Detector of the inflation pressure of motor vehicle tires

US4793277A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Lothar Haas
• Gerhard Hettich · Roßtal, DE
• Manfred Kamp · Nuremberg, DE
• Hans-Dieter Schmid · Nuremberg, DE
• Hans Schrumpf · Oberasbach, DE
• Berthold Walter · Oberasbach, DE

Key dates

• Filing date: Aug 6, 1987
• Grant date: Dec 27, 1988
• Expiry date: Aug 6, 2007

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60C23/0498
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A tire pressure detector for motor vehicles which is to be fastened to a wheel rim comprises a pressure switch actuated by the air pressure in the tire for monitoring the tire pressure. The pressure switch includes a reference pressure chamber with an electrically conductive switching diaphragm which closes the chamber toward the tire and which cooperates with a contact pin of the reference pressure chamber and an electric oscillating circuit connected to the latter in the detector housing. The reference pressure chamber (23) is axially clamped between a supporting ring and a spacing ring of insulating material in the metallic detector housing by a radial collar, which is formed, so that an annular gap is formed between the collar and the inner wall of the detector housing.