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US4271368A Expired / Lapsed US ⏱️ 0.0 years remaining

Rotor assembly having shroud with replaceable knock-outs

Assignee: General Electric Co
•
Filing: 1978-10-25
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Granted: 1981-06-02
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Expires: 1998-10-25
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Abstract

Abstract This patent discloses methods of manufacturing rotors particularly adapted for use in hermetically sealed motor-compressor units of the type to be utilized for refrigeration applications. Previously known standard manufacturing steps are followed in producing a rotor having counterweights at one end thereof secured to the rotor by any suitable fastening means. Practice of the present invention results in rotors that include a shroud overlying the counterweights. In the manufacture of the shroud itself, I locate a centrally disposed region and define such region by piercing the shroud material along a major portion of its perimeter, but retain at least two tabs or ears which interconnect the centrally disposed portion of the shroud with the remainder of the shroud. The resulting shroud preferably has a centrally disposed portion which then may be separated from the remainder of the shroud by fracturing the interconnecting tabs in order to expose the rotor shaft. Thereafter, the shaft may be pressed out of the rotor, and the central portion of the shroud retained. Subsequently, the central portion of the shroud is relocated on the remainder of the shroud, pressed into position, and refastened by any suitable means, such as, but not limited to, spot welds, silver solder, brazing, etc. The rotor having a reassembled shroud then is usable in a reassembled compressor.

Inventors

  • 👤 Richard D. Burns

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 04:37
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/04; H02K15/00; H02K15/50

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 183 words
In a rotor assembly for use in a hermetically sealed regrigeration compressor environment wherein the rotor assembly includes a rotor body having a centrally disposed and longitudinally extending bore, a conductive structure carried by the body, a plurality of fastening means extending longitudinally from the conductive structure, and a shroud held in assembled relationship with the rotor body by the fastening means, the improvement wherein: said shroud includes means removably secured thereto for preventing gases from moving longitudinally therepast and toward the longitudinally extending bore; said means removably secured to said shroud including a plug attached to and forming a part of said shroud; said plug being attached to the remainder of said shroud by at least two tabs that each are a unitary structural part of both the plug and the remainder of the shroud, said at least two tabs establishing ramps that interconnect the plug and remainder of the shroud, said ramps lying at a predetermined angle relative to the plane of the remainder of the shroud, and said plug being offset from the plane of the remainder of the shroud.
Claim 2
Dependent Claim 183 words
In a rotor assembly for use in a hermetically sealed regrigeration compressor environment wherein the rotor assembly includes a rotor body having a centrally disposed and longitudinally extending bore, a conductive structure carried by the body, a plurality of fastening means extending longitudinally from the conductive structure, and a shroud held in assembled relationship with the rotor body by the fastening means, the improvement wherein: said shroud includes means removably secured thereto for preventing gases from moving longitudinally therepast and toward the longitudinally extending bore; said means removably secured to said shroud including a plug attached to and forming a part of said shroud; said plug being attached to the remainder of said shroud by at least two tabs that each are a unitary structural part of both the plug and the remainder of the shroud, said at least two tabs establishing ramps that interconnect the plug and remainder of the shroud, said ramps lying at a predetermined angle relative to the plane of the remainder of the shroud, and said plug being offset from the plane of the remainder of the shroud.
Claim 3
Dependent Claim 33 words
The invention of claim 1, wherein the plug is compressively retained within the remainder of the shroud by strains established around the periphery of the plug at the time of original manufacture thereof.
Claim 4
Dependent Claim 16 words
The invention of claim 1 wherein the predetermined angle is at least approximately about forty-five degrees.
Claim 5
Dependent Claim 12 words
The invention of claim 1 wherein the tabs define predetermined fracture lines.
Claim 6
Dependent Claim 21 words
The invention of claim 4 wherein the plug is offset from the remainder of the shroud longitudinally toward the rotor body.
Claim 7
Dependent Claim 48 words
The invention of claim 4 wherein the minimum transverse dimension across the plug is less than the transverse distance between two of the fastening means whereby the plug can be moved transversely between such two fastening means upon separation of the plug from the remainder of the shroud.
Claim 8
Dependent Claim 26 words
The invention of claim 1 wherein at least one counterweight is trapped under the shroud and held fast on at least one of the fastening means.
Claim 9
Dependent Claim 27 words
The invention of claim 1 wherein a rotor shaft is held fast in the longitudinally extending bore and wherein the plug overlies an end of said shaft.
Claim 10
Dependent Claim 34 words
The invention of claim 1 wherein said at least two tabs lie on an imaginary line about which the plug may be twisted during separation of the plug from the remainder of the shroud.
Claim 11
Dependent Claim 31 words
The invention of claim 2 wherein the shroud constitutes a substantially vibration free structure at least partly because of the compressive retention of the plug in the remainder of the shroud.

References Cited (Backward Citations)

US1509737A Cited
US2744202A Cited
US3067690A Cited
US3313968A Cited
US3518467A Cited
US4132912A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-06-01 1984-12-01 1985-06-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-06-01 1988-12-01 1989-06-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-06-01 1992-12-01 1993-06-02 $7700.00 Window Closed / Lapsed

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