Radial thrust bearing

A radial thrust bearing that receives a load in a radial direction and a load in a thrust direction, the radial thrust bearing comprising:

• a plurality of radial rolling elements that are subjected to the load in the radial direction;
• a radial cage that holds the plurality of radial rolling elements;
• a plurality of thrust rolling elements that are subjected to the load in the thrust direction;
• a thrust cage that holds the plurality of thrust rolling elements;
• an outer ring including a first outer ring raceway surface that contacts rolling surfaces of the radial rolling elements;
• and
• an inner ring including a first inner ring raceway surface that contacts the rolling surfaces of the radial rolling elements, wherein
• the outer ring includes a second outer ring raceway surface that contacts rolling surfaces of the thrust rolling elements,
• the inner ring includes a second inner ring raceway surface that contacts the rolling surfaces of the thrust rolling elements,
• the outer ring has a through hole that reaches a raceway region of the plurality of radial rolling elements from outside,
• the radial cage includes
• a pair of annular portions disposed at an interval in an axial direction, and
• a plurality of pillar portions coupled to the pair of annular portions and disposed at an interval in a circumferential direction to form pockets that house the radial rolling elements,
• radially outer surfaces of the pillar portions include grooves each extending in the axial direction and recessed radially inward, and
• each of the grooves has an opening at least one axial end of a corresponding one of the pillar portions.