Volumetric displacement selector for hydraulic motor with smooth selection

摘要

Selector cylinder for a hydraulic motor having at least two active operating cylinder capacities and including at least two main ducts (124, 126).; The selector comprises three channels (110A, 110B, 110C) which, via distribution ducts of the motor, are used to establish selective communication between the main ducts and the cylinders of this engine. During passage of the selector between its first and second stable positions, there exists at least one direction of movement, an intermediate phase maintained for a period of time, during which all three ports communicate and the at least one section passages between the first and second ports and between the second and third ports of the switch is restricted.