Fuel injection system for internal combustion engines

Claim 1

A fuel injection system for an internal combustion engine, comprising: a substantially cylindrical injector body having a delivery cylinder and an injection cylinder connected to the delivery cylinder, a delivery plunger which is slidably fitted in the delivery cylinder and which defines a delivery pump chamber in the delivery cylinder, an injection plunger which is slidably fitted in the injection cylinder and which defines an injection pump chamber in the injection cylinder, said injection plunger being axially displaced by the fuel fed into the injection pump chamber, through a stroke in proportion to the amount of the fed fuel, a first stop on one end of the injection cylinder adjacent to the delivery cylinder for limiting the axial movement of the injection plunger in one direction, a second stop on the other end of the injection cylinder for limiting the axial movement of the injection plunger in the opposite direction, fuel passage means for feeding the fuel into the injection pump chamber, and nozzle means for injecting the fuel delivered by the injection pump chamber, said injection plunger being moved under the pressure which occurs in the delivery pump chamber due to the displacement of the delivery plunger to deliver the fuel in the injection pump chamber into the nozzle means, said two stops comprising axially extending projections which are adapted to control the axial displacement of the injection plunger.