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Oil-hole details

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The fatigue behaviour of a crankshaft is dictated by the service loads it is expected to cope with, its manufacture and its geometry. In numerous articles concerning crankshafts, surface treatments and materials, RET-Monitor has stressed the critical importance of compressive residual stresses for increasing fatigue life, and it is here that the correct selection of material, heat treatment and further processing is of utmost importance. In terms of geometry, there are two types of...

Further thoughts on Crankshaft Oiling

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The previous article looked at the recent trend in crankshaft lubrication commonly known as the 'nose-feed' method. In that article, the basics of the concept were explained, along with some of the perceived advantages of using this method of providing lubrication to the connecting rod big ends and possibly the crankshaft main bearings too. When feeding the connecting rod's big-end bearings with oil in the 'conventional' manner of pumping in oil via the main bearing...

Crankshaft Oiling

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In a previous article discussing the oil holes which are necessary in crankshafts, the author briefly discussed one of the methods by which oil is transferred to the crankpins for the purpose of lubricating the big end of the con rod and its bearings. The article discussed how the oil, having arrived at the main bearing, must make its way through the crankshaft via the oil drillings to the crankpin. We touched briefly on compound-angle drillings and axial drillings in that article, but...

Applying Matinaglia's good advice

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In the author's article on the mitigation of stress concentration in critical areas of crankshafts last month (Crankshafts: Stress-concentration mitigation), we mentioned the 1943 paper by Matinaglia. Some of his findings are repeated in the books by C.F. Taylor, which, if you don't have a copy of these, you would do well to avail yourself of. The paper by Matinaglia is worth reading but, having been published many decades ago in a trade journal, is not easy to get sight of. The...

Crankshafts: Stress-concentration mitigation

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In previous articles on the subject of crankshafts, we have touched on the benefits of compressive residual stresses. Two methods by which this might be introduced have been discussed, these being nitride hardening (nitriding) and fillet rolling, although there are many others, some of which will be discussed at a later date. By imparting these residual stresses to the surface of the material, there is a large increase in fatigue strength, which gives a greater factor of safety against...