Importance

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Abstract

An injector unit consists of a housing (1), of a controllable piston pump (5) and of an injection nozzle (4) adjoining the latter and having a nozzle chamber (25), the housing (1) possessing a fuel supply chamber (23) fed from outside and a return orifice (24) leading outward, the piston pump (5) possessing a pump piston bush (6) which is guided on a pin (20) fixed relative to the housing and which has control orifices (17), and the pin (20) containing a first longitudinal bore (39) leading from the interior (18) of the pump piston bush (6) to the injection nozzle (4). In order to improve sealing and through flow, the pump piston bush (6) is surrounded by a sealing sleeve (50), the pin (20) has a second longitudinal bore (57) and the sealing space (53) is flow-connected to the return orifice via a second transverse bore (58) and a third longitudinal bore (59) in the pin (20).

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First Claim