Bearings and rod ends requiring maintenance
SKF steel/steel radial spherical plain bearings are made of bearing steel and are through-hardened. The high-strength sliding contact surfaces are phosphated and treated with a special running-in lubricant. These bearings are used primarily in applications where there are:
- heavy static loads
- heavy alternating loads
- shock loads
They are also relatively insensitive to contaminants and high temperatures.
The SKF multi-groove systemStandard steel/steel radial spherical plain bearings that must accommodate minor alignment movements under very heavy, constant direction loads are prone to lubricant starvation. Lubricant starvation is a common cause of peremature bearing failure in applications where minor movements are made under heavy, constant direction loads. To improve and maximize the effects of the lubricant under these conditions, SKF has developed the multi-groove system. Metric bearings have the multi-groove system on the sliding surface of the outer ring (fig. 1) and inch bearings have it on the sliding surface of the inner ring (fig. 2). Bearings with the multi-groove system are identified by the designation suffix ESL.
The lubrication grooves provide the following benefits:
- improved lubricant supply to the loaded zone (fig. 3)
- enlarged lubricant reservoir in the bearing (fig. 4)
- enable relubrication under load
- extended relubrication intervals
- space for wear particles and contaminants
- extended grease life
The main benefit of the multi-groove system is that it improves lubricant distribution in the heavily loaded zone to extend service life and/or maintenance intervals.