Patent ID: 7891472

Claim:
A suspension bearing comprising: a primary ring defining an annular primary raceway surface; a secondary ring defining an annular secondary raceway surface, the secondary ring being coaxial with the primary ring; a plurality of rolling elements supported between the primary and secondary raceway surfaces; a primary engagement portion formed on the primary ring so as to protrude in a radial direction thereof toward the secondary raceway surface and extend in a circumferential direction of the primary raceway surface over a predetermined angle range; and a secondary engagement portion formed on the secondary ring so as to protrude in the radial direction toward the primary raceway surface and extend in a circumferential direction of the secondary raceway surface over a predetermined angle range, the secondary engagement portion being formed integrally with the secondary raceway surface, wherein the secondary engagement portion is brought into contact with the primary engagement portion to produce a frictional force for increasing a rotational torque within a specific relative rotation angle of the primary and secondary rings when the secondary ring rotates relative to the primary ring, and wherein the secondary engagement portion is brought out of contact with the primary engagement portion within another specific relative rotation angle of the primary and secondary rings when the secondary ring rotates relative to the primary ring.