Patent ID: 6599111
Filing Date: 2003-07-29
Classification: F01C,F04C

Abstract:
A vane pump, comprising:a pump housing including an inlet, an outlet, and therein a hollow space; a cam ring received in the hollow space and defining an inner space, said cam ring having an inner surface and side surfaces; a rotor placed in the inner space defined by the cam ring and defining a rotation axis, the rotor comprising plural vanes arranged in corresponding slots formed in the rotor, said vanes being adapted to have a slidable contact with the cam ring inner surface and movement in a radial direction of the rotor; a first wall member received in the hollow space and having side surfaces, one side surface of the first wall member facing one side surface of the cam ring, the first wall member comprising an intake passage provided with a groove that is formed on an outer cylindrical surface of the first wall member so that a partition wall portion is defined between the groove and an interface between a side surface of the first wall member and a side surface of the cam ring; a pair of intake ports formed on the one side surface of the first wall member, each intake port being connected with the inlet by the intake passage; and a pair of outlet ports formed on the one side surface of the first wall member.