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A pistonless rotary engine is an internal combustion engine that does not use pistons in the way a reciprocating engine does, but instead uses one or more rotors, sometimes called rotary pistons. An example of a pistonless rotary engine is the Wankel engine. The term ''rotary combustion engine'' has been suggested as an alternative name for these engines to distinguish them from early (generally up to the early 1920s) aircraft engines and motorcycle engines also known as ''rotary engines''. However, both continue to be called ''rotary engines'' and only the context determines which type is meant. ==Pistonless rotary engines== The basic concept of a (pistonless) rotary engine avoids the reciprocating motion of the piston with its inherent vibration and rotational-speed-related mechanical stress. the Wankel engine is the only successful pistonless rotary engine, but many similar concepts have been proposed and are under various stages of development. Examples of rotary engines include: ;Production stage: * Beauchamp Tower's nineteenth century (spherical steam engine ) (theoretically adaptable to use internal combustion) * The Wankel engine * The Atkinson cycle engine ;Development stage: * The Baylin Engine 〔("How the Baylin Engine Works." ) ''Popular Mechanics'', July 1946, pp. 131-132.〕 * The Engineair engine * The Liquidpiston engine * The Crankless engine () * The Hamilton Walker engine * The Quasiturbine * The Ramgen Integrated Supersonic Component Engine * The Rand cam engine * The RKM engine (RotationsKolbenMaschine) * The Sarich orbital engine * The Tri-Dyne Engine〔("Tri-Dyne: Slick New Rotary Engine Could Lick the Wankel." ) ''Popular Science'', July 1969, pp. 45-47 & 160-162.〕 * The Trochilic engine * The Wave disk engine * The Moto Turbine Radiale by Jean Claude Lefeuvre () * The Jonova engine * The Renault-Rambler lobular rotor engine (Spanish pat nº 0313466) ;Conceptual stage: * The Gerotor engine * The Rotary Engine by Jose-Ignacio Martin-Artajo, SI () * The Jose Maria Bosch-Barata engines ( Spanish pats nºs 0228187, 0254176 and 0407242) 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「Pistonless rotary engine」の詳細全文を読む スポンサード リンク
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