| 单词 | pitch diameter |
| 释义 | > as lemmaspitch diameter pitch diameter n. Mechanics the diameter of the pitch circle of a cogwheel, gear, etc. ΚΠ 1813 A. Rees Cycl. (1819) XXIII. at Mill-work A circle..is described round the face of the rough cogs upon its pitch diameter, that is, the geometrical diameter, or acting line of the cogs; so that when the two wheels are at work together, the pitch circles..of the two are in contact. 1930 F. D. Jones Ingenious Mechanisms I. 324 The number of revolutions made by gear b will equal..the pitch diameter of a divided by the pitch diameter of b. 1984 E. P. DeGarmo et al. Materials & Processes in Manuf. (ed. 6) xxviii. 744 All design calculations relating to gear performance are based on the pitch-circle diameter or, more simply, the pitch diameter. < as lemmas |
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