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US 5,295,813 AGranted
Scroll-compressor having flat driving surfaces
AssigneeCopeland Corporation
InventorsJean-Luc Caillat, Roger C. Weatherston, James W. Bush
Life of this patent
Estimating the term…
Abstract
A scroll machine has a drive that incorporates radial compliance. The radial compliance is achieved by having the crank pin drive a drive bushing via a flat surface on the crank pin which slidably engages a flat bearing insert disposed in the wall of a bore located in the drive bushing. The bore in the drive bushing is slightly oval in cross-sectional shape to permit relative sliding movement between the crank pin and the drive bushing.
Claims21
A hermetic motor-compressor assembly comprising:
- (a) a hermetic shell having side and end walls;
- (b) first and second scroll members disposed in said shell, each of said scroll members having a spiral wrap disposed thereon, said scroll members facing one another with said wraps intermeshed with one another so that orbiting movement of said first scroll member with respect to said second scroll member will cause said wraps to create pockets of progressively decreasing volume towards the center of said scroll members;
- (c) an annular hub disposed on the axially opposite side of said first scroll member from said spiral wrap, said hub defining a central bore;
- (d) an annular drive bushing journaled in said bore, said drive bushing having a centrally disposed oval opening in which is defined a flat driven surface;
- (e) drive means comprising a crankshaft having an eccentric crank pin disposed in said oval opening, said crank pin having a flat drive surface thereon drivingly engaging said driven surface to cause said first scroll member to orbit, said driven and driving surfaces being flat so that they can slide relative to one another within said oval opening to accommodate limited radial unloading of said scroll members, said oval opening restricting movement of said scroll member to a direction generally parallel to said flat drive surface on said crank pin;
- and
- (f) a motor disposed in said shell and connected to said crankshaft to power same.
4 more elements
A hermetic motor-compressor assembly comprising:
- (a) a hermetic shell having side and end walls;
- (b) first and second scroll members disposed in said shell, each of said scroll members having a spiral wrap disposed thereon, said scroll members facing one another with said wraps intermeshed with one another so that orbiting movement of said first scroll member with respect to said second scroll member will cause said wraps to create pockets of progressively decreasing volume towards the center of said scroll members;
- (c) an annular hub disposed on the axially opposite side of said first scroll member from said spiral wrap, said hub defining a central bore;
- (d) an annular drive bushing journaled in said bore, said drive bushing having a centrally disposed opening in which is defined a flat driven surface;
- (e) drive means comprising a crankshaft having an eccentric crank pin disposed in said opening, said crank pin having a flat drive surface thereon drivingly engaging said driven surface to cause said first scroll member to orbit, said driven and driving surfaces being flat so that they can slide relative to one another to accommodate limited radial unloading of said scroll members;
- (f) a motor disposed in said shell and connected to said crankshaft to power same;
- (g) a source of lubricating oil in said shell;
- (h) means defining an oil feed passage in said crank shaft for delivering lubricating oil from said oil source to the end of said crank pin, from which it is thrown outwardly by centrifugal force upon rotation of said crankshaft;
- and
- (f) means defining a recess in the top of said bushing for collecting said thrown lubricating oil so that it can flow into said bore and opening for lubricating purposes.
7 more elements
A hermetic motor-compressor assembly comprising:
- (a) a hermetic shell;
- (b) a first and a second scroll member disposed in said shell, each of said scroll members having a spiral wrap disposed thereupon, said scroll members facing one another with said wraps intermeshed with one another so that orbiting movement of said first scroll with respect to said second scroll will cause said wraps to create pockets of progressively decreasing volume towards the center of said scroll members;
- (c) an annular hub disposed on the axially opposite side of said first scroll member from said spiral wrap, said hub defining a central bore;
- (d) an annular drive bushing journaled in said bore, said drive bushing having a centrally disposed oval opening in which is defined a flat driven surface;
- (e) drive means comprising a crankshaft having an eccentric crank pin disposed in said oval opening, said crank pin having a flat driving surface thereon drivingly engaging said flat driven surface to cause said first scroll to orbit said driven and drive surfaces being flat so that they can slide relative to one another within said oval opening to accommodate limited radial unloading of said scroll members;
- (f) a motor disposed in said shell and connected to said crankshaft to power same;
- (g) a source of lubricating oil in said shell;
- (h) means for delivering lubricating oil from said oil source to the end of said crank pin from which it is thrown outwardly by centrifugal force upon rotation of said crankshaft;
- (i) means at the top of said bushing for distributing said thrown lubricating oil into said bore or said opening for lubricating purposes;
- and
- (j) a fixed portion of said compressor assembly having a chamber, said annular hub being disposed within said chamber, said chamber defining a drain hole for returning said thrown lubricating oil to said source of lubricating oil in said shell.
8 more elements
A hermetic motor-compressor assembly comprising:
- (a) a hermetic shell having side and end walls;
- (b) first and second scroll members disposed in said shell, each of said scroll members having a spiral wrap disposed thereon, said scroll members facing one another with said wraps intermeshed with one another so that orbiting movement of said first scroll member with respect to said second scroll member will cause said wraps to create pockets of progressively decreasing volume towards the center of said scroll members;
- (c) an annular hub disposed on the axially opposite side of said first scroll member from said spiral wrap, said hub defining a central bore;
- (d) an annular drive bushing journaled in said bore, said drive bushing having a centrally disposed oval opening in which is defined a flat driven surface;
- (e) drive means comprising a crankshaft having an eccentric crank pin disposed in said oval opening, said crank pin having a flat drive surface, a majority of the surface area of said flat drive surface drivingly engaging said flat driven surface to cause said first scroll member to orbit, said driven and driving surfaces being able to slide relative to one another within said oval opening to accommodate limited radial unloading of said scroll members;
- and
- (f) a motor disposed in said shell and connected to said crankshaft to power same.
4 more elements
Dependencies are inferred from the claim text.