CA2024585A1 - Transmission system for a transfer device gripping a double wheel - Google Patents
Transmission system for a transfer device gripping a double wheelInfo
- Publication number
- CA2024585A1 CA2024585A1 CA 2024585 CA2024585A CA2024585A1 CA 2024585 A1 CA2024585 A1 CA 2024585A1 CA 2024585 CA2024585 CA 2024585 CA 2024585 A CA2024585 A CA 2024585A CA 2024585 A1 CA2024585 A1 CA 2024585A1
- Authority
- CA
- Canada
- Prior art keywords
- transfer device
- motors
- ground wheel
- wheel
- transmission system
- 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.)
- Abandoned
Links
Landscapes
- Arrangement And Driving Of Transmission Devices (AREA)
Abstract
(57) Abstract The object of the invention is a transmission system of a transfer device gripping a double wheel, which transfer device is intended to move an aircraft (1) or other wheeled device over a base, which transfer device includes at least two friction rollers (3, 4) and motors (5) to drive them, i.e. one for each ground wheel (6) of the device (1) to be moved, and compression devices (2) to create the compression to press the friction roller (3, 4) against the ground wheel, and which system includes a power device and transmission devices to feed the operating power to the motors. The intention of the invention is to create a transmission for a transfer device that creates a steady push irrespective of a poor location of the pushing point, which is the main undercarriage. The system according to the invention includes devices to feed the operating power separately and independently of each other to each of the motors (5) driving the ground wheel (6).
Description
~`` 202~8~ ~
A Transmisslon System for a Transfer Device gripping'a Double Wheel ;
The ob~ect of the invention is a transmission system ~or a 5 transfer device gripping a double wheel, wh$ch tran~fer device is intended to move an aircraft or other device equipped with double wheels over a base, and which transfer device includes at least two friction rollers and motors to rotate them, that is, ono for each wheel of the device to be moved, a friction roller 10 to be pressed against this, and compression devices to create the pressure, and the system also includes a power device and power transmission device~ to feed the driving force to the motors Here the term double wheel also means the neighbouring wheel~ of a bogie lS
The construction o~ a trans~er device can be considerably ~ ~ ;
lightened lf the driving ~orce is transferred to the wheel of the aircra~t ~rom a drive wheel or ~riction roller ~orming part of the trans~er device A construction for a trans~er device - ;
20 that i~ universally applicable is ~hown in the Finnish Patent Applloatlon FI 833275 (partly correopondlng to W085/01265) Thls doe~ not requlre any contact with the undercarrlage o~ the alrcraft in order to pres~ the drlve wheel against the ground wh--l The oompr-~-ion i~ aohl-v-d by mean~ o~ th- mutual ~
25 mov-m-nt o~ compr-~lon roll-r~ oonnected by an lntermediate i ;
momber In lt- most common form the intermediate member pulls the two oompresslon rollers connected by it towards one another, when 30 they are pressed agalnst the ground wheel between them At least one of the compressed wheels is now a friction roller or drive wheel which transmits rotational force to the ground wheel o~
the alrcraft Other transfer devlces belonglng to the area o~
the lnvention~are ~hown in Finni~h Patent Applications FI861714, ;~
3S FI870313, and FI870710 In practice nearly all aircraft are equipped with either double wheels or even larger bogie wheels It is therefore natural to make the transfer device such that it grips a double wheel, because then the force acting on the large tyre can be reduced Trans~er devices equipped with a so-called 40 self-wedging friction roller are not advantageous in relation to . ~ .... .
:': ' "~ . .. .
202~8~
thi~, because they stress the ground wheel Or the aircraft considerably more than a transfer device that qrips both wheels with two or more friction rollers In any event this invention can also be applied for example to a transfer device in 5 accordance with application FI870710, which shows a self-wedqing trans~er device that grips a double wheel, and in which both friction rollers are eguipped wlth their own motor and gearbox A transrer device that grips double wheel~, e~pecially the nose 10 ground wheels, i~ shown in US patent publication 3,005,510 In this neighbouring bogie wheels are driven by means of two rriction tracXs, WhiCh are wedged between the two in-line bogie wheel~ ~he hydraulic transmission includes both a direction switch valve and a flow distribution valve, by means o~ which 15 the flow going to the rlght and lert side hydraulic motors can be ad~u~ted The ad~u~tment take~ place by means o~ two r-~trlotion polnt- that are connoet-d to one another, ~o that wh-n th- ono deoreas-~ in ~iz- th- oth-r increa~e~ ~y mean~ o~
thi~ the no~e bogle wheels can be made to turn by restricting 20 th- flow going to th- hydraulic motors on one side at the same tlme a- the re~trictlon on the other slde i8 lessened Thi- invention i~ e~peoially related to such transrer devices in whieh th- transfer tak ~ plae- only from one of the main 25 underearriage bogi-~ ~hi~ in it~-lf i- som thing new, becau~e ln aeoordanoe with th- ~tate o~ th- art th- drive ha- alway~
b--n ymm-trlcal Asymmetrical driv- gives the aircrart a turning fore-, whioh normally i~ of no consequenee as the alreraft can be steered in the deslred direetion by means Or the 30 nose wheels Problems may appear in certain special circumstances In terms of friction conditions an icy and snowy airfield in winter is totally different from a dry asphalt ~urfaoe in summer In addition a ~trong ~ide wind may increase the force turning the aircraft Practical experiments hav- shown 35 that moving an empty alrcrart on a very slu~hy alrfleld is extxemely difficult One tyre of the double wheel may rise by itself to carry in which case the other is able to rotate freely Another phenomenon of the same kind appears on an icy ' ' ~' '' ' .. ~
. ~.~,.'.":'".'~'' ;- 2024~8~ : -3 ' air~ield when one o~ the wheels being driven begin~ to slip on the ice All the hydraulic motors that are connected in the same circuit lose their feed pressure, because the flow leaks through the motors that are driving the slipping wheel Another seriou~
5 disturbance ari~es lf the nose wheels begin to slide laterally Twisting then takes place around the undercarriage beside that being pushed as lt remains in place The intention of this invention i8 to achieve a transmission 10 eystem ~or a transfer device driving double wheels that will creato a ~table push, even though the driving point used is the main undercarriage that is located in a dif~icult position to th- side o~ the centre line of the aircraft The characteristics of the invention appear in the accompanying Patent Claim 1 The 15 main principle o~ the invention is to ~ynchronize the operation o~ the variou~ motor~ and corr-~ponding ~riction rollers This malnly mean~ that th- friction roller~ are locked to the ~ame phas- and p--d o~ rotation I~ one o~ the wheels begin~ to olip, th- ~riction roller o~ the wheel beside it continue~ to 20 drive Thi~ ~ame loo~ing also limit~ ~ide 81ip in the nose whe-l-, because the neighbouring ground wheel~ have to turn at di~-rent rotational speed~
''.: ' ' ~:
Th- ~orm ot application in aocordance with Patent Claim 2 i~ the 25 lmpl--t solution to th- problem o~ creating looking in a hydraulio tran~mi~lon The di~tribution valve~ ~u~t absolutely be pr-o~ure oomp-n~at-d 80 that the ~low i~ not able to esoape through the motor o~ the wheel that i~ rotating ~reely A more r-llable locking operation that the above is achieved by 30 implementing the system in accordance with Patent Claim 3, in which case the synchronization o~ the motors as realized through the op-rating components is considerably more pr-cise than the ~ormer The turning of the device to be moved while it i~ being mov-d i8 made possible by lmplementing th- ~y~tem in accordance 3S with Patent Claim 4 Thls is especially important in connection with a trans~er device equipped with two pumps and entirely separate circuits, but it is also use~ul in connection with hydraulic circuits created with flow distribution valves The .
~ 2024~8~
invention can also be adapted to operation with electri¢
transmi~sion. The control of electric motors i~ most advantageously based on frequency trans~ormer technology and the entire system can be based on diesel-electrlc transmis~ion.
The ~orm o~ application in accordance with Patent Claim 7 makes lt possible for the turning moment created by the one-sided push Or the new method to be cancelled. In addition to the pushing ~orce a turning ~orce is al50 developed by the trans~er device, 10 which cancel~ either entirely or in part the turning ~orce given to the aircraft by the pushing force. A braking device is most easily created in a hydraulic system e,quipped with two pumps by setting the pumps asynchronously, l.e. 80 that the output of the one pump is set to be less than that o~ the other.
In what ~ollows the invention is illustrated with the aid of example~ by re~erence to the accompanying ~igures, which show variou~ ~orms o~ application of the invention.
20 Figur- 1 ~how~ the u~e of the tran~er device in moving an airara~t Figur- 2 shows the transfer device in the operating position seen ~rom above Flgur- 3 how~ the hydraulic transmission sy~tem o~ a trans~er device in accordance with Figure 2 a~ a whematlc diagram Figure 4 shows a flow distribution valve in cross-section Fiqur- S shows another hydraulic transmission oystem a~ a 6chematic diagram In the situation shown in Figure 1 the transfer device 20 is pushing aircraft 1 ~rom the right-hand main undercarriage 21, in which there is a double wheel. The push causes a turning moment around the le~t-hand undercarriage, which moment i~ cancelled by 3S the nos- wheel 22 o~ the aircra~t. Figure 1 includes an arrow showing the pushing ~oroe o~ the tran~fer devic- and a broken line showing the counter moment that arises in one form of application, which cancels the force turning the aircraft. ;;
.-. . . .
5 ! 2 Q ~ ~ ~ 8 ~ ~
, .... :.:..:
During the transfer the aircraft 1 i8 steered by turning the nose wheel 22 in the desired direction.
In Figure 2 only the undercarriage and ground wheels 6 of the S airoraft 1 are shown. The transfer device moves on its own wheels and in addition to them the principal components are friation roller~ 3 and 4, the hydraulic motors 5 that drive them together with gearboxes and power unit, which includes a hydraulic pump unlt driven by a diesel motor.
~oth ground wheels 6 have their own friction rollers 3 and 4, both o~ which are driven by hydraulic motor 5. The front friction motor~ 4 are arranged, in a known manner, to be turned to the sid-, so that the transfer device can mov- around the 15 ground wheels 6 of the aircraft 1. The ~upport o~ the front roller 4 io arranged by mean~ o~ ~liding member 7, which is moved by means o~ hydraulio oylinder 7 and which in ito extreme posltion is also allowed to turn. Figure 2 shows the ~ame stage in pu~hing as Figure 1.
The prlncipal components of the hydraulic transmission sy~tem in Flgure 3 are the pump unit drlven by diesel motor 8, the hydraullc motor- 5, and pre~sur- compen~at-d ~low di~tribution valve~ 10. ~he pump unit includes a high pressure pump 9 and its 25 feed pump and lubricating oil oystem. Changes in direction and g-aring ~ake place by altering the ~troke capacity of the high pre~sure pump 8 and the direction of the flow. The motor~ 5 are divid-d into two qroupo by means of the tlow distribution valves 10. One group drives the right-hand and the other the left-hand 30 ground wheel 6. The ~low distribution valves 10 really only operate in one direction, in the reverse direction they permit a free flow. On account of this two o~ them are requlred, one for each direction.
35 Figure 4 shows the construction of a pressure-compensated ~low distribution valve 10 in detail. The pipe coming from pump 9 is oonneoted to connection 11 and the pipe~ coming ~rom the motor~
5 are connected to connections 12. The principal directions o~
A Transmisslon System for a Transfer Device gripping'a Double Wheel ;
The ob~ect of the invention is a transmission system ~or a 5 transfer device gripping a double wheel, wh$ch tran~fer device is intended to move an aircraft or other device equipped with double wheels over a base, and which transfer device includes at least two friction rollers and motors to rotate them, that is, ono for each wheel of the device to be moved, a friction roller 10 to be pressed against this, and compression devices to create the pressure, and the system also includes a power device and power transmission device~ to feed the driving force to the motors Here the term double wheel also means the neighbouring wheel~ of a bogie lS
The construction o~ a trans~er device can be considerably ~ ~ ;
lightened lf the driving ~orce is transferred to the wheel of the aircra~t ~rom a drive wheel or ~riction roller ~orming part of the trans~er device A construction for a trans~er device - ;
20 that i~ universally applicable is ~hown in the Finnish Patent Applloatlon FI 833275 (partly correopondlng to W085/01265) Thls doe~ not requlre any contact with the undercarrlage o~ the alrcraft in order to pres~ the drlve wheel against the ground wh--l The oompr-~-ion i~ aohl-v-d by mean~ o~ th- mutual ~
25 mov-m-nt o~ compr-~lon roll-r~ oonnected by an lntermediate i ;
momber In lt- most common form the intermediate member pulls the two oompresslon rollers connected by it towards one another, when 30 they are pressed agalnst the ground wheel between them At least one of the compressed wheels is now a friction roller or drive wheel which transmits rotational force to the ground wheel o~
the alrcraft Other transfer devlces belonglng to the area o~
the lnvention~are ~hown in Finni~h Patent Applications FI861714, ;~
3S FI870313, and FI870710 In practice nearly all aircraft are equipped with either double wheels or even larger bogie wheels It is therefore natural to make the transfer device such that it grips a double wheel, because then the force acting on the large tyre can be reduced Trans~er devices equipped with a so-called 40 self-wedging friction roller are not advantageous in relation to . ~ .... .
:': ' "~ . .. .
202~8~
thi~, because they stress the ground wheel Or the aircraft considerably more than a transfer device that qrips both wheels with two or more friction rollers In any event this invention can also be applied for example to a transfer device in 5 accordance with application FI870710, which shows a self-wedqing trans~er device that grips a double wheel, and in which both friction rollers are eguipped wlth their own motor and gearbox A transrer device that grips double wheel~, e~pecially the nose 10 ground wheels, i~ shown in US patent publication 3,005,510 In this neighbouring bogie wheels are driven by means of two rriction tracXs, WhiCh are wedged between the two in-line bogie wheel~ ~he hydraulic transmission includes both a direction switch valve and a flow distribution valve, by means o~ which 15 the flow going to the rlght and lert side hydraulic motors can be ad~u~ted The ad~u~tment take~ place by means o~ two r-~trlotion polnt- that are connoet-d to one another, ~o that wh-n th- ono deoreas-~ in ~iz- th- oth-r increa~e~ ~y mean~ o~
thi~ the no~e bogle wheels can be made to turn by restricting 20 th- flow going to th- hydraulic motors on one side at the same tlme a- the re~trictlon on the other slde i8 lessened Thi- invention i~ e~peoially related to such transrer devices in whieh th- transfer tak ~ plae- only from one of the main 25 underearriage bogi-~ ~hi~ in it~-lf i- som thing new, becau~e ln aeoordanoe with th- ~tate o~ th- art th- drive ha- alway~
b--n ymm-trlcal Asymmetrical driv- gives the aircrart a turning fore-, whioh normally i~ of no consequenee as the alreraft can be steered in the deslred direetion by means Or the 30 nose wheels Problems may appear in certain special circumstances In terms of friction conditions an icy and snowy airfield in winter is totally different from a dry asphalt ~urfaoe in summer In addition a ~trong ~ide wind may increase the force turning the aircraft Practical experiments hav- shown 35 that moving an empty alrcrart on a very slu~hy alrfleld is extxemely difficult One tyre of the double wheel may rise by itself to carry in which case the other is able to rotate freely Another phenomenon of the same kind appears on an icy ' ' ~' '' ' .. ~
. ~.~,.'.":'".'~'' ;- 2024~8~ : -3 ' air~ield when one o~ the wheels being driven begin~ to slip on the ice All the hydraulic motors that are connected in the same circuit lose their feed pressure, because the flow leaks through the motors that are driving the slipping wheel Another seriou~
5 disturbance ari~es lf the nose wheels begin to slide laterally Twisting then takes place around the undercarriage beside that being pushed as lt remains in place The intention of this invention i8 to achieve a transmission 10 eystem ~or a transfer device driving double wheels that will creato a ~table push, even though the driving point used is the main undercarriage that is located in a dif~icult position to th- side o~ the centre line of the aircraft The characteristics of the invention appear in the accompanying Patent Claim 1 The 15 main principle o~ the invention is to ~ynchronize the operation o~ the variou~ motor~ and corr-~ponding ~riction rollers This malnly mean~ that th- friction roller~ are locked to the ~ame phas- and p--d o~ rotation I~ one o~ the wheels begin~ to olip, th- ~riction roller o~ the wheel beside it continue~ to 20 drive Thi~ ~ame loo~ing also limit~ ~ide 81ip in the nose whe-l-, because the neighbouring ground wheel~ have to turn at di~-rent rotational speed~
''.: ' ' ~:
Th- ~orm ot application in aocordance with Patent Claim 2 i~ the 25 lmpl--t solution to th- problem o~ creating looking in a hydraulio tran~mi~lon The di~tribution valve~ ~u~t absolutely be pr-o~ure oomp-n~at-d 80 that the ~low i~ not able to esoape through the motor o~ the wheel that i~ rotating ~reely A more r-llable locking operation that the above is achieved by 30 implementing the system in accordance with Patent Claim 3, in which case the synchronization o~ the motors as realized through the op-rating components is considerably more pr-cise than the ~ormer The turning of the device to be moved while it i~ being mov-d i8 made possible by lmplementing th- ~y~tem in accordance 3S with Patent Claim 4 Thls is especially important in connection with a trans~er device equipped with two pumps and entirely separate circuits, but it is also use~ul in connection with hydraulic circuits created with flow distribution valves The .
~ 2024~8~
invention can also be adapted to operation with electri¢
transmi~sion. The control of electric motors i~ most advantageously based on frequency trans~ormer technology and the entire system can be based on diesel-electrlc transmis~ion.
The ~orm o~ application in accordance with Patent Claim 7 makes lt possible for the turning moment created by the one-sided push Or the new method to be cancelled. In addition to the pushing ~orce a turning ~orce is al50 developed by the trans~er device, 10 which cancel~ either entirely or in part the turning ~orce given to the aircraft by the pushing force. A braking device is most easily created in a hydraulic system e,quipped with two pumps by setting the pumps asynchronously, l.e. 80 that the output of the one pump is set to be less than that o~ the other.
In what ~ollows the invention is illustrated with the aid of example~ by re~erence to the accompanying ~igures, which show variou~ ~orms o~ application of the invention.
20 Figur- 1 ~how~ the u~e of the tran~er device in moving an airara~t Figur- 2 shows the transfer device in the operating position seen ~rom above Flgur- 3 how~ the hydraulic transmission sy~tem o~ a trans~er device in accordance with Figure 2 a~ a whematlc diagram Figure 4 shows a flow distribution valve in cross-section Fiqur- S shows another hydraulic transmission oystem a~ a 6chematic diagram In the situation shown in Figure 1 the transfer device 20 is pushing aircraft 1 ~rom the right-hand main undercarriage 21, in which there is a double wheel. The push causes a turning moment around the le~t-hand undercarriage, which moment i~ cancelled by 3S the nos- wheel 22 o~ the aircra~t. Figure 1 includes an arrow showing the pushing ~oroe o~ the tran~fer devic- and a broken line showing the counter moment that arises in one form of application, which cancels the force turning the aircraft. ;;
.-. . . .
5 ! 2 Q ~ ~ ~ 8 ~ ~
, .... :.:..:
During the transfer the aircraft 1 i8 steered by turning the nose wheel 22 in the desired direction.
In Figure 2 only the undercarriage and ground wheels 6 of the S airoraft 1 are shown. The transfer device moves on its own wheels and in addition to them the principal components are friation roller~ 3 and 4, the hydraulic motors 5 that drive them together with gearboxes and power unit, which includes a hydraulic pump unlt driven by a diesel motor.
~oth ground wheels 6 have their own friction rollers 3 and 4, both o~ which are driven by hydraulic motor 5. The front friction motor~ 4 are arranged, in a known manner, to be turned to the sid-, so that the transfer device can mov- around the 15 ground wheels 6 of the aircraft 1. The ~upport o~ the front roller 4 io arranged by mean~ o~ ~liding member 7, which is moved by means o~ hydraulio oylinder 7 and which in ito extreme posltion is also allowed to turn. Figure 2 shows the ~ame stage in pu~hing as Figure 1.
The prlncipal components of the hydraulic transmission sy~tem in Flgure 3 are the pump unit drlven by diesel motor 8, the hydraullc motor- 5, and pre~sur- compen~at-d ~low di~tribution valve~ 10. ~he pump unit includes a high pressure pump 9 and its 25 feed pump and lubricating oil oystem. Changes in direction and g-aring ~ake place by altering the ~troke capacity of the high pre~sure pump 8 and the direction of the flow. The motor~ 5 are divid-d into two qroupo by means of the tlow distribution valves 10. One group drives the right-hand and the other the left-hand 30 ground wheel 6. The ~low distribution valves 10 really only operate in one direction, in the reverse direction they permit a free flow. On account of this two o~ them are requlred, one for each direction.
35 Figure 4 shows the construction of a pressure-compensated ~low distribution valve 10 in detail. The pipe coming from pump 9 is oonneoted to connection 11 and the pipe~ coming ~rom the motor~
5 are connected to connections 12. The principal directions o~
2~2~85 flow are marked with arrows in Figure 4. Pressure compen~ation i9 arranged by the spindle 13, which i~ arranged to be moved.
Reverse flow takes place with practically no obstacle through valves 14. In the sy~tem shown in Figure 3 one ot the steady S ~low valves 10 divides the ~low precisely into two parts and the other collects ~lows to pump 9.
Moro precise synchronization than the above i~ achieved by the two pump system shown in Figure S. In this both of the 10 atorementioned motor groups use their own pump lS. The ~peed of revolution of both is the same and the ad~ustment levers are combined to be turned synchronously in normal conditions. In good conditions valve 19 i~ kept open, 8e that thero i~ no locklng between the right and lett-hand ground wheel~ the 15 alrtleld 1~ lcy or ln windy weathor valve 19 i- clo~ed, when the ynchronous operation of the motors S tries to keep the aircraft tralght. By etting the ad~ustment levers oS the atorementioned pump- lS to ditterent position~ one begins to have a greater output than the other. The motors S in the ¢ircuit with the 20 small-r tlow begin to have a braking etfect. It th- braking olrcuit connects in the ~ituation in Pigure 1, i.e. in the ~ltuation ot the tran~er d-vice pushing trom the right-hand ~id-, to the right-hand ground wh--l 6, the turning moment cr-ated by the pu-hlng torce created by the transter device 20 25 cancel- the moment. This ~ind o~ moment cancellation i~
nec-ssary tor example when moving relatively long types ot airoratt on l¢y air~ield~ and in windy weather.
.. ; :: . -~ . - j,, ;~ ~
~ ' .: ' ~ .` .
:,";".: ' :''.. ':
,''''''~"'~".~"''.'",; '' ''','. ,, ~,~,, ' ,', :'.: :' .~:.': .,.,' . ': .':: , ' ~,,:
',: '~.;' ~' '' ''"'i' ' ' ' -'' ';.. '
Reverse flow takes place with practically no obstacle through valves 14. In the sy~tem shown in Figure 3 one ot the steady S ~low valves 10 divides the ~low precisely into two parts and the other collects ~lows to pump 9.
Moro precise synchronization than the above i~ achieved by the two pump system shown in Figure S. In this both of the 10 atorementioned motor groups use their own pump lS. The ~peed of revolution of both is the same and the ad~ustment levers are combined to be turned synchronously in normal conditions. In good conditions valve 19 i~ kept open, 8e that thero i~ no locklng between the right and lett-hand ground wheel~ the 15 alrtleld 1~ lcy or ln windy weathor valve 19 i- clo~ed, when the ynchronous operation of the motors S tries to keep the aircraft tralght. By etting the ad~ustment levers oS the atorementioned pump- lS to ditterent position~ one begins to have a greater output than the other. The motors S in the ¢ircuit with the 20 small-r tlow begin to have a braking etfect. It th- braking olrcuit connects in the ~ituation in Pigure 1, i.e. in the ~ltuation ot the tran~er d-vice pushing trom the right-hand ~id-, to the right-hand ground wh--l 6, the turning moment cr-ated by the pu-hlng torce created by the transter device 20 25 cancel- the moment. This ~ind o~ moment cancellation i~
nec-ssary tor example when moving relatively long types ot airoratt on l¢y air~ield~ and in windy weather.
.. ; :: . -~ . - j,, ;~ ~
~ ' .: ' ~ .` .
:,";".: ' :''.. ':
,''''''~"'~".~"''.'",; '' ''','. ,, ~,~,, ' ,', :'.: :' .~:.': .,.,' . ': .':: , ' ~,,:
',: '~.;' ~' '' ''"'i' ' ' ' -'' ';.. '
Claims (7)
1. A transmission system for a transfer device gripping a double wheel, which transfer device is intended for moving an aircraft (1) or other wheeled device on a base, which transfer device includes at least two friction rollers (3, 4) and motors (S) to drive them, i e one for each ground wheel (6) of the device (1) to be moved, and a friction roller (3, 4) to be pressed against the ground wheel, compression devices (2) to create the aforementioned compression, and which system a power device (8) and transmission devices to feed the motive power to the motors, characterized in that the system includes devices (10) to feed operating power separately and essentially independently of each other to each of the motors (5) that drive the ground wheel (6).
2. A hydraulic transmission system for a transfer device in accordance with Patent Claim 1, which includes one pump (9), which drives the aforesaid hydraulic motors (5), characterized in that the system includes at least one pressure-compensated flow distribution valve (10), which divides the volumetric flow fed by the pump (9) into two parts, to drive each ground wheel (6) separately in such a way that the use of the corresponding hydraulic motor (5) is not essentially dependent on the load of the motor (5) corresponding to the neighbouring ground wheel (6).
3. A hydraulic transmission system for a transfer device in accordance with Patent Claim 1, characterized in that the system includes two pumps (15) synchronously connected to the same power device, for example a diesel motor (8), one of which drive the motors (5) driving the left-hand ground wheel (6) and correspondingly the other the motors driving the right-hand ground wheel (6).
4. A hydraulic transmission system for a transfer device in accordance with Patent Claims 2 or 3, characterized in that the system includes separate pipe runs (18), equipped with valves (19), which connect the high pressure sides and return sides of the hydraulic circuits (16, 17).
5. An electrical transmission system for a transfer device in accordance with Patent Claim 1, characterized in that the system includes a source of electricity, for example a battery, and at least two motors and current supply devices to operate them.
6. A transmission system in accordance with Patent Claims 2, 3, 4, or 5, which transmission system includes at least two compression rollers to be placed on opposite sides of each ground wheel (6) to be driven and pressing against it, at least one of which, most advantageously all, are friction rollers (3, 4) to drive the ground wheel (6), characterized in that the motors (5) are arranged in two groups with respect to the operating power feed, one of which drives one or more left-hand and the other correspondingly right-hand ground wheels (6).
7. A transmission system for a transfer device in accordance with one of Patent Claims 1 - 6, which transfer device is intended to push an aircraft especially from a double ground wheel or bogie of the main undercarriage, characterized in that the system includes devices to brake at least the outer wheel of one pair of wheels at the same time as at least one of the inner wheels is driven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2024585 CA2024585A1 (en) | 1990-09-04 | 1990-09-04 | Transmission system for a transfer device gripping a double wheel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2024585 CA2024585A1 (en) | 1990-09-04 | 1990-09-04 | Transmission system for a transfer device gripping a double wheel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2024585A1 true CA2024585A1 (en) | 1992-03-05 |
Family
ID=4145890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2024585 Abandoned CA2024585A1 (en) | 1990-09-04 | 1990-09-04 | Transmission system for a transfer device gripping a double wheel |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2024585A1 (en) |
-
1990
- 1990-09-04 CA CA 2024585 patent/CA2024585A1/en not_active Abandoned
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