The important definitions related
to spur gear are as follows:
ADDENDUM CIRCLE: it is the circle drawn through the top of the teeth which is concentric to the pitch circle.
DEDENDUM CIRCLE: it is the circle drawn through the bottom of the teeth. It is also called as root circle.
PITCH CIRCLE DIAMETER (D): it is the diameter of pitch circle. The size of the gear is usually specified by the pitch circle diameter.
MODULE (m): it is the ratio of the pitch circle diameter to the number o f teeth on gear.
CIRCULAR PITCH (Pc): it is the circular distance measured along the circumference of pitch circle from a point of one tooth to the corresponding point on adjacent tooth.
DIAMETER PITCH (Pd):It is the ratio of number of teeth to the pitch circle diameter.
ADDENDUM: it is the radial distance of tooth from the pitch circle to the top of the tooth. Its standard value is one module.
DEDENDUM: it is the radial distance of tooth from the pitch circle to the bottom of the tooth. Its standard value is 1.15.
CLEARANCE : it is the radial distance between the top of the tooth of one gear to bottom of the tooth of another mating gear. Its standard value is 0.157.
TOTAL DEPTH: it is the radial distance between the top of the tooth to bottom of the tooth. it is equal to the sum of the addendum and dedendum of a gear.
WORKING DEPTH: it is the radial distance from addendum circle to the clearance circle. It is equal to the addendum of two mating gears.
TOOTH THICKNESS: it is the width of the teeth measured along pitch circle.
TOOTH SPACE: it is the space between two adjacent tooth measured along the pitch circle.
BACKLASH: it is the distance between tooth space and tooth thickness measured along the pitch circle.
FACE OF TOOTH: it is the surface of the gear above pitch circle.
FLANK OF TOOTH: it is the surface of the gear below pitch circle.
TOP LAND: it is the surface at the top of the tooth.
#2.SPUR GEAR TERMINOLOGY |IN HINDI| |KOM|. https://youtu.be/LE4P14mqyGw
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