B - Operations – Transporting – 60 – C
Patent
B - Operations, Transporting
60
C
B60C 23/04 (2006.01)
Patent
CA 2124724
VEHICLE WHEEL INCORPORATING TIRES AIR PRESSURE SENSOR ABSTRACT OF THE DISCLOSURE A tire air pressure sensor (18) is mounted on a vehicle wheel (10) and includes an inertial mass (40) which is urged radially outwardly by centrifugal force resulting from rotation of the wheel (10). The tire air pressure is applied to the inertial mass (40) in opposition to the centrifugal force. When the rotational speed of the wheel (10) is sufficient that the centrifugal force overcomes the applied air pressure, the inertial mass (40) moves radially outwardly and opens a switch (33). The speed at which the switch (33) opens is a predetermined function of the tire pressure. In another embodiment (130), a second sensor (154,160) is provided to sense when the tire pressure is below a minimum value. A spring (140) urges an inertial mass (138) inwardly in opposition to the centrifugal force, and the tire pressure is applied to a bellows (154) having an end (160) which moves radially outwardly in proportion to the applied pressure. The bellows (154) opens a first switch (166) when the pressure is higher than the minimum value, and the inertial mass (138) moves radially outwardly away from the end (160) of the bellows (154) to open a second switch (168) when the wheel speed exceeds the value corresponding to the tire pressure.
Olney Ross D.
Reeds John W.
Hughes Aircraft Company
Sim & Mcburney
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