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Tire pressure maintenance system

  • US 5,846,354 A
  • Filed: 11/21/1995
  • Issued: 12/08/1998
  • Est. Priority Date: 02/01/1994
  • Status: Expired due to Fees
First Claim
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1. A tire pressure maintenance system, comprising:

  • a pressure sensor for measuring gas pressure in said tire and providing a pressure signal representative of said gas pressure;

    a control device responsive to said pressure signal and to provide a control signal; and

    a gas transfer mechanism including a micromechanical pump responsive to said control signal for transferring gas into said tire from a location external to said tire, said micromechanical pump including,a pumping chamber;

    an air transfer chamber;

    a flexible membrane separating said air pumping chamber from said air transfer chamber;

    a first valve between said air transfer chamber and a location external to said tire;

    a second valve between said air transfer chamber and a location internal to said tire; and

    a third valve between said pumping chamber and a location internal to said tire.

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