DOUBLE ENDED COUPLER FOR SERVO ACTUATOR

An actuator assembly (12) of a fuel injector (10) has an elongated body provided with an internal bore (22) extending from an opening (24) to a bottom face (26) and wherein a servo actuator member (46) is arranged to extend and retract in order to cooperate with a valve member. The actuator assembly (12) further comprises a hydraulic lash adjuster (HLA) filled with fluid, the HLA being provided with a first reaction chamber (90) wherein pressure rises when the actuator member (46) extends and pressure drops when the actuator member (46) retracts and, a second reaction chamber (92) wherein pressure drops when the actuator member (46) extends and pressure rises when the actuator member (46) retracts so that, the HLA is adapted to resist both the extensions and the contractions of the servo actuator member (46).