Mech 203 Term Project

8/13/2019 Mech 203 Term Project

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Automobile Transmission

Using the principle of mechanicaladvantage , transmissions provide aspeed-torque conversion(commonly known as "gearreduction" or "speed reduction")from a higher speed motor to a

slower but more forceful output orvice-versa.


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Autmobile Transmission

Most modern gearboxes eitherreduce an unsuitable high speedand low torque of the prime moveroutput shaft to a more stable lowerspeed with higher torque, or do theopposite and provide a mechanical

advantage (i.e increase in torque) toallow higher forces to be generated.


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Autmobile Transmission

Manual transmission come in twobasic types:

S liding-mesh Constant-mesh


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S liding-mesh or unsynchronized /non-synchronous system, wherestraight-cut spur gear sets arespinning freely, and must besynchronized by the operatormatching engine revs to road

speed, to avoid noisy and damaging"gear clash"
http://en.wikipedia.org/wiki/Manual_transmissionhttp://en.wikipedia.org/wiki/Manual_transmissionhttp://en.wikipedia.org/wiki/Manual_transmissionhttp://en.wikipedia.org/wiki/Manual_transmissionhttp://en.wikipedia.org/wiki/Manual_transmissionhttp://en.wikipedia.org/wiki/Manual_transmission


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Constant-mesh gearboxes whichcan include non-synchronised, orsynchronized/synchromesh systems,where diagonal cut helical (andsometimes double-helical) gear setsare constantly "meshed" together,and a dog clutch is used for changinggears. On synchromesh boxes,friction cones or "synchro-rings" areused in addition to the dog clutch.


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Automobile transmission


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Automobile transmission in Unigraphics

The challenging part of designing atransmission in unigraphics was theamount of gears we had to draw. Geardrawing is hard due to the fact that eachgear has to be perfect since they have tofit with the adjacent gears. We used the

dimensions acquired from machineshops and internet to design an accuratetransmission.


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We designed fifteen gears for ourtrasmission (5 gears and reverse). Wealso included the synchronizersbetween the gears.


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Documents

Mech 203 Term Project