Pressure sensor mounting method, tire and wheel having pressure sensor, and tire pressure detection device
First Claim
1. A tire pressure detection system comprising:
- a tire pressure detection device, mounted inside a tire of a vehicle, for detecting air pressure inside the tire; and
a reader having a coil antenna having an opening surface directed to the tire, and mounted in a highest portion of a wheel housing of the vehicle,wherein the tire pressure detection device comprises;
a pressure sensor for measuring the air pressure, using a displacement portion to be displaced according to the air pressure; and
a circuit board having a response circuit mounted on a board surface thereof, the response circuit for sending, through interaction with a supply electromagnetic field applied from the reader, data measured by the pressure sensor to the reader,wherein;
the pressure sensor is mounted on the circuit board such that a displacement direction of the displacement portion is set parallel to the board surface,the circuit board is attached on a tread portion of the tire or a rim portion of a wheel on which the tire is mounted, such that a displacement direction of the displacement portion is set parallel to a rotational axis of the tire, andthe response circuit has a coil all of which is formed as a wiring pattern on the board surface, and is electromagnetically coupled with the coil antenna to transmit the measured data.
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Accused Products
Abstract
The accuracy of a measurement value obtained by a tire pressure detection device is lowered by a centrifugal force and an inertial force during travel. A pressure sensor (30) displaces a diaphragm (20) in its vertical direction (32) according to the pressure. The pressure sensor (30) is arranged in a tire (2) with the vertical direction (32) directed to a direction parallel to a rotation axis (34) instead of the tire circumferential direction or radial direction. The pressure sensor (30) is mounted onto a substrate with the vertical direction (32) of its diaphragm (20) directed in parallel to the substrate surface and the substrate is bonded to a tread portion of the tire (2) and a wheel rim portion while adjusting the vertical direction (32) of the diaphragm (20) with the direction of the rotation axis (34).
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Citations
1 Claim
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1. A tire pressure detection system comprising:
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a tire pressure detection device, mounted inside a tire of a vehicle, for detecting air pressure inside the tire; and a reader having a coil antenna having an opening surface directed to the tire, and mounted in a highest portion of a wheel housing of the vehicle, wherein the tire pressure detection device comprises; a pressure sensor for measuring the air pressure, using a displacement portion to be displaced according to the air pressure; and a circuit board having a response circuit mounted on a board surface thereof, the response circuit for sending, through interaction with a supply electromagnetic field applied from the reader, data measured by the pressure sensor to the reader, wherein; the pressure sensor is mounted on the circuit board such that a displacement direction of the displacement portion is set parallel to the board surface, the circuit board is attached on a tread portion of the tire or a rim portion of a wheel on which the tire is mounted, such that a displacement direction of the displacement portion is set parallel to a rotational axis of the tire, and the response circuit has a coil all of which is formed as a wiring pattern on the board surface, and is electromagnetically coupled with the coil antenna to transmit the measured data.
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Specification