Posted by Mich John on November 18, 2008 at 15:50:22 from (76.122.171.26):
In Reply to: engineering question posted by john koritansky on November 18, 2008 at 09:43:54:
If these two are spur gears, then with one more tooth (and the same circumference {or radius} of the replaced gear),the individual tooth thickness must be less in order to mesh. This means there is a lessened ability to transmit equivalent torque unless the new gear has greater material strength. Since the new gear is the one doing the driving (and not the driven one), the driven gear (the one NOT being replaced) will rotate faster by a factor of 1/N where N is the number of teeth on the drive gear. Because as you say the pump was replaced, these two gears in the new pump should have been "engineered" or developed together so there should be NO issue with meshing, strength/durability and the capacity of this new pump could be greater (because the driven gear runs faster).
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