Vacuum-operated brake power booster

US4641568A · kind A · utility

Assignee

• Alfred Teves GmbH · DE

Inventors

• Peter Boehm · Frankfurt am Main, DE
• Peter Volz · Darmstadt, DE
• Gilbert Bischoff · Hattersheim, DE
• Sigmund Booten · Oberursel, DE
• Klaus Engert · Wiesbaden, DE
• Albin Loew · Karben, DE

Key dates

• Filing date: Mar 12, 1985
• Grant date: Feb 10, 1987
• Expiry date: Mar 12, 2005

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T13/569
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A vacuum-operated brake power booster is provided having a movable wall which is sealed off relative to the vacuum housing and a control valve body which is slidable jointly with the movable wall. A hollow cylinder-shaped expanded plastic ring is arranged in the annular clearance between the neck portion of the pedal side housing shell and the collar of the diaphragm, which collar sealingly surrounds the control valve body. The expanded plastic ring effects the air flow during brake operation such that the air flow, enters the annular clearance through the duct extending in a radial direction within the control valve body and is suitably deflected and cushioned so that no noises arise at this point. In the same manner and simultaneously, vibrations, especially those of the neck portion of the housing shell of the vacuum housing, are suppressed, since the expanded plastic ring adheres to the inside wall of the housing shell.