Fuel injection valve with cylinder internal pressure sensor
View Patent ↗Within a resin mold portion of a fuel injection valve, an amplifying member having a substrate is provided. An engagement hole that penetrates in an axial direction is formed in another end part of the amplifying member, and an engagement pin, which is formed on a bobbin of a housing, is inserted through the engagement hole. A second connector of a second signal transmitting member, which constitutes part of a signal transmitting unit, is inserted from below into a connecting hole formed in the substrate. In addition, when the resin mold portion is molded, the amplifying member is retained in a state with the engagement pin and the second connector being inserted, respectively, into the engagement hole and the connecting hole.
1. A fuel injection valve equipped with a cylinder internal pressure sensor, the fuel injection valve being configured to directly inject fuel into a combustion chamber of an internal combustion engine, the sensor being provided at an end of the fuel injection valve, the sensor being configured to detect a cylinder internal pressure in an interior of the combustion chamber, the fuel injection valve comprising:
a housing;
a signal transmitting member disposed in an interior of the housing and configured to transmit a detection signal based on the cylinder internal pressure; and
a drive unit configured to drive a valve element by energizing a coil assembly including a coil;
wherein the signal transmitting member includes an amplifying unit configured to amplify and output the detection signal, the amplifying unit being constituted as a circuit body in which a substrate is molded by a resin material, power source terminals being connected to the substrate, the power source terminals being configured to supply electrical power to the sensor; and
the fuel injection valve further comprises an assembly unit configured to assemble the circuit body and the coil assembly,
wherein the amplifying unit and the coil assembly are covered with a resin mold portion.
2. The fuel injection valve equipped with the cylinder internal pressure sensor according to claim 1 , wherein the assembly unit comprises:
a recess disposed on one of the circuit body and the coil assembly; and
a projection disposed on another one of the circuit body and the coil assembly other than the one on which the recess is disposed.
3. The fuel injection valve equipped with the cylinder internal pressure sensor according to claim 2 , wherein the recess is formed in a sealing member, the sealing member being configured to cover the substrate in the circuit body, and the projection is disposed on a bobbin of the coil assembly.