KLASS INTERNATIONELLSVENSK B 62d63c: PATENT- OCH REGISTRERINGSVERKET Ans. 3535/1958 den 11/! 1958Hiirtill en ritning A SVEDLUND, OREBRO Anordning vid med halvband drivna traktorer och andra motorfordon FOreliggande uppfinning har avseende pa en anordning yid sadana med halyband drivna traktorer och andra motordrivna fordon, vid vilka banden aro lagda endast omkring traktorns drivande bakhjul och bakom framhjulen belagna, upp och ned rorliga mellanhjul, vilka utsattas for tryck saval mot mar-ken som mot banden medelst en tryckfjader for varje mellanhjul.
CLASS INTERNATIONAL SWEDISH B 62d63c: PATENT AND REGISTRATION AGENCY Ans. 3535/1958 on 11 /! 1958According to a drawing A SVEDLUND, OREBRO Device for semi-driven tractors and other motor vehicles and down movable intermediate wheels, which are subjected to pressure both against the ground and against the belts by means of a compression spring for each intermediate wheel.
Andamalet med uppfinningen är att pa ett effektivt satt Overflytta en del av de drivande bakhjulens marktryck till mellanhjulen avensom att halla halybanden sa kraftigt spanda ails lagen, att de bliva i stand all upptaga marktryek aven ntefter den del, som ligger mellan bakhjul och mellanhjul, nagot som aven fir av stor betydelse for att forhindra de drivande bakhjulens sliming relativt halvbanden. The object of the invention is to efficiently transfer some of the ground pressure of the driving rear wheels to the intermediate wheels in addition to keeping the haly belts so strongly tensioned by the law that they are able to absorb all ground pressure even along the part between the rear wheels and the intermediate wheels. which is also of great importance in preventing the sliding of the driving rear wheels relative to the half-tires.
Enligt uppfinningen astadkommes detta ditrigenom, att yarje tryckfjader utgOres av en i en teleskophylsa pa i och for sig kant salt innesluten skruvfjader, att ena anden av teleskophylsan fir svangbart lagrad kring en i en i forhallande till fordonsramen fast hallace anbragt tapp, som am belagen hOgre bakhjulets axel, medan teleskophylsans andra ande fir svangbart forbunden medelst en tapp i ett p mellanlijulets axel vridbart lag-rat taste, varvid denna tapp kr belagen dels narnaare bakhjulets axel an mellanhjulets axel och dels hOgre On denna sistnamnda axel, att delta taste dessutom är forbundet med hallaren genom en i denna och fastet svangbart lagrad lank, som Or lagrad dels i fastet medelst en tapp, belagen hogre On teleskophylsans lagringstapp i fastet men lagre On teleskophylsans lagringstapp i hallaren och dels med hfillaren formedelst en tapp, som Or belagen under och framfor bakhjulets axel, pi sddant satt att mellanhjulets axel i traktorns horisontallage faller i forlangningen av skruvfjaderns framat och nedat lutande centrumaxel, varigenom uppnas att mellanhjulet i traktorns alla 1 praktiken forekommande ar betslagen bibringas ett i huyudsak ofOrandrat tryck saval i riktning nedat som framat, s'a att en del av bakhjulets marktryck Overflyttas till mellanhjulet samtidigt som halvbandet Mlles spant, sO att bakhjulet fOrhindras slim i forhallande till bandet. According to the invention, this is achieved in that each compression spring is constituted by a coil spring enclosed in a telescopic sleeve on a per se edge of salt, that one end of the telescopic sleeve is pivotally mounted around a pin arranged in a hallace fixed in relation to the vehicle frame, which is the axle of the rear wheel, while the second end of the telescopic sleeve is pivotally connected by means of a pin in a shaft rotatably mounted on the shaft of the intermediate wheel, this pin being located closer to the axle of the rear wheel than the axle of the intermediate wheel and to the right of this latter shaft. with the holder through a link pivotally mounted in this and the fastener, which Or is stored partly in the fastener by means of a pin, coated higher On the telescopic sleeve storage pin in the fastener but lower On the telescopic sleeve storage pin in the holder and partly with the filler formed by a pin, which Or coated below and in front rear axle axle, in which case the axle of the intermediate wheel in the horizontal position of the tractor falls in demand one of the helical spring's forward and downward sloping center axles, whereby it is achieved that the intermediate wheel in the tractor's all 1 practice occurs to be given a substantially unchanged pressure sable in the direction downward as forward, so that part of the rear wheel ground pressure is transferred to the intermediate wheel frame, so that the rear wheel is prevented from slipping in relation to the tire.
A bifogade ritning fOrtydligas en utforingsform av uppfinningen i Ire olika arbetslagen. For att icke komplicera ritningen hava endast ctt drivande bakhjul och ett mellanhjul med tillhorande band och den mellan dessa hjul insatta mekanismen utritats, medan frambjulet utelamnats. 1 Or del drivande bakhjulet, 2 mellanhjulet och 3 del omkring dessa bada hjul lagda bandet. The accompanying drawing clarifies an embodiment of the invention in the various working methods. In order not to complicate the drawing, only a driving rear wheel and an intermediate wheel with associated belts and the mechanism inserted between these wheels have been drawn, while the front wheel has been omitted. 1 Or part driving the rear wheel, 2 the middle wheel and 3 part around these two wheels laid the belt.
Bakhj ulet Or lagrat i den fasta fordonsramen 4, som uppbar dels en hallare 5 for skruvfjadern 6 och dels en hallare 7 for Ian-ken 8. Kring mellanhjulets 2 axel 9 Or svanghart lagrat ett faste 10 av, sasom pa ritningen visas, exempelvis triangular form. delta faste Or den i hallaren 7 svangbara Milken vridbart lagrad i en punkt 11, som ligger hOgre On axeln 9. Skruvfjadern 6 är svangbart inspand mellan hallaren 5 och fastet 10 medelst en skruvfjadern omslutande teleskophylsa 12, vars ena ande Or lagrad i hallaren 5 medelst tappen 13, medan hylsans andra ande Or sydngbart lagrad i fastet 10 i en punkt 14 belOgen mellan bakhjulets 1 axel 15 och mellanhjulets 2 axel 9 och lagre On punk-ten 11. Vid kOrning pa plan mark bildar skruvfjaderns 6 langdaxel vinkeln v med lodlinjen. Vid kOrning i ojamn terrang eller da mellanhjulet rullar Over ett hinder (sten, stubbe e. dyl.) blir vinkeln mellan skruvfjaderns langdaxel och lodlinjen nagot stOrre v+b, medan om mellanhjulet vid korning rullar ned i en grop vinkeln blir mindre v—a. Genom samverkan mellan lanken 8, skruvfj adern 6 och del kring mellanhjulets axel 9 syangbara fastet 10 vinnes att vare sig traktorn framfores pa plan mark (fig. 1) eller i ojamn terrang, da mellanhjulet befinner sig 'Ogre (fig. 2), eller lagre (fig. 3) On tangent- 2— — linjen T mellan bakhjulets och det icke visa-de framhjulets markkontaktpunkter, skruvfjadern 6 alltid kommer att paverka mellanhjulets axel med en kraft, vars horisontella, framat riktade komposant saval som den Tertikala nedat riktade komposanten bliva i huvudsak oforandrade i det att skruvfjadern sammantryckes nagot, nar mellanhjulet be-Miner sig ovanfor tangentlinjen T (fig. 2) och darigenom kompenserar fjaderns nagot mindre nedatriktade tryckkraft. Nar mellanhjulet vid horning befinner sig mar eller mindre under tangentlinjen (fig. 3) dvs. nar mellanhjulet sjunkit ned i en grop, blir fjaderns 6 tryekkraft mer nedatriktad an vid korning pa plan mark samtidigt som den forlanges nagot, varigenom aven da en kompensering av den pa fastet 10 och darmed axeln 9 verkande tryckkraften erhalles. The rear wheel Or is mounted in the fixed vehicle frame 4, which carried partly a holder 5 for the coil spring 6 and partly a holder 7 for the Ianken 8. Around the shaft 9 of the intermediate wheel 2 Or a fixed 10 is mounted, as shown in the drawing, for example triangular form. The Milk pivotably mounted in the holder 7 is rotatably mounted in a point 11, which is located on the axis 9. The coil spring 6 is pivotally clamped between the holder 5 and the fastener 10 by means of a telescopic sleeve 12 enclosing the coil spring, one end of which is mounted in the holder 5 by the pin 13, while the other end of the sleeve is pivotally mounted in the fastener 10 at a point 14 located between the shaft 15 of the rear wheel 1 and the shaft 9 of the intermediate wheel 2 and bearing On point 11. When driving on level ground, the long axis of the coil spring 6 forms the angle v with the vertical. When driving in uneven terrain or when the intermediate wheel rolls over an obstacle (stone, stump, etc.), the angle between the long axis of the coil spring and the vertical line becomes slightly larger v + b, while if the intermediate wheel rolls down into a pit the angle becomes smaller v — a . By co-operation between the link 8, the coil spring 6 and the part around the shaft 9 of the intermediate wheel 9, it is possible to drive either the tractor on flat ground (Fig. 1) or in uneven terrain, as the intermediate wheel is located 'Ogre (Fig. 2), or bearings (Fig. 3) On the tangent 2— - line T between the ground contact points of the rear wheel and the front wheel (not shown), the coil spring 6 will always act on the axis of the middle wheel with a force whose horizontal, forward-facing component become substantially unchanged in that the helical spring is compressed slightly when the intermediate wheel moves above the tangent line T (Fig. 2) and thereby compensates for the slightly less downward compressive force of the spring. When the intermediate wheel at the horn is more or less below the tangent line (fig. 3), ie. when the intermediate wheel has sunk into a pit, the compressive force of the spring 6 becomes more downward than when cornering on flat ground at the same time as it is required somewhat, whereby even then a compensation of the compressive force acting on the fixture 10 and thus the shaft 9 is obtained.
Man erhaller pa detta satt en sa gott som konstant bandspanning och en tillfredsstallande overflyttning av en del av bakhjulets marktryck till mellanhjulet i traktorns alla arbetslagen. This results in a virtually constant belt tension and a satisfactory transfer of part of the ground pressure of the rear wheel to the intermediate wheel in all working groups of the tractor.