Brake master cylinder with dual check valve compensation through secondary piston
US6276137A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2000 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Jan 14, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T11/232
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A master cylinder provides separate flow paths through its secondary piston to provide greater fluid flow capacity from the reservoir to both the primary and secondary pressure chambers in response to the removal of brake fluid from the brake lines fed by the primary and secondary pressure chambers by a pump providing brake pressure for activation of one or more wheel brakes independently of the master cylinder. The secondary piston is provided with an axial fluid flow passage having check valves at each axial end permitting fluid flow only out of the axial fluid flow passage into the primary and secondary pressure chambers. A cross flow passage intersects the axial fluid flow passage between the primary and secondary check valves to communicate the axial fluid flow passage with the intermediate chamber and thus with the reservoir through the secondary compensation opening. The additional flow capacity to both pressure chambers provides improved reaction time for a traction control system at any wheel brake. Since the changes need only be made to the secondary piston, through standard parts and operations, costs are minimized. An additional advantage is the ability to change the pr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.