1. this is very easy curve for manufacturing
2. sliding does not takes place anywhere on meshing teeth
3. involute is the only profile that gives conjugate action
4. change in the center distance does not change gear ratio
change in the center distance does not change gear ratio
1. decreasing center distance between gears
2. decreasing module
3. decreasing pressure angle
4. increasing number of teeth
increasing number of teeth
1. 78%
2. 85%
3. 63%
4. 96%
85\%
1. Unchanged
2. 12000 hours
3. 1500 hours
4. 6000 hours
12000 hours
1. 78%
2. 85%
3. 63%
4. 96%
85\%
1. increases 8 times
2. increases 4 times
3. increases 2 times
4. not change
increases 8 times
1. a-u, b-q, c-r, d-t
2. a-v, b-s, c-r, d-t
3. a-u, b-s, c-r, d-v
4. a-u, b-s, c-r, d-v
a-u, b-q, c-r, d-t
1. for increased radial load
2. for increased thrust load
3. when there is less radial loa
4. to compensate for angular misalignment
to compensate for angular misalignment
1. 81/16
2. 27/8
3. 9/4
4. 3/2
27/8
1. hydrostatic lubrication
2. hydrodynamic lubrication
3. mixed (or semi-fluid) lubrication
4. boundary lubrication
hydrostatic lubrication