Patent ID: RE41344

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 recess of the cylinder head, the hole recess 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 sub- nozzle holes being positioned on opposite sides of the a 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 and a hypothetical sphere, which is centered at a center of an upper circle of the top- open recess, the hypothetical sphere has a radius of 70 % of a radius of the upper circle of the top - open recess, and each of the sub - nozzle holes being arranged to pass a central axis of the sub - nozzle holes through an interior area of the hypothetical sphere; wherein the main nozzle hole comprises a main groove and two side grooves, each of the side grooves is communicatively continuous with respect to the main groove through banks, the main groove and each of the side grooves extend forwardly and upwardly from the main combustion chamber to the swirl chamber through the bottom wall, and when the mouthpiece is viewed from above, each of the side grooves is arranged at a position rearwardly relative to an upper opening of the sub - nozzle holes .