US 4,392,795 AGranted

Wear resistant rotor slots for vane-type pumps or motors

AssigneeRexnord Inc.

InventorLarry C. Smith

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Abstract

A rotor, for a vane-type fluid pump or motor, having upper and lower vane contact edges formed in each slot thereof is disclosed. The upper and lower vane contact edges substantially eliminate wear of the slots by the vanes reciprocating therein, thereby enabling pumps or motors employing the rotor to operate with low viscosity liquids for commercially useful periods of time.

Claims15

Dependent claims

In a rotor for a vane-type fluid pump or motor, said rotor comprising a toroid having a plurality of planar slots transverse to the circumference thereof;

each said slot extending across the entire width of said rotor and through said circumference to form a pair of upper edges at the intersection of said slot and said circumference, said slot being for the receipt of a vane complementary to said slot, said vane having side surfaces and a lower edge and a total depth V in said transverse direction, and being disposed for reciprocation in a direction slightly oblique to said transverse direction in said slot between a retracted position and an extended position, said vane in operation having a range of travel T between the maximum positions of retraction and extension in said transverse direction, and a maximum extension of X beyond said rotor circumference, and having a side in sliding contact with one of said upper edges;
the improvement to said rotor which comprises:
a side wall configuration in said slots including an upper portion having a width slightly greater than the width of said vane and opening into said circumference, and also including an undercut portion having a width greater than the width of said slot upper portion;
a lower edge formed within each said slot on a side wall thereof at the junction of said undercut portion and said upper portion of said slot;
said upper portion of said slot having a depth N in said transverse direction, and said undercut portion having a depth W in said transverse direction;
wherein W is greater than T, and V is greater than X plus N;
the width of said undercut portion relative to the width of said upper portion being such that sliding contact between each said slot and its respective obliquely reciprocating vane occurs substantially only on a said one upper edge and said lower edge of said slot and the side surfaces of said vane, while contact between said lower edge of said vane and the sides of said slot is substantially prevented.

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Dependencies are inferred from the claim text.

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Abstract

In a rotor for a vane-type fluid pump or motor, said rotor comprising a toroid having a plurality of planar slots transverse to the circumference thereof;

each said slot extending across the entire width of said rotor and through said circumference to form a pair of upper edges at the intersection of said slot and said circumference, said slot being for the receipt of a vane complementary to said slot, said vane having side surfaces and a lower edge and a total depth V in said transverse direction, and being disposed for reciprocation in a direction slightly oblique to said transverse direction in said slot between a retracted position and an extended position, said vane in operation having a range of travel T between the maximum positions of retraction and extension in said transverse direction, and a maximum extension of X beyond said rotor circumference, and having a side in sliding contact with one of said upper edges;
the improvement to said rotor which comprises:
a side wall configuration in said slots including an upper portion having a width slightly greater than the width of said vane and opening into said circumference, and also including an undercut portion having a width greater than the width of said slot upper portion;
a lower edge formed within each said slot on a side wall thereof at the junction of said undercut portion and said upper portion of said slot;
said upper portion of said slot having a depth N in said transverse direction, and said undercut portion having a depth W in said transverse direction;
wherein W is greater than T, and V is greater than X plus N;
the width of said undercut portion relative to the width of said upper portion being such that sliding contact between each said slot and its respective obliquely reciprocating vane occurs substantially only on a said one upper edge and said lower edge of said slot and the side surfaces of said vane, while contact between said lower edge of said vane and the sides of said slot is substantially prevented.

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