| 摘要 |
A bearing comprises a rotating shaft, a sleeve which surrounds the outer wall of the rotating shaft and supports the rotating shaft in such a manner that the rotating shaft is rotatable, and a thrust bearing plate which is fixed to the sleeve and supports one end of the rotating shaft. A first herringbone pattern and a second herringbone pattern are formed either on the rotating shaft or on the sleeve, wherein the first herringbone pattern is located at a first side and the second herringbone pattern is located at a second side, wherein the first side is the side where the thrust bearing plate is located, and the second side is the side opposite the first side. The relation between width-A and width-B in the first herringbone pattern is expressed by 0<(A-B)<0.2x(A+B), where A denotes the dimension from a turning point of the first herringbone pattern to the end thereof in the first side, and B denotes the dimension from the turning point to the end thereof in the second side, and, the relation between width-C and width-D in the second herringbone pattern is expressed by 0 ((D(C) (0.2((D+C), where C denotes the dimension from a turning point of the second herringbone pattern to the end thereof in the first side, and D denotes the dimension from the turning point to the end thereof in the second side. The above structure enables the reduction of the radial runout of the rotating shaft of the bearing and the improvement of the durability of the bearing.
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