Patent ID: 6695604
Filing Date: 2004-02-24
Classification: F04C

Abstract:
A gear assembly having a lifting feature for a fuel pump for supplying fuel to an automotive engine from a fuel tank, the assembly comprising:an inner gear having a substantially disc shape with an outside camming surface and having an inner cover face and an inner body face, the inner gear having a center aperture formed therethrough defining an axis of rotation perpendicular to the inner cover and inner body faces, the inner cover face having a plurality of inner concave grooves radially formed thereon and spaced apart from each other to provide lifting of the inner gear when rotating about the axis, the inner gear including a plurality of exit holes formed therethrough and spaced apart between each of the inner concave grooves, each of the exit holes being formed through the inner gear extending about 30Â°; and an outer gear having a substantially planar shape, the outer gear including an annular wall having an inside camming surface slideably engaging about the outside camming surface to matingly cooperate with the inner gear for rotation about the axis, the outer gear having an outer cover surface and an outer body surface, the outer cover surface having a plurality of outer concave grooves radially formed thereon and spaced apart from each other to provide lifting of the outer gear when rotating about the axis.