| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a thrust ball bearing capable of achieving a small size and a light weight by reducing a width in radial direction compared with a roller, and achieving a low torque by holding a rolling body in one side or both sides. <P>SOLUTION: The thrust ball bearing includes raceway rings (an outer diameter raceway ring 2 and an inner diameter raceway ring 4), a plurality of balls 6 and a retainer 8. The raceway rings include: annular raceway flat portions (an outer diameter-side flat portion 2a and an inner diameter-side flat portion 4a) where raceway faces (an outer diameter-side raceway face 2s and an inner diameter-side raceway face 4s) are formed; and cylindrical portions (an outer diameter-side cylindrical portion 2b and an inner diameter-side cylindrical portion 4b) axially extending from circumference edge portions of the raceway flat portions. The retainer includes an annular retainer flat portion 8a having an outer diameter smaller than the inner diameter of the outer diameter-side cylindrical portion and having an inner diameter larger than the outer diameter of the inner diameter-side cylindrical portion, and a plurality of windows 80. An extended circumference edge is protruding each of the outer diameter-side cylindrical portion and the inner diameter-side cylindrical portion so as to form a projection (an outer diameter-side projection 2c and an inner diameter-side projection 4c) that can engage with circumference edges (outer circumference edge 8b and an inner periphery edge 8c) of the retainer flat portion. Thereby, the raceway rings, the retainer and balls can be rotated relative to one another and are integrated as inseparable. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
