JPH0353030Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention provides a drive member whose central axis has a radius of R.
Improvements in the rotation prevention mechanism of a device, such as a scroll-type fluid device, which has a driven member that is driven in a circular orbit, and which needs to be prevented from rotating during the circular orbital motion. Regarding.

[Prior Art] A scroll-type compression device will be described as the most common example of this type of device.

This device prepares two scroll members with spiral bodies fixed on a single plate, and overlaps them by interlocking them with the angles of both spiral bodies shifted.
With one scroll member fixed and the other movable, the circular orbital motion of the movable scroll member causes a volume reduction as the closed fluid pocket formed between both scroll members moves toward the center. It compresses fluid by tightening it.
When the movable scroll member moves in a circular orbit, it is necessary to prevent the movable scroll member from rotating itself.

An example of such a rotation prevention mechanism is U.S. Pat.
An example of its application will be described with reference to FIG. 1, which shows a recently proposed scroll compressor in cross section.

In the figure, this compressor has a compressor housing 10 consisting of a front end plate 11 and a cup-shaped casing 12 installed therein.

The front end plate 11 is connected to the housing 1
The main shaft 14 is rotatably supported in the through hole 111 through a ball bearing 13 through a through hole 111 whose center is on the central axis of the main shaft. Further, the front end plate 11 has a sleeve portion 15 projecting forward so as to surround the outer periphery of the main shaft 14, and a shaft seal 16 is disposed within the sleeve portion 15. Further, an electromagnetic clutch device 17 is disposed on the outer periphery of the sleeve portion 15, and rotational motion from an external drive source is transmitted to a pulley 171 of the electromagnetic clutch device 17 via a V-belt (not shown) to excite the clutch device 17. Transmission of rotational motion to the main shaft 14 is controlled by controlling the energization of the coil 172. The front end plate 11 is fixed by bolts or the like so as to close the front end opening of the cup-shaped casing 12, and the joint surface thereof is sealed by an O-ring 18. The sleeve portion 15 is also fixed onto the end surface of the front end plate 11 with bolts or the like, and the joint surface is sealed with an O-ring 19.

A fixed scroll member 20, a movable scroll member 21, a movable scroll member drive mechanism, and a rotation prevention mechanism 22 are contained in the cup-shaped casing 12 whose opening is closed by the front end plate 11.
is installed.

Here, the fixed scroll member 20 generally includes a side plate 201 and a spiral body 202 fixed on one surface of the side plate so that its center is eccentric from the center of the side plate by a distance Ror/2 (where Ror is the radius of the circular orbit of the movable scroll member). It is composed of a leg portion 203 provided on the side plate 201 on the opposite side to the spiral body 202,
The leg portion 203 is fixed onto the inner wall of the bottom portion 121 by a bolt 31 which penetrates the bottom portion 121 of the cup-shaped casing 12 from the outside of the cup-shaped casing 12 and is screwed into the leg portion 203 . Also, the cup-shaped casing 1
The side plate 201 of the fixed scroll member 20 fixed in the cup-shaped casing 12 forms a space inside the cup-shaped casing 12 with a suction chamber 25 by sealing between its outer peripheral surface and the inner wall surface of the cup-shaped part 20 with an O-ring 32. It is partitioned into a discharge chamber 26. Furthermore, the side plate 201
A communication hole 204 is bored in the center of the scroll member to communicate the discharge chamber 26 with the sealed space formed between the scroll members.

The movable scroll member 21 is composed of a side plate 211 and a spiral body 212 fixed on one side of the side plate so that its center is offset by a distance Ror/2 from the center of the side plate. It is engaged with the body 202 with an angular deviation of 180°. Furthermore, the movable scroll member 21 is connected to a drive mechanism and a rotation prevention mechanism, which will be described later.
It revolves around the circular orbit of Ror and performs the fluid compression operation described above.

Here, the radius Ror of the circular orbit is generally given by (pitch of the spiral body) - 2 x (wall thickness of the spiral body)/2. Furthermore, the movable scroll member 21 is arranged such that the center of the spiral body 212 of the movable scroll member 21 is separated from the center of the spiral of the spiral body 202 of the fixed scroll member 20 by a distance Ror,
The movable scroll member 21 is rotated by the rotation of the main shaft 14.
will revolve on a circular orbit with radius Ror.

As a result, a line contact part is formed between both spiral bodies, and this line contact part moves toward the center along the spiral body surface, and as a result, the fluid pocket moves toward the center of the spiral body while decreasing its volume. do.

Therefore, the housing 10 is supplied from the external fluid circuit through the suction port provided on the outer periphery of the housing 10.
The fluid that has flowed into the suction chamber 25 inside is taken into the fluid pocket from the outer end of both spiral bodies, and the compressed fluid passes from the fluid pocket at the center of both spiral bodies to the discharge chamber 26 through the communication hole 204. From there, it flows out into the peripheral fluid circuit via a discharge port provided on the housing 10.

Next, the drive mechanism of the movable scroll member will be explained with reference to FIG. 2 as well as FIG. 1.

A large diameter portion 141 is formed at the inner end of the main shaft 14 that passes through the through hole 111 of the front end plate 11, and the ball bearing 13 has the large diameter portion 141 disposed in the through hole 111 of the front end plate 11. It is supported by Also, large diameter part 1
A drive pin 142 is provided on the tip end surface of the shaft 41 at a position eccentric from the center so as to protrude in the axial direction.

On the other hand, the spiral body 2 of the movable scroll member 21
An annular boss 213 is formed on the side plate 212 on the opposite side to the surface on which the ring 12 is fixed. Here, the center of the annular boss 213 is aligned with the center of the side plate 211. A push 27 in the form of a thick disk or short shaft is fitted into the boss 213 and rotatably supported via a needle bearing 28 . The bush 27 is integrated with a disc-shaped balance weight 2 extending in the radial direction.
71, and the large diameter portion 1 of the main shaft 14.
has an axial hole 272 on the surface opposite to 41,
The aforementioned drive pin 142 is fitted into the hole 272 via the needle bearing 29.

Therefore, the movable scroll member 21 is rotatably supported on the drive pin 142. Note that 30 and 143 are balance weights for canceling the mechanical imbalance caused by the circular orbit movement of the balance weight 271 and the movable scroll member 21. Further, the scroll member 21 is 22 in FIG.
Movement in the rotational direction is prevented by a rotation prevention mechanism shown in .

Here, this rotation prevention mechanism will be explained with reference to FIG. 3, which is an exploded view, in addition to FIG. 1.

The rotation prevention mechanism 22 includes a movable scroll member 21
A ring-shaped fixing race 22 is disposed on the outer circumference of the boss 213 near the front end plate 11 and has its outer circumferential surface joined to the inner wall surface of the cup-shaped portion 12 to abut against the end surface of the front end plate 11.
1, and a fixing ring 222 abutting the end face of the fixing race 221 so as to cover it, and these are fixed to the end face of the front end plate 11 by pins 223. On the other hand, the boss 21 near the side plate 211 of the movable scroll member 21
3 has a ring-shaped movable race 214 on the end face opposite to the spiral body 212 of the side plate 211, and covers the movable race 214 with a slight gap between it and the end face of the fixed ring 222. As shown in FIG.

As shown in FIG.
5 and the fixed ring 222, a plurality of pockets 215a and 222a are perforated in the axial direction at positions where they overlap each other when both rings are centered and overlapped, and a ball element 224 is held between the opposing pockets. ing.

Now, the rotation prevention effect will be explained with reference to FIG. 4, which shows the relationship between the movable ring and the fixed ring as seen from the movable scroll member side.

The rotation is prevented by the pocket 22 of the fixing ring 222.
The edge of 2a and the pocket 215 of the movable ring 215
This is done by sandwiching the ball element 224 with the edges of a. That is, when the movable scroll member is driven counterclockwise in the figure, the movable ring 215 also moves in a circular orbit so that its center axis draws a circle with radius Ror, but the movable scroll member also moves in the same direction due to the reaction force of the compressive force. Because rotational force is generated, the movable ring 2
It attempts to rotate counterclockwise around the central axis of No. 15. However, the nine ball elements 2 on the right side of the figure
24 is sandwiched between the edge of the pocket 222a of the fixed ring 222 and the edge of the pocket 215a of the movable ring 215, the movable ring 215 cannot rotate, thereby preventing the movable scroll member from rotating. Ru. In the illustrated state, the center of the movable ring 215 is at the uppermost position in the figure, and the rotation blocking force distribution is as f _C1 to f _C4 , with the ball element closest to the right in the figure making the largest contribution. The nine ball elements 224 on the left half of the figure, which become smaller as they move away from each other, do not serve to prevent rotation. However, the pressure applied in the axial direction of the movable scroll member due to the reaction force of the compressive force is thrust supported by the fixed race 221 via the movable race 214 and all the ball elements 224. Therefore, the inner diameter and outer diameter of the movable race 214 and the fixed race 221 may be large enough to secure the transfer area of the ball element 224.

Therefore, as shown in FIG.
4 and the diameter of the fixed race 221 to the ball element 224.
It is also possible to reduce the diameter to a diameter sufficient to secure the transfer area, and fix only the movable ring 215 and fixed ring 222 with pins 216 and 223, respectively.

[Problem to be solved by the invention] However, the pin holes 215b and 222b, which are drilled to allow the pins 216 and 223 to pass through the rings 215 and 222, are straight holes, as is clear from FIG. , ball element 2
As the rings 215 and 222 move slightly with the movement of the pin 24, the pins 216 and 223 cause a grinding motion, and the pins 216 and 223 move into the pin hole 215.
There was a risk that the pins 216, 223 would come off due to the force being applied in the direction of the pins 216, 222b.

In order to eliminate this phenomenon, the diameter of the pin hole provided in the front end plate or the movable scroll member into which the pin is inserted is adjusted so that both rings 215 and 2
22, and the pin holes 216 and 223 are press-fitted tightly, or the pins are not split spring pins with straight openings, but have large corrugated spring pins. However, even such a structure is not sufficient to prevent the pin from moving in the direction of coming out of the pin hole.

In addition, in order to prevent such slight movement of the ring, it is possible to fix the ring by caulking, but caulking is difficult, especially when fixing the ring to the front end plate side, so it is not recommended. Not only is it impossible to fix the ring, but when fixing it, it is necessary to fix the ring with some kind of positioning structure and then process it, and the simplest and most accurate positioning structure is to use a pin.

Therefore, the present invention is an attempt to improve such a rotation prevention mechanism, and an object of the present invention is to easily and reliably fix the ring constituting the rotation prevention mechanism.

[Means for Solving the Problems] According to the present invention, there is provided a movable scroll member to be driven so as to draw a circular orbit with a preset radius, and a A scroll including a drive mechanism coupled to a movable scroll member, a front end plate supporting and fixing the drive mechanism, and a mechanism for preventing rotation of the movable scroll member during circular orbital movement of the movable scroll member. In the mold fluid device, the rotation prevention mechanism has a plurality of circular pockets and a ring hole through which the fixing member passes,
and includes a fixed ring abutting the front end play, a movable ring abutting the movable scroll member, and a ball element held between pockets of both rings, the front end play and the hole of the ring of the movable scroll member. A hole having an inner wall surface is formed at a location opposite to the hole, and a substantially cylindrical locking member for locking the fixing member in the hole is formed in the hole, and the fixing member is attached to the hole. a locking flange portion having a diameter larger than that of the locking flange portion and a large diameter portion 2 having a diameter corresponding to the hole.
41, and a small diameter portion 2 having a smaller diameter than the large diameter portion.
43, and a shoulder formed between the large diameter part and the small diameter part, and the substantially cylindrical locking member has a cylindrical part 232 forming a predetermined hollow part;
It has an inner flange part 232 extending in the direction of the center of the circle on one end surface side of the cylindrical part, and an outer flange part 231 extending in the radial direction of the circle on the other end side of the cylindrical part,
When the fixing member is inserted into the locking part,
The small diameter part is fitted into the hollow part of the cylindrical part,
The shoulder portion is in contact with one end surface of the cylindrical portion, the inner flange portion is folded back within the hollow portion of the cylindrical portion by pressure from the small diameter portion, and the outer flange portion is folded within the hole into the cylindrical portion. The rings are bent so as to be substantially flush with the outer peripheral surface and in pressure contact with the inner wall surface of the hole, thereby fixing the fixing member to the hole via the locking member, thereby fixing both rings. A rotation prevention mechanism for a scroll-type fluid device characterized by being fixed is obtained.

[Embodiments] The present invention will be described below with reference to drawings showing embodiments.

Note that the same members as those described in FIGS. 1 to 6 are designated by the same reference numerals, and the description thereof will be omitted.

At least one through hole 215b, 222b is bored in the portion of the movable ring 215 and the fixed ring 222 that directly contact the movable scroll member 21 or the front end plate 11.
Holes 211a and 11a having the same diameter as the through holes are formed in the inner wall surfaces of the side plate 211 of the movable scroll member 21 and the front end plate 11 facing the through holes 215b and 222b.

As shown in FIG. 8, the holes 211a and 11a have an external flange portion 231 extending radially outward on one end surface, and a plurality of internal flange portions 231 extending radially inward on the other end surface opening. A cylindrical locking member 23 having a locking piece 232 serving as a flange portion.
is inserted.

On the other hand, the through holes 215b of the rings 215 and 222,
Fixing member 24 disposed to penetrate through 222b
are through holes 215b, 2 of rings 215, 222
22b, a locking flange portion 242 extending radially outward from one end surface of the large diameter portion 241, and a small diameter portion 243 having a smaller diameter than the large diameter portion. 241 part and small diameter part 243
and a shoulder formed between.

Here, the rings 215 and 222 are attached to the movable scroll member 21 or the front end plate 11.
We will explain the case where it is fixed to .

First, the locking member 23 has its flange portion 231
holes 211a, 11a so that they can be bent
The locking member 23 is fitted into the hole 21 due to the force that tends to open the flange portion 231 outward.
1a, 11a.

In addition, a fixing member 24 passing through the through hole of the ring
The locking flange portion 242 comes into contact with the side surface of the ring to prevent further movement in the axial direction, and the protruding portion 243 prevents the locking member 23 from moving further in the axial direction.
The locking piece 232 is fitted into the opening so as to be pushed open. Therefore, the fixing member 23 is attached to the protrusion 24
3 and the locking piece 232 prevent movement in the axial direction.

That is, with reference to FIG. 7, the fixing member 24
When engaged with the locking member 23 fitted into the hole 211a, the small diameter portion 243 is fitted into the hollow portion of the cylindrical portion 233, and the shoulder portion is brought into contact with one end surface of the cylindrical portion. The locking piece 232 is folded back within the hollow portion of the cylindrical portion 233 by pressure from the small diameter portion 243 .
The outer flange portion 231 is bent within the hole 211a so as to be substantially flush with the outer peripheral surface of the cylindrical portion and in pressure contact with the inner wall surface of the hole 211a.

According to the ring fixing structure described above, the fixing member performs a sliding motion due to the slight movement of the ring and tries to move in the direction of coming out of the hole, but the fixing member does not engage with the locking member fitted into the hole. Since they are assembled in such a state that the fixing members are assembled together, movement of the fixing member can be suppressed.

Note that the flange portion 231 of the root locking member is not formed over the entire circumference of the end surface as shown in FIG. 8, but is formed with a slit 233 or partially formed as shown in FIG. The flange portion may have good flexibility as long as it can be locked.

As described above, the present invention includes a fixed ring and a movable ring that constitute a rotation prevention mechanism, a fixing member arranged to pass through the rings, and a locking member fitted into a hole formed in a front end plate and a movable scroll member. Since the fixing member is fixed by engagement with the ring, even if the fixing member receives a force in the direction of coming out of the hole of the ring while the device is being driven, this movement can be reliably suppressed and the ring can be fixed.

Further, since the movement of the fixing member is reliably suppressed, the fixing member can be used for positioning the ring and also fix the ring, so that the rotation prevention mechanism can be easily assembled.

Here, the fixing member and the locking member are engaged by fitting the protrusion of the fixing member into the opening of the locking member, and further locking the protrusion with a locking piece formed in the opening of the locking member. Although the present invention has been described with reference to an embodiment of the configuration, as shown in FIGS. The same effect as described above can also be obtained by forming a threaded portion 23a in both parts and screwing them together to engage the fixing member 24 and the locking member 23.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a scroll compressor to which the present invention is applied, Fig. 2 is an exploded perspective view of the drive mechanism used in the scroll compressor shown in Fig. 1, and Fig. 3 is an exploded perspective view of the drive mechanism used in the scroll compressor shown in Fig. 1. FIG. 4 is an exploded perspective view of a rotation prevention mechanism that also serves as a thrust bearing. In order to explain the principle of rotation prevention, the relationship between the movable ring, the fixed ring, and the ball element is shown in a sectional view taken along the - line in FIG. 1. Figure 5 is a cross-sectional view showing another conventional example of the fixing structure of the movable ring and fixed ring, and Figure 6 is a cross-sectional view illustrating the shape of the pin hole provided in the ring used in Figure 5. Fig. 7 1 is a sectional view for explaining the configuration in which the ring is fixed according to the embodiment of the present invention, Fig. 7 2 is a partially enlarged view of the locking part in the embodiment of the present invention, and Fig. The figure is a plan view of the locking member used in Fig. 7, and Fig. 9 is a plan view of the locking member used in Fig. 8.
10 is a front view of the fixing member used in FIG. 7, FIGS. 11 and 12 are plan views showing another embodiment of the locking member, and FIG. 13 is a front view of the fixing member used in FIG. 7. 14 is a plan view of the locking member shown in FIG. 13; and FIG. 15 is a sectional view of the locking member. , FIG. 16 is a front view of the fixing member used in FIG. 13. 11...Front end plate, 11a...
Hole, 20... Fixed scroll member, 21... Movable scroll member, 22... Rotation prevention mechanism, 214
...Movable lace, 215...Movable ring, 221
... Fixed race, 222 ... Fixed ring, 224
... Ball element, 23 ... Locking member, 231 ...
Outer flange part, 232... Locking piece (inner flange part), 233... Cylindrical part, 24... Fixing member,
241...Large diameter section, 243...Small diameter section.

Claims (1)

[Claims for Utility Model Registration] A movable scroll member to be driven in a circular orbit with a preset radius, and a movable scroll member coupled to the movable scroll member to give the movable scroll member the circular orbit motion. In a scroll-type fluid device including a drive mechanism, a front end plate supporting and fixing the drive mechanism, and a mechanism for preventing rotation of the movable scroll member during circular orbital movement of the movable scroll member, the rotation The blocking mechanism has a plurality of circular pockets and a ring hole through which the fixing member passes, and includes a fixed ring that abuts the front end plate, a movable ring that abuts the movable scroll member, and a clamping member between the pockets of both rings. A hole having an inner wall surface is formed at a portion of the front end play and the movable scroll member facing the hole of the ring, and the fixing member is locked in the hole. A substantially cylindrical locking member is provided in the hole, and the fixing member includes a locking flange portion having a diameter larger than the hole, a large diameter portion 241 having a diameter corresponding to the hole, and a large diameter portion 241 having a diameter corresponding to the hole. and a shoulder formed between the large diameter part and the small diameter part, and the substantially cylindrical locking member has a predetermined hollow part. It has a cylindrical portion 232 to be formed, an inner flange portion 232 extending in the direction of the center of the circle on one end side of the cylindrical portion, and an outer flange portion 231 extending in the radial direction of the circle on the other end side of the cylindrical portion. When the fixing member is fitted into the locking part, the small diameter part is fitted into the hollow part of the cylindrical part, the shoulder part is brought into contact with one end surface of the cylindrical part, and the inside The flange portion is folded back within the hollow portion of the cylindrical portion by pressure from the small diameter portion, and the outer flange portion is in pressure contact with the inner wall surface of the hole, being substantially flush with the outer peripheral surface of the cylindrical portion within the hole. A rotation prevention mechanism for a scroll-type fluid device, wherein the fixing member is fixed to the hole through the locking member, thereby fixing both the rings.