On 3/2/2016 11:39 PM, Chris Albertson wrote: > On Wed, Mar 2, 2016 at 12:28 PM, Dave Cole <[email protected]> wrote: > >> Spur gear transmissions are inherently noisy. I think that is why >> helical gears exist. However they typically have higher load >> capacity for the same width of gear (as I recall). >> > It is because the teeth are wider because they are at an angle. > But you can't swap in a helix gear without dealing with the end thrust. > You'd need to have a bearing that can handle the axial load. > A timing belt would be even more quiet. >
As I recall from my education years ago the reason why helicals are quieter is that more than one tooth is engaged at a time. So there is not an abrupt end to one tooth engagement and then the engagement of the next. That's why you almost never see straight cut gears in automotive transmissions. The General Motors 4 speed Muncie "Rock Crusher" manual transmission used low angle helical gears which made it almost a spur gear transmission. It was popular for drag cars since it could stand up to high torque shock loads. But the transmission made a lot of noise due to the low gear angle. Bewarned: Car Porn at the link below! https://www.youtube.com/watch?v=3_053IZjH7c Dave ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
