Patent ID: 6899076

Claim:
A swirl chamber used in association with a combustion chamber for diesel engines, wherein the combustion chamber is defined by a piston, a cylinder, and a cylinder head, the swirl chamber comprising: a mouthpiece fitted in a hole of the cylinder head, the hole having a bottom-open recess, and the mouthpiece including a top-open recess, the bottom-open recess and the top-open recess constituting a space intended for the swirl chamber; a main nozzle hole produced through a base wall of the mouthpiece to effect communication between the combustion chamber and the swirl chamber; and a pair of sub-nozzle holes, which are separated from the main nozzle hole, produced through the base wall of the mouthpiece, the holes being positioned on opposite sides of the central axis of the main nozzle hole when the mouthpiece is seen from just above; wherein each of the sub-nozzle holes is arranged to pass inside a hypothetical sphere depicted around a center of an upper circle of the top-open recess having a radius of 70% of a diameter of the upper circle of the top-open recess.