JP2001280271A - Scroll type fluid machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance machining precision of a drive shaft and workability during machining and to improve productivity by situating an eccentric cylinder body on the end part side of the drive shaft separately. SOLUTION: A drive shaft 10 is rotatably situated in a casing 1 and an eccentric cylinder body 14 is fixed in a whirl-stop state on the end part side of the drive shaft 10. A revolving scroll 5 is rotatably coupled to the outer peripheral side of the eccentric cylinder body 14 through a swing bearing 15 and the revolving scroll 5 is situated in a state to be positioned eccentrically by a distance equivalent to a size δ of the eccentric cylinder body 1 from a fixed scroll 4. As a result, its shape is simplified by forming the whole of the drive shaft 10 in a coaxial state, the drive shaft 10 is capable of being easily machined with high precision, and the turning radius of the revolving scroll 5 is accurately set according to the size δof the eccentric cylinder body 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scroll type fluid machine suitable for use in, for example, an air compressor or a vacuum pump.

[0002]

2. Description of the Related Art Generally, a scroll-type fluid machine includes a casing, a fixed scroll provided on the casing and having a spiral wrap portion provided on a head plate, a drive shaft rotatably provided on the casing. In the casing, a spiral wrap portion that is rotatably connected to an end side of the drive shaft via a swivel bearing and that overlaps with the wrap portion of the fixed scroll to define a plurality of compression chambers is provided upright on the head plate. Orbiting scroll.

A conventional scroll type fluid machine of this kind is provided on the outer peripheral side of a fixed scroll by rotating a drive shaft from the outside and orbiting the orbiting scroll with a predetermined eccentricity relative to the fixed scroll. While sucking a fluid such as air from the suction port, the fluid is sequentially compressed in each compression chamber between the wrap portion of the fixed scroll and the wrap portion of the orbiting scroll, and compressed from the discharge port provided at the center of the fixed scroll. The fluid is discharged to the outside.

[0004] For this reason, the drive shaft is provided with a main shaft portion rotatably provided in the casing via a bearing, and is provided in the casing at an end portion side of the main shaft portion, with respect to the axis of the main shaft portion. The main shaft portion and the crankshaft portion are formed integrally by, for example, machining a high-strength metal material by cutting or the like.

[0005] The main shaft portion has an end portion located on the side opposite to the crankshaft portion protruding outside from the casing.
A drive source such as an electric motor is connected to the protruding end side.
A revolving scroll is rotatably connected to the outer peripheral side of the crankshaft via a revolving bearing.

When the main shaft of the drive shaft is driven to rotate by an electric motor or the like, the orbiting scroll is driven by the crankshaft through a orbiting bearing or the like, whereby the orbiting scroll is eccentric to the crankshaft. A turning motion is performed on the fixed scroll with a turning radius corresponding to the size.

[0007]

In the above-mentioned prior art, the main shaft portion of the drive shaft and the crankshaft portion are integrally formed by machining means such as cutting, for example. On the other hand, it is configured to be processed to be eccentric by a predetermined dimension.

However, when forming the drive shaft, it is necessary to form a crankshaft eccentric by a predetermined dimension with respect to the main shaft with high precision by processing a high-strength metal material or the like. There is a problem that processing takes time.

Moreover, in the drive shaft formed in this manner, since the eccentric dimension of the crankshaft portion is liable to cause an error or a dimensional variation, the dimensional accuracy of the drive shaft is reduced, so that the turning radius of the orbiting scroll is designed. There is a possibility that the above-mentioned standard values and the like may be deviated from each other, and there is a problem that the compression performance and reliability of the scroll fluid machine are reduced.

Further, for example, when manufacturing a plurality of types of scroll fluid machines having different specifications such as compression performance, it is necessary to change the turning radius or the like of the orbiting scroll in accordance with the specifications of each model. Since it is necessary to form several types of drive shafts having different eccentric dimensions with high accuracy, there is a problem that it is difficult to improve productivity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to simplify the shape of a drive shaft so that the machining can be easily performed with high precision. It is an object of the present invention to provide a scroll-type fluid machine capable of stabilizing the compression operation of the scroll type, easily changing a turning radius of the orbiting scroll, and improving compression performance and reliability.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a casing, a fixed scroll provided on the casing and having a spiral wrap portion provided on a mirror plate, and a rotatable casing mounted on the casing. A drive shaft provided on the
In the casing, a spiral wrap portion that is rotatably connected to an end side of the drive shaft via a swivel bearing and that overlaps with the wrap portion of the fixed scroll to define a plurality of compression chambers is provided upright on the head plate. The present invention is applied to a scroll-type fluid machine including an orbiting scroll.

A feature of the structure adopted by the first aspect of the present invention is that a cylindrical shape extending in the axial direction is formed between the drive shaft and the slewing bearing so that the outer circumferential surface of the inner circumferential side fitting hole is formed. An eccentric cylinder whose surface is eccentric in the radial direction is provided, and a fitting hole of the eccentric cylinder is fitted to the outer peripheral side of the end of the drive shaft in a detent state, and the outer peripheral surface of the eccentric cylinder is The configuration is such that the orbiting scroll is rotatably connected via the orbit bearing.

With this configuration, the orbiting scroll can be rotatably connected to the drive shaft via the eccentric cylinder and the orbiting bearing. At this time, the axis of the orbiting scroll is
The eccentric cylinder is radially eccentric with respect to the axis of the drive shaft by the eccentric dimension formed between the fitting hole and the outer peripheral surface. Therefore, the orbiting scroll can be turned by the drive shaft via the eccentric cylinder and the orbit bearing.

According to the second aspect of the present invention, the drive shaft is rotatably provided on the casing via a bearing and connected to an external drive source, and is coaxial with an end of the main shaft. And an outer peripheral side to which the eccentric cylindrical body is fitted.

Thus, the entire drive shaft can be formed coaxially with respect to a single axis, the shape can be simplified, and even if the drive shaft is coaxial, the orbiting scroll can be turned by the eccentric cylinder. it can.

According to the third aspect of the present invention, a detent portion is provided between the eccentric cylinder and the drive shaft to hold the eccentric cylinder in a detented state with respect to the drive shaft.

Thus, the rotation preventing portion can hold the eccentric cylinder in the rotation preventing state on the outer peripheral side of the drive shaft. When the drive shaft is driven to rotate, the eccentricity is caused by the reaction force applied to the eccentric cylinder from the orbiting scroll side. It is possible to prevent the cylinder from sliding with respect to the drive shaft.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a scroll type air compressor will be described in detail as an example of a scroll type fluid machine according to an embodiment of the present invention with reference to the accompanying drawings.

FIGS. 1 to 6 show a first embodiment of the present invention. In the drawings, reference numeral 1 denotes a casing which forms an outer frame of a scroll type air compressor. It includes a casing body 2 and a thrust receiver 3.

Reference numeral 2 denotes a bottomed cylindrical casing body formed by opening one side and closing the other side.
Is composed of an annular bottom 2A, a cylindrical portion 2B extending axially from the outer periphery of the bottom 2A, and a bearing 2C protruding from the inner periphery of the bottom 2A.

Reference numeral 3 denotes a substantially annular thrust receiver provided on the opening side of the casing main body 2. The thrust receiver 3 has, as shown in FIGS. 3A, and an opening 3B opened on the bottom side of the recess 3A. The thrust receiver 3 receives a thrust force applied to the orbiting scroll 5 by the air pressure in the compression chamber 6 described later.

Reference numeral 4 denotes a fixed scroll provided at one end of the casing 1. The fixed scroll 4 is formed in a substantially disk shape and is disposed so that the center thereof coincides with an axis O1-O1 of a drive shaft 10 described later. A mirror plate 4A, a spiral wrap portion 4B erected on the surface of the mirror plate 4A, a cylindrical portion 4C protruding in the axial direction so as to surround the wrap portion 4B from the outer peripheral side of the mirror plate 4A, And a flange portion 4D that projects radially outward from the outer peripheral side of the portion 4C and abuts against the thrust receiver 3.

Reference numeral 5 denotes a revolving scroll provided in the casing 1 so as to be revolvable opposite to the fixed scroll 4. The revolving scroll 5 is formed in a disk shape as shown in FIG. A head plate 5A housed therein;
A spiral wrap portion 5B provided in the axial direction from the front surface of the end plate 5A; and a boss portion provided at the center on the back side of the end plate 5A and protruding toward the casing body 2 through the opening 3B of the thrust receiver 3. 5C.

Here, the end surface of the end plate 5A is in sliding contact with the flange portion 4D of the fixed scroll 4, and the back surface (the back surface) is in sliding contact with the thrust receiver 3. The wrap portion 5B is disposed so as to overlap with the wrap portion 4B of the fixed scroll 4 by being shifted by, for example, 180 degrees, and a plurality of compression chambers 6, 6, ... are defined between the wrap portions 4B and 5B. Has been established. The drive shaft 10 is rotatably connected to the boss 5C via an eccentric cylinder 14 and a swivel bearing 15, which will be described later.

The orbiting scroll 5 is driven by a drive shaft 10 via an eccentric cylinder 14 and an orbiting bearing 15 as described later, and performs an orbiting motion with respect to the fixed scroll 4. As a result, the scroll air compressor
After sucking air from the suction port 7 provided on the outer peripheral side of the fixed scroll 4 into the compression chamber 6 on the outer peripheral side, this air is sequentially compressed in each compression chamber 6 while the orbiting scroll 5 orbits. The compressed air in the compression chamber 6 on the center side is discharged to the outside from a discharge port 8 provided on the center side of the fixed scroll 4.

Reference numeral 9 denotes a rotation preventing mechanism provided between the thrust receiver 3 and the orbiting scroll 5.
As shown in FIG. 1 and FIG. 2, the thrust receiver 3 and the orbiting scroll 5 are each provided with a guide portion provided on the orbiting scroll 5 and an Oldham ring slidable along these guide portions. . The rotation preventing mechanism 9 guides the orbiting scroll 5 in two axial directions orthogonal to each other with respect to the fixed scroll 4.
To prevent the rotation of the vehicle.

Numeral 10 denotes a drive shaft rotatably provided on the casing 1. The drive shaft 10 is, as shown in FIGS.
For example, it is formed by machining a high-strength metal material such as cutting, and has a stepped columnar shape centered on the axis O1-O1. The drive shaft 10 is formed integrally with a stepped cylindrical main shaft portion 10A rotatably supported on the casing main body 2 via bearings 11 and 12, and coaxially with one end of the main shaft portion 10A. The outer peripheral side includes a cylindrical tubular body fitting portion 10B into which an eccentric tubular body 14 described later is fitted.

Here, the main shaft portion 10A has a large diameter portion 10A1 formed at the one end side of the drive shaft 10 having the largest diameter of the drive shaft 10, and the cylindrical body fitting portion 10B is formed of the large diameter portion 10B.
1 protrudes in the axial direction toward the inside of the boss 5C of the orbiting scroll 5. As shown in FIG. 5, a semicircular balance weight 13 that balances the rotation of the drive shaft 10 with respect to the orbiting scroll 5 is provided at one end of the main shaft portion 10A so as to protrude in the radial direction. On the other hand, the main shaft 10A
The other end protrudes out of the casing 1 and is connected to a drive source (not shown) such as an electric motor.

Numeral 14 denotes an eccentric cylinder formed of a high-strength metal material such as stainless steel.
Has a cylindrical shape extending in the axial direction as shown in FIGS. The eccentric cylindrical body 14 has a circular fitting hole 14A on the inner peripheral side centered on the axis O1-O1, and the outer peripheral side centered on the axis O2-O2 eccentric in the radial direction by the dimension δ from the axis O1-O1. Eccentric outer peripheral surface 14B.

The eccentric cylindrical body 14 is fitted on the outer peripheral side of the cylindrical body fitting portion 10B of the drive shaft 10 by, for example, press-fitting so that the fitting hole 14A side is prevented from rotating.
The 4B side is fitted into an inner ring 15A of a later-described orbiting bearing 15, and the orbiting scroll 5 is inserted through the orbiting bearing 15.
Is rotatably connected to the boss 5C.

As a result, as shown in FIG. 1, the orbiting scroll 5 is arranged so that its axis is radially eccentric with respect to the axis O 1 -O 1 of the drive shaft 10 by the dimension δ of the eccentric cylinder 14. When the drive shaft 10 is rotationally driven, the drive shaft 10 is configured to make a turning motion with a turning radius corresponding to the dimension δ.

Reference numeral 15 denotes a slewing bearing constituted by, for example, a cylindrical roller bearing. The slewing bearing 15 is, as shown in FIG.
B, and a plurality of rolling elements 15B, 15B,... Which are rotatably arranged on the outer peripheral side of the inner ring 15A.
And an outer ring 15C rotatably connected to the outer peripheral side of the inner ring 15A with the rolling elements 15B interposed therebetween and fitted in the boss 5C of the orbiting scroll 5.

The scroll type air compressor according to the present embodiment has the above-described configuration, and its operation will be described below.

First, when the drive shaft 10 is rotated by a drive source such as an electric motor, the orbiting scroll 5 is eccentric with respect to the axis O 1 -O 1 of the drive shaft 10 by the dimension δ of the eccentric cylinder 14. Therefore, a circular motion (turning motion) having a turning radius of the dimension δ is performed around the drive shaft 10.

Thus, in the orbiting scroll 5, the compression chambers 6, 6,... Defined between the wrap portion 5B and the wrap portion 4B of the fixed scroll 4 are continuously reduced, and the suction opening of the fixed scroll 4 is formed. Outside air sucked from each compression chamber 6
The compressed air is discharged from the discharge port 8 to an external air tank (not shown) or the like while sequentially compressing the compressed air.

In this case, during the turning operation of the orbiting scroll 5, the Oldham ring of the rotation preventing mechanism 9 slides along the guide portion on the thrust receiver 3 side and the guide portion on the orbiting scroll 5 side, thereby driving the drive shaft. The rotation torque of the orbiting scroll 5 via 10 is received between these guide portions and the Oldham ring, whereby the orbiting scroll 5 performs a orbiting motion without rotating.

On the other hand, at the time of manufacturing the air compressor, as shown in FIG. 6, the main shaft portion 10A of the drive shaft 10 and the cylinder fitting portion 10B are integrally formed by, for example, shaving or the like. The eccentric cylindrical body 14 is press-fitted and mounted on the outer peripheral side of the joint portion 10B.

When manufacturing a plurality of types of air compressors having different specifications such as compression performance, a plurality of types of eccentric cylinders 14 having different dimensions δ are prepared in accordance with the specifications of each model. I do. And these eccentric cylinders 14
Are attached to the drive shafts 10 having the same shape, thereby assembling a plurality of types of air compressors having different turning radii of the orbiting scroll 5.

Thus, according to the present embodiment, the eccentric cylinder 14 is provided between the drive shaft 10 and the slewing bearing 15, and the fitting hole 14A side of the eccentric cylinder 14 is connected to the cylinder of the drive shaft 10. The orbiting scroll 5 is connected via the orbiting bearing 15 to the eccentric outer peripheral surface 14B side of the eccentric cylindrical body 14 so that the orbital axis of the orbiting scroll 5 is connected to the drive shaft. The eccentric cylinder 14 can be eccentric in the radial direction by the dimension δ of the eccentric cylinder 14 with respect to the axis O 1 -O 1 of the drive shaft 1.
At the time of rotation drive of 0, the dimension δ with respect to the orbiting scroll 5
Can be given.

As a result, the main shaft portion 10A and the cylindrical body fitting portion 10B of the drive shaft 10 can be formed coaxially with respect to the axis O1-O1, so that their shapes can be simplified, and the drive shaft 10 can be cut out. By means, it can be easily processed with high accuracy. Even if the entire drive shaft 10 has a coaxial shape, the amount of eccentricity (orbital radius) of the orbiting scroll 5 can be accurately set in accordance with the dimension δ of the eccentric cylinder 14, and the compression performance as an air compressor is stabilized. And reliability can be improved as compared with the prior art.

Further, at the time of manufacturing an air compressor, for example, simply mounting a plurality of types of eccentric cylinders 14 having different dimensions δ to the drive shaft 10 having the same shape, the orbiting scroll 5
Air compressors of different specifications with different turning radii (compression performance) can be easily assembled, eliminating the need for preparing several types of drive shafts as in the prior art. Performance can be improved. Further, for example, when assembling a single-specification air compressor, the wrap portion 4B of the fixed scroll 4 and the wrap portion 5B of the orbiting scroll 5 can be obtained simply by replacing the eccentric cylinder 14.
Can be easily adjusted.

In this case, since the fitting hole 14A side of the eccentric tubular body 14 is stopped by press fitting to the outer peripheral side of the tubular fitting portion 10B of the drive shaft 10, the eccentric tubular body 14 is prevented from rotating by a simple structure. When the drive shaft 10 is rotationally driven, it is possible to reliably prevent the eccentric cylinder 14 from sliding against the drive shaft 10 due to the reaction force applied to the eccentric cylinder 14 from the orbiting scroll 5 side. .

Next, FIG. 7 shows a second embodiment according to the present invention. The feature of this embodiment is that a detent portion is provided between the drive shaft and the eccentric cylinder. . In addition,
In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Numeral 21 denotes a fitting projection as a rotation preventing portion provided on the cylindrical fitting portion 10B of the drive shaft 10 so as to protrude outward in the radial direction. Hole 14
The eccentric cylindrical body 14 is fitted into a concave groove 22 provided on the A side and cooperates with the concave groove 22 to hold the eccentric cylinder 14 in a detented state with respect to the drive shaft 10.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those of the first embodiment can be obtained, and the eccentric cylinder is formed by using the fitting projection 21 and the concave groove 22. The body 14 can be held in a more stable detent state.

Next, FIG. 8 shows a third embodiment according to the present invention. The feature of this embodiment lies in that the detent portion is constituted by a spline. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 31 denotes a male spline as a detent provided on the outer peripheral side of the cylindrical fitting portion 10B of the drive shaft 10. The male spline 31 is provided on the fitting hole 14A side of the eccentric cylindrical body 14. Eccentric cylinder 14 engaged with female spline 32
Are held in a detented state with respect to the drive shaft 10.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those of the first embodiment can be obtained, and the eccentric cylinder 14 can be made more stable by using the splines 31 and 32. Can be kept in the locked state.

In the first embodiment, the eccentric cylinder 14 is fitted to the outer peripheral side of the cylinder fitting portion 10B of the drive shaft 10 in a detented state by, for example, press fitting. However, the present invention is not limited to this, and the outer peripheral side of the cylindrical body fitting portion and the inner peripheral side of the eccentric cylindrical body may be formed into a non-circular cross-sectional shape such as a D-shape, and these may be fitted. In such a case, the eccentric cylinder may be attached to the outer periphery of the cylinder fitting portion in a non-rotating state.

In the second embodiment, the fitting projection 21 is provided on the drive shaft 10 side, and the concave groove 2 is provided on the eccentric cylinder 14 side.
However, the present invention is not limited to this, and a concave groove is provided on the outer peripheral side of the drive shaft, and a fitting projection fitted into the concave groove is formed on the inner peripheral side of the eccentric cylinder. It is good also as a structure provided.

Further, in each of the above embodiments, a scroll air compressor has been described as an example of a scroll fluid machine. However, the present invention is not limited to this, and can be widely applied to, for example, a refrigerant compressor. It is.

[0053]

As described above in detail, according to the first aspect of the present invention, since the eccentric cylinder is provided between the drive shaft and the slewing bearing, only the dimension of the eccentric cylinder is eccentric. The orbiting scroll can be eccentric with respect to the drive shaft.
Thus, for example, the entire drive shaft can be formed coaxially with respect to a single axis, the shape can be simplified, and the drive shaft can be easily machined with high accuracy. In addition, the turning radius of the orbiting scroll can be accurately set according to the size of the eccentric cylinder, the compression performance of the scroll fluid machine can be stabilized, and the reliability can be improved as compared with the related art. Also, for example, by simply mounting a plurality of types of eccentric cylinders having different eccentric dimensions to drive shafts having the same shape, it is possible to easily assemble a plurality of types of scroll fluid machines having different turning radii of the orbiting scroll,
It is possible to manufacture scroll-type fluid machines of a plurality of specifications having different compression performances and the like without preparing many types of drive shafts as in the prior art.

According to the second aspect of the present invention, the drive shaft is provided with a main shaft portion rotatably provided on the casing, and the eccentric cylindrical body is coaxially provided on the end side of the main shaft portion and is fitted on the outer peripheral side. Since the drive shaft is configured with the fitted cylinder fitting portion, the entire drive shaft can be formed coaxially with respect to a single axis, and the drive shaft can be easily processed with high accuracy by simplifying the shape, Productivity can be improved. And even if a drive shaft is a coaxial shape, an orbiting scroll can be made to orbit stably by an eccentric cylinder.

According to the third aspect of the present invention, a detent portion is provided between the eccentric cylinder and the drive shaft to hold the eccentric cylinder in a detent state with respect to the drive shaft. The eccentric cylinder can be held in a stable detent state by the rotation preventing portion, and when the drive shaft is driven to rotate, the eccentric cylinder slides on the drive shaft by a reaction force applied to the eccentric cylinder from the orbiting scroll side. Can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a scroll type air compressor according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the air compressor as viewed from the direction of arrows II-II in FIG.

FIG. 3 is an enlarged view of a main part in FIG. 1 showing a drive shaft, an eccentric cylinder, and the like.

FIG. 4 is a front view showing a drive shaft and an eccentric cylinder body partially broken away.

FIG. 5 is a cross-sectional view as seen from a direction indicated by arrows VV in FIG. 4;

FIG. 6 is a front view showing a state in which the eccentric cylinder is attached to a drive shaft.

FIG. 7 is a partial sectional view showing a drive shaft and an eccentric cylinder of a scroll type air compressor according to a second embodiment of the present invention.

FIG. 8 is a partial sectional view showing a drive shaft and an eccentric cylinder of a scroll type air compressor according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Casing main body 3 Thrust receiver 4 Fixed scroll 4A, 5A End plate 4B, 5B Lapping part 5 Orbiting scroll 5C Boss part 6 Compression chamber 7 Suction port 8 Discharge port 9 Rotation prevention mechanism 10 Drive shaft 10A Main shaft part 10B Cylindrical fitting Part 11, 12 Bearing 13 Balance weight 14 Eccentric cylinder 14A Fitting hole 14B Eccentric outer peripheral surface (outer peripheral surface) 15 Slewing bearing 15A Inner ring 15B Rolling element 15C Outer ring 21 Fitting projection (rotation stop part) 22 Depressed groove (rotation stop part) ) 31 Male spline (rotation stop) 32 Female spline (rotation stop)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Susumu Sakamoto 1116 Koizono, Ayase-shi, Kanagawa Prefecture Tokiko Corporation Sagami Plant (72) Inventor Yoshio Kobayashi 1116 Koizono, Ayase-shi, Kanagawa Prefecture Tokiko Corporation Sagami Plant F-term ( Reference) 3H039 AA02 AA12 BB07 BB08 CC09 CC10 CC12 CC13

Claims (3)

[Claims] 1. A casing, a fixed scroll provided on the casing, and a spiral wrap portion provided on a head plate, and a drive shaft rotatably provided on the casing,
In the casing, a spiral wrap portion that is rotatably connected to an end side of the drive shaft via a swivel bearing and that overlaps with the wrap portion of the fixed scroll to define a plurality of compression chambers is provided upright on the head plate. In the scroll-type fluid machine including the orbiting scroll, between the drive shaft and the orbiting bearing, the outer peripheral surface is formed in a cylindrical shape extending in the axial direction, and the outer peripheral surface is radially oriented with respect to the inner peripheral side fitting hole. An eccentric eccentric cylinder is provided, and a fitting hole of the eccentric cylinder is fitted to the outer peripheral side of the end of the drive shaft in a detent state. A scroll-type fluid machine, wherein a orbiting scroll is rotatably connected. 2. The drive shaft, wherein the drive shaft is rotatably provided on the casing via a bearing, and is connected to an external drive source. The drive shaft is provided coaxially with an end of the main shaft and is provided on an outer peripheral side thereof. 2. The scroll-type fluid machine according to claim 1, further comprising a cylindrical body fitting portion into which said eccentric cylindrical body is fitted. 3. The scroll according to claim 1, wherein a detent portion is provided between the eccentric cylinder and the drive shaft to hold the eccentric cylinder in a detented state with respect to the drive shaft. Fluid machine.