INTERNAL COMBUSTION ENGINE

摘要

A technique for making air less likely to enter a strainer in an internal combustion engine in which the strainer is supported by a drain bolt. In an internal combustion engine in which a drain bolt supports a strainer and is configured to discharge a drain is attached to a bottom of a sump. A drain hole into which the drain bolt is screwed and a strainer hole are arranged coaxially. A crankcase is provided with an oil passage through which oil is returned to the sump. The oil passage includes a first passage through which the oil flows in a direction away from the strainer, a return passage that turns around from a forefront end of the first passage, and a second passage through which the oil flows from a forefront end of the return passage toward the strainer.

主权项

1. An internal combustion engine comprising:
a sump to pool oil being formed in a lower portion of a crankcase, a strainer housed in the sump with a strainer hole into which the strainer is insertable from below, said strainer hole being provided in a ceiling of the sump, a drain bolt supports the strainer with a drain being attached to a bottom of the sump, and a drain hole into which the drain bolt is screwed and the strainer hole are arranged coaxially; a partition wall is provided in the sump for partitioning the sump into upper and lower sides; the strainer is attached to the lower side below the partition wall; and a lower surface of the partition wall is provided with a slope in a front-rear direction or a left-right direction.