Brake boosting system
US6183049A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1999 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Jan 7, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/686
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In a brake boosting system the present invention, as it is decided that brake assist is necessary, a pump 53 is driven, and a solenoid valve 72 is switched to its communication position, and a solenoid shut-off valve 75 is opened. Then, the pump 53 sucks brake fluid from a reservoir 9 through the solenoid valve 72 and sends out the brake fluid to the pressure intensifying chamber 21 through the solenoid shut-off valve 75. At this point, an output shaft 11 has already advanced and a radial hole 38 is positioned ahead of a seventh cup sealing member 31 so that the pressure intensifying chamber 21 and the reaction chamber 33 are shut off from the reservoir 9 so as to be in the sealed state. Therefore, pump discharge pressure is supplied to the pressure intensifying chamber 21 and the reaction chamber 33 so that the pressure in these chambers is intensified. Since the intensified pressure acts on the primary piston 12, the master cylinder pressure is intensified to a value greater than that of normal braking. As mentioned above, by intensifying the master cylinder pressure when necessary, large braking force can be obtained with a simple structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.