Hydraulic brake system
US4340257A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 10, 1980 |
| Grant date | Jul 20, 1982 |
| Priority date | — |
| Expiry date | Nov 10, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S188/01
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Hydraulic brake systems are known including a master cylinder, wheel brake cylinder and antiskid control apparatus in which a fluid flow from a fluid source to the pressure chamber of the master cylinder is controlled by a valve device. The antiskid control apparatus activate valves to modulate the pressure in the associated wheel cylinders in the event of an imminent locked condition of a wheel. The known valve devices are complicated and do not permit determining the operability of the brake system before reaching a change-over point. To obviate these disadvantages, the valve device of the present invention feeds pressure from an auxiliary circuit in case of a corresponding decline in pressure from the master cylinder to the wheel cylinders. In the inactive state of the valve device, a pressure fluid connection is opened between a chamber defined by a booster piston and a fluid reservoir and this connection is closed upon actuation of the valve device, i.e. pressure is built up in a chamber locates at the end of the booster piston which has a closed connection to the valve device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.