JP2011137398A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve manufacturability while certainly preventing rotation of a snap ring in a scroll compressor. <P>SOLUTION: A bush 66 composing the scroll compressor is formed with a projection 68 on an axis at the end surface 66a of the bush 66, and also formed with a hole decentered in a radially outward direction with respect to the projection 68. An eccentric pin 58 of a rotating shaft 48 is inserted into the hole. A slip-out preventive ring 74 having a C-shaped cross section is mounted to the end of the eccentric pin 58 through an annular groove 72, and the opening 76 of the slip-out preventive ring 74 is engaged with the projection 68. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a scroll compressor, and more particularly to a scroll compressor that compresses a fluid inside a compressor by turning a movable scroll relative to a fixed scroll.

  The applicant of the present invention has a fixed plate, a fixed scroll having a spiral fixed side wrap that stands upright on the fixed plate, a movable plate, and the movable plate upright on the movable plate. A scroll compressor having a movable scroll arranged so that a spiral movable wrap meshes with a fixed wrap is proposed.

  In this scroll compressor, a bush is provided on a pin that is eccentric with respect to the rotating shaft, a retaining ring is attached to the pin, the bush is fixed to the bush, and the movable scroll is turned through the pin and the bush. Thus, the fluid is compressed by gradually moving the compression chamber formed between the fixed scroll and the movable scroll wrap and the fixed plate and the movable plate from the outer peripheral portion to the central portion (Patent Literature). 1).

  When fixing the pin as described above with a retaining ring, for example, as disclosed in Patent Document 2, an annular groove is provided at the upper end portion of the pin, and the cross-section is C-shaped with respect to the annular groove. The retaining ring is engaged, and a boss is protruded from another member such as a bush through which the pin is inserted to be disposed at an opening portion of the retaining ring, thereby restricting the rotation of the retaining ring. Thus, even when the pin is displaced relative to the other member such as the bush in the axial direction, the pin is locked by the retaining ring.

JP 2004-301065 A Japanese Utility Model Publication No. 51-139879

  However, when the boss is provided on the surface of the other member through which the pin is inserted to prevent the retaining ring from rotating, the boss is inevitably offset from the center because the pin is provided at the center of the other member. Will be provided. As a result, when manufacturing the other member, a separate process for forming the boss is required, which increases the manufacturing process, and there is a problem that processing is complicated because it is not provided at the center. .

  The present invention has been made in consideration of the above-described problems, and an object of the present invention is to provide a scroll compressor capable of improving productivity while reliably preventing rotation of a retaining ring. .

In order to achieve the above object, the present invention provides a fixed scroll having a fixed spiral wall, a movable scroll having a movable spiral wall, a support to which a rotational force from a rotational drive source is transmitted, and the support. An eccentric pin provided eccentrically on the body axis, a bush having a hole into which the eccentric pin is inserted and fitted into the movable scroll, and an end of the eccentric pin inserted through the bush A scroll compressor including a retaining ring,
The bush is formed on an end surface that is an end portion side of the eccentric pin, and includes a protrusion that engages with an opening of the retaining ring and performs a detent function,
The protrusion is characterized in that at least a part of a cross-sectional shape along the axial direction of the bush is formed in a concentric arc shape having a center on the axial line of the bush.

  According to the present invention, in the bush constituting the scroll compressor, when the protrusion having the center on the axis is provided and the retaining ring is attached to the end of the eccentric pin inserted through the hole of the bush The opening is engaged with the protrusion. Thereby, since the retaining ring is locked with respect to the end surface of the bush, the displacement along the axial direction of the eccentric pin is restricted, and the opening is engaged with the protrusion. The rotational displacement of the retaining ring is also restricted at the same time.

  Therefore, by providing a projection that serves as a detent for the retaining ring at the center on the axis of the bush and having a cross-sectional shape that is at least concentric arcs, the projection is formed simultaneously when the bush is processed. be able to. As a result, it is possible to shorten the machining time and the machining process as compared with the conventional technique in which the protruding portion is formed eccentric to the center of the bush. In the scroll compressor including the bush, Manufacturability can be improved.

  The value obtained by adding the radius of the hole and the radius of the protrusion may be set to be larger than the separation distance between the center of the hole and the center of the protrusion. As described above, by providing the protrusion and the hole so as to overlap, the protrusion and the hole can be arranged close to each other, and accordingly, the hole and the protrusion are included. The outer diameter of the bush can be reduced, the size of the scroll compressor including the bush can be reduced, and when the radius of the hole is set large, the strength of the eccentric pin inserted can be increased. On the other hand, when the radius of the protruding portion is set large, the amount of processing of the protruding portion can be suppressed, so that the processing time can be shortened.

  Furthermore, by setting the radius of the hole larger than the distance between the center of the hole and the center of the protrusion, the hole can be disposed closer to the protrusion, The outer diameter of the bush including the hole and the protrusion can be set to be smaller, and the scroll compressor including the bush can be further reduced in size.

  Furthermore, the cross-sectional shape of the protrusion is formed by combining another arc having a center eccentric in the radial direction with respect to the center of the bush. The part can be easily formed.

  According to the present invention, the following effects can be obtained.

  That is, in the bush that constitutes the scroll compressor, a protrusion having a center on its axis is provided, and when the retaining ring is attached to the end of the eccentric pin inserted into the hole of the bush, the opening Since the protrusion is provided at the center on the axis of the bush, and the cross-sectional shape is at least a concentric arc, the protrusion is simultaneously formed. Can be formed. Therefore, compared with the prior art in which the protrusion is formed eccentrically with respect to the center of the bush, the processing time can be shortened and the processing steps can be reduced, and the manufacture of the scroll compressor including the bush It is possible to improve the performance.

It is a schematic longitudinal cross-sectional explanatory drawing of the scroll compressor which concerns on the 1st Embodiment of this invention. FIG. 2 is a schematic exploded perspective view of the scroll compressor shown in FIG. 1. It is a principal part expanded sectional view of the scroll compressor shown in FIG. It is an external appearance perspective view which shows the bush of FIG. 3, a balance weight, and a rotating shaft. It is a top view of the bush of FIG. 4, a balance weight, and a rotating shaft. FIG. 6 is an explanatory plan view showing a relationship between a pin hole through which an eccentric pin is inserted and a protrusion in the bush of FIG. 5. It is a plane explanatory view showing the bush concerning the 1st modification. It is a plane explanatory view showing the bush concerning the 2nd modification. It is a plane explanatory view showing a bush concerning the 3rd modification. 10A to 10D are plan views showing a retaining ring according to first to fourth modifications.

  A preferred embodiment of a scroll compressor according to the present invention will be described in detail below with reference to the accompanying drawings.

  In FIG. 1, reference numeral 10 indicates a scroll compressor according to an embodiment of the present invention.

  As shown in FIGS. 1 and 2, the scroll compressor 10 includes a front housing 12 formed in a cup shape and a rear housing 14 formed in a crown shape.

  In the upper part of the front housing 12, for example, a suction port 12a for introducing a gas such as a refrigerant gas into the inside is formed. On the other hand, an upper part of the rear housing 14 is formed with a discharge port 14a that discharges the compressed gas compressed by the scroll compressor 10 to, for example, a refrigerant circulation system. The front housing 12 is provided with a plurality of mounting seats 18 for mounting the scroll compressor 10 to, for example, an engine or an external device.

  On the other hand, a fixed scroll 20 and a movable scroll 22 that turns with respect to the fixed scroll 20 are disposed inside the front housing 12. The fixed scroll 20 includes a fixed-side substrate portion 24 including an outer peripheral edge sandwiched between the front housing 12 and the rear housing 14, and a fixed scroll erected from the fixed-side substrate portion 24 toward the movable scroll 22. And a side spiral wall 26.

  The movable scroll 22 has a movable side substrate portion 28 and a movable side spiral wall 30 which is erected in a spiral shape from the movable side substrate portion 28 to the fixed scroll 20 side and meshes with the fixed side spiral wall 26.

  A gas compression chamber 32 is formed by the fixed-side substrate portion 24 and the fixed-side spiral wall 26 constituting the fixed scroll 20, and the movable-side substrate portion 28 and the movable-side spiral wall 30 constituting the movable scroll 22. In order to seal the gas compression chamber 32, a seal member 34 is slidably in contact with the movable side substrate portion 28 and the fixed side substrate portion 24 at each end of the fixed side spiral wall 26 and the movable side spiral wall 30. Is installed.

  The rear housing 14 is mounted on the back surface of the fixed scroll 20 via a gasket 36 formed in an annular and thin plate shape, thereby forming a gas discharge chamber 38 communicating with the discharge port 14a. A compressed gas outlet hole 40 that communicates from the gas compression chamber 32 to the gas discharge chamber 38 is formed at a substantially central portion of the fixed-side substrate portion 24 of the fixed scroll 20.

  The rear housing 14, the fixed scroll 20, and the gasket 36 are fastened to the front housing 12 by a plurality of (for example, four) bolts 42.

  In addition, the back side of the fixed scroll 20 closes the compressed gas outlet hole 40, and when the compressed gas compressed in the gas compression chamber 32 reaches a predetermined pressure, it bends and opens to open the gas discharge chamber. A discharge valve 44 for leading the compressed gas to 38 is provided.

  A shaft portion 50, which is one end of the rotating shaft 48, is inserted into the opening 46 at the end of the front housing 12 whose diameter has been reduced. The shaft portion 50 is rotatably supported by the opening 46 through the first bearing 52. On the other hand, the other end of the rotating shaft 48 is provided with a support 54 that expands in diameter. The support 54 is rotatably supported when its supported surface is fitted (press-fitted) into the support surface 82 of the second bearing 56. The second bearing 56 is supported inside the front housing 12.

  The support 54 is provided with an eccentric pin 58 that is eccentric with respect to its axis. A sealing member 60 for sealing the gas suction chamber 59 is fitted into the shaft portion 50 of the rotating shaft 48.

  The movable side substrate 28 of the movable scroll 22 is formed with a circular recess 62 opened on the front side. A bush 66 is rotatably inserted into the circular recess 62 via a swivel bearing 64.

  As shown in FIGS. 3 to 5, the bush 66 is formed in a columnar shape, and protrudes toward the end surface facing the movable side substrate portion 28. The bush 66 is eccentric with respect to the protrusion 68 and is axial ( And a hole portion 70 penetrating along the direction of arrows A and B).

  The protrusion 68 is formed in a substantially circular cross section on the axis of the bush 66 and is formed so as to protrude from the end surface 66a of the bush 66 by a predetermined height.

  The hole 70 is formed so that an eccentric pin 58 provided on the rotary shaft 48 can be inserted therethrough, and is formed so as to be spaced apart from the protrusion 68 by a predetermined distance in the radially outward direction. That is, the diameter of the hole 70 is set to be approximately the same as or slightly larger than the diameter of the eccentric pin 58.

  Further, as shown in FIG. 6, the hole 70 has a distance L1 obtained by adding the radius R1 and the radius R2 of the protrusion 68 between the center C1 of the hole 70 and the center C2 of the protrusion 68. Is set to be larger than the separation distance L2 (R1 + R2 = L1> L2).

  That is, the hole 70 is disposed so as to overlap with a part of the protrusion 68, and a part of the protrusion 68 is notched by the hole 70 as shown in FIG. 6. .

  The eccentric pin 58 inserted through the hole portion 70 is formed to be longer than the length along the axial direction (arrow A, B direction) of the hole portion 70, and the tip portion thereof is predetermined from the end surface 66 a of the bush 66. It protrudes by the height (see FIGS. 3 and 4).

  An annular groove 72 is formed at the tip of the eccentric pin 58 along the outer peripheral surface, and a retaining ring (retaining ring) 74 having a C-shaped cross section is fitted into the annular groove 72. The retaining ring 74 is formed of, for example, a plate material having a constant thickness by press molding or the like, has an opening 76 cut out by a predetermined range along the circumferential direction, and protrudes radially inward from the inner circumferential surface thereof. A plurality of convex portions 78 are provided.

  Then, the retaining ring 74 is moved from the outer peripheral side of the eccentric pin 58 in the direction orthogonal to the axis of the eccentric pin 58 through the opening 76, and the plurality of convex portions 78 are engaged with the annular groove 72. As a result, the retaining ring 74 is engaged and fixed integrally with the engaging groove, and the eccentric pin 58 is prevented from moving in the axial direction (arrow A, B direction) relative to the bush 66 by the retaining ring 74. Is done. A balance weight 80 is mounted on the bush 66 so as to face the eccentric pin 58.

  Further, the retaining ring 74 is mounted such that when the eccentric pin 58 is mounted, the protrusion 68 is disposed inside the opening 76. As a result, the movement of the retaining ring 74 in the rotational direction is also restricted.

  As shown in FIGS. 1 and 2, the movable scroll 22 is slidably supported between the movable side substrate portion 28 of the movable scroll 22 and a support surface 82 formed inside the front housing 12. An Oldham ring 86 that is a rotation restraining member that constrains the rotation of the movable scroll 22 while the thrust plate 84 and the movable scroll 22 are rotated, and an Oldham ring 86 that is orthogonal to the axial direction of the rotary shaft 48. And an Oldham base 88 that receives the axial thrust force applied to the movable scroll 22 via a thrust plate 84 is disposed.

  The Oldham base 88 is fixed to the support surface 82 by a plurality of (for example, two) bolts 92 with a shim 90 interposed therebetween.

  On the other hand, a pulley 96 is attached to the outer peripheral portion of the opening 46 of the front housing 12 via a third bearing 94. A rotational force is transmitted to the pulley 96 from a rotational drive source such as an engine (not shown), and the rotational force is transmitted to or disconnected from the rotational shaft 48 by the on / off operation of the electromagnetic clutch 98.

  The scroll compressor 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation, action, and effect thereof will be described.

  First, when a rotational force is transmitted to the rotary shaft 48 under the operation action of the electromagnetic clutch 98, the support 54 rotates through the second bearing 56, whereby the eccentric pin 58 fixed to the support 54 is moved. It turns in an eccentric state with respect to the axis of the rotating shaft 48. As a result, the bush 66 rotates, under the sliding action of the Oldham ring 86 slidably supported by the Oldham base 88, under the rotation restraining action by the Oldham ring 86, and further by the sliding contact surface of the thrust plate 84. Under the sliding support action, the movable scroll 22 turns with respect to the fixed scroll 20 while being restricted from rotating. At this time, the balance weight 80 is turning by generating a centrifugal force that balances the centrifugal force generated by the turning of the movable scroll 22.

  As a result, the gas compression chamber 32 formed between the fixed scroll 20 and the movable scroll 22 gradually proceeds from the outer peripheral portion to the central portion, and is introduced into the gas suction chamber 59 under the sealing action of the seal member 34. Gas is compressed. Then, the compressed gas that has been compressed is led out from the compressed gas outlet hole 40 to the gas discharge chamber 38 and discharged to a refrigerant circulation system (not shown) through the discharge port 14a (see FIG. 1).

  As described above, in the present embodiment, the bush 66 constituting the scroll compressor 10 is provided with the projection 68 on the axis of the end surface 66a, and is eccentric to the projection 68 in the radially outward direction. Hole 70 is formed. And after inserting the eccentric pin 58 provided in the rotating shaft 48 into the hole part 70, the C-shaped cross-section retaining ring 74 is attached to the annular groove 72 formed at the tip thereof.

  At that time, by engaging the opening portion 76 of the retaining ring 74 with the projection 68, displacement of the retaining ring 74 attached to the annular groove 72 of the eccentric pin 58 in the rotational direction is restricted. At the same time, the displacement of the eccentric pin 58 along the axial direction (directions of arrows A and B) is also restricted.

  As a result, by providing the projection 68 that serves as a detent for the retaining ring 74 at the central portion on the axis of the bush 66, for example, the projection 68 can be formed simultaneously when the bush 66 is processed. Therefore, compared with the prior art in which the protrusion is eccentric with respect to the center of the bush, the processing time can be shortened and the processing steps can be reduced, and the scroll compressor 10 including the bush 66 can be reduced. Manufacturability can be improved.

  Specifically, when the bush 66 is processed by a lathe, the rotation center when the outer peripheral surface of the bush 66 is processed is the same as the rotation center when the protrusion 68 is formed. Without changing the rotation center of 66, the protrusion 68 can be processed together when the outer peripheral surface of the bush 66 is processed, so that the efficiency of the processing operation can be improved.

  In the scroll compressor 10 described above, the configuration in which the orbiting bearing 64 directly contacts the outer peripheral surface of the bush 66 has been described. However, the present invention is not limited to this. A cylindrical collar may be interposed between the bush 66. In this case, the bush 66 is rotatably supported by the swivel bearing 64 via a collar provided on the outer peripheral side of the bush 66.

  Next, bushes 100, 110, and 120 according to first to third modifications constituting the scroll compressor 10 will be described with reference to FIGS.

  As shown in FIG. 7, the bush 100 according to the first modification has a radius R1 of the hole 70 with respect to a separation distance L2 between the center C1 of the hole 70 and the center C2 of the protrusion 102. It is different from the bush 66 according to the present embodiment in that it is set large (R1> L2).

  In this bush 100, the outer peripheral surface of the hole 70 is formed to be outside with respect to the center C2 of the protrusion 102, and the hole 70 overlaps the protrusion 102. About half of the protrusions 102 formed in the shape are cut out in an arc shape. That is, the protrusion 102 is formed in a substantially semicircular cross section, and the protrusion 102 and the hole 70 are arranged close to each other.

  By adopting such a configuration, it is possible to set the outer diameter of the bush 66 small by disposing the hole 70 close to the protrusion 102 on the end surface of the bush 100. The scroll compressor 10 including the bush 100 can be downsized.

  Next, as shown in FIG. 8, the bush 110 according to the second modification has a distance L1 obtained by adding the radius R1 of the hole 70 and the radius R2 of the protrusion 112 to the center C1 of the hole 70. It differs from the bushes 66 and 100 according to the present embodiment in that it is set to be smaller or equal (R1 + R2 = L1 ≦ L2) with respect to the separation distance L2 from the center C2 of the protrusion 112. .

  In the bush 110, the hole portion 70 and the protrusion portion 112 do not overlap each other on the end face, and are arranged at a predetermined distance from each other. Therefore, the protrusion portion 112 is formed in a circular cross section. By adopting such a configuration, it is possible to secure a larger cross-sectional area of the projection 112 than the bush 66 described above, and therefore, the opening 76 of the retaining ring 74 attached to the eccentric pin 58 can be surely provided. Further, it can be suitably engaged with the protrusion 112 to prevent rotational displacement.

  Finally, as shown in FIG. 9, the bush 120 according to the third modification has a distance L1 obtained by adding the radius R1 of the hole 70 and the radius R2 of the protrusion 122 to the center C1 of the hole 70. A plurality of first and second holes 124 different from the hole 70 are set so as to be larger than the separation distance L2 between the center C2 of the protrusion 122 (R1 + R2 = L1> L2). , 126 is different from the bush 66 according to the present embodiment.

  The bush 120 has, for example, a first hole 124 that is eccentric with respect to the hole 70 and functions as a balance adjustment hole of the bush 120, and the first hole 124 has a smaller diameter than the hole 70. It is formed so as to partially overlap the outer periphery of the protrusion 122. The first hole 124 is not limited to the case where the diameter is smaller than that of the hole 70 described above. The first hole 124 may be larger than the hole 70 or may have the same diameter, and other than the balance adjustment hole. You may make it use for the use of. Further, the first hole portion 124 is not limited to the case where the first hole portion 124 penetrates in the axial direction of the bush 120 (the direction of the arrows A and B), and is a bottomed hole formed at a predetermined depth from the end surface 120a of the bush 120. Also good.

  The second hole 126 is formed so as to be eccentric with respect to any of the hole 70, the first hole 124, and the protrusion 122 and overlap with the hole 70 and the protrusion 122, and The hole 70 and the first hole 124 are formed with a smaller diameter. The second hole 126 is used, for example, as a lubricating hole to which lubricating oil is supplied.

  That is, in the bush 120, the hole 70, the first and second holes 124 and 126 all overlap with the protrusion 122, and a part of the protrusion 122 is cut away. The cross-sectional shape has three arc portions 128, 130, 132 formed by the hole portion 70 and the first and second hole portions 124, 126.

  In addition, for example, in the above-described bushes 66, 100, 110, 120, by setting the diameter of the hole 70 large, the diameter of the eccentric pin 58 inserted through the hole 70 can also be set large. The strength of the eccentric pin 58 can be improved. On the other hand, by setting the diameter of the protrusions 68, 102, 112, 122 large, the amount of cutting when the protrusions 68, 102, 112, 122 are processed Therefore, the machining time can be shortened.

  That is, as described above, in the bushes 66, 100, 110, 120, by appropriately changing the separation distance between the projections 68, 102, 112, 122 and the hole 70, or the diameter of the hole 70, It becomes possible to increase the degree of design freedom in the bushes 66, 100, 110, 120.

  Further, instead of the above-described retaining ring 74, rings 150, 160, 170, 180 having an opening 76 opened in a direction orthogonal to the axis with respect to the eccentric pin 58 as shown in FIGS. 10A to 10D are used. You may do it.

  FIG. 10A shows a retaining ring 150 having a spring shape and a curved cross section, and has an elastic force in the axial direction (thrust direction) of the eccentric pin 58. When the retaining ring 150 is attached to the eccentric pin 58, the retaining ring 150 is held between the eccentric pin 58 and the end surface 66a of the bush 66. Shaking in the axial direction (directions of arrows A and B) is prevented.

  Next, FIG. 10B shows a retaining ring 160 having a smaller outer diameter compared to the retaining ring 74 described above, and suppresses the amount of protrusion in the radially outward direction when attached to the eccentric pin 58. be able to. As a result, it is preferable to use the retaining ring 160 when the space on the outer peripheral side of the eccentric pin 58 is limited.

  Next, FIG. 10C shows a retaining ring 170 having a U-shaped cross section. Since the thrust load is larger than that of the retaining ring 74 described above, an eccentric pin is attached when the retaining ring 170 is attached. 58 can be held more securely on the end surface 66a of the bush 66. The ring 170 can be easily attached to and detached from the eccentric pin 58.

  Finally, FIG. 10D shows a retaining ring 180 including a pair of semicircular holding portions 182a and 182b and a connecting portion 184 that connects the end portions of the holding portion 182 to each other. The holding portions have a resilience in a direction in which the holding portions approach each other. By using such a retaining ring 180, it can be easily attached to and detached from the eccentric pin 58.

  That is, the retaining ring 180 attached to the eccentric pin 58 has an opening 76 that can be attached to the annular groove 72 of the eccentric pin 58 from the radially outward direction, and the annular groove is interposed through the opening 76. It is only necessary to be able to regulate the displacement of the eccentric pin 58 in the axial direction (directions of arrows A and B) by engaging with 72.

  The scroll compressor according to the present invention is not limited to the above-described embodiment, and can of course have various configurations without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Scroll type compressor 12 ... Front housing 14 ... Rear housing 20 ... Fixed scroll 22 ... Movable scroll 24 ... Fixed side board | substrate part 26 ... Fixed side spiral wall 28 ... Movable side board part 30 ... Movable side spiral wall 32 ... Gas compression Chamber 44 ... Discharge valve 48 ... Rotating shaft 54 ... Support 58 ... Eccentric pin 62 ... Circular recess 64 ... Slewing bearing 66, 100, 110, 120 ... Bush 68, 102, 112, 122 ... Projection 70 ... Hole 72 ... Annular grooves 74, 150, 160, 170, 180 ... retaining ring 76 ... opening 78 ... convex portion

Claims (4)

A fixed scroll having a fixed-side spiral wall, a movable scroll having a movable-side spiral wall, a support to which a rotational force from a rotational drive source is transmitted, an eccentric pin provided eccentrically on the axis of the support, A scroll compressor having a hole into which an eccentric pin is inserted and a bush fitted into the movable scroll, and a retaining ring attached to an end of the eccentric pin inserted through the bush,
The bush is formed on an end surface that is an end portion side of the eccentric pin, and includes a protrusion that engages with an opening of the retaining ring and performs a detent function,
The scroll type compressor, wherein at least a part of a cross-sectional shape along the axial direction of the bush is formed in a concentric arc shape with a center provided on the axial line of the bush. The scroll compressor according to claim 1, wherein
A scroll compressor, wherein a value obtained by adding a radius of the hole and a radius of the protrusion is set to be larger than a separation distance between the center of the hole and the center of the protrusion. In the scroll compressor according to claim 1 or 2,
The scroll compressor according to claim 1, wherein a radius of the hole is set larger than a distance between a center of the hole and a center of the protrusion. In the scroll compressor according to any one of claims 1 to 3,
The scroll-type compressor is characterized in that the cross-sectional shape of the protrusion is formed by combining another arc having a center eccentric in the radial direction with respect to the center of the bush.

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