Vane hydraulic motor

摘要

A multi-vane hydraulic motor (26) for accessory drive in which the vanes (46) of a hydraulically balanced rotor (42) are primarily urged into operative engagement with a surrounding cam by forces of the hydraulic fluid in undervane passage produced by an associated hydraulic pump to eliminate requirement for biasing springs and spring attachment of prior art motor. A high pressure chamber (78) provided between the motor housing and a pressure plate mounted therein is hydraulically connected to the vane chambers (72) of the rotor of the motor for the hydraulic drive thereof. An end cap (66) closing the motor housing has the hydraulic input (22, 28) and output (24, 108) lines operatively connected thereto.