| 摘要 |
PROBLEM TO BE SOLVED: To improve defective painting and improve the quality of painting by forming an angle at which a tangential line described by a continuous peripheral wall part of a part which is continuous with an upper peripheral wall part positioned on more upper side than a curved peripheral wall part is inclined in the upward direction for a horizontal line. SOLUTION: An oil pan 2 is hoisted by a hook for painting 20 and is immersed in a paint liquid. At this time, a continuous peripheral wall part 24 is formed and provided in such a manner that an angleθ3 at which a tangential line L1 described by the continuous peripheral wall part 24 of a part in which a curved peripheral wall part 12 is continuous with an upper peripheral wall part 22 is inclined in the upward direction for a horizontal line Lh is formed. The continuous peripheral wall part 24 is not arranged in a shape in which it protrudes upward for the upper peripheral wall part 22 which overhangs in the paint liquid. Consequently, it is possible to prevent air from remaining on a lower side of the continuous peripheral wall part 24. As a result, it is possible to reduce the quality control works and reduce cost of an oil pan device of an internal combustion engine.
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