SE201280C1

SE201280C1 -

Info

Publication number: SE201280C1
Authority: SE
Publication date: 1965-01-01

Description

Uppfinnare: F G de Brie Perry Prioritet begard fain den 19 augusti 1959 (Storbritannien) Foreliggande uppfinning avser en steglost variabel vaxel av friktionstyp med koaxiella torusskivor och svangbara rullar, vilka styras medelst en central kamskiva over vippor, som aro forbundna med de svangbara rullarna och aro svangbara kring en axel hos ett reaktionselement pa sä satt, att em utjamning .av alla de svangbara rullarnas vridmoment sker genom vippriktningen, vridmomentreaktifonen och vippornas styrning i kamskivan. Inventor: FG de Brie Perry Priority requested on 19 August 1959 (Great Britain). pivotable about an axis of a reaction element in such a way that the torque of all the pivotable rollers is smoothed by the rocking direction, the torque reactive and the control of the rockers in the cam disc.

Del liar i praktiken visat sig, att sa.dana vaxlar ej aro speciellt ekonomiska, eftersom en likformig vridmomentbelastning hos alla rullarna endast är mojlig genom en myeket omsorgsfull framstallning av samtliga delar och exakt sammansattning, varvid det aven darvid offta visat sig nadva.ndigt, att andra vaxelns utvaxlingsf&rhallande for att vaxeln skall kunna arbeta utan att skadas, nar vridmomentjamvikt lawn snava granser ej rader, vilket alltid 'nage ta.gas med i berakningen. It has been found in practice that such gears are not particularly economical, since a uniform torque load on all the rollers is only possible through a very careful representation of all the parts and exact composition, whereby it has also often proved necessary, that the gear ratio of the second gear so that the gear can work without being damaged when the torque balance lawn narrow boundaries do not line up, which is always' nage taken into account.

Det har visat sig, att de tidigare forefintliga ovan i korthet behandlade nackdelarna framfor alit harstarnma frail att .gangen fix oregelbunden resp. att vippstyrnin.gen, speciellt kamskivan hoppar. It has been found that the previously existing disadvantages, which have been briefly discussed above, rather than have been the case, are that the course of fixation is irregular resp. that the rocker guide, especially the cam disc jumps.

Uppfininngen undanrojer dessa nackdelar och upphaver darigenom den daliga driftsekonomin hos vaxlar av det angivna slaget i huvudsak darigenom att varje vippa är f5rsedd med en riled radiellt spel I ett kamspar hos kamskivan inskjutande vipparm saint att minstone ett av kamsparen upptager en styrkropp, vilken är forskjutbar axiellt i forhallande till kamsparet och vridbar kring dettas axel, men sdkrad mot relativriirelse i fOrhallande till kamskivan vinkelratt mot kamspirets axel, samt att dessutom vipparmens i kam sparet belagna ande genom en fjaderring under friktion anligger i styrkroppen. The invention obviates these disadvantages and thereby obviates the poor operating economy of gears of the type indicated mainly in that each rocker is provided with a riled radial play in a cam pair of the cam plate projecting rocker arm so that at least one of the cam pairs receives a guide body which is displaceable in relation to the cam pair and rotatable about its axis, but secured against relativity in relation to the cam disc perpendicular to the axis of the cam sprocket, and that in addition the rocker arm in the cam pair is retained by a spring ring under friction abutting in the guide body.

Enligt en vidareutveckling av uppfinningstanken är vipparmens ande belagen i en borrfling i styrkroppen och en fjaderring Or pa sâ satt anordnad mellan vipparmen och styrkroppen, att fjadern under tryck dr inspand melIan vipparmen och borrningens vagg. According to a further development of the inventive idea, the spirit of the rocker arm is enclosed in a bore flap in the guide body and a spring ring.

For att Oka rorligheten nrellan vipparmen och styrkroppen stracker sig .enligt ytterligare en utveckling av uppfinningen en del av vipparmen in i styrkroppens cylindriska borrming och uppvisar partier med mindre diameter, sa att vipparmen och styrkroppen Oro svangbara i fOrhallande till varandra atminstone i en riktning. In order to increase the mobility between the rocker arm and the guide body, according to a further development of the invention, a part of the rocker arm extends into the cylindrical bore of the guide body and has smaller diameter portions, so that the rocker arm and the guide body are pivotable relative to each other at least in one direction.

Dessutom kan: vaxeln vara sO. utformad, att styrkroppen tillsammans med vipparmen Or rorlig i forhallande till kamskivan och en fjader är anordnad mellan styrkroppen och kamskivan, vilken fjader ãr belagen i ett periferiellt spar i styrkroppen och omsluter derma. Denim fjader motverkar en relativt mdell mellan vipparmen och kamskivan. In addition: the gear can be sO. designed, that the guide body together with the rocker arm Or movable in relation to the cam disc and a spring is arranged between the guide body and the cam disc, which spring is coated in a peripheral groove in the guide body and encloses it. Denim spring counteracts a relative model between the rocker arm and the cam disc.

Dessutom kan styrkroppen vara cylindrisk och passa in i det likaledes eylindriska kamsparet. In addition, the guide body can be cylindrical and fit into the similarly cylindrical cam pair.

Fordelen med vaxeln enligt uppfinningen ligger ddri, att varje oregelbundenhet i gingen resp. varje hoppande av vippstyrningen forhindras resp. dampas I sh stor utstrackning, att det ej verkar storande, nar vippstyrnin.gen automatiskt installer sig fOr att utjamna det vridmoment, som Overfores till vaxeln genom rullarna. Vid na.gra utf8ringsformer kan delta resultat med avseende pa friktionen aven astadkommas vid radiell r5relse hos vipparmen. Vid vaxlar med mitt fOr varandra belag- 2 na rullar 1mm det salunda vara tilJrâekligt all endast .alstra en extra friktionskraft mellan den ena vipparmen och kamskivan genom att en fjader inbygg:es f8r detta andamal. Pa bifogade ritning visas ett utforingsexempel av uppfinningen. Harvid visar fig. 1 en sektion genom en vaxel enligt uppfinningen under det abt fig. 2 ar en vy av vissa i vaxeln enligt fig. 1 inghende detaljer. Fig. 3 ar en sektion genom anden. av en vipparm under det att fig. 4 ar en sektion utefter 4 4 i fig. 3. Fig. 5 är en sektion utefter linjen 5-5 i fig. 2. Fig. 6 och 7 aro sektioner utefter linj en 6-6 i fig. 2 och visa tva olika utforanden av en defalj under det att fig. 8 pa samma salt som fig. 3 visar en sektioa genom ett modifierat utforande av vipparmsanden. The advantage of the gear according to the invention lies in the fact that each irregularity in the gear resp. each jump of the rocker control is prevented resp. is dampened to such an extent that it does not appear to be disturbing when the rocker control automatically installs itself to equalize the torque which is transmitted to the gear through the rollers. In some embodiments, participating results with respect to the friction can also be achieved by radial movement of the rocker arm. In the case of gears with centered 1 mm rollers, it will thus be sufficient to only generate an extra frictional force between one rocker arm and the cam disc by incorporating a spring for this purpose. An accompanying embodiment of the invention is shown in the accompanying drawing. In this case, Fig. 1 shows a section through a gear according to the invention, while Fig. 2 is a view of certain details contained in the gear according to Fig. 1. Fig. 3 is a section through the spirit. of a rocker arm while Fig. 4 is a section along the line 4 in Fig. 3. Fig. 5 is a section along the line 5-5 in Fig. 2. Figs. 6 and 7 are sections along line a 6-6 in Figs. Fig. 2 and show two different embodiments of a defile while Fig. 8 on the same salt as Fig. 3 shows a section through a modified embodiment of the rocker arm sand.

Den pa ritningen visade vaxeln bestar av tvh mat varandra Arida torusskivor 45, som aro fasta pa och drivas av en drivaxel 25. 1V1ellan skivorna 45 ar anbragt en dubbelsidig torusskiva 47, som over en trumma 48 är forbunden med en utgaende axel 49. I de bildade, torusforraiga utrymmena mellan skivorna aro anordnade tva satser av rullar 51 med rulhallare 53 saint vippanordningar fOr dessa. Vardera satsen bestar av tre rullar, som med 10 vinkelavstand ire fordelade runt en axel, som i huvudsak sammanfaller med drivaxelns geometriska axel. The gear shown in the drawing consists of two adjacent Arida torus discs 45, which are fixed to and driven by a drive shaft 25. Between the discs 45 is arranged a double-sided torus disc 47, which over a drum 48 is connected to an output shaft 49. In the formed, torusforraiga spaces between the discs aro arranged two sets of rollers 51 with roller holders 53 saint tilting devices for these. Each set consists of three rollers, which at an angular distance ire are distributed around an axis which substantially coincide with the geometric axis of the drive shaft.

I ett reaktionsmoment upptagande element 52 i vaxeln arc svangbart lagrade vippor 21, vilka aro utformade med armar 22, som stracka sig in i spar i en kern 23, vilken fir anardnad pa. en hylsa: 24, som omsluter drivaxeln 25 med radiellt spel och liar begransad axiell och radiell rorelsefrihet relativt drivaxeln. In a torque receiving element 52 in the gear arc pivotally mounted rockers 21, which are formed with arms 22, which extend into grooves in a core 23, which is arranged on. a sleeve: 24, which encloses the drive shaft 25 with radial play and has limited axial and radial freedom of movement relative to the drive shaft.

I varje kamspar 26 fir anbragt ett styrorgan 27, som fir utfort med en urbarrning 28, vii-ken stracker sig tvars mot kamsparets 26 axel. linden 29 av varje vipparm 22 fir infOrd i urborrningen' 28 i ett styrorgan 27. Arranged in each cam pair 26 is a guide member 27, which is formed with a bore 28, which extends transversely to the axis of the cam pair 26. the winding 29 of each rocker arm 22 is inserted into the bore 28 in a guide member 27.

Kamsparen 26 aro cirkelformiga i sektion vinkelratt mot axlarna, dvs. den riktning, i vilka sparen stracka sig, och styrorganen 27 are cylindriska och passa i sparen 26. Vardera styrorganet 27 liar ett runtgaende spar 31, sam &tracker sig runt organet frail andarna av urborrningen, .och i det runtgaende sparet 31 ar inlagd en C-formad, korrugerad fja.der 32, som onasluter styrorganet 27 men lamnar den mot sparets oppning va:nda anden av urborrningen frilagd. The cam pairs 26 are circular in section perpendicular to the axes, i.e. the direction in which the grooves extend, and the guide means 27 are cylindrical and fit in the groove 26. Each guide member 27 forms a circumferential groove 31, contracts around the member from the ends of the bore, and in the circumferential groove 31 a C is inserted. -shaped, corrugated spring 32, which unlocks the guide member 27 but leaves it against the opening of the spar when the spirit of the bore is exposed.

Hojden hos fjaderns korrugeringar ar sadan, att korrugeringarnas toppar i fjaderns ospanda tillsta.nd skjuta ut utanfor styrorganets yta. Fjadern maste salunda spannas fOr att kunna infOras i kamsparet, i vilket den kommer att vara hoptryckt mellan styrorganet 27 och kamsparets 28 vagg 33, varigenom den ger upphov till friktion, d kammen 23 rOr sig relativt styrorganet 27. The height of the spring corrugations is such that the peaks of the corrugations in the unstressed state of the spring project beyond the surface of the guide member. The spring must thus be tensioned in order to be able to be inserted into the cam pair, in which it will be compressed between the guide member 27 and the cradle 33 of the cam pair 28, whereby it gives rise to friction, as the cam 23 moves relative to the guide member 27.

Vipparmsanden 29, sour ar inford i urborrningen 28 1 styrorganet, ar utformad med en cylindrisk styryta 34 vid det yttersta andpartiet samt med ett spar 35, som begransas av den namnda styrytan 34 och vipparmsskaftet 36. Detta sistnamnda fir profilerat, sh att det ar elliptiskt i tvarsektion, och styrytan 34 ar sa dirnensionerad, att vipparmsa.nden kan sn.edstallas relativt styrorganet i riktningen av ellipsens lillaxel. I sparet 35 i vipparmen ar anbragt en korrugerad fjaderring 37, och korrugeringarnas hiijd fir sadan, att korrugeringarnas topper skjuta ut utanfOr den cylindriska styrytan, da. fjadern ar ospand. Da vipparmen ar infOrd i urborrningen 28 i styrorganet kommer fjadern 37 aft vara hoptryckt Indian vipparmen och vaggen i urborrningen och darigenom ge upphov till friktion, cm vipparmen rar sig relativt styrorganet langs urborrningen. The rocker arm sand 29, sour inserted into the bore 28 in the guide member, is formed with a cylindrical guide surface 34 at the outermost end portion and with a groove 35, which is delimited by the said guide surface 34 and the rocker arm shaft 36. The latter is profiled, so that it is elliptical in cross section, and the guide surface 34 is so dimensioned that the rocker arm end can be inclined relative to the guide member in the direction of the small axis of the ellipse. A corrugated spring ring 37 is arranged in the groove 35 in the rocker arm, and the height of the corrugations is such that the tops of the corrugations protrude beyond the cylindrical guide surface, then. fjadern ar ospand. When the rocker arm is inserted into the bore 28 in the guide member, the spring 37 will again be compressed by the Indian rocker arm and the cradle in the bore and thereby give rise to friction, since the rocker arm moves relative to the guide member along the bore.

Uppfinuingen medfor bland annat, att den av fjaderelementea astadkomna friktionen dampar .eventuella tendenser till svaagning, dä vippanordningen staller om sig for utjfimning av det av rullarna i den kontinuerligt variabla vaxeln overforda momentet. Vid vissa utf&anden kan man uppna tillfredsstallande resultat genom att astadkomma friktion, vipparmen: rOr sig radiellt relativt kammen, och man torde inse, att exempelvis vid vaxlar med diametralt belagna ruilar det kan vara tillräckligt att astadkomma friktioa mellan endast em vipparm och kammen. The invention entails, among other things, that the friction produced by the spring elements dampens any tendency to weaken, when the tilting device is turned over to compensate for the moment of the rollers in the continuously variable gear. In some embodiments satisfactory results can be obtained by creating friction, the rocker arm: moves radially relative to the cam, and it will be appreciated that, for example, in gears with diametrically coated exchanges it may be sufficient to create friction between only the rocker arm and the cam.

Typen av fjadrar och det material, av vilka dessa aro utforda, skall valjas under hansynstagande till driftsfOrhallandena. Om vaxeln exempelvis Riper i olja ãr det lampligt, att fjadrarna utgoras av metallfjadrar. Om det daremot icke foreligger flagon risk for att (rija skall nh fjfiderelementen kunna dessa utforas i form av o-ringar av gummi. mom uppfinningens ram kan man tanka sig ett flertal modifikationer. Tva. Adana visas ph ritningen. Vid utfOrandet enligt fig. 7 Or urtagningien for fjadern 31, som omsluter styrorganet 27, utformad i kammen 23 i stallet for i styrorganet. The type of springs and the material from which they are to be challenged shall be selected taking into account the operating conditions. If the gear, for example, scratches in oil, it is appropriate for the springs to consist of metal springs. If, on the other hand, there is no risk that the fhider elements may be made in the form of rubber rings. According to the scope of the invention, a number of modifications may be considered. Two. Adana is shown in the drawing. In the embodiment according to Fig. 7 The recess for the spring 31, which encloses the guide means 27, formed in the cam 23 in the stable for in the guide means.

Sasom ovan papekats kan fjaderns form valjas sa att den bast passar for den tjanst den her att Ora. Vid sma vaxlar kan det exempelvis vara tiilrackligt att anvanda en .enkel fjaderring 41 enligt fig. 8 i stallet far de oven beskrivna korrugerade fjadrarna. As above papekats, the shape of the feather can be chosen so that it is best suited for the service this one to Ora. For small gears, for example, it may be sufficient to use a simple spring ring 41 according to Fig. 8 instead of the corrugated springs described above.

Claims

Patent claim:

Stepless variable gear of friction type with coaxial torus discs and pivotable rollers, which are guided by means of a central cam disc over rockers, which are connected to the pivotable rollers and are pivotable about an axis of a reaction element in such a way that a smoothing of all the torque of the pivotable rollers takes place by the direction of rocking, the torque reaction and the control of the rockers in the cam disc, characterized in that each rocker (21) is provided with a rocker arm (22) projecting with radial play in a cam pair (26) and that at least one of the cam pairs (26) receives a guide body (27), which is displaceable axially in relation to the cam pair and rotatable about its axis, but secured against relative movement in relation to the cam disc perpendicular to the cam pair axis, sand to also the rocker arm in the cam pair. duct coated (36) through a spring ring (37) under friction abuts in the steering body.

Gear unit according to claim 1, characterized in that the spirit of the rocker arm (22) extends into a band (28) in the guide body (27) and that a spring ring (37) is arranged between the rocker arm and the guide body, which flattening under pressure is clamped between the rocker arm and the steering body.

Gear unit according to claim 2, characterized in that the spring ring (37). located in a peripheral groove (35) of the rocker arm.

Gear unit according to claim 2, characterized in that a part of the rocker arm (22) extends into the cylindrical bore (28) of the guide body (27) and has portions with a smaller diameter than this, sa. that the rocker arm (22) and the guide body (27) are pivotable in relation to each other generally in at least one direction.

Gear unit according to claim 4, characterized in that the guide body (27) together with the rocker arm (22) are movable in relation to the cam disc (23) so that a spring (32), which is accommodated in, a peripheral groove in the guide body and encloses derma, dr fitted between the guide body and the cam disc (23).

Gear unit according to claims 1-5, characterized in that the cam pair (26) and the guide body (27) are cylindrical and fit into each other. Request publications: Patents frcin Germany 1 007 590; USA 2850 911.