| 单词 | pitch line |
| 释义 | > as lemmaspitch line pitch line n. Mechanics an imaginary line (often a circle) passing through the teeth of one cogwheel, pinion, rack, etc., so as to touch the corresponding line in another, without sliding, when the two components are geared together. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > wheel > [noun] > parts of wheels > tooth > imaginary line through pitch line1787 pitch circle1813 proportional circle1825 1787 J. Imison Treat. Mech. Powers 41 The pitch line of the two bevel wheels, or the line where the teeth of the two wheels act on each other. 1815 J. Smith Panorama Sci. & Art I. 362 The centre or pitch lines, from which the teeth are formed. 1981 M. A. Parker & F. Pickup Engin. Drawing (ed. 3) vi. 159 For a gear and rack in mesh the pitch line of the rack is tangential to the pitch circle of the gear. < as lemmas |
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