Cylinder block structure for V-type engine

A cylinder block structure for a V-type engine that supports a crankshaft, wherein said crankshaft has a plurality of journals, said structure comprising:

• a plurality of bearings for supporting said journals;
• a pair of cylinder banks arranged in a V-shape;
• a valley defined between the banks, wherein the valley extends in the direction of the crankshaft;
• a coolant passage through which coolant flows to cool the cylinder block and which includes said valley;
• first oil passage through which lubricating oil for the engine flows, said first oil passage being arranged to extend along the coolant passage in the longitudinal direction thereof;
• a bearing oil passage for supplying the lubricating oil to one of the journals, wherein said bearing oil passage is formed in one of the bearings, and wherein the bearing oil passage has an exit communicating with an associated one of the journals and an entrance communicating with the first oil passage, and wherein the lubricating oil is introduced to the bearing oil passage via its entrance and is supplied to the journal via its exit;
• a projection provided in the valley, wherein said projection includes an oil cooling passage, such that oil flows from the first oil passage to the oil cooling passage;
• and wherein said oil cooling passage has an opening communicating with the first oil passage;
• and
• wherein said opening is located at a position opposed to the entrance of the bearing oil passage with respect to the first oil passage, and wherein lubricating oil from the first oil passage is supplied to the oil cooling passage when lubricating oil enters the bearing oil passage from the first oil passage.