Patent US3861028A successfully refreshed from Google Patents.
US3861028A
Expired / Lapsed
US
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Method of producing a magneto rotor
Assignee: Robert Bosch GmbH
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Filing: 1973-10-19
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Granted: 1975-01-21
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Expires: 1993-10-19
Abstract
Abstract A plastoferrite pole ring is affixed to the inner circumferential surface of the casing bell of the rotor by an adhesive layer and pole pieces are similarly affixed to the inner circumferential surface of the pole ring in an assembly having an inner diameter somewhat smaller than the desired final value. A pressure plug is inserted, the outer surface of which has the desired final dimensions, and the assembly is heated, as the result of which the plastoferrite material is permanently deformed, retaining the desired exact dimensions after the removal of the plug. Projections may be provided on the casing bell and on the pole pieces to grasp into the plastoferrite ring.
Inventors
- 👤 Hermann Mittag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:35
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/02; H02K15/03; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2786; H02K1/2787; H02K1/2789; H02K1/279; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012; Y10T29/4902; Y10T29/49075; Y10T29/49076
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
181 words
A method of making a magneto rotor comprising a pot-shaped magnetically conducting casing bell (11) with a hub (14) for mounting on a drive shaft and a pole ring (12) of synthetic material containing embedded magnetic particles on the inner circumference of said casing bell, which method comprises the steps of: applying an adhesive to at least one of the matched circumferential surfaces respectively of said casing bell and of a pole ring of the aforesaid type having magnetized regions and having an inner diameter slightly smaller than the desired final dimension thereof; placing said pole ring in position in said casing bell on the inner circumfernetial surface thereof; introducing inside said pole ring a pressure plug (16) shaped to the desired final inner dimensions of at least the magnetizeD regions of said pole ring and thereby exerting an outward radial force while, warming the assembly and permanently deforming said pole ring to its desired final inner dimension; allowing the assembly to cool and said adhesive to harden and thereby to bind said matched surfaces, and thereafter withdrawing said pressure plug.
Claim 2
Independent Claim
181 words
A method of making a magneto rotor comprising a pot-shaped magnetically conducting casing bell (11) with a hub (14) for mounting on a drive shaft and a pole ring (12) of synthetic material containing embedded magnetic particles on the inner circumference of said casing bell, which method comprises the steps of: applying an adhesive to at least one of the matched circumferential surfaces respectively of said casing bell and of a pole ring of the aforesaid type having magnetized regions and having an inner diameter slightly smaller than the desired final dimension thereof; placing said pole ring in position in said casing bell on the inner circumfernetial surface thereof; introducing inside said pole ring a pressure plug (16) shaped to the desired final inner dimensions of at least the magnetizeD regions of said pole ring and thereby exerting an outward radial force while, warming the assembly and permanently deforming said pole ring to its desired final inner dimension; allowing the assembly to cool and said adhesive to harden and thereby to bind said matched surfaces, and thereafter withdrawing said pressure plug.
Claim 3
Dependent Claim
189 words
A method as defined in claim 1 which also includes the step of affixing pole pieces (13) to the inner circumferential surface of said pole ring (12), said pole pieces having surfaces matched to the shape of the inner surfaces of the magnetized regions of the said pole ring for mounting thereon, by applying an adhesive to at least one of said matched surfaces respectively of said pole ring (12) and of said pole pieces (13), and in which said pressure plug (16) is shaped to the desired final spacing of inward facing pole face surfaces (13a) of said pole pieces as finally disposed with respect to each other, so that the introduction of said pressure plug (16) inside said pole ring takes place also inside said pole pieces and serves to exert outward radial force against said pole pieces as well as indirectly against said pole ring, pressing said pole pieces (13) against the inner surface of the magnetized zones of said pole ring (12), after which said adhesive is allowed to harden to secure said pole pieces to said pole ring before said pressure plug is removed.
Claim 4
Dependent Claim
35 words
A method as defined in claim 1 in which the adhesive (15) is warmed and becomes fluid when warmed and thereby binds the matched surfaces of said casing bell (11) and said pole ring (12).
Claim 5
Dependent Claim
45 words
A method as defined in claim 2 in which an adhesive (15, 17) is used which becomes fluid upon warming and is warmed and thereby binds the matched surfaces of said casing bell (11) and said pole ring (12) and of said pole pieces (13).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |