Gm Global Technolgoy Operations, Inc.

Mark J Bookbinder

Dwayne L Johnson

Christopher M Bellinger

Michael Eugene Daniels

Michael E Greene

Ronald E Marker

Susan Claire Vasko

Chrisotpher M Bellinger

Michael L Dees

Edward R La Marca

A scroll compressor for compressing a recirculated flow of a refrigerant fluid comprises a two-piece housing having a fixed scroll securely mounted therein. An orbital scroll is disposed in the housing and matingly operatively engages the fixed scroll. A rotatable drive shaft extends through the forward end of the housing and includes a radially offset, or eccentric, drive pin. A bushing is disposed on the drive pin and retained by a roller bearing centrally on the forward face of the orbital scroll. A counterweight is secured to the bushing. An axial limit pin extends integrally with the drive shaft and is fixed relative to the drive pin. The limit pin extends through an enlarged opening in the counterweight and abuts the forward face of the bushing. A C-type clip is seated in a groove on the distal end of the drive pin for axially retaining the bushing in place on the drive pin.

Axial positioning limit pin for scroll compressor

A scroll type compressor 10 having a housing 12, a non-orbital scroll 24, an orbital scroll 22, an orbital scroll drive 50, an anti-rotation assembly 54, and an axial thrust load assembly. The non-orbital scroll 24 is mounted in a rear casing of the housing 12. The orbital scroll 22 cooperates with the non-orbital scroll to form fluid pockets 46 and 48. The orbital scroll 22 is driven by an orbital drive 50 to move the fluid pockets to the center of the scrolls and compress the fluid sealed in the pockets. The anti-rotation assembly 54 includes cups 94 and pins 96 which define a circular orbit that is followed by bearings 104 on pins 100. The scroll drive 50 includes a drawn steel cup 70 that is driven by a drive shaft 82. A first bore 72, with an axis offset from the axis of the drive shaft 82, receives a knuckle bushing 62 which is rotatably attached to the orbital scroll 22. A balance weight 88 is journaled on the orbital scroll 22 and is driven by pin 86. The sliding connection between the cup 70 and the knuckle bushing permits some change in the orbit radius R.sub.o of the orbital scroll 22. The cups 94 are sized relative to the bearings 104 to accommodate changes in the orbit radius R.sub.o of the orbital scroll 22.

Scroll compressor orbital scroll drive and anti-rotation assembly

A scroll type compressor 10 having a housing 12, a non-orbital scroll 24 mounted in the rear casing of the housing 12 and an orbital scroll 22. The scrolls 22 and 24 cooperate to form fluid pockets 46 and 48. An orbital drive 50 orbits the orbital scroll 22 to move the fluid pockets 46 and 48 to the center of the scrolls and compress the fluid sealed in the pockets. An anti-rotation assembly 54 is connected to the housing 12 and to the orbital scroll 22 to prevent rotation and permit orbital movement of the orbital scroll. An axial thrust load assembly 56 including a baffle plate 114 with continuous pressure chamber flanges 120 and 122 are mounted in the rear section 16 of the housing 12. The flanges 120 and 122 are telescopically received in grooves 124 and 126 in the end plate 28 of the non-orbital scroll 24. V-shaped spring seals 130 are placed in the grooves 124 and 126. High pressure fluid in the inner discharge chamber and medium pressure which enters toroidal intermediate pressure chamber 138 through passage 140 exert an axial force on the scrolls. The non-orbital scroll 24 is mounted on fixed pins 134 which allow axial movement of the scroll. Springs 144 axially bias the non-orbital scroll 24 toward the orbital scroll 22.

Axial thrust applying structure for the scrolls of a scroll type

The scroll compressor 10 includes a housing 12. A fixed scroll 18, with an end plate 20, a spiral wrap 22 and a discharge aperture 90, is an integral part of the rear section 16 of the housing. An orbital scroll 24, including an end plate 26 and a spiral wrap 28, cooperates with the fixed scroll 18 to form sealed fluid pockets 38 and 40. An axial thrust and rotation prevention assembly 46 allows orbital motion, prevents rotation of the orbital scroll 24 and limits axial movement of the orbital scroll 24 away from the fixed scroll 18. The orbital scroll 24 is driven to move the fluid pockets 38 and 40 toward the center of the scrolls, and compress fluid in the pockets. The drive for the orbital scroll 24 includes a crankshaft 74 with a crank pin 78 journaled in the housing 12. An eccentric bushing 80 is journaled by a bearing 81 in a boss 82 on the orbital scroll 24. The crank pin 78 passes through a bore 87 in the eccentric bushing 80 to rotate the bushing. A lubrication passage 94 is provided through the crank pin 78 to allow fluid and entrained lubricant in the crankcase 100 to pass from the crankcase 100 to the cavity 96 and then through the bearing 81. A scoop 108 on the inlet end of the passage 94 will pick up lubricant from the crankcase.

Scroll compressor lubrication

The scroll compressor 10 includes a housing 12, a fixed scroll 18, an orbital scroll 24, an axial thrust and rotation prevention assembly 46, and an orbital scroll drive. The orbital scroll drive includes a crankshaft 74 rotatably journaled in the housing 12. The crankshaft includes an integral disk 76 and an eccentric crank pin 78 with a lubrication passage 96. An eccentric bushing 80 is journaled on the crank pin 78 and in a boss 82 on the orbital scroll by a needle bearing 81. An eccentric bushing retainer 102 has a shank portion 104 that is pressed into the lubrication passage 96 and an enlarged head portion 106 which holds the eccentric bushing 80 on the crank pin 78. If the eccentric bushing retainer 102 becomes partially unseated from the lubrication passage 96, the surface 114 on the enlarged head portion 106 will contact a surface 116 on the end plate 26 of the orbital scroll 24 and keep the eccentric bushing 80 properly positioned within the compressor housing 12. A passage 120 may be provided in the eccentric bushing retainer 102 to control lubrication of the eccentric bushing 80. The eccentric bushing retainer 102 can be made from plastics and other materials which will act as a bearing surface in the event contact is made with the surface 116 on the orbital scroll 24.

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Detroit, MI, United States of America

Mark J Bookbinder