Sensor for a pneumatic tire

Details Sensor for a pneumatic tire Sensor for a pneumatic tire

1998-12-15

2000-08-22

Oen, William

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

340442, B60C 2302

Patent

active

061054232

ABSTRACT:
A sensor is provided for detecting rotations of a pneumatic tire on a vehicle comprising two spaced apart mounting points for attachment to the radially inner surface of the tire tread region, a contact member between the mounting points for contacting the inner surface of the tread radius of the tire between the two mounting points and signal producing means comprising a piezo-electric device which is adapted to produce a signal when the contact member is moved radially of the tire relative to the two mounting points wherein damping means are provided so that a signal is generated when the movement occurs rapidly but slow movement generates no signal so that on rotation of the tire on a vehicle a signal is produced each time the tread region to which the sensor is attached becomes changed in radius at the contact patch of the tire but when the tread radius changes slowly when there is a pressure change in the tire and the movement is slow no signal is produced.

REFERENCES:
patent: 4067235 (1978-01-01), Markland et al.
patent: 5721528 (1998-02-01), Boesch et al.
patent: 5877679 (1999-03-01), Prottery

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