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55
IV. GEARS AND GEARING
(PART II)
Face advance is the distance on the pitch circle that a gear tooth
travels from the time pitch point contact is made at one end of the tooth
until pitch point contact is made at the other end.
Fillet radius is the radius of the concave portion of the tooth profile
where it joins the bottom of the tooth space.
Fillet stress is the maximum tensile stress in the gear tooth fillet.
Flank of tooth is the surface between the pitch circle and the bottom
land, including the gear tooth fillet.
Gear ratio is the ratio between the numbers of teeth in mating gears.
Helical overlap is the effective face width of a helical gear divided by
the gear axial pitch.
Helix angle is the angle that a helical gear tooth makes with the gear
axis at the pitch circle, unless specified otherwise.
Hertz stress, see Contact stress.
Highest point of single tooth contact (HPSTC) is the largest diameter
on a spur gear at which a single tooth is in contact with the mating gear.
Interference is the contact between mating teeth at some point other
than along the line of action.
Internal diameter is the diameter of a circle that coincides with the
tops of the teeth of an internal gear.
Internal gear is a gear with teeth on the inner cylindrical surface.
Involute is the curve generally used as the profile of gear teeth. The
curve is the path of a point on a straight line as it rolls along a convex
base curve, usually a circle.
Land: The top land is the top surface of a gear tooth and the bottom
land is the surface of the gear between the fillets of adjacent teeth.
Lead is the axial advance of the helix in one complete turn, or the
distance along its own axis on one revolution if the gear were free to
move axially.
Length of action is the distance on an involute line of action through
which the point of contact moves during the action of the tooth profile.
Line of action is the portion of the common tangent to the base
cylinders along which contact between mating involute teeth occurs.
Lowest point of single tooth contact (LPSTC) is the smallest diameter
on a spur gear at which a single tooth is in contact with its mating gear.
Gear set contact stress is determined with a load placed on the pinion at
this point.
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