Vacuum braking-force booster

US4825750A · kind A · utility

Assignee

• Fag Kugelfischer Georg Shäfer AG · DE

Inventors

• Eckhart Rudiger · Ebern, DE
• Hermann Bauer · Wolnzach, DE

Key dates

• Filing date: Jul 2, 1985
• Grant date: May 2, 1989
• Expiry date: Jul 2, 2005

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T13/57
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A vacuum breaking-force booster has a sequential control valve without a response path. First and second pressure chambers are separated by a diaphragm with a diaphragm disk in it and the diaphragm disk is connected with a shaft that supports a radially inward valve seat which presses against a spring biased sealing disk. Communication between the first and second chambers is past the inner valve seat. A shiftable sleeve extends through the lid of the first of the chambers and includes a collar which engages the inside of the lid for determining the maximum extend the sleeve can move out of the lid. A pressure piston extends through the sleeve. A bridge connects the sleeve with the pressure piston for moving together. An elastomeric bellows attaches the sealing disk to the sleeves and the pressure piston; the outer valve seat is defined on the sleeve for engaging the sealing disk. A spring normally urges the sealing disk toward both of the valve seats. A second flow path in the booster extends from the atmosphere through the bridge past the outer valve seat and into the first chamber. In an alternate embodiment, the outer valve seat is directly on the sleeve and the inner valve sea…