Gear whine

[Jack Gifford]

I just read of paired gears being used by Honda (1968 CL350 primary drive) to have the efficiency of straight-cut gears without the normal noise level. Can someone describe for me the design details of "gear pairs"?

[RidgeRunner]

     You got me curious.  Harley not Honda but I did find some bits of new to me info here:  http://www.andrewsproducts.com/sites/www.andrewsproducts.com/files/catalog_pdfs/page_19.pdf

          Ed

[mtiberio]

If losses are due to thrust loads, I believe a herringbone pattern is quiet and has no thrust loads.

[wobblywalrus]

Jack, they were on the SL350's produced a few years later.  They used an engine like the Honda CB 350 twin street motor.  The SL 350 was made for street/dirt use.  The SL engines also had transmission gears that were drilled for weight reduction and magnesium alloy engine side covers.  If you can find a 1971 SL350 engine it will have the gears in it so you can look at them.    

[wobblywalrus]

Something I forgot to mention.  The SL350 also had a chromemoly frame.  It was the performance model of the 350 twin series.  The much more common CB and CL series twins had helical primary gears, undrilled trans gears, regular aluminum side covers, and mild steel frames.  Honda must have thought there were some performance benefits from those double straight cut gears, I suspect.

[saltwheels262]

I just read of paired gears being used by Honda (1968 CL350 primary drive) to have the efficiency of straight-cut gears without the normal noise level. Can someone describe for me the design details of "gear pairs"?

You must have gotten the current issue of Rider magazine in the mail.