12-02-2020, 12:38 PM
**WARNING** Thread for super-mechanical geeks/nerds only.
I've always been fascinated with how a constant mesh motorcycle transmission works, with the cogs all meshed with their neighbor on the opposite shaft. It looks like it would bind up immediately when you start turning either shaft. The magic is that only half of the cogs on a given shaft are splined and forced to turn with it. The rest free-wheel.
I had too much time on my hands the other day and decided to make a spreadsheet that calculates the rotational velocity (rpms) of every moving part in the CB1100 powertrain, based on engine rpm. You enter engine rpm and the rear wheel diameter and road speeds for each gear is also given. Since the primary reduction ratio is known, each gear ratio is known, and the final drive (sprockets) ratio is known, everything can be calculated. I also diagramed how the power is transmitted through three different cogs for every gear selected.
Anyway, you may download the attached and play with the numbers to your hearts content. The values entered are for a 2014 model, but changing cell values can make the spreadsheet work for any six speed CB1100. I'd be happy to make one for the 5 speed models if somebody wants a copy.
![[Image: 234a37c982800a7483a74b7e00dfead1.gif]](https://cb1100forum.net/forum/uploads/imp/202012/234a37c982800a7483a74b7e00dfead1.gif)
[url=attachment.php?aid=12665]14CB1100Gears.xls (Size: 38 KB / Downloads: 21)
I've always been fascinated with how a constant mesh motorcycle transmission works, with the cogs all meshed with their neighbor on the opposite shaft. It looks like it would bind up immediately when you start turning either shaft. The magic is that only half of the cogs on a given shaft are splined and forced to turn with it. The rest free-wheel.
I had too much time on my hands the other day and decided to make a spreadsheet that calculates the rotational velocity (rpms) of every moving part in the CB1100 powertrain, based on engine rpm. You enter engine rpm and the rear wheel diameter and road speeds for each gear is also given. Since the primary reduction ratio is known, each gear ratio is known, and the final drive (sprockets) ratio is known, everything can be calculated. I also diagramed how the power is transmitted through three different cogs for every gear selected.
Anyway, you may download the attached and play with the numbers to your hearts content. The values entered are for a 2014 model, but changing cell values can make the spreadsheet work for any six speed CB1100. I'd be happy to make one for the 5 speed models if somebody wants a copy.
[url=attachment.php?aid=12665]14CB1100Gears.xls (Size: 38 KB / Downloads: 21)