7. Herringbone Gear
– A Herringbone Gear consists
basically of two rows of helical teeth
cut into one gear.
– The axial thrust forces are cancelled
by direct subtraction.
– Herringbone Gears are used for
heavy and continuous load
15. Reverted Gear Train
When the axes of the first gear (i.e.
first driver) and the last gear (i.e. last
driven or follower) are co-axial,then
the gear train is known as reverted
16. Epicyclic Gear Train
the axes of the shafts, over which the gears are
mounted, may move relative to a fixed axis.
If the motion is called epicyclic and the gear trains
arranged in such a manner that one or more of
their members move upon and around another
member are known as epicyclic gear trains
17. Velocity Ratioz of Epicyclic Gear
The following two methods may be used for finding out the
velocity ratio of an epicyclic gear train.
1. Tabular method, and
2. Algebraic method.
19. Gear Terminology
Path of approach
Path of recess
Path of contact
Arc of recess
Arc of contact
Angle of action