A gear pump includes a pair of gears that meshes with each other, two rotational shafts inserted into the respective gears that rotate together with gears, a pair of side plates arranged adjacent to both side surfaces of the gears, each having two through-holes forming bearings of the two shafts, a seal block that abuts against the pair of side plates and covers a part of the pair of gears, a pump assembly having the gears, the two shafts, the pair of side plates, and the seal block, and a case having a recess to accommodate the pump assembly. A line passing through an arc center of a cylindrical surface inscribed in the facing surface of the case, and parallel to the two shafts, forms a rotating axis. When the pump assembly rotates about the rotating axis, one of the of side plates contacts the inner wall of the case.

A gear pump includes a pump housing, a two meshed with a driven gear, a suction housing, and a suction cavity. The suction housing includes a body portion having first and second sealing disposed adjacent to outer diameters of the gears. A suction chamber wall is disposed between the first and second sealing surfaces and a sealing land is adjacent to a planar running surface of the pump housing. A flange of the suction housing has a third sealing surface disposed in contact with gear faces of the gears. The suction cavity is open to the inlet and defined in part by the suction chamber wall.

A sealing gasket (20) for a vacuum pump, the sealing gasket (20) comprising: a first surface (30, 40); a second surface (32, 42) opposite to the first surface (30, 40); opposing side walls (34, 36; 44, 46) disposed between the first surface (30, 40) and the second surface (32, 42); and one or more protrusions (48a, 48b, 48c, 48d) extending from the first surface.