A structural frame is provided. The structural frame includes a bottom surface, first and second cylinder block sidewall engaging surfaces, the first and second cylinder block sidewall engaging surfaces positioned above the bottom surface at a height that is above a centerline of a crankshaft support included in a cylinder block when the structural frame is coupled to the cylinder block.

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.

A lubrication system includes an engine oil pump, a lubricating oil tank, a breathing pipe, a machine body, and an oil pan. The engine oil pump is formed by superposing upper and lower layers being a lubricating pump and an oil return pump. An oil inlet of the oil return pump leads to a cavity of the oil pan, and an oil outlet leads to an interior of the lubricating oil tank. An oil inlet of the lubricating pump leads to the interior of the lubricating oil tank, and an oil outlet leads to a machine filter. The machine filter is communicated with a main oil path of the machine body. An oil tank cover of the lubricating oil tank is provided with a breathing one-way valve and an oil filling port. The breathing one-way valve communicates one end of the breathing pipe, and the other end thereof communicates a crankcase.

A straddle vehicle includes: a prime mover; a hydraulically actuated main clutch; an oil control valve unit; a power unit case accommodating at least the main clutch; an oil pan mounted beneath the power unit case; a clutch-dedicated pump; a primary filter disposed in an oil passage between the oil pan and the clutch-dedicated pump; and a secondary filter disposed in an oil passage between the clutch-dedicated pump and the oil control valve unit. The primary filter and the secondary filter are mounted on a bottom surface of the power unit case and covered from below by the oil pan.

An inverted non-stop apparatus includes a lubricating system and a breathing system. The lubricating system includes a machine body, an engine oil pump, and an oil pan. A cavity of the oil pan is divided into an oil collection groove and an oil tank body. A flange is provided to form an enclosed lubricating oil tank. The engine oil pump is a double pump including a lubricating pump and an oil return pump. An oil suction port of the oil return pump is connected to the bottom of the oil collection groove, and an oil outlet is connected to the lubricating oil tank. An oil inlet of the lubricating pump is connected to the lubricating oil tank, and an oil outlet is communicated with a main oil path of the machine body. A breathing one-way valve and an air pressure relief valve are provided on the oil tank cover.

An internal combustion engine unit including an internal combustion engine body, a balancer device attached to a lower portion of the internal combustion engine body, and an oil pan attached to the lower portion of the internal combustion engine body so as to surround the balancer device. The balancer device is disposed facing an outlet of an oil outflow hole, and the oil outflow hole is formed in the internal combustion engine body so as to return a lubricating oil in the internal combustion engine body to the oil pan.

An inverted non-stop apparatus of a multi-cylinder diesel engine for a free-fall lifeboat is provided. The apparatus includes a lubricating system and a breathing system. The lubricating system includes a machine body (101), an engine oil pump, and an oil pan (118). The breathing system is a diesel engine breather. A partition board (1181) is transversely provided in the oil pan (118) to divide a cavity of the oil pan (118) into a left cavity and a right cavity. The left cavity is an oil collection groove (1182), and the right cavity is an oil tank body (127A). A flange is provided at an opening of the oil tank body (127A) for fixing an oil tank cover (125) to form an enclosed lubricating oil tank (127). The engine oil pump is a double pump having oil inlets and outlets independent separately, which is formed by superposing upper and lower layers, wherein the upper layer is a lubricating pump (111) and the lower layer is an oil return pump (112). An oil suction port (114) of the oil return pump (112) is connected to the bottom of the oil collection groove (1182), and an oil outlet is connected to the lubricating oil tank (127). An oil inlet of the lubricating pump is connected to the lubricating oil tank (127), and an oil outlet is communicated with a main oil path (102) of the machine body. A breathing one-way valve (132) and an air pressure relief valve (131) are provided on the oil tank cover (125). The inverted non-stop apparatus of a multi-cylinder diesel engine for a free-fall lifeboat separate an engine oil collection function and an engine oil storage function borne by an oil pan of a diesel engine, so that no matter the diesel engine is longitudinally and transversely turned over and inverted, the diesel engine can operate normally.

An object of the present invention is to simplify portions of an oil supply passage which portions are formed at a cylinder block. An oil supply device according to the present invention includes a cylinder block, an oil pan, an oil pump, and an oil filter. Wall portions of the oil pan are coupled to wall portions of the cylinder block. An oil filter is attached to the oil pan. An upstream oil supply passage through which the oil filtrated by the oil filter flows is formed at the oil pan. A downstream oil supply passage including a main gallery extending in a cylinder column direction is formed at the cylinder block. A first communication passage through which the main gallery and the upstream oil supply passage communicate with each other is formed at the wall portion of the cylinder block and the wall portion of the oil pan.

A cooling lubrication system comprises a dry sump, an oil tank, and a pump system that operates an oil circuit in which an oil pump delivers oil from the dry sump into the oil tank, and the pump system comprises a vane cell pump and a gerotor pump on a shaft.

A cooling lubrication system comprises a dry sump, an oil tank, and a pump system that operates an oil circuit in which an oil pump delivers oil from the dry sump into the oil tank, and the pump system comprises a vane cell pump and two gerotor pumps on a shaft.