| 摘要 |
<p>An improved power tong gear train (19) which includes a ring gear (6) having a series of teeth and a roller surface (12). The gear train further includes an idler gear assembly (40) having a series of teeth and a roller element (44) fixed thereto. The idler gear assembly (40) is positioned such that the roller element (44) engages the roller surface (12) and maintains the tangential orientation of the two gears' respective pitch diameters.</p> |
