Differential Temperature on Pinion Teeth

Is the temperature higher or lower at the tooth tip?

If the temperature is higher at the tip (I believe that would be farthest from kiln heat) it may be due to incorrect gear mesh. If most of the force is being applied at the tooth tip and you are getting excessive tooth interface sliding I would check for proper gear mesh. Tooth to root bind may also cause it.

If it is just a case where the kiln heat is making the tooth body hotter and therefor the tooth tip cooler is this a problem? Are you in a temperature range that would affect the metallurgy? Do you think a 10 degree Celsius differential could cause an internal stress problem?

thanks for the reply

since the kiln is rotating at 5 rpm and measurement carried out on pinion which is rotating at much faster rpm, we were unable to conclude that temperature is of tip or center.

we are worrying because difference in temperature reflect higher load at one end of teeth and eventually lead to high wear within short time.

can we correct the gear mesh ?. please guide us how to correct the mesh.

sameer

Any good gear reference such as "Machinery's Handbook" will give you the basics of gear set up.

Determine what the "diametral pitch" of the gearset is. This is done by taking some basic measurements and consulting a gear reference guide. Once you find the diametral pitch, you can determine what the "pitch circle" of each gear is. The gears should mesh at their pitch circle. Adjust the pinion accordingly. You may find a table that shows minimum clearance from the root to tip. It would be easier to set it up with this number but if the gear tip is worn off this would cause an incorrect set up.

Thanks Mr Dave for the reply - as per your recomendation we had checked Pitch diameter and found away at position where hot spot was observed. We had corrected, and found pressure distribution is better than earlier.

Again, Mr Dave, Thanks for the valuable suggessation.

regards

sameer