Service and emergency brake system having a master cylinder with a travel simulator gas-filled spring
US5544948A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1994 |
| Grant date | Aug 13, 1996 |
| Priority date | — |
| Expiry date | Nov 14, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T17/16
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A travel simulator having a progressive pedal characteristic to be in operation in a power-actuated service brake. The hydraulic brake system has a valve assembly for the switching of the brake system into operation as either a service brake or as an emergency brake. The master cylinder has a pressure fluid reservoir, two pressure chambers, and an intermediate piston as well. The intermediate piston is supported on a travel simulator spring. When the service brake is in operation, pressure fluid can be diverted from the second pressure chamber into the reservoir, and the intermediate piston is moved against the resistance of the spring. When the emergency brake is in operation, both pressure chambers communicate with one another so that the intermediate piston is pressure balanced. When the pedal is actuated, pressure fluid is expelled from the first pressure chamber. The intermediate piston is not subject to any motion during an emergency brake operation. The brake system is for use in road vehicles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.