To provide a roll bearing for an auxiliary machine component, which roll bearing can suppress its brittle separation.

The roll bearing for the auxiliary machine components to be driven via a belt by means of an internal engine has rolling elements, such as balls and rollers, to be arranged between an inner race and an outer race, wherein the rolling elements have a dimpled shape. The space between the inner race and the outer race is filled with lubricating grease, and oil films of the grease are secured between the inner race and the balls or between the outer race and the balls. The belt drive by means of the internal combustion engine is carried out, for example, by means of a V belt. In this case, the serpentine system is used to drive a plurality of auxiliary machine components by means of a belt.