초록 ▼

A power drive unit for operation of structure in opposite directions, such as aircraft structure and, particularly, thrust reverser structure of an aircraft engine operable between stow and deploy positions, including, a bi-directional hydraulic motor having a variably positionable wobbler for contr

A power drive unit for operation of structure in opposite directions, such as aircraft structure and, particularly, thrust reverser structure of an aircraft engine operable between stow and deploy positions, including, a bi-directional hydraulic motor having a variably positionable wobbler for controlling displacement of the motor. Control structure includes a valve for causing fluid flow through the motor in either of two directions, a control cylinder and piston connected to the wobbler for setting the motor at either minimum or maximum displacement conditions. In one embodiment, there is an intermediate displacement position. The displacement condition is established by valve structure responsive to the particular cycle of operation.

대표청구항 ▼

A power drive unit for imparting two-directional drive to a thrust reverser mechanism with different torque demands in different cycles of operation including low torque and high speed in a deploy cycle and high torque and low speed in a stow cycle comprising, a two-direction variable displacement h

A power drive unit for imparting two-directional drive to a thrust reverser mechanism with different torque demands in different cycles of operation including low torque and high speed in a deploy cycle and high torque and low speed in a stow cycle comprising, a two-direction variable displacement hydraulic motor with a displacement-varying means, a control cylinder having a piston connected to said displacement-varying means, a first circuit connected to said motor and including a valve for controlling the direction and volume of hydraulic flow to the motor and providing the same full rate of flow to said motor at the beginning of each of said cycles, and a second circuit connected to said control cylinder and including valve means operable independently of said valve for establishing the position of the piston in the cylinder at the beginning of each cycle to control the position of said displacement-varying means and have a minimal motor displacement for starting the deploy cycle and a maximum displacement for starting the stow cycle.