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Electromechanical actuator lubrication system for ram air turbine

A technology of actuators and gas turbines, which is used in auxiliary power equipment, aircraft transmissions, aircraft power transmission, etc., and can solve problems such as leakage, pressure increase, and fluid leakage

Active Publication Date: 2013-12-25
HAMILTON SUNDSTRAND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] return pressure is typically relatively low, however in recent aircraft designs this pressure has increased significantly
Only one dynamic seal holds the oil-filled cavity, and therefore there is the possibility that fluid may leak from the cavity, which is not intended
Also, there is the possibility that since the nose is fixed relative to the cylinder, the cylinder could be misaligned relative to the nose, which would provide a leak path

Method used

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  • Electromechanical actuator lubrication system for ram air turbine
  • Electromechanical actuator lubrication system for ram air turbine
  • Electromechanical actuator lubrication system for ram air turbine

Examples

Experimental program
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Embodiment Construction

[0012] figure 1 RAT system 10 is shown secured to aircraft structure 12 by housing 14 . The housing 14 pivotably supports a strut 16 having a turbine 18 at one end. The turbine 18 includes blades 20 that impart rotational drive to, for example, a generator 22 and a hydraulic pump 30 . The actuator 24 is secured to the strut 16 at a first end 26 and to the housing at a second end 28 . Actuator 24 is shown in its deployed position.

[0013] refer to figure 2 and image 3 , the actuator 24 comprises a housing 32 having a piston rod 34 and a cylinder 36 not attached to the housing 32, the piston rod 34 and the cylinder 36 being telescopically arranged relative to each other. Deployment spring 38 is arranged between housing 32 and cylinder 36, under compression, actuator 24 is in its retracted position, as figure 2 shown. A piston rod 34 is fixed to the housing 32 and a cylinder 36 is arranged to slide on the piston rod 34 .

[0014] The piston rod 34 supports an upper lo...

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Abstract

The invention relates to an electromechanical actuator lubrication system for a ram air turbine. An actuator for a ram air turbine includes a housing that supports a piston rod arranged in a cylinder. The piston rod and the cylinder are slideably moveable relative to one another between retracted and deployed positions. A can surrounds the cylinder and is loosely fixed relative to the housing. The can is permitted to pivot relative to the housing and cylinder relative to the cylinder in a radial direction during operation. In operation, the ram air turbine is deployed by initiating a deploy sequence. The piston rod and the cylinder are extended relative to one another to the deployed position. The method includes pivoting a can that surrounds the cylinder and the piston rod.

Description

technical field [0001] The present invention relates to an electromechanical actuator lubrication system for, for example, a ram air turbine (RAT). Background technique [0002] A typical hydraulic RAT actuator includes a piston rod that is movable relative to a cylinder. In one example actuator, the piston rod is fixed to the housing. The housing includes a proboscis that is machined as part of the housing. During deployment, the cylinder slides axially relative to the nose. [0003] In the past, the nose was designed so that the high pressure oil generated during the damped movement of the actuator does not escape during deployment of the RAT. A cavity is provided between the nose and the cylinder and housing. This cavity is typically filled with return pressure oil from the aircraft. Several recent aircraft designs employ check valves in the hydraulic system upstream of the RAT to prevent loss of hydraulic oil in the event of a catastrophic accident. Thus, the actua...

Claims

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Application Information

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IPC IPC(8): B64C13/40
CPCB64D41/007
Inventor G.萨斯瑟
Owner HAMILTON SUNDSTRAND CORP
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