US4115030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor or generator including centrifugal cooling fan
Assignee: Soken Inc
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Filing: 1977-02-17
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Granted: 1978-09-19
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Expires: 1997-02-17
Abstract
Abstract A rotary electric machine comprising a housing containing therein several parts which are to be heated during operation of the machine, and a centrifugal cooling fan for producing an air circulation through the housing so as to cool the heated parts. The cooling fan is made of a disc-shaped metal plate having on its periphery a plurality of fan blades each formed by bending a radially outer portion of the metal plate upstandingly with respect to the surface thereof, and a plurality of notches each defined between the adjacent fan blades. A backing disc-plate is disposed at the back side of the cooling fan in a manner to block therewith the notches, thereby preventing an air from passing through the notches in an opposite direction from an ordinary air flow passing through the housing. The disc-plate and the cooling fan are disposed to define a small clearance therebetween for preventing rattling noises from being produced during rotation of the cooling fan due to an occasional vibratory contact therebetween.
Inventors
- 👤 Mitsuo Inagaki
- 👤 Hideaki Sasaya
- 👤 Takashi Kurahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:25
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/281; Y; Y10; Y10S; Y10S416/00; Y10S416/03
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
A rotary electric machine comprising: a housing having end wall means formed therein with a plurality of air vents for providing communication between an interior and an exterior of said housing; a rotary shaft rotatably supported by said housing; a cooling fan securely fitted on said rotary shaft for rotation therewith; said cooling fan having on its periphery means providing a plurality of fan blades, notches between said fan blades, and a backing disc-plate having a portion covering said notches and fixed at the back side of said cooling fan for rotation therewith, with a clearance defined between said disc-plate and said cooling fan for preventing vibratory contact between said disc-plate and said cooling fan, said clearance being selected within the range in which turbulence air flows are not produced.
Claim 2
Dependent Claim
130 words
A rotary electric machine comprising: a housing having end wall means formed therein with a plurality of air vents for providing communication between an interior and an exterior of said housing; a rotary shaft rotatably supported by said housing; a cooling fan securely fitted on said rotary shaft for rotation therewith; said cooling fan having on its periphery means providing a plurality of fan blades, notches between said fan blades, and a backing disc-plate having a portion covering said notches and fixed at the back side of said cooling fan for rotation therewith, with a clearance defined between said disc-plate and said cooling fan for preventing vibratory contact between said disc-plate and said cooling fan, said clearance being selected within the range in which turbulence air flows are not produced.
Claim 3
Dependent Claim
26 words
A rotary electric machine as defined in claim 1, further comprising a spacer securely fitted on said rotary shaft between said disc-plate and said cooling fan.
Claim 4
Dependent Claim
23 words
A rotary electric machine as defined in claim 1, wherein said clearance defining means is within the range from 1 to 3 millimeters.
Claim 5
Dependent Claim
26 words
A rotary electric machine as defined in claim 1, wherein said disc-plate has an outer diameter substantially larger than an outer diameter of said cooling fan.
Claim 6
Dependent Claim
38 words
A rotary electric machine as defined in claim 1, wherein said disc-plate includes a flat central portion offset toward and contacting the back surface of said cooling fan, said offset central portion of said disc-plate providing said clearance.
Claim 7
Dependent Claim
118 words
A rotary electric machine as defined in claim 1, wherein said cooling fan has a radially outward flat portion, a flat central portion offset from said outward flat portion toward said housing and a transient portion curved concavely from an axial direction to a radial direction when viewed in a direction of an air flow passing through said housing, each of said fan blades has a width gradually radially reduced from an inner edge to an outer edge thereof in a manner to provide a tapered side edge opposed to said housing, and said housing has a surface opposite to said fan blades which is tapered substantially parallel to said side edge of each of said fan blades.
Claim 8
Dependent Claim
92 words
A rotary electric machine as defined in claim 6, wherein said disc-plate includes a radially outward flat portion, a flat central portion offset toward said cooling fan and a transient curved concavely from an axial direction to a radial direction when viewed in the direction of the air flow passing through said housing, said central and transient portions of said disc-plate closely contacting said central and transient portions, respectively, of said cooling fan in a manner to define the clearance at a radially outer portion between said disc-plate and said cooling fan.
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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) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |