IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0613444
(2003-07-03)
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발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
34 |
초록
▼
A vehicle brake system includes a master cylinder having a housing defining a bore therein. A boost piston and a primary piston are slidably disposed in the bore. The master cylinder has a boost chamber defined at least in part by the boost piston and the housing. The system further includes a sourc
A vehicle brake system includes a master cylinder having a housing defining a bore therein. A boost piston and a primary piston are slidably disposed in the bore. The master cylinder has a boost chamber defined at least in part by the boost piston and the housing. The system further includes a source of pressurized fluid and a boost valve operable to supply fluid from the source of pressurized fluid to the boost chamber for advancing the boost piston and the primary piston in the master cylinder. According to one aspect of the invention, the boost valve is housed in the boost piston. According to another aspect of the invention, the brake system includes a switchable travel rate feature. According to yet another aspect of the invention, the master cylinder includes a jump in feature. Additional features of the invention are also described herein.
대표청구항
▼
What is claimed is: 1. A vehicle brake system comprising: a master cylinder having a housing defining a bore, said master cylinder further including a boost piston and a primary piston slidably disposed in said bore, said master cylinder having a boost chamber defined at least in part by said boost
What is claimed is: 1. A vehicle brake system comprising: a master cylinder having a housing defining a bore, said master cylinder further including a boost piston and a primary piston slidably disposed in said bore, said master cylinder having a boost chamber defined at least in part by said boost piston and said housing, said master cylinder having a primary chamber defined at least in part by said primary piston; a source of pressurized fluid; and a boost valve operable to supply fluid from said source of pressurized fluid to said boost chamber for advancing said boost piston and said primary piston in said master cylinder; wherein said system includes a switchable travel rate feature such that said primary piston travels at a greater rate than said boost piston during normal boosted braking when said boost valve supplies fluid from said source of pressurized fluid to said boost chamber. 2. The brake system of claim 1, wherein said boost valve is housed in said boost piston. 3. The brake system of claim 1, wherein said source of pressurized fluid provides a generally high pressure of fluid and said system further includes a pressure regulator valve for providing a limiting controlled pressure level from said source of pressurized fluid to said boost valve, wherein said pressure regulator valve is in fluid communication with said source of pressurized fluid and said boost chamber. 4. The brake system of claim 1 including a jump-in feature for providing a greater boost gain in the beginning of a braking operation, and wherein said system further includes an input mechanism including: a housing defining an input bore; an input piston slidably disposed in said input and adapted to be engageable with a brake pedal mechanism; a sleeve disposed in said input bore, said sleeve having a sleeve bore formed therein; a second piston disposed in said input bore between said input piston and said sleeve, said second piston including a passageway formed therein, said second piston having an end slidably disposed in said sleeve bore; and a spring biasing said second piston away from said sleeve. 5. The brake system of claim 1, wherein said master cylinder is operable to supply brake actuating pressure to first and second brake circuits, wherein said first brake circuit includes a conduit connecting said primary chamber to a first wheel brake, and wherein said second brake circuit includes a conduit connecting said boost chamber to a second wheel brake. 6. The brake system of claim 5 including a fluid separator valve connected between said first and second brake circuits. 7. The brake system of claim 5 including a plurality of valves for controlling an ABS function to at least one of said wheel brakes. 8. The brake system of claim 1, wherein upon a loss of pressure in said boost chamber, said master cylinder is adapted to provide manual push through operation such that said boost piston operatively connects with said primary piston such that said boost piston and said primary piston will travel at the same rate. 9. The brake system of claim 1, wherein said boost piston and said primary piston define different effective hydraulic areas such that said effective hydraulic area of said boost piston is greater than said primary piston. 10. The brake system of claim 9, wherein said master cylinder includes an intermediate chamber generally defined at least in part by said boost piston and said primary piston. 11. The brake system of claim 10, further including a reservoir in selective communication with said intermediate chamber via a valve, wherein operation of said valve selectively permits of prevents fluid from flowing between said intermediate chamber and said reservoir. 12. The brake system of claim 11, wherein said valve is pilot operated valve responsive to pressure differential between the fluid from said reservoir and said boost chamber. 13. The brake system of claim 3, wherein said regulator valve includes: a housing defining a regulator bore; a plunger slidably disposed in said regulator bore, wherein said plunger generally defines first and second chambers, said first chamber in communication with a high pressure chamber of said boost valve, said second chamber is in fluid communication with said boost chamber; a valve seat formed in said housing of said regulator valve; a valve member selectively engaged with said valve seat; and a pin extending from said plunger and operable to lift said valve member from said valve seat during movement of said plunger. 14. The brake system of claim 13, wherein said regulator valve further includes a spring biasing said plunger to reduce the volume and increase the pressure of the fluid within said first chamber. 15. The brake system of claim 4, wherein said input mechanism is housed in said boost piston. 16. A vehicle brake system comprising: a master cylinder having a housing defining a bore, said master cylinder further including a boost piston and a primary piston slidably disposed in said bore, said master cylinder having a boost chamber defined at least in part by said boost piston and said housing, said master cylinder having a primary chamber defined at least in part by said primary piston; a source of pressurized fluid providing a generally high pressure of fluid; a boost valve operable to supply fluid from said source of pressurized fluid to said boost chamber for advancing said boost piston and said primary piston in said master cylinder; and a pressure regulator valve for providing a limiting controlled pressure level from said source of pressurized fluid to said boost valve, wherein said pressure regulator valve is in fluid communication with said source of pressurized fluid and said boost chamber. 17. The brake system of claim 16, wherein said boost valve is housed in said boost piston. 18. A vehicle brake system comprising: a master cylinder having a housing defining a bore, said master cylinder further including a boost piston and a primary piston slidably disposed in said bore, said master cylinder having a boost chamber defined at least in part by said boost piston and said housing, said master cylinder having a primary chamber defined at least in part by said primary piston; a source of pressurized fluid; and a boost valve operable to supply fluid from said source of pressurized fluid to said boost chamber for advancing said boost piston and said primary piston in said master cylinder; an input mechanism for providing a greater boost gain in the beginning of a braking operation, said input mechanism including: a housing defining an input bore; an input piston slidably disposed in said input bore and adapted to be engageable with a brake pedal mechanism; a sleeve disposed in said input bore, said sleeve having a sleeve bore formed therein; a second piston disposed in said input bore between said input piston and said sleeve, said second piston including a passageway formed therein, said second piston having an end slidably disposed in said sleeve bore; and a spring biasing said second piston away from said sleeve. 19. The brake system of claim 16, wherein said boost valve is housed in said boost piston.
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