Patent US4603273A successfully refreshed from Google Patents.
US4603273A
Expired / Lapsed
US
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Dynamoelectric machine with extended cleat assembly
Assignee: AO Smith Corp
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Filing: 1985-08-14
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Granted: 1986-07-29
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Expires: 2005-08-14
Abstract
Abstract A dynamoelectric machine is provided with a laminated stator having a central opening for receiving a rotor and a plurality of longitudinal slots adjacent to its peripheral surface. Each of these longitudinal slots contains an extended cleat. The cleats extend beyond each end of the stator stack and are shaped to define a tab and shoulder on each end. A pair of end bells are positioned on opposite ends of the stator stack and each includes a central aperture in axial alignment with the central opening of the stator stack and a plurality of holes for receiving the extended cleat tabs. During assembly, an expandable arbor is positioned within the central opening and the end bell apertures to provide positive axial alignment between the end bells and the stator stack. Each end bell aperture has an initial diameter which is less than the diameter of the stator stack central opening. However expansion of the arbor resizes the end bell apertures so that their diameters become approximately equal to that of the central opening. The extended cleat tabs are then attached to the motor end bells, thereby securing the stator stack, cleats and end bells into a single unit.
Inventors
- 👤 George M. McDonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:37
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/15; H02K15/00; H02K15/16; H02K5/16; H02K5/167; H02K5/1672
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
226 words
A dynamoelectric machine comprising: a plurality of laminations positioned adjacent to each other to form a stator stack having a central opening for receiving a rotor; a plurality of longitudinally extending grooves positioned at spaced locations adjacent to the outer surface of said stator stack; a plurality of cleats; each of said cleat passing through one of said grooves and extending beyond said stator stack; each of said cleats including a tab at each end and a shoulder adjacent to each of said tabs; a pair of end bells positioned on opposite sides of said stator stack and defining a plurality of holes for receiving said tabs; means for securing said tabs to said end bells wherein each of said shoulders abuts an internal surface of one of said end bells; a first bearing module in a first aperture in a first one of said end bells; a second bearing module in a second aperture in a second one of said end bells; a rotor having a shaft which passes through said first and second bearing modules; wherein said first end bell includes a first plurality fo fingers encompassing said first aperture and in frictional contact with said first bearing module; and wherein said second end bell includes a second plurality of fingers encompassing said second aperture and in frictional contact with said second bearing module.
Claim 2
Dependent Claim
226 words
A dynamoelectric machine comprising: a plurality of laminations positioned adjacent to each other to form a stator stack having a central opening for receiving a rotor; a plurality of longitudinally extending grooves positioned at spaced locations adjacent to the outer surface of said stator stack; a plurality of cleats; each of said cleat passing through one of said grooves and extending beyond said stator stack; each of said cleats including a tab at each end and a shoulder adjacent to each of said tabs; a pair of end bells positioned on opposite sides of said stator stack and defining a plurality of holes for receiving said tabs; means for securing said tabs to said end bells wherein each of said shoulders abuts an internal surface of one of said end bells; a first bearing module in a first aperture in a first one of said end bells; a second bearing module in a second aperture in a second one of said end bells; a rotor having a shaft which passes through said first and second bearing modules; wherein said first end bell includes a first plurality fo fingers encompassing said first aperture and in frictional contact with said first bearing module; and wherein said second end bell includes a second plurality of fingers encompassing said second aperture and in frictional contact with said second bearing module.
Claim 3
Dependent Claim
23 words
A dynamoelectric machine as recited in claim 1, wherein said means for securing said tabs includes a bend in each of said tabs.
Claim 4
Dependent Claim
39 words
A dynamoelectric machine as recited in claim 1, wherein said means for securing said tabs includes a twist in a portion of each of said tabs which extends through one of said holes in one of said end bells.
Claim 5
Dependent Claim
29 words
A dynamoelectric machine as recited in claim 1, wherein said means for securing said tabs includes a weld between each of said tabs and one of said end bells.
Claim 6
Dependent Claim
35 words
A dynamoelectric machine as recited in claim 1, wherein each of said end bells includes a central aperture having substantially the same diameter as said central opening and being axially aligned with said central opening.
Claim 7
Dependent Claim
30 words
A dynamoelectric machine as recited in claim 1, wherein each of said end bells includes a longitudinally extending peripheral flange sized to form an interference fit with said stator stack.
Claim 8
Dependent Claim
41 words
A dynamoelectric machine as recited in claim 1, further comprising: a stator winding passing through said stator stack, said winding including end turns disposed on opposite sides of said stator stack; and wherein said cleats extend longitudinally beyond said end turns.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |