This invention relates to i gear iifti| anhvia for aatoaotive syachreaeah traasaissioa
This iavcatiea relates to the atonal gnr ii aNhaia of a 5 speed
with oae shiftar
dog for die purpose of gear akiftkg. The shifter dog m ased to swivel a ■liter fork sbeat two piai fixed a the koasiag. The two pia« defiae the swhrafiag axis for the duller folk.
Aeeordiag to the kaowa art* the traaaaiaaiea systea ia a vehicle aeHipliw the eagiae torque accordaace with the geer aad sappties it to the wheels. A typical 5 speed syachroaesh traassiissioB has S forward gear peirt aid oae reverse gear pair.
The drive sad drivea gears are ia eoastoat aesh for all the gear pairs, oae of the two rotstag aloag with the shaft oa which it is aoaated while the other is freely rotatag over its shaft To seleet a partieaiar speed gear, the freely rotatiag gear is aade to rotate with its shaft asiag a lyaefcropack. The gear shift is aotoatod by die driver tooa^i external gear shift aechaaisa sad prooeeds via atonal gear shift aoahaaisa throagh the syaehropaok. The shifter shafts aad tie shifter folks are the parts of the iatanal gear shift aoahaaisai.
Tke a^or drawback of Ike kaowa it ia ik Iftke diataee between tka
^ „f *** fc* fcCTMSM. S*C. A. «fc titer folk acta aa aa evetkaag beaa. aa Aa leagtk iaoreaaea beadiag atvaaa aa tke folk iacreeeea, wkiok aay lead to crackiag of tke skitter fork. Tkia decreeeea tkefotigae life of tke akffier folk.
A preventive aeesare for tke above pfoklsa '» to iaprove tke fatfgao life oi tke Aider folks by decceanag tke aaxiana beadiag aioaieat tke fork ia •objected to dariag skiftiag. Tkia ean be acooapliaked by awiveMag tke skifter fork aboat aa
axia defined by Ike two pivot piaa ia die caaiag.
Tkia invention will «ow be deaaribed wilk refereaee to tke aaooapaayiag
drawings wkiok illaatrate by way of exaaple aad aot by way of Haitatioa
oae of varieaa poaafele eabodiaents of tka iaveatioa, wherein
Fig. 1 illustrates tke geaeral layout of tke eabodiaeat
Fig. 2 illBBtratos shifter skaft fastened to akiftar dogasing a spring pie
Fig,) illustrates tke details of a skifter fork aseeably
Fig. 4 illustrates shifting of 5*Areverse gear
Fig. 5 illustrates die shiftiag of \*tl* apeed gear*
Fig.* illastratos the shiftiag of 3-/4lk speed gears
... , ?
The eabodiaeat consists of 3 shifter shafts SI S2 S3. Ovor each shifter shaft is faateaed a shifter dog aaiag spriag (Fig.2). Thas, ia att, thacoara 3 shifter dogs D1 D2 and D3. Eaoh shifter dog is also gaided by a shifter shaft othar thaa the shaft it ia aioaatod oa. There are 3 shiftar forit asseablies F1F2 aad F3 (Fig.3). £aeh ahiftar fork aaaeaibly has a aaia sheet sietal body F. oae fork pa FP two shift padsSP aad two borea PV1 sadPV2 in whiah the pas fixed to die easiag go. Theae piai aat aa the pivot sad heace the axis of the borea PV1 aad PV2 aets aa the swivetiag axis of the ahiftiag fork.
Fig.4 ilfastrates shiftiag of 5*Aeveiie speed gesr. As the shifter shift SI traasktes liaearly from its aeatral positioe K as iadieated by die thick arrows, die shift dog 01 appiiee foree oa fork pia FP. Thas die shifter folk F1 swivels aboit the axis of die pia bores PV1 daI'm As the sh&srisik F1 swivels, die shifter pads SP apply foree o« the shifter sleeve to shiftit to the desired speed gear poritioa. It a ay be aoted that the direetioB of
St V i&f I f ' f
traaslatioa of shifter shaft is opposite to that of (he shift pedaad heptee the
i !i . i
shifter sleeve. The dotted srrows indicate the direction oftraaafation of ahtft pad SP.
Pig.5 Utnatratea the ahiftfeg of iW speed geara. Aa the lifter shaft S3 traaalates linearly, shifter fork PI swivela ahont the axia of the phi boree PVI PV2 to shift the gears aa indented by die dotted arrows.
Fig 6 illustrates the skiftiag of the speed gears. As the shifter shaft S2 traaalates lineerly, shifter fork F2 swivels aboat the axis of the pia bores PVI aad PV2 to ahift the geara as indicated by dotted arrows.
In the present invention, the gaide shaft of tke conventional systea haa been eMa anted. The invention aaea three ahift dogs D1D2 D3 fuetenod to three shifter shafts SI S2 S3 to swivel die shifter forks F1F2 F3 aboat aa axis so aa to aove shifter sleeve ia a direction opposite to tkat of tke skifter shaft. Dae to reduced bending aoaeet, ckances of fidhu* of the ahifter forks are redaoed, thereby in (Teasing their fatigue lite.

We Claim
1.A gear shifting in echaaisai for sntaaotive synchro* esh traasaission coMpriafcg ^n* awtvetably aoiated shifter forks, three shifter shafts and
teee shifter sleeves, characterised it that three shifter dogs are respectively
fisateaed to the three shifter ahalla to awtvel the three shifter Ma ahoat as
axis aid shift the shifter sleeves to * predetenn hied gear poaitiea.
1A gear shifting ateehaaiaai as cleaned hi Claha 1 whereia the shifter doga are faatwed to the shifter shafts by spriag pias.
3. A gear ahtfliag aeohaaim aa claimed in Clean 1 or Cbaa 2 wherein eech shifter foffc haa aa esseably coaprisiag two shift pads aad two horea lor reoeiviag pias aetiag aa the swiveliag axes of the shiftiag fake; the said pads applying force, aa the shifter folks swivel, oa the shifter sleeves to shift theai to predetena iaed gear positions
4. A gear shifting aechaaisB for antoaotive synchros esh transaiesion aa herein described with reference to aad as illustrated ia die accoaipaayiag drawiags