To provide a pressure sensor capable of eliminating influences due to excessive pressure by a simple structure, and facilitating the work of changing/adjusting an upper limit pressure.
A pressure sensor 1 includes: a body portion 2 storing a fluid to be measured, and detecting the pressure of the fluid; and a fluid introducing portion 3 having an introducing channel 3h introducing the fluid into the body portion 2. The body portion 2 includes: a fixing portion 21 having an introducing hole 21h continuing to one end of the introducing channel 3h; a moving portion 22 having pressure sensitive portions 22d and 22s formed on a surface opposing to a surface in which the introducing hole 21h of the fixing portion 21 is formed; an expansion/contraction coupling portion 23 coupling the fixing portion 21 and the moving portion 22, and capable of expanding/contracting according to the pressure of the fluid stored in the body portion 2; a rod-shaped body 25 inserted in the introducing channel 3h, and having a cover portion 25c capable of blocking the introducing port of the fluid introducing portion 3 at one end; and a supporting portion 26 coupling and supporting the other end of the rod-shaped body 25 in the moving portion 22.
Toshifumi Onuki
Akihiko Eguchi
Kazuhiko Naito
Next Patent: ROTATION ANGLE DETECTING DEVICE