Patent Publication Number: US-11041387-B2

Title: Scroll fluid machine having injection holes through which lubricant is injected to the orbiting bearing

Description:
TECHNICAL FIELD 
     The present invention relates to a scroll fluid machine. 
     BACKGROUND ART 
     There is disclosed patent literature 1 as a related art of this technical field. 
     Patent literature 1 discloses a scroll fluid machine in which an oil supply hole is disposed on a front side of an eccentric shaft integrated with a drive shaft and is provided in an orbiting scroll to pass through in an axial direction of the orbiting scroll. The scroll fluid machine supplies grease toward a bearing of the eccentric shaft from an opening end on a front side of the oil supply hole (that is, on a side near a turning wrap). On a front side of a rotation preventing machine, the oil supply hole is provided in the orbiting scroll to pass through in the axial direction of the orbiting scroll. The grease is supplied toward the bearing of the rotation preventing machine from the opening end on the front side of the oil supply hole (that is, on a side near the turning wrap). 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: JP-A-2005-282496 
     SUMMARY OF INVENTION 
     Technical Problem 
     The scroll fluid machine disclosed in patent literature 1 is configured such that an orbiting bearing and a housing of the rotation preventing machine each are provided with only one oil supply hole for example, and the oil only can be supplied from one direction. Therefore, there is necessarily required a work space on the front side of the scroll fluid machine to replenish the grease. Further, in a case where there is an obstacle, the scroll fluid machine is necessarily moved, and thus the number of man-hours is significantly increased. 
     The invention has been made in view of the problems, and an object thereof is to provide a scroll fluid machine which can simply supply the grease to the bearing regardless of installation environments during maintenance, and workability is improved. 
     Solution To Problem 
     In order to solve the problem described above, according to the present invention, there is provided a scroll fluid machine, including: a stationary scroll which is provided with a wrap in an end plate; an orbiting scroll which is provided with a wrap facing the wrap of the stationary scroll in an end plate; a drive shaft which drives the orbiting scroll; an orbiting bearing which supports the drive shaft with respect to the orbiting scroll; and a plurality of injection holes through which a lubricant is injected to the orbiting bearing from an outer portion. 
     In addition, according to another aspect of the invention, there is provided a scroll fluid machine which includes a stationary scroll, an orbiting scroll which is provided to face the stationary scroll, a casing which is provided on an outer side in a radial direction of the orbiting scroll, a drive shaft which drives the orbiting scroll, and a plurality of rotation preventing machines which prevent the orbiting scroll from rotating. A bearing housing storing the plurality of rotation preventing machines is provided on a side near the casing and the orbiting scroll. At least one of the plurality of rotation preventing machines is provided with a plurality of injection holes on a side near the casing and on a side near the orbiting scroll to inject a lubricant from the outer portion to the bearing housing. 
     Advantageous Effects Of Invention 
     According to the invention, it is possible to provide a scroll fluid machine which is made to improve workability during maintenance. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  shows a cross-sectional view of a scroll compressor according to a first embodiment of the invention. 
         FIG. 2  shows a front view of a boss plate portion according to the first embodiment of the invention. 
         FIG. 3  shows a cross-sectional view of the boss plate portion according to the first embodiment of the invention. 
         FIG. 4  shows a cross-sectional view of the boss plate portion according to the first embodiment of the invention. 
         FIG. 5  shows a perspective view of a compressor body according to the first embodiment of the invention. 
         FIG. 6  shows a perspective view of the boss plate portion according to a second embodiment of the invention. 
         FIG. 7  shows a rear view of the boss plate portion according to the second embodiment of the invention. 
         FIG. 8  shows a cross-sectional view of the boss plate portion according to a third embodiment of the invention. 
         FIG. 9  shows a perspective view of the boss plate portion according to the third embodiment of the invention. 
         FIG. 10  shows a perspective view of the boss plate portion according to a fourth embodiment of the invention. 
         FIG. 11  shows a perspective view of the boss plate portion according to the fourth embodiment of the invention. 
         FIG. 12  shows a perspective view of the boss plate portion according to the fourth embodiment of the invention. 
         FIG. 13  shows a side view of the boss plate portion according to the fourth embodiment of the invention. 
         FIG. 14  shows a perspective view of the compressor body according to the fourth embodiment of the invention. 
         FIG. 15  shows a top view of a casing according to a fifth embodiment of the invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     First Embodiment 
     As an example of a scroll fluid machine according to the invention, a scroll compressor according to a first embodiment will be described with reference to  FIGS. 1 to 5 . 
     The entire configuration of the scroll fluid machine according to this embodiment will be described using  FIG. 1 . A compressor body  1  employs a scroll air compressor, and includes a casing  2 , a stationary scroll  3 , an orbiting scroll  4 , a drive shaft  9 , a crank  10 , and a rotation preventing machine  13  which will be described below. 
     The casing  2  forming an outer shell of the compressor body  1  is formed as a bottomed cylindrical body of which one side in an axial direction is closed and the other side in the axial direction is opened as illustrated in  FIG. 1 . In other words, the casing  2  is mainly configured by a cylindrical portion  2 A of which the other side (near the stationary scroll  3  described below) in the axial direction is opened, an annular bottom  2 B which is integrally formed in one side in the axial direction of the cylindrical portion  2 A and extends inward in a radial direction, and a cylindrical bearing mounting portion  2 C which protrudes toward both sides in the axial direction from an inner circumference side of the bottom  2 B. 
     In addition, the orbiting scroll  4 , the crank  10 , and the rotation preventing machine  13  described below are stored in the cylindrical portion  2 A of the casing  2 . In addition, on a side near the bottom  2 B of the casing  2 , a plurality of the rotation preventing machines  13  (only one is illustrated in  FIG. 1 ) are provided in a gap with an end plate  4 A of the orbiting scroll  4  to be disposed later at a predetermined interval therebetween in a circumferential direction. 
     The stationary scroll  3  is a scroll member which is provided to be fixed to the end side of the opening of the casing  2  (the cylindrical portion  2 A). Then, as illustrated in  FIG. 1 , the stationary scroll  3  is mainly configured by an end plate  3 A which is formed in a disk shape, a spiral wrap  3 B which is erected in the surface of the end plate  3 A, and a cylindrical support portion  3 C which is provided on an outer circumferential side of the end plate  3 A to surround the wrap  3 B from the outer side in the radial direction and fixed to the end side of the opening of the casing  2  (the cylindrical portion  2 A) using a plurality of bolts (not illustrated). 
     The orbiting scroll  4  of the other scroll member is provided facing the stationary scroll  3  in the axial direction so as to be turned in the casing  2 . Then, as illustrated in  FIG. 1 , the orbiting scroll  4  is mainly configured by the end plate  4 A of a disk shape, a wrap  4 B which is erected in the surface of the end plate  4 A, a plurality of cooling fins  4 C which are erected on the opposite side to the wrap  4 B, and a boss plate portion  5  which protrudes to a rear surface (a surface on the opposite side to the wrap  4 B) of the end plate  4 A and is mounted in the crank  10  described later through an orbiting bearing  12 . 
     In addition, on the outer side in the radial direction of the boss plate portion  5 , the rotation preventing machines  13  described later are disposed with a predetermined interval therebetween in the circumferential direction of the orbiting scroll  4  in a gap with the bottom  2 B of the casing  2 . Then, the boss plate portion  5  of the orbiting scroll  4  is disposed such that the center thereof is decentered in the radial direction by a predetermined dimension (turning radius) with respect to the center of the stationary scroll  3 . 
     A plurality of compressors  6  are defined between the wrap  3 B of the stationary scroll  3  and the wrap  4 B of the orbiting scroll  4 . Each compressor  6  is formed such that the wrap  3 B of the stationary scroll  3  is disposed to be overlapped with the wrap  4 B of the orbiting scroll  4  as illustrated in  FIG. 1  and each compressor  6  is interposed by the end plates  3 A and  4 A between these wraps  3 B and  4 B. 
     An intake port  7  is provided on an outer circumferential side of the stationary scroll  3 . The intake port  7  absorbs the air from the outer portion through an air filter  7 A for example. The air is continuously compressed along the turning operation of the orbiting scroll  4  in each compressor  6 . 
     A discharge port  8  is provided in the center of the stationary scroll  3 . The discharge port  8  is used to discharge the compressed air from the compressor  6  on the innermost side in the radial direction among the plurality of compressors  6  toward a storage tank described later (not illustrated). In other words, the orbiting scroll  4  is driven by an electric motor (not illustrated) or the like through the drive shaft  9  and the crank  10 . The orbiting scroll turns about the stationary scroll  3  in a state of being restricted in rotation by the rotation preventing machine  13  described later. 
     With this configuration, the compressor  6  on the outer side in the radial direction among the plurality of compressors  6  absorbs the air from the intake port  7  of the stationary scroll  3 . The air is continuously compressed in each of the compressors  6 . Then, the compressor  6  on the inner side in the radial direction is used to discharge the compressed air from the discharge port  8  located at the center of the end plate  3 A to the outer portion. 
     The drive shaft  9  is provided to be turned through a load side bearing  20  disposed in the bearing mounting portion  2 C of the casing  2  near the compressor body  1  and an anti-load side bearing  21  disposed away from the compressor body  1 . The drive shaft  9  is disposed such that the base end side (a side in the axial direction) thereof protruding to the outer portion of the casing  2  is detachably connected to a drive source of the electric motor (not illustrated) or the like, and is provided to be rotatably driven by the electric motor. In addition, a bearing housing  5 A in the boss plate portion  5  of the orbiting scroll  4  is connected to the tip end side (the other side in the axial direction) of the drive shaft  9  to be turned through the crank  10  and the orbiting bearing  12 , described later. 
     The crank  10  decentered to the center of the drive shaft  9  is integrally provided on the tip end side of the drive shaft  9 . The crank  10  is connected to the bearing housing  5 A of the boss plate portion  5  of the orbiting scroll  4  through the orbiting bearing  12  described later. Then, the crank  10  is rotated integrally to the drive shaft  9 . The rotation at that time is converted to a turning operation of the orbiting scroll  4  through the orbiting bearing  12 . 
     The plurality of rotation preventing machines  13  is provided between the bottom  2 B of the casing  2  and a rear surface side of the orbiting scroll  4  (only one is illustrated in  FIG. 1 ). For example, the rotation preventing machines  13  is configured by an auxiliary crank shaft  13 A, and auxiliary crank bearings  13 B and  13 C which are respectively disposed on sides near the casing  2  and the orbiting scroll  4 . Then, the auxiliary crank bearings  13 B and  13 C are stored in bearing housings  2 D and  5 B which are provided in the casing  2  and the boss plate portion  5  of the orbiting scroll  4  respectively. 
     Then, the rotation preventing machine  13  is used to prevent the rotation of the orbiting scroll  4  and to receive a thrust load from the orbiting scroll  4  by the bottom  2 B of the casing  2 . Further, for example, a ball coupling mechanism or an Oldham&#39;s shaft coupling mechanism may be used as the rotation preventing machine  13  instead of an auxiliary crank mechanism. 
     A discharge pipe  14  is provided to be connected to the discharge port  8  of the stationary scroll  3 . The discharge pipe  14  forms a discharge fluid path which communicates between the storage tank (not illustrated) and the discharge port  8 . 
     In the drive shaft  9 , a balance weight  11  is provided to stabilize the turning operation of the orbiting scroll  4 . In a case where the compressor is operated, the balance weight  11  rotates integrally to the drive shaft  9 . 
     The orbiting bearing  12  is disposed between the bearing housing  5 A of the boss plate portion  5  of the orbiting scroll  4  and the crank  10 . The orbiting bearing  12  supports the crank  10  with respect to the bearing housing  5 A of the boss plate portion  5  of the orbiting scroll  4 . The orbiting bearing  12  is used to compensate the turning operation of the orbiting scroll  4  in a predetermined radius with respect to an axial line of the drive shaft  9 . 
       FIG. 2  illustrates the boss plate portion  5  according to this embodiment.  FIGS. 3 and 4  illustrate cross-sectional views taken along lines A-A and B-B of the bearing housings  5 A and  5 B of the boss plate portion  5 . 
     The orbiting bearing  12  is surrounded by the bearing housing  5 A of the boss plate portion  5 , a seal member  15 , and the crank  10  of the drive shaft  9 . The seal member  15  is provided between the bearing housing  5 A of the boss plate portion  5  to seal a lubricant of the orbiting bearing  12  and the crank  10  of the drive shaft  9 . 
     The auxiliary crank bearing  13 C is surrounded by the bearing housing  5 B of the boss plate portion  5 , a pressing plate  13 D, a seal member  13 F, and the auxiliary crank shaft  13 A. The auxiliary crank bearing  13 C is inserted to the bearing housing  5 B of the boss plate portion  5 , and is strongly fastened by a flathead bolt  13 E (illustrated in  FIG. 1 ) together with the pressing plate  13 D. The depth of the bearing housing  5 B is set to be smaller than the height of the auxiliary crank bearing  13 B. The pressing plate  13 D is fastened by the flathead bolt  13 E so as to pre-load an outer wheel  13 G of the auxiliary crank bearing  13 C. The seal member  13 F is provided between the pressing plate  13 D and the auxiliary crank shaft  13 A in order to seal the lubricant of the auxiliary crank bearing  13 C. 
     In this embodiment, as pipes to supply the lubricant from the outside to the orbiting bearing  12  and the rotation preventing machine  13  through the bearing housing  5 A and the bearing housing  5 B in the boss plate portion  5  and through the side surface of the bearing housing  2 D of the casing  2 , a lubricant feeding passage  17  and a grease nipple  16  communicating to the outer portion are provided in each of the bearing housings  5 A,  5 B, and  2 D to face different directions. In this embodiment, the grease nipple  16  is structured to face the right and left directions when a scroll compressor is viewed from the stationary scroll. 
     The grease nipple  16  is an injection hole which includes a connection portion to connect a lubricant feeding tool such as a grease gun. The grease nipple  16  is structured to pass the lubricant from the outer portion toward the inside of the bearing housing  5 A and the bearing housing  5 B. The grease nipple has a function of inhibiting a reverse flowing of the lubricant from the inside of the bearing housing  5 A and the bearing housing  5 B to the outside. In addition, the grease nipple  16  may be structured to be variable in direction as needed. With such a configuration, the direction of the tip end of the grease nipple can be freely changed regardless of the direction of the lubricant feeding passage  17 , and workability is improved. In addition, the grease nipple  16  is provided detachably, and can be replaced as needed. 
     The lubricant can be replenished from different directions to the orbiting bearing  12  and the auxiliary crank bearing  13 C by providing two grease nipples  16 . With this configuration, the workability during maintenance can be improved.  FIG. 5  illustrates a perspective view during maintenance. For example, in a case where there is an obstacle on the left side of the scroll compressor, the grease may be replenished only from the right side. In a case where there is an obstacle on the right side, the grease may be simply replenished only from the left side without any remaking. In addition, a third grease nipple (not illustrated) may be provided in an upper direction as well as the right and left direction. In this case, even in a case where there are obstacles on the right and left sides, and thus the grease is hard to be replenished, the replenishment can be made from the upper direction, so that it is improved in convenience. Therefore, the number of grease nipples  16  is not limited to “2”, but may be “3” or more. In addition, usually, not the grease nipple  16 , but a lock screw with a hexagon hole or a rubber plug may be mounted to the lubricant feeding passage  17 . In that case, the grease may be replenished after removing the lock screw or the plug. 
     An opening is provided in the stationary scroll  3  or the casing  2 , or between the stationary scroll  3  and the casing  2 . Then, the tip end of the grease nipple  16  faces a direction to the opening which is provided in the stationary scroll  3  or the casing  2 , or between the stationary scroll  3  and the casing  2 . With such a configuration, the lubricant can be replenished through the grease nipple  16  by inserting a tool such as a nozzle from the opening without removing the stationary scroll  3 . With this configuration, the workability during maintenance can be improved. In addition, in a case where a plurality of openings are provided in the stationary scroll  3  or the casing  2 , or between the stationary scroll  3  and the casing  2 , a plurality of grease nipples  16  may be provided to face different openings. With this configuration, even in a case where there is an obstacle in a direction facing one opening, the lubricant can be supplied from the other opening in a direction where no obstacle exists. 
     A straight line connecting the opening provided in the stationary scroll  3  or the casing  2 , or between the stationary scroll  3  and the casing  2  with the tip end of the grease nipple  16  provided in the housing  5 A for the orbiting bearing  12  passes between two rotation preventing machines  13 . With the grease nipple  16  disposed in such a direction, the lubricant can be supplied from the opening to the grease nipple  16  without blocking the rotation preventing machine  13  when viewed from the opening. 
     As described above, according to this embodiment, as a pipe to supply the lubricant to the orbiting bearing  12  and the rotation preventing machine  13 , the plurality of the lubricant feeding passages  17  and the grease nipples  16  are provided in the boss plate portion  5 , and the tip ends of the grease nipples  16  are set to face different directions. Therefore, the lubricant can be easily replenished from a plurality of directions during maintenance. Therefore, the grease can be simply replenished from a direction where no obstacle exists without need of separate design and regardless of installation environments of the scroll compressor. In other words, according to this embodiment, it is possible to improve reliability and workability. 
     In addition, in this embodiment, the description has been given about an example in which the plurality of lubricant feeding passages  17  and grease nipples  16  are provided as a pipe to supply the lubricant to the orbiting bearing  12  and the rotation preventing machine  13 . However, the invention is not limited to the above configuration, and a plurality of injection holes to supply the lubricant to the load side bearing  20  or the anti-load side bearing  21  supporting the drive shaft  9  may be provided with respect to one bearing housing. 
     Second Embodiment 
     A scroll compressor according to a second embodiment of the invention will be described using  FIG. 6 . The same configurations as those of the first embodiment will be assigned with the same symbols, and the descriptions thereof will be omitted. This embodiment has a feature in that there are provided a plurality of grease nipples  16  facing the same direction to supply the lubricant. 
       FIG. 6  illustrates the boss plate portion  5  in this embodiment. In this embodiment, two grease nipples  16  facing the same direction are disposed in the bearing housing  5 A for the orbiting bearing  12 . In a case where an lubricant is replenished by the grease nipple  16 , grease is attached to the tip end of the grease nipple  16 , and impurities such as dust may be easily attached to the grease nipple  16 . In this case, when the lubricant is replenished in the second time, the impurities at the tip end of the grease nipple  16  are mixed with the lubricant and enter the bearing housing  5 A, and cause a damage on the orbiting bearing  12 . To solve this problem, this embodiment is configured by two grease nipples facing the same direction. Therefore, the grease nipples  16  to be used in the first and second replenishments of the lubricant can be divided, so that it is possible to improve reliability of the orbiting bearing  12  while preventing the impurities from being mixed. 
     In addition, the grease nipple  16  in the first embodiment has been described to have the function of inhibiting a reverse flowing of the lubricant. In this embodiment, the injection holes having no the function of inhibiting a reverse flowing of the lubricant may be used instead of the plurality of grease nipples  16 . One of the injection holes facing the same direction may be used to supply the lubricant, and the other may be used to discharge the lubricant. With this configuration, it is possible to remove the mixed impurities while supplying the lubricant. 
     In addition, the plurality of grease nipples  16  may be further disposed to face different directions similarly to the first embodiment, so that the lubricant can be replenished regardless of installation environments. Further, it is possible to improve workability and reliability while preventing the impurities from being mixed even in the second time of replenishment. In addition, this embodiment has been described using the structure in which the grease nipples  16  are mounted to face the same direction as that of the bearing housing  5 A as an example. The plurality of grease nipples may be provided to face the same direction similarly even in the bearing housings  5 B and  2 D for the rotation preventing machine  13 . In that case, it is possible to improve workability and reliability of the auxiliary crank bearings  13 C and  13 B. 
     Further, in a case where the opening is provided in the stationary scroll  3  or the casing  2 , or between the stationary scroll  3  and the casing  2 , the effects of this embodiment may be achieved if the grease nipples face the same opening even though the grease nipples do not face the same direction. 
     In this embodiment, the description has been given about an example in which two grease nipples facing the same direction are provided. However, the number of grease nipples is not limited to “2”, but may be “3” or more. 
     Third Embodiment 
     A scroll compressor according to a third embodiment of the invention will be described using  FIGS. 7 to 9 . The same configurations as those of the first embodiment will be assigned with the same symbols, and the descriptions thereof will be omitted. This embodiment has a feature in that a projection  18  is provided in the bearing housing  5 B.  FIG. 7  illustrates a rear view of the boss plate portion  5  in this embodiment. In this embodiment, the projection  18  protruding toward the end plate  4 A of the orbiting scroll  4  is provided in an end plate surface  5 C on a side near the end plate  4 A of the orbiting scroll  4  of the boss plate portion  5 . The plurality of grease nipples  16  are disposed in the projection  18 .  FIG. 8  illustrates a cross-sectional view taken along line C-C of the bearing housing  5 B of the auxiliary crank in this embodiment. With the projection  18  protruding toward the end plate  4 A of the orbiting scroll  4 , the lubricant can be replenished even from the opposite side to the rotation axis of the drive shaft  9  of the scroll compressor. For example, the lubricant can be easily replenished to the bearing housing  5 B on the right side in  FIG. 7  even from the left side in the drawing. In addition, with the projection  18 , a flowing direction of the lubricant becomes the same direction as that of a gap of the auxiliary crank bearing  13 C. Further, the lubricant can sufficiently flow in the bearing. Therefore, the reliability is improved. In addition,  FIG. 9  illustrates a perspective view of the bearing housing  5 B. With the configuration of the projection  18 , a grease reservoir  18 A can be formed to store the lubricant in the projection  18 . By forming the grease reservoir  18 A, the amount of lubricant to be stored in the bearing housing is increased, and a period up to next maintenance can extend. In this embodiment, the description has been given about a case where the projection  18  is provided at a position corresponding to the bearing housing  5 B of the auxiliary crank bearing  13 B of the end plate surface  5 C of the boss plate portion  5 . However, the same effect may be achieved even in a case where the projection protruding toward the end plate  4 A of the orbiting scroll  4  is provided at a position corresponding to the bearing housing  5 A of the orbiting bearing  12  of the end plate surface  5 C of the boss plate portion  5 . 
     Fourth Embodiment 
     A scroll compressor according to a fourth embodiment of the invention will be described using  FIGS. 10 to 14 . The same configurations as those of the first embodiment will be assigned with the same symbols, and the descriptions thereof will be omitted. This embodiment has a feature in that there is provided with a guide for supplying the lubricant.  FIG. 10  illustrates a perspective view of the orbiting scroll  4  and the boss plate portion  5 . In this embodiment, the projection  18  is provided in the rear surface (on a side near the orbiting scroll  4 ) of the bearing housing  5 A. Two grease nipples  16  are disposed in the projection  18 . In addition, a guide  19  along a nozzle for supplying the grease is formed in the cooling fin  4 C which is in the rear surface of the end plate  4 A of the orbiting scroll  4 . With this configuration, the lubricant can be easily replenished even in a case where the grease nipple  16  disposed in the rear surface of the bearing housing  5 A of the boss plate portion  5  is not possible to be viewed. Further, it is possible to improve workability during maintenance. 
       FIGS. 11 to 14  illustrate modifications of this embodiment. In the modification illustrated in  FIG. 11 , a guide  19 A is formed by making a part of the cooling fin  4 C low. In addition, in the modification illustrated in  FIG. 12 , a guide  19 B is similarly formed by making a part of the end plate surface  5 C of the boss plate portion  5  dented. With such a configuration, the guide can be easily formed. In addition, in the modification illustrated in  FIG. 13 , a guide  19 C is formed by making an interval of the cooling fins  4 C matched with the diameter of a nozzle of the grease gun  22 . In addition, in the modification illustrated in  FIG. 14 , a guide  19 D is formed similarly by making a part of the casing  2  dented. 
     Hitherto, according to this embodiment, the workability during maintenance can be further improved compared to the first embodiment since the guide  19  is formed along the nozzle for supplying the grease. 
     In addition, according to this embodiment, the reliability and the maintenance performance can be further improved compared to the first and second embodiments since the projection  18  is provided in the boss plate portion  5 . 
     Fifth Embodiment 
     A scroll compressor according to a fifth embodiment of the invention will be described using  FIG. 15 . The same configurations as those of the first embodiment will be assigned with the same symbols, and the descriptions thereof will be omitted. 
       FIG. 15  illustrates a top view of the casing  2  according to this embodiment. This embodiment has a feature in that a plurality of replenishment passages are provided as openings in the side surface of the casing  2  to replenish the lubricant to the bearing housing  5 B (not illustrated). A plurality of replenishment passages  23  serving as channels of the nozzles of the grease gun  22  are disposed in the side surface of the casing  2  with different nozzle-inserting directions in accordance with positions of the grease nipples  16  disposed in the bearing housing  5 B (not illustrated). With this configuration, the lubricant can be easily replenished to the grease nipple  16  disposed in the bearing housing  5 B. In addition, outside the maintenance hours, the replenishment passage  23  may be mounted with a rubber lid which is easily removed. With the rubber lid, it is possible to prevent that a cool air is leaked out of the replenishment passage  23  during the operation of the compressor. Further, since the rubber lid is easily removed, the workability during maintenance is not degraded. 
     In this embodiment, the replenishment passage  23  is provided in the side surface of the casing  2 . However, the installation is not limited to the casing  2 , and the replenishment passage may be provided in the stationary scroll  3 . In addition, the replenishment passage may be provided between the casing  2  and the stationary scroll  3 . 
     The embodiments described above have been described as merely exemplary to implement the invention. A technical scope of the invention should not be interpreted in a limited way by these embodiments. In other words, the invention may be implemented in various ways without departing from technical ideas or principal features. In addition, the invention may be implemented by combining a plurality of embodiments. 
     Further, the description has been given about the scroll fluid machine, but the invention is not limited to the scroll fluid machine. The invention may be applied to other fluid machines such as a reciprocating compressor and a screw compressor as long as a fluid machine body is driven by compressing or expanding a fluid by the drive shaft, and a bearing supporting the drive shaft or a bearing supporting a driven shaft driven along with the rotation of the drive shaft is provided. 
     REFERENCE SIGNS LIST 
     
         
           1  compressor body 
           2  casing 
           2 A cylindrical portion 
           2 B bottom 
           2 C bearing mounting portion 
           2 D bearing housing 
           3  stationary scroll (scroll member) 
           3 A end plate 
           3 B wrap 
           3 C support portion 
           4  orbiting scroll (scroll member) 
           4 A end plate 
           4 B wrap 
           4 C cooling fin 
           5  boss plate portion 
           5 A bearing housing (orbiting bearing) 
           5 B bearing housing (auxiliary crank bearing) 
           5 C end plate surface 
           6  compressor 
           7  intake port 
           7 A air filter 
           8  discharge port 
           9  drive shaft 
           10  crank 
           11  balance weight 
           12  orbiting bearing 
           13  rotation preventing machine 
           13 A auxiliary crank shaft 
           13 B auxiliary crank bearing 
           13 C auxiliary crank bearing 
           13 D pressing plate 
           13 E flathead bolt 
           13 F seal member (auxiliary crank bearing) 
           13 G outer wheel 
           14  discharge pipe (discharge fluid path) 
           15  seal member (orbiting bearing) 
           16  grease nipple 
           17  lubricant feeding passage 
           18  projection 
           18 A grease reservoir 
           19  guide 
           19 A cooling fin guide 
           19 B boss plate guide 
           19 C cooling fin gap guide 
           19 D casing guide 
           20  load side bearing 
           21  anti-load side bearing 
           22  nozzle of grease gun 
           23  replenishment passage