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EC GA | You raise a good question, that I haven't found a good answer too. I do know that thermal loads during operation require different bearing preloads, depending on which part is getting the hottest and expanding more. In axle ends, the hub will often be hotter than the spindle during high speed operation so the bearing preload is set a tiny bit loose, and automatically tightens when it warms up. In the G56 transmissions in Dodge trucks, a lot of them were destroyed because of improper bearing preload. They had aluminum cases, which would grow longer at operating temps and the bearings would run loose. Dissimilar metals and thermal differences make proper clearances as much art as science. The American thought is to use adjusting nuts, shims, etc to set a desired clearance. The European thought is to use different thickness spacers or snap rings, or quite often, like your JCB, have no way to check or adjust, and assume that the machining of shafts and cases is accurate enough to just put it together. | |
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Tapered Roller bearings
