US4035676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Small electric motors
Assignee: ORIGINAL EQUIPMENT MOTORS Inc
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Filing: 1975-06-18
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Granted: 1977-07-12
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Expires: 1995-06-18
Abstract
Abstract Concentricity between the rotor and rotor shaft of a small motor is attained by a plastic, toothed hub on the shaft press fitted into the rotor; any eccentricity is removed by shearing the teeth.
Inventors
- 👤 Gerald L. Adair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:25
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/2726; H02K1/2733; H02K15/00; H02K15/02; H02K15/03
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
142 words
A rotor assembly for a subfractional dynamoelectric machine, comprising: a rotor shaft; a rotor hub, affixed to the rotor shaft, the hub having a periphery formed of deformable and shearable non-metallic plastic material and affording a plurality of spaced teeth projecting radially outwardly thereof to a substantially uniform diameter from the axis of the shaft; and a cylindrical permanent magnet rotor, magnetized to afford a plurality of magnetic poles angularly displaced around the cylinder periphery, the rotor cylinder being formed of a permanent magnet material substantially harder than said material of the hub teeth and having an inner diameter smaller than the diameter of the hub teeth, the inside diameter of the rotor cylinder being frictionally press fitted over the hub teeth which are thereby bent proportional to rotor eccentricity with the periphery of the cylinder co-axial relative to the rotor shaft.
Claim 2
Dependent Claim
142 words
A rotor assembly for a subfractional dynamoelectric machine, comprising: a rotor shaft; a rotor hub, affixed to the rotor shaft, the hub having a periphery formed of deformable and shearable non-metallic plastic material and affording a plurality of spaced teeth projecting radially outwardly thereof to a substantially uniform diameter from the axis of the shaft; and a cylindrical permanent magnet rotor, magnetized to afford a plurality of magnetic poles angularly displaced around the cylinder periphery, the rotor cylinder being formed of a permanent magnet material substantially harder than said material of the hub teeth and having an inner diameter smaller than the diameter of the hub teeth, the inside diameter of the rotor cylinder being frictionally press fitted over the hub teeth which are thereby bent proportional to rotor eccentricity with the periphery of the cylinder co-axial relative to the rotor shaft.
Claim 3
Dependent Claim
53 words
A motor assembly according to claim 1, in which the hub covers one end of the shaft, the other end of the shaft projecting outwardly of the rotor cylinder, and in which the hub has an integral, medially located axial projection, serving as a thrust element for said one end of the shaft.
References Cited (Backward Citations)
US3212170A
Cited
US3268751A
Cited
US3308319A
Cited
US3508091A
Cited
US3636392A
Cited
US3633055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |