Pressure holding valve and vehicle braking device using the same
US6732519B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 8, 2002 |
| Grant date | May 11, 2004 |
| Priority date | — |
| Expiry date | Jun 1, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T15/36
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pressure-responsive type pressure holding valve is proposed which serves to hold the hydraulic pressure in a circuit connected to a spool valve. A piston valve biased by a spring is mounted in a housing formed with a valve chamber, a small-diameter bore and a large-diameter bore. The outer periphery of the small-diameter portion of the piston valve is sealed by a seal member. A first port opened and closed by a valve head at the tip of the piston valve is connected to a circuit that needs pressure holding, a second port to a circuit in which minute leak can occur, and a third port to a source of hydraulic pressure for opening the valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.