Hydraulic stepping servo-drive with step selector - has selector slide with collars in sleeve with multiple connections

摘要

The hydraulic step servo drive has a valve with a cylinder connected hydraulically with outlet openings of a step selector and a moving element. The element has a mechanical feedback connection with the step selector slider. The slider has rings whose position within sleeve determines the spacing of inlet holes. The adjusting system of the moving part (3) of the hydraulic cylinder is designed as a three line operating selector slide. The system has sleeve with three openings (48, 49, 50) in which moves a two collar spool. This spool is connected to slider (18) of the step selector (5). The distance between collars (46, 47) corresponds to full stroke of moving part (3) of the hydraulic cylinder (1). The two external sleeve openings (48, 50) are connected to liquid source (32) and servo actuator drain.