Brake control valve arrangement
US4421212A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1981 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | Nov 19, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/141
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An arrangement for controlling the pressure of a hydraulic braking fluid supplied to a brake actuating cylinder includes an elongated hollow valve member mounted for axial movement in a bore of a housing. A compression spring acts on the valve member in one axial direction, and a control piston acts on the valve member in the opposite axial direction. Control pressure is admitted into an actuating compartment to act on the control piston and via the same on the valve member. The valve member forms a first valve arrangement with the control piston and a second valve arrangement with a part which is rigid with the housing. The first and second valve arrangement respectively controlled the communication of a slave unit with a low-pressure supply reservoir and with an actuating pressure source. The compression spring urges the valve member toward a position in which the first valve arrangement is open and the second valve arrangement is closed. An auxiliary spring acts on the compression spring via an auxiliary piston, a tappet and a transmission member, to augment the force of the compression spring. The control pressure is supplied upon brake actuation to the auxiliary piston to exer…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.