Patent US4377762A successfully refreshed from Google Patents.
US4377762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary electric machine rotor and a method of manufacturing the same
Assignee: Hitachi Ltd
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Filing: 1981-01-07
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Granted: 1983-03-22
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Expires: 2001-01-07
Abstract
Abstract A rotary electric machine rotor comprises a rotary shaft which is formed with a plurality of protuberances projecting beyond a basic circle and extending in a lengthwise direction, and a core which is made of a plurality of core segments smaller in deformation resistance than that of the rotary shaft. The rotary shaft is plastically pressed into the core and has an annular groove formed at a position of the rotary shaft somewhat inward of an end face of the core. The core is plastically deformed and a part of the core is filled fully in the annular groove while axially pressing the core.
Inventors
- 👤 Hideo Tatsumi
- 👤 Hisanobu Kanamaru
- 👤 Akira Tohkairin
- 👤 Moisei Okabe
- 👤 Ryoji Kasama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:13
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/02; H02K15/021; H02K15/022; B; B21; B21K; B21K25/00; F; F16; F16D; F16D1/00; F16D1/06; F16D1/064; F16D1/072; H02K1/00; H02K1/06; H02K1/22; H02K1/28; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49826; Y10T29/49908; Y10T29/49925; Y10T29/49934; Y10T29/49945
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
196 words
A rotor of a rotary electric machine comprising: a rotary shaft having a circumferential surface with at least one annular groove therein and a plurality of axially extending protuberances thereon; and a rotor core having an aperture for receiving said rotary shaft therein; wherein the rotary shaft is press-fit within said aperture of the rotor core with said annular groove being positioned slightly inside of an end face of said rotary core, and wherein a portion of said end face near said shaft has been cold-pressed, while a preload has been exerted on the remaining portion of said end face, in a manner such that the rotor core and rotary shaft are fastened together by a portion of said rotor core having been plastically deformed into said annular groove in the rotary shaft filling same, and a recessed portion is formed in said end face which satisfies the following relationship relative to the annular groove: 0≦s/b≦3/4, wherein s denotes the distance from the bottom of the recessed portion in the end face to the groove, and b denotes the width from the circumference of said rotary shaft to the outer circumferential end of the recessed portion.
Claim 2
Dependent Claim
196 words
A rotor of a rotary electric machine comprising: a rotary shaft having a circumferential surface with at least one annular groove therein and a plurality of axially extending protuberances thereon; and a rotor core having an aperture for receiving said rotary shaft therein; wherein the rotary shaft is press-fit within said aperture of the rotor core with said annular groove being positioned slightly inside of an end face of said rotary core, and wherein a portion of said end face near said shaft has been cold-pressed, while a preload has been exerted on the remaining portion of said end face, in a manner such that the rotor core and rotary shaft are fastened together by a portion of said rotor core having been plastically deformed into said annular groove in the rotary shaft filling same, and a recessed portion is formed in said end face which satisfies the following relationship relative to the annular groove: 0≦s/b≦3/4, wherein s denotes the distance from the bottom of the recessed portion in the end face to the groove, and b denotes the width from the circumference of said rotary shaft to the outer circumferential end of the recessed portion.
Claim 3
Dependent Claim
23 words
A rotor according to claim 1, wherein said rotor core comprises a pair of rotor core members and a yoke tightly sandwiched therebetween.
Claim 4
Dependent Claim
22 words
A rotor according to claim 1, wherein the rotor core comprises a pair of hollow stoppers and a yoke tightly sandwiched therebetween.
Claim 5
Dependent Claim
15 words
A rotor according to claim 1, wherein said protuberances have a height of 0.065˜0.085/2 mm.
Claim 6
Dependent Claim
19 words
A rotor according to claim 4, wherein the depth of said annular groove is 0.2 mm to 1.0 mm.
Claim 7
Dependent Claim
24 words
A rotor according to claim 1, wherein said shaft is provided with a pair of said annular grooves and said protuberances are located therebetween.
Claim 8
Dependent Claim
14 words
A rotor according to claim 2, wherein said yoke tapers radially inwardly in thickness.
References Cited (Backward Citations)
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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) | 1986-03-21 | 1986-09-20 | 1987-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-21 | 1990-09-20 | 1991-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-21 | 1994-09-20 | 1995-03-22 | $7700.00 | Window Closed / Lapsed |