Patent ID: 7441562
Filing Date: 2008-10-28
Classification: B60T,F16K,Y10T

Abstract:
1. An electromagnetic valve comprising: a coil that forms a magnetic field when energized; a tubular sleeve which is disposed at an inner peripheral side of the coil and whose interior has a space; a stopper having an end side that is joined to the sleeve and closes an end of the sleeve; and an armature that is disposed slidably in the space in the sleeve, wherein the stopper is formed of a magnetic material, and forms a portion of a magnetic circuit, a deformable portion that deforms in accordance with a pressure in the space in the sleeve is formed in the stopper, the deformable portion is provided with a pressure sensor that measures an amount of deformation of the deformable portion, and the pressure sensor is made of semiconductor material and is a strain gage based pressure sensor, a specific resistance of the pressure sensor varies in accordance with stress, and the stopper is made of a material that has substantially the same linear expansion coefficient as the semiconductor material.