| 摘要 |
<p>1,017,809. Toothed gearing. GENERAL MOTORS CORPORATION. April 25, 1963 [May 24, 1962], No. 16297/63. Heading F2Q. In order to reduce noise in a pair of intermeshing gears, e.g. in the crown and pinion drive of a vehicle back axle, Figs. 1 and 2 (not shown), the gears are so made that the contact marking patterns of the teeth of one of the gears differ from each other in an irregular manner, the contact marking pattern being the overall area of a tooth face which is contacted by parts of a mating tooth between the initial and terminal points of contact. As shown in Fig. 4, the pattern of each tooth of a ten-tooth pinion is different, but it is also possible for patterns to be repeated provided that the variation around a gear-wheel is aperiodic. The differing contact patterns may be produced by varying the tooth profile (e.g. by adjustments during forming, cutting, milling or grinding operations), by changing the initial and terminal points of contact between teeth, by varying the helix angle or by varying the tooth spacing.</p> |
