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Device for monitoring the pressure of a vehicle tire

  • US 5,400,649 A
  • Filed: 07/02/1993
  • Issued: 03/28/1995
  • Est. Priority Date: 08/29/1990
  • Status: Expired due to Term
First Claim
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1. An apparatus for monitoring a pressure of a vehicle tire comprisinga vehicle wheel;

  • a tire mounted to the vehicle wheel;

    a pressure inlet port connected to the interior of the tire;

    a valve device having an inlet port, a control inlet port, and an outlet port, wherein the inlet port of the valve device is connected to the pressure inlet port, wherein the control inlet port is subjectable to a pressure present in the tire, and wherein the valve device is actuatable by the pressure present in the tire;

    an actuator connected to the outlet port of the valve device and actuatable by the pressure present in the tire, wherein the actuator is subjected to a restoring force, wherein the valve device transmits the pressure present in the tire to the outlet port and to the actuator in a first switching position of the valve device in a situation where the tire pressure is at a predetermined or above the predetermined tire pressure and wherein the restoring force opposes the pressure present in the tire and transmitted to the actuator, wherein the valve device separates the pressure inlet port from the actuator in a second switching position of the valve device in a situation where the pressure present in the tire has dropped to below the predetermined tire pressure and wherein the valve device connects the actuator through a discharge port to the atmosphere in the second switching position of the valve device, and wherein the actuator generates a regulating distance (S) corresponding to a transition position value from the first switching position of the valve device to the second switching position of the valve device, and wherein the actuator thereby indicates a drop of the pressure present in the tire.

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