| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling bearing capable of preventing seizure at an early stage by restraining increase of torque and a heat generation amount while securing high rigidity with respect to a radial load, an axial load and a moment load, and capable of maintaining enhanced lubricating performance for a long time. SOLUTION: A water pump 10 for an automobile is provided with a rotary shaft 14 arranged in a housing 12, a pulley 16 fixed on an end side of the rotary shaft, and an impeller 18 fixed on the other end side of the rotary shaft, and the rotary shaft and the housing are connected through the rolling bearing 2 so as to be relatively rotatable. The rolling bearing is provided with an inner ring constitution section 4 and an outer ring constitution section 6 arranged so as to be relatively rotatable, and a plurality of rolling elements 8a and 8b arranged so as to be freely rolled between raceway surfaces 4s and 6s of the inner and outer ring constitution sections, and the plurality of the rolling elements are constituted by two kinds or more of the rolling elements having different diameters, and a radial clearance of the rolling element having the largest diameter is set to be a negative value and a radial clearance of the rolling element having the smallest diameter is set to be a positive value at least when not being used. COPYRIGHT: (C)2006,JPO&NCIPI
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