Hydraulic brake apparatus for a vehicle
US6478385B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2001 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Jun 29, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/161
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A vehicle hydraulic brake apparatus includes a brake member, a master cylinder generating a brake hydraulic pressure by increasing the pressure of brake fluid in a reservoir, a master piston moved forward in response to operation of the brake member, a closed chamber defined behind the master piston, a power piston disposed behind the master piston, and a power chamber defined behind the power piston. An auxiliary hydraulic pressure source generates power hydraulic pressure and a pressure regulating device connects the auxiliary hydraulic pressure source with the reservoir. The power hydraulic pressure is regulated to a predetermined hydraulic pressure and is fed to the power chamber. A normally-open type valve connects the closed chamber and the power chamber, and is closable upon operation of the brake member. The closed chamber is connected to the reservoir via the normally-open type valve, the power chamber and the pressure regulating device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.