| 摘要 |
PROBLEM TO BE SOLVED: To directly measure internal pressure of a tire to find internal pressure abnormality related to a trouble of the tire in an early stage, and to evade a battery for detection of the internal pressure from being consumed in the early stage. SOLUTION: This tire internal pressure sensor 1 is constituted of a magnetic circuit element 4 including a permanent magnet provided in a tire inner space 3, a magnetic connection yoke and foamed rubber, and a magnetic sensor 14 for detecting a leaked magnetic field from the element 4, and a magnetic connection and disconnection part is provided in the element 4 to be connected and disconnected by action of the foamed rubber of which the volume is varied depending on increase and decrease of the tire internal pressure. COPYRIGHT: (C)2004,JPO
|
