Tire pressure sensor for motor vehicles

US5035137A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Johannes Burkard · Nuremberg, DE
• Gerhard Hettich · Roßtal, DE
• Hans-Dieter Schmid · Nuremberg, DE

Key dates

• Filing date: Jan 10, 1990
• Grant date: Jul 30, 1991
• Expiry date: Jan 10, 2010

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L19/12
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A tire pressure sensor for monitoring pressure in the tire of a motor vehicle wheel and comprising a reference pressure chamber, two contact members extending through a bushing insulator arranged in the base of the reference pressure chamber, and an electrically conducting diaphragm that separates the reference pressure chamber from the tire interior. The diaphragm has two contact zones that engage sequentially the two contact members upon being bent in response to air pressure in the tire interior reaching, respectively, a first value and a second value greater than the first value.