Timing Gear Train

Definition - What does Timing Gear Train mean?

A Timing Gear Train is a vital set of components in the engine which is used to transfer power from crankshaft to the camshaft and maintain the valve timing in the engine. This ensures that power and rotational motion from the crankshaft to the camshaft is transferred constantly without any abruptions enabling the engine to function properly. Timing of the engine can be maintained by gears, belts or chains. The majority of medium and almost all heavy duty engines have timing gears owing to their capability to withstand higher loads and since they have higher longevity compared to belts and chains.

Petropedia explains Timing Gear Train

The gear train can be placed either in the front or the rear of the engine. Most of the heavy duty engines have the timing gears in the rear of the engine; however, some have the gear train in the front of the engine. The crankshaft and camshaft positions are the main controlling factors for the layout of the timing gear train. Additionally, the layout of the gear train is dependent on the packaging possibilities in the engine compartment.

The gears of the gear train are mounted on shafts supported by the cylinder block. Bearings are very essential as well in order to minimize loss of power from friction and also to ensure smooth running of the gear. The bearings are mounted between the gears and the shafts.

The figure shows the gear train layout of an automobile.

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