Load sensing proportioner with proportioner delay
US4111495A · kind A · utility
Inventor
Key dates
| Filing date | Jun 29, 1977 |
| Grant date | Sep 5, 1978 |
| Priority date | — |
| Expiry date | Jun 29, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T8/306
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A brake actuating pressure proportioning valve is positioned in a vehicle rear brake circuit. The valve is sensitive to vehicle load to change the rear brake pressure point at which proportioning begins. The valve is also sensitive to front brake circuit pressure. If a significant decrease of front brake circuit pressure occurs, a delay piston is moved to follow the proportioner piston to a predetermined extent. In this condition the delay piston keeps the proportioner from operating in a proportioning mode, permitting full rear brake circuit pressure to be delivered without proportioning action. The delay piston is spring loaded to permit a significant pressure delay in proportioning action before it is moved toward its original position with increasing rear brake circuit pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.