Patent ID: 8419396

Claim:
A vane pump comprising: an electric motor that includes a mount portion; a rotor that includes a plurality of vanes and is adapted to be rotated together with the plurality of vanes by a rotational drive force of the electric motor; an upper casing that rotatably receives the rotor and includes: a pump chamber that has an inner peripheral wall, along which the plurality of vanes slides to draw fluid into the pump chamber and to discharge the fluid pressurized in the pump chamber out of the pump chamber upon rotation of the rotor; a primary planar surface portion that is formed around an opening of the pump chamber; and a primary through hole that penetrates through the primary planar surface portion; a lower casing that includes: a secondary planar surface portion that is joined to the primary planar surface portion; and a secondary through hole that extends through the secondary planar surface portion at a location, which corresponds to the primary through hole, wherein the lower casing closes the opening of the pump chamber to form the pump chamber in cooperation with the upper casing; a resilient sheet that is placed between the lower casing and the mount portion and includes a tertiary through hole at a location, which corresponds to the secondary through hole; and a screw member that is received through the primary through hole, the secondary through hole and the tertiary through hole to securely connect the upper casing, the lower casing and the resilient sheet to the mount portion, wherein: at least one of two opposed surfaces of the resilient sheet, which are opposed to each other in a direction perpendicular to a plane of the resilient sheet, includes a plurality of primary protrusions; a secondary protrusion is formed in the at least one of the two opposed surfaces of the resilient sheet and is configured to circumferentially extend all around an entire peripheral edge of an opening of the tertiary through hole; and the secondary protrusion has a projecting height that is generally the same as a projecting height of each of the plurality of primary protrusions.