Question:
can anyone tell me why heavy duty vehicles use spur gears instead of helical gears in manual transmissions?
i thought helical gears were better when it came to torque and higher performance.
Answer by Joe P
Straight gears are stronger.
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because of the very high torque and power being applied to those gears. The helical gears would send shafts out the side of the case instead of transferring that power. Just like you stepping on a banana peel,…. slliiiippp!
also helical gears put a side load on the shafts when torque is applied, straight cut gears do not
Spur gears transfer the torque at 180 degrees with no side load. All of the stress is on the gears and not the thrust washers, case or shaft.
In a heavy duty vehicle, this allows for a lighter, stronger transmission where gear noise really isn’t a factor.
On a helical gear, there is a significant amount of side force because of the gear angles. In lighter duty vehicles, this effect is out weighed by the quieter operation and greater wear area – but it also limits the torque which can be transferred.