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Abstract
The highly loaded gyrating contact in the top bearing of a gyratory rock crusher is analyzed and found to operate in the elastohydrodynamic lubrication regime. The analysis is of interest from a number of viewpoints:
(a) The contact rotates around the bush as the crusher gyrates, creating a rolling contact of high speed.
(b) The elliptical contact is aligned with its long axis parallel to the rolling direction, which is unusual.
(c) Due to high loads and large radii, the elastic contact ellipse is very large (39.2 cm × 10.5 cm) by EHL standards.
(d) The calculated film thickness is of the order of 20 μm which is large in EHL terms, but leads to a low λ value of 0.15 when compared with roughness extrapolated to a cut-off length of twice the contact length as recommended in the literature. The bearing has been operating without distress for a year which is at variance with the low λ value.
Presented at the 34th Annual Meeting in St. Louis, Missouri, April 30–May 3, 1979
Notes
Presented at the 34th Annual Meeting in St. Louis, Missouri, April 30–May 3, 1979