GB719490A - Improvements in or relating to centering and damping and like apparatus for rotatable members, such as steerable wheel mountings - Google Patents
Improvements in or relating to centering and damping and like apparatus for rotatable members, such as steerable wheel mountingsInfo
- Publication number
- GB719490A GB719490A GB9611/52A GB961152A GB719490A GB 719490 A GB719490 A GB 719490A GB 9611/52 A GB9611/52 A GB 9611/52A GB 961152 A GB961152 A GB 961152A GB 719490 A GB719490 A GB 719490A
- Authority
- GB
- United Kingdom
- Prior art keywords
- slot
- piston
- wheel
- roller
- damping
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
719,490. Steering vehicles. SOC. D'INVENTIONS AERONAUTIQUES ET MECANIQUES S.I.A.M. April 16, 1952 [April 17, 1951]. No. 9611/52. Class 79(5) [Also in Group XXXIII] Apparatus for controlling the movements of a rotatable member such as a steerable wheel mounting, of the type comprising a pin or the like on the rotatable member engaging a slot adapted to transmit a restoring force when the rotatable member is positioned within a predetermined arc and disengaged when the member moves out of said arc, has the slot incorporated in a linkage backed up by resilient means and automatically displaceable and deformable to receive the pin when the member moves back within the predetermined are. As shown in Fig. 7, the pin takes the form of a roller G revolving with the member O fast with the castoring axis of a wheel. The slot is formed between two members E<SP>1</SP> and E<SP>2</SP> pivoted together at S and coupled to damping and restoring pistons P<SP>1</SP> and <SP>p2</SP>. When roller G returns to the central position after dis-engagement from the slot, member E (say) is displaced by a cam face 26 to allow the roller to regain the slot, as can be seen in Fig. 9. The construction of the restoring and damping mechanism is shown in Fig. 3. The piston P<SP>1</SP> slides in the hollow cylinder H<SP>1</SP> fitted with a stop ring t<SP>1</SP>. H<SP>1</SP> itself slides in the hollow member L<SP>1</SP> under the action of a spring R<SP>1</SP>. When the wheel is turned, as shown in Fig. 7, piston P<SP>2</SP> is pushed in and P<SP>1</SP> pulled out. Illustrating both these actions from Fig. 3, the second damping and restoring device being similar, having references with subscript 2, the pulling out of piston P<SP>1</SP> draws oil in through port 11, annular passage 18, non-return valve C\ and apertures in the diaphragm 20, to the chamber 17. Return of the piston to neutral position is damped by the throttling orifice e<SP>1</SP>. Pushing piston P<SP>1</SP> in is similarly damped, and spring R<SP>1</SP> is also compressed, storing energy for a return to the neutral position. Thus shiming is damped, and a self-centering action is set up. When the wheel member is sufficiently rotated to disengage the roller from the slot, spring R<SP>1</SP> or R<SP>2</SP> moves members E<SP>1</SP> and E<SP>2</SP> to a symmetrical position, and urges them towards the centre of member 0. For this reason the pivot S is given a rotatable cylindrical sleeve to facilitate further rotation of member 0. Re-engagement ot roller G in the slot involves displacement of E<SP>1</SP> or E<SP>2</SP>, the movement being damped by piston P<SP>1</SP> or P<SP>2</SP>. Relief valves D<SP>1</SP> and D<SP>2</SP> are provided in case pressure due e.g., to violent shiming, in chamber 17 should become dangerously high. Ports V<SP>1</SP> and V<SP>2</SP> are provided so that in the event of a failure, the wheel can be centered by admitting high pressure fluid between cylinders H<SP>1</SP> and L<SP>1</SP>, and H<SP>2</SP> and L<SP>2</SP>. By trapping this fluid, the wheel can be locked in central position.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR719490X | 1951-04-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB719490A true GB719490A (en) | 1954-12-01 |
Family
ID=9091101
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9611/52A Expired GB719490A (en) | 1951-04-17 | 1952-04-16 | Improvements in or relating to centering and damping and like apparatus for rotatable members, such as steerable wheel mountings |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB719490A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2287681A (en) * | 1994-03-19 | 1995-09-27 | British Aerospace | An aircraft steering 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 |
CN103303472A (en) * | 2013-06-24 | 2013-09-18 | 中国科学院长春光学精密机械与物理研究所 | Free deflection lag-damping type nose landing gear of small unmanned air vehicle |
CN106218872A (en) * | 2016-07-26 | 2016-12-14 | 中国科学院长春光学精密机械与物理研究所 | A kind of turn to shimmy damping device for the all-electric of unmanned plane nose-gear |
-
1952
- 1952-04-16 GB GB9611/52A patent/GB719490A/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2287681A (en) * | 1994-03-19 | 1995-09-27 | British Aerospace | An aircraft steering arrangement |
GB2287681B (en) * | 1994-03-19 | 1998-08-26 | British Aerospace | An aircraft steering 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 |
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 |
CN103303472A (en) * | 2013-06-24 | 2013-09-18 | 中国科学院长春光学精密机械与物理研究所 | Free deflection lag-damping type nose landing gear of small unmanned air vehicle |
CN103303472B (en) * | 2013-06-24 | 2015-06-10 | 中国科学院长春光学精密机械与物理研究所 | Free deflection lag-damping type nose landing gear of small unmanned air vehicle |
CN106218872A (en) * | 2016-07-26 | 2016-12-14 | 中国科学院长春光学精密机械与物理研究所 | A kind of turn to shimmy damping device for the all-electric of unmanned plane nose-gear |
CN106218872B (en) * | 2016-07-26 | 2018-06-15 | 中国科学院长春光学精密机械与物理研究所 | A kind of all-electric steering shimmy damping device for unmanned plane nose-gear |
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