著者

堀 光平 林 巖

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.62, no.596, pp.1548-1555, 1996-04-25

被引用文献数

6

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To improve the efficiency of 3K-type mechanical paradox planetary gear drive, a new design method called the approach-and recess-contact ratio equalization method is proposed and described. The concept of this method is to satisfy the coaxial condition of the rotatory- and fixed-internal gear pairs, which have a large influence on the efficiency of the gear drive, and simultaneously to maximize their efficiency. For this purpose, first the contact ratios of the two internal gear pairs are given ; second, their profile-shift coefficients are determined so that the coaxial condition can be satisfied ; then, the diameters of their addendum circles are determined so that their approach- and recess-contact ratios can be equalized. The efficiency of the gear drive obtained by this design method is theoretically calculated under the assumption that the tooth surface frictional coefficients are all 0.1. Consequently, the maximum efficiency of 86.1% is obtained on a gear drive with a reduction ratio of 1/351 and a contact ratio of 1.2. This obtained efficiency is higher by 12% and 8% than the efficiencies of 74% and 78%, obtained by the conventional design method without and with profile-shift coefficient optimization, respectively.