Assembling unit, pump and fuel-vapor-leakage check system

摘要

A first tubular portion has a cross sectional shape which is a non-perfect circle relative to an axis thereof. A second tubular portion is disposed concentrically with the first tubular portion. The second tubular portion has a cross sectional shape relative to its axis, which is a congruent shape of the cross sectional shape of the first tubular portion. A sealing member is disposed between the first tubular portion and the second tubular portion for sealing therebetween. The sealing member has a cross sectional shape of which length parallel to its axis is greater than length which is perpendicular to the axis.

主权项

1. A pump comprising:
a first tubular portion of which cross sectional shape is a non-perfect circle relative to an axis thereof; a second tubular portion disposed concentrically with the first tubular portion, the second tubular portion having a cross sectional shape relative to its axis, which is a congruent shape of the cross sectional shape of the first tubular portion; and an annular sealing member disposed between the first tubular portion and the second tubular portion for sealing therebetween; and a pump body including a suction portion for suctioning a fluid and a discharge portion for discharging a pressurized fluid, wherein: the sealing member has a cross sectional shape of which length parallel to its axis is greater than length which is perpendicular to the axis, the first tubular portion is formed integrally with the suction portion or the discharge portion, the pump body has a cylindrical cam ring, a pair of plate portions closing each opening end of the cam ring, and a pump chamber defined by an interior of the cam ring and the plate portions in such a manner as to communicate with the suction portion, and the discharge portion, and the first tubular portion is formed on an outer peripheral surface of the cam ring.