Co-rotating scroll compressor

Abstract

The present invention provides a co-rotating scroll compressor that can inhibit leakage of lubricant supplied to a synchronous drive mechanism. A co-rotating scroll compressor includes a drive-side plate 20 placed between a driving scroll member 70 and a motor 5 at a predetermined distance from the driving scroll member 70 in a direction of a drive-side rotation axis CL1. The drive-side plate 20 includes a shaft portion 20b fixed to a driving shaft 6 of the motor 5 and a fixing portion 20a fixed to an outer periphery of the driving scroll member 70, and a synchronous drive mechanism made up of a needle bearing 32a and a pin 32b is placed between the drive-side plate 20 and driving scroll member 70.

Claims

1. A co-rotating scroll compressor comprising: a driving scroll member rotationally driven around a rotation axis by a drive unit and provided with a drive-side wall placed on a drive-side end plate, where the drive-side wall is spiral-shaped; a driven scroll member configured to form a compression space when a driven-side wall corresponding to the drive-side wall is placed on a driven-side end plate and the driven-side wall is meshed with the drive-side wall, where the driven-side wall is spiral-shaped; a synchronous drive mechanism, including a ring and a pin that engages the ring, configured to transmit a driving force from a driving shaft to a driven shaft such that the driving scroll member and the driven scroll member perform rotating motion in a same direction at a same angular velocity; a drive-side plate placed between the driving scroll member and the drive unit at a predetermined distance from the driving scroll member in a direction of the rotation axis, wherein the drive-side plate includes a shaft portion connected to the driving shaft and a fixing portion fixed to an outer periphery of the driving scroll member, and the synchronous drive mechanism is placed between the drive-side plate and the driving scroll member.

2. The co-rotating scroll compressor according to claim 1, further comprising: a driven-side housing section connected to the driven scroll member, placed between the driving scroll member and the drive-side plate, and configured to house the synchronous drive mechanism in an internal space.

3. The co-rotating scroll compressor according to claim 2, wherein the driven-side housing section includes a first side plate connected to the driven-side end plate, and a second side plate configured to form the internal space in conjunction with the first side plate.

4. The co-rotating scroll compressor according to claim 3, wherein: the driven-side housing section includes a plurality of shaft segments divided around a driven-side rotation axis and configured to extend in a direction of the driven-side rotation axis along which the driven scroll member rotates; and a plurality of through-holes corresponding to the plurality of shaft segments are formed in the drive-side plate to pass the respective shaft segments therethrough.

5. The co-rotating scroll compressor according to claim 2, wherein the driven-side housing section includes the driven-side end plate, and a second side plate configured to form the internal space in conjunction with the driven-side end plate.

6. The co-rotating scroll compressor according to claim 5, wherein: the driven-side housing section includes a plurality of shaft segments divided around a driven-side rotation axis and configured to extend in a direction of the driven-side rotation axis along which the driven scroll member rotates; and a plurality of through-holes corresponding to the shaft segments are formed in the drive-side plate to pass the respective shaft segments therethrough.

7. The co-rotating scroll compressor according to claim 2, wherein: the driven-side housing section includes a plurality of shaft segments divided around a driven-side rotation axis and configured to extend in a direction of the driven-side rotation axis along which the driven scroll member rotates; and a plurality of through-holes corresponding to the plurality of shaft segments are formed in the drive-side plate to pass the respective shaft segments therethrough.

8. The co-rotating scroll compressor according to claim 4, further comprising: an insertion member inserted in a space between circumferentially adjacent ones of the plurality of shaft segments.

9. The co-rotating scroll compressor according to claim 2, wherein: the driven-side housing section includes a cylindrical shaft portion shaped like a cylinder and configured to extend in a direction of a driven-side rotation axis along which the driven scroll member rotates; and a cylindrical shaft portion fixing portion located on an outer peripheral side of the drive-side plate and configured to connect between the cylindrical shaft portion and the driven-side housing section.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a longitudinal sectional view showing a co-rotating scroll compressor according to a first embodiment of the present invention.

(2) FIG. 2 is a plan view showing a drive-side plate.

(3) FIG. 3 is a plan view showing a first drive-side wall of FIG. 1.

(4) FIG. 4 is a plan view showing a first driven-side wall of FIG. 1.

(5) FIG. 5 is a plan view showing a second side plate.

(6) FIG. 6 is a plan view showing the drive-side plate and second side plate.

(7) FIG. 7 is a partially enlarged plan view showing a shaft segment configured to perform a relative movement in a through-hole formed in the drive-side plate.

(8) FIG. 8 is a longitudinal sectional view showing a co-rotating scroll compressor according to a modification.

(9) FIG. 9 is a longitudinal sectional view showing a co-rotating scroll compressor according to a second embodiment of the present invention.

(10) FIG. 10A is a perspective view showing shaft segments and an insertion member.

(11) FIG. 10B is a perspective view showing how the insertion member is fitted in the shaft segments.

DESCRIPTION OF EMBODIMENTS

(12) Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment

(13) A first embodiment of the present invention will be described below with reference to FIG. 1 and the like.

(14) A co-rotating scroll compressor 1A is shown in FIG. 1. The co-rotating scroll compressor 1A can be used, for example, as a supercharger configured to compress combustion air (fluid) to be supplied to an internal combustion engine such as a vehicle engine, a compressor used to supply compressed air to electrodes of fuel cells, or a compressor used to supply compressed air used for a braking device of a railroad vehicle or other kinds of vehicles.

(15) The co-rotating scroll compressor 1A includes a housing 3, a motor (drive unit) 5 housed on one end side of the housing 3, and a driving scroll member 70 and driven scroll member 90 housed on another end side of the housing 3.

(16) The housing 3 has a substantially cylindrical shape and includes a motor housing section 3a configured to house the motor 5 and a scroll housing section 3b configured to house the scroll members 70 and 90.

(17) A discharge orifice 3d used to discharge air after compression is formed in an end portion of the scroll housing section 3b. Note that although not illustrated in FIG. 1, the housing 3 is provided with an air inlet port used to suck air.

(18) The motor 5 is driven by being supplied with electric power from a non-illustrated power supply source. Rotation control of the motor 5 is performed on instructions from a non-illustrated control unit.

(19) A stator 5a of the motor 5 is fixed to an inner peripheral side of the housing 3. A rotor 5b of the motor 5 rotates around a drive-side rotation axis CL1.

(20) The rotor 5b is connected with a driving shaft 6 extending on the drive-side rotation axis CL1. A front end (left end in FIG. 1) of the driving shaft 6 is connected with a connecting shaft portion 7a provided on a center plate 7. The central axis of the connecting shaft portion 7a coincides with the drive-side rotation axis CL1 as with the driving shaft 6. Consequently, the driving shaft 6 is extended by the connecting shaft portion 7a.

(21) A drive-side bearing 11 configured to rotatably support the driving shaft 6 is provided on the front end of the driving shaft 6. A rear-end bearing 17 configured to rotatably support the driving shaft 6 in conjunction with the housing 3 is provided on a rear end (right end in FIG. 1) of the driving shaft 6, i.e., on that end portion of the driving shaft 6 which is opposite the driving scroll member 70.

(22) The driving scroll member 70 includes a first driving scroll unit 71 on the side of the motor 5 and a second driving scroll unit 72 on the side of the discharge orifice 3d.

(23) The first driving scroll unit 71 includes a first drive-side end plate and a first drive-side wall 71b.

(24) The first drive-side end plate 71a extends in a direction orthogonal to the drive-side rotation axis CL1. The first drive-side end plate 71a does not include a driving shaft portion that extends on the drive-side rotation axis CL1. That is, a surface of the first drive-side end plate 71a on the side of the motor 5 is a flat surface.

(25) The first drive-side end plate 71a is connected with the drive-side plate 20. The drive-side plate 20 extends in parallel to the first drive-side end plate 71a. The drive-side plate 20 is connected to an outer periphery of the first drive-side end plate 71a via a fixing portion 20a provided on an outer peripheral edge.

(26) The fixing portion 20a has a tubular shape and extends in parallel to the drive-side rotation axis CL1. A through-hole is formed in the fixing portion 20a, and a bolt 21 is inserted into the through-hole to fix the fixing portion 20a to the first drive-side end plate 71a.

(27) A shaft portion 20b is provided in a center of the drive-side plate 20. The shaft portion 20b is cylindrical in shape and is fixed, on an inner peripheral side, to an outer peripheral side of the connecting shaft portion 7a of the center plate 7. The central axis of the shaft portion 20b coincides with the drive-side rotation axis CL1. Consequently, the shaft portion 20b of the drive-side plate 20 is fixed to the driving shaft 6. The shaft portion 20b and connecting shaft portion 7a are connected with each other by means of serrations, shrinkage fit, a bolt, a key, or the like.

(28) A plan view of the drive-side plate 20 is shown in FIG. 2. The drive-side plate 20 has an outside shape that is substantially triangular in plan view. The fixing portion 20a is provided at each vertex of the triangle and the shaft portion 20b is provided in a central part. Three through-holes 20c are formed on an outer peripheral side of the shaft portion 20b by being spaced away at equal intervals in a circumferential direction. Respective shaft segments 29a (see, for example, FIG. 5) described later is passed through the through-holes 20c. The number of through-holes 20c corresponds to the number of shaft segments 29a.

(29) The first drive-side end plate 71a is substantially disk-shaped in plan view. As shown in FIG. 3, three first drive-side walls 71b, spiral in shape, are provided on the first drive-side end plate 71a. The three first drive-side walls 71b are arranged at equal intervals around the drive-side rotation axis CL1. Note that the number of first drive-side walls 71b may be less than or more than three.

(30) As shown in FIG. 1, the second driving scroll unit 72 includes a second drive-side end plate 72a and second drive-side walls 72b. As with the first drive-side wall 71b (see FIG. 3), three second drive-side walls 72b are provided. Note that the number of second drive-side walls 72b may be less than or more than three.

(31) The second drive-side end plate 72a is connected with a second drive-side shaft portion 72c extending in a direction of the drive-side rotation axis CL1. The second drive-side shaft portion 72c is provided rotatably with respect to the housing 3 via a second drive-side bearing 14. A discharge port 72d is formed in the second drive-side end plate 72a along the drive-side rotation axis CL1.

(32) Between the second drive-side shaft portion 72c and housing 3, two sealing members 26 are provided on a front end side (left end in FIG. 1) of the second drive-side shaft portion 72c than is the second drive-side bearing 14. The two sealing members 26 are placed at a predetermined distance from the second drive-side bearing 14 in the direction of the drive-side rotation axis CL1. Note that the number of sealing members 26 may be one.

(33) The first driving scroll unit 71 and second driving scroll unit 72 are fixed with front ends (free ends) of respective walls 71b and 72b facing each other. The first driving scroll unit 71 and second driving scroll unit 72 are fixed to each other using bolts 31 fastened to flanges 73 provided at plural locations in a circumferential direction, protruding radially outward.

(34) A driven-side end plate 90a of the driven scroll member 90 is located substantially at a center in an axial direction (horizontal direction in FIG. 1). A through-hole 90h is formed in the center of the driven-side end plate 90a such that air after compression will flow to the discharge port 72d.

(35) Driven-side walls 91b and 92b are provided on opposite sides of the driven-side end plate 90a. A first driven-side wall 91b installed extending from the driven-side end plate 90a toward the motor 5 is meshed with the first drive-side wall 71b of the first driving scroll unit 71, and a second driven-side wall 92b installed extending from the driven-side end plate 90a toward the discharge orifice 3d is meshed with the second drive-side wall 72b of the second driving scroll unit 72.

(36) As shown in FIG. 3, three first driven-side walls 91b are provided. The three first driven-side walls 91b are arranged at equal intervals around a driven-side rotation axis CL2. The second driven-side walls 92b have a similar configuration. Note that the number of first driven-side walls may be less than or more than three, and so may the number of second driven-side walls 92b.

(37) A support member 33 is provided on that side (left side in FIG. 1) of the driven scroll member 90 which is closer to the discharge orifice 3d. The support member 33 is fixed to front ends (free ends) of the second driven-side walls 92b with bolts 25.

(38) A support member shaft portion 33a is provided around a central axis of the support member 33 and fixed to the housing 3 via a second support member bearing 38. Consequently, the driven scroll member 90 rotates around the driven-side rotation axis CL2 via the support member 33.

(39) A first side plate 27 is provided on that side (right side in FIG. 1) of the first drive-side end plate 71a which is closer to the motor 5. The first side plate 27 is fixed to front ends (free ends) of the first driven-side walls 91b with bolts 28. The first side plate 27 is provided in parallel to the first drive-side end plate 71a. An endless peripheral wall 27a is erected on the first side plate 27, facing toward the motor 5. Consequently, a recess is formed in the first side plate 27, opening toward the motor 5.

(40) A second side plate 29 is provided on a front end side (right side in FIG. 1) of the peripheral wall 27a. The second side plate 29 is fixed to the peripheral wall 27a with bolts. A through-hole is formed in a center of the second side plate 29 to pass the connecting shaft portion 7a of the center plate 7 therethrough.

(41) A plate portion 7b of the center plate 7 is contained in a space surrounded by the first side plate 27 and second side plate 29. A needle bearing 32a having plural needles is provided in the plate portion 7b. A pin 32b coming into rolling contact with the needle bearing 32a is provided. End portions of the pin 32b are fixed to the first side plate 27 and second side plate 29, respectively. A pin ring mechanism made up of the needle bearing 32a and pin 32b make up a synchronous drive mechanism.

(42) In this way, the first side plate 27 and second side plate 29 make up a driven-side housing section configured to house the synchronous drive mechanism in internal space. The synchronous drive mechanism transmits a driving force between the driving scroll member 70 and driven scroll member 90 such that the driving scroll member 70 and driven scroll member 90 will perform rotating motion in a same direction at a same angular velocity. Lubricant is supplied to the synchronous drive mechanism for wear reduction and other purposes. Note that a crankpin mechanism or a double-pin ring mechanism that uses two pins may be used instead of the pin ring mechanism. Also, by omitting the needle bearing 32a used in the pin ring mechanism, the mechanism may be configured to transmit power by sliding friction between the pin 32b and a round hole.

(43) An O-ring 34 is provided as a sealing member on a center side of the second side plate 29. The O-ring 34 is provided, forming a seal with an end face of the plate portion 7b of the center plate 7. Lubricant for the pin ring mechanism is enclosed by the O-ring 34 in a housing space formed between the first side plate 27 and second side plate 29. In this way, the O-ring 34 installed at a single location is sufficient as a sealing member configured to seal the housing space for use to enclose the lubricant.

(44) The shaft segments 29a are provided in a center of the second side plate 29, protruding toward the motor 5 in parallel to the driven-side rotation axis CL2. Front ends of the shaft segments 29a are axially supported by a side plate bearing 39 provided in the housing 3. Consequently, the driven scroll member 90 rotates around the driven-side rotation axis CL2 via the second side plate 29 and first side plate 27. As shown in FIG. 5, the shaft segments 29a are divided in a circumferential direction and three shaft segments 29a are provided, being spaced away from one another in a circumferential direction. Note that regarding the number of shaft segments 29a, it is sufficient if two or more shaft segments 29a are provided. As shown in FIG. 5, the second side plate 29 has a substantially circular outside shape in plan view.

(45) The drive-side plate 20 shown in FIG. 2 and the second side plate 29 shown in FIG. 5 are combined together and shown in FIG. 6. As shown in FIG. 6, the shaft segments 29a are passed, respectively, through the plural through-holes 20c formed in the drive-side plate 20.

(46) As shown in FIG. 7, the shape of each through-hole 20c is determined based on a trajectory of the shaft segment 29a such that the shaft segment 29a will not interfere with an edge of the through-hole 20c when the driving scroll member 70 and driven scroll member 90 perform turning motion relative to each other. FIG. 7 shows positions of the shaft segment 29a at different turning angles. The shape of each through-hole 20c is a substantially rectangular shape whose sides on the inner periphery and outer periphery are arcs of circles centered at the drive-side rotation axis CL1. The driving force is transmitted from the shaft portion 20b by a connection region 20d remaining between adjacent through-holes 20c.

(47) The co-rotating scroll compressor 1A with the above configuration operates as follows.

(48) When the driving shaft 6 is rotated around the drive-side rotation axis CL1 by the motor 5, the center plate 7 also rotates around the drive-side rotation axis CL1 together with the driving scroll member 70 via the drive-side plate 20 fixed to the connecting shaft portion 7a of the center plate 7 connected to the driving shaft 6. The driving force transmitted to the center plate 7 along with rotation of the center plate 7 is transmitted from the first side plate 27 and second side plate 29 to the driven scroll member 90 via the needle bearing 32a and pin 32b serving together as the synchronous drive mechanism, and thereby causes the driven scroll member 90 to rotate around the driven-side rotation axis CL2. Consequently, the two scroll members 70 and 90 perform revolving motion relative to each other.

(49) When the two scroll members 70 and 90 perform revolving motion, the air sucked through an inlet port in the housing 3 is sucked from outer peripheral sides of the two scroll members 70 and 90 and taken into a compression chamber formed by the two scroll members 70 and 90. Then, a compression chamber formed by the first drive-side walls 71b and first driven-side walls 91b and a compression chamber formed by the second drive-side walls 72b and second driven-side walls 92b are compressed separately. Each of the compression chambers is reduced in volume toward the center, and air is compressed accordingly. The air compressed by the first drive-side walls 71b and first driven-side walls 91b passes through the through-hole 90h formed in the driven-side end plate 90a and joins the air compressed by the second drive-side walls 72b and second driven-side walls 92b. The gas resulting from the joining passes through the discharge port 72d and is discharged outside the housing 3 through the discharge orifice 3d.

(50) The present embodiment achieves the following operations and effects.

(51) Since the shaft portion 20b of the drive-side plate 20 is fixed to the driving shaft 6 of the motor 5 via the connecting shaft portion 7a and the fixing portion 20a of the drive-side plate 20 is fixed to the outer periphery of the driving scroll member 70, the rotational driving force of the motor 5 is transmitted to the driving scroll member 70 via the drive-side plate 20. Since the drive-side plate 20 is placed between the driving scroll member 70 and the motor 5 at a predetermined distance from the driving scroll member 70 in the direction of the drive-side rotation axis CL1 and the rotational driving force is transmitted via the fixing portion 20a fixed to the outer periphery of the driving scroll member 70, a space can be formed between the driving scroll member 70 and drive-side plate 20, extending from the fixing portion 20a provided on the outer periphery to the inner peripheral side including the drive-side rotation axis CL1. That is, in order to transmit the rotational driving force from the motor 5 to the driving scroll member 70, there is no need to provide a driving shaft connected directly to the first drive-side end plate 71a of the driving scroll member 70 by extending on the drive-side rotation axis CL1. This makes it possible to provide the synchronous drive mechanism (needle bearing 32a and pin 32b) between the driving scroll member 70 and drive-side plate 20 without forming a through-hole in the first side plate 27 to pass a driving shaft connected directly to the first drive-side end plate 71a therethrough. This in turn makes it possible to adopt a structure configured to house the synchronous drive mechanism, avoid lack of lubrication by inhibiting leakage of lubricant supplied to the synchronous drive mechanism, and thereby achieve longer life and inhibit contamination of compressed fluid with the lubricant.

(52) The first side plate 27 fixed to the driven scroll member 90 and the second side plate 29 configured to form a housing space in conjunction with the first side plate 27 are provided making up a driven-side housing section configured to house the synchronous drive mechanism. This makes it possible to inhibit leakage of lubricant by housing the synchronous drive mechanism.

(53) The plural shaft segments 29a are provided in the second side plate 29 and the through-holes 20c are formed in the drive-side plate 20 to pass the respective shaft segments 29a therethrough. Consequently, the driven scroll member 90 can be rotatably and axially supported by the shaft segments 29a at a position in the housing 3 on the motor 5 side with respect to the drive-side plate 20.

(54) [Modification]

(55) Note that the co-rotating scroll compressor 1A shown in FIG. 1 can be modified as shown in FIG. 8. A co-rotating scroll compressor 1B according to the present modification does not include the shaft segments 29a of the co-rotating scroll compressor 1A shown in FIG. 1 (see FIG. 5).

(56) As shown in FIG. 8, a third side plate 35 is fixed to that side of the second side plate′ 29 which is closer to the motor 5. A fixing portion (cylindrical shaft portion fixing portion) 35b is provided in an end portion of the third side plate 35, extending in parallel to the driven-side rotation axis CL2 on an outer peripheral side of the drive-side plate 20. Using a bolt 40 passed through a through-hole formed in the fixing portion 35b, the third side plate 35 is fixed to an outer periphery of the second side plate 29′. A cylindrical shaft portion 35a, cylindrical in shape, is provided on a center side of the third side plate 35. The cylindrical shaft portion 35a is axially supported by a side plate bearing 39 provided in the housing 3.

(57) Since the third side plate 35 is fixed to the second side plate′ 29 using a region on the outer peripheral side of the drive-side plate 20, the present modification allows the cylindrical shaft portion 35a to be adopted without the need to adopt the shaft segments shown in FIG. 5 and thereby allows the rigidity of the shaft portion to be increased.

Second Embodiment

(58) Next, a second embodiment of the present invention will be described with reference to FIG. 9. The present embodiment has a structure resulting from omitting the first side plate 27 of the co-rotating scroll compressor 1A according to the first embodiment shown in FIG. 1. Also, in a co-rotating scroll compressor 1C according to the present embodiment, the driving scroll member 70 and driven scroll member 90 of the co-rotating scroll compressor 1A shown in FIG. 1 are exchanged with each other to use the driving scroll member 70 as a driven scroll member, and the driven scroll member 90 as a driving scroll member. Therefore, in the following description, the driven scroll member of the co-rotating scroll compressor 1C according to the present embodiment corresponding to the driving scroll member 70 of the co-rotating scroll compressor 1A shown in FIG. 1 will be denoted by putting an apostrophe (′) after the reference sign of the corresponding component and the driving scroll member of the co-rotating scroll compressor 1C according to the present embodiment corresponding to the driven scroll member 90 of the co-rotating scroll compressor 1A shown in FIG. 1 will be denoted by putting an apostrophe (′) after the reference sign of the corresponding component. Also, the same components as those in the first embodiment are denoted by the same reference numerals as the corresponding components of the first embodiment, and description thereof will be omitted.

(59) As shown in FIG. 9, around a first driven-side end plate 71a′ of a driven scroll member 70′, an endless peripheral wall 71c′ is erected on the side of the motor 5. The second side plate 29 is fixed to the peripheral wall 71c′ with bolts 30. The shaft segments 29a are provided on the center side of the second side plate 29, extending in the direction of the drive-side rotation axis CL1. The shaft segments 29a are axially supported by the side plate bearing 39.

(60) The drive-side plate 20 is fixed to a driving scroll member 90′ with the bolt 21. Consequently, the rotational driving force of the motor 5 is transmitted from the driving shaft 6 to the drive-side plate 20 via the connecting shaft portion 7a of the center plate 7, thereby rotationally driving the driving scroll member 90′.

(61) In this way, the present embodiment achieves operations and effects similar to those of the first embodiment, allows the first side plate 27 of the co-rotating scroll compressor 1A shown in FIG. 1 to be omitted, and enables cost reductions. Also, since the first side plate 27 is omitted, members that determine phases of the driving scroll member and driven scroll member are reduced, making phase matching easier. This reduces leakage of compressed fluid, resulting in improved efficiency.

(62) Note that as shown in FIGS. 10A and 10B, an insertion member 36 may be inserted into spaces formed between pairs of circumferentially adjacent shaft segments 29a according to the first embodiment or second embodiment. The insertion member 36 includes insertion portions 36a corresponding to the spaces formed between the pairs of circumferentially adjacent shaft segments 29a and an annular portion 36b integrating the insertion portions 36a on a front end side. A cylindrical shaft portion is formed by fitting the insertion member 36 over the shaft segments 29a and thereby integrating the insertion member 36 and shaft segments 29a. This improves the strength of the shaft segments.

REFERENCE SIGNS LIST

(63) 1A, 1B, 1C Co-rotating scroll compressor 3 Housing 3a Motor housing section 3b Scroll housing section 3d Discharge orifice 5 Motor (drive unit) 5a Stator 5b Rotor 6 Driving shaft 7 Center plate 7a Connecting shaft portion 7b Plate portion 11 Drive-side bearing 14 Second drive-side bearing 17 Rear-end bearing 20 Drive-side plate 20a Fixing portion 20b Shaft portion 20c Through-hole 20d Connection region 21 Bolt 25 Bolt 26 Sealing member 27 First side plate 27a Peripheral wall 28 Bolt 29, 29′ Second side plate 29a Shaft segment 30 Bolt 31 Bolt 32a Needle bearing 32b Pin 34 O-ring 35 Third side plate 35a Cylindrical shaft portion 35b Fixing portion (cylindrical shaft portion fixing portion) 36 Insertion member 36a Insertion portion 36b Annular portion 39 Side plate bearing 40 Bolt 70 Driving scroll member 71 First driving scroll unit 71a First driven-side end plate 71b First drive-side wall 72 Second driving scroll unit 72a Second drive-side end plate 72b Second drive-side wall 72c Second drive-side shaft portion 72d Discharge port 90 Driven scroll member 90a Driven-side end plate 90h Through-hole 91b First driven-side wall 92b Second driven-side wall 70′ Driven scroll member 71′ First driven-side scroll unit 71a′ First driven-side end plate 71a′ 71b′ First driven-side wall 71c′ Peripheral wall 72′ Second driven-side scroll unit 72a′ Second drive-side end plate 72b′ Second driven-side wall 72c′ Second driven-side shaft portion 72d′ Discharge port 90′ Driving scroll member 90a′ Drive-side end plate 90h′ Through-hole 91b′ First drive-side wall 92b′ Second drive-side wall CL1 Drive-side rotation axis CL2 Driven-side rotation axis