| 翻訳と辞書 |
| Rocker cover ： ウィキペディア英語版 |
Rocker cover
Rocker covers are covers that are bolted on over rocker arms in an internal combustion engine. They are called valve covers in the United States, Canada, and in situations where Rocker Arms are not present, such as some Overhead Cam, and most Dual Overhead Cam engines. and rocker boxes in the United Kingdom.
On modern engines without rocker arms they are internationally known as "valve cover" but are sometimes refereed to as a "cam cover" or "timing cover" if they also cover the timing gear(s) and belt or chain.
V engines (V6, V8, etc.) usually have two rocker covers, one for each bank of cylinders, while straight engines (I4, I6, etc.) and single-cylinder engines usually have one rocker cover. Very large multi-cylinder engines, such as those used in a ship or in aviation, may have one rocker cover for each cylinder, to make removal and installation more manageable.
==History==
In early engines, these covers did not exist. As the rocker arms are critical to having the intake and exhaust valves operate, it was necessary to keep them constantly oiled. With these early engines, the rocker arms would have to be frequently oiled as the oil was constantly being thrown off or contaminated with dirt from the outside environment. The rocker cover was invented to keep the oil in and the dirt out. This part is now found on virtually every existing internal combustion engine today.
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「Rocker cover」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.
|
|