Patent US4209722A successfully refreshed from Google Patents.
US4209722A
Expired / Lapsed
US
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Die cast rotor with cast-in-place oil return member
Assignee: Emerson Electric Co
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Filing: 1978-09-21
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Granted: 1980-06-24
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Expires: 1998-09-21
Abstract
Abstract A die cast rotor for an electric motor in which a tubular oil return member is sealingly cast-in-place within the body of the rotor.
Inventors
- 👤 C. Theodore Peachee, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:40
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/08; H02K7/085
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A die cast rotor for an electric motor or the like, said rotor having a rotor body of die cast metal, said body having a longitudinal central axis about which said rotor is rotatable, and a longitudinal central opening substantially coaxial with said central axis, a non-integral tubular oil return member defining the inner surface of a portion of said central opening, said tubular oil return member having an inner end, said die cast rotor body surrounds said inner end of said oil return member and engages both the inside and outside surfaces thereof so as to sealably secure said tubular oil return member to said rotor body and to prevent the leakage of oil between said inner end of said oil return member and said rotor body.
Claim 2
Dependent Claim
128 words
A die cast rotor for an electric motor or the like, said rotor having a rotor body of die cast metal, said body having a longitudinal central axis about which said rotor is rotatable, and a longitudinal central opening substantially coaxial with said central axis, a non-integral tubular oil return member defining the inner surface of a portion of said central opening, said tubular oil return member having an inner end, said die cast rotor body surrounds said inner end of said oil return member and engages both the inside and outside surfaces thereof so as to sealably secure said tubular oil return member to said rotor body and to prevent the leakage of oil between said inner end of said oil return member and said rotor body.
Claim 3
Dependent Claim
23 words
A rotor as set forth in claim 1 wherein said inner end of said oil return member tapers inwardly toward said central axis.
Claim 4
Dependent Claim
49 words
A rotor as set forth in claim 1 wherein said tubular oil return member has an outer surface which at least in part is directly engageable with said die cast rotor body so as to constitute a mold surface for said rotor body during die casting of said rotor.
Claim 5
Dependent Claim
60 words
A rotor as set forth in claim 1 further comprising a stack of lamination plates, said stack having a central opening coaxial with respect to the above-said central opening of said rotor, said oil return member being fitted in said central opening of said stack to hold said oil return member in position for being cast-in-place within said rotor body.
Claim 6
Dependent Claim
27 words
A rotor as set forth in claim 1 wherein said tubular oil return member has an end which extends out beyond one end of said rotor body.
References Cited (Backward Citations)
US2524555A
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US3121179A
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US3486050A
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US3420335A
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US4045698A
Cited
DE2502778A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |