Patent US4603474A successfully refreshed from Google Patents.
US4603474A
Expired / Lapsed
US
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Collector for an electric machine and method for its production
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1984-05-17
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Granted: 1986-08-05
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Expires: 2004-05-17
Abstract
Abstract A collector for electric machines, including a rotationally symmetrical sintered ceramic body and a plurality of radially disposed metallic segments which are separated from each other by one interspace each and which are bonded to the ceramic body via a eutectic intermediate layer. The segments are bonded to the ceramic body in accordance with the eutectic method by being surface-oxidized on their inside narrow side and radially pressed against the ceramic body with the totality being brought to the melting temperature corresponding to the metal/metal-oxide eutectic and subsequently being cooled down again. A preferred embodiment includes: copper segments on an Al 2 O 3 ceramic body.
Inventors
- 👤 Jens Gobrecht
- 👤 Claus Schuler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:01
CPC Classifications
H; H01; H01R; H01R43/00; H01R43/06; Y; Y10; Y10S; Y10S228/00; Y10S228/903; Y10S29/00; Y10S29/048; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49011
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
51 words
A collector for an electric machine, comprising: a rotationally symmetrical central sintered ceramic body having a jacket surface; and radially positioned surface-oxidized metallic segments disposed on said jacket surface, said segments separated from each other by an interspace and bonded to said jacket surface by means of a eutectic intermediate layer.
Claim 2
Dependent Claim
51 words
A collector for an electric machine, comprising: a rotationally symmetrical central sintered ceramic body having a jacket surface; and radially positioned surface-oxidized metallic segments disposed on said jacket surface, said segments separated from each other by an interspace and bonded to said jacket surface by means of a eutectic intermediate layer.
Claim 3
Dependent Claim
59 words
A collector as claimed in claim 1, wherein said ceramic body comprises a material selected from the group consisting of densely sintered aluminum oxide, aluminum oxide doped with zirconium oxide, and zirconium oxide, the metallic segments comprise a material selected from the group consisting of copper and a copper alloy, and the intermediate layer consists of the copper/copper-oxide eutectic.
Claim 4
Dependent Claim
32 words
A collector as claimed in claim 1, wherein the ceramic body has a smooth cylindrical jacket surface and the segments have inside tangential planar boundary surfaces adjacent said smooth cylindrical jacket surface.
Claim 5
Dependent Claim
19 words
A collector as claimed in claim 1, wherein the ceramic body has outer boundary surface including slots and lands.
Claim 6
Dependent Claim
22 words
A collector as claimed in claim 1, wherein the metallic segments have faces defining a radial height which decreases towards an end.
Claim 7
Dependent Claim
16 words
A collector as claimed in claim 1, wherein the metallic segments have faces including stress-relieving notches.
Claim 8
Independent Claim
101 words
A method for producing a collector for an electric machine, comprising: initially sintering a rotationally symmetrical ceramic body having a jacket surface; surface-oxidizing a plurality of metallic segments; disposing the surface-oxidized segments around the jacket surface of the ceramic body; exerting a radially acting press-on pressure on the ceramic body and the segments; heating the ceramic body and the segments with pressure exerted thereon in a furnance to a temperature required for generating a metal/metal-oxide eutectic such that said ceramic body is eutectically bonded to said metal segments; and cooling down to room temperature the bonded ceramic body and metallic segments.
Claim 9
Independent Claim
101 words
A method for producing a collector for an electric machine, comprising: initially sintering a rotationally symmetrical ceramic body having a jacket surface; surface-oxidizing a plurality of metallic segments; disposing the surface-oxidized segments around the jacket surface of the ceramic body; exerting a radially acting press-on pressure on the ceramic body and the segments; heating the ceramic body and the segments with pressure exerted thereon in a furnance to a temperature required for generating a metal/metal-oxide eutectic such that said ceramic body is eutectically bonded to said metal segments; and cooling down to room temperature the bonded ceramic body and metallic segments.
Claim 10
Dependent Claim
60 words
A method as claimed in claim 7, wherein a ceramic body of aluminum oxide is densely sintered and bonded to segments of copper to produce a eutectic intermediate layer by bringing said ceramic body and said copper segments to a temperature of 1,072±7° C. and subsequently cooling said aluminum oxide ceramic body and said copper segments down to room temperature.
Claim 11
Dependent Claim
116 words
A method as claimed in claim 7, comprising: providing a copper plate having on one side thereof parallel rectangular longitudinal slots of a predetermined width corresponding to a tangential distance between the segments; bending said plate around the ceramic body such that the longitudinal slots lie on the inside and parallel to the longitudinal axis of the ceramic body, the outside forming a smooth cylindrical body; clamping said body with said plate in a device exerting radial compressive forces; heating said clamped body and plate to the eutectic temperature; cooling down said heated clamped body and plate again to room temperature; and desurfacing the outside cylindrical copper jacket down to where the longitudinal slots break through.
References Cited (Backward Citations)
US2837671A
Cited
US3777367A
Cited
US3744120A
Cited
US3766634A
Cited
US3911553A
Cited
DE2510597A1
Cited
US4035908A
Cited
US4369566A
Cited
US4505418A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |