| 单词 | pitch surface |
| 释义 | > as lemmaspitch surface pitch surface n. Mechanics an imaginary surface passing through the teeth of one cogwheel, pinion, rack, etc., so as to touch the corresponding surface in another, without sliding, when the two components are geared together (see quot. 1869). ΚΠ 1869 W. J. M. Rankine Man. Machinery & Millwork iv. 82 The pitch surface of a toothed wheel or of a toothed rack is an ideal smooth surface, intermediate between the crests of the teeth and the bottoms of the spaces between them, which, by rolling contact with the pitch surface of another wheel, would communicate the same velocity-ratio that the teeth communicate by their sliding contact. 1887 D. A. Low Introd. Machine Drawing (1892) 40 A section of the pitch surface of a toothed wheel by a plane perpendicular to its axis is a circle, and is called a pitch circle. 1991 Power Transmission Design (Nexis) 34 No. 12. a255 In gearing of other types, axial pitch may be confined to the pitch surface and may be a circular measurement. < as lemmas |
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