Scroll compressor having upper and lower bearing housings and a method of testing and assembling the compressor

We claim:

1. A method of testing a hermetic scroll-type compressor prior to final assembly of said compressor in said shell, said method comprising:

assembling a scroll-type compressor including a driving motor,

connecting said driving motor to a power source,

energizing said motor to operate said compressor, and

thereafter installing said compressor in a hermetically sealed shell.

2. A method of testing a hermetic scroll-type compressor as set forth in claim 1 further comprising providing means to supply lubricant to said compressor prior to energizing said motor.

3. A method of testing a hermetic scroll-type compressor as set forth in claim 1 wherein said compressor is placed in a support stand prior to energizing said motor.

4. A method of testing a hermetic scroll-type compressor as set forth in claim 1 wherein said scroll-type compressor is installed in said hermetic shell by pressfitting.

5. A method of testing a hermetic scroll-type compressor as set forth in claim 4 wherein said drive motor includes a stator and said scroll-type compressor includes a lower housing member surrounding said stator, said lower housing member including peripheral wall portions being pressfitted into said shell and operating to support said motor and compressor within said shell.

6. A scroll-type machine comprising:

a first scroll member including a first end plate having a first spiral wrap disposed on said first end plate;

a second scroll member including a second end plate having a second spiral wrap disposed on said second end plate;

a drive shaft drivingly coupled to said second scroll member for effecting orbital movement of said second scroll member relative to said first scroll member;

motor means including a rotor secured to said drive shaft and a stator surrounding said rotor;

a stationary body, said stationary body including

a first member supporting said first and second scroll members for relative orbital movement,

a second member for supporting said stator in a surrounding position relative to said rotor,

said first and second members including interengaging locating means for accurately radially and axially positioning said first and second members relative to each other; and

fastening means for securing said first and second members together.

7. A scroll-type machine as set forth in claim 6 wherein said first member includes first bearing means for rotatably supporting said drive shaft and said second member includes second bearing means for rotatably supporting said drive shaft.

8. A scroll-type machine as set forth in claim 7 wherein said motor means is positioned between said first and second bearing means,

9. A scroll-type machine as set forth in claim 6 further comprising a hermetically sealed outer shell, one of said first and second members being pressfitted within said shell and being operative to support said compressor therein.

10. A scroll-type machine as set forth in claim 9 wherein the other of said first and second members is positioned in spaced relationship to said shell.

11. A scroll-type machine as set forth in claim 10 wherein said one of said first and second members and said shell include interengaging portions for axially locating said compressor within said shell.

12. A scroll-type machine as set forth in claim 6 wherein said first member includes axially compliant mounting means for positioning said first scroll member with respect to said second scroll member.

13. A scroll-type machine as set forth in claim 6 wherein said first member comprises a two piece assembly including a first piece operative to position said first scroll member and a second piece operative to position said second scroll member.

14. A scroll-type machine as set forth in claim 13 wherein said second piece includes bearing means for rotatably supporting said drive shaft.

15. A scroll-type machine as set forth in claim 13 wherein said first and second pieces include interengaging means for accurately positioning said first and second pieces relative to each other.

16. A scroll-type machine as set forth in claim 15 wherein said fastening means secure said first and second pieces together.

17. A scroll-type machine as set forth in claim 13 wherein said first and second pieces define a cavity, said drive shaft extending into said cavity, and counterweight means rotatably supported within said cavity.

18. A method of assembling a scroll-type compressor comprising:

fitting a motor stator into a lower bearing housing;

fitting one end of a drive shaft having a rotor secured thereto into bearing means provided in said lower bearing housing;

assembling an upper bearing housing assembly to said lower bearing housing with said shaft extending therethrough;

assembling a first scroll member having first scroll wrap thereon to the other end of said drive shaft, said first scroll member being supported by said upper bearing housing;

assembling a second scroll member having second wrap thereon to said first scroll member with said second wraps being in intermeshing relationship with said first scroll wraps; and

installing fastening means for securing said upper bearing housing to said lower bearing housing.

19. A method of assembling a scroll-type compressor as set forth in claim 18 wherein said assembling of said upper bearing housing assembly includes assembling a first member of said upper bearing housing to said drive shaft and assembling a second member of said upper bearing housing to said first member, said second member being operative to support said first scroll member and position said second scroll member.

20. A method of assembling a scroll-type compressor as set forth in claim 19 wherein installing said fastening means also secures said first and second members of said upper bearing assembly together.

21. A method of assembling a scroll-type compressor as set forth in claim 18 further comprising pressfitting said lower bearing housing into a hermetically sealed shell with said compressor assembled thereto.

22. A method of assembling a scroll-type compressor as set forth in claim 21 further comprising operationally testing said compressor before pressfitting said lower bearing housing into said shell.

23. A scroll-type machine comprising:

a first scroll member including a first end plate having a first spiral wrap disposed on said end plate;

a second scroll member including a second end plate having a second spiral wrap disposed on said end plate;

a drive shaft drivenly connected to said second scroll member;

motor means including a rotor secured to said drive shaft and a stator positioned in surrounding relationship to said rotor;

a lower bearing housing supporting said stator, said lower bearing housing including lower bearing means rotatably supporting one end of said drive shaft;

an upper bearing assembly engageable with said lower bearing housing, said upper bearing assembly including bearing means for rotatably supporting said drive shaft, said upper bearing assembly including a first surface for axially supporting said second scroll member and a second surface spaced from said first surface for radially positioning said first scroll member; and

fastening means extending between said upper bearing assembly and said lower bearing housing for securing said lower bearing housing and said upper bearing assembly in assembled relationship and thereby positioning said first and second scroll members with respect thereto and with one of said first and second scroll members being axially movable with respect to the other of said first and second scroll members.

24. A scroll-type machine as set forth in claim 23 wherein said fastening means further include stop means, said fastening means being operative to retain said stop means on said upper bearing housing and to secure said upper bearing housing to said lower bearing housing.

25. A scroll-type machine as set forth in claim 24 wherein said stop means operates to retain said first scroll member in assembled relationship to said second scroll member.

26. A scroll-type machine comprising:

a hermetically sealed shell;

a first scroll member including a first end plate having a first spiral wrap disposed on said end plate;

a second scroll member including a second end plate having a second spiral wrap disposed on said end plate;

a drive shaft drivenly connected to said second scroll member;

motor means including a rotor secured to said drive shaft and a stator positioned in surrounding relationship to said rotor;

a lower bearing housing supporting said stator, said lower bearing housing including lower bearing means rotatably supporting one end of said drive shaft;

an upper bearing assembly secured to said lower bearing housing said upper bearing assembly including bearing means for rotatably supporting said drive shaft, said upper bearing assembly including a first surface for axially supporting said second scroll member and a second surface spaced from said first surface for radially positioning said first scroll member;

means for securing said first scroll member, said second scroll member, said lower bearing housing and said upper bearing housing in assembled relationship with one of said first and second scroll members being axially movable with respect to the other of said first and second scroll members;

said lower bearing housing cooperating with said shell to provide the sole support for said compressor within said shell.

27. A scroll-type machine as set forth in claim 26 wherein said lower bearing housing is pressfitted within said shell.

28. A scroll-type machine as set forth in claim 27 wherein said upper bearing assembly is positioned in spaced relationship to said shell.

Description Submit all comments and votes

BACKGROUND AND SUMMARY OF THE INVENTION

The present invention relates generally to scroll machines and more specifically to an improved axially compliant mounting arrangement for scroll type compressors and arrangement for assembling the components thereof together which greatly facilitates the assembly thereof as well as enables testing of the compressor prior to installation of the compressor in the outer shell.

A unique axially compliant mounting arrangement is disclosed in the above referenced parent application Ser. No. 899,003, now U.S. Pat. No. 4,767,293. One embodiment of this mounting arrangement utilizes an elongated leaf spring strap having opposite ends secured to a flange portion provided on the non-orbiting scroll member. The center portion of this strap is secured to a pair of upstanding spaced posts provided on the main bearing housing. A stop flange is provided on the non-orbiting scroll which engages the lower surface of the strap to limit axial movement of the non-orbiting scroll member away from the orbiting scroll. A retainer overlies the center portion of the strap and serves as a backup to aid in limiting this axial separating movement of the non-rotating scroll. While this mounting arrangement offers excellent performance and durability characteristics, it requires a substantial number of components which render it rather costly in terms of both manufacturing and assembly time and material.

Accordingly, the present invention seeks to provide an improved mounting arrangement which offers all of the advantages provided by the above described mounting system but additionally requires fewer components and hence offers substantial cost savings in both manufacturing and assembly. In one embodiment, the non-orbiting scroll member is secured to the main bearing housing by means of a plurality of bolts extending therebetween which allow limited relative axial movement between the bearing housing and the non-orbiting scroll member. In another embodiment, a separate annular ring is fixedly secured to the bearing housing in surrounding relationship to the non-orbiting scroll member and includes abutment surfaces operative to allow limited relative axial movement of the non-orbiting scroll. A third embodiment is disclosed which is similar to the second embodiment except that the annular ring is integrally formed with a portion of a two piece main bearing housing and separate axial stop means and anti-rotation means are provided. In this embodiment, the two piece main bearing housing is designed to be secured to a lower bearing housing into which the motor stator is fitted. Thus, the entire compressor may be assembled and tested if desired prior to installation of the compressor assembly in the outer hermetic shell. Additionally, this arrangement eliminates the reliance on the outer shell for relative positioning and/or alignment of the components. In a fourth embodiment, an annular stamped ring is pressfitted or otherwise fixedly secured to the non-orbiting scroll and bolted to the bearing housing. The stamped ring offers sufficient flexibility to allow limited axial movement of the non-orbiting scroll.

Each of these embodiments offer distinct advantages with respect to overcoming the often conflicting problems of minimizing the amount of high precision machining required, the need for accurately positioning the non-orbiting scroll member relative to the orbiting scroll member, minimizing the number of components required and hence the complexity and time required for assembly as well as minimizing costs without loss of durability and/or reliability of the resulting scroll compressor.

Additional advantages and features of the present invention will become apparent from the subsequent description and the appended claims taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a vertical section view of a scroll compressor incorporating a non-orbiting scroll mounting arrangement in accordance with the present invention;

FIG. 2 is a section view of the compressor of FIG. 1, the section being taken along line 2--2 thereof;

FIG. 3 is an enlarged fragmentary section view of the mounting arrangement shown in FIG. 1;

FIGS. 4-6 are views similar to that of FIG. 3 but showing other embodiments of the present invention, all in accordance with the present invention;

FIG. 7 is a fragmentary section view of a portion of a scroll compressor showing another embodiment of a non-orbiting scroll mounting arrangement in accordance with the present invention;

FIG. 8 is a section view of the embodiment shown in FIG. 7, the section being taken along line 8--8 thereof;

FIG. 9 is a section view of a slider block assembly for use in preventing rotation of the non-orbiting scroll in the embodiment of FIGS. 7 and 8;

FIG. 10 is a perspective view of the slider block shown in FIG. 9;

FIG. 11 is a perspective view of an alternative slider block for use in the embodiment of FIG. 9;

FIG. 12 is a section view of an alternative rotation limiting assembly for use in the embodiment of FIG. 7;

FIG. 13 is a perspective view of another arrangement for mounting of a non-orbiting scroll member in accordance with the present invention, portions thereof being broken away;

FIG. 14 is an enlarged fragmentary view of a portion of the mounting arrangement shown in FIG. 13;

FIG. 15 is an enlarged fragmentary section view of a modified version of the mounting arrangement shown in FIGS. 13 and 14, all in accordance with the present invention;

FIG. 16 is a fragmentary somewhat diagrammatic horizontal sectional view illustrating a different technique for mounting the non-orbiting scroll for limited axial compliance;

FIG. 17 is a sectional view taken substantially along line 17--17 in FIG. 16;

FIG. 18 is a sectional view similar to FIG. 17 but showing a further technique for mounting the non-orbiting scroll for limited axial compliance;

FIGS. 19 and 20 are views similar to FIG. 17 illustrating two additional somewhat similar techniques for mounting the non-orbiting scroll for limited axial compliance;

FIG. 21 is similar to FIG. 16 and illustrates yet a further technique for mounting the non-orbiting scroll for limited axial compliance;

FIG. 22 is a sectional view taken substantially along line 22--22 in FIG. 21;

FIG. 23 is similar to FIG. 16 and illustrates yet another technique for mounting the non-orbiting scroll for limited axial compliance;

FIG. 24 is a sectional view taken substantially along line 24--24 in FIG. 23;

FIG. 25 is similar to FIG. 16 and illustrates yet a further technique for mounting the non-orbiting scroll for limited axial compliance;

FIG. 26 is a sectional view taken substantially along line 26--26 in FIG. 25;

FIG. 27 is a view similar to FIG. 21 illustrating diagrammatically yet another technique for mounting the non-orbiting scroll for limited axial compliance.

FIG. 28 is a view similar to that of FIG. 1 but illustrating another embodiment of the present invention;

FIG. 29 is an exploded perspective view of the scroll assembly incorporated in the embodiment of FIG. 1;

FIG. 30 is a plan view of the embodiment of FIG. 28, showing the securement for the anti-rotation strap;

FIG. 31 is a section view of the compressor of FIG. 28, the section being taken along line 31--31 thereof;

FIG. 32 is a vertical section view of the scroll compressor of FIG. 28 supported in a test stand prior to installation in the outer shell; and

FIG. 33 is a view similar to FIG. 28 but showing another alternative embodiment of the main bearing assembly in accordance with the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring now to the drawings and in particular to FIG. 1, a compressor 10 is shown which comprises a generally cylindrical hermetic shell 12 having welded at the upper end thereof a cap 14 and at the lower end thereof a base 16 having a plurality of mounting feet (not shown) integrally formed therewith. Cap 14 is provided with a refrigerant discharge fitting which may have the usual discharge valve therein (not shown). Other major elements affixed to the shell include a transversely extending partition 22 which is welded about its periphery at the same point that cap 14 is welded to shell 12, a stationary main bearing housing or body 24 which is suitably secured to shell 12 and a lower bearing housing 26 also having a plurality of radially outwardly extending legs each of which is also suitably secured to shell 12. A motor stator 28 which is generally square in cross section but with the corners rounded off is pressfitted into shell 12. The flats between the rounded corners on the stator provide passageways between the stator and shell, which facilitate the flow of lubricant from the top of the shell to the bottom.

A drive shaft or crankshaft 30 having an eccentric crank pin 32 at the upper end thereof is rotatably journaled in a bearing 34 in main bearing housing 24 and a second bearing 36 in lower bearing housing 26. Crankshaft 30 has at the lower end a relatively large diameter concentric bore 38 which communicates with a radially outwardly inclined smaller diameter bore 40 extending upwardly therefrom to the top of the crankshaft. Disposed within bore 38 is a stirrer 42. The lower portion of the interior shell 12 is filled with lubricating oil, and bore 38 acts as a pump to pump lubricating fluid up the crankshaft 30 and into passageway 40 and ultimately to all of the various portions of the compressor which require lubrication.

Crankshaft 30 is rotatively driven by an electric motor including stator 28, windings 44 passing therethrough and a rotor 46 pressfitted on the crankshaft 30 and having upper and lower counterweights 48 and 50 respectively. A counterweight shield 52 may be provided to reduce the work loss caused by counterweight 50 spinning in the oil in the sump. Counterweight shield 52 is more fully disclosed in assignee's U.S. Pat. No. 5,064,356 entitled "Counterweight Shield For Scroll Compressor", the disclosure of which is hereby incorporated by reference.

The upper surface of main bearing housing 24 is provided with a flat thrust bearing surface 53 on which is disposed an orbiting scroll 54 having the usual spiral vane or wrap 56 on the upper surface thereof. Projecting downwardly from the lower surface of orbiting scroll 54 is a cylindrical hub having a journal bearing 58 therein and in which is rotatively disposed a drive bushing 60 having an inner bore 62 in which crank pin 32 is drivingly disposed. Crank pin 32 has a flat on one surface which drivingly engages a flat surface (not shown) formed in a portion of bore 62 to provide a radially compliant driving arrangement, such as shown in assignee's aforementioned U.S. Pat. No. 4,877,382, the disclosure of which is herein incorporated by reference. An Oldham coupling 63 is also provided positioned between and keyed to orbiting scroll 54 and bearing housing 24 to prevent rotational movement of orbiting scroll member 54. Oldham coupling 63 is preferably of the type disclosed in the above referenced U.S. Pat. No. 4,877,382, however, the coupling disclosed in assignee's copending application Ser. No. 591,443 entitled "Oldham Coupling For Scroll Compressor" filed Oct. 1, 1990, the disclosure of which is hereby incorporated by reference, may be used in place thereof.

A non-orbiting scroll member 64 is also provided having a wrap 66 positioned in meshing engagement with wrap 56 of scroll 54. Non-orbiting scroll 64 has a centrally disposed discharge passage 75 communicating with an upwardly open recess 77 which is in fluid communication with a discharge muffler chamber 79 defined by cap 14 and partition 22. An annular recess 81 is also formed in non-orbiting scroll 64 within which is disposed a seal assembly 83. Recesses 77 and 81 and seal assembly 83 cooperate to define axial pressure biasing chambers which receive pressurized fluid being compressed by wraps 56 and 66 so as to exert an axial biasing force on non-orbiting scroll member 64 to thereby urge the tips of respective wraps 56, 66 into sealing engagement with the opposed end plate surfaces. Seal assembly 83 is preferably of the type described in greater detail in assignee's copending application Ser. No. 591,454 filed Oct. 1, 1990, now U.S. Pat. No. 5,156,539 and entitled "Scroll Machine With Floating Seal", the disclosure of which is hereby incorporated by reference. Scroll member 64 is designed to be mounted to bearing housing 24 and to this end has a plurality of radially outwardly projecting flange portions 68, 70, 72, 74 circumferentially spaced around the periphery thereof as shown in FIG. 2.

As best seen with reference to FIG. 3, flange portion 68 of non-orbiting scroll member 64 has an opening 76 provided therein within which is fitted an elongated cylindrical bushing 78, the lower end 80 of which is seated on bearing housing 24. A bolt 82 having a head 84 and washer 85 extends through an axially extending bore 86 provided in bushing 78 and into a threaded opening 88 provided in bearing housing 24. As shown, bore 86 of bushing 78 is of a diameter greater than the diameter of bolt 82 so as to accommodate some relative movement therebetween to enable final precise positioning of non-orbiting scroll member 64. Once scroll member 64 and hence bushing 78 have been precisely positioned, bolt 82 may be suitably torqued thereby securely and fixedly clamping bushing 78 between bearing housing 24 and washer 85. Washer 85 serves to insure uniform circumferential loading on bushing 78 as well as to provide a bearing surface for head 84 thereby avoiding any potential shifting of bushing 78 during the final torquing of bolt 82. It should be noted that as shown in FIG. 3, the axial length of bushing 78 will be sufficient to allow non-orbiting scroll 64 to slidably move axially along bushing 78 in a direction away from the orbiting scroll thereby affording an axially compliant mounting arrangement with the washer 85 and head 84 of bolt 82 acting as a positive stop limiting such movement. Substantially identical bushings, bolts and washers are provided for each of the other flange portions 70, 72, and 74. The amount of separating movement can be relatively small (e.g. on the order of 0.005" for a scroll 3" to 4" in diameter and 1" to 2" in wrap height) and hence the compressor will still operate to compress even though the separating force resulting therefrom may exceed the axial restoring force such as may occur on startup. Because the final radial and circumferential positioning of the non-orbiting scroll is accommodated by the clearances provided between bolts 82 and the associated bushings 78, threaded openings 88 in bearing housing 24 need not be as precisely located as would otherwise be required thus reducing the manufacturing costs associated therewith.

Alternatively, as shown in FIG. 4, the bolts 82 and bushings 78 may be replaced by a shoulder bolt 90 slidably fitted within openings 76' provided in the respective flange portions 68, 70, 72 and 74 of non-orbiting scroll 64. In this embodiment, the axial length "A" of the shoulder portion 92 of bolt 90 will be selected such that a slight clearance will be provided between the lower surface 91 of head portion of bolt 90 and the opposed surface of flange portion 68 when scroll member 64 is fully axially seated against scroll member 56 to thereby permit a slight axial separating movement in like manner as described above with reference to FIG. 3. Also, as noted above, surface 91 of bolt 90 will act as a positive stop to limit this axial separating movement of scroll member 64. The relative diameters of shoulder portion 92 and bore 76' will be such as to allow sliding movement therebetween but yet effectively resist radial and/or circumferential movement of scroll member 64. While this embodiment eliminates concern over potential shifting of the bushing relative to the securing bolt which could occur in the embodiment of FIG. 3, it is somewhat more costly in that the threaded holes in bearing housing 24 must be precisely located.

FIGS. 5 and 6 illustrate further alternative arrangements for mounting non-orbiting scroll member 64 to bearing housing 24. In FIG. 5, a bushing 94 is pressfitted within each of the openings 76" provided in respective flange portions 68, 70, 72 and 74. A shoulder bolt 96 is provided extending through bushing 94 and as described above with reference to FIG. 4 includes a shoulder portion 98 having an axial length "B" selected with respect to the length of bushing 94 to afford the desired axial movement of the non-orbiting scroll 64. In this embodiment, because bushing 94 is pressfitted within opening 76" it will slidably move along shoulder portion 98 of bolt 96 along with scroll member 64 to afford the desired axially compliant mounting arrangement. This embodiment allows for somewhat less precise locating of the threaded bores 88 in bearing housing 24 as compared to the embodiment of FIG. 4 in that the bushing 94 may be bored and/or reamed to provide the final precise positioning of the non-orbiting scroll member 64. Further, because the axial movement occurs between the bushing and shoulder bolt, concern as to possible wearing of the openings 76" provided in the flange portions of the fixed scroll is eliminated. As shown, bushing 94 has an axial length such that it is seated on bearing housing 24 when scroll member 64 is fully axially seated against scroll member 54 so as to provide a maximum surface area of engagement with shoulder portion 98, however, if desired, a shorter bushing 94 could be utilized in place thereof. Again, as in the above described embodiments, the head of bolt 96 will cooperate either with the end of bushing 94 or flange 68 as desired to provide a positive stop limiting the axial separating movement of scroll 64.

In the embodiment of FIG. 6, a counterbore 100 is provided in bearing housing 24 which counterbore serves as a pilot to receive an extended shoulder portion 102 of shoulder bolt 104. Again the axial length C of shoulder portion 102 will be selected so as to allow for the desired limited axial movement of non-orbiting scroll 64 and the head of bolt 104 will provide a positive stop therefor. Because the pilot counterbore can be reamed to establish the precise relative location of the non-orbiting scroll, the tolerance for locating the threaded bore may be increased somewhat. Further, this embodiment eliminates the need to provide and assemble separately fabricated bushings. Also, similarly to that described above, the relative diameters of shoulder portions 98 and 102 with respect to the bores through which they extend will be such as to accommodate axial sliding movement yet resist radial and circumferential movement.

A further embodiment of the present invention is illustrated in FIG. 7 wherein corresponding portions are indicated by the same reference numbers used in FIG. 1 primed. In this embodiment a separate annular retainer ring 106 is provided which surrounds non-orbiting scroll 64' and is securely bolted to bearing housing 24' by a plurality of fasteners 108.

Retainer ring 106 is generally L-shaped in cross section and includes an accurately machined inner peripheral surface 110 which is adapted to abut a corresponding accurately machined annular surface 112 provided on non-orbiting scroll 64' to thereby accurately radially position same as well as to guide axial movement thereof. Additionally, retainer ring 106 has an accurately machined radially inwardly facing surface portion 114 which is adapted to abut accurately machined radially outwardly facing shoulder portion 116 formed on bearing housing 24' so as to thereby accurately locate retainer ring 106 with respect thereto. This mounting arrangement also incorporates the axially compliant feature discussed above by providing a slight clearance between surface 117 of retainer ring 106 and an opposed surface 118 provided on scroll 64' both of which surfaces are accurately machined so as to provide a positive stop limiting this axial separating movement.

In order to prevent relative rotation of the non-orbiting scroll 64' with respect to retainer ring 106 and hence bearing housing 24', a slider block assembly 122 is provided on retainer ring 106. As best seen with reference to FIGS. 9-11, slider block assembly 122 comprises a block member 124 which is received within a suitably shaped radially extending slot 126 provided in a radially outwardly extending flange portion of the non-orbiting scroll member 64'. Block member 124 is generally T-shaped in cross section having a depending leg portion 130 received within a narrower portion 132 of slot 126 and oppositely extending arms 134, 136 loosely received within an upper portion 138 of slot 126 which arms serve to support block member 124 on scroll member 64'. A bolt 128 is threadedly secured within an opening 131 provided in retainer ring 106 and has a depending shaft portion 140 extending into a central opening 142 provided in block 124.

In operation, the close tolerance fit of both shaft portion 140 within bore 142 and the opposite circumferentially spaced sidewalls of leg portion 130 with the circumferentially opposed sidewalls of the lower portion 132 of slot 126 will cooperate to effectively prevent rotational movement of the non-orbiting scroll member. Further, because block 124 is free to move axially along shaft portion 140 of bolt 128, this anti-rotation assembly will not restrict the desired axial movement of the non-orbiting scroll member discussed above. Preferably, slide block 124 will be fabricated from metal.

An alternative slide block 144 is shown in FIG. 11. Slide block 144 is similar to slide block 124 with the exception that it includes a lower pair of circumferentially outwardly extending flange portions 146, 148 which may underlie the lower surface of the non-orbiting scroll 64' to thereby aid in retaining slide block 144 within slot 126.

Alternatively, in place of the slide block assembly described above, an anti-rotation clip assembly 150 may be utilized to prevent relative rotation of the non-orbiting scroll member. As shown in FIG. 12, clip assembly 150 includes a generally U-shaped first clip member 152 having a center portion secured to the undersurface of a flange portion of the non-orbiting scroll 64" by means of a suitable threaded fastener 154 and a pair of spaced substantially parallel depending leg members 155, 157. A second clip member 156 is secured to an upstanding post 158 integrally formed at a suitable location on main bearing housing 24" by means of a suitable threaded fastener. Second clip member 156 has a pair of spaced substantially parallel upwardly extending arm members 160, 162 and a raised center portion 164 seated on post 158 which together define a pair of spaced channels 166, 168 adapted to receive legs 155, 157 of first clip member 152. Clip members 152 and 156 will be aligned along a radius of the non-orbiting scroll member such that channels 166, 168 and legs 155, 157 will operate to prevent relative rotation between bearing housing 24" and non-orbiting scroll 64". Additionally, the slip fit connection between clip members 152 and 156 will accommodate the desired relative axial movement of non-orbiting scroll member 64" as noted above.

A further embodiment of an axially compliant non-orbiting scroll mounting arrangement is shown in FIGS. 13 and 14 wherein components corresponding to those shown in FIG. 1 are indicated by the same reference numbers triple primed. In this embodiment, an annular ring 170 is provided which is preferably formed from a suitable flexible sheet metal such as spring steel and is pressfitted on non-orbiting scroll member 64"'. An axially extending flange portion 172 extends around the inner periphery of ring 170 and abuts against an axially extending flange portion of non-orbiting scroll member 64"' so as to increase the engaging surface area therebetween. Ring 170 is in turn secured to bearing housing 24"' by means of a plurality of bolts 174 and sleeves 176. Preferably openings 178 in ring 170 through which bolts 174 extend will be somewhat larger in diameter than bolts 174 so as to reduce the need for precisely locating each of the taped holes in bearing housing 24"' which receive respective bolts 174.

A plurality of arcuate cutouts 180 are provided in ring 170 each being located just radially outwardly of flange 172, centered on respective bolts 174 and extending circumferentially in opposite directions therefrom. Cutouts 180 serve to increase the flexibility of ring 170 so as to accommodate the desired limited axial movement of non-orbiting scroll member 64"' as noted above. While it is believed that the pressfit engagement of ring 170 with scroll member 64"' will be sufficient to resist any relative rotational movement therebetween, additional securement means such as a pin or the like may be utilized to prevent same if desired.

An alternative embodiment of a retaining ring 184 is shown in FIG. 15. In this embodiment internally formed flange 172 is deleted and a separate retaining ring 182 is utilized to aid in securing ring 184 to non-orbiting scroll member 64"". Retaining ring 182 is generally L-shaped in cross section and sized to provide a secure pressfit engagement with non-orbiting scroll member 64"". The radially extending flange portion of retaining ring 182 may be secured to ring 184 in any suitable manner so as to insure against relative rotation therebetween. Retaining ring 182 will preferably be secured to the bearing housing by means of bolts 174' and sleeves 176' in a like manner as described above with respect to ring 170. Also, retaining ring 184 will include cutouts 180' similar to those provided on ring 170.

In FIGS. 16 through 20, there are illustrated a number of other suspension systems which have been discovered for mounting the non-orbiting scroll member for limited axial movement, while restraining same from a radial and circumferential movement. Each of these embodiments including those described above with reference to FIGS. 1 through 15, may function to mount the non-orbiting scroll member approximately at its mid-point, so as to balance the tipping moments on the scroll member created by radial fluid pressure forces.

With reference to FIGS. 16 and 17, support is maintained by means of a spring steel ring 186 anchored at its outer periphery by means of fasteners 188 to a mounting ring 190 affixed to the inside surface of shell 12, and at its inside periphery to the upper surface of flange 192 on non-orbiting scroll member 64 by means of fasteners 194. Ring 186 is provided with a plurality of angled openings 196 disposed about the full extent thereof to reduce the stiffness thereof and permit li