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An automobile consists of two different Belt Drive Systems as follow.
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| It controls correct up-down point of time of |
| piston and valve connecting with crank |
| pulley and cam pulley with timing(teethed profile) belt. |
| That is, it makes continuousof 4 stroke cycle engine as |
| controlling piston movement and valve opening/shutting timing. |
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| It supply driving force to accessory device which aids for driving i.e. alternator, |
| water pump, air-conditioner, power-steering, fuel-pump, etc. |
| It needs not correct timing so it uses poly v-belt. |
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