US4710111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary compressor with oil groove between journal and journal bearing
Assignee: Toshiba Corp
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Filing: 1986-03-10
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Granted: 1987-12-01
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Expires: 2006-03-10
Abstract
Abstract A rotary compressor which essentially includes a journal, a compression mechanism including a cylinder and a rolling piston provided on the journal to suck, compress and discharge refrigerant gas by rotating the rolling piston eccentrically in the interior of the cylinder, a motor to drive the journal, a journal bearing to support freely to rotate the journal, and an axial direction oil groove to introduce a lubricating oil into a gap between the journal and the journal bearing, the axial direction oil groove being formed along the axial direction of the journal at a position corresponding to a low pressure area of an oil film of the lubricating oil caused by a deflection of the journal due to the eccentric rotation of the rolling piston.
Inventors
- 👤 Masahiro Kubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:33
CPC Classifications
F; F04; F04C; F04C29/00; F04C29/02; F04C29/023; F04C18/00; F04C18/30; F04C18/34; F04C18/356
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
137 words
Rotary compressor comprising: a journal having an eccentric portion; compression means including a cylinder and a rolling piston provided on said journal to suck, compress and discharge refrigerant gas by rotating said rolling piston eccentrically in the interior of said cylinder; a motor to drive said journal; journal bearing means for freely rotatably supporting said journal; and an axial direction oil groove to introduce a lubricating oil into a gap between said journal and journal bearing means, wherein each axial portion of said axial direction oil groove is positioned on said journal in a circumferential position determined to correspondence to a low pressure area of an oil film of said lubricating oil caused by a deflection of said journal due to dynamic imbalances in said journal, including dynamic imbalances arising from the eccentricity of said rolling piston.
Claim 2
Dependent Claim
137 words
Rotary compressor comprising: a journal having an eccentric portion; compression means including a cylinder and a rolling piston provided on said journal to suck, compress and discharge refrigerant gas by rotating said rolling piston eccentrically in the interior of said cylinder; a motor to drive said journal; journal bearing means for freely rotatably supporting said journal; and an axial direction oil groove to introduce a lubricating oil into a gap between said journal and journal bearing means, wherein each axial portion of said axial direction oil groove is positioned on said journal in a circumferential position determined to correspondence to a low pressure area of an oil film of said lubricating oil caused by a deflection of said journal due to dynamic imbalances in said journal, including dynamic imbalances arising from the eccentricity of said rolling piston.
Claim 3
Dependent Claim
62 words
Rotary compressor according to claim 1, wherein said journal defines a hollow section penetrating it in the axial direction of said journal, and a lubricating hole passing through said journal to couple said hollow section with an outer surface of said journal to feed said lubricating oil from said hollow section to said gap between said journal bearing means and said journal.
Claim 4
Dependent Claim
29 words
Rotary compressor according to claim 2, wherein said journal bearing means has formed at its inner surface a circumferential oil groove in a position corresponding to said lubricating hole.
Claim 5
Dependent Claim
35 words
Rotary compressor according to claim 2, wherein said journal is provided with at least one balancer to compensate for the eccentricity of said rolling piston, wherein said dynamic imbalances include those arising from said balancer.
Claim 6
Dependent Claim
29 words
Rotary compressor according to claim 4, wherein one said balancer is provided on said journal at each side of said compression means in the axial direction of said journal.
Claim 7
Dependent Claim
77 words
Rotary compressor according to claim 4 or 5, wherein said journal bearing means supports said journal at the side of said compression means opposite to said motor and said position of said axial direction oil groove at an end farthest from said compression means is set inthe range of from 180 degress to 360 degrees, in a journal rotational direction, from a blade of said compression means which reciprocates to keep in contact with said rolling piston.
Claim 8
Dependent Claim
78 words
Rotary compressor according to claim 4 or 5, wherein said journal bearing means supports said journal at the side of said compression means opposite to said motor and said position of said axial direction oil groove at an end adjacent to said compression means is set in the range of from 205 degrees to 295 degrees, in a journal rotational direction, from a blade of said compression means which reciprocates to keep in contact with said rolling piston.
Claim 9
Dependent Claim
77 words
Rotary compressor according to claim 4 or 5, wherein said journal bearing means supports said journal at the position between said compression means and said motor and the position of said axial direction oil groove at an end adjacent to said compression means is set in the range of from 225 degrees to 315 degrees, in a journal rotational direction, from a blade of said compression means which reciprocates to keep in contact with said rolling piston.
Claim 10
Dependent Claim
76 words
Rotary compressor according to claim 4 or 5, wherein said journal bearing means supports said journal at the position between said compression means and said motor and the position of said axial direction oil groove at an end adjacent to said motor is set in the range of from 45 degrees to 225 degrees, in a journal rotational direction, from a blade of said compression means which reciprocates to keep in contact with said rolling piston.
Claim 11
Dependent Claim
19 words
Rotary compressor according to claim 4, wherein one said balancer is provided at both sides of said compression means.
Claim 12
Dependent Claim
30 words
Rotary compressor according to claim 1, wherein said axial direction oil groove is formed by turning at least one turn from one end to another end of said bearing surface.
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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) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |