GB1416806A - Steerable undercarriages suitable for aircraft - Google Patents

Steerable undercarriages suitable for aircraft

Info

Publication number
GB1416806A
GB1416806A GB1749473A GB1749473A GB1416806A GB 1416806 A GB1416806 A GB 1416806A GB 1749473 A GB1749473 A GB 1749473A GB 1749473 A GB1749473 A GB 1749473A GB 1416806 A GB1416806 A GB 1416806A
Authority
GB
United Kingdom
Prior art keywords
leg member
rack
teeth
upper leg
wheels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1749473A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dowty Rotol Ltd
Original Assignee
Dowty Rotol Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dowty Rotol Ltd filed Critical Dowty Rotol Ltd
Priority to GB1749473A priority Critical patent/GB1416806A/en
Publication of GB1416806A publication Critical patent/GB1416806A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C25/00—Alighting gear
    • B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface 
    • B64C25/50—Steerable undercarriages; Shimmy-damping
    • B64C25/505—Shimmy damping

Abstract

1416806 Steering aircraft ground wheels DOWTY ROTOL Ltd 4 April 1974 [11 April 1973] 17494/73 Heading B7H In a steerable nosewheel undercarriage including a telescopic shock absorber 11 formed by an upper leg member 12 for attachment to an aircraft and a lower leg member 14 carrying a pair of wheels W, a cuff member 33 rotatably mounted on the upper leg member and coupled by torque links 31, 28 to the lower leg member is turned to steer the wheels W by rack-andpinion steering mechanism in which the pinion teeth run out of mesh with the rack outside a predetermined range of turning movement so that turning of the wheels through a greater angle is allowed when the aircraft is towed. The steering mechanism comprises a pinion shaft 35 connected by splines to the cuff member 33 and formed with pinion teeth 38 extending only part-way around the shaft and engaging the teeth 39 of a rack 40 upon which act pistons 41, 42 slidable in hydraulic cylinders 45, 46 fitted to the upper leg member 12. A cam 55 and feed-back roller 56 produce a follow up effect on a valve controlling supply of fluid to the cylinders 45, 56, and stop members 57, 58 determine the extremes of turning movement. A constant-diameter rack restraining ring 59 engages the end teeth 61, 62 of the rack to ensure that the rack teeth are held clear of the pinion after disengagement and that the teeth re-engage smoothly. A shimmy damper 63 comprises annular friction members 73, 74, 75 interposed between friction plates 69, 70 and 70, 72 which are splined to the cuff member 33 and to a housing 65 on the upper leg member 12 respectively and are loaded by disc springs 76. The lower leg member 14 is provided with a piston 16 slidable in the upper leg member 12 and a damping valve 19 which restricts flow between a liquid chamber 20 formed in the upper leg member 12 and a liquid chamber 21 formed in the lower leg member 14 and separated by a floating piston 22 from a pressurized nitrogen chamber 23.
GB1749473A 1973-04-11 1973-04-11 Steerable undercarriages suitable for aircraft Expired GB1416806A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1749473A GB1416806A (en) 1973-04-11 1973-04-11 Steerable undercarriages suitable for aircraft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1749473A GB1416806A (en) 1973-04-11 1973-04-11 Steerable undercarriages suitable for aircraft

Publications (1)

Publication Number Publication Date
GB1416806A true GB1416806A (en) 1975-12-10

Family

ID=10096155

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1749473A Expired GB1416806A (en) 1973-04-11 1973-04-11 Steerable undercarriages suitable for aircraft

Country Status (1)

Country Link
GB (1) GB1416806A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485472A1 (en) * 1980-06-27 1981-12-31 Messier Hispano Sa RELEVABLE AND ORIENTABLE LANDING TRAIN FOR AN AIRCRAFT
GB2161123A (en) * 1984-07-05 1986-01-08 Dowty Rotol Ltd Aircraft retractable and steerable undercarriages
FR2568218A1 (en) * 1984-07-30 1986-01-31 Messier Hispano Bugatti Sa AIRCRAFT AIRCRAFT LIFT WITH RELEASE AND AUTOMATIC SAFETY CLUTCH
EP0228363A2 (en) * 1981-12-08 1987-07-08 VESTERGAARD, Godtfred Suspension means for a spray nozzle
EP2107004A2 (en) 2008-04-01 2009-10-07 Goodrich Actuation Systems Ltd. Damping arrangement
CN102020014A (en) * 2010-12-09 2011-04-20 南京航空航天大学 Airplane landing gear with deflected airplane wheel retraction jack
US8944368B2 (en) 2010-01-26 2015-02-03 Airbus Operations Limited Aircraft steering actuator
CN107939896A (en) * 2017-11-22 2018-04-20 中航飞机起落架有限责任公司 A kind of band friction rotation stop subtracts the buffer unit of pendulum function

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0043755A1 (en) * 1980-06-27 1982-01-13 Messier-Hispano-Bugatti (S.A) Steerable and retractable aircraft landing gear
FR2485472A1 (en) * 1980-06-27 1981-12-31 Messier Hispano Sa RELEVABLE AND ORIENTABLE LANDING TRAIN FOR AN AIRCRAFT
EP0228363A2 (en) * 1981-12-08 1987-07-08 VESTERGAARD, Godtfred Suspension means for a spray nozzle
EP0228363A3 (en) * 1981-12-08 1989-05-10 Godtfred Vestergaard Suspension means for a spray nozzle
GB2161123A (en) * 1984-07-05 1986-01-08 Dowty Rotol Ltd Aircraft retractable and steerable undercarriages
FR2568218A1 (en) * 1984-07-30 1986-01-31 Messier Hispano Bugatti Sa AIRCRAFT AIRCRAFT LIFT WITH RELEASE AND AUTOMATIC SAFETY CLUTCH
US4610411A (en) * 1984-07-30 1986-09-09 Messier-Hispano-Bugatti (S.A.) Steerable aircraft landing gear having automatic safety declutching and enclutching
EP2107004A2 (en) 2008-04-01 2009-10-07 Goodrich Actuation Systems Ltd. Damping arrangement
EP2107004A3 (en) * 2008-04-01 2011-02-02 Goodrich Actuation Systems Ltd. Damping arrangement
US8960386B2 (en) 2008-04-01 2015-02-24 Goodrich Actuation Systems Limited Damping arrangement
US8944368B2 (en) 2010-01-26 2015-02-03 Airbus Operations Limited Aircraft steering actuator
CN102020014A (en) * 2010-12-09 2011-04-20 南京航空航天大学 Airplane landing gear with deflected airplane wheel retraction jack
CN102020014B (en) * 2010-12-09 2012-11-21 南京航空航天大学 Airplane landing gear with deflected airplane wheel retraction jack
CN107939896A (en) * 2017-11-22 2018-04-20 中航飞机起落架有限责任公司 A kind of band friction rotation stop subtracts the buffer unit of pendulum function

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee