| 摘要 |
PROBLEM TO BE SOLVED: To provide a tandem trochoid pump capable of positively preventing erroneous assembling by an assembling worker while using a pair of inner rotors which are substantially the same in shape. SOLUTION: This tandem trochoid pump is mainly configured of a first pump element 5 coupled to one end side of a drive shaft 3, and a second pump element 6 coupled to the other end side of the drive shaft 3 and partitioned by a partitioning member 7 from the first pump element 5. The first and second pump elements 5, 6 are coupled to the drive shaft 3 via first and second inner rotors 14, 17 having the same outer shapes. The first inner rotor 14 is fitted and fixed by straddling a step part 23 formed in the axial direction between a recessed noncircular part 2 formed at one end side of the drive shaft 3 and a circular part 22 formed further toward the other end side than the noncircular part 21. Thereby, the assembly of the first inner rotor 14 is allowed only from one side surface side with respect to the drive shaft 3, so that erroneous assembly of the first inner rotor 14 is positively prevented. COPYRIGHT: (C)2008,JPO&INPIT
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