| 释义 |
helical, a. and n.|ˈhɛlɪkəl|
[f. L. helix, helic-em (see helix) + -al1.]
A. adj. Belonging to or having the form of a helix; screw-shaped; spiral. Also Comb., as helical gear, tube; helical-cut adj.
1613M. Ridley Magn. Bodies 27 A Helicall and Spirall vertue to move on the Cilinder of her Axis in Spirall lines. 1641Wilkins Math. Magick i. ix. (1648) 57 A helicall revolution about a Cylinder. 1789Trans. Soc. Arts I. 217 The mean helical angles of Archimedean or Water Screws. 1884F. J. Britten Watch & Clockm. 16 For marine chronometers helical springs, in which both ends curve inwards, are universally used. 1888Lockwood's Dict. Mech. Engin., Helical gear, toothed gear in which the wheel-teeth instead of being at right angles with their faces are set at some other angle therewith. 1904Goodchild & Tweney Technol. & Sci. Dict. s.v. Cycles, A form of tube known as ‘helical’, which is formed from a thin steel band or ribbon, wrapped into the form of a tube and brazed at the edges. 1908Westm. Gaz. 28 May 4/2 The live axle is chiefly noticeable for its helical-cut driving pinion. Ibid. 18 Nov. 5/1 Several of the wheels have helical-cut teeth. 1958Which? I. iii. 30 The new..[drill] has..helical gears, which give quieter running and longer life.
B. n. = helical gear.
1913Lockwood's Dict. Mech. Engin. (ed. 4) s.v. Helical gear cutting, Double helicals are cut in the same way if the teeth are staggered and divided at the apex. |