The multi-groove system Standard steel-on-steel spherical plain bearings manufacturer that have to perform minor alignment movements under very heavy, constant direction loads have a lubricant starvation problem. The SKF multi-groove system is the answer to this.The multi-groove system• improves lubricant supply to theloaded zone,• enlarges the lubricant reservoir in thebearing,• enables relubrication under load, • permits extended relubrication inter-vals and • provides space for wear particles andcontaminants to be depositedAll in all the system improves lubri-cant distribution in the heavily loaded zone and thus extends the service life and/or maintenance intervals.

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Product data Design features Page ..............16Page ..............57

When flexibility pays

Mature, well-proven designs SKF spherical plain bearings and rodends should be the first choice for total design economy. These state-of-the- art products are stocked in a wide range of designs, dimension series and sizes. Whether a large bearing is required,or a small maintenance-free rod end – both are available from SKF and offer:• long service life,• simple maintenance and • high operational reliability.Easy replaceability is also providedas all SKF spherical plain bearings and rod ends are standardized products. Their worldwide availability goes with- out saying – thanks to the global SKF sales organisation.It is not just total economy considera-tions thatpoint to SKF spherical plain bearings and rod ends, butalso their unparalleled design characteristics. Some of the advantages are outlined in the following. SKF spherical plain bearings and rod ends offer the performance to meet application demands. The designs, materials and manufacturing qualityhave been selected for long servicelives and reliability. “Fit and forget” is a philosophy embraced by SKF. Easily maintainable sliding contactsfor heavy loads SKF steel-on-steel spherical plain bearings have high-strength sliding contact surfaces of carbon chromium (rolling bearing) steel which are phos- phated and treated with a special running-in lubricant. Their prime areas of use are where • heavystatic loads and • heavyalternating loads and • high-frequency alignment or oscil-lating movements occur. They are also relatively insensitive tocontamination and high temperatures. These advantages come at a price – in this case the need for maintenance.Therefore, lubrication holes andgrooves are provided in both the inner and outer rings of all bearings – withthe exception of a few small sizes – to facilitate relubrication. To further en-hance lubrication, all bearings havingan outside diameter of 150 mm and above incorporate the “multi-groove system” in the sliding surface of the outer ring.SKF steel-on-bronze rod ends alsorequire maintenance, although require- ments are less stringent than for steel- on-steel rod ends, as the emergency running properties are better.
Radial sphericalplain bearing Angular contact spherical plainbearing Spherical plain thrust bearing Rod end withfemale thread Rod end with malethreadRod end withwelding shank 6