BRAKE CYLINDER DUST COVER AND WATERPROOF BRAKE CYLINDER USING SUCH DUST COVER

Abstract

The invention discloses a brake cylinder dust cover and a waterproof brake cylinder using such dust cover. The brake cylinder comprises a brake cylinder body and a front cover. A waterproof dust cover assembly is arranged on the front cover. The waterproof dust cover assembly comprises a dust cover fixedly connected to the front cover, and a filter felt support and a filter felt pad which are arranged in the dust cover. The filter felt support is connected with the dust cover, and the filter felt pad is fixed on the filter felt support. An outwards extending skirt is arranged at the edge of the dust cover in the axial direction thereof.

Claims

1. A brake cylinder dust cover, the brake cylinder dust cover (4) being fixedly connected to a front cover (2) of the brake cylinder, characterized in that an outwards extending skirt (7) is arranged at the edge of the brake cylinder dust cover (4) in the axial direction thereof.

2. The brake cylinder dust cover according to claim 1, characterized in that the skirt (7) takes the shape of a bell mouth as a whole.

3. The brake cylinder dust cover according to claim 1, characterized in that the skirt (7) and the brake cylinder dust cover (4) are formed into an integrated structure.

4. A waterproof brake cylinder using the brake cylinder, comprising a brake cylinder body (1) and a front cover (2), characterized in that a waterproof dust cover assembly (3) is arranged on the front cover (2); the waterproof dust cover assembly (3) comprises a brake cylinder dust cover (4) fixedly connected to the front cover (2), and a filter felt support (5) and a filter felt pad (6) which are arranged in the brake cylinder dust cover (4); the filter felt support (5) is connected with the brake cylinder dust cover (4), and the filter felt pad (6) is fixed on the filter felt support (5); and an outwards extending skirt (7) is arranged at the edge of the brake cylinder dust cover (4) in the axial direction thereof.

5. The waterproof brake cylinder according to claim 4, characterized in that an outwards extending boss (8) is arranged at a vent of the brake cylinder dust cover (4) in the axial direction thereof.

6. The waterproof brake cylinder according to claim 4, characterized in that a waterproof ring seat (11) for mounting a filter cover (10) of front cover is arranged in the front cover (2); the waterproof ring seat (11) is sleeved on a piston rod (12) of the brake cylinder; a double-lip waterproof ring (13) is arranged on the waterproof ring seat (11) and between the waterproof ring seat (11) and the piston rod (12); and an O seal ring (14) is arranged on the waterproof ring seat (11) and between the waterproof ring seat (11) and the front cover (2).

7. The waterproof brake cylinder according to claim 6, characterized in that a ring slot (9) is arranged at the outer end face of the waterproof ring seat (11), and the O seal ring (14) is assembled in the ring slot (9).

8. The brake cylinder dust cover according to claim 2, characterized in that the skirt (7) and the brake cylinder dust cover (4) are formed into an integrated structure.

9. The waterproof brake cylinder according to claim 4, wherein the skirt (7) takes the shape of a bell mouth as a whole.

10. The waterproof brake cylinder according to claim 4, wherein the skirt (7) and the brake cylinder dust cover (4) are formed into an integrated structure.

11. The waterproof brake cylinder according to claim 5, characterized in that a waterproof ring seat (11) for mounting a filter cover (10) of front cover is arranged in the front cover (2); the waterproof ring seat (11) is sleeved on a piston rod (12) of the brake cylinder; a double- lip waterproof ring (13) is arranged on the waterproof ring seat (11) and between the waterproof ring seat (11) and the piston rod (12); and an O seal ring (14) is arranged on the waterproof ring seat (11) and between the waterproof ring seat (11) and the front cover (2).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1 is a diagram illustrating a conventional front cover assembly for a brake cylinder;

[0014] FIG. 2 is a structural diagram of the invention;

[0015] FIG. 3 is an enlarged view of the waterproof dust cover assembly in FIG. 2;

[0016] FIG. 4 is a waterproof diagram of the front cover end in the invention; and

[0017] FIG. 5 is a structural diagram of a waterproof ring seat of the invention.

[0018] Marks in the figures: 1brake cylinder body; 2front cover; 3waterproof dust cover assembly; 4brake cylinder dust cover; 5filter felt support; 6filter felt pad; 7skirt; 8boss; 9ring slot; 10filter cover of front cover; 11waterproof ring seat; 12piston rod; 13doublelip waterproof ring; 14O seal ring B; and 15release spring.

DESCRIPTION OF THE PREFERRED EMBODIMENT

[0019] The invention will be described in detail in combination with accompanied drawings.

[0020] In order to make the purpose, technical solution and advantages of the invention more clear, the invention will be described in detail in combination with accompanied drawings and embodiments. It should be understood that various embodiments described herein are only used to explain the invention rather than defining the invention.

[0021] As shown in FIG. 2 and FIG. 3, a waterproof brake cylinder comprises a brake cylinder body 1 and a front cover 2. A waterproof dust cover assembly 3 is arranged on the front cover 2. The waterproof dust cover assembly 3 comprises a brake cylinder dust cover 4 fixedly connected to the front cover 2, and a filter felt support 5 and a filter felt pad 6 which are arranged in the brake cylinder dust cover 4. The filter felt support 5 is connected with the brake cylinder dust cover 4, and the filter felt pad 6 is fixed on the filter felt support 5. An outwards extending skirt 7 is arranged at the edge of the brake cylinder dust cover 4 in the axial direction thereof. The skirt 7 and the brake cylinder dust cover 4 are formed into an integrated structure. The skirt 7 takes the shape of a bell mouth as a whole. An outwards extending boss 8 is arranged at a vent of the brake cylinder dust cover 4 in the axial direction thereof, thus further preventing rain water from entering the dust cover.

[0022] As shown in FIG. 3, when rain water flows down along the brake cylinder dust cover, rain water will fall down along the skirt directly because of the water retaining effect of the skirt on the brake cylinder dust cover so as to isolate the gas passage from the flowing path of rain water, which plays a waterproof role. When the brake cylinder is released, negative pressure is formed above the filter felt pad of a filter assembly. However, as rain water cannot reach the place C of the brake cylinder dust cover due to the block from the skirt, rain water will not be sucked into the cylinder. Even if a small part of the rain water flows to the place C, rain water will be stopped by the boss at the place C again, which ensures that rain water can not enter the brake cylinder dust cover.

[0023] As shown in FIG. 4, a waterproof ring seat 11 for mounting the filter cover 10 of front cover is arranged in the front cover 2, and the waterproof ring seat 11 is sleeved on the piston rod 12 of the brake cylinder. A double-lip waterproof ring 13 is arranged on the waterproof ring seat 11 and between the waterproof ring seat 11 and the piston rod 12. The double-lip waterproof ring is made from high-hardness polyurethane, which reduces friction with the piston rod, and can prevent rain water from entering the cylinder body from the place A. An O seal ring 14 is arranged on the waterproof ring seat 11 and between the waterproof ring seat 11 and the front cover 2. As shown in FIG. 5, a ring slot 9 is arranged at the outer end surface of the waterproof ring seat 11, and the O seal ring 14 is assembled in the ring slot 9. With the acting force of a release spring 15, the O seal ring 14 deforms and plays a sealing role, which prevents rain water from entering the cylinder from the place B between the front cover and a dust ring mounting base. The filter cover of front cover is sealed through the O seal ring and the double-lip waterproof ring, which avoids direct contact with the atmosphere, reduces volatilization of 89 M lubricating grease stored in the cover, slows oxidative deterioration down and is useful for lubrication and rust protection of the piston rod.

[0024] The invention makes structural improvement for the three water leakage positions A, B and C in FIG. 1. The invention provides a seal structure to play a waterproof role, thus effectively preventing pollution and corrosion in the brake cylinder due to rain water, which greatly reduces the service life of the brake cylinder and ensures safe driving.

[0025] The above mentioned examples are preferred examples of the invention only and not used to limit the invention. Any modification, equivalent replacement and improvement made within the range of the spirit and principle of the invention shall be incorporated in the protection scope of the invention.