CN201521579U

CN201521579U - Braking master cylinder

Info

Publication number: CN201521579U
Application number: CN2009201801162U
Authority: CN
Inventors: 康伟铭
Original assignee: Wuhu Juda Auto Parts Co Ltd
Current assignee: Wuhu Juda Auto Parts Co Ltd
Priority date: 2009-10-26
Filing date: 2009-10-26
Publication date: 2010-07-07
Anticipated expiration: 2019-10-26

Abstract

The utility model discloses a braking master cylinder which comprises a cylinder body, wherein a working cavity is positioned in the cylinder body, a front piston and a rear piston are installed in the working cavity, the rear end of the rear piston protrudes out of the rear end of the cylinder body, and a stop collar, a guide bushing leather collar and a stop collar for hole are sequentially arranged between the rear piston and the rear end of the cylinder body. In the braking master cylinder of the utility model, one end of the rear piston protrudes out of the cylinder body of the braking master cylinder, therefore, when the braking master cylinder is assembled with a vacuum booster, the rear piston can be embedded into the casing of the vacuum booster, and as the braking master cylinder is closely assembled with the vacuum booster, a top rod of the vacuum booster pushes against the embedded rear piston to lead the top rod of the vacuum booster to be closely matched with the rear piston, and the working efficiency is enhanced.

Description

A kind of brake master cylinder

Technical field

The utility model relates to the car hydraulic brake field, relates in particular to a kind of brake master cylinder that is used for car hydraulic brake.

Background technique

Traditional dual line braking master cylinder, have former and later two pistons, these two pistons all are arranged in the cylinder body of brake master cylinder, the brake master cylinder of this structure, when assembling with vacuum booster, the assembling defective tightness, the push rod of vacuum booster can not cooperate effectively with the back piston of brake master cylinder, can not increase work efficiency effectively.

The model utility content

The purpose of this utility model is in order to overcome technological deficiency recited above, a kind of brake master cylinder to be provided.

In order to solve technical problem recited above, the utility model is taked following technological scheme:

The utility model provides a kind of brake master cylinder, includes cylinder body, has active chamber in the cylinder body, is mounted with secondary piston and back piston in active chamber; On cylinder body, offer the preceding filler opening that is complementary with secondary piston, preceding oil inlet hole and precompensation hole; On cylinder body, offer the back filler opening, back oil inlet hole and the post-compensation hole that are complementary with back piston; The front end of secondary piston is disposed with preceding gasket, preceding main apron and secondary piston spring seat, and the secondary piston spring seat is provided with the secondary piston spring of butt cylinder body front end; The rear end of secondary piston is provided with the spring abutment of being hit by a bullet, and the front end setting of be hit by a bullet spring abutment and back piston is equipped with back piston and extends screw; The front end of back piston is disposed with back gasket, back main apron and back piston spring seat, back piston spring seat and be hit by a bullet and be provided with the back piston spring between the spring abutment; Rear end of the cylinder block is stretched out in the rear end of back piston, is disposed with back-up ring, guide sleeve apron, guide sleeve and hole back-up ring between back piston and the rear end of the cylinder block.

Wherein, described back oil inlet hole has oil inlet passage, offers the post-compensation hole that connects active chamber on oil inlet passage.Offer auxiliary hole on cylinder body, this auxiliary hole is opened in the top of the cylinder body corresponding with the post-compensation hole, and auxiliary hole is provided with sealed steel ball.

The utility model is by stretching out a wherein end of back piston the cylinder body of brake master cylinder, make brake master cylinder when assembling with vacuum booster, this back piston can be imbedded in the housing of vacuum booster, in brake master cylinder and vacuum booster close fit, make the vacuum booster push rod withstand the back piston of imbedding, the push rod of vacuum booster is closely cooperated with back piston, increase work efficiency.

Description of drawings

Fig. 1 is the structural drawing of the utility model brake master cylinder.

Fig. 2 is the A-A sectional structure chart of Fig. 1.

Among the figure, 1. cylinder body, 2. sealed steel ball, 3. rectangular seal, 4. filler opening seal ring after, 5. preceding filler opening seal ring, 6. oil inlet hole after, 7. preceding oil inlet hole, 8. post-compensation hole, 9. precompensation hole, 10. back piston, 11. hole back-up ring, 12. guide sleeve, 13. guide sleeve apron, 14. back gasket, 15. the main apron in back, 16. back piston spring seat, 17. back piston spring, 18. back piston extends screw, the spring abutment 19. be hit by a bullet, 20. secondary apron, 21. secondary piston, 22. preceding gasket, 23. preceding main apron, 24. secondary piston spring seat, 25. secondary piston spring, 26. back-up ring, 27. inverted draw cut.

Embodiment

See also Fig. 1 and Fig. 2, as shown in the figure, brake master cylinder includes cylinder body 1, has active chamber in the cylinder body 1, is mounted with secondary piston 21 and back piston 10 in active chamber; On cylinder body 1, offer the preceding filler opening, preceding oil inlet hole 7 and the precompensation hole 9 that are complementary with secondary piston 21, filler opening seal ring 5 before on preceding filler opening, being mounted with; On cylinder body 1, offer the back filler opening, back oil inlet hole 6 and the post-compensation hole 8 that are complementary with back piston 10, on the filler opening of back, be mounted with back filler opening seal ring 4; The front end of secondary piston 21 is disposed with preceding gasket 22, preceding main apron 23 and secondary piston spring seat 24, and secondary piston spring seat 24 is provided with the secondary piston spring 25 of butt cylinder body 1 front end; The rear end of secondary piston 21 is provided with the secondary apron 20 and the spring abutment 19 of being hit by a bullet, and is provided with between the front end of be hit by a bullet spring abutment 19 and back piston 10 back piston is installed extends screw 18, and the afterbody of back piston extension screw 18 therefrom spring seat 19 passes and imbed the front end of back piston 10; The front end of back piston 10 is disposed with back gasket 14, back main apron 15 and back piston spring seat 16, back piston spring seat 16 and be hit by a bullet and be provided with back piston spring 17 between the spring abutment 19; Cylinder body 1 rear end is stretched out in the rear end of back piston 10, is disposed with back-up ring 26, guide sleeve apron 13, guide sleeve 12 and hole back-up ring 11 between back piston 10 and cylinder body 1 rear end; Offer inverted draw cut 27 in the rear end of back piston 10, push rod that can ccontaining vacuum booster; Offer auxiliary hole on cylinder body 1, this auxiliary hole is opened in the top of the cylinder body 1 corresponding with post-compensation hole 8, and auxiliary hole is provided with sealed steel ball 2; Assembling place with vacuum booster on cylinder body 1 is provided with rectangular seal 3.

Back piston of the present utility model exposes rear end of the cylinder block, when brake master cylinder and vacuum booster assembling, pass through rectangular seal, make both fitting tights, the exposed portions serve of back piston is imbedded in the housing of vacuum booster, the vacuum booster push rod withstands back piston by the inverted draw cut of back piston, makes push rod tight with cooperating of back piston.

When brake master cylinder was worked, the vacuum booster push rod promoted back piston and moves forward, and also moved forward thereby promote secondary piston, and forward and backward main apron passes through compensate opening separately, sets up high pressure, and pressure oil is exported by oil outlet; During current, back piston return, fluid flows back to lubricating cup by compensate opening.

Although the utility model has been done to describe in detail and quoted embodiment as proof, for those of ordinary skill in the art, obviously various schemes, modification and the change that can make according to above-mentioned explanation all should be included within the scope of claim.

Claims

1. a brake master cylinder includes cylinder body (1), and cylinder body has active chamber in (1), is mounted with secondary piston (21) and back piston (10) in active chamber; On cylinder body (1), offer the preceding filler opening that is complementary with secondary piston (21), preceding oil inlet hole (7) and precompensation hole (9); On cylinder body (1), offer the back filler opening that is complementary with back piston (10), back oil inlet hole (6) and post-compensation hole (8); The front end of secondary piston (21) is disposed with preceding gasket (22), preceding main apron (23) and secondary piston spring seat (24), and secondary piston spring seat (24) is provided with the secondary piston spring (25) of butt cylinder body (1) front end; The rear end of secondary piston (21) is provided with the spring abutment of being hit by a bullet (19), is provided with between the front end of spring abutment of being hit by a bullet (19) and back piston (10) back piston extension screw (18) is installed; The front end of back piston (10) is disposed with back gasket (14), back main apron (15) and back piston spring seat (16), is provided with back piston spring (17) between back piston spring seat (16) and the spring abutment of being hit by a bullet (19); It is characterized in that: cylinder body (1) rear end is stretched out in the rear end of back piston (10), is disposed with back-up ring (26), guide sleeve apron (13), guide sleeve (12) and hole back-up ring (11) between back piston (10) and cylinder body (1) rear end.

2. brake master cylinder as claimed in claim 1 is characterized in that: described back oil inlet hole (6) has oil inlet passage, offers the post-compensation hole (8) that connects active chamber on oil inlet passage.

3. brake master cylinder as claimed in claim 2 is characterized in that: offer auxiliary hole on cylinder body, this auxiliary hole is opened in the top of the cylinder body (1) corresponding with post-compensation hole (8), and auxiliary hole is provided with sealed steel ball (2).