Specific sliding of external gear pair
Specific sliding of external gear pair
(OP)
Does any body know which standard is used for calcualting and specifying the specific sliding ratio for an external gear pair?
I know that this is a ratio of sliding velocity to the rolling velocity and is an indicator of the scoringg and noise generation.
I know that this is a ratio of sliding velocity to the rolling velocity and is an indicator of the scoringg and noise generation.





RE: Specific sliding of external gear pair
specific sliding is a mathematically defined feature of two meshing gears. All standards - if they show the way how to calculate it - must lead to the same result.
RE: Specific sliding of external gear pair
I am interested to know the range of value within which this ratio should be held.
RE: Specific sliding of external gear pair
Anytime the SAP Diameter approaches
the base diameter of the pinion
the values change dramatically.
If you are getting a very high ratio
on the pinion, you may want to consider
reducing or relieving the tips of the
gear.
RE: Specific sliding of external gear pair
RE: Specific sliding of external gear pair
I am not familiar with a standard that specifies a desired specific sliding but I have found a correlation that shows that when I use my software that follows the AGMA 2001-C95 and AGMA 908-B89 standards to calculate the gear life for pitting it appears that when the specific sliding is lower the life is longer.
This may be explained by the profile shift I made and/or the change to smaller teeth resulting in larger contact ratio which lowered the speicific sliding values and rate of change.
RE: Specific sliding of external gear pair
The reason for calculating the spec. sliding is to decide, if the "correction" of the teeth addendum is necessary. The goal then is to "balance" the sliding on both gears (to make the sliding values the same on both, if possible). There are calculating methods in advanced gear literature for finding the addendum modifications for both gears to reach this goal.
Of course there are also another considerations for the optimal tooth design, the described procedure is just one of them.
RE: Specific sliding of external gear pair
RE: Specific sliding of external gear pair
It is sold for $475 on the net.