Combined power valve and flow divider
US4154326A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 1977 |
| Grant date | May 15, 1979 |
| Priority date | — |
| Expiry date | Sep 12, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/16
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A closed-center brake system and brake valve are disclosed. A closed-center variable displacement pressure compensated pump delivers fluid pressure to a valve inlet which carries a normally closed check valve. When a valve operating rod is partially withdrawn from the valve, the check valve opens to admit fluid to a valve chamber; fluid pressure and flow are directed from the chamber to ports leading to a vehicle left-hand brake and a vehicle right-hand brake. Should fluid pressure be lost in upstream portions of the system, further pulling action on the valve rod will collapse the chamber and manually deliver pressurized fluid to the brakes. Another brake valve outlet port, located just downstream of the inlet check valve, provides for delivery of pressure compensated fluid back to the pump to cause the pump to operate with desired characteristics. Yet another brake valve outlet port delivers fluid to another system element, such as a hydraulically operated vehicle differential, so as to lock left-hand and right-hand vehicle drive trains together to prevent relative rotation when either the left-hand brake, the right-hand brake, or both brakes are operated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.