WO1991005698A1 - Jam resistant ball screw actuator - Google Patents
Jam resistant ball screw actuator Download PDFInfo
- Publication number
- WO1991005698A1 WO1991005698A1 PCT/US1990/004987 US9004987W WO9105698A1 WO 1991005698 A1 WO1991005698 A1 WO 1991005698A1 US 9004987 W US9004987 W US 9004987W WO 9105698 A1 WO9105698 A1 WO 9105698A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- screw
- nut
- axis
- actuator
- ball screw
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/205—Screw mechanisms comprising alternate power paths, e.g. for fail safe back-up
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/22—Compound rotorcraft, i.e. aircraft using in flight the features of both aeroplane and rotorcraft
- B64C27/28—Compound rotorcraft, i.e. aircraft using in flight the features of both aeroplane and rotorcraft with forward-propulsion propellers pivotable to act as lifting rotors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C29/00—Aircraft capable of landing or taking-off vertically, e.g. vertical take-off and landing [VTOL] aircraft
- B64C29/0008—Aircraft capable of landing or taking-off vertically, e.g. vertical take-off and landing [VTOL] aircraft having its flight directional axis horizontal when grounded
- B64C29/0016—Aircraft capable of landing or taking-off vertically, e.g. vertical take-off and landing [VTOL] aircraft having its flight directional axis horizontal when grounded the lift during taking-off being created by free or ducted propellers or by blowers
- B64C29/0033—Aircraft capable of landing or taking-off vertically, e.g. vertical take-off and landing [VTOL] aircraft having its flight directional axis horizontal when grounded the lift during taking-off being created by free or ducted propellers or by blowers the propellers being tiltable relative to the fuselage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/18—Mechanical movements
- Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
- Y10T74/18576—Reciprocating or oscillating to or from alternating rotary including screw and nut
- Y10T74/18592—Auxiliary drive [e.g., fluid piston, etc.] for load
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/19—Gearing
- Y10T74/19642—Directly cooperating gears
- Y10T74/19698—Spiral
- Y10T74/19702—Screw and nut
- Y10T74/19744—Rolling element engaging thread
- Y10T74/19749—Recirculating rolling elements
- Y10T74/19767—Return path geometry
Definitions
- This invention relates to the field of actuators, and in particular to an actuator for moving a pylon in an aircraft.
- a ball screw actuator In aircraft design, many actuators are required to move certain movable elements of the craft relative to other reaction elements.
- One example of such a use is in the actuation of flaps on a conventional fixed wing aircraft.
- the actuator would ideally be extremely reliable, lightweight, compact, and require a minimum energy input for actuation, among other requirements.
- the ball screw actuator is commonly employed in aircraft applications. Simply put, a ball screw actuator includes a nut with internal threads and a screw with external threads. A plurality of spherical balls are captured within the threads of the nut and engage the threads on the screw.
- the nut could be mounted on a reaction element and the screw on a moving element in an aircraft to form an actuator. While the ball screw actuator is much less resistant to jamming than a simple threaded engagement between a nut and a screw, jamming can occur. Further, balls may be lost from the nut, reducing or eliminated the ability to translate the screw axially. Further, the screw may be the only fixed connection between the moving element and the reaction element and, should the screw crack apart, catastrophic results could ensue. In recent years, an aircraft has been under development which is commonly referred to as a tilt rotor aircraft.
- a rotor or propeller, and its associated power plant is mounted on a pylon which can pivot on the aircraft between a conventional flight mode and a helicopter mode.
- the propeller rotates in a vertical plane to drive the aircraft forward as in a conventional prop driven aircraft.
- the pylon and propeller can then be converted or pivoted to position the propeller in essentially a horizontal plane, where it can act as a helicopter rotor and the aircraft operated as a helicopter for vertical takeoff and landing.
- a highly reliable and efficient actuator is necessary for the proper operation of the pylon in converting between the aircraft mode and the helicopter mode.
- a ball screw actuator positioned between a first element and a second element.
- the actuator includes a first ball screw drive unit including a first nut having a ball track and a first screw having a ball track and a plurality of drive balls engaged in the ball tracks of said first nut and said first screw to support the nut and screw concentric to one another about a first axis, relative rotation between the first nut and first screw about the first axis causing relative movement therebetween along the first axis.
- a second ball screw drive unit which includes a second nut having a ball track and a second screw having a ball track and a plurality of drive balls engaged in the ball tracks of said second nut and said second screw to support the second nut and second screw concentric to one another about a second axis, relative rotation between the second nut and second screw about the second axis causing relative movement therebetween along the second axis.
- The. first nut is mounted to the first element for rotation about the first axis.
- the second screw is mounted to the second element for rotation about the second axis.
- the first screw and second nut are fixed together with the first and second axes coincident for joint rotation.
- a ball screw actuator for positioning between a first element and a second element.
- the actuator includes a nut having a ball track and a screw having a ball track.
- a plurality of drive balls are engaged in the ball tracks of said nut and screw to support the nut and screw concentric to one another about a first axis. Relative rotation between the nut and screw about the first axis causing relative movement therebetween along the first axis.
- the screw has first and second ends.
- the invention further comprises a member extending along the screw and confining the ends of the screw to form a redundant load path.
- FIGURE 1 is an illustrative view of the range of motion of an actuator forming a first embodiment of the present invention to convert a pylon between an aircraft mode and a helicopter mode;
- FIGURE 2 is a vertical cross sectional view of the actuator and pylon in the aircraft mode;
- FIGURE 3 is a horizontal cross sectional view of the pylon and actuator in the aircraft mode
- FIGURE 4 is a cross section of an element of the actuator taken along lines 4-4 in FIGURE 2;
- FIGURE 5 is a side view of the element in FIGURE 4.
- FIGURE 6 is a schematic illustration of the actuator
- FIGURE 7 is a schematic illustration of the actuator
- FIGURE 8 is an illustrative cross sectional view of the inner ball screw assembly of the actuator
- FIGURE 9 is an illustrative cross sectional view of the inner ball screw assembly and outer ball screw of the actuator.
- FIGURE 10A-10C illustrates the range of motion of the actuator:
- FIGURE 11 is an illustrative cross sectional view of a modification of the actuator.
- an actuator 10 which forms a first embodiment of the present invention.
- the actuator 10 is mounted between a reaction element, in this case an aircraft wing 12, and a moving element, in this case a pylon 14 (FIGURE 2).
- the pyloi mounts the rotor of the tilt rotor aircraft and its powerplant.
- the actuator 10 is operated as will be described in detail hereinafter, to move between a retracted position 16 and an extended position 18, thereby moving the pylon and rotor between the aircraft mode and the helicopter mode, respectively.
- Actuator 10 is jam resistant and is provided with dual or redundant load paths for enhanced safety.
- Actuator 10 is a dual ball screw actuator which includes an inner ball screw drive unit 20 and an outer ball screw unit 22, both of which are actuated to move the actuator between the fully retracted and fully extended positions.
- the use of dual drive units provides a fail/safe mode should one of the screw drive units jam, the other drive unit can remain operable for a reduced range of motion of the actuator.
- the inner ball screw drive unit 20 can be seen to include an inner ball screw assembly 24 and an inner nut 26.
- the inner ball screw assembly 24 includes a concentric inner ball screw 28 and an inner tube 30.
- the outer surface of the inner ball screw 28 is provided with a helical ball track 32.
- the inner surface of inner nut 26 is provided with a similar ball track 34.
- a plurality of actuator balls 36 are engaged between the ball,tracks of the nut 26 and screw 28.
- the inner nut 26 captures the balls 36 for recirculation. If the nut 26 rotates relative to the screw 28, the nut and screw will move axially relative one another along axis 38.
- the inner tube 30 forms a significant aspect of the present invention.
- the inner ball screw 28 has ends 40 and 42.
- the tube 30 has shoulders 44 and 46 which extend around the ends 40 and 42, respectively. Therefore, if a crack develops in inner ball screw 28, the load normally carried through the inner ball screw can be carried through the tube 30, providing a redundant or dual load path.
- the inner ball screw 28 is formed of metal and the tube 30 is formed of a carbon fiber composite for lightness and strength.
- the outer ball screw drive unit 22 includes an outer ball screw assembly 48.
- Outer ball screw assembly 48 includes an outer nut 50, an outer ball screw 52, and an outer tube 54.
- Outer nut 50 has a ball track 56 formed on its interior surface while outer ball screw 52 has a ball track 58.
- inner ball screw assembly 24 a plurality of balls 36 are captured within the outer nut so that relative rotation between the outer nut 50 and outer ball screw 52 about the axis 38 will cause relative axial motion between the nut and screw.
- the outer tube 54 extends along the outer ball screw 52 with the ends 60 and 62 of outer ball screw 52 confined by shoulders 64 and 66 on the outer tube 54 to provide a redundant or dual load path for the outer ball screw assembly.
- outer ball screw 52 is preferably formed of metal, while the outer tube 54 is a carbon fiber composite.
- the outer ball screw 52 is secured at one end to the inner nut for joint rotation about axis 38.
- the outer nut 50 is mounted for rotation about the axis 38 in a thrust ring 68 between roller thrust bearings 70 and 72.
- An annular drive gear 74 is formed as part of or mounted on the outer nut 50.
- a first hydraulic drive motor assembly 76 and a second hydraulic motor drive assembly 78 are provided to rotate the gear 74 and outer nut about the axis 38.
- Each hydraulic motor drive assembly is provided with a hydraulic motor 80, a hydraulic brake 82, suitable solenoid operated control valves 84, and are connected to separate hydraulic supplies 86 and 88.
- Each hydraulic motor 80 has a drive shaft 90 and a drive gear 92 to engage drive gear 74.
- the thrust ring 68 is pivotally mounted to the wing 12 of the aircraft between forks on a conversation actuator spindle 150 for pivotal motion about both axis 152 and axis 154.
- a lug 94 is pivotally mounted to the pylon, also as seen in FIGURES 2-5.
- the lug receives a first end 96 of the inner ball screw 28, which fixes the inner ball screw 28 relative to the lug along axis 38, but permits rotation of the inner ball screw 28 about axis 38 relative to the lug 94.
- the first end 96 of the inner ball screw 28 is provided with a worm wheel 98 which engages a worm gear 100 mounted for rotation in the lug 94 about an axis 102 perpendicular axis 38.
- the shaft 104 on which the worm gear 100 is fixed extends to gears 106 and 108.
- Gear 106 is engaged by the drive shaft of an electric motor 110 which has an internal motor brake 112.
- Gear 108 is engaged with a second motor brake 114.
- the motor brakes 112 and 114 will be activated to prevent rotation of the worm gear 100 and thus prevent the inner ball screw 28 from rotating about axis 38.
- Rotation of one or both of the hydraulic motors 80 will cause rotation of the outer nut 50 about axis 38. Because inner ball screw 28 is fixed, axial displacement will occur between the outer nut 50 and the inner ball screw 28 along axis 38 to pivot the pylon 14 relative the aircraft wing 12.
- both nuts In moving between the fully retracted and fully extended positions, both nuts will run the complete length of the screws with which they are engaged. However, as the actuator moves between these limits, at any given position, the outer ball screw could be moving through the outer nut, the inner nut could be moving along the inner ball screw, or both motions occurring simultaneously. Under ideal conditions, it would be expected that the inner nut would run along the inner ball screw through its full range of motion and the outer ball screw would then move through the outer nut through its full range of motion in moving from the retracted to the extended position.
- the pylon can be stopped and held at any position between full retraction and extension by a combination of controlling the motors and applying all brakes 82, 112 and 114.
- a stop 120 is mounted on the outer ball screw 52 to engage the outer nut when the actuator is in the fully retracted position.
- a stop 122 at the opposite end of the outer ball screw 52, engages the outer nut 50 when the outer ball screw assembly 48 is fully extended. When stop 122 engages the outer nut 50, the engagement is made with sufficient force to ensure joint rotation of the outer nut 50, outer ball screw 52 and inner nut 26 to ensure operation of the inner ball screw assembly.
- a stop 124 (not shown) is mounted at the end 126 of inner ball screw 28 opposite end 96 to limit the motion of the inner nut in the extended position of the inner ball screw assembly.
- a stop 127 is mounted at end 96 to limit the motion of the inner nut at the retracted position of the inner ball screw assembly.
- the other ball screw assembly will still be available for moving the actuator through the entire range of motion provided by that ball screw assembly.
- operation of a single ball screw assembly will permit the rotor to be moved from the aircraft mode position to a position intermediate the aircraft mode and helicopter mode to allow the aircraft to land without the rotors hitting the ground.
- the dual or redundant load path provided by the composite tubes 30 and 54 is also a significant advantage of the present invention. As noted previously, should one of the ball screws fail, the load can be carried by the associated concentric tube to prevent total failure of the actuator 10. Even if the failure of a ball screw jams the associated ball screw assembly, the remaining ball screw assembly can be utilized to provide limited motion of the pylon.
- the actuator is designed to move 44 inches between the retracted position and the extended position. In mounting between the aircraft wing and pylon, this motion pivots the pylon on conversion spindle 160 about its conversion axis 128 through an arc of about 90°, providing a 45° arc of motion for each of the ball screw assemblies. When both hydraulic motors are operable, the actuator is designed to move 3.6 inches per second.
- the pylon engages fixed stops on the wing at the limits of its motion.
- the actuator 10 can be utilized to provide a significant force on the pylon to hold the pylon against one of those stops to reduce vibration, particularly in the aircraft mode.
- the hydraulic motors 80 can be continuously actuated to load the actuator and provide a 13,000 lb. force urging the pylon against the stop mounted on the wing in the aircraft mode.
- FIGURE 11 shows a modification of the actuator 10 which, in many respects, is identical to that described previously and is therefore identified with the same reference numerals.
- motor 110 can be seen to rotate an annular gear 140 attached to the first end 96 of the inner ball screw, thereby substituting for the worm wheel and worm gear construction as discussed previously.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP91900519A EP0448711B1 (en) | 1989-10-13 | 1990-09-06 | Jam resistant ball screw actuator |
DE69023479T DE69023479T2 (en) | 1989-10-13 | 1990-09-06 | EAT-RESISTANT BALL SCREW. |
JP03501025A JP3074392B2 (en) | 1989-10-13 | 1990-09-06 | Fault-tolerant ball screw actuator |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/421,087 US5092539A (en) | 1989-10-13 | 1989-10-13 | Jam resistant ball screw actuator |
US421,087 | 1989-10-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991005698A1 true WO1991005698A1 (en) | 1991-05-02 |
Family
ID=23669118
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1990/004987 WO1991005698A1 (en) | 1989-10-13 | 1990-09-06 | Jam resistant ball screw actuator |
Country Status (7)
Country | Link |
---|---|
US (1) | US5092539A (en) |
EP (1) | EP0448711B1 (en) |
JP (1) | JP3074392B2 (en) |
AU (1) | AU6899291A (en) |
DE (1) | DE69023479T2 (en) |
IL (1) | IL95886A0 (en) |
WO (1) | WO1991005698A1 (en) |
Cited By (8)
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FR2809080A1 (en) * | 2000-05-22 | 2001-11-23 | Lucas Aerospace Fcs | ACTUATION DEVICE, PARTICULARLY FOR AIRCRAFT FLIGHT CONTROL |
WO2003052297A1 (en) * | 2001-12-14 | 2003-06-26 | Mitsubishi Denki Kabushiki Kaisha | Thrust converter |
EP1801007A1 (en) * | 2005-12-23 | 2007-06-27 | Messier-Bugatti | Telescopic actuator with a main rod and an auxiliary rod, and method applying said actuator |
FR2895482A1 (en) * | 2005-12-23 | 2007-06-29 | Messier Bugatti Sa | Telescopic actuator for deploying landing gear of aircraft, has retaining unit with step provided at auxiliary rod`s end and sleeve axially displaceable by motor, where retaining unit retains rod in retracted position inside main rod |
WO2008047066A1 (en) * | 2006-10-18 | 2008-04-24 | Moog Inc. | Jam-tolerant redundant differential-type actuators |
EP2505495A1 (en) * | 2011-03-30 | 2012-10-03 | Sinfonia Technology Co., Ltd. | Electromechanical actuator |
US9024491B2 (en) | 2012-08-15 | 2015-05-05 | Sinfonia Technology Co., Ltd. | Electromechanical actuator |
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US5961379A (en) * | 1994-03-07 | 1999-10-05 | Amada Metrecs Company, Limited | Tool grinding machine |
US5743490A (en) * | 1996-02-16 | 1998-04-28 | Sundstrand Corporation | Flap/slat actuation system for an aircraft |
US6202803B1 (en) | 1998-12-22 | 2001-03-20 | Hamilton Sundstrand Corporation | Output load limiter |
US6389915B1 (en) * | 1999-05-17 | 2002-05-21 | Alliedsignal, Inc. | Dual load path ball screw with rod end swivel |
US6220545B1 (en) * | 1999-08-06 | 2001-04-24 | Bell Helicopter Textron Inc. | Method and apparatus for sensing preload in a tilt rotor downstop |
US6247667B1 (en) | 1999-08-06 | 2001-06-19 | Bell Helicopter Textron Inc. | Tiltrotor aircraft pylon conversion system |
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US20080203223A1 (en) * | 2006-06-22 | 2008-08-28 | Cyrot Luc P | Aircraft stabilizer actuator |
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US8123161B1 (en) * | 2008-06-03 | 2012-02-28 | Hamilton Sundstrand Corporation | Aircraft landing gear unlock actuator |
US8070094B2 (en) * | 2008-07-16 | 2011-12-06 | Hamilton Sundstrand Corporation | Aircraft landing gear actuator |
US8499653B1 (en) | 2009-06-18 | 2013-08-06 | The Boeing Company | Fault tolerant electro-mechanical actuator |
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US9255632B2 (en) | 2012-05-23 | 2016-02-09 | Hamilton Sundstrand Corporation | Integrated torque limiter/no-back device |
CN103466087A (en) * | 2013-08-23 | 2013-12-25 | 中国航空工业集团公司西安飞机设计研究所 | Nacelle tilting mechanism for tilt rotor aircraft |
WO2015196436A1 (en) * | 2014-06-26 | 2015-12-30 | 深圳市大疆创新科技有限公司 | Deforming aircraft |
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US10549848B2 (en) * | 2017-04-26 | 2020-02-04 | Safran Landing Systems Canada Inc. | Deployable and retractable shock strut |
EP3421772B1 (en) | 2017-06-28 | 2019-10-02 | Goodrich Actuation Systems Limited | Telescopic ballscrew actuator |
EP3427921B1 (en) | 2017-07-14 | 2021-11-17 | Crompton Technology Group Limited | Composite ball screw |
CN108033004B (en) * | 2017-12-20 | 2023-11-07 | 长安大学 | Tilting system of tilting wing machine |
US10913542B2 (en) * | 2018-07-27 | 2021-02-09 | Textron Innovations Inc. | Conversion actuator and downstop striker fitting for a tiltrotor aircraft |
US10994839B2 (en) | 2018-07-31 | 2021-05-04 | Textron Innovations Inc. | System and method for rotating a rotor of a tiltrotor aircraft |
US11041553B2 (en) | 2019-05-14 | 2021-06-22 | Ametek, Inc. | Everted ball screw drive |
US11098790B2 (en) | 2019-05-14 | 2021-08-24 | Ametek, Inc. | Linear actuator with everted ball screw drive |
US11505313B2 (en) * | 2019-10-29 | 2022-11-22 | Textron Innovations Inc. | Conversion actuation systems and methods for tiltrotor aircraft |
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US3203269A (en) * | 1962-10-22 | 1965-08-31 | Lockheed Aircraft Corp | Telescoping screw sequencing device |
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US3501114A (en) * | 1967-02-28 | 1970-03-17 | Dassault Avions | Jack system applicable to wing control of variable geometry aircraft |
US3763747A (en) * | 1971-06-28 | 1973-10-09 | Aerojet General Co | Fluid-operable linear actuators |
US4603594A (en) * | 1984-05-31 | 1986-08-05 | Sundstrand Corporation | Fail safe actuator |
US4637272A (en) * | 1985-10-28 | 1987-01-20 | Sundstrand Corporation | Ballscrew actuator |
US4745815A (en) * | 1986-12-08 | 1988-05-24 | Sundstrand Corporation | Non-jamming screw actuator system |
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US3766790A (en) * | 1971-12-29 | 1973-10-23 | Boeing Co | Non-jamming ball screw linear actuator |
US4679485A (en) * | 1984-12-27 | 1987-07-14 | Sundstrand Corporation | Ballistic tolerant dual load path ballscrew and ballscrew actuator |
-
1989
- 1989-10-13 US US07/421,087 patent/US5092539A/en not_active Expired - Lifetime
-
1990
- 1990-09-06 EP EP91900519A patent/EP0448711B1/en not_active Expired - Lifetime
- 1990-09-06 JP JP03501025A patent/JP3074392B2/en not_active Expired - Lifetime
- 1990-09-06 DE DE69023479T patent/DE69023479T2/en not_active Expired - Lifetime
- 1990-09-06 WO PCT/US1990/004987 patent/WO1991005698A1/en active IP Right Grant
- 1990-09-06 AU AU68992/91A patent/AU6899291A/en not_active Abandoned
- 1990-10-03 IL IL95886A patent/IL95886A0/en unknown
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Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2809080A1 (en) * | 2000-05-22 | 2001-11-23 | Lucas Aerospace Fcs | ACTUATION DEVICE, PARTICULARLY FOR AIRCRAFT FLIGHT CONTROL |
EP1157923A1 (en) * | 2000-05-22 | 2001-11-28 | TRW Systems Aeronautiques Civils | Actuator, in particular for aircraft |
US6588704B2 (en) | 2000-05-22 | 2003-07-08 | Trw Systemes Aeronautiques Civils | Actuator apparatus, in particular for an aircraft flight control |
WO2003052297A1 (en) * | 2001-12-14 | 2003-06-26 | Mitsubishi Denki Kabushiki Kaisha | Thrust converter |
FR2895483A1 (en) * | 2005-12-23 | 2007-06-29 | Messier Bugatti Sa | TELESCOPIC ACTUATOR WITH MAIN ROD AND AUXILIARY ROD, AND METHOD USING THE SAME |
FR2895482A1 (en) * | 2005-12-23 | 2007-06-29 | Messier Bugatti Sa | Telescopic actuator for deploying landing gear of aircraft, has retaining unit with step provided at auxiliary rod`s end and sleeve axially displaceable by motor, where retaining unit retains rod in retracted position inside main rod |
EP1801007A1 (en) * | 2005-12-23 | 2007-06-27 | Messier-Bugatti | Telescopic actuator with a main rod and an auxiliary rod, and method applying said actuator |
US7802488B2 (en) | 2005-12-23 | 2010-09-28 | Messier-Bugatti | Telescopic actuator with a main rod and an auxiliary rod, and a method making use thereof |
WO2008047066A1 (en) * | 2006-10-18 | 2008-04-24 | Moog Inc. | Jam-tolerant redundant differential-type actuators |
EP2505495A1 (en) * | 2011-03-30 | 2012-10-03 | Sinfonia Technology Co., Ltd. | Electromechanical actuator |
US9024491B2 (en) | 2012-08-15 | 2015-05-05 | Sinfonia Technology Co., Ltd. | Electromechanical actuator |
EP3674545A1 (en) * | 2018-12-31 | 2020-07-01 | Goodrich Actuation Systems Limited | Tilt rotor control |
US11858620B2 (en) | 2018-12-31 | 2024-01-02 | Goodrich Actuation Systems Limited | Tilt rotor control |
Also Published As
Publication number | Publication date |
---|---|
DE69023479D1 (en) | 1995-12-14 |
EP0448711B1 (en) | 1995-11-08 |
JP3074392B2 (en) | 2000-08-07 |
EP0448711A4 (en) | 1993-03-31 |
IL95886A0 (en) | 1991-07-18 |
US5092539A (en) | 1992-03-03 |
DE69023479T2 (en) | 1996-04-18 |
AU6899291A (en) | 1991-05-16 |
EP0448711A1 (en) | 1991-10-02 |
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