Two-cycle internal combustion engine

Abstract

Abstract PURPOSE:To make strong loop scavenging of a two-cycle internal combustion engine, in which mask walls are formed between a pair of air supply valves and a pair of exhaust valves, by allowing the mask wall to block the opening between a valve seat and the air supply valve perimeters on the exhaust valve side over the whole period of opening of the air supply valve. CONSTITUTION:A triangularly profiled bulge 5 is provided, which protrudes toward a combustion chamber above the inner wall surface 3a of a cylinder head 3 and stretches over the whole diameter of the inner wall 3a of the cylinder head 3. A pair of supply valves 6 and a pair of exhaust valves 7 are arranged on both sides of this bulge 5. On this bulge 5, mask walls 10 in the form of circular arc stretching along the peripheries of the supply valves 6 are formed so as to block openings A between the valve seat 9 and each valve 6 perimeter on the exhaust valve 7 side. Therein each mask wall 10 is stretching toward the combustion chamber 4 below that supply valve 6 which is situated in the max. lift position. Thereby the openings A are blocked by respective mask walls 10 over the whole opening time of the supply valves 6.

Inventors

• 👤 Toshio Tanahashi
• 👤 敏雄 棚橋
• 👤 Masanobu Kanamaru
• 👤 昌宣 金丸

Bibliographic Details