| 摘要 |
<p>995,092. Toothed gearings. GENERAL MOTORS CORPORATION. Nov. 14, 1961 [Nov. 16, 1960], No. 40690/61. Heading F2Q. To reduce the amplitude of gear whine noise at normal tooth engagement frequency, selected irregularly-spaced teeth of one of a pair of involute toothed gears have contact surfaces relieved so as to introduce an additional noise at a lower frequency than that of normal tooth engagement. In a known planetary train (Fig. 1, not shown), wherein output planets mesh an input ring and a sun which latter may be frictionbraked via a one-way detent for reduced drive or clutched to the ring for direct drive, irregularly spaced teeth of the helical planets are relieved at 24, 26 wholly or, as shown, part way along one or both working faces (depending on uni- or bi-directional drive) approximately 0À002 inch below the normal involute profile and below the start of the working depth.</p> |
