US 12,104,525 B2
Opposed-piston engine
Keita Suzuki, Tokyo (JP); Yuki Koshiba, Tokyo (JP); Kengo Tanaka, Tokyo (JP); Shintaro Shuto, Tokyo (JP); Masafumi Mori, Tokyo (JP); Shigetoshi Sugata, Tokyo (JP); and Takashi Ueda, Akashi (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 18/278,754
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Mar. 22, 2022, PCT No. PCT/JP2022/012971
§ 371(c)(1), (2) Date Aug. 24, 2023,
PCT Pub. No. WO2022/202746, PCT Pub. Date Sep. 29, 2022.
Claims priority of application No. 2021-053560 (JP), filed on Mar. 26, 2021.
Prior Publication US 2023/0392544 A1, Dec. 7, 2023
Int. Cl. F02B 75/28 (2006.01); F02B 25/08 (2006.01); F02M 61/14 (2006.01)
CPC F02B 75/28 (2013.01) [F02B 25/08 (2013.01); F02M 61/14 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An opposed-piston engine, comprising:
a cylinder;
a one-side piston disposed inside the cylinder on one side in an axial direction; and
an other-side piston disposed inside the cylinder on another side in the axial direction,
wherein a top surface of the one-side piston has a one-side cavity recessed in a central portion,
wherein a top surface of the other-side piston has an other-side cavity recessed in a central portion,
wherein an outer peripheral edge of the one-side cavity is at least 0.1D1 away from an outer peripheral edge of the top surface of the one-side piston over the entire circumference,
where D1 is a diameter of the top surface of the one-side piston,
wherein an outer peripheral edge of the other-side cavity is at least 0.1D2 away from an outer peripheral edge of the top surface of the other-side piston over the entire circumference, where D2 is a diameter of the top surface of the other-side piston,
wherein the one-side piston has a one-side fuel injection groove extending from the outer peripheral edge of the one-side cavity to the outer peripheral edge of the top surface of the one-side piston, and
wherein the one-side fuel injection groove has a higher groove height on an upstream side in a flow direction of a swirl flow formed inside the cylinder than on a downstream side in the flow direction of the swirl flow.