Conjugate Relief in Gears/ Transmission Error

[bugatti79]

Folks,

1) Transmission Error: I understand it is the deviation of the driven gear from its theoretical position based on the driving gear moving with uniform angular velocity. Ie it is a measure of the where the driven gear actually is compared to where it should be...but I don't understand how this would induce noise or vibrations...the tooth pair are always in contact so there wouldn't be any vibration

I don't find it physically intuitive...


2)Could anyone explain to me (or provide sources of information) to what is conjugate relief in gears in the context of micro geometry analysis? Ie, I am looking at a graph of conjugate relief as a function of roll angle...

 

[Navin A S]

what does this mean?Conjugate relief in gears refers to the contact pattern of the gear teeth. It is calculated by plotting the position of the contact point on a gear tooth as it rotates, and then connecting the points to form a relief line. This relief line describes the shape of the contact between two meshing gears, and is used to optimize the contact for minimum wear, noise, and vibration. The roll angle is the angle at which the contact point is measured.