What difference will straight cut gears make?
What's the difference between an input shaft and an input shaft with 1st and 2nd straight cut gears? Any benefits, differences, etc
What's the difference between an input shaft and an input shaft with 1st and 2nd straight cut gears? Any benefits, differences, etc
Mr. Smartypants
Favorite Answer
Straight-cut gears can transmit more torque than helical gears because there is no axial thrust component. IOW if you have two helical gears, one driving the other, there is a force trying to push the gears apart. This uses up some of the power, also it requires stronger bearings and a stronger case to hold the gears together. Straight-cut gears don't push each other apart. They're also easier to make.
The disadvantage is that they're a lot louder. Helical gears mesh in a small percentage of each tooth at one time, but with straight-cut gears the whole tooth is meshed. And for the same reason, helical gears can transmit more torque! Plus it's harder on straight-cut gears when meshed/unmeshed in a transmission.
EDIT. Wait. I said straight-cut gears could transmit more torque and then I said helical-cut gears could transmit more torque. That can't be right. Let me look it up.
HELICAL gears can transmit more torque. My bad.
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Straight-cut are cheaper to make . . . . helical developed to reduce noise and provide more contact area.