FUEL INJECTION VALVE AND FUEL INJECTION DEVICE

摘要

A fuel injection valve has an injector body (4z) having formed in it high-pressure paths (6az, 6bz, 6cz) that allow high-pressure fuel to flow to a nozzle and receiving a piezo actuator (2z)(opening/closing mechanism), a back pressure control mechanism (3z)(opening/closing mechanism), etc. for opening and closing the nozzle; a stem (51z)(deformable body) mounted on the body (4z) and elastically deforming when subjected to the pressure of the high-pressure fuel; and a strain gauge (52z)(sensor element) mounted on the stem (51z) and converting the magnitude of deformation of the stem (51z) into an electric signal and outputting it as a detected pressure value. In the structure above, the strain gauge (52z) is mounted on the stem (51z) formed as a separate body from the body (4z).