US Patent 7891472 Suspension bearing

A protruding portion is formed integrally on an outer ring in such a manner as to protrude from an outer raceway surface toward an inner raceway surface. A sliding portion is formed on an inner ring as a separate element from the inner raceway surface in such a manner as to protrude from the inner raceway surface toward the outer raceway surface. Due to the sliding portion being brought into contact with the protruding portion during a relative rotation of the inner ring and the outer ring, the sliding portion is formed by applying an elastic material such as rubber to the inner raceway surface by heating or bonding.