Air pressure sensing device for tire

Abstract

Abstract PURPOSE:To enlarge change of magnetic flux without using centrifugal force and facilitate return to the initial state of rotary magnet by rotating the rotary magnet on the basis of differential pressure between a sealed pressure chamber and a tire, changing the relative position with a pair of stationary magnets, stopping the rotary magnet, and sensing the direction of the pole at the time. CONSTITUTION:A shaft 139 is moved to the left in the attached illustration while the tire pressure is normal, and a magnetic body 165 is in the attached state by No.1 magnet 157. A magnetism amplifying means 161 confronts the S-pole of a magnet 159, and a sensing means senses this S-pole. When the tire pressure sinks to cause the differential pressure from a pressure chamber 163 to exceed the force of No.1 magnet 157 to attract the magnetic body 165, the two members separate from each other, and the differential pressure from a displacing means 135 moves it to the right. Now another magnetic body 167 is attracted by the magnet 159, and the magnetism amplifying means 161 confronts the N-pole of the No.1 magnet 157, and sensing means senses it and issues information about drop of the air pressure. Thus the width of change in the magnetic flux can be enlarged without resorting to centrifugal force.

Inventors

• 👤 Kazuo Masaki
• 👤 正木　和雄
• 👤 Yasuhiro Harada
• 👤 泰宏 原田
• 👤 Takeshi Umemoto
• 👤 武志 梅本
• 👤 Hiroshi Tokuda
• 👤 徳田　寛

Bibliographic Details