US3624436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-cooled electromagnetic brake
Assignee: Eaton Corp
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Filing: 1970-11-13
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Granted: 1971-11-30
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Expires: 1990-11-13
Abstract
Abstract An air-cooled eddy-current brake utilized to retard and control the velocity of a driven or output shaft. The output shaft is driven by a variable speed coupling whose input or driving member is rotated at a constant velocity by a prime mover such as an AC electric motor. The eddy-current brake is in fluid communication with a fan device driven at a constant speed by the prime mover and thereby receives a substantially constant supply of cooling air regardless of the velocity of the output shaft.
Inventors
- 👤 Ralph L Jaeschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:01
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/02; H02K49/04; H02K49/043; F; F16; F16D; F16D55/00; F16D65/00; F16D65/78; F16D67/00; F16D67/02; F16D67/06; H02K7/00; H02K7/10; H02K7/114; F16D2121/00; F16D2121/18; F16D2121/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
198 words
In a power transmission device comprising a housing, a first rotatable shaft mounted within said housing, a second rotatable shaft mounted with said housing, an AC motor mounted within said housing, said AC motor driving said first shaft at a substantially constant speed, a coupling means for driving said second shaft at variable speeds comprising a driving member and a driven member, said driving member secured to said first shaft and rotated therewith, said driven member secured to said second shaft and rotated therewith, an electromagnetic brake comprising first and second members, said first member adapted to be secured to said housing, said second member secured to said second shaft and rotatable therewith, a field coil associated with said brake for generating a magnetic field when energized causing a torque to be developed for braking the second shaft, and means for cooling said brake comprising fins attached to the rotating member of said AC motor for supplying a substantially constant supply of air to the first and second brake members independent of the speed of the second shaft, said fins communicating with said brake through apertures on a section of said housing separating said motor and said brake.
Claim 2
Dependent Claim
198 words
In a power transmission device comprising a housing, a first rotatable shaft mounted within said housing, a second rotatable shaft mounted with said housing, an AC motor mounted within said housing, said AC motor driving said first shaft at a substantially constant speed, a coupling means for driving said second shaft at variable speeds comprising a driving member and a driven member, said driving member secured to said first shaft and rotated therewith, said driven member secured to said second shaft and rotated therewith, an electromagnetic brake comprising first and second members, said first member adapted to be secured to said housing, said second member secured to said second shaft and rotatable therewith, a field coil associated with said brake for generating a magnetic field when energized causing a torque to be developed for braking the second shaft, and means for cooling said brake comprising fins attached to the rotating member of said AC motor for supplying a substantially constant supply of air to the first and second brake members independent of the speed of the second shaft, said fins communicating with said brake through apertures on a section of said housing separating said motor and said brake.
Claim 3
Dependent Claim
24 words
The device of claim 1 wherein said housing has a wall portion separating said brake from said AC motor, said wall having apertures therethrough.
Claim 4
Dependent Claim
25 words
The device of claim 2 wherein said housing has air inlet apertures therein, said brake interposed said air inlet apertures and said wall portion apertures.
Claim 5
Dependent Claim
210 words
A power transmission device comprising: a housing with air inlets therein; a first rotatable shaft mounted within said housing, said first rotatable shaft driven at a substantially constant speed by an AC motor; a second rotatable shaft mounted within said housing; a coupling means for driving said second shaft at variable speeds comprising a driving member and a driven member, said driving member secured to said first shaft and rotated therewith, said driven member secured to said second shaft and rotated therewith; an electromagnetic brake comprising first and second members, said first member adapted to be secured to said housing, said second member secured to said second shaft and rotatable therewith, a field coil associated with said brake for generating a magnetic field when energized causing a torque to be developed for braking the second shaft; a wall portion of said housing separating said brake from said AC motor, said wall portion having apertures therethrough; and fins mounted to the rotating member of said AC motor, said brake interposed said air inlets and said wall portion apertures so that said fins will draw cooling air through said air inlets, over said brake and through said wall apertures at a substantially constant rate regardless of the speed of said second shaft.
Claim 6
Dependent Claim
210 words
A power transmission device comprising: a housing with air inlets therein; a first rotatable shaft mounted within said housing, said first rotatable shaft driven at a substantially constant speed by an AC motor; a second rotatable shaft mounted within said housing; a coupling means for driving said second shaft at variable speeds comprising a driving member and a driven member, said driving member secured to said first shaft and rotated therewith, said driven member secured to said second shaft and rotated therewith; an electromagnetic brake comprising first and second members, said first member adapted to be secured to said housing, said second member secured to said second shaft and rotatable therewith, a field coil associated with said brake for generating a magnetic field when energized causing a torque to be developed for braking the second shaft; a wall portion of said housing separating said brake from said AC motor, said wall portion having apertures therethrough; and fins mounted to the rotating member of said AC motor, said brake interposed said air inlets and said wall portion apertures so that said fins will draw cooling air through said air inlets, over said brake and through said wall apertures at a substantially constant rate regardless of the speed of said second shaft.
Claim 7
Dependent Claim
33 words
The device of claim 4 wherein said first and second shafts are coaxially aligned, at least one of said shafts being at least partially hollow and surrounding a portion of said other shaft.
References Cited (Backward Citations)
US2286777A
Cited
US3566168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |