| 单词 | base circle |
| 释义 | > as lemmasbase circle base circle n. Mechanics the circle from which are generated the involutes forming the profiles of gear teeth, having the form of a circle concentric with the pitch circle but of slightly smaller diameter.The involute is obtained from the base circle by rolling a straight generating line around it; the locus of a fixed point on the generating line is the involute. ΚΠ 1824 Amer. Jrnl. Sci. 7 93 When the base circles and generating curve simultaneously roll together, the describing point and point of action constantly coincide. 1869 W. J. M. Rankine Man. Machinery & Millwork iv. 121 That point will trace..part of the involute of the base-circle D1, and on a plane rotating along with the wheel 2, part of the involute of the base-circle D2. 2004 C. H. Simmons & D. E. Maguire Man. Engin. Drawing (ed. 2) xxiv. 195 For an involute rack, the base-circle radius is of infinite length, and the tooth flank is therefore straight. < as lemmas |
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