JP2009019566A - Compressor and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance its accuracy, by arranging a balance weight in a desired position. <P>SOLUTION: A scroll compressor 1 has a crankshaft 17 and the balance weight 71. The crankshaft 17 has a main shaft 17a and an eccentric part 17b. The main shaft 17a rotates around a rotary shaft 90. The eccentric part 17b is positioned on one end 17a1 side of the main shaft 17a in the direction 91 along the rotary shaft 90, and is eccentric from the rotary shaft 90. The balance weight 71 is a separate member from the crankshaft 17, and presents an annular shape, and is fitted in the main shaft 17a. A positioning mark of the balance weight 71 is arranged on the crankshaft 17. For example, the mark is arranged on the main shaft 17a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a compressor and a manufacturing method thereof, and more particularly to positioning of a balance weight.

  In the scroll compressor, a balance weight is disposed on the crankshaft in order to balance the movable scroll that revolves around the rotating shaft. Similarly, in a compressor such as a rotary compressor, a balance weight is disposed on the crankshaft.

  Conventionally, a balance weight that is a separate member from the crankshaft and that fits into the crankshaft has been employed. This is to facilitate attachment of other members to the crankshaft, for example, fitting of a rolling bearing that supports the crankshaft.

In addition, the technique relevant to this invention is shown below.
JP 2004-293531 A JP 2003-328963 A

  However, it is difficult to determine at which position the balance weight is fixed when the balance weight is fitted onto the crankshaft. Specifically, it is difficult to determine in which direction the direction in which the center of gravity of the balance weight is eccentric from the rotation axis (hereinafter referred to as “the eccentric direction of the balance weight”) is directed.

  Since the crankshaft is provided with an eccentric portion that slidably supports the center of the movable scroll, for example, the direction in which the eccentric portion is eccentric from the rotation shaft (hereinafter referred to as “the eccentric direction of the eccentric portion”). It is conceivable to determine the eccentric direction of the balance weight based on the above.

  However, although the eccentric part is eccentric from the rotation axis, it is unevenly distributed in the vicinity of the rotation axis. For this reason, it was difficult to obtain the eccentric direction of the eccentric portion itself.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to arrange a balance weight at a desired position and improve its accuracy.

  A compressor according to a first invention includes a crankshaft and a balance weight. The crankshaft has a main shaft and an eccentric portion. The main shaft rotates about the rotation axis. The eccentric part is located on one end side of the main shaft in the direction along the rotation axis and is eccentric from the rotation axis. The balance weight is a member different from the crankshaft, has an annular shape, and is fitted into the main shaft. A mark for positioning the balance weight is provided on the crankshaft.

  The compressor concerning 2nd invention is a compressor concerning 1st invention, Comprising: A part of side surface of a crankshaft is a plane as a mark.

  A compressor according to a third invention is the compressor according to the first or second invention, and the mark is provided on the main shaft.

  A compressor according to a fourth invention is the compressor according to the first or second invention, wherein the crankshaft further includes an intermediate member positioned between the main shaft and the eccentric portion. And the mark is provided in the intermediate member.

  A compressor manufacturing method according to a fifth invention is a method for manufacturing a compressor according to any one of the first to fourth inventions, and includes the first and second steps. In the first step, the position of the balance weight is determined based on the mark. In the second step, the balance weight is fitted into the main shaft from the other end, and is fixed at the position determined in the first step.

  A compressor manufacturing method according to a sixth invention is a method according to the fifth invention for manufacturing a compressor further including a bearing, and further includes a third step. The bearing has an inner ring fitted into the main shaft, a rolling member, and an outer ring. The outer ring is disposed on the outer peripheral side of the inner ring and sandwiches a rolling member between the inner ring and the inner ring. In the third step, the inner ring is fitted to the main shaft from the other end before the second step.

  A compressor manufacturing method according to a seventh invention is a method of manufacturing a compressor including a crankshaft and a balance weight, and includes first and second steps. The crankshaft has a main shaft and an eccentric portion. The main shaft rotates about the rotation axis. The eccentric part is located on one end side of the main shaft in the direction along the rotation axis and is eccentric from the rotation axis. The balance weight is a member different from the crankshaft, has an annular shape, and is fitted into the main shaft. In the first step, the balance weight is fitted into the main shaft from the other end. In the second step, after the first step, one end of the crankshaft end opposite to the other end of the main shaft is processed to obtain an eccentric portion.

  According to the compressor according to the first aspect of the present invention, even if it is difficult to determine the position of the balance weight based on the eccentric direction of the eccentric portion, the balance weight of the balance weight can be reduced by using the mark provided on the crankshaft. The position can be determined with high accuracy. Therefore, the balance weight can be arranged at a desired position in relation to the position of the eccentric portion, and the accuracy is high.

  According to the compressor according to the second aspect of the present invention, the direction orthogonal to the plane can be determined with high accuracy, so that the position of the balance weight can be determined using this direction.

  According to the compressor of the third aspect of the invention, since the positioning mark is provided on the main shaft, it is not necessary to provide the mark on the eccentric part. Therefore, leakage of the lubricating oil can be prevented.

  According to the compressor of the fourth aspect of the invention, since the positioning mark is provided on the intermediate member, it is not necessary to provide the mark on the eccentric portion. Therefore, leakage of the lubricating oil can be prevented.

  According to the compressor manufacturing method of the fifth invention, even if it is difficult to determine the position of the balance weight based on the eccentric direction of the eccentric portion, the position of the balance weight can be accurately determined by using the mark. I can decide well. Therefore, the balance weight can be arranged at a desired position in relation to the position of the eccentric portion, and the accuracy is high.

  According to the compressor manufacturing method of the sixth invention, the inner ring is positioned between the eccentric part and the balance weight even when the inner ring cannot be fitted from the eccentric part side to the crankshaft. be able to.

  According to the compressor manufacturing method of the seventh aspect of the present invention, the processing of one end of the crankshaft in the second step is executed after the first step of fitting the balance weight. Therefore, the eccentric part can be arranged at a desired position, and its accuracy is high.

1. 1. First embodiment 1-1. 1 is a diagram conceptually showing a scroll compressor 1 according to an embodiment of the present invention. Note that FIG. 1 shows a direction 91, and in the following, the tip side of the arrow in the direction 91 is referred to as “upper side” and the opposite side is referred to as “lower side”.

  The scroll compressor 1 includes a housing 11, a housing 12, a compression mechanism 15, a motor 16, a crankshaft 17, a rolling bearing 31, a bearing 60, and a balance weight 71. Hereinafter, each of the components will be specifically described.

<Case>
The casing 11 has a cylindrical shape with the upper end closed, and extends along the direction 91. The housing 11 houses a housing 12, a compression mechanism 15, a motor 16, a crankshaft 17, a rolling bearing 31, a bearing 60, and a balance weight 71.

<Motor>
The motor 16 has a stator 51 and a rotor 52. The stator 51 is annular and is fixed to the inner wall 11 a of the housing 11. The rotor 52 is rotatable about the rotation shaft 90, is provided on the inner peripheral side of the stator 51, and faces the stator 51 via an air gap. In FIG. 1, the direction along the rotation axis 90 coincides with the direction 91.

<Crankshaft>
The crankshaft 17 extends along the direction 91 and includes a main shaft 17a and an eccentric portion 17b. The main shaft 17 a is a portion that rotates about the rotation shaft 90 and is connected to the rotor 52. The lower portion of the main shaft 17a is slidably supported by a bearing 60.

  The eccentric portion 17b is a portion that is offset from the rotating shaft 90, and is located on the upper side (one end 17a1 side) of the main shaft 17a.

<Balance weight>
The balance weight 71 is a separate member from the crankshaft 17 and has an annular shape and is fitted into the main shaft 17a. This will be specifically described with reference to FIGS.

  FIG. 2 is a view of the balance weight 71 as viewed from above. FIG. 3 is a view showing a cross section of the balance weight 71 at the position III-III shown in FIG.

  The balance weight 71 has portions 711 and 712. The center of gravity of the portion 711 is on the rotation axis 90, and the outer peripheral surface 711a of the portion 711 when viewed from the direction 91 has a circular shape.

  The center of gravity of the portion 712 is eccentric from the rotation axis 90. The center of gravity is eccentric from the rotary shaft 90 in a predetermined direction 92. Therefore, the center of gravity of the entire balance weight 71 is also eccentric from the rotation shaft 90 in the predetermined direction 92. Note that the portion 712 is located below the portion 711.

  A movable scroll 26 described later is slidably supported by the eccentric portion 17b of the crankshaft 17 in the vicinity of the center thereof. Therefore, the movable scroll 26 is also eccentric in the same direction as the eccentric part 17b.

  For this reason, it is possible to balance the movable scroll 26 by arranging the balance weight 71 on the main shaft 17a so that the predetermined direction 92 is opposite to the eccentric direction of the eccentric portion 17b. Accordingly, the swing of the crankshaft 17 is prevented.

<Housing>
The housing 12 includes an annular member 121 and a fixing member 122. The annular member 121 surrounds the main shaft 17a, and is fixed to the fixing member 122 at a position below the rolling bearing 31 described later.

  The annular member 121 is close to the outer peripheral surface 711a of the portion 711 of the balance weight 71 (FIG. 1). The reason why the annular member 121 is brought close to the balance weight 71 instead of the main shaft 17a will be described later.

  The annular member 121 is close to the portion 711 of the balance weight 71 but is not in contact therewith. For this reason, there is a gap between the annular member 121 and the portion 711.

  In the scroll compressor 1, a lubricating oil is used to reduce internal mechanical friction. Such lubricating oil is also supplied to the rolling bearing 31. For this reason, the lubricating oil that has flowed out of the rolling bearing 31 may leak into the space 28 from the gap immediately below the rolling bearing 31 and be discharged from the discharge pipe as it is.

  Therefore, for example, sealing between the annular member 121 and the portion 711 prevents the lubricating oil from leaking.

  The fixing member 122 is penetrated by the crankshaft 17 and is fitted to the inner wall 11a of the housing 11 without a gap. For example, the fixing member 122 is fitted to the inner wall 11a by a method such as press fitting or shrink fitting. The fixing member 122 may be fitted to the inner wall 11a through a seal.

  Since the fixing member 122 is fitted to the inner wall 11a without a gap, the housing 12 partitions the space 28 located below the space 12 and the space 29 located above the space 12 without a gap. Therefore, the housing 12 can maintain the pressure difference generated between the space 28 and the space 29. In addition, since the refrigerant | coolant compressed with the compression mechanism 15 flows into the space 28 so that it may mention later, the pressure of the space 28 is high. On the other hand, the pressure in the space 29 is low.

<Rolling bearing>
The rolling bearing 31 includes an inner ring 31a, a rolling member 31b, and an outer ring 31c. The rolling bearing 31 rotatably supports the main shaft 17 a at a position between the eccentric portion 17 b and the balance weight 71.

  Specifically, the inner ring 31a is fitted into the main shaft 17a. The outer ring 31c is fixed to the fixing member 122 of the housing 12 at a position facing the inner ring 31a from the outer peripheral side. The rolling member 31b is sandwiched between the inner ring 31a and the outer ring 31c so as to be freely rollable.

<Compression mechanism>
The compression mechanism 15 includes a fixed scroll 24 and a movable scroll 26 and compresses the refrigerant. As the refrigerant, for example, a refrigerant containing carbon dioxide as a main component can be adopted. Of course, fluids other than carbon dioxide may be compressed.

  The fixed scroll 24 includes an end plate 24a and a compression member 24b. The end plate 24a is fixed to the inner wall 11a of the housing 11, and the compression member 24b is connected to the lower side of the end plate 24a. The compression member 24b extends in a spiral shape, and a groove 24c is formed between the spiral members.

  The upper surface of the fixed scroll 24 has a concave shape. A space 45 surrounded by a concave portion 42 of the surface is closed with a lid 44. The lid 44 partitions the two spaces having different pressures, that is, the space 45 and the space 29 above the space 45.

  The movable scroll 26 includes an end plate 26a, a compression member 26b, and a bearing 26c. The compression member 26b is connected to the upper side of the end plate 26a and extends in a spiral shape.

  The compression member 26 b fits in the groove 24 c of the fixed scroll 24. In the compression mechanism 15, the space 40 between the compression member 24b and the compression member 26b is used as a compression chamber by being sealed with the end plates 24a and 26a.

  The refrigerant compressed in the compression chamber (space 40) is discharged from the discharge port 41 provided near the center of the fixed scroll 24 to the space 45. The refrigerant in the space 45 flows to the space 28 through the fixed scroll 24 and the passage provided in the housing 12. Therefore, the pressure in the space 45 and the pressure in the space 28 are high.

  On the other hand, the pressure in the space 29 partitioned from the space 45 by the lid 44 remains small.

  The bearing 26c is connected to the vicinity of the center below the end plate 26a, and supports the eccentric portion 17b of the crankshaft 17 in a slidable manner. This content can be grasped when the eccentric portion 17b supports the vicinity of the center of the movable scroll 26 slidably.

  When the crankshaft 17 rotates, the eccentric portion 17b revolves around the rotating shaft 90, and thus the movable scroll 26 revolves around the rotating shaft 90.

1-2. Marks for positioning the balance weights The crankshaft 17 is provided with marks for positioning the balance weights 71. By providing such a mark, even if it is difficult to determine the position of the balance weight 71 based on the eccentric direction of the eccentric portion 17b, the position of the balance weight can be accurately determined using the mark. Therefore, the balance weight 71 can be disposed at a desired position in relation to the position of the eccentric portion 17b, and the accuracy thereof is high. This will be specifically described below.

<Position and shape of mark (Part 1)>
4 and 5 are diagrams conceptually showing the position and shape of the positioning mark 101. FIG. 4 is a side view of the crankshaft 17, and FIG. 5 is a view of the main shaft 17a as viewed from the lower end 17a2.

  The mark 101 is particularly provided on the main shaft 17a of the crankshaft 17. The mark 101 is obtained, for example, by forming a part of the side surface of the main shaft 17a into a flat surface, or by cutting a part of the side surface of the main shaft 17a into a flat surface (FIGS. 4 and 5).

  By adopting a plane portion as the mark 101, the direction orthogonal to the plane can be determined with high accuracy. Therefore, the position of the balance weight 71, specifically, the eccentric direction of the balance weight 71 can be accurately determined using such a direction.

  In addition, as long as the position of the balance weight can be determined, it may be a mark having another shape. In addition, the side surface of the main shaft 17a colored with paint or the like may be used as a mark.

  By the way, if the mark 101 is provided on the portion supported by the bearing or the portion to be sealed, the compression performance of the scroll compressor 1 may be affected. In particular, when a planar portion is employed as the mark 101, leakage of compressed refrigerant or lubricating oil and deterioration of sealing performance are likely to occur.

  Therefore, in FIG. 4, the mark 101 is provided at a position near the lower end 17a2 of the main shaft 17a. At a position near the lower end 17a2 of the main shaft 17a, the main shaft 17a is not supported by a bearing, and is not sealed with other members. Therefore, even if the mark 101 is provided at such a position, the compression performance of the scroll compressor 1 is not affected.

<Position and shape of mark (Part 2)>
6 and 7 are diagrams conceptually showing the position and shape of the positioning mark 102. 6 is a side view of the crankshaft 17, and FIG. 7 is a view of the crankshaft 17 as viewed from the eccentric portion 17b side.

  The crankshaft 17 further includes an intermediate member 17c located between the main shaft 17a and the eccentric portion 17b.

  Since the eccentric portion 17b supports the movable scroll 26, when the movable scroll 26 revolves around the rotating shaft 90, centrifugal force generated in the movable scroll 26 is applied to the eccentric portion 17b. For this reason, it is easy to bend the eccentric part 17b and to determine the eccentric part 17b from the main shaft 17a.

  Therefore, the intermediate member 17c is provided to increase the strength of the crankshaft 17 at a position between the main shaft 17a and the eccentric portion 17b. Thereby, the bending of the eccentric part 17b and the fracture | rupture from the main axis | shaft 17a can be prevented.

  The mark 102 shown in FIGS. 6 and 7 is provided on the intermediate member 17c of the crankshaft 17 in particular. The mark 102 is obtained by, for example, forming a part of the side surface of the intermediate member 17c into a flat surface, or cutting a part of the side surface of the intermediate member 17c into a flat surface (FIGS. 6 and 7).

  By adopting a plane portion as the mark 102, the direction orthogonal to the plane can be accurately determined. Therefore, the position of the balance weight 71, specifically, the eccentric direction of the balance weight 71 can be accurately determined using such a direction.

  In addition, as long as the position of the balance weight can be determined, it may be a mark having another shape. In addition, the intermediate member 17c colored with paint or the like may be used as a mark.

  The intermediate member 17c is not supported by a bearing and is not sealed with other members. Therefore, even if the mark 102 is provided on the intermediate member 17c, the compression performance of the scroll compressor 1 is not affected.

1-3. Scroll compressor manufacturing method <Installation of balance weight>
FIG. 8 is a diagram showing a method for attaching a balance weight to the crankshaft 17 among the methods for manufacturing the scroll compressor.

  First, the inner ring 31a of the rolling bearing 31 is fitted into the main shaft 17a of the crankshaft 17 from the lower end 17a2 and fixed at a predetermined position r1 (step A).

  Based on the marks 101 and 102 (FIGS. 4 to 7), the position of the balance weight 71 is determined (step B). Specifically, the eccentric direction of the balance weight 71 is determined. The process B may be executed before the process A or may be executed in parallel with the process A.

  After the execution of the process A and the process B, the balance weight is fitted into the main shaft 17a from the lower end 17a2 and fixed at a predetermined position r2 (process C). At this time, the eccentric direction of the balance weight 71 is directed to the direction determined in the process B.

  According to this method, by using the marks 101 and 102, the balance weight 71 can be arranged at a desired position in relation to the position of the eccentric portion 17b, and the accuracy thereof is high.

  By the way, when viewed from the direction 91, the eccentric portion 17b and the intermediate member 17c protrude from the outer periphery of the main shaft. Moreover, considering that the inner ring 31a of the rolling bearing 31 is fitted into the main shaft 17a, the inner periphery of the inner ring 31a substantially coincides with the outer periphery of the main shaft 17a. For this reason, the inner ring 31 a cannot be fitted from the eccentric portion 17 b side of the crankshaft 17.

  However, according to the method described above, the process A is performed before the process C for fitting the balance weight 71, and the inner ring 31a is fitted to the main shaft 17a. Therefore, even when the inner ring 31a cannot be fitted from the eccentric part 17b side of the crankshaft 17, the inner ring 31a is arranged at a predetermined position r1, that is, a position between the eccentric part 17b and the balance weight 71. be able to.

<Attaching the crankshaft 17>
The crankshaft 17 to which the balance weight 71 is attached is inserted into the annular member 121 from the lower side of the housing 12 with the eccentric portion 17b facing upward (FIG. 1). At this time, the eccentric portion 17 b and the inner ring 31 a fixed to the main shaft 17 a need to pass through the annular member 121. This is because, as described above, in the scroll compressor 1, the rolling bearing 31 is located above the annular member 121.

  For this reason, when the annular member 121 is close to the main shaft 17a, the eccentric portion 17b and the inner ring 31a cannot pass through the annular member 121 when the crankshaft 17 is inserted into the annular member 121.

  Therefore, as described above, the balance weight 71 is provided with the portion 711, and the annular member 121 is brought close to the portion 711. At this time, the inner periphery of the annular member 121 is located outside the outermost periphery of the eccentric portion 17b and the inner ring 31a.

  Therefore, the eccentric part 17b and the inner ring 31a can pass through the annular member 121. In addition, when the seal | sticker is given to the part 711 as mentioned above, the outer periphery of a sealing member should just be located outside the outermost periphery of the eccentric part 17b and the inner ring | wheel 31a.

  In step C, the balance weight 71 is fitted into the main shaft 17a by, for example, a narrow fit. When the portion 711 is sealed, if the portion 711 is also fixed to the main shaft by a narrow fit, the portion 711 may be deformed. When the portion 711 is deformed, the sealing performance is lowered.

  Therefore, only the portion 712 is fitted. Specifically, the following shape is adopted for the balance weight 71. That is, the portions 711 and 712 are provided with insertion holes 711b and 712b into which the main shaft 17a is inserted, respectively, but the insertion holes 711b provided in the portion 711 are more than the insertion holes 712b provided in the portion 712. Keep it thick (Figure 3).

2. 2nd Embodiment FIGS. 9-11 is a figure which shows the manufacturing method different from the manufacturing method of the scroll compressor 1 demonstrated in 1st Embodiment in process order. Note that the scroll compressor 1 described in the first embodiment can also be obtained by the manufacturing method of the present embodiment. Therefore, the description of the structure of the scroll compressor 1 is omitted.

  First, a crankshaft 17A having a main shaft 17a and a member 171 located at the upper end 17a1 of the main shaft 17a is prepared (FIG. 9). The member 171 is obtained by processing the eccentric portion 17b.

  Step a is performed on the crankshaft 17A. In step a, the inner ring 31a of the rolling bearing 31 is fitted from the lower end 17a2 (FIG. 9) and fixed to the main shaft 17a at a predetermined position r3 (FIG. 10).

  After execution of step a, step b is executed. In step b, the balance weight 71 is fitted from the lower end 17a2 (FIG. 9) and fixed to the main shaft 17a at a predetermined position r4 (FIG. 10).

  After the execution of the process b, the process c is executed. In step c, the member 171 is processed based on the eccentric direction of the balance weight 71 to obtain the eccentric portion 17b eccentric in the predetermined direction 93 (FIG. 11).

  Thereby, the crankshaft 17 having the main shaft 17a and the eccentric portion 17b is obtained. In addition, the content of the process c can be grasped | ascertained by processing the end of the crankshaft 17A and obtaining the eccentric part 17b.

  According to this method, since the processing (step c) of the member 171 is performed after the steps a and b in which the inner ring 31a and the balance weight 71 are fitted, the eccentric portion is related to the position of the balance weight 71. 17b can be arranged at a desired position. Specifically, the eccentric portion 17b can be eccentric in a desired direction (predetermined direction 93), and its accuracy is high. The eccentric direction of the balance weight 71 can be easily obtained by measurement or the like.

  Moreover, since the inner ring 31a is fitted to the main shaft 17a by performing the step a before the step b for fitting the balance weight 71, the inner ring 31a cannot be fitted from the member 171 side of the crankshaft 17A. Also, the inner ring 31a can be arranged at a predetermined position r3, that is, a position between the member 171 and the balance weight 71.

  Also in the present embodiment, the balance weight 71 is provided with the portion 711 for the same reason as described in the first embodiment.

It is a figure which shows notionally the scroll compressor 1 demonstrated by 1st Embodiment. It is the figure which looked at the balance weight 71 from the top. It is a figure which shows the cross section of the balance weight 71 in the position III-III shown by FIG. 3 is a side view of the crankshaft 17. FIG. It is the figure which looked at the main axis | shaft 17a from the lower end 17a2. 3 is a side view of the crankshaft 17. FIG. It is the figure which looked at the crankshaft 17 from the eccentric part 17b side. FIG. 5 is a diagram illustrating a method for attaching a balance weight 71 to a crankshaft 17. It is a figure which shows the manufacturing method of the scroll compressor 1 demonstrated in 2nd Embodiment in order of a process. It is a figure which shows the manufacturing method of the scroll compressor 1 in order of a process. It is a figure which shows the manufacturing method of the scroll compressor 1 in order of a process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Scroll compressor 17 Crankshaft 17a Main shaft 17a1 One end 17a2 Other end 17b Eccentric part 17c Intermediate member 31 Rolling bearing 31a Inner ring 31b Rolling member 31c Outer ring 71 Balance weight 90 Rotating shaft 101, 102 Mark

Claims (7)

A main shaft (17a) that rotates about the rotation shaft (90), and an eccentric portion (17b) that is located on one end (17a1) side of the main shaft in the direction along the rotation shaft and is eccentric from the rotation shaft. A crankshaft (17);
A compressor (1) that is a separate member from the crankshaft and has a ring shape and a balance weight (71) fitted into the main shaft;
The compressor, wherein the crankshaft is provided with a mark (101; 102) for positioning the balance weight.   The compressor according to claim 1, wherein a part of a side surface of the crankshaft (17) is a flat surface as the mark (101; 102).   The compressor according to claim 1 or 2, wherein the mark (101; 102) is provided on the main shaft (17a). The crankshaft (17) further includes an intermediate member (17c) positioned between the main shaft (17a) and the eccentric portion (17b),
The compressor according to claim 1 or 2, wherein the mark (102) is provided on the intermediate member. A method for manufacturing the compressor (1) according to any one of claims 1 to 4,
A first step of determining the position of the balance weight (71) based on the mark (101; 102);
A compression mechanism manufacturing method comprising: a second step of fitting the balance weight (71) into the main shaft from the other end (17a2) and fixing the balance weight (71) at the position determined in the first step. A bearing having an inner ring (31a) fitted into the main shaft (17a), a rolling member (31b), and an outer ring (31c) arranged on the outer peripheral side of the inner ring and sandwiching the rolling member between the inner ring and the inner ring. (31)
A method according to claim 5, wherein the compressor (1) further comprises:
Prior to the second step, the compression mechanism manufacturing method further includes a third step of fitting the inner ring into the main shaft from the other end (17a2). A main shaft (17a) that rotates about the rotation shaft (90), and an eccentric portion (17b) that is located on one end (17a1) side of the main shaft in the direction along the rotation shaft and is eccentric from the rotation shaft. A crankshaft (17);
A method of manufacturing a compressor (1), which is a separate member from the crankshaft, has an annular shape, and includes a balance weight (71) fitted into the main shaft,
A first step of fitting the balance weight into the main shaft from the other end (17a2);
After the first step, a second step of processing one end of the end of the crankshaft opposite to the other end of the main shaft to obtain the eccentric portion, and a method for manufacturing a compressor .

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