Copy valve for an anti-lock brake system
US5470137A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1994 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Aug 16, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T8/4275
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A copy valve for an anti-lock brake system. The copy valve has a housing enclosing four chambers. A first and fourth chamber of the enclosed four chambers receives pressurized fluid directly from the first and second cylinders of a dual master brake cylinder. The third chamber receives the pressure of the controlled brake actuator while the second chamber is connectable to the uncontrolled brake actuator. In one embodiment, a single piston is enclosed in the housing and the first and second chambers are disposed at the opposite ends of the piston. The piston has an enlarged collar intermediate the two ends which is received in an annular recess provided in the housing. The third chamber is formed between a first face of the piston's enlarged collar and the annular recesses while the fourth chamber is formed between the opposite face of the piston's enlarged collar and the adjacent face of the housing. A throughbore is provided through the piston connecting the first and second chambers. A valve disposed in the throughbore is open when the piston is in the second chamber and closed when the piston is displaced from the second chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.