Direct-injection type diesel engine

Abstract

Abstract PURPOSE:To enable to lower the compression ratio of a diesel engine and to raise the brake mean effective pressure of the engine, by promoting vaporization of fuel by forming a combustion chamber in a recess formed in the top surface of a piston, and disposing a heater above the upper end surface. CONSTITUTION:A combustion chamber 4 is formed by forming a recess in the top surface 2 of a piston 1 and forming a projection at the central part on the bottom surface of said recess. Upwardly of the projection 3, an injection nozzle 6 is disposed to face the projection 3. A nozzle tip 8 has main injection holes 9 and a subsidiary injection hole 11 so as to inject fuel toward the side wall 7 of the combustion chamber 4. Further, an electric heater or the like serving as a heat source is disposed above the top surface 10 of the projection in the vicinity of the same so as to promote atomization of fuel drops scattered from the nozzle. With such an arrangement, it is enabled to lower the compression ratio of a diesel engine and to raise its shaft mean effective pressure.

Inventors

• 👤 Shiro Ishida
• 👤 石田　史郎

Bibliographic Details