| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump device which is reduced in size and in which the number of parts is reduced and the length of a drive shaft is shortened while securing the extraction prevention function of the drive shaft. SOLUTION: The drive shaft 54 is prevented from being extracted by a bearing 51 by restraining the movement of an outer race 51b in the drive shaft axial direction and positioning the bearing 51 and press-fitting and fixing the drive shaft 54 to an inner race 51c. The press-fitting strength of the drive shaft 54 is secured while suppressing an increase in the size of the outer race 51b, i.e., suppressing an increase in the size of the pump device 100 by increasing the length of the inner race 51c more than that of the outer race 51b. Consequently, the pump device 100 can be reduced in size while increasing the reliability of the extraction prevention. COPYRIGHT: (C)2008,JPO&INPIT
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