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Helical cut gears are similar to spur gears with their teeth cut at an angle. The most popular helical gear design is 45 degrees. Helical cut gears can have a right hand or a left hand helix. When 45° helical gears of the opposite hand operate together they will turn parallel shafts in opposite rotation. Helical gears of the same hand drive shafts at right angles.
In parallel shaft applications, the advantage of the helical gear design over spur gears is improved smoothness, with less noise due to the fact that the angled teeth engage more gradually and more than one tooth is in mesh at any time. The disadvantage of helical gears in parallel drives is the resultant thrust along the axis of the gear. This can be mitigated by the use of thrust bearings. The disadvantage of helical gears in right angle drives is increased sliding friction between the mating teeth. This can be mitigated by the use of proper lubricant.
Ondrives.US has inch or metric helical gears available over a broad range of pitch, teeth, material and hub styles.
Contact us for assistance in selecting helical gears for your application.
Ondrives.US also builds a range of Crossed Axis helical gearboxes.
The Ondrives.US Advantage: You can rely on our experience
Mount your gears on an Ondrives.US Precision Ground Shaft, available from stock.