| 摘要 |
The arrangement provides a device for lubricating rolling element bearings inside a reciprocating engine crankcase where it is desired to exclude lubricating oil from the crankcase. The engine has a crankshaft 1 rotating about an axis 2 and supported by rolling element main bearings 3 and a connecting rod 4 attached to the crankshaft by rolling element big end bearing 5. The crankshaft includes an oil inlet manifold 8 and an oil outlet manifold 10, each fitted with seals around the crankshaft and which exclude oil from entering the engine crankcase. Pressurised oil is directed from the supply manifold via a duct 6 within the crankshaft to the oil outlet manifold, en-route providing lubrication to the bearings via orifices 14, 15. The oil supply can be supplied intermittently, under the control of a controller. The arrangement finds application in two-stroke engines that use the crankcase as an air pump, and in four-stroke engines used in situations where the engine may be inverted in use.
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