Table of Contents
Gears
Gears are toothed wheels used for transmitting motion and power from one shaft to another when they are not too for apart and when a constant velocity ratio is desired.
Pitch
Pitch of two meshing gear is same. It is define as follow
1.Circular Pitch (p) –
It is the distance measured along the circumference of the pitch circle on one tooth to the corresponding point on the adjacent tooth.
2. Diametral Pitch P –
It is the number of teeth per unit length of the pitch circle dia. in inches.
Module (m)
Gear Ratio
Addendum
It is the radial height of a tooth above the pitch circle.
Dedendum
It is the radial depth of a tooth below the pitch circle. Its standard value is 1.157m.
Clearance
It’s radial difference between the addendum and the dedendum of a tooth.
Backlash
It is the difference between the space width and the tooth thickness along the pitch circle.
Backlash = Space width – Tooth thickness
Working Depth
It is the distance between top of addendum circle to the clearance circle.
Whole Depth
It is the total depth of a tooth space.
Tooth thickness
The tooth thickness is measured at the pitch diameter.
Face width
It is the distance of top of the gear teeth.
or
The length of the teeth in the axial direction.
Tooth face
The mating surface of a gear tooth between the addendum circle and the pitch circle.
Tooth flank
The mating surface of a gear tooth measured between the pitch circle and the base circle.
Fillet radius
It is the radius of the fillet curve at the base of the gear tooth.
Backlash
Backlash is the difference between the thickness of a tooth and the width of a tooth space on which it meshes.
Top land
The top land is the surface of the top of the tooth.
Gear center
A gear center is the center of the pitch circle.
Gear range
The gear range is difference between the highest and lowest gear ratios.
Helix angle
Helix angle is the angle between the helical tooth face and an equivalent spur tooth face.
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