Re: Gear noise reduction with lubrication


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Posted by Danljo on September 22, 2000 at 15:23:36:

In Reply to: Re: Gear noise reduction with lubrication posted by Rohit on September 22, 2000 at 09:44:02:

Part of why you have gear noise is due to the Spur
gears. That you go 15k RPM means you already have
good quality gears regarding involute profile, lead,
and p.d. runout. This eludes to the noise coming
from the accuracy of the gear set and the rigidity
of the system under load, where you may even get
harmonic action affecting the actual meshing
conditions. The thing to look at in changing to
a helical set is to increase the teeth in contact
through the helical overlap and keeping the helix
nominally down to not introduce end thrusting to
your system. Depending on the relative numbers
of teeth and more specifics such as the diametral
pitch, pressure angle, some diameters of the
gear set plus the center distance, you have a
given number of tooth pairs in contact at a
given time. If you're currently working around
1.5 teeth, you might want to move closer to 2.1
or so to just keep near integral pairs in contact
at all times. It all depends on what you're
working with now. The lubrication is a good issue,
I'm sure it is a factor in noise, but in my opinion
it is secondary. To estimate the additional teeth
in contact due to the facewidth with a helix
use the approximation Facewidth*Sin(helix)/NDP
where NDP=normal diametral pitch=(25.4/module).
For more detail we need more specifications
and parameters of your gear set.


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