Special Focus

Rack and Pinion

Classification of Gears

1. Depending on the relative position of the geometrical axes of the driving and driven shaft.
2. Depending upon No. of steps.
3. Depending upon the housing design.
4. Depending upon the peripheral Velocity.
5. Depending upon the accuracy of manufacture.

a. One Step Gears
b. Two Step Gears
c. Three Step Gears and so on...

a. Open Drives:- The gear drive is without a casing and is subjected to the action of dust and dirt.
b. Closed Drives:- The gear Drives are enclosed in special casings and are protected against dirt and dust and are
                              properly lubricated. 

1. Low Velocity: V is < 3 m/s.
2. Medium Velocity: V=3 to 15 m/s.
3. High Velocity: V is>15 m/s.

According to International Standard there are 12 degrees of accuracy of manufacture of gears, 1 being the highest.