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E. under varying load in a test rig to confirm these predictions. Care must be taken when discussing "design load" in gearing to define exactly what is meant because one designer may be thinking purely in terms of strength so his "design" load will be the maximum that the drive can take. If, however, noise is the critical factor, "design load" may refer to the condition where noise has to be a minimum and may be only 10% of the permitted maximum load. If the requirement is for minimum noise at, for instance, half load, then the relief should correspondingly be a "medium" relief.

In addition, there is the major effect that roughly half the contact is occurring on either side of the pitch line so the corresponding friction forces are in opposite directions and tend to cancel out. The combination of effects means that "friction reversal" excitation may be ignored completely for helical gears and is small for spur gears. Similarly, "contact shock" effects are negligible for spur gears, and for helical gears, which have a very gradual take-up offeree, the effects are small unless there is serious misalignment.

Mech. , Vol 178, 1963-64, Part I, pp 207-226. Maag Gear Handbook (English version) Maag, CH8023, Zurich, Switzerland. 1 Proc. Inst. Mech. , Vol 172, 1958, pp 87-112. Niemann, G. ' VDI-Z, Vol 2, 1970, No 4 and No 8. Palmer, D. , Burton on Trent. E. E. with a strong regular excitation at once per tooth and harmonics (Fig.. 1), even when loaded. The idea of using a helical gear is that if we think of a helical gear as a pack of narrow spur gears, we average out the errors associated with each "slice" via the elasticity of the mesh by "staggering" the slices.

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