| 摘要 |
1,065,985. Toothed gearing. K. ROTH. Oct. 10, 1963 [Jan. 17, 1963], No. 40058/63. Heading F2Q. In a pair of meshing involute gears in which the shafts of the two gears are parallel to one another and wherein the virtual number of teeth on the pinion is equal to or less than five, both gears are helical and the helix angle is given by where B 0 = helix angle at the pitch cylinder, m n = module, b = minimum width of tooth and Zv= virtual number of teeth. The pinion has a small addendum and a large effective dedendum if it is the driver or a large addendum and small useful dedendum if driven, the profiles of the gear combination being complementary in respect of the tooth sides involved in power transmission. There is an addendum modification which is positive for the pinion in a stepdown combination but negative in a step-up combination, and positive for the wheel in a step-up combination. The pressure angle preferably is between 15 degrees and 25 degrees for a step-down combination and from 25 degrees to 35 degrees for a step-up combination. |
