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Tire pressure sensor for motor vehicles

  • US 5,035,137 A
  • Filed: 01/10/1990
  • Issued: 07/30/1991
  • Est. Priority Date: 07/16/1987
  • Status: Expired due to Fees
First Claim
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1. A tire pressure sensor to be secured at a circumference of a rim of a wheel of a motor vehicle for monitoring air pressure in the wheel tire, said tire pressure sensor comprising a reference pressure chamber including a base and a bushing insulator arranged in said base:

  • an electrically conducting diaphragm for separating said reference pressure chamber from a tire interior;

    a first contact pin extending in a center of said base through said bushing insulator; and

    a contact body extending through said bushing insulator adjacent to said first contact pin, said diaphragm having a first contact zone for engaging said first contact pin, upon being in response to air pressure in the wheel tire reaching a first predetermined value, to close a first resonant circuit, and a second contact zone for engaging said contact boby, upon being bent in response to air pressure in the wheel tire reaching a second predetermined value greater than the first predetermined value, to close a second resonant circuit.

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