Abstract: An oil pan separator 132 is disposed so as to divide a space within an oil pan 130 into a first chamber 30a and a second chamber 30b. The oil pan separator 132 has a protrusion 132b formed at a low position in such a manner that a portion of the first chamber 30a protrudes into the second chamber 30b. A protrusion upper-plate 132b1, which serves as an upper end portion of the protrusion 132b, is provided with an oil feed valve 138, which is a one-way valve, for allowing substantially only outflow of oil from the first chamber 30a to the second chamber 30b.

Abstract: An oil pan (130) comprises an oil pan cover (131) storing oil in an internal space and an oil pan separator (132) positioned in the internal space. The oil pan separator (132) is positioned so as to divide the internal space into a first chamber (30a), which has an oil strainer (41) at its bottom, and a second chamber (30b), which is adjacent to the first chamber (30a). The oil pan separator (132) includes a slope plate (132c) for capturing return oil that flows back from a cylinder block (20a) to an oil pan (130). Part of the captured return oil flows to the second chamber (30b) via a communication hole (132f) that is provided in the slope plate (132c). The remaining captured return oil flows into the first chamber (30a). This ensures that the oil level in the second chamber (30b) is higher than that in the first chamber (30a). Therefore, when a solenoid valve (133) opens at the end of a warm-up operation, the oil in the second chamber (30b) flows into the first chamber (30a).

Abstract: An oil pan separator 132 is disposed so as to divide a space within an oil pan 130 into a first chamber 30a and a second chamber 30b. The oil pan separator 132 has a protrusion 132b formed at a low position in such a manner that a portion of the first chamber 30a protrudes into the second chamber 30b. A protrusion upper-plate 132b1, which serves as an upper end portion of the protrusion 132b, is provided with an oil feed valve 138, which is a one-way valve, for allowing substantially only outflow of oil from the first chamber 30a to the second chamber 30b.