JP2000045966A - Rotation prevention mechanism for scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the rotation stop mechanism of a scroll type compressor with longer durability life by reducing the concentrated load in a rotation stop mechanism wherein a ball is sandwiched between a pair of races. SOLUTION: A rotation stop mechanism 10 for a scroll type compressor is provided with at least a pair of movable race 1 and a fixed race 2 opposed to each other uniaxially with a ball 3 inserted therebetween, which is disposed on a movable scroll member out of a fixed scroll member and a movable scroll member which relatively turn around the single axis, and thus the rotation of the movable scroll member is prevented. Opposing surfaces of the pair of the movable race 1 and the fixed race 2 are substantially in contact with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation preventing mechanism for preventing the orbiting scroll member of a scroll compressor from rotating.

[0002]

2. Description of the Related Art Conventionally, a scroll compressor as shown in FIG. 11 has been proposed. Referring to FIG. 11, a scroll compressor 100 includes a casing 101 that forms an outer shell opened at one end, a front housing 102 provided at one end opening of the casing 101, and a protrusion 102 a of the front housing 102. And a crankshaft 103 provided. Casing 1
01 and a front housing 102, a fixed spiral member 105 fixed to the casing 101 is provided in the crank chamber 104 so as to be opposed to the fixed spiral member 105. , The movable spiral member 10 which makes a relatively revolving motion about the axis.
6 is provided. The movable spiral member 106 includes a side plate 107.
A spiral body 108 provided on one surface side of the side plate;
07 and a boss 109 protruding from the other surface side. An eccentric bush 112 is accommodated in the boss 109. The eccentric bush 112 is provided with a through hole 113 at an eccentric position thereof, and has a peripheral surface rotatably supported via a bearing 114.
A large-diameter portion 110 is formed at an end of the crankshaft 103 on the side of the crank chamber 104, and a crankshaft 1 is formed on the opposite side of the large-diameter portion 110 from the crankshaft 103.
A crank pin 111 is protrudingly provided at a position eccentric with respect to the central axis 03. The crank pin 111 is inserted into the through hole 113 of the eccentric bush 112. Protrusion 102
The crankshaft 103 in a is supported by bearings 115 and provided with a sealing member 116.
The large-diameter portion 110 of the crankshaft 103 is supported by the front housing 102 via a bearing 117. Reference numeral 119 denotes the movable spiral member 10
6 is a counterbalance weight for maintaining balance with respect to the axis.

The protruding portion 102 of the front housing 102
An electromagnetic clutch 120 is provided around “a”.
The electromagnetic clutch 120 includes a hollow annular rotor 1 provided around the protrusion 102 a via a bearing 118.
21 and the electromagnet device 1 provided inside the rotor 121
22 and a clutch plate 123 provided to face the outer end surface of the rotor 121.
At the center position, it is fixed to one end of the crankshaft 103 by a fixing member.

In the crank chamber 104, a rotation preventing mechanism 50 is provided around the boss 109 at the other end of the side plate 107 of the variable spiral member 106 and on the inner wall of the front housing 102. The rotation preventing mechanism includes a movable race 51 provided on the movable spiral member 106, a fixed race 52 fixed to the inner wall of the front housing 102, and a ball 53 provided between the movable race 51 and the fixed race 52. Have.

FIG. 12 is a sectional view showing the rotation preventing mechanism of FIG. 13 is a front view of the movable race 51 of FIG. 12, FIG. 14 is a partial sectional view of the movable race of FIG.
FIG. 15 is a front view showing the fixed race of FIG. 12, and FIG. 15 is a partial sectional view of FIG.

Referring to FIG. 12, FIG. 13 and FIG. 14, the movable race 51 is formed of a plate having an annular shape, and the central portion protrudes from one surface of the plate by embossing. A ring-shaped ball transfer groove 51a having a projected portion 51d is provided. In addition, movable race 5
The other plate surface has a protrusion 51b formed by embossing, which is formed by unevenness corresponding to the unevenness of the ball transfer groove 51a when the ball transfer groove 51a is formed. Also,
A fixing hole 51c for fixing to the movable spiral member 106 is formed radially inside the ball transfer groove 51a.

Referring to FIGS. 12, 15, and 16, similarly, the fixed race 52 is provided with a ring-shaped ball transfer groove 52a having a projection 51d whose central portion protrudes from its periphery. On one surface, the protrusions 5 are provided on the other surface, and the protrusions 5 correspond to the ball transfer grooves 52a.
2b is formed. Also, the front housing 10
2 is provided with a fixing hole 52c for fixing to the inner wall surface.

FIG. 17 is a sectional view showing another example of a scroll compressor according to the prior art. FIG.
FIG. 18 is a sectional view showing a rotation preventing mechanism 60 of the scroll compressor of FIG. 17. The scroll compressor shown in FIG.
The scroll type compressor shown in FIG.
It has the same configuration except that 0 is different. Specifically, FIG.
As shown in FIG. 8, the fixed race 61 and the fixed ring 62
And the movable race 65 and the movable ring 64 are formed separately from each other. The fixed race 61 and the fixed ring 6
2 are in contact with each other on opposing surfaces and are fixed to the inner wall of the front housing by pins or the like. on the other hand,
The movable race 65 and the movable ring 64 are also in contact with each other on the opposing surfaces, and are fixed to the rear surface of the movable spiral member by pins or the like.

A ball receiving portion is formed by the contact surface 61a of the fixed race 61 and the ball receiving hole 66 of the fixed ring 62, while the contact surface 65a of the movable race 65 is formed.
Similarly, the ball receiving hole 67 of the movable ring 64 also constitutes a ball receiving portion. The ball 63 is accommodated between these opposing members to constitute a rotation preventing mechanism. At this time, the opposing surfaces of the fixed ring 62 and the movable ring 64 are assembled with a gap therebetween.

The rotation preventing mechanism 50 shown in FIG. 12 has an axial gap between a pair of movable races 51 and a fixed race 52 so that they do not contact each other.

The rotation preventing mechanism 60 shown in FIG.
Also, the pair of movable races 64 and fixed races 62
It is a structure that has a gap in the axial direction between them and does not contact each other with the race part.

[0012]

However, in the case of the conventional rotation preventing mechanism, the combined load of the axial direction and the rotation preventing load due to the compressed gas applied to the movable vortex has a slight surface contact with the ball 53 and the race 51. , 52, the contact surface pressure is increased, and the durability life is reduced.

Although the ball transfer grooves 51a and 52a have central projections 51d and 52d in order to obtain a contact area as little as possible, under the situation where the positions of both race grooves are misaligned, the ball 53 has Riding on the projections 51d and 52d occurred, causing a rapid rise in surface pressure.

Further, in order to receive the above surface pressure,
The contact noise, vibration generation and weight reduction of the counterbalance weight, which are constituted by metal parts and function as a coupling, have a problem that it is difficult to reduce the body diameter.

Therefore, one technical problem of the present invention is to provide a scroll type compressor in which a durable life of the mechanism itself can be extended by reducing a concentrated load in a rotation preventing mechanism including a pair of races sandwiching a ball therebetween. An object of the present invention is to provide a rotation preventing mechanism.

Further, another technical problem of the present invention is that
An object of the present invention is to provide a scroll-type compressor rotation prevention mechanism that can contribute to cost reduction by reducing the number of balls.

Another technical object of the present invention is to provide a rotation preventing mechanism for a scroll compressor capable of reducing vibration noise and reducing the size.

Still another object of the present invention is to provide a scroll compressor having the above-mentioned scroll compressor rotation prevention mechanism.

[0019]

According to the present invention, the fixed spiral member and the movable spiral member, which are arranged to face each other in one axial direction and make a revolving motion relatively around the one axis, are provided. A rotation prevention mechanism for a scroll compressor, which is provided on a movable spiral member and includes at least a pair of annular members opposed to each other with a ball interposed therebetween in the one axial direction, wherein the annular member is configured to prevent rotation of the movable spiral member. Thus, a rotation preventing mechanism of the scroll compressor characterized in that the opposing surfaces are substantially in contact with each other is obtained.

Further, according to the present invention, in the rotation prevention mechanism of the scroll type compressor, the annular members each include a concave portion for accommodating the ball on an opposing surface, and a central portion of the concave portion is flat. Wherein the sum of the depths of the recessed portions of the annular members opposed to each other is substantially equal to or larger than the value of the diameter of the ball. A mechanism for preventing rotation of the compressor is obtained.

According to the present invention, in the rotation preventing mechanism for the scroll compressor, at least one of the annular members is made of resin. Can be

According to the present invention, in the rotation prevention mechanism of the scroll compressor, the annular member and the ball may be made of a metallic material containing at least one of aluminum, magnesium, and titanium, and a ceramic. A rotation preventing mechanism for a scroll compressor characterized by being made of any material is obtained.

Further, according to the present invention, in any one of the above-described rotation preventing mechanisms for a scroll type compressor, the pair of annular members may include a pair of rings and a pair of races provided on the outside of the pair of rings. A rotation preventing mechanism for a scroll compressor, which is substantially realized, is obtained.

Further, according to the present invention, in any one of the above-described rotation preventing mechanisms, a rotation preventing mechanism for a scroll compressor, wherein the annular member is formed of a race is obtained.

Further, according to the present invention, there is provided a scroll type compressor characterized by being provided with any one of the above-described scroll type compressor rotation preventing mechanisms.

[0026]

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

FIG. 1 is a diagram showing a configuration of a scroll compressor according to a first embodiment of the present invention. FIG. 2 is a sectional view showing a rotation preventing mechanism of the scroll compressor of FIG. FIG. 3 is a partially enlarged cross-sectional view of the movable race portion of the rotation preventing mechanism of FIG. FIG. 4 is a partially enlarged cross-sectional view of a fixed race portion of the rotation preventing mechanism of FIG.

Referring to FIG. 1, the scroll compressor 3
5 is a casing 101 constituting an outer shell opened at one end.
A front housing 102 provided at one end opening of the casing 101; and a crankshaft 103 provided through a protruding portion 102a of the front housing 102. Crank chamber 104 formed by casing 101 and front housing 102
Inside the fixed spiral member 1 fixed to the casing 101
05, and a movable spiral member 106 that is provided to face the fixed spiral member 105 and that makes a revolving motion relatively around the central axis of the fixed spiral member 105.
The movable spiral member 106 includes a side plate 107, a spiral body 108 provided on one surface side of the side plate, and a boss 109 formed to protrude on the other surface side of the side plate 107. Boss part 1
The eccentric bush 112 is accommodated in the housing 09. The eccentric bush 112 has a through hole 113 at its eccentric position.
Are provided, and the peripheral surface is rotatably supported via a bearing 114. Crankshaft 1
A large-diameter portion 110 is formed at the end of the crank chamber 104 at the end of the crankshaft 103. Is provided. The crank pin 111 is provided in the through hole 113 of the eccentric bush 112.
Has been inserted. The crankshaft 103 in the protruding portion 102a is supported by a bearing 115, and a seal member 116 is provided. The large diameter portion of the crankshaft 103 is supported by the front housing 102 via a bearing 117. Note that reference numeral 1
Reference numeral 19 denotes a counter balance weight for maintaining balance with respect to the movable spiral member 106 and the shaft.

Projection 102 of front housing 102
An electromagnetic clutch 120 is provided around “a”.
The electromagnetic clutch 120 includes a hollow annular rotor 1 provided around the protrusion 102 a via a bearing 118.
21 and the electromagnet device 1 provided inside the rotor 121
22 and a clutch plate 123 provided to face the outer end surface of the rotor 121.
At the center position, it is fixed to one end of the crankshaft 103 by a fixing member.

In the crank chamber 104, a rotation preventing mechanism 10 is provided around the boss 109 at the other end of the side plate 107 of the variable spiral member 106 and on the inner wall of the front housing 102.

Up to the above, it has almost the same configuration as the scroll type compressor according to the prior art. However, the scroll type compressor according to the first embodiment of the present invention is different from the conventional type in the structure of the rotation preventing mechanism.

That is, referring to FIGS. 2 to 4, the rotation preventing mechanism 10 according to the embodiment of the present invention includes the movable race 1 provided on the movable spiral member 106 and the fixed fixed to the inner wall of the front housing 102. A race 2 and a ball 3 provided between the movable race 1 and the fixed race 2 are provided. Although the ball 3 and the races 1 and 2 may be generally made of an iron-based material, in the first embodiment of the present invention, they are made of a material having a lower specific gravity than the iron-based material. In this case, examples of the material include aluminum, ceramics, magnesium, and titanium.

Referring to FIG. 2 and FIG. 3, the movable race 1
Is formed of a plate body having an annular shape, and is provided with a concave portion 5 forming a circular ball transfer groove on one surface of the plate surface 1 by embossing. This hollow portion 5 has a round peripheral portion,
The bottom is formed flat. The other plate surface of the movable race 1 is formed with a protrusion 6 by embossing, which is a protrusion corresponding to the recess of the recess 5 when the recess 5 is formed.

Referring to FIG. 2 and FIG.
In the same manner as shown in FIG. 3, a circular concave portion 8 forming a ball transfer groove on the plate surface 7 is arranged on one surface of the plate member 7 in the circumferential direction, and on the other surface side, A protruding portion 9 corresponding to the concave portion 8 is formed. Similarly, the recess 8 has a round shape at the periphery and a flat bottom.

In the rotation preventing mechanism 10 shown in FIG.
The pair of movable races 1 and the fixed races 2 are in contact with each other on the plate surfaces 4a and 7a, and have a structure in which there is no gap in the axial direction except for the concave portions 5 and 8, which are ball receiving portions. .

The recesses 5 provided in both races 1 and 2
The total value of the depths R1 and R2 at 8 is substantially the same as the diameter of the ball 3 or slightly larger than the diameter of the ball 3.

As described above, in the rotation preventing mechanism according to the first embodiment of the present invention, the axial load of the movable spiral member 106 is received by the wide flat portions of the races 1 and 2 and the rotation preventing load is reduced. , Ball 3, race 1 and hollow 5,
8 to receive. Therefore, since the contact surface pressure between the ball 3 and the races 1 and 2 can be reduced, the conventional central projection for increasing the contact area is abolished, and even when the races are misaligned with the groove positions of both races, a sudden shift occurs. There is no increase in surface pressure. Further, the contact surface pressure between the ball 3 and the races 1 and 2 can be reduced, and the coupling contact noise (vibration) can be reduced.

As described above, in the first embodiment of the present invention, the axial load and the rotation preventing load which greatly affect the life of the rotation preventing mechanism are dispersed, and the local load applied to the ball 3 and the races 1 and 2 is dispersed. Surface pressure can be reduced. For this reason,
The number of balls can be reduced, thereby making it possible to reduce the cost, reduce the weight of the movable portion, reduce the weight of the counterbalance weight, and reduce the body diameter. As described above, by configuring the balls 3 and the races 1 and 2 with a material having a lower specific gravity than an iron-based material, this effect becomes more remarkable.

Also, in the race, since there is no climbing of the center projection of the ball 3, there is no sharp rise due to the misalignment of the two races.

FIG. 5 is a diagram showing a configuration of a scroll compressor according to a second embodiment of the present invention. FIG. 6 is a cross-sectional view showing a rotation preventing mechanism of the scroll compressor of FIG. FIG. 7 is a partially enlarged sectional view of the movable race portion of the rotation preventing mechanism of FIG. FIG. 8 is a partially enlarged cross-sectional view of a fixed race portion of the rotation preventing mechanism of FIG.

Referring to FIG. 5, the scroll type compressor 40 according to the second embodiment is different from the scroll type compressor 10 according to the first embodiment in that the scroll type compressor 40 is different from the scroll type compressor 10 of the first embodiment except that the rotation prevention mechanism 20 is different. It has the same configuration as that of the embodiment.

That is, referring to FIGS. 6 to 8, the rotation preventing mechanism 20 according to the second embodiment of the present invention is fixed to the movable race 11 provided on the movable spiral member 106 and the inner wall of the front housing 102. A fixed race 12 and the ball 3 provided between the movable race 11 and the fixed race 12. The movable race 11 and the fixed race 12 are made of a resin such as an engineering plastic or a super engineering plastic. For this reason, the races 11 and 12 are different from the shapes of the races 1 and 2 of the first embodiment in the sense of compensating for the lack of strength due to the resin, and are provided with flesh.

Referring to FIG. 6 and FIG.
Reference numeral 1 denotes a plate having an annular shape, and a circular recess 14 forming a ball transfer groove on one surface of the plate 13. The recess 14 has a rounded side wall as a peripheral portion and a flat bottom. The other side of the plate 13 is flat.

Referring to FIG. 6 and FIG.
Similarly, a circular recess 17 that forms a ball transfer groove in the plate 16 is arranged on one surface of the plate 16 so as to be spaced apart in the circumferential direction.

In the rotation preventing mechanism 20 shown in FIG.
The pair of movable races 11 and fixed races 12
And 18, there is a structure in which there is no gap in the axial direction except for the concave portions 14 and 17 which are the ball accommodating portions, that is, the sum of the depths r1 and r2 of the concave portions 14 and 17 is The diameter of the ball 3 is substantially equal to or slightly larger than the diameter of the ball 3. The axial load of the movable spiral member is received by a wide flat portion of both races 11 and 12, and the rotation preventing load is received by the recessed portions 14 and 17 of the ball 3 and races 11 and 12. As a result, since the contact surface pressure between the ball 3 and the races 11 and 12 can be reduced, the conventional center projection for increasing the contact area is abolished, and when the groove position and the misalignment of the races 11 and 12 are misaligned. However, no sudden increase in surface pressure is caused.

Further, since the contact surface pressure between the ball 3 and the races 11 and 12 is reduced and the races 11 and 12 are made of resin, the coupling contact noise (vibration) is reduced, and the counterweight is reduced due to the weight reduction by resin. Narrow weight,
The size can be reduced.

As described above, the rotation preventing mechanism according to the second embodiment of the present invention disperses the axial load and the rotation preventing load, which greatly affect the life of the mechanism, and
And the contact pressure on the races 11 and 12 can be reduced, and the ball 3
And the weight of the movable part, the weight of the counterbalance weight, and the body diameter can be reduced. Further, since there is no climbing of the ball 3 at the center projection, there is no sharp rise due to misalignment of the races 11 and 12. Further, by adopting resin parts as the races 11 and 12, it is possible to reduce the contact noise (vibration) between the parts and reduce the body diameter by narrowing the counterbalance weight.
In the present embodiment, both races 11 and 12 are made of resin, but only one of them is made of resin, and the other is made of another material such as aluminum, ceramics, magnesium, and titanium. You may. Further, the ball 3 can be made of resin.

FIG. 9 is a view showing a scroll type compressor according to a third embodiment of the present invention. FIG. 10 corresponds to FIG.
It is sectional drawing which shows the rotation prevention mechanism of the scroll compressor of FIG.

The scroll compressor 45 according to the third embodiment shown in FIG. 9 is different from the scroll compressors 35 and 40 according to the first and second embodiments shown in FIGS. It has the same configuration except that the configuration of the rotation preventing mechanism is different, and therefore the description thereof is omitted.

The rotation preventing mechanism 30 of the scroll type compressor according to the third embodiment shown in FIGS. 9 and 10 comprises a fixed ring 2 between a pair of fixed races 24 and a movable race 23.
2 and a movable ring 21, and ball receiving holes 25 and 26 for receiving the balls 3 of the fixed ring 22 and the movable ring 21. These ball receiving holes 25, 2
6 has the same shape as that of the ball accommodating portion of the second embodiment except for the bottom portion. In addition, the ball receiving hole 2
One surface of the fixed race 24 and the movable race 23 provided in contact with the outer sides of the balls 5 and 26 serve as the bottoms of the ball receiving holes 25 and 26, that is, the ball transfer surfaces 23a and 24a.

The fixed ring 22 and the movable ring 21
Are the facing surfaces 22a, 21a as in the second embodiment.
Are in contact with each other, and the ball receiving holes 25 and 26
Is equal to the diameter of the ball 3 or
Is formed to be larger than the diameter.

Therefore, the third embodiment has the same effect as the second embodiment.

[0053]

As described above, according to the present invention,
In a rotation preventing mechanism including a pair of races sandwiching a ball therebetween, a rotation preventing mechanism for a scroll compressor capable of extending a durable life of the mechanism itself by reducing a concentrated load can be provided.

Further, according to the present invention, it is possible to provide a rotation preventing mechanism for a scroll type compressor which can contribute to cost reduction by reducing the number of balls.

Further, according to the present invention, it is possible to provide a rotation preventing mechanism of a scroll type compressor which can reduce vibration noise and reduce the size by employing resin.

Further, according to the present invention, it is possible to provide a scroll compressor having the above-mentioned advantages and having a rotation preventing mechanism of the scroll compressor.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a scroll compressor according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a rotation preventing mechanism of the scroll compressor of FIG.

FIG. 3 is a partially enlarged sectional view of a movable race of the rotation preventing mechanism of FIG. 2;

FIG. 4 is a partially enlarged sectional view of a fixed race of the rotation preventing mechanism of FIG. 2;

FIG. 5 is a diagram showing a configuration of a scroll compressor according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a rotation preventing mechanism of the scroll compressor of FIG.

FIG. 7 is a partially enlarged sectional view of a movable race of the rotation preventing mechanism of FIG. 6;

FIG. 8 is a partially enlarged sectional view of a fixed race of the rotation preventing mechanism of FIG. 6;

FIG. 9 is a sectional view showing a scroll type compressor according to a third embodiment of the present invention.

FIG. 10 is a sectional view showing a rotation preventing mechanism of the scroll compressor of FIG. 9;

FIG. 11 is a cross-sectional view showing an example of a conventional scroll compressor.

FIG. 12 is a sectional view showing the rotation preventing mechanism of FIG. 11;

FIG. 13 is a front view of the movable race 51 of FIG.

FIG. 14 is a partial sectional view of the movable race of FIG.

FIG. 15 is a front view showing the fixed race of FIG. 12;

FIG. 16 is a partial sectional view of FIG.

FIG. 17 is a cross-sectional view showing another example of the conventional scroll compressor.

FIG. 18 is a sectional view showing a rotation preventing mechanism of the scroll compressor of FIG.

[Explanation of symbols]

1, 11, 23, 51 Movable race 2, 12, 24, 52 Fixed race 3, 53, 63 Ball 5, 8, 14, 17 Indentation 6 Projection 7 Plate surface 10, 20, 30, 50, 60 Rotation prevention Mechanism 13, 16 Plate body 25, 26 Ball receiving hole 35, 40, 45, 100, 130 Scroll compressor 51a Ball transfer groove 51b Projection 51c Fixing hole 52a Ball transfer groove 52b Projection 52c Fixing hole 101 Casing 102 Front housing 102a projecting portion 103 crankshaft 104 crankcase 105 fixed spiral member 106 movable spiral member 107 side plate 108 spiral body 109 boss portion 110 large diameter portion 111 crankpin 112 eccentric bush 113 through hole 114 bearing 115 bearing 116 seal member 117 bearing 11 Bearing 119 counter balance weight 120 electromagnetic clutch 121 rotor 122 electromagnetic device 123 clutch plate

Claims (7)

[Claims] 1. A fixed spiral member and a movable spiral member which are arranged to face each other in one axial direction and perform a revolving motion relatively around the one axis, and are provided on the movable spiral member among the fixed spiral members and the movable spiral member. In a rotation prevention mechanism of a scroll compressor that includes at least a pair of annular members opposed to each other with a ball interposed therebetween and prevents rotation of the movable spiral member, the annular members are substantially in contact with each other. A rotation prevention mechanism for a scroll compressor. 2. The rotation preventing mechanism for a scroll compressor according to claim 1, wherein the annular members each have a recess for accommodating the ball on an opposing surface, and a central portion of the recess is flat. Wherein the sum of the depths of the recessed portions of the annular members opposed to each other is substantially equal to or larger than the value of the diameter of the ball. Rotation prevention mechanism. 3. A rotation preventing mechanism for a scroll compressor according to claim 1, wherein at least one of said annular members is made of resin. 4. The rotation preventing mechanism for a scroll type compressor according to claim 1, wherein the annular member and the ball are made of a metal material containing at least one of aluminum, magnesium, and titanium, and a ceramic. A rotation preventing mechanism for a scroll compressor, which is made of any material. 5. A rotation preventing mechanism for a scroll type compressor according to claim 1, wherein said pair of annular members are a pair of rings and a pair of rings provided outside said pair of rings. A rotation preventing mechanism for a scroll compressor, which substantially comprises a race. 6. A rotation preventing mechanism for a scroll type compressor according to claim 1, wherein said annular member is formed of a race. . 7. A scroll compressor comprising the scroll compressor rotation prevention mechanism according to claim 1.