Opposed-piston engine

An opposed-piston engine, comprising:

• a cylinder having a scavenging port on one side in an axial direction and an exhaust port on another side in the axial direction;
• a scavenging-side piston disposed inside the cylinder on the one side in the axial direction;
• an exhaust-side piston disposed inside the cylinder on the other side in the axial direction;
• and
• at least one fuel injection device configured to inject fuel between the scavenging-side piston and the exhaust-side piston inside the cylinder,
• wherein a top surface of the exhaust-side piston has an exhaust-side cavity with a predetermined cavity volume,
• wherein a top surface of the scavenging-side piston has a scavenging-side cavity with a larger cavity volume than the exhaust-side cavity, and
• wherein the at least one fuel injection device includes a scavenging-side fuel injection device having a central axis inclined to the one side in the axial direction toward an inner side in a radial direction of the cylinder,
• wherein the exhaust-side cavity is formed recessed in a central portion of the top surface of the exhaust-side piston,
• wherein the top surface of the exhaust-side piston includes an exhaust-side outer peripheral edge portion extending from an outer peripheral edge of the exhaust-side cavity toward an outer peripheral side along a direction perpendicular to the axial direction,
• wherein the scavenging-side cavity is formed recessed in a central portion of the top surface of the scavenging-side piston,
• wherein the top surface of the scavenging-side piston includes a scavenging-side outer peripheral edge portion extending from an outer peripheral edge of the scavenging-side cavity toward an outer peripheral side along a direction perpendicular to the axial direction, and
• wherein the scavenging-side fuel injection device is configured to inject the fuel from between the exhaust-side outer peripheral edge portion and the scavenging-side outer peripheral edge portion facing the exhaust-side outer peripheral edge portion.