US 7,604,465 B2Granted

Fluid machine and scroll compressor having a crankshaft with a large diameter shaft section

AssigneeMitsubishi Heavy Industries, Ltd.

InventorsKatsuhiro Fujita, Tomohisa Moro, Takayuki Kuwahara, Kazuhide Watanabe, Tetsuzou Ukai, Norio Hioki, Hiroshi Yamazaki, Makoto Takeuchi, Takamitsu Himeno

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Abstract

There is provided a fluid machine able to secure a sectional area of a passage sufficient for gaseous fluid flow from a suction port to a compression mechanism, while able at the same time to achieve a reduction in size of the outline shape. In a scroll compressor where a scroll compression mechanism is housed within a housing having a funnel shaped, a compression mechanism main body of the scroll compression mechanism is arranged in a wide opening section of a front housing, and a compression mechanism driving section is arranged in a narrow section, a concave section is formed on the outside of a thrust receiving surface which is positioned on a bottom surface of the wide opening section and which supports the compression mechanism.

Claims7

Dependent claims

A scroll compressor, comprising:

a housing;
a compression mechanism, said compression mechanism having a stationary scroll fixed and supported in said housing, and an orbiting scroll that is intermeshed with said stationary scroll to form a plurality of compression chambers between the stationary scroll and the orbiting scroll and that revolves;
and further comprising:
a crankshaft having a first end side provided with a large diameter shaft section, the large diameter shaft section connecting with an eccentric member for orbiting said orbiting scroll member and being freely rotatably supported on said housing via needle shaped roller bearings having an outer ring, the large diameter shaft section and the outer ring both having an outside facing end portion directed away from the eccentric member and an inside facing end portion directed toward the eccentric member;
a seal member arranged on a portion of said crankshaft extending from the outside facing portion of the large diameter shaft section, the seal member sealing off an interior of said housing from outside;
and
a crank chamber into which fluid containing lubrication oil is sucked, provided between said orbiting scroll member and said large diameter shaft section, wherein
the large diameter shaft section has an outer circumferential surface extending in a plane along a direction parallel to a direction of extension of a central axis of the large diameter shaft section extending between the inside facing portion of the large diameter shaft section and the outside facing portion of the large diameter shaft section, the outer circumferential surface having an outside end nearer to the outside facing end portions of the large diameter shaft section and the outer ring than the inside facing end portions thereof and an inside end nearer to the inside facing end portions of the large diameter shaft section and the outer ring than the outside facing end portions thereof, with at least one of the outside end and inside end of the circumferential surface of said large diameter shaft section being spaced from a corresponding outside facing end portion or inside facing end portion of the large diameter shaft section a and spaced from a corresponding outside facing end portion or inside facing end portion of the outer ring.

5 more elements

A scroll compressor, comprising:

a housing;
a compression mechanism, said compression mechanism having a stationary scroll fixed and supported in said housing, and an orbiting scroll that is intermeshed with said stationary scroll to form a plurality of compression chambers between the stationary scroll and the orbiting scroll, and that revolves;
a crankshaft with a large diameter shaft section having an eccentric member for orbiting said orbiting scroll on one end section, said large diameter shaft section being freely rotatably supported on said housing via needle shaped roller bearings having an outer ring;
a seal member arranged on an other end side of said crankshaft for sealing off the interior of said housing from outside;
and
a crank chamber into which fluid containing lubrication oil is sucked, provided between said orbiting scroll member and said large diameter shaft section, wherein
a dimension of a circumferential surface of said large diameter shaft section in a direction parallel to an axial direction of the large diameter shaft is made shorter than a dimension of the outer ring of said needle shaped roller bearing in said direction parallel to the axial direction of the large diameter shaft.

4 more elements

A scroll compressor, comprising:

a housing;
a compression mechanism, said compression mechanism having a stationary scroll fixed and supported in said housing, and an orbiting scroll that is intermeshed with said stationary scroll to form a plurality of compression chambers between the stationary scroll and the orbiting scroll and that revolves;
and further comprising:
a crankshaft having a first end side provided with a large diameter shaft section, the large diameter shaft section connecting with an eccentric member for orbiting said orbiting scroll member and being freely rotatably supported on said housing via needle shaped roller bearings having an outer ring, the large diameter shaft section and the outer ring both having an outside facing end portion directed away from the eccentric member and an inside facing end portion directed toward the eccentric member;
a seal member arranged on a portion of said crankshaft extending from the outside facing portion of the large diameter shaft section, the seal member sealing off an interior of said housing from outside;
and
a crank chamber into which fluid containing lubrication oil is sucked, provided between said orbiting scroll member and said large diameter shaft section, wherein
the large diameter shaft section has an outer circumferential surface extending in a plane along a direction parallel to a direction of extension of a central axis of the large diameter shaft section extending between the inside facing portion of the large diameter shaft section and the outside facing portion of the large diameter shaft section, the outer circumferential surface having an outside end nearer to the outside facing end portions of the large diameter shaft section and the outer ring than the inside facing end portions thereof and an inside end nearer to the inside facing end portions of the large diameter shaft section and the outer ring than the outside facing end portions thereof, with at least one of the outside end and inside end of the circumferential surface of said large diameter shaft section being farther from a corresponding outside facing end portion or inside facing end portion of the large diameter shaft section as compared to a corresponding outside facing end portion or inside facing end portion of the outer ring, and wherein
at least one of a part of the outside facing end portion and inside facing end portion of the large diameter shaft section is cutaway to define at least one of the inside end and outside end of the outer circumferential surface of said large diameter shaft section.

6 more elements

A scroll compressor, comprising:

a housing;
a compression mechanism, said compression mechanism having a stationary scroll fixed and supported in said housing, and an orbiting scroll that is intermeshed with said stationary scroll to form a plurality of compression chambers between the stationary scroll and the orbiting scroll and that revolves;
and further comprising:
a crankshaft having a first end side provided with a large diameter shaft section, the large diameter shaft section connecting with an eccentric member for orbiting said orbiting scroll member and being freely rotatably supported on said housing via needle shaped roller bearings having an outer ring, the large diameter shaft section and the outer ring both having an outside facing end portion directed away from the eccentric member and an inside facing end portion directed toward the eccentric member;
a seal member arranged on a portion of said crankshaft extending from the outside facing portion of the large diameter shaft section, the seal member sealing off an interior of said housing from outside;
and
a crank chamber into which fluid containing lubrication oil is sucked, provided between said orbiting scroll member and said large diameter shaft section, wherein
the large diameter shaft section has an outer circumferential surface extending in a plane along a direction parallel to a direction of extension of a central axis of the large diameter shaft section extending between the inside facing portion of the large diameter shaft section and the outside facing portion of the large diameter shaft section, the outer circumferential surface having an outside end nearer to the outside facing end portions of the large diameter shaft section and the outer ring than the inside facing end portions thereof and an inside end nearer to the inside facing end portions of the large diameter shaft section and the outer ring than the outside facing end portions thereof, with at least one of the outside end and inside end of the circumferential surface of said large diameter shaft section being farther from a corresponding outside facing end portion or inside facing end portion of the large diameter shaft section as compared to a corresponding outside facing end portion or inside facing end portion of the outer ring, and wherein
parts of the outside facing end portion and inside facing end portion of the large diameter shaft section are cutaway to define a corresponding inside end and outside end of the outer circumferential surface of said large diameter shaft section.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/700,874Filed 1 Feb 2007
Priority: JP 2006-16467714 Jun 2006
Published: US 2007/0292293 A120 Dec 2007
Granted: 20 Oct 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

F04C 18/0215
Both members having co-operating elements in spiral form: where only one member is moving
F01C 21/02
Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00: arrangements of bearings
F01C 21/10
Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00: outer members for co-operation with rotary pistons; Casings
F04C 29/0057
Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions: for eccentric movement