| 单词 | planetary gear |
| 释义 | > as lemmasplanetary gear planetary gear n. Mechanics (a) an epicyclic gear; (b) any gearwheel whose axis revolves around another wheel; a planet wheel. ΚΠ 1860 Sci. Amer. 23 June 406/1 Upon the same shaft are two double-beveled gears, a a, which revolve loosely thereon in opposite directions, each engaging with a small planetary gear, b, which revolves loosely upon the stud, c, which is fast to the shaft, I. 1917 E. Butler Transmission Gears iii. 66 The first use of a planetary reducing gear as a transmission between a petrol motor and the driving wheel of an automobile, was made in 1888–9 by Edward Butler on his petrol cycle. 1975 Sci. Amer. Dec. 120/2 The upper end of the larger planetary gear engages a spur gear fixed to a turntable. 1991 New Scientist 1 June 24/3 Planetary gear modules can be combined to provide exposure times ranging from 1/30th of a second to 2 minutes. < as lemmas |
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