Abstract: A filter having a plurality of filter pores penetrating one surface and another surface of the filter, wherein the filter pore has a first opening on the one surface and a second opening on the another surface, a ratio (L1/W1) of a major axis diameter L1 to a minor axis diameter W1 of the first opening is 1.00 or more and 1.20 or less, the minor axis diameter W1 is 7.0 ?m or more and 9.0 ?m or less, a ratio (L2/W2) of a major axis diameter L2 to a minor axis diameter W2 of the second opening is 1.00 or more and 1.20 or less, and a ratio (W2/W1) of the minor axis diameter W2 to the minor axis diameter W1 and a ratio (L2/L1) of the major axis diameter L2 to the major axis diameter L1 are both 1.20 or more and 1.50 or less.

Abstract: A baffle plate configuration of an internal combustion engine according to a first embodiment of the invention is provided below a rotational member arranged on or near a crankshaft and prevents the rotational members and lubricant in a pan from interfering each other. The baffle plate includes a preventing portion that is provided at an end portion of the baffle plate located in the side that is opposite, in the axial direction of the crankshaft, to the side where a larger amount of lubricant returns to the pan. The preventing portion prevents piston pumping air generated above the baffle plate from entering a space below the baffle plate through the end portion of the baffle plate.

Abstract: A baffle plate configuration of an internal combustion engine according to a first embodiment of the invention is provided below a rotational member arranged on or near a crankshaft and prevents the rotational members and lubricant in a pan from interfering each other. The baffle plate includes a preventing portion that is provided at an end portion of the baffle plate located in the side that is opposite, in the axial direction of the crankshaft, to the side where a larger amount of lubricant returns to the pan. The preventing portion prevents piston pumping air generated above the baffle plate from entering a space below the baffle plate through the end portion of the baffle plate.