Patent ID: 9670872
Date: 2017-06-06
CPC Classifications: F02B,F02F,F16C

Claim:
1. An internal combustion engine comprising a first bearing cap secured to a cylinder block by fastening bolts and a crankshaft rotatably supported by the first bearing cap and the cylinder block, the cylinder block having a cylinder center axis offset relative to a rotation center of the crankshaft, wherein a product of a distance from a center axis of the fastening bolts to the rotation center of the crankshaft and an axial force of the fastening bolts is defined as a bearing cap securing force, when viewed from an axial direction of the crankshaft, a bearing cap securing force on a side toward the cylinder center axis from the rotation center of the crankshaft is larger than a bearing cap securing force on a side away from the cylinder center axis or a side having no cylinder center axis, the first bearing cap is secured by two fastening bolts on the side toward the cylinder center axis while being secured by one fastening bolt on the side away from the cylinder center axis, the first bearing cap has a cylinder block-side contact surface brought into contact with the cylinder block, and a top end surface opposite to the contact surface, the first bearing cap is partially cut out at a cylinder center axis-side end of the top end surface to have a cutout portion at which the first bearing cap is secured to the cylinder block by an outer fastening bolt of the two fastening bolts disposed on the side toward the cylinder center axis, the outer fastening bolt having a distance from the rotation center of the crankshaft larger than a distance of an inner fastening bolt of the two fastening bolts from the rotation center of the crankshaft, and the outer fastening bolt of the two fastening bolts securing the first bearing cap on the side toward the cylinder center axis is smaller in length than the inner fastening bolt of the two fastening bolts.