초록 ▼

The present invention provides an assembly for attaching a hub to a shaft. The hub, which may be a portion of a gear, pulley, chain sprocket or other power carrying device, includes a collar or annular wall having two axially extending relief cuts on opposite sides of a shaft opening, which define a

The present invention provides an assembly for attaching a hub to a shaft. The hub, which may be a portion of a gear, pulley, chain sprocket or other power carrying device, includes a collar or annular wall having two axially extending relief cuts on opposite sides of a shaft opening, which define a pair of opposed projections or clamp members. The clamp members include opposed flats on the inside of the shaft opening which engage complementarily configured flats on the shaft. A threaded fastener such as a bolt extends through smooth radial bores in one clamp member and the shaft and into a complementarily threaded bore in the other clamp member. The internal flats of the hub include opposed arcuate, axially extending reliefs. The outside surface of the hub proximate the smooth bore defines a chordal surface which the bolt engages.

대표청구항 ▼

What is claimed is: 1. A hub and shaft attachment assembly, comprising, in combination, a hub having a pair of axially extending slots defining an opposed pair of flanges, each of said opposed flanges having an internal chordal surface, one of said flanges having an exterior flat and a smooth radia

What is claimed is: 1. A hub and shaft attachment assembly, comprising, in combination, a hub having a pair of axially extending slots defining an opposed pair of flanges, each of said opposed flanges having an internal chordal surface, one of said flanges having an exterior flat and a smooth radial bore, another of said flanges having a threaded radial bore aligned with said smooth radial bore, a pair of opposing arcuate reliefs centered on the internal chordal surfaces, the pair of opposing arcuate reliefs disposed axially along the hub, a shaft having a pair of external chordal surfaces and a smooth radial bore, and a fastener extending through said bores and having a head disposed proximate said exterior flat, wherein the fastener further comprises a head portion disposed adjacent the external flat surface of a first of the opposed pair of clamp members, the head portion having a head mass, wherein the first of the opposing pair of clamp members has a first mass and a second of the opposing pair of clamp members has a second mass, and wherein the second mass is substantially the same as the combination of the first mass and the head mass. 2. The hub and shaft attachment assembly of claim 1 wherein said internal chordal surfaces of said flanges and said exterior flat of said one of said flanges are parallel. 3. The hub and shaft attachment assembly of claim 1 further including gear teeth disposed about a periphery of said hub. 4. A hub and shaft connection assembly comprising in combination, a hub including a pair of opposed, axially extending relief cuts defining a pair of projections, each of said projections having an internal chordal surface having a chordal width, one of said projections having an exterior chordal surface and a first bore, another of said projections having a second bore aligned with said first bore, a pair of opposing arcuate reliefs centered on the internal chordal surfaces, the pair of opposing arcuate reliefs each having a relief width, wherein the relief width is between approximately 1/7 and approximately ¼ of the chordal width, a shaft having a pair of external chordal surfaces and a third bore, and a fastener extending through said bores in said hub and said shaft, wherein the fastener further comprises a head portion disposed adjacent the external flat surface of a first of the opposed pair of clamp members, the head portion having a head moment of inertia, wherein the first of the opposing pair of clamp members has a first moment of inertia and a second of the opposing pair of clamp members has a second moment of inertia, and wherein the second moment of inertia is substantially the same as the combination of the first moment of inertia and the head moment of inertia. 5. The hub and shaft connection assembly of claim 4 wherein said projections are diametrically opposed. 6. The hub and shaft connection assembly of claim 4 wherein said axially extending arcuate reliefs are centered on said chordal surfaces. 7. The hub and shaft connection assembly of claim 4 wherein said radial bore is normal to said exterior chordal surface of said one of said projections. 8. The hub and shaft connection assembly of claim 4 wherein said bores in said shaft and said one of said projections is smooth walled. 9. The hub and shaft connection assembly of claim 4 wherein said bore in said another of said projections is threaded. 10. The hub and shaft connection assembly of claim 4 wherein said fastener includes a head disposed proximate said exterior chordal surface of said hub. 11. A hub and shaft securement assembly comprising, in combination, a hub having a pair of opposed, axially extending slots defining an opposed pair of clamp members, each of said clamp members having an internal flat surface, one of said clamp members having an external flat surface parallel to said internal flat surface and a first bore, another of said clamp members having a second bore, a pair of opposing arcuate reliefs centered on the internal flat surfaces, the pair of opposing arcuate reliefs disposed axially along the hub, a shaft member having a pair of external flat surfaces and a third bore, and a fastener extending through said bores in said clamp members and said shaft, wherein the fastener further comprises a head portion disposed adjacent the external flat surface of a first of the opposed pair of clamp members, the head portion having a head moment of inertia, wherein the first of the opposing pair of clamp members has a first moment of inertia and a second of the opposing pair of clamp members has a second moment of inertia, and wherein the second moment of inertia is substantially the same as the combination of the first moment of inertia and the head moment of inertia. 12. The hub and shaft securement assembly of claim 11 wherein said internal flat surfaces are parallel. 13. The hub and shaft securement assembly of claim 11 wherein said bores are radially oriented. 14. The hub and shaft securement assembly of claim 11 wherein said bore in said another of said clamp members is threaded. 15. The hub and shaft securement assembly of claim 11 wherein said pair of axially extending slots define semi-circular ends. 16. The hub and shaft securement assembly of claim 11 wherein said hub includes gear teeth. 17. The hub and shaft securement assembly of claim 11 wherein said hub is a pulley and includes at least one belt groove. 18. The hub and shaft securement assembly of claim 11, wherein the opposed pair of clamp members further comprise semi-cylindrical internal surface portions and the shaft member further comprises semi-cylindrical external surface portions, wherein the semi-cylindrical internal surface portions mate with the semi-cylindrical external surface portions when the fastener is tightened. 19. The hub and shaft securement assembly of claim 11, wherein the internal flat surfaces have a flat width and the pair of opposing arcuate reliefs have a relief width that is between approximately 1/7 and approximately ¼ of the flat width.