A bearing structure for abutting a pair of gears of a gear pump includes a body (101) including a face (103) on which the gears (210) rotate, an inlet (109) defined in the body, and an outlet (107) defined in the body. The bearing structure includes a sealing portion (109) of the face configured to fluidly seal the inlet from the outlet, the sealing portion being defined as a portion of the face in sealing engagement with the gears at a rotational position of the gears wherein a volume contained by teeth (211) of the gears and the face is constant or about constant as the gears rotate.
