4-cycle engine with auxiliary combustion chamber

Abstract

Abstract Translated from Japanese (57)【要約】 【目的】 本発明は、１回の圧縮行程で経時的に２回の 膨張行程を行わせ、低圧縮比で高膨張比を確保して理論 熱効率を向上させる副燃焼室を持つ４サイクルエンジン を提供する。 【構成】 本発明は、主燃焼室１と副燃焼室２とを連絡 孔４で連通させ、連絡孔４に副室開閉弁３を設ける。シ リンダ下部に形成した掃気ポート１１に掃気開閉弁７を 設ける。主燃焼室１に主室スパークプラグ５を設け、副 燃焼室２に副室スパークプラグ６を設ける。副室開閉弁 ３の閉鎖状態における圧縮上死点近傍で主室スパークプ ラグ５で主燃焼室１内の混合気を点火して膨張させ、次 のピストン上死点近傍で副室開閉弁３を開放して副室ス パークプラグ６で副燃焼室２内の混合気を点火して膨張 させる。 (57) [Summary] [PROBLEMS] The present invention is a sub-combustion chamber for improving the theoretical thermal efficiency by ensuring a high expansion ratio with a low compression ratio by performing two expansion strokes over time in one compression stroke. Providing a 4-cycle engine with. [Constitution] According to the present invention, the main combustion chamber 1 and the sub combustion chamber 2 are communicated with each other through a communication hole 4, and a sub chamber opening / closing valve 3 is provided in the communication hole 4. A scavenging opening / closing valve 7 is provided on a scavenging port 11 formed at the bottom of the cylinder. A main chamber spark plug 5 is provided in the main combustion chamber 1, and a sub chamber spark plug 6 is provided in the sub combustion chamber 2. In the closed state of the auxiliary chamber opening / closing valve 3, the main chamber spark plug 5 ignites and expands the air-fuel mixture in the main combustion chamber 1 near the top dead center, and the sub chamber opening / closing valve 3 is opened near the next piston top dead center. When opened, the auxiliary chamber spark plug 6 ignites and expands the air-fuel mixture in the auxiliary combustion chamber 2.

Inventors

• 👤 Hiroshi Matsuoka
• 👤 寛 松岡

Bibliographic Details