Question
Download Solution PDFWhich of the following gears have straight as well as spiral teeth?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Helical Gear:
- In a helical gear, the teeth are cut at an angle to the axis of rotation.
- It is used to transmit power between two parallel shafts.
- The end thrust is exerted by the driving and driven gears in the case of helical gears and the thrust may be eliminated by using double helical gears. These gears are called herring-bone gears.
Spur Gear:
- The teeth are cut parallel to the axis of rotation.
- The spur gears are used to transmit power between two parallel shafts.
Bevel Gear:
- Bevel gears are used to transmit motion between shafts at various angles to each other.
- The teeth profile may be straight or spiral.
Hypoid gears:
- The hypoid gears are used in automobile differential gearboxes.
- The tooth action between each gear is a combination of rolling and sliding action along the straight line.
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