A LOW TORQUE BEARING

摘要

Disclosed in the present invention is a low torque bearing having an improved structure which can prevent the loss of unnecessary torque by changing a design of a sliding contact between the end of a large-end diameter of a roller and an inner ring into a rolling contact. The low torque bearing comprises: an outer ring composed of a first outer ring track surface which is slantly directed inward, and a second outer ring track surface which is concavely bent and directed inward by being separated from the first outer ring track surface in an axial direction; an inner ring composed of a first inner ring track surface which is slantly opposite to the first outer ring track surface, and a second inner ring track surface which is concavely bent and directed inward by being separated in an axial direction from the first inner ring track surface, and is opposite to the second outer ring track surface; a first rolling body row which is included between the first outer ring track surface and the first inner ring track surface; and a second rolling body row which is included between the second outer ring track surface and the second inner ring track surface. The first rolling body row is a taper roller row comprising multiple taper rollers while the second rolling body row is a ball row comprising multiple balls. Thus, the taper roller can be supported by the ball while being in rolling contact without an additional large projection on the inner ring. In addition, the separation of the inner ring and the rolling body can be prevented by removing a small projection on the inner ring and adopting a structure having a first protrusion, thereby enabling the length of the roller to be lengthened. Therefore, torque loss caused by the large projection can be significantly reduced, the manufacture of the low torque bearing can be simple, and the number of taper rollers can be reduced, if necessary, by adopting a long taper roller, in turn, increasing load rating.