Pressure sensor mounting method, tire and wheel having pressure sensor, and tire pressure detection device

• US 8,176,776 B2
• Filed: 01/24/2007
• Issued: 05/15/2012
• Est. Priority Date: 01/30/2006
• Status: Active Grant

• Current Assignee: Semiconductor Components Industries LLC (ON Semiconductor Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Suzuki, Hirohisa, Akama, Eiji, Hasegawa, Kazuo
• Primary Examiner(s): Caputa, Lisa
• Assistant Examiner(s): Jenkins, Jermaine
• Application Number:
  US12/223,250
• Publication Number:
  US 20100147063A1
• Time in Patent Office: 1,938 Days
• Field of Search: None
• US Class Current: 73/146.5
• CPC Class Codes: B60C 23/0408 transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver

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).

Claims

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, 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.