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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Gresley conjugated valve gear ： ウィキペディア英語版 Gresley conjugated valve gear The Gresley conjugated valve gear is a valve gear for steam locomotives designed by Sir Nigel Gresley, chief mechanical engineer of the LNER, assisted by Harold Holcroft. It enables a three-cylinder locomotive to operate with only the two sets of valve gear for the outside cylinders, and derives the valve motion for the inside cylinder from them by means of levers (the "2 to 1 lever" and "equal lever").〔(Restoration of Gresley A4 #60019 Bittern ) Diagram of Gresley and Walschaerts valve gear arrangement on LNER A4 locomotive - retrieved 4 October 2006〕 The gear is sometimes known as the Gresley-Holcroft gear, acknowledging Holcroft's major contributions to its development. ==Operation== The Gresley conjugated gear is effectively an adding machine, where the position of the valve for the inside cylinder is the sum of the positions of the two outside cylinders, but reversed in direction. It can also be thought of as a rocking lever between one outside cylinder and the inside cylinder, as is common on 4-cylinder steam locomotives, but with the pivot point being moved back and forth by a lever from the other outside cylinder. If we approximate the motion of each valve by a sine wave — if we say the position of a valve in its back-and-forth travel is exactly proportional to the sine of the "driver angle", once we have set the zero point of driver angle at the position it needs to be for that valve — then the mathematics is simple. The position of the valve that is pinned to the long end of the 2-to-1 lever is $\backslash scriptstyle\; \backslash sin\; \backslash ;\; \backslash theta$, while the positions of the other two valves are supposed to be $\backslash scriptstyle\; \backslash sin\; (\backslash theta\; +\; 120^\; \backslash circ)$ and $\backslash scriptstyle\; \backslash sin\; (\backslash theta\; -\; 120^\; \backslash circ)$. The position of the short end of the 2-to-1 lever is $\backslash scriptstyle\; -\; \backslash tfrac\; \backslash sin\; \backslash theta$—which, it turns out, is midway between $\backslash scriptstyle\; \backslash sin\; (\backslash theta\; +\; 120^\; \backslash circ)$ and $\backslash scriptstyle\; \backslash sin\; (\backslash theta\; -\; 120^\; \backslash circ)$ for any value of $\backslash scriptstyle\; \backslash ;\backslash !\; \backslash theta$. So a 1-to-1 lever pivoted on the short arm of the 2-to-1 lever will do the trick. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gresley conjugated valve gear」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.