Ram air turbine actuator

Patent metadata

Field	Value
Publication number	US-9399522-B2
Application number	US-201414185405-A
Country	US
Kind code	B2
Filing date	Feb 20, 2014
Priority date	Feb 20, 2014
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

A component for use in a ram air turbine actuator includes a lock bolt extending along a centerline with the lock bolt being axially movable between a stowed position and a deployed position and a plurality of rollers that are radially outward from the centerline and guided by the lock bolt. The component also includes a slider radially between at least a portion of the lock bolt and a piston rod with the slider being axially movable between a stop position and the deployed position and up-lock wedges supported by the piston rod. The actuator becomes locked in the stowed position when the lock bolt and slider move axially within the piston rod and a cylinder to position the rollers to push the up-lock wedges radially outward into an aperture and prevent the lock bolt, slider, and cylinder from axial movement.

First claim

I claim:

1. An actuator for a ram air turbine system comprising:
a piston rod that is cylindrical in shape and centered about a centerline;
a plurality of up-lock wedges supported by the piston rod and able to move radially;
a lock bolt that extends along the centerline radially within the piston rod, the lock bolt being axially movable within the piston rod between a stowed position and a deployed position;
a plurality of rollers that are radially outward from the centerline and guided by the lock bolt;
a slider radially between at least a portion of the lock bolt that is adjacent to the rollers and the piston rod, the slider being axially movable between a stop position and the deployed position, the stop position being axially between the deployed position and the stowed position;
a cylinder radially outward from the piston rod, the cylinder being axially movable between the stowed position and a deployed position,
wherein the actuator becomes locked in the stowed position when lock bolt, slider, and cylinder move axially to position the rollers radially inward from the up-lock wedges so that the rollers push the up-lock wedges radially outward into an aperture adjacent to one end of the cylinder and prevent the lock bolt, slider, and cylinder from axial movement.

2. The actuator of claim 1 , further comprising:
a first annular seal located between the slider and the piston rod; and
a second annular seal located between the lock bolt and the slider.

3. The actuator of claim 2 , wherein pressure applied to the first annular seal causes the slider and lock bolt to move axially until the slider is in the stop position.

4. The actuator of claim 2 , wherein pressure applied to the second annular seal causes the lock bolt to move until the actuator becomes locked in the stowed position.

5. The actuator of claim 2 , further comprising:
a stop located on the piston rod at the stop position near the up-lock wedges, the stop preventing the slider from movement towards the up-lock wedges but allowing the lock bolt to continue movement towards the up-lock wedges.

6. The actuator of claim 5 , wherein pressure applied to the first annular seal and the second annular seal causes the slider and lock bolt to move until the slider contacts the stop and then causes only the lock bolt to move until the rollers are within the up-lock wedges.

7. The actuator in claim 1 , wherein an inner surface of the up-lock wedges is tapered.

8. The actuator of claim 1 , wherein the actuator is not locked in a stowed position when the rollers are not radially inward from the up-lock wedges.

9. A component for use in an actuator in a ram air turbine comprising:
a piston rod;
a cylinder;
a lock bolt extending along a centerline, the lock bolt being axially movable along the centerline between a stowed position and a deployed position;
a plurality of rollers that are radially outward from the centerline and guided by the lock bolt;
a slider radially between at least a portion of the lock bolt and the piston rod, the slider being axially movable between a stop position and the deployed position, the stop position being axially between the deployed position and the stowed position; and
up-lock wedges supported by the piston rod,
wherein the lock bolt and slider are axially movable within the piston rod and the actuator becomes locked in the stowed position when the lock bolt and slider move axially within the piston rod and the cylinder to position the rollers to push the up-lock wedges radially outward into an aperture adjacent to one end of the cylinder and prevent the lock bolt, slider, and cylinder from axial movement.

10. The component of claim 9 , further comprising:
a first annular seal located radially outward from the slider; and
a second annular seal located between the lock bolt and the slider.

11. The component of claim 10 , wherein pressure applied to the first annular seal causes the slider and lock bolt to move axially until the slider is in the stop position.

12. The component of claim 10 , wherein pressure applied to the second annular seal causes the lock bolt to move until the actuator becomes locked in the stowed position.

13. The component of claim 10 , further comprising:
a stop located at the stop position near the up-lock wedges, the stop preventing the slider from movement towards the up-lock wedges but allowing the lock bolt to continue movement towards the up-lock wedges.

14. The component of claim 13 , wherein pressure applied to the first annular seal and the second annular seal causes the slider and lock bolt to move until the slider contacts the stop and then causes only the lock bolt to move until the rollers are within the up-lock wedges.

15. The component in claim 9 , wherein an inner surface of the up-lock wedges is tapered.

Assignees

• Hamilton Sundstrand
• Hamilton Sundstrand Corp

Inventors

• Bannon David G

Classifications

• B64D41/007 Primary

  Ram air turbines · CPC title

• F05D2220/34

  in ram-air turbines ("RATS") · CPC title

• F15B15/261

  using positive interengagement, e.g. balls and grooves, for locking in the end positions · CPC title