DETECTOR OF THE INFLATION PRESSURE OF MOTOR VEHICLE TYRES

摘要

A detector (13) of the inflation pressure of motor vehicle tyres comprises a manometric switch activated by the tyre pressure in order to monitor said pressure. The manometric switch comprises a reference pressure chamber (21) isolated from the tyre by an electrically conductive diaphragm (29) a contact pin (30) which is touched by the middle area of the diaphragm when the tyre pressure is sufficient, closing an electric circuit. In order to trigger an alarm signal when the reference pressure chamber (21) presents a leak, the presence of leaks in the reference chamber (21) is determined in that the contact pin (30) and the middle area of the diaphragm (29) are separated by an air gap when the pressure on both sides of the diaphragm (29) is equal.