An internal combustion engine 1 is an internal combustion engine of a compression ignition type. A bottom wall surface 311 has a pent-roof shape, and a bottom wall surface 712 has a protruding shape corresponding to the pent-roof shape. A piston 7 includes...

A combustion chamber structure for an internal combustion engine includes, in a piston top part, a concave portion (12) formed eccentrically with respect to a cylinder center axis (C1), and a tapered portion (20) that connects an upper end face (22) of the...

When diffusion combustion is performed, a squash flow (24) flows from a squash area (22) into a cavity portion (12b) during the compression stroke, the squish flow (24) is generated to form in the cavity portion (12b) a longitudinal vortex flow, in which a...

The engine has a central combustion cavity (44) that is placed in an upper side of a piston (16). The upper side has an annular peripheral zone (48) with tapered concave shape in order to be inclined towards the cavity. A cylinder head (18) has a chase sur...

The piston (5), designed to perform a sliding reciprocating motion inside and i.c. engine cylinder bore (3), has a cavity (26) in its upper face (27) that forms part of the cylinder's combustion chamber. The cavity has a grooved surface (30) that allows mo...

A diesel engine is provided, in which fuel is injected toward a lip portion 11 of a reentrant-type cavity 8. Fuel spray 15 reaches the lip portion 11 in the ignition lag time and forms fuel vapor 16 near the lip portion 11. With the expansive flow of the c...