In the case where the oil seal cannot be installed due to space constraints, the open-end or closed-end oil-sealed drawn cup needle roller bearings (3 to 5) are available.
These bearings are equipped with a polyurethane or synthetic rubber friction seal that is filled with a lithium-based grease with good rust resistance and is suitable for operating temperatures from -20 to +100 °C.
The inner ring of the oil-sealed bearing is 1mm wider than the outer ring. This makes the bearing work well in the case of a slight displacement of the bearing shaft relative to the bearing housing and avoids contamination of the bearing.
The inner ring of the bearing also has lubrication holes, which can be relubricated by the outer ring or the inner ring according to the needs of the bearing arrangement. Combined needle bearing