Sealed brake chamber

Abstract

The utility model discloses a sealed type brake chamber, including shell, diaphragm, push rod and return spring, said diaphragm is provided in the shell close to the bottom position, the front end of shell is provided with shell front end cover, the central position of shell front end cover is provided with through-hole, the push rod passes through the through-hole of shell front end cover, and the return spring passes through the shell front end cover. The tail end of the push rod is connected to the membrane, a sealing sleeve shell is arranged at the position of the through hole of the front end cover of the shell, a sealing scraping sleeve is arranged at the front end of the sealing sleeve shell, and a threaded sleeve is arranged at the rear end of the sealing sleeve shell and installed at the position of the through hole of the front end cover of the shell through a threaded sleeve knob. The push rod is reasonable in structural design and convenient to use, and stains attached to the push rod can be scraped off when the push rod does linear telescopic motion by arranging the sealing scraping ring and the sealing sleeve shell, so that the stains are prevented from entering the shell.

Description

Technical Field

[0001] The utility model relates to the field of brake chambers, in particular to a sealed brake chamber. Background Art

[0002] A brake chamber, also known as a slave cylinder, is used to convert the pressure of compressed air into mechanical force to rotate the brake camshaft, thereby realizing the braking action.

[0003] In the existing brake chamber, there is a gap between the push rod and the through hole of the front end cover of the brake chamber through which the push rod passes. During the repeated linear telescopic movement of the push rod, the push rod is prone to long-term contact with the external environment, resulting in a large amount of stains easily adhering to the surface of the push rod and being easily brought into the brake chamber. Over time, a large amount of stains are likely to accumulate in the brake chamber, which is not conducive to the stable use of the brake chamber. Summary of the Utility Model

[0004] To solve the above problems, the utility model provides a sealed brake chamber, which includes a housing, a diaphragm, a push rod and a return spring. The diaphragm is arranged near the bottom inside the housing. A front end cover of the housing is provided at the front end of the housing. A through hole is provided at the center of the front end cover of the housing. A connecting fork is provided at the front end of the push rod. The push rod passes through the through hole of the front end cover of the housing. The end of the push rod is connected to the diaphragm. A sealing sleeve housing is provided at the position of the through hole of the front end cover of the housing. A sealing scraping sleeve is provided at the front end of the sealing sleeve housing. A threaded sleeve is provided at the rear end of the sealing sleeve housing and is installed at the through hole of the front end cover of the housing by screwing the threaded sleeve. A sealing scraping ring is embedded in the sealing sleeve housing. A serrated surface is provided on the inner wall of the inner circle of the sealing scraping ring. The return spring is sleeved on the push rod. The two ends of the return spring are respectively fixed on the front end cover of the housing and the diaphragm. An air inlet is provided at the rear end of the housing.

[0005] Preferably, both the sealing scraping sleeve and the sealing scraping ring are made of rubber.

[0006] Preferably, a filter screen is provided inside the air inlet.

[0007] Preferably, a sealing gasket is embedded at the outer periphery of the diaphragm.

[0008] The beneficial effects of the utility model are as follows: The structure of the utility model is reasonably designed and convenient to use. By setting the sealing scraping ring and the sealing sleeve housing, the stains attached to the push rod can be scraped off when the push rod performs linear telescopic movement, thereby preventing the stains from entering the housing. Brief Description of the Drawings

[0009] The utility model will be described by way of examples with reference to the accompanying drawings, where:

[0010] Figure 1 is the overall structural schematic diagram of the present utility model;

[0011] Figure 2 is the partial structural schematic diagram of the present utility model;

[0012] In the figure: 1. housing; 2. front end cover of the housing; 3. diaphragm; 4. sealing gasket; 5. air inlet; 6. filter net; 7. return spring; 8. push rod; 9. sealing sleeve housing; 10. threaded sleeve; 11. sealing scraping sleeve; 12. sealing scraping ring. Specific embodiments

[0013] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

[0014] Any feature of this specification, unless specifically described, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically described, each feature is only an example in a series of equivalent or similar features.

[0015] Such as Figure 1 、 2 shown, a sealed brake chamber includes a housing 1, a diaphragm 3, a push rod 8 and a return spring 7. The diaphragm 3 is arranged at a position close to the bottom inside the housing 1. A front end cover 2 of the housing is arranged at the front end of the housing 1. A through hole is arranged at the center position of the front end cover 2 of the housing. A connecting fork is arranged at the front end of the push rod 8. The push rod 8 passes through the through hole of the front end cover 2 of the housing. The end of the push rod 8 is connected and arranged on the diaphragm 3. A sealing sleeve housing 9 is arranged at the position of the through hole of the front end cover of the housing. A sealing scraping sleeve 11 is arranged at the front end of the sealing sleeve housing 9. A threaded sleeve 10 is arranged at the rear end of the sealing sleeve housing 9 and is installed at the through hole of the front end cover 2 of the housing by screwing through the threaded sleeve 10. A sealing scraping ring 12 is embedded in the sealing sleeve housing 9. A serrated surface is arranged on the inner peripheral wall of the sealing scraping ring 12. The return spring 7 is sleeved on the push rod 8. Both ends of the return spring 7 are respectively fixed on the front end cover 2 of the housing and the diaphragm 3. An air inlet 5 is arranged at the rear end of the housing 1.

[0016] Both the sealing scraping sleeve 11 and the sealing scraping ring 12 are made of rubber material.

[0017] A filter net 6 is arranged inside the air inlet 5.

[0018] A sealing gasket 4 is embedded at the outer peripheral part of the diaphragm 3.

[0019] During use, the sealing sleeve housing 9 is installed on the front end cover 2 of the housing by screwing through the threaded sleeve 10. The push rod 8 sequentially passes through the sealing sleeve housing 9 and the front end cover 2 of the housing and extends into the housing 1.

[0020] When the compressed air enters the housing 1 from the air inlet 5 and squeezes the diaphragm 3, the diaphragm 3 will move forward in the housing 1, thereby driving the push rod 8 to move forward in a straight line. On the contrary, after the compressed air stops entering the air inlet 5, the return spring 7 will drive the diaphragm 3 to reset, and then drive the push rod 8 to move backward in a straight line. As a result, the push rod 8 repeatedly performs linear telescopic motion. During this process, the sealing scraping sleeve 11 will scrape the surface of the push rod 8, so that the attached stains on the surface of the push rod 8 are scraped off. At the same time, the sealing scraping ring 12 will perform secondary scraping on the push rod 8 when the push rod 8 moves, thereby realizing the sealing of the gap between the push rod 8 and the front end cover 2 of the housing, and preventing stains from entering the housing 1.

[0021] The setting of the sealing gasket 4 can seal the gap between the diaphragm 3 and the housing 1 when the diaphragm 3 moves.

[0022] The setting of the filter screen 6 can filter out stains such as dust carried in the compressed air.

[0023] The beneficial effects of the present utility model are as follows: The structure of the present utility model is reasonably designed and convenient to use. By setting the sealing scraping ring and the sealing sleeve housing, the stains attached to the push rod can be scraped off when the push rod performs linear telescopic motion, thereby preventing stains from entering the housing.

[0024] The present utility model is not limited to the foregoing specific embodiments. The present utility model extends to any new feature or any new combination disclosed in this specification, as well as any new method or process step or any new combination disclosed.

Claims

1. A sealed brake chamber, comprising a housing (1), a diaphragm (3), a push rod (8) and a return spring (7). The diaphragm (3) is arranged at a position close to the bottom inside the housing (1). A front end cover (2) of the housing (1) is arranged at the front end of the housing (1). A through hole is arranged at the central position of the front end cover (2) of the housing. A connecting fork is arranged at the front end of the push rod (8). The push rod (8) passes through the through hole of the front end cover (2) of the housing. The end of the push rod (8) is connected and arranged on the diaphragm (3), characterized in that, A sealing sleeve housing (9) is provided at the through-hole position of the front end cover of the housing. A sealing scraping sleeve (11) is provided at the front end of the sealing sleeve housing (9). A threaded sleeve (10) is provided at the rear end of the sealing sleeve housing (9) and is installed at the through-hole of the front end cover (2) of the housing by screwing the threaded sleeve (10). A sealing scraping ring (12) is embedded in the sealing sleeve housing (9). A serrated surface is provided on the inner circumferential wall of the sealing scraping ring (12). The return spring (7) is sleeved on the push rod (8). The two ends of the return spring (7) are respectively fixed on the front end cover (2) of the housing and the diaphragm (3). An air inlet (5) is provided at the rear end of the housing (1).

2. The sealed brake chamber according to claim 1, wherein Both the sealing scraping sleeve (11) and the sealing scraping ring (12) are made of rubber material.

3. A sealed brake chamber according to claim 1, characterized in that, A filter screen (6) is provided in the air inlet (5).

4. A sealed brake chamber according to claim 1, wherein A sealing gasket (4) is embedded at the outer periphery of the diaphragm (3).

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