To provide a pump device capable of preventing leakage of working fluid into outside at the time of assembling in a shipping destination, and preventing various failure accompanied by the leakage.
In this pump device, a reduction chamber 3 for reducing pulsation of working fluid pressurized by a pump part 1 is provided in the middle of a discharge passage 90 opened on the outer face of a housing 29 of the pump part 1. The pump device is provided with a residual fluid inflow prevention cylinder 5 of which one end part 50 is fitted and fixed to the discharge passage 90 between the outer face and the reduction chamber 3 and the other end part 54 is positioned inside the reduction chamber 3. A seal lip for liquid-tightly sealing a space between an inner wall of the discharge passage 90 and the one end part 50 is circumferentially provided outside the one end part 50. The seal lip is formed to have a small tapered shape in the discharge side. Instead of the seal lip, a seal part is provided. The outer diameter of the other end part 54 of the residual fluid inflow prevention cylinder 5 is made larger than the inner diameter of the discharge passage 90.
HAMAZAKI YOSHIAKI
TANIWA TAKASHI
ASANO KATSUTAKE
KOYO SEIKO CO
TOYODA MACHINE WORKS LTD
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