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Aring oiler oroil ring is a form of oil-lubrication system forbearings.
Ring oilers were used for medium-speed applications with moderate loads, during the first half of the 20th century. These represented the later years of thestationary steam engine, and the beginnings of thehigh-speed steam engine, the internal combustionoil engine[1] andelectrical generating equipment.[2] Before this timeplain bearings were lubricated by drip-feedoil cups or manually by anengine tender with anoil can. As speeds or bearing loads later increased, forcedpressure lubrication became more prevalent and the ring oiler fell from use.
A ring oiler is a simple device, consisting of a large metal ring placed around a horizontal shaft, adjacent to a bearing. An oil sump is underneath this shaft and the ring is large enough to dip into the oil. As the shaft rotates, the ring is carried round with it. The rotating ring in turn picks up some oil and deposits it onto the shaft, from where it flows sideways and lubricates the bearings. The oil ring is effectively a simple lubrication pump, with only one moving part and no complex or high-precision components. The device is crude, but automatic, effective and reliable. Unlike a drip oiler, there is also no need to close off the oiler or removeoil wicks when the machine is stopped.
Ring oilers were used for speeds up to around 1,000 rpm.[1] Above this, the oil tended to be thrown centrifugally from the ring, rather than carried by it (although it is still currently applied on steam turbines with speeds around 3200 rpm[citation needed]). The bearing must also remain horizontal and stable, so although suitable for crankshaft main bearings, they could not be used onconnecting rod big end bearings. They were not used on vehicles for similar reasons, although the engines concerned at this time were anyway too large and heavy for practical mobile use. Automatic ring oilers were particularly useful for large engines with multiple horizontally opposed cylinders, where it was otherwise difficult to access the central main bearings.[1] Ring oilers were most suited where bearing side-loads were relatively light, but the bearing capacity required more lubrication than could be supplied by a drip feed oiler. For this reason they were widely used on larger electric motors and generators.[2][3]
