effect of backlash on durability of straight gears
effect of backlash on durability of straight gears
(OP)
Hi,
I am analysing a gear train consisting of straight gears. Briefly the method I am using is as follows:
1- Dynamic simulation of the entire system (torsional model of engine) to calculate critical speeds corresponding to peaks in crankshaft / camshaft /geartrain torsional amplitudes.
2- At the critical speeds, perform FEA on each gear applying loads calculated at each crank angle and build a stress history.
My findings are that reducing the backlash between gears greatly improves durability (fatigue safety factors). I don't have a lot of practical experience with gears and I wonder whether any of you could confirm (or not) this
Thanks
Gio1





RE: effect of backlash on durability of straight gears
As a refinement consider helical gears and thicker gear teeth on the smaller gear, the pinion. This is putting more thickness where needed.
RE: effect of backlash on durability of straight gears
RE: effect of backlash on durability of straight gears
to achieve smaller backlash, theoretically
you are getting a greater contact ratio.
I assume this increases your durability
ratio.
RE: effect of backlash on durability of straight gears
to achieve smaller backlash, theoretically
you are getting a greater contact ratio.
I assume this increases your durability
ratio. The converse is true. I would think
that the change would be marginal.
RE: effect of backlash on durability of straight gears
Thank you for your suggestions.
Helical gears are not possible due to other design constraints, but reducing the backlash looks like the way to go
RE: effect of backlash on durability of straight gears
RE: effect of backlash on durability of straight gears
pinions with short addendum gears?
Sometimes called recess action
gearing. Higher strengths for the
pinions and hidden life effects.
RE: effect of backlash on durability of straight gears
RE: effect of backlash on durability of straight gears