US 12,241,405 B2
Internal combustion engine and cylinder block
Yasuhiro Ishikawa, Fujisawa (JP)
Assigned to ISUZU MOTORS LIMITED, Yokohama (JP)
Filed by ISUZU MOTORS LIMITED, Yokohama (JP)
Filed on Mar. 19, 2024, as Appl. No. 18/609,612.
Claims priority of application No. 2023-052308 (JP), filed on Mar. 28, 2023.
Prior Publication US 2024/0328344 A1, Oct. 3, 2024
Int. Cl. F02F 1/00 (2006.01); F02B 59/00 (2006.01); F02F 1/20 (2006.01)
CPC F02B 59/00 (2013.01) [F02F 1/20 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An internal combustion engine, comprising:
a cylinder block that includes a cylinder; and
a piston that is stored in the cylinder in a manner capable of reciprocating along an axis line of the cylinder,
wherein
the cylinder includes a multi-bulging inner circumference portion in which a diameter in a thrust-anti thrust direction is a minimal diameter, the multi-bulging inner circumference portion including multiple bulging portions that bulge outward relative to an outer diameter of a virtual cylinder having a perfect circular shape through which the piston passes;
the multi-bulging inner circumference portion is positioned below a position at which a maximal side thrust is received in the cylinder during combustion and expansion strokes; and
the bulging portions are parts having major diameters longer than the minimal diameter and gradually increase downward from the position.