Intake apparatus for engine

Abstract

Abstract PURPOSE:To improve the combustion efficiency of an engine in low-load operation by setting the inflow angle of the intake supplied from an intake port for low-load smaller than that of an intake port for high load, in a pair of intake ports offset in the directions opposed each other. CONSTITUTION:A cylinder 1 is equipped with a pair of intake ports 2 and 3 and a pair of exhaust ports 4 and 5, and the intake port 2 having a relatively small diameter is used for low load, and the intake port 3 having a relative large diameter is used for high load. Each intake port 2, 3 is opened, offset at the position opposed with respect to the center line of the cylinder 1, and the intake flow which is introduced into a combustion chamber 8 from the intake port 2 forms a swirl flow S. In order to strengthen the swirl S in this case, the inclination angle of the intake port 2 with respect to the deck surface 9A of a cylindrical head 9 is set smaller than that of the intake port 3. Therefore, the combustion efficiency of the engine in low-load operation can be improved furthermore.

Inventors

• 👤 Toshimasu Tanaka
• 👤 田中　稔益
• 👤 Yasuyuki Morita
• 👤 泰之 森田

Bibliographic Details