Information
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Patent Grant
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6428294
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Patent Number
6,428,294
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Date Filed
Tuesday, February 13, 200123 years ago
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Date Issued
Tuesday, August 6, 200222 years ago
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Inventors
-
Original Assignees
-
Examiners
Agents
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CPC
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US Classifications
Field of Search
US
- 418 555
- 418 556
- 418 57
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International Classifications
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Abstract
An improved slider block for a scroll compressor has a bore including two spaced circular portions centered on a common axis. A recess is formed into one of the curved portions to provide additional clearance for movement of an eccentric pin. The recess allows the eccentric pin to move within the bore, as the relative position of the slider block and the eccentric pin move and change during operation of the scroll compressor.
Description
BACKGROUND OF THE INVENTION
This invention relates to a slider block for a scroll compressor wherein the inner bore of the slider block has a clearance recess to allow for movement of the eccentric pin that moves relative to the slider block bore.
Scroll compressors are becoming widely utilized in refrigerant compression applications. In a scroll compressor a first scroll member has a generally spiral wrap extending from a base. A second scroll member has its own wrap which interfits with the spiral wrap of the first scroll member. The second scroll member is caused to orbit relative to the first scroll member to entrap and then compress a refrigerant. The second scroll member is generally driven to orbit by an electric rotary motor driving the second scroll member through a Oldham coupling. The connection between the driveshaft of the motor and the orbiting scroll is through a slider block, such that the second scroll has the ability to move relative to the first scroll under certain circumstances. Typically, the shaft has an eccentric pin extending upwardly into an opening in the slider block. The opening has a flat drive surface that is in contact with a barrel shaped drive surface on the eccentric pin. The bore of the slider block has two opposed curved surfaces. The pin may slide relative to the flat surface on the slider block, such that the orbiting scroll can move towards and away from the wrap on the first scroll member.
In one type of slider block, the accurate surfaces that define the two curved portions of the bore need to be spaced relatively far inwardly to provide for additional structure on the outer periphery of the slider block. In particular, one type of slider block has an oil notch at its side. The formation of the oil notch requires that the curved surface be spaced relatively far inwardly to provide for sufficient wall thickness. However, if the wall is sufficiently thick such that the curved surface is spaced inwardly, it may well be there is insufficient clearance for the pin to move to certain positions with out contacting the opposed curved surface.
The present invention is directed to addressing the above-mentioned problem.
SUMMARY OF THE INVENTION
A scroll compressor is provided with a slider block having a pair of curved opposed surfaces. The surfaces are preferably centered on a common center line. A pair of drive flats separates the two curved surfaces. A recess is formed into one of the two curved surfaces to provide additional clearance for movement of the eccentric pin. Preferably the recess is generally opposed to structure on the outer periphery of the slider block; the structure is preferably a notch to allow for flow of oil. The notch is associated with one of the two curved surfaces, and the curved surface is spaced inwardly from the notch to provide sufficient wall thickness. The inwardly spaced curved surface results in the need for additional clearance provided by the recess.
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.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a cross-sectional view through a scroll compressor.
FIG. 2
is a cross-sectional view through the inventive slider block.
FIG. 3
shows a portion of the
FIG. 2
slider block.
FIG. 4
is a cross-sectional view showing the inventive slider block and the eccentric drive pin.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
FIG. 1
illustrates a scroll compressor
20
having a non-orbiting scroll
22
and an orbiting scroll
24
. As known, a driveshaft
26
is driven to rotate, and has an eccentric pin
30
extending upwardly into a bore
28
in the orbiting scroll
24
. A slider block
32
is positioned between the pin
30
and the bore
28
.
As shown in
FIG. 2
, the slider block
32
has an inner peripheral bore defining a first curved surface
34
with two circumferentially spaced portions, and an opposed second curved surface
36
. Intermediate the two curved portions
34
is a curved recess
42
. Curved surfaces
34
,
36
and
42
are all centered on a common point
40
. Thus, surfaces
34
and
36
are essentially portions of the same circle, whereas portion
42
is a circle with the same center, but a slightly larger radius. As shown, a notch
38
is formed on the outer periphery of the slider block
32
. The notch
38
allows for oil flow between the slider block and the bearing generally positioned outwardly of the slider block which is visible in FIG.
1
.
FIG. 3
is an enlarged view of the recess
42
. As can be seen, end ledges
44
of the recess
42
merge into the curved portions
34
.
FIG. 4
shows the eccentric pin
30
received within the bore. The eccentric pin is shown in the position where it is spaced as far to the left in this figure as it will typically be. As can be seen, a portion of the outer periphery of the eccentric pin
30
would now extend into the recess
42
. If the recess
42
were not there, there could be contact, which would be undesirable. Further, as is shown in
FIG. 4
, the flat
50
within the bore of the slider block is in driving engagement with a barrel surface
52
from the drive pin
30
.
A preferred embodiment of this invention has been disclosed. However, a worker 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
- 1. A scroll compressor comprising:a first scroll member having a generally spiral wrap extending from a base and a second scroll member having a generally spiral wrap extending from its base; a driveshaft for driving said second scroll member to orbit relative to said first scroll member, said second scroll member having a downwardly extending boss, said driveshaft having an eccentric pin extending upwardly into said boss; and a slider block received between said eccentric pin and said boss of said second scroll member, said slider block having an inner bore receiving said eccentric pin, with said slider block and said eccentric pin having surfaces in engagement for transmitting movement, said bore of said slider block including a pair of circumferentially spaced first and second curved portions, and a recess extending into said first curved portion such that said recess is spaced further from a center of curvature of said first curved portion then said first of said curved portions wherein said first and second curved portions are circular arcs entered on the same axis.
- 2. A scroll compressor as recited in claim 1, wherein said recess is also a circular portion centered on said axis of said first and second curved portions.
- 3. A scroll compressor as recited in claim 1, wherein an oil notch is formed at an outer periphery of said slider block at a position associated with the other of said curved portions.
- 4. A scroll compressor comprising:a first scroll member having a generally spiral wrap extending from a base and a second scroll member having a generally spiral wrap extending from its base; a driveshaft for driving said second scroll member to orbit relative to said first scroll member, said second scroll member having a downwardly extending boss, said driveshaft having an eccentric pin extending upwardly into said boss; a slider block received between said eccentric pin and said box, said slider block having an inner bore receiving said eccentric pin, with said slider block and said eccentric pin having surfaces in engagement for transmitting movement, said eccentric pin moving relative to said slider block such that said surfaces come into engagement along a first direction, said bore of said slider block including a pair of circumferentially spaced first and second curved portions, with said curved portions being spaced upon opposed sides of said direction of relative movement of said slider block and said eccentric pin, and such that said curved portions are spaced on opposed sides of said engagement surfaces and a recess extending into one of said curved portions such that said recess is spaced further from a center of curvature of said one of said curved portions then said one of said curved portions, said first and second curved portions being circular arcs centered on an common axis with said recess also being a circular portion centered on said axis of said first and second curved portions; and an oil notch formed at an outer periphery of said slider block at a position associated with the other of said curved portions.
- 5. A scroll compressor comprising:a first scroll member having a generally spiral wrap extending from a base and a second scroll member having a generally spiral wrap extending from its base; a driveshaft for driving said second scroll member to orbit relative to said first scroll member, said second scroll member having a downwardly extending boss, said driveshaft having an eccentric pin extending upwardly into said boss; and a slider block received between said eccentric pin and said boss of said second scroll member, said slider block having an inner bore receiving said eccentric pin, with said slider block and said eccentric pin having surfaces in engagement for transmitting movement, said eccentric pin moving relative to said slider block such that said surfaces come into engagement along a first direction, said bore of said slider block including a pair of circumferentially spaced first and second curved portions, with said curved portions being spaced upon opposed sides of said direction of relative movement of said slider block and said eccentric pin, and such that said curved portions are spaced on opposed sides of said engagement surfaces said curved portions being circular arcs centered on a common axis, with a pair of generally flat portions which are positioned circumferentially intermediate spaced circumferential ends of said first and second curved portions.
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Number |
Name |
Date |
Kind |
4609334 |
Muir et al. |
Sep 1986 |
A |
5295813 |
Caillat et al. |
Mar 1994 |
A |
5496158 |
Barito et al. |
Mar 1996 |
A |
5520524 |
Takemoto et al. |
May 1996 |
A |
5582513 |
Shigeoka et al. |
Dec 1996 |
A |
Foreign Referenced Citations (2)
Number |
Date |
Country |
2509536 |
Sep 1976 |
DE |
4-191489 |
Jul 1992 |
JP |