Construction arrangement of combustion chamber for use in direct fuel injection type diesel engines

Abstract

Abstract Herein disclosed are the construction arrangements of a combustion chamber for use in a direct fuel injection type Diesel engine. The combustion chamber is defined by a cylinder liner, a cylinder liner head and a piston being slidable within said cylinder and having a cavity at its crown portion. Means effect swirling motion in the combustion chamber, and a fuel injection nozzle is so attached at a cylinder head that its tip portion is disposed at the upper portion of the combustion chamber at the center of the cavity and has four or eight orifices being open so as to timely inject a metered fuel jet into the combustion chamber. According to a primary feature of the present invention, said cavity has the inner peripheral wall surface comprised of four flat inner side wall surfaces, each being in a straight line having the same length in its horizontal cross-section and respective adjacent straight lines being perpendicular to each other, and four inner corner wall surfaces, each being arcuate in its horizontal cross-section and being interposed between respective adjacent inner side wall surfaces and being so formed that the ratio of the radius of the corner wall surface to that of a circle, which is inscribed with said inner side wall surfaces, is the range of from 0.40 to 0.75. According to a secondary feature, the fuel injection direction of each of said orifices is so defined that fuel is injected from each orifice to the inner peripheral wall surface of the cavity at an angle excepting the range of from 40* to 55* extended from a straight line as a datum line, which is drawn between the center of the inscribed circle and a reference point which is defined by extending two edge lines of adjacent inner side wall surfaces, in the reverse direction to that of said swirling motion.

Inventors

• 👤 Motoyasu Kimbara
• 👤 Yoshitaka Yoshida

Bibliographic Details