GB2497561A - Belt drive having subtractive belt tension force vectors - Google Patents

Belt drive having subtractive belt tension force vectors Download PDF

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Publication number
GB2497561A
GB2497561A GB201121485A GB201121485A GB2497561A GB 2497561 A GB2497561 A GB 2497561A GB 201121485 A GB201121485 A GB 201121485A GB 201121485 A GB201121485 A GB 201121485A GB 2497561 A GB2497561 A GB 2497561A
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United Kingdom
Prior art keywords
belt
pulley
drive
idler
belt drive
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Granted
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GB201121485A
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GB2497561B (en
GB201121485D0 (en
Inventor
Andrew Duncombe
John David Calcraft
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Perkins Engines Co Ltd
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Perkins Engines Co Ltd
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Priority to GB201121485A priority Critical patent/GB2497561B/en
Publication of GB201121485D0 publication Critical patent/GB201121485D0/en
Publication of GB2497561A publication Critical patent/GB2497561A/en
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Publication of GB2497561B publication Critical patent/GB2497561B/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/02—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts
    • F16H7/023—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts with belts having a toothed contact surface or regularly spaced bosses or hollows for slipless or nearly slipless meshing with complementary profiled contact surface of a pulley
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members

Abstract

A belt drive comprises a belt (25, fig 1), e.g. a V-belt or V-ribbed belt, a driven pulley 26 and at least idler pulleys 29, 33, 34. The pulleys 26, 29, 33 and 34 are arranged relative to each other so that the belt (25) contacts in sequence idler pulley 29 one side of the drivel pulley 26, the idler pulley 33, an opposing side of the driven pulley and then the idler pulley 34. This arrangement of idler pulleys 26, 29 and 34 results in the belt (25) being held against distinct opposing sides or areas of the driven pulley 26 so that resultant force vectors F12 and F34 of inbound and outbound belt tensions T1-4 of each side/area of contact act in a subtractive manner and reduces a total hub load Fhub. Pulley 29 may drive an alternator 27 and driven pulley 26 may drive a compressor (11) of an air conditioning system (10). Other pulleys may drive a fan or a pump.

Description

BELT DRIVES
recthnical EHe The present; d15Ci.OSUfl relates to a.bei C doive
S rrc
M rcc'flç 1 ocit d in' :flt1urCHlitjttL IrS a means toi: rower transruilcn becween rwo cit mcn:e rotar.tnci sifts. Be It drives ale. used C in a vast: varte: Cv ci anrI ications and are nart icul any cor.ve.rlent for use in ye hides, where tney are tycicailu ch:ive accesso.). es such as t:.ans1 ar.r concti t: .icninq ccinpress.otn. alternators, water pumps power stee.rrn9 pumps anutne. .k..fce.. the::trS aeqenierallu made from endless ii locuts or: aft sxflOe: rnatruial which are:i.ac med round pui. Ins attacheO Coths. rotat:inq shaft. The simplest. form of suc ott rmrnSLttr I S a two. pto. isv susie-rn, but oul 1ev suet ems can b verY cocrtlex and iCciude multiple pulleys.
(flv.5SVna i-.ch ffio hcy of' power tr.ate especial 1 IC when c pared to imdraui it Cr nlrctra.c drives I3tl.t lrives are S ISO r:er'.a.iv nexpt-nsive and run smoothly and cuJ.51117 nod CvD1c5.kIy re nine no iuhnIcatitn so ma.ntsnaOce. Is J,Z:. .t-4- 21: In a belt drive, the be.l C tIer ntis on tT riot 2.ofl bet wee it and the pulley in orde:r CC:. qI:Lr and produc:e torque In nene:ral, tIn length of contact of the belt with t:be pulley will determine the reeist:anc.e.cf the belt to slip-sage on the nulley sc.-the greater the ton.tact the hiciher the resistance,, 33 Other factors include belt width, power draw of the nulL cv.
pre--Csnaion on the bc-It, the belt section type, thbe:lt maCaria 1 make-on * the *f sh of the belt: One
--
4isadvanage nf belt rjve, bewever. lies in thfl the h#1Lza are ptnte to stretching ad t±eref ore at risk tt Uppage.
Sl4pjsafl 10 significant c4ó Cf belt wear ti noise (squealY Elimtrtat$ng 1ippige helps to ituprot t)e S:t&rabi1ity cf the belt,1 Wh±iat' ni&xithisirtg. btlt L1cr1ttact teips ttO MniniiSe *g ti rt*S the. cbi the Mhn the oa4:()nft':,ioad on the. :puflei a.4 t:betbre. the mtn the pulley on the Shat ar the bea± s mounting zhC ttaftt' the componertk U: the belt 1oa4±' Là e:oo high, this ntay Cause premature aiit4re of bearing In wbich one et the rotating shafts is rnoimted. This is a sigiificant failtlte mode of air conditict'iñ tornpresots aia aXxatt';, id.ppaçe. ptA$ThxS c5Sà. hg r4ucé. Ujn. -be1t a4t. ese 4te sw ccwntnly aed itt:pqwtt' tThastinlbfl I S tetns fritts generflly' hy a ape'zcid:i section en4 the palieys wzed therewith S*e ye shaped: o*e> ih'tth that tb V-belt grips ô" the éides o the "oGcfëa rthe3r tfli,, on t.ht bottom as 14 1. fiat be1t aflg4nt.
This wedinçg eftect inCreaseS tM rew.tthr1 thrce I tste4in the pull:ey ithd the belt. &rdthtAs eter power can be' t'n4q' befon the btit:1SPsr F02r appii4ata±S"wlflch reqisLre)itgh power traDsmina& twp or rcre Vbit may b*' S j:OiflEtd se b eide to pr6714e:a t"tiple' V-YJelt hive'.V' IbbE4 bs a* w*tø idW:nYSd:ax4 t4et Sith consist!= aaZ4p.e yea protiZøs ntItie withizi t4tt*nai v'belt,drve siere nøt able rive pulleys from the ha'dk (fiat) side of the belt. this restricttd their use to sils' two or three pulley,&yAterU&
-
i whiqh, each pulley GOflttWt4 the inaide o.f the belt. With the advent ot V-ribbed belle came the ability' ta *ate sex erzflsw ttangementA, with pl4Ueys and aaesor*a being driven from the back sid* cit be:beZt. allowing cqrl:ea S.xra1'i9eiteuts ct &le 4rSeSk these may inctcS the *ase df 14i* pull Y: *idh are Pontet4: Ui USd:O t±aMt eng1ths tflsiQn1ng e 4PLi t the k&Ut, tQ ttWXSt belt wrap:on a dxi.verx çutley. to shortep ati auppottS belt.
spat s S to reduc belt t bntits and to atttr the 1.0 direct o the bait to f41litate another drL.t, pulley.
Róitmt thne is etlU a óänproSa tO b ttde betwee'n n4mtø&ng belt ccirjtact and iniaiiq hbl,*d. jestnt ditjosute ± Ôit.ttd io4r4* fqflhQr ints tiStU4 tehur4gy. -fl
The pmaent dis&ostn tautttGre prtrthes a belt drive ciprtwing. a bei c, a dve puliey and t least Sià ether pulley arvnged relative a h: other so that the belt contt it seq*ence one sidW ot the dritexi tie, the other p4lys) aild an opättfl Side tf the dr yen pilley to provide fle4 of oiit.* ween the bet an the d±iven p11Le. suh tSt the na44ant fo;ce vectns of t!uI1c and cAitbbtkndtblt tffisioz1e e± noh atea at cntat>t a6t Lu subtncltlVe _u_.
The bet L4t{vec f: the dlscWnx* thwr pro-4de a, mens of èit$ifiSitlt teductttcj BSy}mblot hilst maintajr4an acceptable bit sap. This heZS tt fluprove acceS9Ory ttrability and fa illtates use of sin)ler belt drive ac*bec.ries in tight packaging coflattaiflts. -.4
1riet De4ript ion of tj4na FiUz% I 4s a echëtoati, aZ an. exemplary em dinnt of a air cpndSt4pzflng unit Ftgtri: 2 is a perspetir1e1 vie f a atli ansa ection A Vz4ibbd é1t; Is a Frorzt e vaftou t the belt tin ti4nq an air sdttining cattixttssr:uatd in the air awtdit±odIng unit f x 1; Figure 4 is a perspective view at a part oi be belt drive at Figure 3 wiq± S Is a trout eievâtion df a 1iffetéPt section of dksve ct Figure 3 44 6 nd 7 ar diagrams:n tr&dae a S s be1 tp ±ncotpratSn ti addIti:na1 idler.
The pre:sexTh disc1ours Is dire*tted tatds a ett ative cotxrjUi a belt and u1:ie' Athaxi9emerat dn4ch UiE' e used £0.tii t w44ej ar,ety q appltc4ttpns and utay encoçflpafl t large number ø qecmetrical variattons Fot the purpos*% of Sflt:Ititn only, in the ptesent dist,ioure the MIt and pulley tt*flethent will bó 4SóSed with ttfeEit& to an v flprd.ng unit tpr a Mt a4:*' Sri.dieibnitg eyEtéth:tbr a kéhile typ&*fly rnpithsa compressor fl fl4diy GoAfledted c a nnmtlenser 12 b? mans a suitaM hIgh:pteSstre fluid onutt i The bOndiSe Lt2 may inaludé * Uatftienser fatS 14 whi4t is operábiaftz known mannr fla Lasipate heat qiat*4 by the condenser 12. The condenser 12 may be fluidly connected to a driar 15 by means of a suitable high preaeure fluid con4wLt L6. The drtet 15 may be fluidly connected to an eavsiot valve 17 by meañ* ot a further high reSUte fluid conduit U. t:. expana±ón v1n 1 or oter:presn re4utncj 4evi. may have t; 1w pvessu fluid ftntctiana: üth aS aothxits 20 trd. 2i to the inlet ai ouUe: Vapnt* IS flje i1 $Y tLta1fl have tan a connected thereto wlzicii operat:ea b: , known raarth td dirE 1t air ar&w4 the eI a of thevapntat 29.
The EpènEithi. valve 17 Siy A further out:Vt fluidly conre;Spg it to the compreaaGr 1:1, far exan1e y means of 1ot pressure coduLt 23.
t:n øperat Ian the cgntprsssr lz t.y e 4ri4ea t ptmp rófrierazt arowid the eystsm *Lèh preesiae tef4geras4i aa t nay be fed fran the coupressor 11 tb the condenser 12. whtdh ctcndeuse th gas sq Mgb nQnPe: u4td4 4àWft th bndnaet12 atd passs:irStit L*tci thit let øS th 1rtô thi e$pñion iMps Li. Thts tanSIon talte t7'they qo'tp, the:te1.ae or ØPat$tofl. cIf the high xnsui 21) eornprneS rerigraqt IITqu44 rece.tyd f rpm, the drJ.4r 5 Into the éVapotator 19. The aIr Pumped aromd the ccitla of the evapartitor IS by the xi 22 may be then dit&tbd into tha vehicle' cabin as cpolM air. :*s the low k*We: :34'uid eaptntès: in the evapcirattz' t1 the reu1tLrtg iw pteaure gasSy tted th neiatt valte 17 b±Otê being :tsaaed back to 4'!. cäxssr tj, 4th b:è recøjnprénéd.
A bett jri,re may b used tc,&'Isre tht cømpressnr: arid oth!,t 4 sddês of the hi±1A S!=jitie, as hGwth 12± ?turee iD -5 ihe aitr co.uutLcnirr.T compressor Ii may eom.ur.t as a afield e shaft (not shown on. which Is rnounteri (typic-all by means of a b-ear Lee) a cmpresscr pl1l..Iey 25 The vehicle erunine tyjncoihy also has an alternator 27 which ma also S ccsnorl.se a shaft 28 cn which is mounted an di. ternaror ti:IJ.. a.
2$ The air cc ditlcmnir:q fan 22 may also cnr4anse: & shaft. 30 On nrch I_S mounted. the fan pulley 3 The engine ttlay further t soaslv have a oranksha±t cit lyon by the ei:itic, on which a crankehaf. oulleY not. shown) is aunted.
A belt: $b may be wrapped a:000nd the compressor on I Icy 26. the tiltoniato:: ulley 2, the fan oud Icr:31 and t-..he cn:n:kehaft. nuil let. The oranksaf:t ruiN sy ne&v transmit. mat on to the belt 25 n1d the beT.fi 2: Sin turn ro: totes: the other bullcyb 26, 29, and 3d The teit drive may further comphise a means for tenaioniln the hal::-5 as a belt: Lensitaler 32 which ensures ar:adunEta ciuoct i tk:i.ntained between the beiN. 25 2 0 antI each pul lay To the belt drive of the present disclosure there may auldi:oe. provided two itler zLlleys iN:34 a'he b1r be a flat belt, a v.be.jt, a tuane belt (see.F.ilqura 2) or a self tensioned V-ribt:eu.t belt known ass. stretch-i ocr erastic belt: The belt may also be a cect (t md no) belt or a chain oe.l.t. in the case of a ribbed belt:, it tat have any ehnber of ribs. However the 3) hioher the ntumoer of nba, the wider the belt, and this puts riait. i<v al load 011 tile Sfl&tU c the bearmnqs in wiul oh the a.te tic) untied The autxt of belt trp Cii:any given puflé.. together with th: tension in t'he I,iM sCtion of.béit 5 ad the *tzena,ton tn fl mjtbound belt as, results. it a lcd. cm that ptUSey.. the teasi'n;in tiLe inbound eetit'it cf belt 2S S a fuinio of belt pie-ttnsthd tfl),t th't tf C<**Qi** in tbi dfl$. Ti teMjøxt:Iz sestiin ce, the belt 2S' is. tatton of the por' dnw of the *cceSsoi'y' that the gi'lly 13 drivth', piu the ibtt ttzàion+ The belt wrap is the distance iiazg the cirt-untlanmce cif the puIljy, expressed in degrec1⁄4a which the belt tbut±ea. ISO" .belt Wrap resilts in the Fugheat posThó &ib io,4 cc a dflvip. j&'øty.
rn a,trditiovial aiig1e poirjt ozftatt belt wa the lelt ?4t* Is bft. tèatA"E than r.4 4' tvotil4 thènt6ri povtS vtiy high resvitav* 1oa:OU the pi4'ty as eM tt,ttit vetcrS Th the. it'bath fld outhoaS settions of the belt Afl,additicke. Th* sU*t 01 the téflSibn vttot in the 2O jnboun sectiofl o belt 25 áv4ibe tSnsicn vettor in the buebound aebtion of' belt 25, whith at in a very sitniiar di'recftibn, produces a i'4ifltI:ant thtta (hub haS:s)' on the;;i1y' fl.
in the: bl:t' drtve' cnt44iAttiUr1 cf the ".resem 4ivIoaure all SCir' pulley fl is iftd td: alit thObit wtàp so that, he b4t fl ias twC d.,flSit pThta f cØ4 with the conreasov puiley''6 tas Figuns S, 6i * the belt 2S: :StS over one idt St the tonreasor puflay U with a tiibh smaller belt wrap, *d then around tI* ti,tst Idler pu1ey 33 (see Figure, j.. The second idler "pulley 34 is locate4, relati'qe to the tir,st idler pulley 33 and the compressor puXley 26 to hold the belt 25 against the oppoSth sid qi th ooznprnssr u1ley 2, a9áth tth smaller be P. before the belt rop8 the idler pufliy 44 rØ then oat-a S puUey ft t c tact is creates betwes tft :lk)ei!; 2$ tkø t* cP Sx lfl Mid ti'* M4t pa** are ç,reatS, Thi.a Fag the eflct of cthanging the nctot aad tuagtLnLde the teAsion oit be. b1t. As can he an frotn Fiie 7 the resultaat tni± vectors (Z,t) do àcft I C in a s±siler direct ion, but *flsad act in a subtraet ive maimer tbereby significantly xedxcing th resultant hubiqad W3 o óraë side of the pte 26. Additianal. textS itt conipor cuts It3. Z) ce:in A Subtflctive inanher to pthvide n pcS4ig hub lo4 frJ to the other si4e GE the pUey tS 26a tieh:ine4ng that thé totall. rsautttit. hc load Is 2 øn!41. and *t.bi-ó *lâo the 1d ou flie bèari i.
whZh Sø tncressor itey *att is mounte4..
Xlthoth the irrOVbd belt dtive has be* dectibed as utiiizArtt tw idZr.pufltY., :4, it should t'e: a6ted that ozily one stiley, wbSch may 1* a idler pulley, a driven pulley or another pulley, IS:ratruired to provide this effet at,Zy,d1er puJ.1y:33,, *bich, is usea t Split th belt wrap arqn4 the:cornpZeSO pUt3y 26. 44i*4qnat i4ie zs su1iey::34q 2$ Thay be tad as ±iLUsttatd, t* 7, otIet dtive q*é4fl taefl. ty a S4 than idler pz4leya or a 4atQa of td%er nd t1$ pulThys\ caøantly the duttbt.tity of the cbmp*at 11 is itprove4 and may provide tot cost saving and/or rst&cing the size at th beariag. This anapgement ailow the belt 25 to cone irzto contact with the pulley 2.6 at tSt %b tS,, whith (when taed wi t.h s system utii.i sing a tnie: p'c4&z p conta±t *tth a Sail degree of:bit %crap increases *ae capaiiay the pWL.Ley 26 t transtflt 4crque S itStt 4ttppLri, whilst atittg th inhflnt irieas £h hub load aeticiatid ditb cdttiimt,S flt *4:. tbiO Ue oppgrtunity t iyça:se:bel £rttSc:4 hena poWr oa:pAbi1iti by tncvnsftg the nutr f e1t rth, .witüt sinificantiy icré4sing hub it'n Oft the driven putleys and accssozLea fl tp il1uatt*d itt fluTh B is spil cae the ?t UP lua6rated j: tSglkre t where no *Wjr is 4t4qi tfln tht actessGry, this cai 1mn, for satnpLe in H dSet äf M Mt dIMdi[tThhthg mt*Ssor, where the ar *p1:i±ptzii9 IS Siqh?d ofl. iith the Màn n(rikSed iikG thia, tens4anttss ticj ia c1 1öd ($) ks zero.
r4$_Applicahi lit' The b&Lt drive of the pre$tnxt thsq1bMur ha
app1icattA Th vets-many dif:ftent fields and is
partisu1a;]y cnvrzieut ifl in rnathines, ahi1S,, tOy dri&iac:stt cgrnpressoz,, cot ressor pumps, *fana, 2S altekttatttti, Water pQpS, Sin pançis aS the 124ke..

Claims (3)

  1. <claim-text>CLAIMSI * A. belt drive cornpriStqç a!t dri'ALpuflt arid at least:cne ctInpui1ey anange4 nlat.ive to ncth Qt*Ci' :5 that the belt cotttaet* th eetje.nce ne skde ct th, :dflvtti uflfl th.*hèx p1:aiyt& nd an ppoaq side ot drivea pui2ey tprofldi tw*. *± COtt4:t bein ø belt ann tiw dflven pul]Ley, .øath that the resu1att frjej M iithbund atd outibthUxid belt tensions ø eaéh area of contact ct in a eubtriàtiye yranner.</claim-text> <claim-text>2. A btit thsvs as tltunea lb claint I tn whidh the belt &s a 13 a. A belt drive: as ii4Uttte: in táim 2 Sit tdtt:the belt is 0 v-tIbtiS. be1t 4.. A tát drive as c]sdsie4 h2 arty one t tht: c1iS in stthh the otht ptkiie ±s an idler fley. :2 Q5. a btat dril'e as clainteiLin Qlalnt 4. turthi ctprising an tddit±*tai idler pulley.6 * belt 4z$x as craii$4 Inatiy one o th précèdiig iaIw itt Whith the n least ot aher ptey Is moant*a tc.!= 421. :tttLtOt S n sr a ump.7. k bt drtyn as iiae4 in any one at the, pra.c,e4ig cifl$a th:*tcb the at least: oft ther pulley omprtse a cowttp., of at ieaøt oh* idler pulley ana t least one other Sr&ven pui1ey Amendments to the claims have been filed as followsCLAIMS1. A belt drive comprising a belt, a driven pulley, an idler pulley and at least one other pulley arranged relative to each other so that the belt contacts in sequence one side of the driven pulley, the idler pulley and an opposing side of the driven pulley to provide two distinct areas of contact between the belt and the driven pulley, such that resultant force vectors of inbound and outbound belt tensions of each area of contact act in a subtractive manner.
  2. 2. A belt drive as claimed in claim 1 in which the belt is 0') a V-belt.0')
  3. 3. A belt drive as claimed in claim 2 in which the belt is a V-ribbed belt. C)4. A belt drive as claimed in any one of the preceding claims in whIch the other pulley Is an idler pulley.5. A belt drive as claImed in claim 4 further comprising an additional idler pulley.6. A belt drive as claImed in any one of the preceding claims in which the at least one other pulley is mounted to one of an alternator, a fan or a pump.7. A belt drive as claimed in any one of the preceding claims in which the at least one other pulley comprises a combination of at least one idler pulley and at least one other driven pulley.</claim-text>
GB201121485A 2011-12-14 2011-12-14 Belt drives Expired - Fee Related GB2497561B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021111669A1 (en) 2021-05-05 2022-11-10 Arntz Beteiligungs Gmbh & Co. Kg Belt driven ventilation system and method of operating the same

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GB1450904A (en) * 1971-10-09 1976-09-29 Philpott Arthur Transmission unit
JPH08152050A (en) * 1994-11-29 1996-06-11 Canon Inc Timing belt reduction mechanism
EP0893622A1 (en) * 1997-07-23 1999-01-27 MASCHINENFABRIK REINHAUSEN GmbH Gearbox for a motor-drive
GB2332259A (en) * 1997-10-14 1999-06-16 Tsubakimoto Chain Co Tensioner guide
US6053832A (en) * 1997-09-27 2000-04-25 Ricoh Company, Ltd. Belt driving device having a belt shift correcting member
WO2000047914A1 (en) * 1999-02-10 2000-08-17 Cloyes Gear And Products, Inc. Chain tensioner device for use in a confined space
DE19955894C1 (en) * 1999-11-20 2001-01-11 Daimler Chrysler Ag IC engine has guide for drive chain between crankshaft and camshaft provided integral with cover enclosing space containing drive chain
US20040206323A1 (en) * 2003-04-17 2004-10-21 Tadashi Shintani Camshaft drive for engine
US20050187054A1 (en) * 2001-11-27 2005-08-25 Witold Gajewski Synchronous drive apparatus and methods
US20050282670A1 (en) * 2004-06-18 2005-12-22 Kim Heon K Pulley cover assembly for motorcycle transmission
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Publication number Priority date Publication date Assignee Title
US3777577A (en) * 1971-04-15 1973-12-11 G Giacomello System of mechanical coupling for piloting rotative transducers
GB1450904A (en) * 1971-10-09 1976-09-29 Philpott Arthur Transmission unit
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GB201121485D0 (en) 2012-01-25

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