Neutron imaging was used for the non-destructive observation of grease fluidity inside ball bearings after rotation testing. Two types of greases with different energy-saving properties were studied. Imaging revealed that adherence of the grease to the rolling elements varied depending on the grease type. This relates to the grease’s energy-saving performance, since adherence of the grease to the rolling elements affects resistance as the bearing rotates. Neutron imaging is a unique technology that enables non-destructive observation of grease fluidity inside bearings and could be an effective tool for developing future energy-saving greases.
