The teachings herein are related to assemblies, such as oil pan assemblies, including a laminate bottom portion and a nut attached to the laminate bottom portion. The nut may provide a sealable opening to a cavity of the assembly. The laminate bottom portion preferably includes a polymeric layer sandwiched between two metallic layers. The nut preferably is a clinch nut.

A two-part oil pan for an internal combustion engine has a box portion and a pan portion. The pan portion forms a floor of the oil pan and the box portion forms a pan wall of the oil pan. On a peripheral edge having a peripheral first sealing surface on the pan portion and a peripheral second sealing surface on the box portion, the box portion and the pan portion are interconnected in a sealed manner by means of first connection means. The pan portion and the box portion additionally are interconnected by at least one second connection means which is arranged within the edge and additionally at a distance from said edge.

An internal combustion engine includes a bottomed box-shaped oil pan in which oil is stored. In addition, the internal combustion engine includes an oil pump configured to suck the oil in the oil pan and pressure-feed the oil to each part of the internal combustion engine. A suction pipe extends toward a bottom surface of the oil pan from the oil pump. A strainer is attached to a tip end of the suction pipe. A projection portion protrudes from a bottom surface which is one of inner wall surfaces defining an oil storing space inside the oil pan. The resonance frequency of the projection portion falls in the range of frequency of vibration that is generated at an engine rotational speed at which the internal combustion engine continues to operate independently.

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.

In a vehicle lower portion structure, a plurality of cross members are suspended along a vehicle width direction between a pair of side rails. Further, an oil pan guard is suspended along a longitudinal direction between a No. 2 cross member and a No. 3 cross member to protect an oil pan of a transmission from below. When a vehicle collides on its front, engagement between the oil pan guard and the cross member is released, to thereby prevent a decrease in the amount of collision energy to be absorbed by the pair of side rails.

A work vehicle includes an engine, an intake passage through which combustion air flows from an ambient air inlet to an engine, an air cleaner for removing dust contained in the combustion air, a throttle valve for adjusting an intake amount of the combustion air by the engine, a blowby gas returning passage for returning blowby gas discharged from the engine to a mid portion of the intake passage, and an inclined passage portion that assumes a progressively downwardly inclined posture to be located at a lower position on downstream side in a flow direction, the inclined passage portion having a water draining portion at its lowermost end.

An internal combustion engine includes a bottomed box-shaped oil pan in which oil is stored. In addition, the internal combustion engine includes an oil pump configured to suck the oil in the oil pan and pressure-feed the oil to each part of the internal combustion engine. A suction pipe extends toward a bottom surface of the oil pan from the oil pump. A strainer is attached to a tip end of the suction pipe. A projection portion protrudes from a bottom surface which is one of inner wall surfaces defining an oil storing space inside the oil pan. The resonance frequency of the projection portion falls in the range of frequency of vibration that is generated at an engine rotational speed at which the internal combustion engine continues to operate independently.

An engine with an engine casing and a dipstick. The dipstick extends into the engine casing and has a free end. The design of the free end may be selected such that the natural frequency of the dipstick does not resonate with the operating frequency of the engine. The dipstick may also be oriented such that the free end does not contact the engine.

The teachings herein are related to assemblies, such as oil pan assemblies, including a laminate bottom portion and a nut attached to the laminate bottom portion. The nut may provide a sealable opening to a cavity of the assembly. The laminate bottom portion preferably includes a polymeric layer sandwiched between two metallic layers. The nut preferably is a clinch nut.

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.