Patent US4861372A successfully refreshed from Google Patents.
US4861372A
Expired / Lapsed
US
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Roller in rotary compressor and method for producing the same
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1988-11-14
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Granted: 1989-08-29
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Expires: 2008-11-14
Abstract
Abstract Disclosed is a roller for use in a rotary compressor, which roller comprising a sintered body consisting essentially of 0.5-2.0% by weight of C, 1.0-5.0% by weight of Cu, 0.5-3.5% by weight of Cr, 0.1-1.0% by weight of Co, 0.1-1.0% by weight of W and a balance Fe and unavoidable impurities. Hard particles of Cr-Co-W alloy are dispersed in one of pearlitic and tempering martensitic matrix, and sintered pores of the sintered body are sealed with tri-iron tetroxide. Resultant sintered body has high wear resistance and scuffing resistance capable of being used as an inverter type compressor.
Inventors
- 👤 Soichi Shimomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:18
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; B; B22; B22F; B22F3/00; B22F3/24; F; F01; F01C; F01C21/00; F01C21/08; F04; F04C; F04C2230/00; F04C2230/20; F04C2230/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
A roller for use in a rotary compressor, which roller comprising a sintered body consisting essentially of 0.5-2.0% by weight of C, 1.0-5.0% by weight of Cu, 0.5-3.5% by weight of Cr, 0.1-1.0% by weight of Co, 0.1-1,0% by weight of W and a balance Fe and unavoidable impurities; and wherein hard particles of Cr-Co-W alloy are dispersed in one of pearlitic and tempering martensitic matrix, and sintered pores of said sintered body are sealed with tri-iron tetroxide.
Claim 2
Dependent Claim
78 words
A roller for use in a rotary compressor, which roller comprising a sintered body consisting essentially of 0.5-2.0% by weight of C, 1.0-5.0% by weight of Cu, 0.5-3.5% by weight of Cr, 0.1-1.0% by weight of Co, 0.1-1,0% by weight of W and a balance Fe and unavoidable impurities; and wherein hard particles of Cr-Co-W alloy are dispersed in one of pearlitic and tempering martensitic matrix, and sintered pores of said sintered body are sealed with tri-iron tetroxide.
Claim 3
Independent Claim
160 words
A method for producing a roller for use in a rotary compressor, said roller being formed of a sintered body produced by the steps of; mixing together 0.9 to 1.9% by weight of graphite powders, 2.5 to 4.0% by weight of pure copper powders, 1.0 to 5.0% by weight of alloy powders mainly consisting of Cr, Co and W and balance pure iron powders to obtain a powder mixture; compacting said powder mixture to form a powder compact; sintering said powder compact to obtain a sintered body formed with sintered pores; and, steam treating said sintered body to seal said sintered pores, a resultant sintered body consisting essentially of 0.5-2.0% by weight of C, 1.0-5.0% by weight of Cu, 0.5-3.5% by weight of Cr, 0.1-1.0% by weight of Co, 0.1-1.0% by weight of W and a balance Fe and unavoidable impurities; hard particles of Cr-Co-W alloy being dispersed in pearlitic matrix, and said sintered pores being sealed with tri-iron tetroxide.
Claim 4
Independent Claim
160 words
A method for producing a roller for use in a rotary compressor, said roller being formed of a sintered body produced by the steps of; mixing together 0.9 to 1.9% by weight of graphite powders, 2.5 to 4.0% by weight of pure copper powders, 1.0 to 5.0% by weight of alloy powders mainly consisting of Cr, Co and W and balance pure iron powders to obtain a powder mixture; compacting said powder mixture to form a powder compact; sintering said powder compact to obtain a sintered body formed with sintered pores; and, steam treating said sintered body to seal said sintered pores, a resultant sintered body consisting essentially of 0.5-2.0% by weight of C, 1.0-5.0% by weight of Cu, 0.5-3.5% by weight of Cr, 0.1-1.0% by weight of Co, 0.1-1.0% by weight of W and a balance Fe and unavoidable impurities; hard particles of Cr-Co-W alloy being dispersed in pearlitic matrix, and said sintered pores being sealed with tri-iron tetroxide.
Claim 5
Independent Claim
169 words
A method for producing a roller for use in a rotary compressor, said roller being formed of a sintered body produced by the steps of; mixing together 0.9 to 1.9% by weight of graphite powders, 2.5 to 4.0% by weight of pure copper powders, 1.0 to 5.0% by weight of alloy powders mainly consisting of Cr, Co and W and balance pure iron powders to obtain a powder mixture; compacting said powder mixture to form a powder compact; sintering said powder compact to obtain a sintered body formed with sintered pores; hardening said sintered body; steam treating said hardened sintered body to seal said sintered pores; and, tempering said sintered body, a resultant sintered body consisting essentially of 0.5-2.0% by weight of C, 1.0-5.0% by weight of Cu, 0.5-3.5% by weight of Cr, 0.1-1.0% by weight of Co, 0.1-1,0% by weight of W and a balance Fe and unavoidable impurities; hard particles of Cr-Co-W alloy being dispersed in martensitic matrix, and said sintered pores being sealed with tri-iron tetroxide.
Claim 6
Independent Claim
169 words
A method for producing a roller for use in a rotary compressor, said roller being formed of a sintered body produced by the steps of; mixing together 0.9 to 1.9% by weight of graphite powders, 2.5 to 4.0% by weight of pure copper powders, 1.0 to 5.0% by weight of alloy powders mainly consisting of Cr, Co and W and balance pure iron powders to obtain a powder mixture; compacting said powder mixture to form a powder compact; sintering said powder compact to obtain a sintered body formed with sintered pores; hardening said sintered body; steam treating said hardened sintered body to seal said sintered pores; and, tempering said sintered body, a resultant sintered body consisting essentially of 0.5-2.0% by weight of C, 1.0-5.0% by weight of Cu, 0.5-3.5% by weight of Cr, 0.1-1.0% by weight of Co, 0.1-1,0% by weight of W and a balance Fe and unavoidable impurities; hard particles of Cr-Co-W alloy being dispersed in martensitic matrix, and said sintered pores being sealed with tri-iron tetroxide.
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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |