Hollow gerotor
AssigneeParker-Hannifin Corporation
InventorRichard T. Friedman
Life of this patent
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Abstract
Provided is a hollow rotor and method for making a hollow rotor for a gerotor system, the gerotor system including inner and outer rotors having interengaging lobed profiles. At least one of the inner or outer rotors comprises the hollow rotor, the hollow rotor including radially inner and outer walls radially spaced-apart in relation to a rotational axis of the rotor and walls extending between the radially inner and outer walls for closing axial ends of the hollow rotor. The radially inner and outer walls define therebetween a cavity, thus providing for a hollow or empty interior of the hollow rotor. At least one of the radially inner or outer walls forms a plurality of lobes circumferentially spaced-apart around the cavity.
Claims31
A hollow rotor for a gerotor system, the hollow rotor comprising:
- radially inner and outer walls radially spaced-apart in relation to a rotational axis of the rotor, the radially inner and outer walls defining therebetween a continuous annular cavity, at least one of the radially inner and outer walls forming a plurality of lobes circumferentially spaced-apart around the cavity;
- wherein axial ends of the cavity are closed by respective walls extending between the radially inner and outer walls, so that the cavity is enclosed on all sides to form a sealed enclosure.
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A gerotor system comprising:
- an inner rotor and an outer rotor having respective lobed profiles for interengaging with one another,
- wherein the inner rotor is a hollow rotor and includes
- front and rear axial faceplate portions;
- radially spaced-apart first and second ring portions extending between the front and rear faceplate portions, the first ring portion radially disposed about the second ring portion, wherein the first ring portion has a substantially lobed profile;
- and
- a cavity defined by interconnection of the first and second ring portions and the front and rear faceplate portions, thereby defining a sealed enclosure.
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A method of making a hollow rotor having axial ends and radially inner and outer walls radially spaced-apart and extending therebetween, the method comprising:
- connecting an inner member having a radially outer surface and an outer member having a radially inner surface, which when the outer member is assembled to the inner member the radially inner and outer surfaces are radially spaced-apart to define therebetween a cavity, and wherein connecting the inner member and the outer member includes receiving the inner member at the outer member, the outer member having an open end having a profile corresponding to a profile of the inner member, thereby forming a seam between the connected profiles, the seam being disposed at the axial ends and spaced from the radially inner and outer walls;
- and
- removing material from the inner or outer member to form an inner or outer wall of the hollow rotor, the inner or outer wall of the hollow rotor forming a plurality of circumferentially spaced-apart lobes.
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Dependencies are inferred from the claim text.