Patent ID: 9695738
Date: 2017-07-04
CPC Classifications: F01M,F02B,F02F

Claim:
1. A uniflow two-stroke engine, comprising: a cylinder receiving a piston such that the piston can reciprocate therein; an exhaust port provided in an upper end part of the cylinder; and a scavenging port that is provided in a lower side wall portion of the cylinder so as to be opened and closed by the piston, wherein a downstream portion of the scavenging port that opens out to the cylinder includes a guide member that gives a downward velocity component to a gas flow entering the cylinder from the scavenging port, the downstream portion of the scavenging port extends in a circumferential direction on a radially outer side of the cylinder, and a scavenging orifice serving as a downstream end of the scavenging port is divided into multiple openings by pillars extending between an upper edge and a lower edge of the scavenging orifice, each pillar being inclined with its lower end being displaced relative to its upper end such that a side wall surface of each pillar that faces an upstream side of the scavenging port faces obliquely downward in the circumferential direction.