| 摘要 |
PURPOSE:To make lubrication for bearings performable in a sufficient manner even in time of operation at low speed, by installing a larger outer diametral rotor than the minimum outer diameter of a crankshaft, in a lower end of the crankshaft and thereby letting it perform a pumping action. CONSTITUTION:Simultaneously with rotation in a crankshaft 14, a rotor 26 being larger in its outer diameter than the minimum outer diameter of the shaft 14 and locked concentrically to the lower end of the crankshaft 14 with a bolt or the like is also rotated, while oil, as shown in a full line in illustration, is sucked inside a lubrication hole 27 from the lower end of the rotor 26 and then blown off inside a housing 28. And, passing through a lubrication hole 29 to be formed between each of fins 29a of an inner wall of the housing 28, oil is led into a lubrication hole 15' whose upper end is opened to each bearing inside the crankshaft 14. With this constitution, the outer diameter of the rotor 26 is made into such a rotor outer diameter amply as required whereby even at time of operation at low speed by means of an inverter or the like, lubrication to each bearing part can be sufficiently carried out.
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