DESCRIPTION
Title of Invention
ROTARY COMPRESSOR AND METHOD OF MANUFACTURING THE SAME
Technical Fieid
[0001]
The present invention relates to a rotary compressor and a method of manufacturing the rotary compressor relating to a vane receiving groove surface of a cylinder that defines a vane receiving groove in the cylinder. Background Art [0002]
In general, a cylinder that defines a compression chamber of a rotary compressor has a vane receiving groove extending from an inner circumferential surface of the cylinder to an outer circumference surface of the cylinder so that a vane that separates the inside of the cylinder into a low-pressure side and a high-pressure side is slidable in a radial direction of the cylinder. As a related-art method of processing a surface defining this vane receiving groove (vane receiving groove surface), a method for performing second processing is known. With this method, the second processing described below is performed after first processing (see, for example, Patent Literature 1) in which the vane receiving groove is formed by cutting with a broaching edge that includes multiple edges arranged therein. [0003]
In the second processing, a grindstone is inserted into the inside of the cylinder in a perpendicular direction of the cylinder while a support member is secured to a distal end portion of a processing apparatus main body. This support member includes a securing portion that secures the support member to a distal end of the processing apparatus main body, an arm portion that holds the grindstone such that both side surfaces of the grindstone face and are interposed between parts of the arm portion while part of the grindstone projects outward from the arm portion, a belt that transmits a rotational motive force from a drive motor (not illustrated) of the processing apparatus main body to a grindstone shaft of the grindstone, and a

bearing by which the grindstone shaft of the grindstone is rotatably supported. The grindstone is inserted into the vane receiving groove of the cylinder while being rotated, so that the outer circumferential surface of the grindstone to which the abrasive grains are fixed is brought into contact with the vane receiving groove surface of the cylinder, and the grindstone is moved in the radial direction of the cylinder while the contact between the outer circumferential surface of the grindstone and the vane receiving groove surface is kept. In this way, surface flatness (surface roughness), planarity, parallelism, the groove width, and so forth of the vane receiving groove surface of the cylinder are machined (see, for example, Patent Literature 2). Citation List Patent Literature [0004]
Patent Literature 1: Japanese Unexamined Patent Application Publication No. 7-124818
Patent Literature 2: Japanese Unexamined Patent Application Publication No. 2003-340705 Summary of Invention Technical Problem [0005]
In the cylinder of the rotary compressor, an eccentric ring is rotated at high speed. In addition, the vane guided by the vane receiving groove surface of the cylinder reciprocates (slides) in the vane receiving groove in accordance with the eccentricity while being in contact with the vane receiving groove surface of the cylinder and pressed against the eccentric ring by a spring. [0006]
In this case, a gap (clearance) is provided between the vane and the vane receiving groove surface to allow the vane to slide in the vane receiving groove. However, when the gap between the vane and the vane receiving groove surface is large, a compressed refrigerant gas in the cylinder leaks through the gap. This reduces compression efficiency, and accordingly, increases input to the compressor.

Accordingly, with the related-art processing method (second processing) of the vane receiving groove surface of the cylinder, a surface is ground to reduce the gap between the vane and the vane receiving groove surface. Thus, the leakage of the refrigerant gas is suppressed to reduce leakage losses and improve compression efficiency. [0007]
However, when the size of the gap between the vane and the vane receiving groove surface is reduced, oil for smooth sliding of the vane is unlikely to enter the gap between the vane and the vane receiving groove surface. Accordingly, an oil film is not formed between a surface of the vane and the vane receiving groove surface. Thus, the vane slides while being in direct contact with the vane receiving groove surface. This generates friction between the vane and the vane receiving groove surface, and accordingly, the sliding property of the vane is degraded. As a result there is a problem in that noise and sliding losses increase. [0008]
The present invention is made to solve the above described problem, and an object of the present invention is to provide a rotary compressor and a method of manufacturing the rotary compressor with which noise and sliding losses are suppressed. Solution to Problem [0009]
A rotary compressor according to an embodiment of the present invention includes a sealed container and a rotary compression mechanical unit. The rotary compression mechanical unit is provided in the sealed container and compresses refrigerant. The rotary compression mechanical unit Includes a cylinder that has a vane receiving groove extending from an inner circumferential surface toward an outer circumference surface and a vane that is disposed in the vane receiving groove and that slides along a vane receiving groove surface defining the vane receiving groove. A recessed valley portion is formed in the vane receiving groove surface,

and a pitch W of the valley portions is from 2 to 3 \im. in the vane receiving groove surface, a projecting valley portion depth Rvk is from 3.0 to smaller than 5.0 jam. Advantageous Effects of Invention [0010]
With the rotary compressor according to the embodiment of the present invention, the recessed vailey portion is formed in the vane receiving groove surface that defines the vane receiving groove, and the pitch W of the vailey portion is from 2 to 3 fim. The projecting valley portion depth Rvk is from 3 to smaller than 5.0 ^m. Thus, a holding property of oil entering the gap (clearance) between the vane and the vane receiving groove surface during sliding of the vane can be improved. This can improve the sliding property of the vane, and accordingly, reduce noise and sliding losses.
Brief Description of Drawings [0011]
[Fig. 1] Fig. 1 is a longitudinal sectional view of a rotary compressor according to Embodiment of the present invention.
[Fig. 2] Fig. 2 is a plan view of a rotary compression mechanical unit of the rotary compressor according to Embodiment of the present invention.
[Fig. 3] Fig. 3 is an enlarged view of a main part of Fig. 2.
[Fig. 4] Fig. 4 illustrates a first processing member secured to a distal end portion of a processing apparatus main body that is used for second processing according to Embodiment of the present invention.
[Fig. 5] Fig. 5 is a schematic view of a grindstone having an outer circumferential surface to which abrasive grains are fixed according to Embodiment of the present invention.
[Fig. 6] Fig. 6 illustrates the relationship between the position in the radial direction on a vane receiving groove surface of a cylinder formed by second processing according to Embodiment of the present invention and the surface flatness of the vane receiving groove surface of the cylinder.

[Fig. 7] Fig. 7 illustrates a support member used for finish processing according to Embodiment of the present invention.
[Fig. 8] Fig. 8 illustrates the relationship between the position in the radial direction on the vane receiving groove surface of the cylinder and the surface flatness of the vane receiving groove surface of the cylinder after the vane receiving groove surface has undergone the finish processing according to Embodiment of the present invention.
[Fig. 9] Ftg. 9 illustrates the relationships between elapsed testing time and the coefficient of friction of the vane receiving groove surface of the cylinder formed by a processing method according to Embodiment of the present invention and a related-art processing method.
[Fig. 10] Fig. 10 is a graph illustrating the relationship between the coefficient of friction and the depth of valiey portions of a vane receiving groove according to Embodiment of the present invention.
[Fig. 11] Fig. 11 illustrates the relationship between the position in the radial direction on a vane receiving groove surface of a cylinder formed by a related-art second processing and the surface flatness of the vane receiving groove surface of the cylinder.
Description of Embodiment [0012]
Embodiment of the present invention will be described below with reference to the drawings. It should be understood that the present invention is not limited by Embodiment described below. Furthermore, the relationships between the sizes of elements in the following drawings do not necessarily match to the relationships between the actual sizes of the elements. [0013] Embodiment
Fig. 1 is a longitudinal sectional view of a rotary compressor 1 according to Embodiment of the present invention. Fig. 2 is a plan view of a rotary compression

mechanica! unit 4 of the rotary compressor 1 according to Embodiment of the present invention. Fig. 3 is an enlarged view of a main part of Fig. 2.
The rotary compressor 1 according to Embodiment of the present invention is of a single cylinder type as illustrated in Fig. 1. The rotary compressor 1 includes a sealed container 2, the rotary compression mechanical unit 4, and an electrical drive element 12. The cylindrical sealed container 2 is formed of a steel plate. The rotary compression mechanical unit 4 is disposed on a lower side of an inner space of the sealed container 2 and a compresses refrigerant gas. The electrical drive element 12 is disposed on an upper side of the inner space of the sealed container 2 and rotates the rotary compression mechanical unit 4 connected to the electrical drive element 12 through a rotational shaft 3. Furthermore, oil for lubricating bearings is stored at a bottom portion of the sealed container 2. [0014]
The rotary compression mechanical unit 4 includes a cylinder 5, an eccentric portion 8, and an eccentric ring 6. The hollow cylinder 5 defines a compression chamber provided for compressing the refrigerant gas. The eccentric portion 8 is located in the cylinder 5 and provided on the rotational shaft 3. The eccentric ring 6 is attached to the eccentric portion 8. The rotational shaft 3 driven by the electrical drive element 12 causes the eccentric ring 6 to perform a rotational movement in the cylinder 5. Furthermore, an upper cover 10 and a lower cover 7 are respectively attached to the top and the bottom of the cylinder 5. The upper cover 10 and the lower cover 7 also function as bearings for the rotational shaft 3 and close opening surfaces of the cylinder 5. [0015]
As illustrated in Figs. 2 and 3, a vane receiving groove 11 for disposing a vane 9 in the cylinder 5 is formed from an inner circumferential surface toward an outer circumference surface of the cylinder 5. The vane 9 disposed in the vane receiving groove 11 separates the inside of the cylinder 5 into a low-pressure side and a high-pressure side. [0016]

The eccentric ring 6 attached to the eccentric portion 8 that is provided on the rotational shaft 3 is rotated at high speed in the cylinder 5. in addition, the vane 9 guided toward the eccentric ring 6 by a surface defining the vane receiving groove 11 (referred to as "vane receiving groove surface 5a" hereafter) of the cylinder 5 is disposed in the vane receiving groove 11. With this structure, the vane 9 reciprocates (slides), in accordance with the eccentricity, along the vane receiving groove surface 5a to compress the refrigerant gas. [0017]
Fig. 4 illustrates a first processing member 20 secured to a distal end portion of a processing apparatus main body that is used for second processing according to Embodiment of the present invention. Fig. 5 is a schematic view of a grindstone 13 having an outer circumference surface to which abrasive grains are fixed according to Embodiment of the present invention.
According to Embodiment, the processing apparatus main body (not illustrated) is used for the second processing in which the vane receiving groove 11 is formed in the cylinder 5. The first processing member 20 illustrated in Fig. 4 is secured to the distal end portion of the processing apparatus main body. [0018]
The first processing member 20 includes a securing portion 14, an arm portion 15, a belt 16, and a bearing 17. The securing portion 14 secures the first processing member 20 to the distal end of the processing apparatus main body. The arm portion 15 holds the grindstone 13 such that both side surfaces of the grindstone 13 face and are interposed between parts of the arm portion 15 while part of the grindstone 13 projects outward from the arm portion 15. The belt 16 transmits a rotational motive force from a drive motor (not illustrated) of the processing apparatus main body to a grindstone shaft 18 of the grindstone 13. The grindstone shaft 18 of the grindstone 13 is rotatably supported by the bearing 17. The grindstone 13 has a discoidal shape as illustrated in Fig. 5 and the abrasive grains are fixed to the outer circumferential surface of the grindstone 13. [0019]

The grindstone 13 is inserted into the cylinder 5 in a perpendicular direction of the cylinder 5 (direction perpendicular to the page of Fig. 2) while the grindstone 13 is rotatably supported by the first processing member 20. Then, the grindstone 13 is inserted into the vane receiving groove 11 of the cylinder 5 while being rotated, so that the outer circumferential surface of the grindstone 13 to which the abrasive grains are fixed is brought into contact with the vane receiving groove surface 5a of the cylinder 5, and the grindstone 13 is moved in the radial direction of the cylinder 5 (vertical direction of Fig. 2) while the contact between the outer circumferential surface of the grindstone 13 and the vane receiving groove surface 5a is kept. In this way, surface flatness (surface roughness), planarity, parallelism, the groove width, and so forth of the vane receiving groove surface 5a of the cylinder 5 are machined. [0020]
Fig. 11 illustrates the relationship between the position in the radial direction on the vane receiving groove surface of the cylinder and the surface flatness of the vane receiving groove surface of the cylinder. Here, the vane receiving groove surface of the cylinder is formed by the related-art second processing. The horizontal axis represents the position in the radial direction, and the vertical axis represents the surface flatness (surface roughness of the vane receiving groove surface). Values on the + side along the vertical axis (for example, 2.0 jam) represent the height of ridge portions projecting from a flat reference position (0.0 \xm) of the vane receiving groove surface. Values on the - side (for example, -2.0 i^m) represent the depth of valley portions recessed from the above-described reference position. These are similarly applicable also to Figs. 6 to 8 to be described later. [0021]
Here, with the related-art second processing, the grain diameter of the abrasive grains fixed to the outer circumferential surface of the grindstone is #140. As illustrated in Fig. 11, the second processing is performed so that Rzjis (ten-point average roughness) representing the surface roughness of the vane receiving groove surface of the cylinder is within 3.0 |im.

[0022]
However, there remain fine ridge portions (parts projecting from a flat reference position of the vane receiving groove surface) on the vane receiving groove surface of the cylinder having a surface roughness Rzjis of within 3.0 jam. Accordingly, during sliding of the vane 9, there occurs a catching between the vane 9 and the vane receiving groove surface of the cylinder. This degrades a sliding property of the vane 9, and accordingly, leads to increases in noise and sliding losses. [0023]
Furthermore, oil is unlikely to enter a gap (clearance) between the vane 9 and the vane receiving groove surface during sliding of the vane 9. Thus, the vane 9 slides while being in direct contact with the vane receiving groove surface. As a result, friction is generated between the vane 9 and the vane receiving groove surface, and accordingly, the sliding property of the vane 9 is degraded. Furthermore, there is not provided a mechanism that allows retention of the oil entering the gap (clearance) between the vane 9 and the vane receiving groove surface. This leads to a failure in forming an oil film. [0024]
In view of these, according to Embodiment, the grain diameter of the abrasive grains fixed to the outer circumferential surface of the grindstone 13 is changed to #60 to 100 that is larger than the grain diameter of the related art. With this, the second processing according to Embodiment is performed so that the ten-point average roughness Rzjis of the vane receiving groove surface 5a of the cylinder 5 is from 5.0 to 6.0 pm. Recessed valley portions (parts recessed from the flat reference position of the vane receiving groove surface 5a) are formed in the vane receiving groove surface 5a of the cylinder 5 processed by the second processing according to Embodiment. [0025]
Fig. 6 illustrates the relationship between the position in the radial direction on the vane receiving groove surface 5a of the cylinder 5 and the surface flatness of the vane receiving groove surface 5a of the cylinder 5. Here, the vane receiving groove

surface 5a of the cylinder 5 is formed by the second processing according to Embodiment. In Fig. 6, Rvk represents the depth of the valley portions (projecting valley portion depth) formed in the vane receiving groove surface 5a of the cylinder 5, and W represents the dimension of the pitch of the vaiiey portions (dimensions between adjacent ridge portions). [0026]
In the vane receiving groove surface 5a of the cylinder 5 processed by the second processing according to Embodiment where the recessed valley portions are formed, the ten-point average roughness Rzjis ts from 5.0 to 6.0 (am, the depth of the valley portions Rvk is from 3.0 to smaller than 5.0 jxm, and pitch W of the valley portions is from 2 to 3 fim. With the above-described valley portions formed in the vane receiving groove surface 5a of the cylinder 5, an oil retaining effect by which the oil entering the gap (clearance) between the vane 9 and the vane receiving groove surface 5a during sliding of the vane 9 is retained can be obtained. This can eliminate the failure in forming an oil film, and accordingly, the sliding property can be improved. As a result, noise and sliding losses can be reduced. [0027]
However, performing the second processing according to Embodiment to have the vane receiving groove surface 5a of the cylinder 5 with the ten-point average roughness Rzjis of 5.0 to 6.0 jim also forms the ridge portions having sharp tips at the same time as the formation of the recessed vaiiey portions in the vane receiving groove surface 5a of the cylinder 5. Accordingly, with the formation of the recessed valley portions, although the sliding property of the vane 9 is improved due to elimination of the failure in forming an oil film, the catching that causes degradation of the sliding property of the vane 9 occurs between the vane 9 and the vane receiving groove surface 5a due to the formation of the ridge portions having sharp tips. Furthermore, the size of the gap (clearance) between the vane 9 and the vane receiving groove surface 5a is increased, thereby, the compressed refrigerant gas leaks. Accordingly, there is a problem in that the leakage of the compressed refrigerant gas leads to the occurrences of leakage losses.

[0028]
Accordingly, after the second processing according to Embodiment, finish processing for the vane receiving groove surface 5a of the cylinder 5 is added for elimination of the sharp tips of the ridge portions of the vane receiving groove surface 5a according to Embodiment. [0029]
Fig. 7 illustrates a second processing member 30 used for the finish processing according to Embodiment of the present invention.
According to Embodiment, the processing apparatus main body (not illustrated) is used for the finish processing in which the vane receiving groove surface 5a of the cylinder 5 is subjected to finishing. The second processing member 30 illustrated in Fig. 8 is secured to a distal end portion of the processing apparatus main body.
The second processing member 30 includes a securing portion 31, a superhard plate 32, and an arm portion 33. The securing portion 31 secures the second processing member 30 to the distal end of the processing apparatus main body. The superhard plate 32 has a thickness that is larger than the width of the vane receiving groove 11. The arm portion 33 holds the superhard plate 32. [0030]
The superhard plate 32 is inserted into the vane receiving groove 11 of the cylinder 5 in a perpendicular direction of the cylinder 5 (direction perpendicular to the page of Fig. 2). Then, the superhard plate 32 is moved outward in the radial direction of the cylinder 5 in the vane receiving groove 11. Although the thickness of the superhard plate 32 is larger than the width of the vane receiving groove 11, the cylinder 5 is distorted due to an external force when the superhard plate 32 is inserted. This increases the size of the vane receiving groove 11. As a result, the superhard plate 32 can be inserted. [0031]
According to Embodiment, the superhard plate 32 having a larger thickness • than the width of the vane receiving groove 11 is used for the finish processing in which the vane receiving groove surface 5a of the cylinder 5 is subjected to finishing.

Accordingly, during the finish processing, the superhard plate 32 is restrained without being distorted. Thus, the tips of the ridge portions of the vane receiving groove surface 5a of the cylinder 5 are equally crushed, thereby the vane receiving groove surface 5a can have a flat shape. [0032]
Although the superhard plate 32 has a larger thickness than the width of the vane receiving groove 11 and is formed of a superhard material according to Embodiment, this is not limiting. It is sufficient that the superhard plate 32 be formed of a harder material than that of the cylinder 5. Furthermore, although the superhard plate 32 is a member having a plate shape according to Embodiment, a member such as a cylindrical member, a plate-shaped member, a cylindrical too! on which an abrasive, abrasive grains, or the like are fixed, or cloth on which abrasive grains are bonded may be used. [0033]
Fig. 8 illustrates the relationship between the position in the radial direction on the vane receiving groove surface 5a of the cylinder 5 and the surface flatness of the vane receiving groove surface 5a of the cylinder 5 after the vane receiving groove surface 5a has undergone the finish processing according to Embodiment. In Fig. 8, Rvk represents the depth of the valley portions (projecting valley portion depth) formed in the vane receiving groove surface 5a of the cylinder 5, and W represents the dimension of the pitch of the valley portions.
As illustrated in Fig. 8, since the tips of the ridge portions of the vane receiving groove surface 5a of the cylinder 5 have been equally crushed, the vane receiving groove surface 5a of the cylinder 5 after the finish processing has a flat shape. Furthermore, the recessed valley portions formed according to Embodiment remain in the vane receiving groove surface 5a of the cylinder 5 after the finish processing. [0034]
Furthermore, as illustrated in Fig. 8, according to Embodiment, in the vane receiving groove surface 5a of the cylinder 5 after the finish processing, the ten-point average roughness Rzjis is from 4.0 to 5.0 j-im, Rvk representing the depth of the

valley portions (projecting valley portion depth) is from 3.0 to smaller than 5.0 ^m, and the Rpk representing the surface flatness (projecting ridge portion height) is 0.2 fim or smaller. With the vane receiving groove surface 5a of the cylinder 5 having a shape that satisfies the above description, in addition to obtaining the oil retaining effect, the catching occurring between the vane 9 and the vane receiving groove surface 5a can be suppressed. Thus, frictional resistance can be reduced, and accordingly, the sliding property of the vane 9 can be improved. [0035]
Fig. 9 illustrates the relationships between elapsed testing time and the coefficient of friction of the vane receiving groove surface 5a of the cylinder 5 formed by the processing method according to Embodiment of the present invention and the related-art processing method. The horizontal axis represents the elapsed testing time, and the vertical axis represents the coefficient of friction.
As illustrated in Fig. 9, an average of the coefficient of sliding friction jj.b, against the vane 9, of the vane receiving groove surface 5a of the cylinder 5 formed by the related-art processing method is \xb = 0.14, and an average of the coefficient of sliding friction jia of the recessed vane receiving groove surface 5a of the cylinder 5 formed by the processing method according to Embodiment is jaa = 0.115. Thus, compared to the related art, reduction of the coefficient of friction is given by \±a - \xb -0.035, that is, the frictional resistance can be reduced according to Embodiment. [0036]
Fig. 10 is a graph illustrating the relationship between the coefficient of friction and the depth of the valley portions of the vane receiving groove 11 according to Embodiment of the present invention.
From the relationship between the coefficient of friction and the depth of the valley portions of the vane receiving groove surface 5a according to Embodiment, the coefficient of friction corresponding to the depth of the valley portions Rvk (projecting valley portion depth) from 3.0 to 5.0 |im in a range according to Embodiment is smaller than the coefficient of friction corresponding to the depth of the valley portions

Rvk (projecting valley portion depth) from 0.0 to smaller than 3.0 ^m in a range of the
related-art.
[0037]
Accordingly, with the surface shape of the vane receiving groove surface 5a according to Embodiment having the valley portions the depth of which is from 3.0 to * smaller than 5.0 jam, the frictional resistance can be reduced compared to that of the related art. Since the coefficient of friction increases when the depth of valley portions is 5.0 ^m or larger, the depth of the valley portions is set to be smaller than 5.0 i^m. [0038]
With the processing method according to Embodiment, the tips of the ridge portions of the vane receiving groove surface 5a of the cylinder 5 are equally crushed so as to form flat shapes. Thus, when the vane 9 reciprocates in the vane receiving groove 11, the vane 9 can slide without being caught by the ridge portions of the vane receiving groove surface 5a the cylinder 5. [0039]
Furthermore, the recessed valley portions remain in the vane receiving groove surface 5a. Accordingly, the oil easily enters the gap (clearance) between the vane 9 and the vane receiving groove surface 5a of the cylinder 5, the oil retaining effect can be expected, and the effect of reducing the frictional resistance is obtained. This improves the sliding property of the vane 9 and can suppress input to the compressor. [0040]
Furthermore, degradation of the sliding property of the vane 9 due to lack of the oil in the gap (clearance) between the vane 9 and the vane receiving groove surface 5a of the cylinder 5 can be prevented in advance. Accordingly, noise generated during operation of the rotary compressor 1 can be reduced. [0041]
Furthermore, when the vane receiving groove surface 5a of the cylinder 5 is finished with high precision as is the case with Embodiment, the flatness of the vane receiving groove surface 5a is improved. This can suppress leakage Josses through

the gap (clearance) between the vane 9 and the vane receiving groove surface 5a of
the cylinder 5. Thus, high performance can be obtained.
[0042]
Furthermore, although the present invention is applied to the rotary compressor
I of the single cylinder type according to Embodiment, It is also effective to apply the
present invention to a multi-stage rotary compressor of an internal intermediate
pressure type.
Reference Signs List [0043]
1 rotary compressor 2 sealed container 3 rotational shaft 4 rotary compression mechanical unit 5 cylinder 5a vane receiving groove surface 6 eccentric ring 7 lower cover 8 eccentric portion 9 vane 10 upper cover
II vane receiving groove 12 electrical drive element 13 grindstone 14
securing portion 15 arm portion 16 belt 17 bearing 18 grindstone shaft
20 first processing member 30 second processing member 31 securing
portion 32 superhard plate 33 arm portion

CLAIMS [Claim 1]
A rotary compressor comprising:
a sealed container; and
a rotary compression mechanical unit provided in the sealed container and configured to compress refrigerant,
wherein the rotary compression mechanical unit includes
a cylinder having a vane receiving groove extending from an inner circumferential surface toward an outer circumference surface, and
a vane disposed in the vane receiving groove and configured to slide along a vane receiving groove surface defining the vane receiving groove,
wherein a recessed valley portion is formed in a vane receiving groove surface, and a pitch W of the valley portion is from 2 to 3 fim, and
wherein, in the vane receiving groove surface, a projecting valley portion depth Rvk is from 3.0 to smaller than 5.0 (,im. [Claim 2]
The rotary compressor of claim 1,
wherein, in a vane receiving groove surface, a ten-point average roughness Rzjis is from 4.0 to 5.0 \im, and a projecting ridge portion height Rpk is smaller than 0.2 nm. [Claim 3]
A method of manufacturing a rotary compressor including a sealed container and a rotary compression mechanical unit provided in the sealed container and configured to compress refrigerant, and the rotary compression mechanical unit includes a cylinder having a vane receiving groove extending from an inner circumferential surface toward an outer circumference surface and a vane disposed in the vane receiving groove and configured to slide along a vane receiving groove surface defining the vane receiving groove, the method comprising:

inserting into the vane receiving groove a grindstone having an outer circumferential surface to which an abrasive grain having a grain diameter of #60 to #100 is fixed; and
grinding the vane receiving groove surface of the cylinder by using an outer circumferential surface of the grindstone to which the abrasive grain is fixed;. [Claim 4]
The method of manufacturing the rotary compressor of claim 3, further comprising
forming a flat shape by, after inserting and grinding, crushing a tip of a ridge portion formed on the vane receiving groove surface,
wherein the crushing is performed with a member that is formed of a harder material than a material of the cylinder and that has a larger thickness than a width of the vane receiving groove.