US4242065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sliding vane compressor with end face inserts or rotor
Assignee: Robert Bosch GmbH
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Filing: 1978-11-15
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Granted: 1980-12-30
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Expires: 1998-11-15
Abstract
Abstract A sliding vane compressor has a housing and a rotor mounted in the housing. The rotor has axial endfaces which are juxtaposed with respective housing surfaces from which they must be kept at a predetermined spacing. This spacing is obtained by mounting in open recesses of the axial rotor endfaces respective elements of a material having a higher coefficient of thermal expansion than the material of the rotor itself. As the compressor comes up to operating temperatures the resulting thermal expansion of these elements causes them to protrude beyond the axial rotor endfaces by a distance corresponding to the desired spacing.
Inventors
- 👤 Yutaka Ishizuka
- 👤 Shinichi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:40
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
157 words
In a sliding vane compressor of the type having a housing and a rotor journalled for rotation in a chamber of the housing so that the axial endfaces of the rotor are juxtaposed with slight clearance relative to the cooperating housing surfaces, a combination comprising means bounding a plurality of recess in each axial end face of the rotor; and an insert received in each of said recesses and being of a material having a relatively low coefficient of friction and having a coefficient of thermal expansion which is higher than that of the material of the rotor so that, upon reaching a predetermined temperature, said inserts expand and extend across the respective clearance into contact with said housing surfaces to prevent direct contact between the same and said axial endfaces of the rotor, said inserts having outer faces exposed at said axial end faces and being flush with the same at temperatures below said predetermined temperature.
Claim 2
Dependent Claim
157 words
In a sliding vane compressor of the type having a housing and a rotor journalled for rotation in a chamber of the housing so that the axial endfaces of the rotor are juxtaposed with slight clearance relative to the cooperating housing surfaces, a combination comprising means bounding a plurality of recess in each axial end face of the rotor; and an insert received in each of said recesses and being of a material having a relatively low coefficient of friction and having a coefficient of thermal expansion which is higher than that of the material of the rotor so that, upon reaching a predetermined temperature, said inserts expand and extend across the respective clearance into contact with said housing surfaces to prevent direct contact between the same and said axial endfaces of the rotor, said inserts having outer faces exposed at said axial end faces and being flush with the same at temperatures below said predetermined temperature.
Claim 3
Dependent Claim
15 words
A combination as defined in claim 1, wherein said material of said inserts is aluminum.
Claim 4
Dependent Claim
11 words
A combination as defined in claim 1, said inserts being plate-shaped.
Claim 5
Dependent Claim
18 words
A combination as defined in claim 1, wherein said predetermined temperature is the operating temperature of the compressor.
Claim 6
Dependent Claim
45 words
A combination as defined in claim 1, said recesses being hollows extending in said rotor, and said inserts each having at least one passage communicating with the respective hollow so that oil admitted into said hollows can circulate through said passages out of said hollows.
Claim 7
Dependent Claim
17 words
A combination as defined in claim 5, said one passage being provided centrally in the respective insert.
Claim 8
Dependent Claim
30 words
A combination as defined in claim 5, said outer exposed faces of said inserts project slightly outwardly beyond the respective axial endface prior to said rotor reaching said predetermined temperatures.
Claim 9
Dependent Claim
19 words
A combination as defined in claim 7, wherein said faces project beyond said axial endfaces by about 0.002 mm.
Claim 10
Dependent Claim
36 words
A combination as defined in claim 1, said inserts having exposed outer faces which, when said rotor is at said predetermined temperature, project beyond said axial endfaces by a distance of up to about 0.1 mm.
Claim 11
Dependent Claim
18 words
A combination as defined in claim 9, wherein said faces project by between 0.002 mm and 0.03 mm.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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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) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |