US20060127261A1 - Scroll compressor with complex fillets between eccentric pin and shaft shoulder - Google Patents
Scroll compressor with complex fillets between eccentric pin and shaft shoulder Download PDFInfo
- Publication number
- US20060127261A1 US20060127261A1 US11/010,933 US1093304A US2006127261A1 US 20060127261 A1 US20060127261 A1 US 20060127261A1 US 1093304 A US1093304 A US 1093304A US 2006127261 A1 US2006127261 A1 US 2006127261A1
- Authority
- US
- United States
- Prior art keywords
- eccentric pin
- curvature
- fillets
- radius
- scroll compressor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
- F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
- F04C29/0057—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions for eccentric movement
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/211—Eccentric
Abstract
Description
- This application relates to a scroll compressor wherein an eccentric pin extending forwardly of a rotating shaft shoulder is formed to have fillets at its roots that have a complex shape, to reduce the likelihood of fatigue.
- Scroll compressors are becoming widely utilized in refrigerant compression applications. In a scroll compressor, a pair of scroll members each have a base with a generally spiral wrap extending from the bases. One of the two scroll members is caused to orbit relative to the other.
- In one major style of scroll compressors, the one scroll member is caused to orbit by a rotating shaft being driven by an electric motor. The rotating shaft has a pin formed to extend eccentrically from an end of the shaft, and into a boss in the one scroll member. A slider block is positioned between the eccentric pin and the boss. Rotation of the shaft causes an orbiting movement of the one scroll member through the interaction of the eccentric pin and the slider block.
- In the prior art, the surface between the eccentric pin and an end of the shaft, or the shaft shoulder, has fillets formed along a single radius. The eccentric pin has generally had a relatively flat surface that engages a surface in the slider block, and a circular surface extending between circumferential ends of the flat surface. There have been distinct fillets at both the circular portion and in the flat portion, however, both fillets have been formed along a single radius.
- Due to size issues, the fillets have not been able to be as large as may be desirable. Because of this, the ends or tangent portions of the fillets, are relatively close to the shaft shoulder. As the forces encountered by the eccentric pin in causing the one scroll member increase, such as may be the case with increasing capacity for the scroll compressor, there is a greater likelihood of fatigue of the eccentric pin. While these issues could be addressed by increasing the size of the eccentric pin, or simply increasing the radius of the fillet, such changes would require an increase in the size of the scroll compressor. A size increase would be undesirable.
- In a disclosed embodiment of this invention, the fillet between the eccentric pin and the shaft shoulder at both the curved portion and the flat portion is formed to be more complex than a single radius. In one embodiment, a pair of radii are utilized with a larger radius merging into the outer diameter of the eccentric pin, and a smaller radius connecting from the larger radius and merging into the shaft shoulder. A pair of radii are utilized at both the flat surface, and at the curved portion. With this invention, a larger radius is provided at a high stress portion adjacent the outer periphery of the eccentric pin, while the smaller radius portion ensures that the eccentric pin, and the shaft, need not be formed to have a greater diameter.
- In another embodiment, the complex surface is formed by an ellipse, such that varying radii are provided along the fillet.
- These and other features of the present invention can be best understood from the following specification and drawings, the following of which is a brief description.
-
FIG. 1 shows a scroll compressor incorporating the present invention. -
FIG. 2 is a cross-sectional view through a portion of theFIG. 1 scroll compressor. -
FIG. 3A shows a prior art shaft and eccentric pin. -
FIG. 3B is a top view of theFIG. 3A prior art. -
FIG. 4 shows an inventive shaft and eccentric pin. -
FIG. 5 shows a second embodiment shaft and eccentric pin. - A
scroll compressor 20 is illustrated inFIG. 1 having anelectric motor 22 for causing ashaft 24 to rotate. As known, an orbiting scroll 26 interfits with anon-orbiting scroll 28.Orbiting scroll 26 carries a generallyspiral wrap 30, andnon-orbiting scroll 28 carries a generallyspiral wrap 32. The wraps interfit to define compression chambers that are reduced in volume as the orbitingscroll 26 is caused to orbit. As known, aboss 34 extends downwardly from theorbiting scroll 26 and receives aneccentric pin 36 extending forwardly of theshaft 24. Aslider block 38 sits between theeccentric pin 36 an theboss 34. - As shown in
FIG. 2 , theshaft 24 has theeccentric pin 36 extending upwardly into theslider block 38, and received within theboss 34. As known, flat surfaces on theeccentric pin 36 and theslider block 38 interfit to define a thrust surface for causing movement of the orbitingscroll 26 when theshaft 24 rotates. -
FIG. 3A shows a prior arteccentric pin 39 that has a generallycurved portion 42 having afillet 44, and a generallyflat portion 40 having afillet 46.FIG. 3B shows theflat portion 40 and thecurved portion 42. - As can be appreciated from
FIG. 3A , thefillet 46 and thefillet 44 are both formed to have a single radius of curvature, and thus have the problem as described above. -
FIG. 4A shows a first embodimenteccentric pin 60, wherein theflat portion 62 has a fillet formed of a compound surface with a first relativelylarge radius portion 68 extending to an outer surface of theeccentric pin 60, and a second relativelysmall radius portion 70 extending to ashoulder 71 of the shaft. Amerge point 69 blends the two portions. - The
curved portion 64 hassimilar portions 72 and 74 extending to theshoulder 71. A merge point 75 blends the two portions. - In preferred embodiments, the radius for
portion 68 may be and the radius forportion 70 may be ______, with the radius forportion 72 being ______ and the radius for portion 74 being ______. Of course, other radii may be utilized within the scope of this invention. -
FIG. 5 shows another embodiment 80 wherein the fillets are formed to generally have the shape of an ellipse, such that there is a relativelylarge radius portion 82 at one end and adecreasing radius portion 86 extending to a relativelysmaller radius portion 87 extending to theshoulder 84, andsimilar portions - The present invention thus provides an eccentric pin extending from a shaft in a scroll compressor that is less likely to suffer from fatigue, but which does not require any dimensional changes in the sizes of the shaft, eccentric pin, slider block, or the orbiting scroll.
- Although a preferred embodiment of this invention has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this invention. For that reason, the following claims should be studied to determine the true scope and content of this invention.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/010,933 US7063522B1 (en) | 2004-12-13 | 2004-12-13 | Scroll compressor with complex fillets between eccentric pin and shaft shoulder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/010,933 US7063522B1 (en) | 2004-12-13 | 2004-12-13 | Scroll compressor with complex fillets between eccentric pin and shaft shoulder |
Publications (2)
Publication Number | Publication Date |
---|---|
US20060127261A1 true US20060127261A1 (en) | 2006-06-15 |
US7063522B1 US7063522B1 (en) | 2006-06-20 |
Family
ID=36584118
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/010,933 Expired - Fee Related US7063522B1 (en) | 2004-12-13 | 2004-12-13 | Scroll compressor with complex fillets between eccentric pin and shaft shoulder |
Country Status (1)
Country | Link |
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US (1) | US7063522B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060254309A1 (en) * | 2005-05-11 | 2006-11-16 | Denso Corporation | Fluid machine |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7273362B2 (en) * | 2005-07-06 | 2007-09-25 | Scroll Technologies | Scroll compressor with an eccentric pin having a higher contact point |
JP6805391B2 (en) | 2017-08-08 | 2020-12-23 | 日立ジョンソンコントロールズ空調株式会社 | Rotary compressor and its assembly method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5496158A (en) * | 1994-12-22 | 1996-03-05 | Carrier Corporation | Drive for scroll compressor |
US6361297B1 (en) * | 2000-09-15 | 2002-03-26 | Scroll Technologies | Scroll compressor with pivoting slider block and improved bore configuration |
US6428294B1 (en) * | 2001-02-13 | 2002-08-06 | Scroll Technologies | Scroll compressor with slider block having circular inner bore |
-
2004
- 2004-12-13 US US11/010,933 patent/US7063522B1/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5496158A (en) * | 1994-12-22 | 1996-03-05 | Carrier Corporation | Drive for scroll compressor |
US6361297B1 (en) * | 2000-09-15 | 2002-03-26 | Scroll Technologies | Scroll compressor with pivoting slider block and improved bore configuration |
US6428294B1 (en) * | 2001-02-13 | 2002-08-06 | Scroll Technologies | Scroll compressor with slider block having circular inner bore |
US6585502B2 (en) * | 2001-02-13 | 2003-07-01 | Scroll Technologies | Scroll compressor with slider block having circular portions in an inner bore |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060254309A1 (en) * | 2005-05-11 | 2006-11-16 | Denso Corporation | Fluid machine |
Also Published As
Publication number | Publication date |
---|---|
US7063522B1 (en) | 2006-06-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SCROLL TECHNOLOGIES, ARKANSAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SUN, ZILI;REEL/FRAME:016088/0416 Effective date: 20041210 |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.) |
|
LAPS | Lapse for failure to pay maintenance fees |
Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.) |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20180620 |