| 摘要 |
A rotor housing (2) has flanges (8) projecting to two sides in the directions of axes of rotors and having suction flow outlets for suction pipes (33) which are integrally connected to the rotor housing (2). The rotor housing (2), a collector housing (21), and the suction pipes (33) are integrally formed of aluminum alloy casting. The lower surfaces of the flanges (8) of the rotor housing (2) are used as attaching surfaces to be attached to the upper surface of a cylinder head.
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