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US 6,293,372 B1Granted
Friction disc with integral anti-rattle portion for electric motor brake
AssigneeRexnord Inc.
InventorsDennis Lorenz, Steven F. Chmiel
Life of this patent
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AssigneeRexnord Inc.
InventorsDennis Lorenz, Steven F. Chmiel
Estimating the term…
In an electric motor brake, a friction disc includes an anti-rattle portion integrally molded therewith and reducing the tolerance gap between the motor shaft hub and the friction disc to minimize rattling of the friction disc during rotation of the shaft, and eliminating the need for a separate anti-rattle spring. In a first embodiment, the friction disc has a cavity at the inner circumference thereof facing the hub, and a cantilever finger extending into the cavity and engaging the hub and providing a cantilever bias urging engagement of the hub and friction disc. In a second embodiment, a bump on a slotted inner circumference of the friction disc provides the biasing portion, or may be spaced from the hub by a nominal clearance.
A brake mechanism adapted for selectively stopping and permitting rotation of an electric motor shaft, said shaft having a hub rotating therewith about the axis of said shaft, a friction disc mounted on said hub in keyed relation for rotation therewith and engageable with a pressure plate for stopping rotation of said friction disc, to stop rotation of said hub and shaft, wherein said friction disc has an inner circumference with at least one engagement surface engaging said hub, wherein said friction disc includes an anti-rattle portion integrally molded therewith and reducing the tolerance gap between said hub and said friction disc to minimize rattling of said friction disc during rotation of said shaft, wherein said anti-rattle portion reduces said tolerance gap to zero.
A brake mechanism adapted for selectively stopping and permitting rotation of an electric motor shaft, said shaft having a hub rotating therewith about the axis of said shaft, a friction disc mounted on said hub in keyed relation for rotation therewith and engageable with a pressure plate for stopping rotation of said friction disc, to stop rotation of said hub and shaft, wherein said friction disc has an inner circumference with at least one engagement surface engaging said hub, wherein said friction disc includes an anti-rattle portion integrally molded therewith and reducing the tolerance gap between said hub and said friction disc to minimize rattling of said friction disc during rotation of said shaft, wherein said friction disc has a cavity at said inner circumference facing said hub, and said anti-rattle portion comprises a biasing portion integrally molded with said friction disc and engaging said hub and applying a bias which urges engagement of said hub and said friction disc to minimize rattling of said friction disc during rotation of said shaft, wherein said biasing portion extends into said cavity and engages said hub and provides said bias.
A brake mechanism adapted for selectively stopping and permitting rotation of an electric motor shaft, said shaft having a hub rotating therewith about the axis of said shaft, a friction disc mounted on said hub in keyed relation for rotation therewith and engageable with a pressure plate for stopping rotation of said friction disc, to stop rotation of said hub and shaft, wherein said friction disc has an inner circumference with at least one engagement surface engaging said hub, wherein said friction disc includes an anti-rattle portion integrally molded therewith and reducing the tolerance gap between said hub and said friction disc to minimize rattling of said friction disc during rotation of said shaft, wherein said anti-rattle portion comprises a biasing portion integrally molded with said friction disc and applying a bias which urges engagement of said hub and said friction disc to minimize rattling of said friction disc during rotation of said shaft, and wherein said biasing portion comprises a compression bump integrally formed on said inner circumference of said friction disc.
A brake mechanism adapted for selectively stopping and permitting rotation of an electric motor shaft, said shaft having a hub rotating therewith about the axis of said shaft, a friction disc mounted on said hub in keyed relation for rotation therewith and engageable with a pressure plate for stopping rotation of said friction disc, to stop rotation of said hub and shaft, wherein said friction disc has an inner circumference with at least one engagement surface engaging said hub, wherein said friction disc includes an anti-rattle portion integrally molded therewith and reducing the tolerance gap between said hub and said friction disc to minimize rattling of said friction disc during rotation of said shaft, wherein said anti-rattle portion comprises an anti-rattle bump integrally formed on said inner circumference of said friction disc, wherein the tolerance gap between said anti-rattle bump and said hub is zero.
A brake mechanism adapted for selectively stopping and permitting rotation of an electric motor shaft, said shaft having a hub rotating therewith about the axis of said shaft, said hub having an outer circumference with a first surface, a friction disc mounted on said hub in keyed relation for rotation therewith and engageable with a pressure plate for stopping rotation of said friction disc, to stop rotation of said hub and shaft, said friction disc having an inner circumference with a second surface, said second surface having an anti-rattle portion integrally formed therewith and reducing the tolerance gap between said first and second surfaces to minimize rattling of said friction disc during rotation of said shaft and eliminating the need for a separate anti-rattle spring, wherein said anti-rattle portion reduces said tolerance gap to zero.
A brake mechanism adapted for selectively stopping and permitting rotation of an electric motor shaft, said shaft having a hub rotating therewith about the axis of said shaft, said hub having an outer circumference with a first surface, a friction disc mounted on said hub in keyed relation for rotation therewith and engageable with a pressure plate for stopping rotation of said friction disc, to stop rotation of said hub and shaft, said friction disc having an inner circumference with a second surface, said second surface having an anti-rattle portion integrally formed therewith and reducing the tolerance gap between said first and second surfaces to minimize rattling of said friction disc during rotation of said shaft and eliminating the need for a separate anti-rattle spring, wherein said first and second surfaces face each other across a clearance gap, and wherein said anti-rattle portion comprises a bump integrally formed on said second surface and extending into said gap toward said first surface, and said bump engages said first surface.
A brake mechanism adapted for selectively stopping and permitting rotation of an electric motor shaft, said shaft having a hub rotating therewith about the axis of said shaft, said hub having an outer circumference with a first surface, a friction disc mounted on said hub in keyed relation for rotation therewith and engageable with a pressure plate for stopping rotation of said friction disc, to stop rotation of said hub and shaft, said friction disc having an inner circumference with a second surface, said second surface having an anti-rattle portion integrally formed therewith and reducing the tolerance gap between said first and second surfaces to minimize rattling of said friction disc during rotation of said shaft and eliminating the need for a separate anti-rattle spring, wherein said hub has a pair of oppositely facing flat surfaces comprising said first surface and a third surface, said inner circumference of said friction disc has a slotted configuration having a pair of oppositely facing flat surfaces comprising said second surface and a fourth surface, wherein said flat surfaces of said hub extend through said slotted configuration of said inner circumference of said friction disc in mating keyed relation such that said fourth surface engages said third surface, and wherein said anti-rattle portion comprises a bump integrally formed on said second surface and extending toward said first surface.
A brake mechanism adapted for selectively stopping and permitting rotation of an electric motor shaft, said shaft having a hub rotating therewith about the axis of said shaft, a friction disc mounted on said hub in keyed relation for rotation therewith and engageable with a pressure plate for stopping rotation of said friction disc, to stop rotation of said hub and shaft, wherein said friction disc has an inner circumference with at least one engagement surface engaging said hub, wherein said friction disc includes an anti-rattle portion integrally molded therewith and reducing the tolerance gap between said hub and said friction disc to minimize rattling of said friction disc during rotation of said shaft, wherein said friction disc has a cavity at said inner circumference facing said hub, and said anti-rattle portion comprises a cantilever finger extending into said cavity and engaging said hub and providing a cantilever bias along a biasing direction transverse to said axis of rotation of said shaft and which urges engagement of said hub and said friction disc to minimize rattling of said friction disc during rotation of said shaft.
Dependencies are inferred from the claim text.