Question
Download Solution PDFWhich one of the following cam shaft drive mechanism is used when crank shaft and cam shaft are very closer to each other?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe camshaft gets the drive from the crankshaft and rotates at half the crankshaft speed, since each valve opens once in every two revolutions of the crankshaft. There are three types of camshaft drive mechanisms.
- Gear drive
- Chain drive
- Belt drive
Gear drive: This direct drive is used where the crankshaft and the camshaft are very close to each other. Since the r.p.m. of the camshaft is half of the crankshaft speed, the camshaft gear teeth is twice as many as the crankshaft gear teeth. In this, the engine’s camshaft rotates in the reverse direction of the crankshaft. In some engines an idler gear is used to have the same direction of rotation for the crankshaft and the camshaft.
Chain drive: The timing gear sprockets are driven by a chain. Hence this drive is called a sprocket drive. The direction of rotation of the crankshaft and camshaft is the same. It is used when the distance between the crankshaft and the camshaft is more. No idler gear is used in the chain drive.
Belt drive: This drive is similar to a chain drive. Instead of a chain a belt is used to drive the camshaft. The belt drive is mostly used in overhead camshaft design. The direction of rotation of the camshaft and crankshaft is the same. An automatic belt tensioner is used to avoid slipping of the belt.
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