Patent US4020373A successfully refreshed from Google Patents.
US4020373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary electric machine
Assignee: Hitachi Ltd
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Filing: 1975-10-01
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Granted: 1977-04-26
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Expires: 1995-10-01
Abstract
Abstract An end of an end cover provided on a fixed electromagnetic device is arranged in spaced opposition to the side wall of spider arms which are perpendicular to a rotary axis, the spider arms being projected radially from the rotary shaft. The end of the end cover is positioned midway of the spider arms on the radii thereof, thus substantially eliminating the fan loss of the rotary electric machine.
Inventors
- 👤 Hiroe Yamamoto
- 👤 Noriyoshi Takahashi
- 👤 Masatoshi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:26
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/10; H02K9/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
193 words
A rotary electric machine comprising a rotary shaft, a plurality of spider arms projecting radially from said rotary shaft, an electromagnetic rotor device arranged on the outer periphery of said spider arms, an electromagnetic stator device disposed opposite to said electromagnetic rotor device with a predetermined space therebetween, an end cover for covering axial sides of said electromagnetic stator device, said end cover having an inner end thereof arranged midway on the radius of said spider arms in slightly spaced relationship with the side wall of said arms so as to provide a small space therebetween and, a spider cover on the side of said spider arms axially thereof, said spider cover having at least one inner and outer air inlet hole, each air inlet hole being smaller than the space between adjacent ones of said spider arms, said inner air inlet hole being situated at a position on said spider cover a smaller distance from said rotary shaft then said outer air inlet hole, said end cover having an end thereof positioned between said outer air inlet hole and said inner air inlet hole in slightly spaced relation with said spider cover.
Claim 2
Dependent Claim
193 words
A rotary electric machine comprising a rotary shaft, a plurality of spider arms projecting radially from said rotary shaft, an electromagnetic rotor device arranged on the outer periphery of said spider arms, an electromagnetic stator device disposed opposite to said electromagnetic rotor device with a predetermined space therebetween, an end cover for covering axial sides of said electromagnetic stator device, said end cover having an inner end thereof arranged midway on the radius of said spider arms in slightly spaced relationship with the side wall of said arms so as to provide a small space therebetween and, a spider cover on the side of said spider arms axially thereof, said spider cover having at least one inner and outer air inlet hole, each air inlet hole being smaller than the space between adjacent ones of said spider arms, said inner air inlet hole being situated at a position on said spider cover a smaller distance from said rotary shaft then said outer air inlet hole, said end cover having an end thereof positioned between said outer air inlet hole and said inner air inlet hole in slightly spaced relation with said spider cover.
Claim 3
Dependent Claim
29 words
A rotary electric machine according to claim 1, in which said small space between said end cover and said spider cover forms a maze radially of said rotary shaft.
Claim 4
Dependent Claim
54 words
A rotary electric machine according to claim 1, in which that end of said spider cover which is in opposition to said end cover is provided with an annular embankment protruding toward said end cover, and a small space is formed between an end of said embankment and an end of said end cover.
References Cited (Backward Citations)
US3160770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |