Which
of the following gear system have minimum axial thrust?
Bevel
gears
Bevel
gears
Double
helical gears
Spur
gears
Double
helical gears
●Double
helical gear is equivalent to a pair of helical gear secured together, one
having a right hand helix and the other a left hand helix. They have a groove
between them.
●Axial
thrust which occurs in case of single helical is eliminated in double helical
gears, because axial thrust of the two rows of teeth cancels each other.
●Spar
gears are not subjected to axial thrust due to teeth load.
Hence, the correct option is (C).
&Key Points:-
If
the left and the right inclinations of a double helical gear meet at a common
apex and there is no groove in between, the gear is known as Herringbone gear.
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