翻訳と辞書 Words near each other ・ Pneumatic line thrower ・ Pneumatic lubricator ・ Pneumatic motor ・ Pneumatic non-return valve ・ Pneumatic otoscopy ・ Pneumatic refuse conveying system ・ Pneumatic school ・ Pneumatic Slaughter ・ Pneumatic stabilized platform ・ Pneumatic tool ・ Pneumatic torque wrench ・ Pneumatic trail ・ Pneumatic trough ・ Pneumatic tube ・ Pneumatic tube mail in New York City ・ Pneumatic valve springs ・ Pneumatic weapon ・ Pneumatic web guides ・ Pneumatics ・ Pneumatics automation ・ Pneumatoarthrus ・ Pneumatocele ・ Pneumatocyst ・ Pneumatology ・ Pneumatology (Christianity) ・ Pneumatolysis ・ Pneumatomachi ・ Pneumatopteris pennigera ・ Pneumatoraptor ・ Pneumatosis Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Pneumatic valve springs ： ウィキペディア英語版 Pneumatic valve springs Pneumatic valve springs are metal bellows filled with compressed air used as an alternative to the metal wire springs used to close valves in high-speed internal combustion engines. This system was introduced in the mid-1980s in Renault turbocharged 1.5 litre Formula One engines. == Concept == Racing engines often fail at high rotational speeds because mechanical springs are unable to retract the valves quickly enough to provide clearance for the piston. Renault's pneumatic valve technology replaced steel springs with light weight compressed air bellows. These could retract valves more quickly and reduce the possibility of piston-valve interference, as long as pressure could be maintained. Additionally, the amount of seat tension required to keep a coil sprung valve under control results in greater peak lift loading, with added stress to the entire valvetrain as a result. Pneumatic systems, sharing a common reservoir of pressure retain a more static level of force, controlling the valve effectively, without any attendant peak lift load increase. The actuation mechanism is simply a piston and cylinder, similar to a small pneumatic ram. The ''tappet bore'' where a hydraulic tappet would normally reside, becomes the cylinder, and the retainer assembly becomes the piston. Pressurized air (nitrogen) is pumped into this cylinder which then causes the piston/retainer to rise to the top of cylinder, causing the valve to form an airtight seal with the seat. The compressed gas then becomes the spring so to speak, and does not have the same traits as springs do at elevated rpm. A small light spring is sometimes fitted between the piston and retainer so that when the system is switched off the spring forces the piston down against the bottom of bore and thus forces the retainer upwards. This ensures that no crown-to-valve contact occurs when shut down. 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「Pneumatic valve springs」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.