Device for transmission and evaluation of measurement signals for the tire pressure of motor vehicles

  • US 5,033,295 A
  • Filed: 02/04/1989
  • Issued: 07/23/1991
  • Est. Priority Date: 05/04/1988
  • Status: Expired due to Fees
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First Claim
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1. A device for transmitting and evaluating measurement signals of tire pressure in single and twin wheels of motor vehicles with each wheel including a hub having a hub axis, a rim supported on the hub for joint rotation therewith, and a tubeless tire mounted on the rim, said device comprising a sensor arranged in a rim wall;

  • a signal transmitter coil arranged at the rim;

    first conductor means for electrically connecting a pressure sensor with said signal transmitter coil;

    high-frequency resonant circuit signal evaluating means located in vicinity of an axle of a motor vehicle, fixed stationary with respect to the motor vehicle, and including a signal pick-up coil;

    a first repeater coil arranged on the hub in an area of said signal transmitting coil;

    a second repeated coil;

    second conductor means for electrically connecting said first and second repeater coils, said second repeater coil being formed as a toroidal coil having an axis that coincides with the hub axis, said signal pick-up coil being arranged in a magnetic field of said second repeater coil; and

    means for enabling mounting of the rim in a predetermined angular position on the hub in which said signal transmitter coil and said first repeater coil are located opposite each other.

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