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

A device for transmitting and evaluating measurement signals of tire pressure in 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;

• two signal transmitter coils arranged at the respective rim walls so as to be adjacent to each other;
• first conductor means for electrically connecting a pressure sensor with said signal transmitter coils;
• 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 common first repeater coil arranged on the hub opposite to said two signal transmitting coils;
• a second repeater 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, each of said signal transmitter coil and said first repeater coil having an axis extending parallel with respect to the hub axis, and an end surface which is aligned with an opposite end surface of another of said signal transmitter coil and said first repeater coil, said two transmitter coils being magnetically coupled with said common first repeater coil.