JPH0342067U - - Google Patents

Description

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of this invention, with Figure 1 being an enlarged cross-sectional view of the main parts, and Figure 2 being an enlarged cross-sectional view of the main parts.
The figure is a sectional view showing the entire structure, and FIG. 3 is a sectional view showing the main parts of a conventional fuel injection device. 11... Nozzle holder, 11a... Spring storage hole, 13... First nozzle spring, 14... Second nozzle spring, 16... Fuel injection nozzle, 26... Piezoelectric element, 30... Lead wire, 32...Supporting member (
connection protrusion), 33...connection tube, 34...connector terminal, 38...insertion hole.

Claims (1)

[Scope of utility model registration request] a nozzle holder having a spring storage hole formed therein that extends from one end surface toward the other end; a nozzle spring stored in the spring storage hole of the nozzle holder;
The needle valve is provided at one end of the nozzle holder so as to face the opening of the spring storage hole, and the needle valve is lifted from the valve seat against the biasing force of the nozzle spring by the pumped fuel. , a fuel injection nozzle that injects fuel from an injection hole, and a piezoelectric element that is disposed on the bottom side of the spring storage hole and is pressed by the nozzle spring in a direction opposite to the direction in which the needle valve is biased. In the fuel injection device, a connecting protrusion is provided on the outer surface of the nozzle holder, one end of which opens into the inner surface of a spring housing hole facing the end surface of the piezoelectric element facing away from the nozzle spring, and the other end of the nozzle holder. An insertion hole is formed whose end opens on the outer surface of the connection protrusion, and one end of a flexible connecting cylinder that shields the insertion hole is press-fitted into the outer periphery of the connection protrusion in a fluid-tight manner. One end of a rod-shaped connector terminal is press-fitted and fixed to the inner peripheral surface of the other end in a liquid-tight manner while being spaced apart from the connection protrusion in the longitudinal direction of the connecting tube, and a lead wire is fixed to the one end of the connector terminal. A fuel injection device characterized in that one end of the lead wire is connected to the piezoelectric element, and the other end of the lead wire is connected to the piezoelectric element through a support tube and an insertion hole.