CA2024517A1 - Wheel-gripping transfer device - Google Patents

Abstract

(57) Abstract The object of the invention is a transfer device that grips one or more wheels (6), which is intended to move an aircraft (1) or other wheeled device over a base, which transfer device includes two rollers (3, 4) which are placed on opposite sides of the wheel 86) and pressed against the wheel (6), at least one of which is a friction roller (3, 4) driven by a motor, pressure devices 82) to create the aforementioned pressure, and three or more support wheels (7, 8) for the independent movement of the transfer device. The intention of the invention is to create a transfer device the power transmission required for the indepen-dent movement of which is simple and reliable. According to the invention the transfer device's own wheel (8) or an auxilliary wheel that drives it is located in the track of movement of the friction roller (4), in which case the friction roller (4) is operationally pressed alternatively against either the air-craft's wheel (6) or the transfer device's own wheel (8) to transmit drive to one or other of these.

Description

202,~517 A Wheel-gripping Transfer Device The ob~ect of the invention i~ a transfer device that grips one or more wheels, whlch 1~ ~ntended to move an aircra~t or other 5 wheeled device over a base, whic~ transSer device includes two rollers that are placed on opposite sides Or the wheel and press against it, at least one of which rollers is a friction roller rotated by means of a motor, compression devices to create the a~orementioned preosure, and three or more ~upport wheel~ and 10 drive devices ~or the independent movement o~ the device There may be several presoure and ~riction rollers ~or each wheel to be driven The weight o~ a transfer device can be substantially reduced 15 when the rotational ~orce is tran~erred to the aircra~t's own wheel ~rom the drive wheel i e ~riction roller belonglng to the transfer device A light construction Sor an entirely general purpose trans~er device i~ shown in Finnish Patent Applioation FI 833275 ~partly corresponding to W085/ 01265) 20 Thls do-~ not require any contact with th- bogie o~ the air-cra~t in order to pre~s the driv- wheel against th- alrcra~t wheel The pressure i~ created by mean- of the mutual movement ~ -of pressure roll-rs plaoed around the wheel o~ the aircra~t and aonn-ct-d by an int-rmediate devic- ~-In lt- mo-t g-n-ral ~orm th- intermedlate device draws th- two pre-sur- roller~ connected by it toward~ one anoth-r, when the are pr--~-d again-t the wheel b-twe-n th-m At lea~t on- o~ the pr--s-d wheels is now th- ~riction roller, l e drive wheel, ~ ~ ;
30 whioh transm$ts th- rotational ~orc- to the wheel o~ th- air~
cra~t Other trans~er devicos that belong to the ~i-ld o~ the i`nvention are shown in Finnish Patent Applications FI861714, FI870313, and FI870710, as well as in 8wedish Patent Publication In practice nearly all aircraft are equipped with either double wheel~ or even larg-r bogie wheel~ It i- thus natural to ~ake the transfer devloe such that lt qrlps doubl- wheel~, becaus- in ~;
that case the greatest force applied to the tyre can be reduced 40 In thl~ sense transfer devices equipped with so-called sel~

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wedging fri¢tion rollers are not advantageous, because they stress the wheel of~ the aircraf~t considerably more than a transfer device that grips each wheel with two or more friction -rollers A transfer device that grips a double wheel, especially the nose bogie wheels, is ~hown in US Patent Publication 3,005,510 In it the wheels beside each other are driven by means of a friction ~ - ;
roller mat, which is wedged between the in line bogie wheels , ,,,, " ", Most typically the transfer device's own drive is implemented by means of rotating devices connected to the support wheels, or ;~
else the transf~er device is intended to be moved manually During the transfer tage tho transfer device i8 movod by the lS wheel of the aircraft or other device In thi~ case th- trane-fer device's own ~upport wheels ~ust be ~reely turnable eo that th- trans,S-r devia- can turn when th- wheel being transf'erred turns Thi- cauee~ difficultie- especially in the case o~
~upport wheels connected to the power transmission, becauee the .`,t,.,',,`"".,20 power trans~ission makee dif~icultios for the arrangements f'or th- turning of the wheel On th- other hand, in order to make th- ind~p-nd-nt t--rlng Or th- trans,ror devico poeeible, the ;~ ~
whe-ls, which are not teered, mu~t be locked into th- atraight !~ ",,, "
po~ition rOr the duration of independent driving Thi~ hae been 2S typically solved by adding ~-parat- locking devicee to such wheels ;~

The intention o~ this invention is to create a transfer device, ' in whioh the power transmission required ~or independent move- -30 m-nt is both simple and reliable The characteristice o~ the invention appear in the accompanying Patent Claim 1 -- :, . ..
The ~orm o~ application tn acoordance with Patent Claim 2 eolves, ln a simple manner the locking o~ th- transfer device'e own 35 wheels during independent movement and their release in the trans~er ~tage By means of the friction roller it possible to advantageously transmit the drive and to lock the direct of certain support wheele straight forward In particular a trans- j~

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~,, 2~2~17 Per device gripping double or 'bogie wheels oan be realized advantageously in accordance with Patent Claim 3 In what follows the invention is illustrated by reference to the 5 accompanying Figures, which ~how one form of applicatlon of the invention Figure 1 show~ the transfor device being driven around the double wheel of an aircraft 10 Figure 2 show- tbe tran~fer device in the operating posi-tion seen ~ro~ above and in partial cro~s-~ection Figure 3 shows the tran-~er devlce een from the ~ide Figure 4 ~how- the hydrauli¢ schem- o~ the tran~er device 15 In Figures 1-3 the aircraft 1 i- repreeented by only a part of the undercarriage and the whoel- 6 The tran-fer d-vice run- on it~ upport wheelo 7 and 8 Th- ~ront frict~on roller~ 3 ar-loaated on a gulde 11 that moves laterally and the rear friction roller- 4 on a lide member 12, which i- arranged to move along 20 longitudinal guides 13 that are w-lded to tho ~ram 2 Th- rear rrlation roller- 4 rotate alternatively either the wheel 6 o~
th- alrora~t 1 or th- tranerer d-vic-'- own rear wheel- 8 The slido~ 12 ot the rear rrlctlon roller- ar- moved by m an- o~
th- hydraulia ayllnd-r 14, by mean- o~ which the pr s-ur- that 2S 18 e-~entIal in frlction tran~mi--ion i- al~o croat-d When tho trànst-r d-vic- i- driven away, th- r-ar triation roller- 4 turn ; th~ r-ar wh-el- 8 of tho tran-for devic- atraight ahoad and t~erlng tak-- plac-d by turning tho front wh--l- 7 with the aid ot a cable mechanis~ 9 When th- tran-fer d-vlce i~ attached to 30 the double wheel 6 o~ the aircraft 1,, the trans~er devic-'~ own wheels 7 and 8 both in front and at the rear are ~ree to turn when the wheel 6 o~ the aircraft 1 turns In Figure 3 the wheel 6 o~ the aircraft is shown by broken 95 llne~ ~he rear ~riation roller 4 iB ~hown ln alternative po~itions 4 and 4', in the former Or whiah it rotat-~ the transrer device'~ own rear wheels 8 and in the latter or which the wheel 6 of the aircraft 1 The rear ~riction roller~ 4 are ,~ ~':~'" ,, ,. ~", ,;,, ~, " ......

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rotated by hydraulic motors 20, which do not appear separately in Figures 1-3.

The frame 2 of the transfer device includes side tubes, which 5 are connected to the rear section 5. The sliding members 3 and 4 of' the f'riction rollers and their moving devices are located ;;
in these side tubes. A diesel motor and a hydraulic pump driven by lt together with control devices are located in the rear sectlon. In addition other nece~sary control and ad~ustment 10 devices are located in the rear section 5. -~
. ~,:', Figure 4 shows a schematic diagram of the hydraulic circuit of the transf,'er device. Only f'eatur2s o_' the right-hand side pressure cylinders 14 drive motors 20, 19 are shown as they are 15 symmetrical.
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The diesel motor drives a pump unit, which includes an auxil-llary pump 23 and normal 10~B oil pump in addition to the high-pressure pump 22. The high-pre~ure pump 22 in the drive 20 oil circuit drives the motors l9 and 20 o~' the f'riction rollers 3 and 4. The motors 19 of the from f'riction rollers 3 can be shut of,'f' during independent movement by means of' the electric directlon valve 21. Another possibility iB to use here a mechanical connection to lock roller~ 3.
Oil is led to the pressure cylindero 14 is such a way that if' driv- pre~sure is insu'~'icient they receive pressurized oil f'eed from the auxilliary oil pump 23 through the counter pressure valve 25, otherwise they are ~'ed ~'rom the high-pressure pump 22 30 through two counter pressure valves 24 and 25. The pressure cylinder 14 is used to move the rear ~'riction rollers 4 alter-natively either against the transf,'er device's own support wheel 8 or against the wheel 6 of' the aircraf,'t 1. Selection of' direc-tion takes place by mean~ of' valve 27.
The lateral movement oylinders 18 receive their f'eed continuous-ly f'rom the auxilliary oil pump,23 and changes in their direc-tion are carried out wlth the aid o~' valve 26. Return oil f,'rom 2024~1 ) the lateràl movement and pres~ure ¢ylinder~ 18 i~ led to the ~-1088 oil reservoir 28.

The front friction rollers equipped with lateral movement make 5 lt posslble to use the transfer devlce not only with normal double wheels but also with set~ o~ bogie wheels, be¢ause the ~ront friction roller~ 3 can be placed b-tween wheel~ that are ln line. :

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Claims (3)

1. A transfer device that grips one of more wheels (6), which is intended to move an aircraft (1) or other wheeled device over a base, which transfer device includes two rollers (3, 4) that are placed on opposite sides of the wheel (6) and that press against the wheel (6), at least one of which is a friction roller (3, 4) rotated by means of a motor, pressure devices (2) to create the aforementioned pressure, and three or more support wheels (7, 8) and drive devices for the indepen-dent movement of the transfer device, characterized in that the transfer device's own support wheel (8) or an auxilliary wheel rotated by it is placed in the line of movement of the friction roller (4), when the friction roller (4) is operationally pressed against either the aircraft wheel (6) or the transfer device's own wheel (8) to transmit drive to one or other of these wheels.

2. A transfer device in accordance with Patent Claim 1, the support wheels of which includes driven rear wheels (8), characterized in that at least two of the support wheels (8) of the transfer device are arranged as a pair on the same axle, which is arranged to turn freely around a vertical axis, and which support wheels (8) are arranged to be driven during the independent movement of the transfer device by a friction roller (4) that extends on top of both wheels (8), the track of move-ment of which is determined by means of longitudinal guides (13) and which is then arranged to turn the direct of travel of these support wheels (8) forwards.

3. A transfer device gripping double wheels, in accordance with Patent Claim 2, characterized in that the transfer device has essentially a U-shaped frame (2), the forked front section of which has on both sides a friction roller (3) equipped with lateral movement and the rear part of the forks have friction rollers (4) located on a longitudinal guide (13) on both sides, which drive either the wheel (6) of the aircraft (1), or the transfer device's own rear wheels (8) that are located in pairs on the same axle.