Multi-port solenoid valve in an antiskid brake control apparatus
US5221129A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1991 |
| Grant date | Jun 22, 1993 |
| Priority date | — |
| Expiry date | Sep 26, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T8/5037
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A discharge passage communicating a brake cylinder and a low-pressure accumulator is provided with a second orifice. Owing to a pressure differential between pressure upstream of the second orifice and pressure downstream of the orifice, a passage changeover valve is set to a first position, when brake cylinder pressure is decreased during antiskid braking control, at which the passage changeover valve cuts off the discharge side of a pump from the brake cylinder, and to a second position, when brake cylinder pressure is increased, at which the changeover valve communicates the discharge side of the pump with a flow-rate controller and communicates the discharge side of the pump with a master cylinder and the brake cylinder solely through a first orifice in the flow-rate controller. As a result, when pressure is decreased during antiskid braking control, the discharge side and the intake side of the pump are completely cut off from each other so that the burden upon the pump is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.