US 12,331,675 B2
Opposed-piston engine
Shintaro Shuto, Tokyo (JP); Kengo Tanaka, Tokyo (JP); and Keita Suzuki, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 18/278,748
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Mar. 22, 2022, PCT No. PCT/JP2022/012955
§ 371(c)(1), (2) Date Aug. 24, 2023,
PCT Pub. No. WO2022/202739, PCT Pub. Date Sep. 29, 2022.
Claims priority of application No. 2021-053446 (JP), filed on Mar. 26, 2021.
Prior Publication US 2024/0151177 A1, May 9, 2024
Int. Cl. F02B 75/28 (2006.01); F02B 23/02 (2006.01); F02B 25/08 (2006.01)
CPC F02B 25/08 (2013.01) [F02B 23/02 (2013.01); F02B 75/28 (2013.01)] 3 Claims
OG exemplary drawing
 
1. 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.