Pump Device

摘要

In a hollow seal member kept in abutted-engagement with a shaft hole formed in a housing via an elastic body and kept in sliding-contact with an outer circumference of a drive shaft for sealing against a leakage of fluid from a pump chamber, the seal member is provided with a seal part formed within an area at one end and kept in sliding-contact with the outer circumference of the drive shaft over a given hollow inner circumferential surface, and a rotation-stopping part formed within an area at the other end for restricting a movement of the seal member in a rotation direction of the drive shaft. A rotational resistance of the rotation-stopping part to the drive shaft is set to be less than a rotational resistance of the seal part.

主权项

1. A pump device comprising:
a housing; a drive shaft fitted into a shaft hole formed in the housing and driven by a driving power source; a pump installed in a pump chamber, formed in the housing and configured to be continuous with the shaft hole, and driven by the drive shaft; and a hollow seal member kept in abutted-engagement with the shaft hole via an elastic body and kept in sliding-contact with an outer circumference of the drive shaft for sealing against a leakage of fluid from the pump chamber, wherein: the seal member is provided with a seal part formed within an area at one end and kept in sliding-contact with the outer circumference of the drive shaft over a given hollow inner circumferential surface, and a rotation-stopping part formed within an area at the other end for restricting a movement of the seal member in a rotation direction of the drive shaft, and a rotational resistance of the rotation-stopping part to the drive shaft is set to be less than a rotational resistance of the seal part.