The ornamental design for a pivot bearing, as shown and described.
FIG. 1 is a view of a first embodiment of a pivot bearing showing a right side pivot bearing; a second embodiment of the pivot bearing is a left side pivot bearing (not shown) being a mirror image of all of the views herein and also falling within the claimed design.
FIG. 2 is an inboard side view of the pivot bearing of FIG. 1;
FIG. 3 is a front side view of the pivot bearing of FIG. 1;
FIG. 4 is a top view of the pivot bearing of FIG. 1;
FIG. 5 is an outboard view of the pivot bearing of FIG. 1;
FIG. 6 is a bottom view of the pivot bearing of FIG. 1; and,
FIG. 7 is a rear view of the pivot bearing of FIG. 1.
The drawings contain broken line showings of boundaries that form no part of the design to be patented (e.g., apertures for mounting the pivot bearing to other vehicle suspension components or mounting a wheel or other components to the pivot bearing).