Patent ID: 8365705

Claim:
A fuel injection valve being adapted to be installed to an internal combustion engine and having an injection hole to inject fuel therethrough, the fuel injection valve comprising: a body that includes a high pressure passage, which is adapted to conduct high pressure fuel toward the injection hole; a flexure element that is installed to the body and is resiliently deformable upon receiving a pressure of the high pressure fuel conducted through the high pressure passage; a sensor element that is installed to the flexure element to sense a strain generated in the flexure element, wherein the sensor element converts the sensed strain into a corresponding electrical signal; a signal processing circuit that executes at least an amplifying operation, which amplifies the signal received from the sensor element; and a threaded member that is threadably fastened to the body and is configured to be rotatable relative to the flexure element, wherein: the flexure element, the sensor element and the signal processing circuit are integrally assembled together to form a fuel pressure sensing unit; and the flexure element is clamped between the threaded member and the body by a threadably fastening force of the threaded member, so that the fuel pressure sensing unit is installed to the body.