To be desirable in emergency has the fluid pressure actuator and the said actuator of haidorosutateitsukumodo which functioning is done the maneuvering system

摘要

PURPOSE: To reduce the required number of hydraulic circuits and to prevent an actuator from its upsizing, by combining an electrically hydraulic air servo control device with a local pumping group. ;CONSTITUTION: A hydraulic actuator 1 contains a double-acting jack 10, hydraulic supply-discharge tubes 35, 34 of the jack, a housing part 16 to be connected hydraulically to the tubes 35, 34, a mobile switching member 17 arranged in the housing part 16, and a control member 51 which controls a mobile switching member 17 and makes it move between a neutral position and a working position. The housing part 16 is connected by variable speed pumping groups 60, 61 via an auxiliary circuit. The mobile switching member 17 implements the second operation in which the jack communicates with the auxiliary circuit. As a result, the jack, the pump groups, and the auxiliary circuit constitute a hydraulic transmission mechanism.;COPYRIGHT: (C)1993,JPO