Device and method for supervising the air pressure of a vehicle tyre.

摘要

A device for monitoring the air pressure in a pneumatic tyre carried on the rim of a vehicle wheel having a sensor element mounted on the ring of the rim and able to be subjected to and deformed by the tyre pressure, which has a permanent magnet as its transducer in whose sphere of rotation is a measured value sensor, fixed stationarily on the vehicle and connected to an analysing circuit, should function reliably and be of uncomplicated design. To this end the sensor element is designed as a bellows (36) and fitted roughly axially parallel to the direction of movement and at the same time connected to the permanent magnet (40) sliding on a parallel axis on the outside of the tyre as a function of the tyre pressure, the magnet remaining close to the measured value sensor (5) at normal tyre pressure (P) with a greater distance between them at reduced tyre pressure. In addition the bellows (36) should project from a surface-mounted housing on the ring of the rim (21) into the tyre air chamber (25) and be connected via an axial rod or the like to a bistable rocker which can move an axially parallel-mounted permanent magnet.