Abstract
Bending and twisting deformations of gear shafts produce axis displacements that cause one-sided contact and transmission error in meshing gear pair. In this paper, effects of tooth surface modification on gear noise of helical gear pairs with the axis displacements are investigated. The obtained results are as follows. (1) Under a heavy load condition, the tooth surface modification equivalent to the axis displacement is effective to equalize the load distribution, but the gear noise hardly decreases. (2) Under a light load condition, the equivalent tooth surface modification increases the gear noise. (3) A small amount of bias modification decreases the gear noise, especially under a light load condition.
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