Nippondenso Co., Ltd.

Kazuyoshi Arai

Masaaki Kato

Shigeki Tojo

Yoshiya Ishii

Nobuyuki Fujitani

Hirotaka Nakatsuka

Hiroshi Imamura

Toshiaki Aoki

A fuel injection nozzle of the present invention has an accumulating chamber in a body in which high pressure fuel fed from the fuel injection pump is stored using a non-return valve. A needle valve is arranged in the body to inject the fuel in the accumulating chamber. A nozzle needle of the needle valve and a valve member are arranged coaxially and in series with each other. Those end portions of the nozzle needle and valve member which are adjacent to each other are slidably and liquid-sealingly fitted together to define a damping chamber between the valve member and the nozzle needle. Further, a damping plunger is coaxially fitted into the valve member. A passage which connects the damping chamber with the side of the fuel injection pump is coaxially formed in the damping plunger and has a reduced area.

Fuel injection nozzle

A fuel injection nozzle of this invention includes a nozzle housing which defines therein a fuel sump chamber, stepped cylinder bore and fuel passage connected at one end to the sump chamber and at the other end to a smaller diameter bore section of a stepped bore. A stepped plunger is fitted into the stepped cylinder bore to define a pump chamber communicating with the fuel passage and a main fuel chamber into which the main fuel is supplied from a fuel injection pump. An auxiliary fuel is supplied from a feed pump through the fuel passage into the sump chamber and pump chamber. A nozzle needle is located within the nozzle housing and is responsive to a fuel pressure within the sump chamber to cause it to be lifted to permit an injection hole to be opened. The nozzle needle is urged under a predetermined force of a pressure spring in a direction in which the injection hole is blocked. The urging force of the pressure spring is set to be greater than the pressure of the auxiliary fuel supplied from the feed pump and smaller than the pressure of the main fuel supplied from the fuel injection pump. The main fuel chamber, when the plunger is moved a predetermined distance responsive to the fuel pressure within the main fuel chamber, is permitted to be connected to the fuel passage.

A device for locking a cam shaft of a fuel injection pump for an internal combustion engine including a coupling block connected to a projecting portion of the cam shaft rotatably supported by a pump body. The cam shaft locking device includes a locking pin threadably engaged in a threaded opening formed in one of a fixed member on the pump body and the coupling block, and a locking plate formed with an opening for fitting the locking pin therein secured to the other of the fixed member and the coupling block, whereby the cam shaft can be locked in an optimum rotational position.

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Toyota, Japan

Kazuyoshi Arai