Patent attributes
A fuel injection valve is provided that includes an electromagnetic actuator (A1) that moves a valve body (10) in an inwardly-opening direction, and a magnetostrictive actuator (A2) that, by passing current therethrough, elongates a movable part assembly (43) extending from the valve body (10) to a movable core (24) of the electromagnetic actuator (A1), wherein the magnetostrictive actuator (A2) is formed from a solid magnetostrictive element (15) provided between the valve body (10) and the movable core (24) of the electromagnetic actuator (A1) so as to couple the valve body (10) and the movable core (24), a preload spring (13) provided between the valve body (10) and the movable core (24) so as to apply a compressive preload in the axial direction of the valve body (10) to the magnetostrictive element (15), and a second coil (42) mounted on a valve housing (H) housing the valve body (10), the movable core (24), the magnetostrictive element (15), and the preload spring (13), the second coil (42) elongating the magnetostrictive element (15) against the preload by the passage of current. By combining in this way the electromagnetic actuator and the magnetostrictive actuator equipped with the solid magnetostrictive element, a fuel injection valve of an inwardly-opening type that has good responsiveness and is capable of operating at low power consumption can be provided.
