|
The Bourke Engine was an attempt to improve the two-stroke engine by Russell Bourke in the 1920s. Despite finishing his design and building several working engines, the onset of World War II, lack of test results,〔http://bourke-enginefiles.i8.com/146.htm〕 and the poor health of his wife compounded to prevent his engine from ever coming successfully to market. The main claimed virtues of the design are that it has only two moving parts, is lightweight, powerful, has two power pulses per revolution, and does not need oil mixed into the fuel. The Bourke engine is basically a two-stroke design, with one horizontally opposed piston assembly using two pistons that move in the same direction at the same time, so that their operations are 180 degrees out of phase. The pistons are connected to a Scotch Yoke mechanism in place of the more usual crankshaft mechanism, thus the piston acceleration is perfectly sinusoidal. This causes the pistons to spend more time at top dead center than conventional engines. The incoming charge is compressed in a chamber under the pistons, as in a conventional crankcase-charged two-stroke engine. The connecting-rod seal prevents the fuel from contaminating the bottom-end lubricating oil. ==Operation== The operating cycle is very similar to that of a current production spark ignition two-stroke with crankcase compression, with two modifications: # The fuel is injected directly into the air as it moves through the transfer port. # The engine is designed to run without using spark ignition once it is warmed up. This is known as auto-ignition or dieseling, and the air/fuel mixture starts to burn due to the high temperature of the compressed gas, and/or the presence of hot metal in the combustion chamber. 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「Bourke engine」の詳細全文を読む スポンサード リンク
|