Oil passage structure of engine

An oil passage structure of an engine comprising:

• a plurality of cylinders, each of the cylinders containing a piston configured to reciprocate in the cylinder;
• a crankcase;
• a crankshaft rotatably supported in the crankcase via journal bearings, each of which is supplied with oil through a journal portion path connected to a main gallery;
• an engine accessory attached at a first end of the crankshaft, being a dynamo, including a rotor which rotates together with the crankshaft and a stator coil fixedly attached to an engine accessory cover;
• and
• a plurality of connecting rods, a first end of each connecting rod being coupled to the crankshaft and a second end of each connecting rod being coupled to one of the pistons, wherein
• the crankshaft comprises:
• an oil feed passage opened at the first end of the crankshaft;
• an oil passage in communication with the oil feed passage, and allowing therethrough feeding of oil to the first ends of the connecting rods;
• and
• an oil discharge passage in communication with a downstream end of the oil passage, and opened at a second end of the crankshaft,
• the crankshaft is fastened, on the first end thereof with the rotor of the engine accessory, by a fastening bolt,
• the fastening bolt for fastening the engine accessory has the oil feed passage formed therein, and
• the fastening bolt for fastening the engine accessory is in communication, at a head thereof, with an oil reservoir provided to the engine accessory cover which covers the engine accessory.