Fuel injection pump for internal combustion engines, particularly for diesel engines

Abstract

Cylindrical sleeve having a top portion of enlarged diameter which includes a control bore and which is clamped by an annular screw against a shoulder of a reception bore in the pump housing. An annular screw has, in a widened bore portion at least partially surrounding the top portion of the cylindrical sleeve, a pressure shoulder which is recessed relative to the end face of the annular screw presented to the suction chamber and which transmits the clamping force to the cylindrical sleeve. In a further refinement, the annular screw is provided with an annular extension which surrounds the cylindrical sleeve at a distance therefrom in the region of the control bore and whose inner wall forms a protection against impingement of the jet of fuel emerging from the control bore upon the termination of fuel delivery. A widened portion of the bore for receiving the valve member of the pressure valve is disposed in a second portion of the delivery bore which branches laterally, preferably at right angles, from a first portion of the delivery bore which extends coaxially of the longitudinal axis of the pump cylinder, and a screw plug is screwed into an extension of the said first portion. After the screw plug has been removed, the measuring sensor of a pre-stroke measuring device can be mounted onto the pump piston through the first portion of the delivery bore, and thus the dimension of the pre-stroke can be determined.

Dependencies are inferred from the claim text.