Tire pressure monitoring device

G - Physics – 01 – M

Patent

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Details

G01M 13/02 (2006.01) B60C 23/00 (2006.01) B60C 23/04 (2006.01)

Patent

CA 2429593

A low tire pressure monitoring device that is affixed to a tire valve stem (22) and methods of using the same. The monitoring device comprises a housing (26) having a counter-pressure chamber (21), a main pressure chamber (94), and a flexible membrane (36) that separates the two chambers. The monitoring device is calibrated by trapping the tire initial air pressure in the counter pressure chamber (21). The air pressure within the main pressure chamber (94) is equivalent to the air pressure within the tire. Over the course of time, the air pressure within the tire and concomitantly the air pressure within the main pressure chamber decreases. When the pressure in the counter pressure chamber is greater than the pressure within the main pressure chamber (94), the flexible membrane (36) touches and completes an electrical circuit (27) and a warning signal is emitted.

L'invention concerne un dispositif de surveillance d'une pression insuffisante de pneu, qui est fixé à une tige de valve du pneu (22), ainsi que des procédés d'utilisation associés. Le dispositif de surveillance comporte un logement (26) ayant une chambre à contre-pression (21), une chambre à pression principale (94) et une membrane souple (36) séparant les deux chambres. Le dispositif de surveillance est étalonné par piégeage de la pression d'air initiale du pneu dans la chambre à contre-pression (21). La pression de l'air à l'intérieur de la chambre à pression principale (94) est équivalente à la pression de l'air à l'intérieur du pneu. Au fil du temps, la pression de l'air à l'intérieur du pneu et celle à l'intérieur de la chambre à pression principale diminuent en même temps. Lorsque la pression dans la chambre à contre-pression (21) est supérieure à celle dans la chambre à pression principale (94), la membrane souple (36) touche et complète un circuit électrique (27), ce qui déclenche un signal d'alarme.

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