To provide a tandem trochoid pump capable of preventing a spacer eccentric to a drive shaft from sliding and rotating with accompanying rotation of each pump structure.
In the tandem trochoid pump, the drive shaft 3 transmitting drive force to each pump is inserted through a first pump structure 5, a second pump structure 6, and a spacer 7 separating each pump structure, and is stored in a rotor storage chamber 11 of a housing body 1. The spacer 7 is formed in a disk shape including a shaft insertion through hole 7b eccentric to the drive shaft and is provided with an engagement projection 25 having a trapezoid longitudinal section on a meshing line of each pump structure. An inner circumference wall 11a of the rotor storage chamber is provided with an engagement groove 29 having U-shape lateral section. Consequently, since the engagement projection of the spacer engages with the engagement groove, rotation of the spacer with accompanying drive rotation of each pump structure is prevented.
ONISHI HIDEAKI
WATANABE YASUSHI
| JP2004068683A | 2004-03-04 | |||
| JPH048887A | 1992-01-13 |
Hiromichi Kobayashi
Tomioka Kiyoshi