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