| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a gear capable of reducing surface roughness of tooth surfaces and improving the strength of the tooth surfaces.SOLUTION: The manufacturing method of a gear includes the steps of: applying compressive residual stress on tooth surfaces of teeth, engaging with each other; and reducing the height of protrusions of the tooth surfaces on which the compressive residual stress is applied and performing a finish so as to have predetermined surface roughness. The reduction amount of the height of the protrusions of the tooth surfaces is obtained so that the height of the protrusions of the tooth surfaces, reduced by the finish so as to have the predetermined surface roughness is equal to or under oil film thickness lying between the teeth engaging with each other, and at the step of applying the compressive residual stress, the compressive residual stress is applied so that the depth where the compressive residual stress is largest is the depth obtained by adding quantity of a polish of the tooth surfaces, to a target depth where the compressive residual stress of the gear finished so as to have the predetermined surface roughness is largest. |
