CONICAL ROLLING-ELEMENT BEARING AND METHOD FOR MANUFACTURING A CAGE FOR A CONICAL ROLLING-ELEMENT BEARING

摘要

A tapered roller bearing having construction that improves durability during a state of insufficient lubrication by sufficiently lengthening the time until rotation becomes impossible due to seizure. Oil retaining concave sections 19 that are recessed outward in the radial direction are formed in portions on the inner circumferential surface of the large-diameter rim section 12 e of the retainer 5e whose phase in the circumferential direction coincides with the pockets 15e. The portion of the bottom surface of each of the oil retaining concave sections 19 that is open to the inside surface of the pocket 15e face concave section 20 that is formed in the end surface 10 on the large-diameter side of tapered roller 4a that is held inside the pocket 15e. When lubrication becomes insufficient, lubrication oil that remains in the oil retaining concave sections 19 is effectively used for lubricating areas of sliding contact between the end surfaces 10 on the large-diameter side and the inside surface in the axial direction of a large-diameter side flange section 8.