What is Gear Terminology | Definition of gear
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.
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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.
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Module (m)
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Gear Ratio
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Addendum
It is the radial height of a tooth above the pitch circle.
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Dedendum
It is the radial depth of a tooth below the pitch circle. Its standard value is 1.157m.
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Clearance
It’s radial difference between the addendum and the dedendum of a tooth.
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Backlash
It is the difference between the space width and the tooth thickness along the pitch circle.
Backlash = Space width – Tooth thickness
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Working Depth
It is the distance between top of addendum circle to the clearance circle.
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Whole Depth
It is the total depth of a tooth space.
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Tooth thickness
The tooth thickness is measured at the pitch diameter.
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Face width
It is the distance of top of the gear teeth.
or
The length of the teeth in the axial direction.
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Tooth face
The mating surface of a gear tooth between the addendum circle and the pitch circle.
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Tooth flank
The mating surface of a gear tooth measured between the pitch circle and the base circle.
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Fillet radius
It is the radius of the fillet curve at the base of the gear tooth.
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Backlash
Backlash is the difference between the thickness of a tooth and the width of a tooth space on which it meshes.
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Top land
The top land is the surface of the top of the tooth.
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Gear center
A gear center is the center of the pitch circle.
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Gear range
The gear range is difference between the highest and lowest gear ratios.
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Helix angle
Helix angle is the angle between the helical tooth face and an equivalent spur tooth face.
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