Hydraulic lash adjuster

摘要

A hydraulic lash adjuster is provided for interfacing between a piezoelectric element and a control valve in a piezoelectric actuated fuel injector. The hydraulic lash adjuster includes an inner plunger having an axial passage for storing a working fluid therein, and an outer body having a socket dimensioned to receive the inner plunger. The inner plunger is movably coupled into the socket of the outer body so as to form a working chamber between a bottom outer surface of the inner plunger and a bottom surface of the socket in the outer body. The hydraulic lash adjuster further includes a feed valve assembly disposed in the passage of the inner plunger for providing the working fluid from the passage to the working chamber, thereby minimizing the volume of the working chamber.