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公开(公告)号：US20190309817A1
公开(公告)日：2019-10-10
申请号：US16379050
申请日：2019-04-09
Applicant: Textron Aviation Inc.
Inventor： Gayle Juracek , Ryan Culp , Justin Birkey
Abstract: An oleo strut includes an outer cylinder forming a first fluid chamber and an inner cylinder forming a second fluid chamber. The inner cylinder is adapted for sliding concentrically within the outer cylinder in a longitudinal direction. An orifice plate, which is located within the inner cylinder, has holes for fluidly coupling the first fluid chamber with the second fluid chamber. A free-floating washer is constrained in a slot of the orifice plate adjacent the holes and is adapted to move in the longitudinal direction for alternatively blocking and unblocking at least a portion of the holes. During compression of the oleo strut, fluid pushes the washer away from the holes for reducing resistance to fluid flow. During extension of the oleo strut, fluid pushes the washer against the orifice plate covering at least a portion of the holes, which increases the damping force and reduces the extension speed.
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公开(公告)号：US11204075B2
公开(公告)日：2021-12-21
申请号：US16379050
申请日：2019-04-09
Applicant: Textron Aviation Inc.
Inventor： Gayle Juracek , Ryan Culp , Justin Birkey
Abstract: An oleo strut includes an outer cylinder forming a first fluid chamber and an inner cylinder forming a second fluid chamber. The inner cylinder is adapted for sliding concentrically within the outer cylinder in a longitudinal direction. An orifice plate, which is located within the inner cylinder, has holes for fluidly coupling the first fluid chamber with the second fluid chamber. A free-floating washer is constrained in a slot of the orifice plate adjacent the holes and is adapted to move in the longitudinal direction for alternatively blocking and unblocking at least a portion of the holes. During compression of the oleo strut, fluid pushes the washer away from the holes for reducing resistance to fluid flow. During extension of the oleo strut, fluid pushes the washer against the orifice plate covering at least a portion of the holes, which increases the damping force and reduces the extension speed.
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公开(公告)号：US20240295251A1
公开(公告)日：2024-09-05
申请号：US18590458
申请日：2024-02-28
Applicant: Textron Aviation Inc.
Inventor： Justin Birkey , Raymond Charters Maple
CPC classification number: F16F9/49 , B64C25/58 , F16F2222/126 , F16F2230/16
Abstract: A gas backflow restrictor system as part of an aircraft strut includes the strut defining an inner volume having a first chamber and a second chamber; an orifice plate positioned within the inner volume and separating the first chamber and the second chamber; a standpipe attached to the orifice plate and extending longitudinally within the inner volume, the standpipe having openings extending through a thickness of a wall forming the standpipe, the standpipe further defining an inner channel; and a restrictor mounted within the inner channel, the restrictor having a shelf extending into the inner channel and forming a central opening; the shelf is to reduce gaseous flow through one or more of the openings of the standpipe and toward the orifice plate.
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公开(公告)号：US20230257110A1
公开(公告)日：2023-08-17
申请号：US18170247
申请日：2023-02-16
Applicant: Textron Aviation Inc.
Inventor： Justin Birkey
Abstract: A compression-force spike reduction system for a strut includes a first chamber and a second chamber, an orifice plate disposed within the strut between the first chamber and the second chamber, a hydraulic fluid disposed within the first chamber and the second chamber, and a compressible portion disposed in the second chamber. The orifice plate includes at least one orifice configured for the hydraulic fluid to flow through. During compression or extension of the strut, hydraulic fluid is exchanged between the first chamber and the second chamber. The compressible portion contains a compressible medium configured to buffer spikes in compression force of the strut. A compression-force spike reduction method includes filling the second chamber partially with the incompressible hydraulic fluid, and filling a remaining portion of the second chamber with a compressible medium.
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