PURPOSE:To make high accuracy working for the purpose of preventing increase of the number of parts as well as reducing the deviation of axial center, unnecessary by a method wherein the radial direction reference part in the same cylinder at the inside of a housing is utilized as the radial direction reference of a holder bearing and a casing pump, which are supporting both of bearings respectively. CONSTITUTION:The radial direction reference parts 110, 111 of the same cylinder at the inside of the housing 10 are utilized as the radial direction reference of the holder bearing 67, supporting the bearing 82, and the casing pump 21, supporting the bearing 28 respectively. The end parts of the inside of the housing are formed with steps 112, 113 and the outer peripheries of said holder bearing 67 and the casing pump 21 are formed with steps to engage with the steps 112, 113 of the housing 10. According to such constitution, the high accuracy working, for the purpose of preventing the increase of the number of parts as well as contriving the reduction of deviations of the axial centers of bearings 82, 28, may be made unnecessary.
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