Claw compressor and method for assembling the same

Abstract

To reduce a manufacturing cost of a claw compressor.SOLUTION: A claw compressor 1 comprises: a housing 6 forming an outer shell; a male rotor 24 provided with a claw part protruding in a radial direction; a first rotating shaft 32 for rotating and supporting the male rotor 24; a first bolt fastening part for fastening the male rotor 24 to a shaft end on one side of the first rotating shaft 32 by a first bolt 31; a female rotor 26 to be rotated in a direction opposite to that of the male rotor 24, and comprising a concave part for receiving the claw part at the time of a compression process; a second rotating shaft 42 for rotating and supporting the female rotor 26; a second bolt fastening part for fastening the female rotor 26 to a shaft end on one side of the second rotating shaft 42 by a second bolt 41; a gear part 5 connecting the first rotating shaft 32 and the second rotating shaft 42; and a driving part connected to one of the first rotating shaft 32 and the second rotating shaft 42. A shaft end on the other side of the other of first rotating shaft 32 and the second rotating shaft 42 is provided outside the housing 6.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a claw compressor and a method for assembling the same. [Background technology]

[0002] A claw compressor includes a pair of rotors with hook-shaped claws formed inside a housing that forms a compression chamber. The pair of rotors are connected via a timing gear. The rotors rotate at the same speed in opposite directions without contact while maintaining a predetermined clearance, forming a compression pocket between the two rotors, and discharging a fluid compressed in the compression pocket. Such claw compressors are often used mainly as vacuum pumps and blowers (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6845596 Summary of the Invention [Problem to be solved by the invention]

[0004] When using a steam generating heat pump as an alternative to a boiler to compress the generated steam, the compressor needs to have a larger capacity than a vacuum pump or a blower. In order to increase the capacity of a claw compressor, a large rotor is fixed to the shaft. The rotor is fixed to the shaft by tightening a bolt that passes through the rotor against the tip of the shaft. Therefore, when fixing a large rotor to the shaft, the fastening force of the bolt against the shaft becomes large.

[0005] A pair of rotors provided in the claw compressor are each connected to a shaft. Therefore, the claw compressor has two shafts. In the following description, the shaft directly connected to the motor is referred to as the "drive shaft", and the shaft connected to the drive shaft via a timing gear is referred to as the "driven shaft". Of the two shafts, the drive shaft protrudes outside the housing because it needs to be connected to the motor. For this reason, it is considered to fix the other end of the drive shaft when tightening the bolt to the shaft. However, if the other end of the drive shaft is fixed when tightening the rotor to the driven shaft, the tightening torque is transmitted to the drive shaft via the timing gear, which may damage the timing gear.

[0006] In addition, the tightening torque is extremely large compared to the torque required for compressing gas, so if the gears are selected based on the tightening torque, it will be necessary to select gears with stiffness several times higher than that required for normal operation of compressing gas, which may result in higher costs compared to selecting gears based on normal operation.

[0007] The present disclosure has been made in consideration of the above circumstances, and has an object to provide a claw compressor and an assembly method thereof that can reduce manufacturing costs. Another object of the present invention is to provide a claw compressor and an assembly method thereof that can improve assembly efficiency. [Means for solving the problem]

[0008] In order to solve the above problems, the claw compressor and the assembly method thereof of the present disclosure employ the following measures. A claw compressor according to one aspect of the present disclosure includes a housing forming an outer shell, a first rotor provided with claw portions protruding in a radial direction, a first rotating shaft that rotatably supports the first rotor, a first bolt fastening portion that fastens the first rotor to one axial end of the first rotating shaft with a bolt, a second rotor that rotates in a direction opposite to that of the first rotor and has recesses that receive the claw portions during a compression process, a second rotating shaft that rotatably supports the second rotor, a second bolt fastening portion that fastens the second rotor to one axial end of the second rotating shaft with a bolt, a compression chamber that accommodates the first rotor and the second rotor, a connection portion that connects the first rotating shaft and the second rotating shaft, and a drive portion that connects to one of the first rotating shaft or the second rotating shaft. The other shaft end of the first rotating shaft or the second rotating shaft is provided outside the housing.

[0009] A method for assembling a claw compressor according to one embodiment of the present disclosure is a method for manufacturing a claw compressor including a housing forming an outer shell, a first rotor provided with radially protruding claw portions, a first rotating shaft that rotatably supports the first rotor, a first bolt fastening portion that fastens the first rotor to one side of an axial end of the first rotating shaft with a bolt, a second rotor that rotates in the opposite direction to the first rotor and has a recess that receives the claw portions during a compression process, a second rotating shaft that rotatably supports the second rotor, a second bolt fastening portion that fastens the second rotor to one side of an axial end of the second rotating shaft with a bolt, a compression chamber that accommodates the first rotor and the second rotor, a connection portion that connects the first rotating shaft and the second rotating shaft, and a drive portion that connects to one of the first rotating shaft or the second rotating shaft, wherein the other axial end of the other of the first rotating shaft or the second rotating shaft is provided outside the housing, and the method includes a step of fixing the rotor with the other axial end fixed to the bolt fastening portion of the other rotating shaft. Effect of the Invention

[0010] According to the present disclosure, it is possible to reduce the manufacturing cost of the claw compressor and improve the ease of assembly of the claw compressor. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing a claw compressor according to a first embodiment of the present disclosure. [Diagram 2] FIG. 2 is a cross-sectional view of the claw compressor taken along line II-II of FIG. 1. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 3 is a cross-sectional view corresponding to FIG. 2, showing a claw compressor according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. [First embodiment] The first embodiment of the present disclosure will be described below. The claw compressor 1 according to this embodiment is used for compressing steam. As shown in Fig. 1, the claw compressor 1 includes a housing 6 forming an outer shell, a compression section 3 having a compression chamber 20 formed therein, and a gear section (connection section) 5 housing a timing gear. The housing 6 has a first housing 7 , a second housing 9 and a third housing 11 . The compression section 3 is formed by a first housing 7 and a second housing 9, and the gear section 5 is formed by the second housing 9 and a third housing 11. The claw compressor 1 is mounted upright on an installation surface by means of, for example, four legs 12.

[0013] The compression section 3 has an intake port 13 for drawing in steam (fluid) and an exhaust port 15 for discharging the steam after compression. The steam is, for example, water vapor. The drawn steam may be under negative pressure or positive pressure.

[0014] 2, the compression section 3 is configured such that a compression chamber 20 is formed inside by covering a recess formed in the front end (one side end) of the second housing 9 with the first housing 7. The first housing 7 is airtightly attached to the second housing 9 via an O-ring 22.

[0015] The compression chamber 20 is provided with a pair of rotors, namely a male rotor (first rotor) 24 and a female rotor (second rotor) 26.

[0016] As shown in Fig. 3, the male rotor 24 has a pair of hook-shaped claws 24a. The claws 24a are provided symmetrically about the first rotation axis O1. The male rotor 24 rotates counterclockwise (in the direction of arrow A1) in Fig. 3.

[0017] The female rotor 26 has a pair of hook-shaped claws 26a. The claws 26a are provided symmetrically about the second rotation axis O2. The female rotor 26 rotates clockwise (in the direction of arrow A2) in FIG.

[0018] The claws 24a of the male rotor 24 and the claws 26a of the female rotor 26 are adapted to mesh with each other without contacting each other. The female rotor 26 is formed with a recess 26b that receives the claws 24a of the male rotor 24 during the compression process. The compressed steam is discharged from the discharge port 15, which is substantially triangular in shape in FIG. 3.

[0019] 3, the shape of the compression chamber 20 is determined by the inner wall 9a of the second housing 9, and has a cross-sectional shape in which two circles, a circle centered on the first rotational axis O1 and a circle centered on the second rotational axis O2, are partially overlapped. The tips of the claws 24a, 26a of the rotors 24, 26 run along the inner wall 9a of the second housing 9 with a predetermined clearance.

[0020] As shown in Fig. 2, the male rotor 24 is fastened to the first rotating shaft 32 by a first bolt 31. Specifically, as shown in Fig. 2, the first bolt 31 is screwed onto the first rotating shaft 32 with the axis of the first bolt 31 coinciding with the first rotation axis O1. A fastening structure (first bolt fastening portion) is configured with the center of the male rotor 24 sandwiched between the tip surface of the first rotating shaft 32 and the head of the first bolt 31. The head of the first bolt 31 is housed in a cylindrical recess 24c formed in the center of the male rotor 24.

[0021] The female rotor 26 is fastened to the second rotating shaft 42 by the second bolt 41. Specifically, the second bolt 41 is screwed into the second rotating shaft 42 with the axis of the second bolt 41 coinciding with the second rotating axis O2. The second rotating shaft 42 is provided parallel to the first rotating shaft 32. That is, the first rotating axis O1 and the second rotating axis O2 are parallel to each other.

[0022] A fastening structure (second bolt fastening portion) is configured with the center portion of the female rotor 26 sandwiched between the tip surface of the second rotating shaft 42 and the head of the second bolt 41. The head of the second bolt 41 is housed in a cylindrical recess 26c formed in the center of the female rotor 26. Therefore, before the female rotor 26 is fixed by the second bolt 41, relative rotation between the female rotor 26 and the second rotating shaft 42 is permitted.

[0023] The first rotating shaft 32 supporting the male rotor 24 has a tip located in the compression chamber 20 and a rear end connected to a drive unit (not shown). For example, an electric motor is used as the drive unit. The first rotating shaft 32 rotates around a first rotation axis O1, whereby the male rotor 24 rotates in the compression chamber 20. The first rotating shaft 32 is rotatably supported at two points, a tip bearing 37 and a rear bearing 38. The tip bearing 37 is provided in the second housing 9, and for example, a double-row ball bearing is used. However, the tip bearing 37 is not limited to a double-row or ball bearing. The rear bearing 38 is located rearward of the tip bearing 37 and provided in the third housing 11. The rear bearing 38 is a single-row ball bearing, but is not limited to a single-row or ball bearing.

[0024] A first timing gear 39 is fixed to the first rotating shaft 32 between the front end bearing 47 and the rear end bearing 38. The first timing gear 39 is, for example, a spur gear, and rotates around the first rotation axis O1 together with the first rotating shaft 32. The first rotating shaft 32 is connected to the second rotating shaft 42 via a gear portion 5.

[0025] The first timing gear 39 is provided in the gear portion 5, and is accommodated in a gear chamber 21 formed between the rear end (the other end) of the second housing 9 and the front end of the third housing 11. The second housing 9 and the third housing 11 are attached liquid-tightly via an O-ring 23 so as to seal in the lubricating oil in the gear chamber 21. The interior of the gear chamber 21 (that is, the interior of the third housing 11) is an oil atmosphere, which lubricates the gear portion 5.

[0026] As described above, the tip end (one shaft end) of the first rotating shaft 32 is provided with a first bolt fastening portion to which the first bolt 31 is fastened. In addition, the rear end (the other shaft end) of the first rotating shaft 32 protrudes from the housing 6. Specifically, the rear end of the second rotating shaft 42 protrudes from the third housing 11. In other words, the rear end of the second rotating shaft 42 is provided outside the third housing 11. The rear end of the first rotating shaft 32 is connected to a drive unit (such as an electric motor).

[0027] The second rotating shaft 42 supporting the female rotor 26 has a tip located within the compression chamber 20 and a rear end protruding from the third housing 11. A space S for accommodating a rear end bearing 48 is formed in the third housing 11. The rear end bearing 48 is lubricated with grease.

[0028] The second rotating shaft 42 rotates around the second rotation axis O2, whereby the female rotor 26 rotates in the compression chamber 20. The second rotating shaft 42 is rotatably supported at two locations, a front end bearing 47 and a rear end bearing (bearing) 48. The front end bearing 47 is provided in the second housing 9, and is, for example, a double row ball bearing. However, the front end bearing 47 is not limited to a double row or ball bearing. The rear end bearing 48 is located on the rear end side of the front end bearing 47 and is provided outside the third housing 11. Specifically, the rear end bearing 48 is provided in a space S adjacent to the gear chamber 21. The rear end bearing 48 is a single row ball bearing, but is not limited to a single row or ball bearing.

[0029] A second timing gear 49 is fixed to the second rotating shaft 42 between the front end bearing 47 and the rear end bearing 48. The second timing gear 49 is, for example, a spur gear, and rotates together with the second rotating shaft 42 about the second rotation axis O2.

[0030] The second timing gear 49 is provided in the gear portion 5 and housed in the gear chamber 21. The second timing gear 49 meshes with the first timing gear 39, and receives a driving force from the first timing gear 39. Therefore, the first rotating shaft 32 serves as a driving shaft, and the second rotating shaft 42 serves as a driven shaft.

[0031] As described above, the tip (one side shaft end) of the second rotating shaft 42 is provided with a second bolt fastening portion to which the second bolt 41 is fastened. The rear end (other side shaft end) of the second rotating shaft 42 protrudes from the housing 6. Specifically, the rear end of the second rotating shaft 42 protrudes from the third housing 11. That is, the rear end of the second rotating shaft 42 is provided outside the third housing 11. The rear end of the second rotating shaft 42 is located in a space formed between the third housing 11 and a drive unit (such as an electric motor). A double nut 50 is fitted to the rear end of the second rotating shaft 42. The double nut 50 has two nuts 50a that are aligned in the axial direction and each of which is fitted to the second rotating shaft. As will be described later, the double nut 50 is used when fastening the female rotor 26 to the second bolt fastening portion of the second rotating shaft 42. The double nut 50 may be removed after the female rotor 26 is fastened.

[0032] The claw compressor 1 having the above configuration operates as follows. The first rotating shaft 32 is rotationally driven by a drive unit (not shown), and the male rotor 24 rotates in the compression chamber 20. The second rotating shaft 42 is rotated by the second timing gear 49 to which a rotational drive force is transmitted from the first timing gear 39, which rotates together with the first rotating shaft 32, and the female rotor 26 rotates in the compression chamber 20.

[0033] The male rotor 24 and the female rotor 26 rotate in the compression chamber 20, and steam is sucked in from the suction port 13. The male rotor 24 rotates counterclockwise (in the direction of the arrow A1) in FIG. 3, and takes in steam into the compression pocket formed by the claws 24a, and moves it downward along the outer periphery of the compression chamber 20. The female rotor 26 rotates clockwise (in the direction of the arrow A2) in FIG. 3, and takes in steam into the compression pocket formed by the claws 26a, and moves it downward along the outer periphery of the compression chamber 20. The compression pocket formed by the male rotor 24 and the compression pocket formed by the female rotor 26 join together at the center of the lower part of the compression chamber 20, and in the resulting combined compression pocket, the claws 24a of the male rotor 24 enter the recesses 26b of the female rotor 26 to compress the steam. The compressed steam is discharged from the discharge port 15 to the outside.

[0034] When assembling the claw compressor 1, the attachment of the third housing 11 and the fastening of the female rotor 26 to the second bolt fastening portion of the second rotating shaft 42 are performed as follows.

[0035] When attaching the third housing 11, the second rotating shaft 42 is inserted through the third housing 11 with the rear end bearing 48 attached. The inner diameter of the rear end bearing 48 is set to be loose with respect to the outer diameter of the second rotating shaft 42.

[0036] When fastening the female rotor 26 to the second rotating shaft 42 using the second bolt 41, first, the double nut 50 is fitted to the rear end of the second rotating shaft 42. Next, with the double nut 50 fixed with a fixing jig, the second bolt 41 is rotated and screwed into the second bolt fastening portion of the second rotating shaft 42 (see arrow A4 in FIG. 2). In this manner, the second rotating shaft 42 is prevented from co-rotating when the second bolt 41 is screwed.

[0037] According to this embodiment, the following advantageous effects are obtained. In this embodiment, the rear end of the second rotating shaft 42 is provided outside the housing 6. This makes it easier to access the rear end of the second rotating shaft 42. Therefore, when the female rotor 26 is fastened to the bolt fastening portion of the second rotating shaft 42 by the second bolt 41, the rear end of the second rotating shaft 42 can be fixed with the double nut 50. Therefore, when the female rotor 26 is fastened to the second rotating shaft 42, torque is transmitted without passing through the gear portion 5, as shown by the arrow A3 in FIG. 2. This makes it possible to reduce the load acting on the gear portion 5. This makes it possible to make the gear portion 5 less likely to be damaged. In addition, since the material for the connection portion can be selected based on normal operation (operation in which the fluid is compressed in the compression chamber 20), it is possible to select a material for the connection portion having low rigidity, thereby reducing costs.

[0038] Moreover, the space in which the rear end of the second rotating shaft 42 is located is the space formed between the drive unit and the third housing 11. In this way, since the rear end of the second rotating shaft 42 is located in the space that is inevitably formed when connecting the claw compressor 1 and the drive unit, it is not necessary to form a new space to provide the double nut 50. Therefore, it is possible to prevent the claw compressor 1 from becoming large.

[0039] Furthermore, in an oil atmosphere, grease will dissolve into the oil, but in this embodiment, the rear end bearing 48 is provided outside the housing 6. This allows the rear end bearing 48 to be lubricated with grease. This allows the structure to be simplified compared to, for example, a case in which an oil groove or the like is formed to supply lubricating oil to the rear end bearing 48. Therefore, the manufacturing cost of the claw compressor 1 can be reduced.

[0040] In addition, since the rear end bearing 48 is provided outside the housing 6, when the rear end bearing 48 is inserted into the second rotating shaft 42, the second rotating shaft 42 can be inserted while checking the second rotating shaft 42 from the axial direction. This improves the ease of assembly of the claw compressor 1.

[0041] [Second embodiment] Next, a second embodiment of the present disclosure will be described with reference to FIG. This embodiment differs from the first embodiment in that a rear end bearing 48 is provided inside the housing 6 (more specifically, the third housing 11). Since the other structures are similar to those of the first embodiment, the same structures are denoted by the same reference numerals and detailed descriptions thereof will be omitted.

[0042] In this embodiment, a rear end cover 44 is provided on the third housing 11 and closes the rear end of the second rotating shaft 42. A space is formed inside the rear end cover 44. The rear end of the second rotating shaft 42 is disposed in the space formed inside the rear end cover 44. The space S in which the rear end bearing 48 is provided is made part of the gear chamber 21. That is, the rear end bearing 48 is provided in the gear chamber 21. The rear end bearing 48 is lubricated by oil filling the gear chamber 21. The rear end cover 44 is fixed liquid-tightly to the third housing 11 via an O-ring (not shown).

[0043] According to this embodiment, the following advantageous effects are obtained. In this embodiment, the rear end bearing 48 is provided inside the housing 6. This allows the area between the rear end bearing 48 and the second rotating shaft 42 to be lubricated with oil. This makes it possible to suppress wear due to creep. This makes it possible to suppress damage to the rear end bearing 48.

[0044] The present disclosure is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit and scope of the present disclosure. For example, in each of the above-described embodiments, the male rotor 24 is the driving side and the female rotor 26 is the driven side, but the male rotor 24 may be the driven side and the female rotor 26 may be the driving side.

[0045] The claw compressor and the assembly method thereof according to the above-described embodiment can be understood, for example, as follows. A claw compressor according to a first aspect of the present disclosure includes a housing (6) forming an outer shell, a first rotor (24) provided with claw portions (24a) protruding in a radial direction, a first rotating shaft (32) that rotatably supports the first rotor, a first bolt fastening portion that fastens the first rotor to one end of the first rotating shaft with a bolt (31), a second rotor (26) that rotates in the opposite direction to the first rotor and has recesses (26b) that receive the claw portions during a compression stroke, and a second rotor (26) that supports the first rotor. the housing includes a second rotating shaft (42) that rotatably supports a rotor, a second bolt fastening portion that fastens the second rotor to one axial end of the second rotating shaft with a bolt (41), a compression chamber (20) that accommodates the first rotor and the second rotor, a connection portion (5) that connects the first rotating shaft and the second rotating shaft, and a drive portion that connects to either the first rotating shaft or the second rotating shaft, and the other axial end of the other of the first rotating shaft or the second rotating shaft is provided outside the housing.

[0046] In the above configuration, the other shaft end of the other of the first rotating shaft or the second rotating shaft (i.e., the rotating shaft not connected to the drive unit (hereinafter referred to as the "driven shaft")) is provided outside the housing. This makes it possible to easily access the other shaft end of the driven shaft (i.e., the shaft end not provided with the bolt fastening portion). Therefore, when fastening the loader to the bolt fastening portion of the driven shaft with a bolt, the other shaft end of the driven shaft can be fixed with a fixing device (e.g., a double nut, etc.). This makes it possible to reduce the load acting on the connection portion when fastening the rotor to the driven shaft. This makes it possible to make the connection portion less susceptible to damage. In addition, since the material for the connection part can be selected based on normal operation (operation in which the fluid is compressed in the compression chamber), it is possible to select a material for the connection part with low rigidity, thereby reducing costs.

[0047] In addition, the claw compressor according to a second aspect of the present disclosure is the claw compressor of the first aspect described above, further comprising a bearing (48) that rotatably supports the first rotating shaft and / or the second rotating shaft, the inside of the housing is an oil atmosphere, and the bearing is provided inside the housing.

[0048] In the above configuration, the bearings are provided inside the housing. This allows the first rotating shaft and / or the second rotating shaft to be lubricated with oil between the bearings and the first rotating shaft and / or the second rotating shaft. This makes it possible to suppress wear caused by creep, and therefore to suppress damage to the bearings.

[0049] In addition, the claw compressor according to a third aspect of the present disclosure is the same as in the first aspect, except that it further includes a bearing (48) that rotatably supports the first rotating shaft and / or the second rotating shaft, the bearing being provided outside the housing, and the bearing being lubricated with grease.

[0050] In an oil atmosphere, grease will dissolve into the oil, but in the above configuration, the bearing is provided outside the housing, so the bearing can be lubricated with grease. This simplifies the structure compared to, for example, a case in which an oil groove is formed to supply lubricating oil to the bearing. This allows the manufacturing cost of the claw compressor to be reduced. In addition, since the bearing is provided outside the housing, when the bearing is inserted into the first rotating shaft and / or the second rotating shaft, the first rotating shaft and / or the second rotating shaft can be inserted while checking the first rotating shaft and / or the second rotating shaft from the axial direction, thereby improving the assembly ability of the claw compressor.

[0051] Also, a method of assembling a claw compressor according to a first aspect of the present disclosure includes: a housing (6) forming an outer shell; a first rotor (24) provided with claw portions (24a) protruding in a radial direction; a first rotating shaft (32) that rotatably supports the first rotor; a first bolt fastening portion that fastens the first rotor to one shaft end of the first rotating shaft with a bolt (31); a second rotor (26) that rotates in a direction opposite to that of the first rotor and has recesses (26b) that receive the claw portions during a compression stroke; a second rotating shaft (42) that rotatably supports the second rotor; a second bolt fastening portion fastened to one axial end of a first rotor by a bolt (41), a compression chamber (20) accommodating the first rotor and the second rotor, a connection portion (5) connecting the first rotating shaft and the second rotating shaft, and a drive portion connected to one of the first rotating shaft or the second rotating shaft, wherein the other axial end of the other of the first rotating shaft or the second rotating shaft is provided outside the housing, and the method includes a step of fixing a rotor with the other axial end fixed to the bolt fastening portion of the other rotating shaft. [Explanation of symbols]

[0052] 1: Claw compressor 3: Compression section 5: Gear section (connection section) 6: Housing 7: 1st housing 9: Second housing 9a:Inner wall 11: 3rd housing 12: Legs 13: Intake port 15:Discharge port 20: Compression chamber 21: Gear room 22: O-ring 23: O-ring 24: Osrotor (first rotor) 24a: Claw part 24c: recess 26: Female rotor (second rotor) 26a: Claw part 26b: Recess 26c: recess 31: First bolt 32: First rotation axis 37: Tip bearing 38: Rear end bearing 39: 1st timing gear 41: Second bolt 42: Second rotation axis 44: Rear end cover 47: Tip bearing 48: Rear end bearing 49: Second timing gear 50: Double nut 50a: Nut O1: First rotation axis O2: Second rotation axis S: Space

Claims

1. A housing forming an outer shell; a first rotor provided with claws protruding in a radial direction; a first rotating shaft that rotatably supports the first rotor; a first bolt fastening portion that fastens the first rotor to one end of the first rotating shaft with a bolt; a second rotor that rotates in a direction opposite to that of the first rotor and has a recess that receives the claw portion during a compression stroke; a second rotating shaft that rotatably supports the second rotor; a second bolt fastening portion that fastens the second rotor to one shaft end of the second rotating shaft with a bolt; a compression chamber that accommodates the first rotor and the second rotor; a connection portion that connects the first rotating shaft and the second rotating shaft; A drive unit connected to one of the first rotating shaft and the second rotating shaft; Equipped with A claw compressor, wherein the other shaft end of the first rotating shaft or the second rotating shaft is provided outside the housing.

2. a bearing that rotatably supports the first rotating shaft and / or the second rotating shaft, The inside of the housing is in an oil atmosphere, 2. The claw compressor according to claim 1, wherein the bearing is provided inside the housing.

3. a bearing that rotatably supports the first rotating shaft and / or the second rotating shaft, The bearing is provided outside the housing, 2. The claw compressor of claim 1, wherein said bearings are lubricated with grease.

4. A housing forming an outer shell; a first rotor provided with claws protruding in a radial direction; a first rotating shaft that rotatably supports the first rotor; a first bolt fastening portion that fastens the first rotor to one end of the first rotating shaft with a bolt; a second rotor that rotates in a direction opposite to that of the first rotor and has a recess that receives the claw portion during a compression stroke; a second rotating shaft that rotatably supports the second rotor; a second bolt fastening portion that fastens the second rotor to one shaft end of the second rotating shaft with a bolt; a compression chamber that accommodates the first rotor and the second rotor; a connection portion that connects the first rotating shaft and the second rotating shaft; A drive unit connected to one of the first rotating shaft and the second rotating shaft; A method for manufacturing a claw compressor comprising: the other end of the first rotating shaft or the second rotating shaft is provided outside the housing, A method for assembling a claw compressor comprising the step of fixing a rotor to a bolt fastening portion of the other rotating shaft while the other shaft end is fixed.

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