Fluid pressure boosting device and brake system employing the same
US6467267B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 15, 2001 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Jun 15, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/161
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In a brake fluid pressure boosting device 1 of the present invention, by operation, an input shaft 4 is moves forward to rotate a lever 27 to actuate a control valve 8 so that the control valve 8 produce working fluid pressure corresponding to the input. The working fluid pressure is introduced into the power chamber 6. By this working fluid pressure, the primary piston 37 is actuated to develop master cylinder pressure. On the other hand, the fluid pressure of the power chamber 6 is introduced into the first annular groove 25 of the valve spool 10. By the difference between pressure receiving areas of the first annular groove 25, the valve spool 10 is subjected to rightward force. The position of the pivot of the lever 27 is fixed and the valve spool 10 is controlled in such a manner that the force applied to the valve spool 10 and the spring force of the spool return spring 32 balances with the input, thereby exhibiting the function as a stroke simulator. Because of this function as a stroke simulator, the stroke characteristic on the input side can be changed without affecting the output side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.