Patent ID: 6988831

Claim:
A bearing structure, comprising: an inner ring; an outer ring coaxially disposed on the outer periphery of said inner ring; a rolling element rollably sandwiched between said inner ring and said outer ring; a supporting part of said inner ring integrally formed with and protruding axially from said inner ring; wherein, said inner ring being capable of supporting a first member on its inner periphery; said outer ring being capable of supporting a second member on its outer periphery in a relatively rotatable manner to said first member; said supporting part being capable of coaxially supporting a third member and also being integrally and coaxially rotatable with said at least one of said inner ring and said outer ring, wherein said supporting part protrudes in a direction of a rotational axis of the bearing structure and is coaxial with a rotational axis of the inner and outer rings, wherein a periphery region of said supporting part to which the third member is being fitted, is concentric with the inner periphery of the inner ring as well as the outer periphery of the outer ring; and wherein the bearing structure is a radial bearing which supports radial loads.