Abstract

This utility model discloses a waterproof structure for a brake, relating to the field of brake technology. It includes a fixed base and a brake drum. The fixed base includes a brake base plate and a retaining ring fixedly mounted on the upper surface of the brake base plate. A primary protection component and a secondary protection component are provided between the brake drum and the retaining ring. An assembly component is provided between the brake base plate and the brake drum. The primary protection component includes a protective cylinder fixedly mounted on the outer surface of the brake drum, two limiting grooves formed on the outer surface of the retaining ring, a dustproof rubber ring disposed on the inner wall of the limiting grooves, and a sloping circular groove formed on the inner wall of the protective cylinder. Compared with the prior art, the beneficial effects of this utility model are: the protective cylinder and the dustproof rubber ring form a labyrinth seal; the interference fit waterproof bearing and the wedge-shaped groove rubber sealing ring form a double dynamic seal; and the sloping circular groove can guide water flow out, thereby efficiently waterproofing and dustproofing the device.

Description

Technical Field

[0001] This utility model relates to the field of brake technology, and in particular to a waterproof brake structure. Background Technology

[0002] As a key safety component of automobiles, the performance of drum brakes directly affects driving safety and transportation economic efficiency.

[0003] The existing patent publication number CN206738446U proposes a novel waterproof structure for a drum brake assembly, including a brake drum, a first mounting base plate, and a first water baffle. The first water baffle is welded to the outside of the first mounting base plate. One end of the brake drum is located above the first water baffle and the first mounting base plate, and the lower end of the brake drum is located below the first mounting base plate. A waterproof step is provided at the top of one end of the brake drum, and the top surface of the waterproof step is flush with the upper surface of the first water baffle, with a distance of 2.6 mm between the waterproof step and the first water baffle. A flange is provided on the first mounting base plate, located at one end face of the brake drum, and the flange is inclined upward at an angle of 3°. The top of the flange of the first mounting base plate is bent, and the height difference between the flange and the flange plane is 1.6 mm.

[0004] When water enters from port A, this design can block most of the water from entering the water-blocking groove. After reaching port B, the angled flange and height difference of the first mounting base plate can prevent a large amount of water from entering port C of the brake, but some water will still enter the brake. To address these shortcomings, we propose a waterproof brake structure. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a waterproof brake structure.

[0006] In order to solve the problems existing in the prior art, the present invention adopts the following technical solution: a waterproof structure for a brake, comprising: a fixed base and a brake drum, wherein the fixed base includes a brake base plate and a retaining ring fixedly installed on the upper surface of the brake base plate, wherein a primary protection component and a secondary protection component are provided between the brake drum and the retaining ring, and an assembly component is provided between the brake base plate and the brake drum;

[0007] The primary protection assembly includes a protective cylinder fixedly installed on the outer surface of the brake drum, two limiting grooves opened on the outer surface of the retaining ring, a dustproof rubber ring set on the inner wall of the limiting groove, and a sloping circular groove opened on the inner wall of the protective cylinder. The protective cylinder and the retaining ring form a labyrinth-type sealing structure.

[0008] The secondary protection component includes a bearing that is interference-fitted on the outer surface of the brake drum, and a rubber sealing ring that is fixedly installed on the inner wall of the retaining ring. The outer ring of the bearing and the inner wall of the rubber sealing ring are both provided with matching wedge-shaped grooves.

[0009] Preferably, the inclination angle of the inclined circular groove is 15°-25°.

[0010] Preferably, the bearing is a waterproof deep groove ball bearing.

[0011] Preferably, the assembly component includes a through hole on the upper surface of the brake base plate, a positioning plate rotatably connected to the inner wall of the through hole, three stepped holes arranged in a circumferential array on the upper end of the brake drum, an assembly bolt disposed on the inner wall of the stepped hole, and a threaded hole on the upper end of the positioning plate that is adapted to the assembly bolt, wherein the nut end of the assembly bolt is located in the stepped hole.

[0012] Preferably, the upper end of the positioning disc is fixedly mounted with five screws connected to the vehicle wheel hub in a circular array, and the upper end of the brake drum is provided with a through hole for the screws to pass through.

[0013] Preferably, the retaining ring and the brake base plate are fixed by laser welding.

[0014] Preferably, the included angle of the wedge-shaped groove is 60°±5°.

[0015] Preferably, the dustproof rubber ring has a Shore hardness of 65-75HA, and the gap between the dustproof rubber ring and the inner wall of the protective cylinder is 0.5-1mm.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The protective cylinder and the dustproof rubber ring form a labyrinth seal, and the interference fit waterproof bearing and the wedge groove rubber sealing ring form a double dynamic seal. At the same time, the sloping circular groove can guide the water flow out, thus effectively waterproofing and dustproofing the device. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an undue limitation. In the drawings:

[0019] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0020] Figure 2 This is a cross-sectional view of the present invention;

[0021] Figure 3 This is a three-dimensional schematic diagram of the fixing base of this utility model;

[0022] Figure 4 This is a schematic cross-sectional view of the brake drum of this utility model;

[0023] Figure 5 for Figure 2 Enlarged structural diagram at point A in the middle.

[0024] The numbers in the diagram are: 10 Brake drum, 20 Brake base plate, 21 Retaining ring, 30 Protective cylinder, 31 Dustproof rubber ring, 32 Inclined circular groove, 40 Bearing, 41 Rubber sealing ring, 42 Wedge-shaped circular groove, 50 Positioning plate, 51 Assembly bolt, 60 Screw. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0026] Please see Figure 1-5 This utility model provides a technical solution: a waterproof brake structure, including: a fixed base and a brake drum 10. The fixed base includes a brake base plate 20 and a retaining ring 21 fixedly installed on the upper surface of the brake base plate 20. The retaining ring 21 is fixed to the brake base plate 20 by laser welding. The brake base plate 20 is used to install the brake shoe assembly.

[0027] An assembly assembly is provided between the brake base plate 20 and the brake drum 10. The assembly assembly includes a through hole on the upper surface of the brake base plate 20, a positioning plate 50 rotatably connected to the inner wall of the through hole, three stepped holes arranged in a circumferential array on the upper end of the brake drum 10, an assembly bolt 51 set on the inner wall of the stepped hole, and a threaded hole on the upper end of the positioning plate 50 that is adapted to the assembly bolt 51. The nut end of the assembly bolt 51 is in the stepped hole, so that the inner top wall of the brake drum 10 contacts the upper end of the positioning plate 50. Then, the assembly bolt 51 is screwed into the threaded hole, so that the brake drum 10 can be installed on the positioning plate 50.

[0028] The upper end of the positioning plate 50 is fixedly equipped with five screws 60 connected to the vehicle wheel hub in a circular array. The upper end of the brake drum 10 is provided with a through hole for the screws 60 to pass through. When the brake drum 10 is installed on the positioning plate 50, the screws 60 will pass through the through hole and can be connected to the external car wheel hub as one unit using the screws 60.

[0029] A primary protection assembly and a secondary protection assembly are provided between the brake drum 10 and the retaining ring 21. The primary protection assembly includes a protective cylinder 30 fixedly installed on the outer surface of the brake drum 10, two limiting grooves opened on the outer surface of the retaining ring 21, a dustproof rubber ring 31 set on the inner wall of the limiting groove, and a sloping circular groove 32 opened on the inner wall of the protective cylinder 30. The protective cylinder 30 and the retaining ring 21 form a labyrinth-type sealing structure. The inclination angle of the sloping circular groove 32 is 15°-25°. The Shore hardness of the dustproof rubber ring 31 is 65-75HA. The gap between the dustproof rubber ring 31 and the inner wall of the protective cylinder 30 is 0.5-1mm. When the brake drum 10 is installed on the positioning plate 50, the dustproof rubber ring 31 is located on the inner wall of the protective cylinder 30. The labyrinth-type sealing structure formed by the dustproof rubber ring 31 can prevent a large amount of water and dust from entering the brake drum 10 along the protective cylinder 30. The design of the sloping circular groove 32 can guide water to flow out of the protective cylinder 30.

[0030] The secondary protection component includes a bearing 40 that is interference-fitted onto the outer surface of the brake drum 10, and a rubber sealing ring 41 that is fixedly installed on the inner wall of the retaining ring 21. The bearing 40 is a waterproof deep groove ball bearing. The outer ring of the bearing 40 and the inner wall of the rubber sealing ring 41 are both provided with matching wedge-shaped grooves 42. The included angle of the wedge-shaped grooves 42 is 60°±5°. When the brake drum 10 is installed on the positioning plate 50, the waterproof deep groove ball bearing 40 is press-fitted onto the outer surface of the brake drum 10 with an H7 / p6 grade interference fit, forming the first metal sealing barrier, which can block the penetration of axial contaminants. At the same time, the outer ring of the bearing 40 will contact the rubber sealing ring 41 and squeeze the rubber sealing ring 41 to form a sealing surface. Under the premise of ensuring that the brake drum 10 rotates relative to the brake base plate 20, the device can be further protected against dust.

[0031] Specifically, the working principle and operation method of this utility model are as follows:

[0032] The inner top wall of the brake drum 10 contacts the upper end of the positioning plate 50. The three stepped holes are aligned with the threaded holes. The nut end of the mounting bolt 51 is inserted into the stepped hole. The three mounting bolts 51 are tightened in sequence into the threaded holes of the positioning plate 50 to form an axial fixed connection. Then, the five screws 60 passing through the through hole are fixed to the wheel hub. After the brake drum 10 is installed, the protective cylinder 30 automatically fits into the retaining ring 21. The dustproof rubber ring 31 and the inner wall of the protective cylinder form a labyrinth seal with a gap of 0.8mm. The 22° inclined circular groove 32 completes the drainage channel construction. The waterproof deep groove ball bearing 40 is pressed into the outer surface of the brake drum 10 with an H7 / p6 grade interference fit. Its outer ring wedge-shaped circular groove 42 and the rubber sealing ring 41 form a 60° angle sealing surface.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art based on the technical solution and concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waterproof structure for a brake, characterized in that, include: A fixed base and a brake drum (10) are provided. The fixed base includes a brake base plate (20) and a retaining ring (21) fixedly installed on the upper surface of the brake base plate (20). A primary protection component and a secondary protection component are provided between the brake drum (10) and the retaining ring (21). An assembly component is provided between the brake base plate (20) and the brake drum (10). The primary protection assembly includes a protective cylinder (30) fixedly installed on the outer surface of the brake drum (10), two limiting grooves opened on the outer surface of the retaining ring (21), a dustproof rubber ring (31) set on the inner wall of the limiting groove, and a sloping circular groove (32) opened on the inner wall of the protective cylinder (30). The protective cylinder (30) and the retaining ring (21) form a labyrinth-type sealing structure. The secondary protection component includes a bearing (40) that is interference-fitted on the outer surface of the brake drum (10) and a rubber sealing ring (41) that is fixedly installed on the inner wall of the retaining ring (21). The outer ring of the bearing (40) and the inner wall of the rubber sealing ring (41) are both provided with matching wedge-shaped grooves (42).

2. The waterproof structure for a brake according to claim 1, characterized in that: The inclination angle of the inclined circular groove (32) is 15°-25°.

3. The waterproof structure for a brake according to claim 1, characterized in that: The bearing (40) is a waterproof deep groove ball bearing.

4. The waterproof structure for a brake according to claim 1, characterized in that: The assembly assembly includes a through hole on the upper surface of the brake base plate (20), a positioning plate (50) rotatably connected to the inner wall of the through hole, three stepped holes arranged in a circumferential array on the upper end of the brake drum (10), an assembly bolt (51) set on the inner wall of the stepped hole, and a threaded hole on the upper end of the positioning plate (50) that is adapted to the assembly bolt (51), wherein the nut end of the assembly bolt (51) is located in the stepped hole.

5. A waterproof structure for a brake according to claim 4, characterized in that: The upper end of the positioning plate (50) is fixedly equipped with five screws (60) connected to the vehicle wheel hub in a circular array, and the upper end of the brake drum (10) is provided with a through hole for the screws (60) to pass through.

6. The waterproof structure for a brake according to claim 1, characterized in that: The retaining ring (21) and the brake base plate (20) are fixed by laser welding.

7. A waterproof brake structure according to claim 1, characterized in that: The included angle of the wedge-shaped groove (42) is 60°±5°.

8. The waterproof structure for a brake according to claim 1, characterized in that: The dustproof rubber ring (31) has a Shore hardness of 65-75HA, and the gap between the dustproof rubber ring (31) and the inner wall of the protective cylinder (30) is 0.5-1mm.

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