Bearing and direct current motor

The invention discloses a bearing and a direct current motor. The bearing comprises an outer ring, an inner ring and balls located between the outer ring and the inner ring, wherein first insulating coatings are arranged on the surfaces of the balls. According to the bearing, an electric insulation unit is arranged between the outer ring and the inner ring so that the outer ring and the inner ring can be electrically insulated, the electric conduction of the inner ring and the outer ring of the bearing can be thoroughly isolated, and the service life of the bearing is ensured. 本发明公开了一种轴承以及直流电机，包括：外圈、内圈和位于所述外圈和所述内圈之间的滚珠；所述滚珠的表面设置有第一绝缘涂层。本发明中的由于在外圈和内圈之间设置有电绝缘单元，能够使得外圈和内圈之间电绝缘，因此，能够彻底隔绝轴承内圈与外圈的导电，确保轴承使用的寿命。