JP5285339B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor in which a compression mechanism and its drive section are lubricated with a mist-like lubricating oil dissolved in a refrigerant gas.

  In vehicle air conditioners and transport refrigeration systems, etc., the lubricating oil is dissolved in the refrigerant gas, and the required sliding parts of the compressor are lubricated by the mist-like lubricating oil circulated in the refrigeration cycle along with the refrigerant. A compressor is used. In a scroll compressor used for such a refrigeration and air conditioner, a crank pin provided at the shaft end of a crankshaft that orbits the orbiting scroll member is generally a boss provided on the back surface of the end plate of the orbiting scroll member. It is set as the structure couple | bonded with a part via a drive bush and a slewing bearing.

  In the case of a compressor that is lubricated with a mist-like lubricating oil dissolved in a refrigerant gas, it is normal that it does not have an aggressive oil supply mechanism (pump mechanism). Therefore, as in the case of the scroll compressor described above, in a configuration in which a swivel drive unit such as a crankpin, a drive bush, or a swivel bearing is provided in a bag-path-like boss, the refrigerant gas flows through the bearing clearance of the swivel bearing. Since it is difficult for the refrigerant gas to rotate just by being circulated and the mist-like lubricating oil is not easily supplied by itself, the orbiting drive part of the orbiting scroll member composed of a crankpin, a drive bush, an orbiting bearing, etc. under severe conditions There was a risk of poor lubrication due to insufficient refueling.

  Therefore, as shown in Patent Document 1, an axial through hole is provided in the drive bush, and a refrigerant gas containing mist-like lubricating oil is actively circulated in the boss part through the through hole, whereby the inside of the boss part is circulated. There has been proposed one that improves the lubrication performance of the orbiting scroll member provided on the orbiting drive portion so that poor lubrication is not caused even under severe conditions.

JP-A-8-49681

  However, as shown in the above-mentioned Patent Document 1, in the configuration in which the through hole in the axial direction is provided in the drive bush, a through hole having a small diameter must be drilled in the drive bush having a thick dimension in the axial direction. . Such processing of the through hole is not preferable in terms of work, for example, the tool is easily damaged, and there is a problem that productivity is lowered. Therefore, even if the lubrication performance can be improved, there are difficulties as described above for practical use, and improvement is necessary.

  The present invention has been made in view of such circumstances, and can efficiently lubricate the orbiting drive portion of the orbiting scroll member with a small amount of enclosed lubricating oil to improve durability and reliability. It is an object of the present invention to provide a scroll compressor with high productivity.

In order to solve the above problems, the scroll compressor of the present invention employs the following means.
That is, a scroll compressor according to the present invention is disposed in a housing and is rotatably supported in the housing, including a compression mechanism including a pair of fixed scroll members and orbiting scroll members that are engaged with each other to form a compression chamber. A crank pin provided at the shaft end of the orbiting scroll member is coupled to a boss portion on the rear surface of the end plate of the orbiting scroll member via a drive bush and a orbiting bearing, thereby rotating the orbiting scroll member to rotate and drive the orbiting scroll member. The drive bush is integrally provided with a balance weight having a rising portion formed in an arc shape on an outer peripheral portion, and a refrigerant gas containing mist-like lubricating oil sucked into the housing Around the orbiting drive portion of the orbiting scroll member by being guided into the boss portion through the bearing clearance of the bearing In the scroll compressor to be lubricated, an oil supply groove for guiding a refrigerant gas containing mist-like lubricating oil is provided in the boss portion along the axial direction on the outer peripheral surface of the drive bush, and the groove is formed on the drive bush. a surface of the rotating direction side than the range for receiving the bearing load of the outer peripheral surface of it are provided on the inner peripheral surface opposite to the position of the raised portion which is formed in an arc shape on the outer peripheral portion of the balance weight It is characterized by.

According to the present invention, the drive bush constituting the orbiting scroll member of the orbiting scroll member and the boss portion to which the crank pin is coupled via the orbiting bearing are provided on the outer peripheral surface of the drive bush in addition to the bearing clearance of the orbiting bearing. A refrigerant gas containing mist-like lubricating oil can be introduced through the groove for oil supply. Thereby, the oil quantity of the mist-like lubricating oil guided into the boss | hub part can be increased, and more aggressive oil supply can be implement | achieved. Therefore, efficient lubrication can be achieved even if the amount of lubricating oil is reduced, the reliability and durability can be improved, and the heat exchange efficiency in the heat exchanger on the refrigeration cycle side can be improved, The air conditioning capability can be improved. Further, it is only necessary to provide a groove on the outer peripheral surface of the drive bush, and the processing can be facilitated and the productivity can be improved. Moreover, the groove is a surface of a rotating direction side than the range for receiving the bearing load of the outer peripheral surface of the drive bush, an inner peripheral surface opposed to the position of the raised portion which is formed in an arc shape on the outer peripheral portion of the balance weight Therefore, the mist-like lubricating oil and the refrigerant gas flowing in the periphery thereof are collided with the inner peripheral surface of the arc-shaped rising portion of the balance weight and guided to the outer peripheral surface side of the drive bush. Of the orbiting scroll member by actively taking it into a groove provided on the surface on the rotational direction side of the outer peripheral surface receiving the bearing load and increasing the amount of mist-like lubricating oil guided into the boss portion. The lubrication performance of the turning drive unit can be improved, and its reliability and durability can be improved.

  Furthermore, in the scroll compressor according to the present invention, in any one of the scroll compressors described above, the slewing bearing is a needle bearing, and a floating bush is interposed between the needle bearing and an outer peripheral surface of the drive bush. It is characterized by being.

  When the slewing bearing is a needle bearing, providing a groove in the axial direction on the outer peripheral surface of the drive bush fitted to the inner periphery of the slewing bearing may interfere with the needle and adversely affect its life and durability. Concerned. According to the present invention, since the floating bush is interposed between the needle bearing and the outer peripheral surface of the drive bush, interference between the groove and the needle is avoided, and the life and durability of the needle bearing are reduced by the groove. There is no concern, and a mist-like lubricating oil can be guided into the boss portion by providing a groove on the outer peripheral surface of the drive bush. Therefore, it is possible to positively supply oil through the groove and improve the lubrication performance of the orbiting scroll member. At the same time, the oil supply property between the drive bush and the floating bush can be sufficiently ensured.

  Furthermore, the scroll compressor according to the present invention is characterized in that, in the scroll compressor, the groove is provided so as to extend in an axial direction from an end face of the floating bush.

  According to the present invention, since the groove is provided so as to extend in the axial direction from the end face of the floating bush, the groove is not covered by the floating bush, and the mist-like lubricating oil is reliably bossed by the groove. Can be guided into the department. Accordingly, the lubrication performance of the orbiting drive portion of the orbiting scroll member can be improved, and its reliability and durability can be improved.

  Furthermore, the scroll compressor according to the present invention is characterized in that, in any of the scroll compressors described above, the groove is provided by simultaneous molding when the material of the drive bushing is molded.

  According to the present invention, since the groove is provided by simultaneous forming at the time of forming the material of the drive bush, for example, forging or casting, it is possible to eliminate the need for additional processing for providing the groove. Therefore, even if a groove for oiling is provided in the drive bush, the processing man-hour is not increased at all, and the processing can be facilitated and the productivity can be improved as compared with the case of drilling holes.

  According to the present invention, it is possible to increase the amount of mist-like lubricating oil guided in the boss portion on the back surface of the end plate of the orbiting scroll member, and to achieve more aggressive oil supply. However, efficient lubrication can be achieved, reliability and durability can be improved, heat exchange efficiency in the heat exchanger on the refrigeration cycle side can be improved, and refrigeration and air conditioning capabilities can be improved. Further, it is only necessary to provide a groove on the outer peripheral surface of the drive bush, and the processing can be facilitated and the productivity can be improved.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
FIG. 1 shows a longitudinal sectional view of a scroll compressor 1 according to the first embodiment of the present invention, and FIG. 2 shows a sectional view of the swivel drive unit. The scroll compressor 1 has a housing 3 that constitutes its outline. The housing 3 is configured by integrally fastening and fixing a front housing 5 and a rear housing 7 with bolts 9.

  The front housing 5 and the rear housing 7 are integrally formed with flanges 5A and 7A for fastening at a plurality of positions on the circumference, for example, at four positions at equal intervals. By fastening the flanges 5 </ b> A and 7 </ b> A with bolts 9, the front housing 5 and the rear housing 7 are integrally coupled. A crankshaft (drive shaft) 11 is supported inside the front housing 5 via a main bearing 13 and a sub-bearing 15 so as to be rotatable around an axis L.

  One end side (left side in the drawing) of the crankshaft 11 is a small diameter shaft portion 11A, and this small diameter shaft portion 11A penetrates the front housing 5 and protrudes to the outside (left side in FIG. 1). As is well known, an unillustrated electromagnetic clutch, pulley, and the like that receive power are provided on the projecting portion of the small-diameter shaft portion 11A to the outside, and power is supplied from a drive source such as an engine (not shown) via a V-belt or the like. It is to be transmitted. A lip seal (or mechanical seal) 17 is installed between the main bearing 13 and the sub-bearing 15 to hermetically seal between the inside of the housing 3 and the atmosphere.

  A large-diameter shaft portion 11B is provided on the other end side (right side in the drawing) of the crankshaft 11, and the large-diameter shaft portion 11B has a crank pin 11C that is eccentric from the axis L of the crankshaft 11 by a predetermined dimension. Are provided integrally. The crankshaft 11 is rotatably provided in the front housing 5 by supporting a large diameter shaft portion 11B and a small diameter shaft portion 11A by a main bearing 13 and a sub bearing 15.

  The crank pin 11C is connected to a turning scroll member 27, which will be described later, via a drive bush 19 and a turning bearing (needle bearing) 21, and the turning scroll member 27 is turned by rotating the crankshaft 11. It is said that. The drive bush 19 is integrally formed with a balance weight 19 </ b> A for removing an unbalanced load generated when the orbiting scroll member 27 is orbitally driven and is orbited together with the orbiting scroll member 27. Yes.

  A pair of fixed scroll member 25 and orbiting scroll member 27 constituting a scroll compression mechanism (compression mechanism) 23 are incorporated in the housing 3. The fixed scroll member 25 is composed of an end plate 25A and a spiral wrap 25B standing from the end plate 25A, while the orbiting scroll member 27 is standing from the end plate 27A and the end plate 27A. And a spiral wrap 27B.

  The fixed scroll member 25 and the orbiting scroll member 27 of the present embodiment are respectively provided with stepped portions at predetermined positions along the spiral direction of the distal end surface and the bottom surface of the spiral wraps 25B and 27B. With this stepped portion as a boundary, on the wrap tip surface, the tip surface on the outer peripheral side is high in the direction of the axis L, and the tip surface on the inner peripheral side is made low. In the bottom surface, the bottom surface on the outer peripheral side is low in the direction of the axis L, and the bottom surface on the inner peripheral side is high. Thus, the spiral wraps 25B and 27B have a wrap height on the outer peripheral side higher than the wrap height on the inner peripheral side.

  The fixed scroll member 25 and the orbiting scroll member 27 are separated from each other by the orbiting radius, and the phases of the spiral wraps 25B and 27B are shifted by 180 degrees to engage with each other. It is assembled so as to have a slight gap (several tens to hundreds of microns) in the lap height direction at room temperature. Thus, as shown in FIG. 1, a pair of compression chambers 29 limited by the end plates 25A and 27A and the spiral wraps 25B and 27B are symmetrical between the scroll members 25 and 27 with respect to the scroll center. The orbiting scroll member 27 can be smoothly orbited around the fixed scroll member 25.

  The compression chamber 29 has a height in the axis L direction that is higher than the height on the outer peripheral side of the spiral wraps 25B and 27B in the circumferential direction and the wrap height direction of the spiral wraps 25B and 27B. A compression mechanism 23 capable of three-dimensional compression is configured. The tip seal members 51 and 52 for sealing the tip seal surfaces formed between the bottom surfaces of the opposing scroll members at the tip surfaces of the spiral wraps 25B and 27B of the fixed and orbiting scroll members 25 and 27. , 53, 54 are fitted into a groove provided on the tip surface.

  The fixed scroll member 25 is fixedly installed on the inner surface of the rear housing 7 with bolts 31. On the other hand, in the orbiting scroll member 27, the crank pin 11C provided on one end side of the crankshaft 11 connects the drive bush 19 and the orbiting bearing 21 to the boss portion 27C provided on the back surface of the end plate 27A. And are configured to be driven to rotate. Further, the orbiting scroll member 27 is supported by the thrust surface 5B formed on the front housing 5 on the back surface of the end plate 27A, and is a pin ring type provided between the thrust surface 5B and the back surface of the end plate 27A. The rotation preventing mechanism 33 is configured to be revolved around the fixed scroll member 25 while being prevented from rotating.

  A discharge port 25K that discharges the compressed refrigerant gas is opened at the center of the end plate 25A of the fixed scroll member 25, and a discharge reed valve 37 that is attached to the end plate 25A via a retainer 35. Is provided. Further, a seal material 39 such as an O-ring is interposed on the back side of the end plate 25 </ b> A of the fixed scroll member 25 so as to be in close contact with the inner surface of the rear housing 7. A discharge chamber 41 partitioned from the space is formed. Thereby, the internal space of the housing 3 excluding the discharge chamber 41 is configured to function as the suction chamber 43.

  A refrigerant gas returning from the refrigeration cycle is sucked into the suction chamber 43 via a suction port 45 provided in the front housing 5, and the refrigerant gas is sucked into the compression chamber 29 through the suction chamber 43. Has been. In addition, a sealing material 47 such as an O-ring is interposed on the joint surface between the front housing 5 and the rear housing 7, and the suction chamber 43 formed in the housing 3 is hermetically sealed from the atmosphere.

Below, the structure of the drive part which orbits the turning scroll member 27 by the crankshaft 11 mentioned above is demonstrated in detail with reference to FIG. 2 thru | or FIG.
The crank pin 11C is integrally provided on the large diameter shaft portion 11B of the crankshaft 11 at a position eccentric from the center of the crankshaft 11 by a predetermined dimension. The drive bush 19 fitted to the crank pin 11C is provided with an eccentric hole 19B at a position eccentric from the bush center by a predetermined dimension. The eccentric bushing 19B is fitted into the crankpin 11C, so that the drive bush 19 can be rotated around the crankpin 11C.

  A boss portion 27 </ b> C provided on the rear surface of the end plate of the orbiting scroll member 27 is rotatably fitted to the outer periphery of the drive bush 19 via an orbiting bearing (needle bearing) 21. Thus, the distance between the bush center and the crankshaft center is the orbiting radius of the orbiting scroll member 27. The turning radius is configured to be varied by rotating the drive bush 19 around the crankpin 11C and changing the distance between the center of the bush and the center of the crankshaft.

  Further, between the balance weight 19A integrated with the drive bush 19 and the large-diameter shaft portion 11B of the crankshaft 11, a projection 55 provided on the balance weight 19A side and a large size in which the projection 55 is loosely fitted. A restricting mechanism that restricts the rotation range of the drive bush 19 is provided by a restricting hole 57 provided on the radial shaft portion 11B side. The drive bush 19 and the balance weight 19A are integrally formed by forging or casting, and are finished by cutting a required portion. The balance weight 19A has an arcuate outer peripheral portion. The starting portion 19C is formed.

  All the sliding parts inside the compressor including the above-mentioned orbiting drive portion of the orbiting scroll member 27 are dissolved in the refrigerant gas and are lubricated by the mist-like lubricating oil circulated in the refrigeration cycle along with the refrigerant. The That is, the mist-like lubricating oil contained in the refrigerant gas sucked into the suction chamber 43 from the refrigeration cycle side through the suction port 45 together with the refrigerant gas, the orbiting drive portion of the orbiting scroll member 27, the thrust surface 5B, and rotation prevention. The sliding part such as the mechanism 33 and the main bearing 13 is lubricated, and the sliding part is lubricated and sucked into the compression chamber 29 to lubricate the sliding part between the fixed scroll member 25 and the orbiting scroll member 27. , Seal.

  Among the lubrication points, the crank pin 11C, the drive bush 19, the orbiting bearing (needle bearing) 21 and the like that constitute the orbiting drive portion of the orbiting scroll member 27 are provided in the bag path-like boss portion 27C as described above. Therefore, the refrigerant gas is difficult to rotate, and therefore, the mist-like lubricating oil is hardly supplied. In order to improve such an oil supply environment, in this embodiment, an oil supply groove 59 having a predetermined width and depth is provided on the outer peripheral surface of the drive bush 19 along the axial direction.

The groove 59 is, on the outer peripheral surface of the drive bush 19, than the range for receiving the bearing load is provided on the surface of the rotating direction side, the refrigerant gas and mist lubricant is configured to facilitate incorporated into groove 59 . Further, when the groove 59 is provided on the outer peripheral surface of the drive bush 19, when the slewing bearing 21 is a needle bearing, there is a concern that the needle interferes with the groove 59 and adversely affects the life and durability. For this reason, in this embodiment, the ring-shaped floating bush 61 is fitted to the outer periphery of the drive bush 19 so that the drive bush 19 and the swing bearing (needle bearing) 21 are not directly fitted.

  Further, even when the floating bush 61 is provided as described above, the groove 59 is provided extending in the axial direction from the end face of the floating bush 61 so that the groove 59 is not covered by the floating bush 61 (FIG. 1). reference). Further, the groove 59 is formed simultaneously with the molding material when the drive bush 19 is integrally forged or cast with the balance weight 19A. Further, the groove 59 is provided to face the inner peripheral surface of the rising portion 19 </ b> C provided in an arc shape on the outer peripheral portion of the balance weight 19 </ b> A formed integrally with the drive bush 19.

  Further, in order to guide the refrigerant and the mist-like lubricating oil to the space on the side of the anti-compression mechanism accommodating portion with the main bearing 13 interposed therebetween, that is, the space between the main bearing 13 and the lip seal (or mechanical seal) 17, the crankshaft 11 A through-hole 63 is provided in the large-diameter shaft portion 11B. This through-hole 63 is formed in the axial direction from the bottom of the restriction hole 57 provided in the large-diameter shaft portion 11B, and is bent in the radial direction from the middle to be opened into the space. The bearings 13 are provided so as to communicate with both side spaces.

With the configuration described above, according to the present embodiment, the following operational effects are obtained.
When a rotational driving force is transmitted from an external drive source to a crankshaft (drive shaft) 11 via a pulley, an electromagnetic clutch, etc. (not shown) and the crankshaft 11 is rotated, a drive bush 19 and a swivel are connected to a crankpin 11C of the crankshaft 11. The orbiting scroll member 27 connected via the bearing 21 is driven to revolve around the fixed scroll member 25 while being prevented from rotating by the rotation preventing mechanism 33.

  By the revolution turning drive of the turning scroll member 27, the refrigerant gas in the suction chamber 43 is sucked into the compression chamber 29 formed at the outermost side in the radial direction. The compression chamber 29 is moved to the center side while the volume is reduced in the circumferential direction and the lap height direction after being closed by suction at a predetermined turning angle position. During this time, the refrigerant gas is compressed, and when the compression chamber 29 reaches a position communicating with the discharge port 25K, the discharge reed valve 37 is pushed open and the compressed gas is discharged into the discharge chamber 41. This high-pressure refrigerant gas Is delivered to the refrigeration cycle via the discharge chamber 41.

  During the compression operation described above, the mist-like lubricating oil contained in the refrigerant gas sucked into the suction chamber 43 is combined with the refrigerant gas, the turning drive unit of the orbiting scroll member 27 disposed in the suction chamber 43, the thrust It goes around sliding parts such as the surface 5B, the rotation prevention mechanism 33, the main bearing 13 and the like, and lubricates the sliding parts. Here, not only the bearing clearance of the orbiting bearing (needle bearing) 21 but also the outer peripheral surface of the drive bush 19 is provided in the boss portion 27 </ b> C of the orbiting scroll member 27 where the orbiting scroll member 27 is provided. Refrigerant gas containing mist-like lubricating oil can also be introduced from the groove 59 for oil supply.

  For this reason, the oil quantity of the mist-like lubricating oil guided into the boss | hub part 27C can be increased, and more aggressive oil supply can be implement | achieved. Therefore, efficient lubrication can be achieved even if the amount of lubricating oil enclosed is reduced, and the reliability of the turning drive unit with respect to lubrication and the durability of the turning drive unit can be improved. In addition, since it can be efficiently lubricated with a small amount of lubricating oil, the heat exchange efficiency in the heat exchanger on the refrigeration cycle side that is obstructed by the lubricating oil can be improved, and the refrigeration and air conditioning capabilities can be improved. Furthermore, in order to improve the lubrication of the swivel drive unit, it is only necessary to provide the groove 59 on the outer peripheral surface of the drive bush 19, which can facilitate the processing and increase the productivity.

Further, a groove 59 for lubrication, than the range for receiving the bearing load of the outer peripheral surface of the drive bush 19 provided on the surface of the rotational direction, incorporating actively mist lubricating oil together with the refrigerant gas through the groove 59 as Therefore, the amount of mist-like lubricating oil guided into the boss portion 27C can be further increased. Thereby, the lubrication performance of the turning drive part of the turning scroll member 27 can be improved, and the reliability and durability can be improved.

  Further, since the floating bush 61 is interposed between the slewing bearing (needle bearing) 21 and the outer peripheral surface of the drive bushing 19, even when the needle bearing is used for the slewing bearing 21, the interference between the groove 59 and the needle. Can be avoided. For this reason, there is no concern that the life and durability of the needle bearing 21 will be reduced by the groove 59, and the groove 59 can be provided on the outer peripheral surface of the drive bush 19 to guide the mist-like lubricating oil into the boss portion 27C. Therefore, it is possible to positively supply oil through the groove 59 and improve the lubrication performance of the orbiting drive portion of the orbiting scroll member 27. At the same time, the oil supply property between the outer peripheral surface of the drive bush 19 and the inner peripheral surface of the floating bush 61 can be sufficiently ensured.

  Further, as described above, even if the floating bush 61 is provided, the groove 59 is provided so as to extend in the axial direction from the end face of the floating bush 61, so that the groove 59 is not covered by the floating bush 61. The groove 59 can reliably guide the mist-like lubricant into the boss portion 27C. Therefore, the lubrication performance of the orbiting drive portion of the orbiting scroll member 27 can be improved, and its reliability and durability can be improved.

  Further, since the groove 59 is provided on the outer peripheral portion of the balance weight 19A provided integrally with the drive bush 19 so as to oppose the inner peripheral surface of the rising portion 19C, the arc is formed by turning the balance weight 19A. The refrigerant gas containing the mist-like lubricating oil that collides with the inner peripheral surface of the starting portion 19 </ b> C and is guided to the outer peripheral surface side of the drive bush 19 can be actively taken into the groove 59. Thereby, the amount of mist-like lubricating oil guided into the boss portion 27C can be increased, and the lubricating performance of the orbiting drive portion of the orbiting scroll member 27 can be enhanced.

  Further, since the groove 59 is provided by simultaneous molding when the drive bush 19 is forged or cast-molded, additional processing for providing the groove 59 can be eliminated. Therefore, even if the oil supply groove 59 is provided in the drive bush 19, the processing man-hour is not increased at all, and the processing can be facilitated and the productivity can be improved as compared with the case of drilling holes.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
This embodiment differs in the structure of the turning bearing 21 with respect to above-described 1st Embodiment. Since other points are the same as those in the first embodiment, description thereof will be omitted.
In the present embodiment, a ball bearing or a roller bearing having an inner ring is adopted as the slewing bearing 21 instead of the needle bearing. In this case, the floating bush 61 can be omitted.

  As described above, by adopting a ball bearing, a roller bearing or the like having an inner ring as the slewing bearing 21, even if the oil supply groove 59 is provided on the outer peripheral surface of the drive bush 19, the outer side of the groove 59 is the bearing. Only by being covered by the inner ring, the groove 59 and the ball, roller or the like do not directly interfere. Therefore, even if the floating bush 61 is omitted, there is no possibility that the life and durability of the bearing will be reduced, and the number of parts can be reduced and the configuration can be further simplified.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the above-described embodiment, the scroll compressor of the type in which the crankshaft 11 protrudes to the outside and is driven by an external drive source has been described. However, the invention is similarly applied to a scroll compressor in which a motor is built in the housing. can do. Further, the scroll compression mechanism 23 provided with the stepped portions on the front and bottom surfaces of the spiral wraps 25B and 27B of the fixed scroll member 25 and the orbiting scroll member 27 has been described, but the scroll compression mechanism 23 provided with no stepped portion is described. There may be.

  Furthermore, the drive bush 19 and the balance weight 19A do not necessarily have to be integrally formed, and may be configured separately. Further, the mechanism for changing the turning radius of the orbiting scroll member 27 is not limited to the method of turning the drive bush 19 (swing method) as in the above embodiment, but can be similarly applied to the method of using the slide method. Of course.

It is a longitudinal section of the scroll compressor concerning a 1st embodiment of the present invention. It is sectional drawing of the turning drive part of the scroll compressor shown in FIG. It is a top view of the drive bush which comprises the turning drive part shown in FIG. FIG. 4 is a left side view of the drive bush shown in FIG. 3.

DESCRIPTION OF SYMBOLS 1 Scroll compressor 3 Housing 11 Crankshaft 11C Crankpin 19 Drive bush 19A Balance weight 19C Starting part 21 Slewing bearing (needle bearing)
23 Scroll compression mechanism (compression mechanism)
25 Fixed scroll member 27 Orbiting scroll member 27C Boss part 29 Compression chamber 59 Groove for lubrication (groove)
61 Floating bush

Claims (4)

A compression mechanism comprising a pair of fixed scroll members and a revolving scroll member disposed in a housing and meshed with each other to form a compression chamber;
A crank pin that is rotatably supported in the housing and is provided at the shaft end of the housing is coupled to a boss portion on the rear surface of the end plate of the orbiting scroll member via a drive bush and an orbiting bearing. A crankshaft for revolving and driving,
The drive bush is integrally provided with a balance weight having a rising portion formed in an arc shape on the outer periphery,
In the scroll compressor, the refrigerant gas including the mist-like lubricating oil sucked into the housing is guided around the orbiting drive portion of the orbiting scroll member by being guided into the boss portion through the bearing gap of the orbiting bearing. ,
On the outer peripheral surface of the drive bush, a groove for oil supply that guides refrigerant gas containing mist-like lubricating oil is provided in the boss portion along the axial direction thereof,
Groove is a surface of a rotating direction side than the range for receiving the bearing load of the outer peripheral surface of the drive bush and the inner peripheral surface facing the rising portion formed in an arc shape on the outer peripheral portion of the balance weight A scroll compressor characterized by being provided at a position. The scroll compressor according to claim 1, wherein the slewing bearing is a needle bearing, and a floating bush is interposed between the needle bearing and an outer peripheral surface of the drive bush. The scroll compressor according to claim 2 , wherein the groove is provided so as to extend in an axial direction from an end surface of the floating bush. The groove scroll compressor according to any one of claims 1 to 3, characterized in that provided by simultaneous molding when the material forming the drive bush.

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