| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a gear that enables heavy-load power transmission by smoothing an engaged state of teeth to prevent generation of noises and vibrations.SOLUTION: A trapezoidal tooth trace gear includes a tooth 2 with a trapezoidal tooth trace, which comprises a linear tooth part 4 formed in a central position in a tooth width direction, and a pair of helical tooth parts 5 and 6 twisted in directions opposite to each other and formed in both end positions in the tooth width direction. Particularly, the linear tooth part 4 is formed in such a shape that its tooth-width-direction length L1 is greater than a pitch of teeth 3 and smaller than the tooth-width-direction length L2 of the helical tooth parts 5 and 6.</p> |
