To eliminate axial thrust, the following gear drive is employed_____________________?
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Answer: A. double helical gears having opposite teeth
Explanation
Helical gears generate unwanted axial thrust forces along their rotating shafts during regular power transmission operations. Pairing opposite helix angles on double helical gear configurations successfully cancels out these lateral thrust forces. This clever opposing tooth design ensures smooth power transmission without requiring heavy thrust bearings to manage loads. Helical gears feature angled teeth that engage gradually for smoother and quieter operation compared to spur gears. The helix angle creates a component of force parallel to the axis of rotation, known as axial thrust. Double helical or herringbone gears combine two opposing sets of helical teeth to neutralize this problematic side load.
Single helical gears cannot cancel their own axial thrust because they lack an opposing set of teeth. Double helical gears with identical teeth would reinforce the axial thrust rather than neutralizing or canceling it. Mutter gears do not represent a standard mechanical engineering solution for eliminating axial thrust forces in drives.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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