The present disclosure describes an oil pan structure including a storing portion that stores oil for an internal combustion engine. The storing portion includes a shallow bottom portion, a deep bottom portion deeper than the shallow bottom portion, and a connection surface that connects the shallow bottom portion and the deep bottom portion between the shallow bottom portion and the deep bottom portion. A side wall is formed at a position facing the connection surface with the shallow bottom portion interposed between the side wall and the connection surface. A rib is formed on a back surface of the shallow bottom portion so as to extend from one side or another side of the side wall in a width direction of the shallow bottom portion toward an end portion of the connection surface on an opposite side in the width direction.

This application discloses a cylinder block structure including: a cylinder block surrounding a cylinder array formed by a plurality of cylinders lined up in a first direction; a reinforcement plate including: a first fastening portion fastened to the cylinder block; and a second fastening portion fastened to the cylinder block at a position separated from the first fastening portion in a second direction that intersects with the first direction; and an oil pump that supplies oil to the cylinder block. The oil pump is fastened to the cylinder block together with the reinforcement plate. The reinforcement plate is interposed between the cylinder block and the oil pump, and has a length that is equal to or more than half of the cylinder array in the first direction.

To achieve an improved stiffness, the oil pan includes bottom wall having a shallow bottom wall (16), a deep bottom wall (17), and a connecting wall (18) located between the shallow bottom wall and the deep bottom wall, arranged in a lateral direction, and a side wall extending from a peripheral edge of the bottom wall. The side wall includes a first side wall (11) located on a front side of the bottom wall and a second side wall (12) located on a rear side of the bottom wall, the connecting wall being provided with a first rib (31) extending in a fore and aft direction and connecting the first side wall and the second side wall to each other.

To achieve an improved rigidity, the an oil pan (3) for forming a lower end part of an internal combustion engine (1) comprises a bottom wall (6) and a side wall (7) extending from a peripheral edge of the bottom wall, wherein the bottom wall includes a pair of first planar surface portions (35) extending in a lateral direction and provided on either end of the bottom wall with respect to a fore and aft direction orthogonal to the lateral direction, and a curved surface portion (36) recessed downward with respect to the first planar surface portions.

A structure of an internal combustion engine is provided. The structure includes an oil pan connected to a main body portion of the internal combustion engine, and a plurality of baffle plates disposed in and fastened to the oil pan. In one embodiment, the oil pan includes a deep bottom portion for receiving oil and a shallow bottom portion. Among the plurality of baffle plates, the rigidity of a baffle plate disposed at the shallow bottom portion is higher than the rigidity of a baffle plate disposed at the deep bottom portion. In another embodiment, the oil pan includes a bottom portion for receiving oil, and a heavy-equipment joint portion disposed on a side portion of the oil pan. Among the plurality of baffle plates, the rigidity of a baffle plate disposed at the heavy-equipment joint portion is higher than the rigidity of another baffle plate.

An oil pan for trapping oil of an engine comprising: a curved portion connecting a flat portion and a side wall portion and including a rib-free region where a first reinforcing rib provided on the flat portion and a second reinforcing rib provided on the side wall portion are not connected to each other.

This application discloses a cylinder block structure including: a cylinder block surrounding a cylinder array formed by a plurality of cylinders lined up in a first direction; a reinforcement plate including: a first fastening portion fastened to the cylinder block; and a second fastening portion fastened to the cylinder block at a position separated from the first fastening portion in a second direction that intersects with the first direction; and an oil pump that supplies oil to the cylinder block. The oil pump is fastened to the cylinder block together with the reinforcement plate. The reinforcement plate is interposed between the cylinder block and the oil pump, and has a length that is equal to or more than half of the cylinder array in the first direction.

The oil pan assembly includes an oil pan and a slideable cover. The oil pan includes a base and a sidewall which surrounds the base wherein the base and the sidewall are configured to retain a pool of oil. The oil pan further includes a peripheral flange operatively configured to be coupled to an engine block. The slideable cover is affixed to the oil pan and is configured to maintain the pool of oil proximate to the base of the oil pan.

An oil sump is provided, including a bottom wall and a lateral outer wall, which in the assembled condition of the oil sump extends upwards from the bottom wall, as seen in the direction of gravity, and an oil storage region, which is arranged in an interior of the oil sump and, when the oil sump is in operation, is filled with oil up to a storage level, wherein the oil sump is better able to withstand heat and flame. The oil sump includes an oil cooling region, which is adjacent to the lateral outer wall and is filled with oil to a cool level, and a decoupling device for decoupling the cool level of the oil in the oil cooling region from the storage level of the oil in the oil storage region in a cool condition of the oil sump.

An oil pan guard bracket for securing an oil pan guard to a vehicle body frame includes a flat securing base to which the oil pan guard is secured and two inclined wall portions, each of which extends obliquely upwards and outwards from opposite sides of the flat securing base. Each inclined wall portion includes an opposing edge which opposes a side surface of the vehicle body frame. The opposing portion of each inclined wall portion is welded to the side surface of the vehicle body frame.