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(11) | EP 0 108 706 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Cylinder liner for a uniflow type two cycle internal combustion engine |
| (57) An improved cylinder liner for an uniflow type two cycle internal combustion engine
of the type including a number of scavenging holes formed thereon in an equally spaced
relation in the peripheral direction is disclosed, wherein the improvement consists
in that the centre line (Y, - Yi) extending across the outer opening of the scavenging holes on the outer peripheral
surface of the cylinder liner is inclined in the opposite direction to that of the
swirl flow S and the upper swirl angle (02) is determined larger than the lower swirl angle (0'2) so that an air passage extending through each of the scavenging holes is twisted
away from the vertical plane. Further, another improved cylinder liner for an uniflow
type two cycle internal combustion engine is disclosed, wherein the improvement consists
in that each of the scavenging holes comprises a combination of plural circular holes
arranged in an end-to-end relation in the substantially axial direction of the cylinder
and the linear line (Yi - Y1) extending through the center (O1) of the lowermost hole part and the centre (02) of the uppermost hole part on the outer opening of the scavenging holes on the outer
peripheral surface of the cylinder liner is inclined in the opposite direction to
that of the scavenging swirl flow S, wherein the upper swirl angle (θ3) is determined larger than the lower swirl angle (θ1) so that an air passage extending through each of the scavenging holes is twisted
away from the vertical plane. |