| 摘要 |
PROBLEM TO BE SOLVED: To prevent a cylindricity of each bearing receiving surface from impairing by arranging a bearing receiving cap installed in a block side bearing part, and setting a length between first and second matching surfaces of the block side bearing part smaller thin the length between first and second matching surfaces of the bearing cap. SOLUTION: In a cylinder block 4, a cylinder sleeve 20 is pressed into a barrel part 12 provided with a skirt part 14 on a lower part, and a piston is slidably fitted to the cylinder sleeve 20. A crank bearing part 30 is arranged on the skirt part 14 in a direction intersected with a crank axis C between side skirt wall parts 26, 28, and a crankshaft 34 is journalled to the bearing part 30 between the bearing part 30 and a bearing cap 32. A length A between first and second matching surfaces 54 and 62 of the crank bearing part 30 formed as a block side bearing part is set smaller than a length B between first and second matching surfaces 68 and 76 of the bearing cap 32. It is thus possible to prevent cylindricity of each bearing surface 52, 66 from impairing, when the bearing cap 32 is fastened.
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