JP2013124620A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor which responds to request to reduce size and weight of the compressor, prevents restriction of layout when mounted to a vehicle, and obviates the need to structure an oil storage chamber by considering a positional relationship with a mounting part to the vehicle even when the mounting part to the vehicle is arranged on the outer surface of a bottom wall of a rear housing of the compressor.SOLUTION: A rear housing 4 constituting a housing 7 of this compressor by being mounted to a front housing and a cylinder block is located on the side opposite to a pulley side with respect to the cylinder block, and includes: an intake chamber 33 and a discharge chamber 34; an oil separation mechanism 44 for separating lubricating oil mixed in a heat exchange medium discharged to the discharge chamber 34; and an oil storage chamber 53 for storing the lubricating oil separated from the heat exchange medium by the oil separation mechanism 44; wherein the oil storage chamber 53 includes an opening opened to the pulley side of the rear housing 4, and the opening is closed by a cover member 55.

Description

  The present invention relates to a compressor having an oil separation mechanism capable of separating lubricating oil mixed in a heat exchange medium such as a compressed refrigerant, and more particularly to a compressor constituting a vehicle air conditioner.

  In this type of vehicle refrigeration cycle, for example, as shown in Patent Document 1 and the like, a compressor, a condenser, an expansion valve, and an evaporator are appropriately connected by piping. It is already known that a refrigerant is filled as a heat exchange medium for exchanging heat with an air flow in the cooler, and that the refrigerant is circulated in the refrigeration cycle by the compression action of the compressor.

  In order to lubricate the sliding parts of the compressor, it is necessary to supply lubricating oil to the sliding parts and seal with the lubricating oil. This lubricating oil is mixed with the flow of the refrigerant gas. It is already known that the refrigerant flows out of the compressor into the refrigeration cycle (for example, Patent Document 2).

  In this case, since the amount of lubricating oil flowing out from the compressor into the refrigeration cycle is relatively large, not only does the compressor run out of oil, but also the efficiency of heat exchange with the air flow in the evaporator is reduced. Therefore, it is necessary to provide an oil separation structure in the compressor. As a structure for separating the lubricating oil from the refrigerant in the oil separation structure, a centrifugal oil separation structure provided in the high pressure region is used. Is generally used as disclosed in, for example, Patent Document 3.

  In this type of centrifugal oil separation structure provided in the high pressure region, the lubricating oil separated from the refrigerant is temporarily stored in the oil storage chamber in the high pressure region, and then the pressure in the high pressure region and the low pressure region. Due to the difference from the pressure, it is discharged to the suction chamber, which is a low pressure region, through the orifice, compressed and discharged by the compression mechanism together with the refrigerant as the heat exchange medium, and then separated by the oil separation mechanism and circulated in the compressor. It has become.

  When such an oil separation structure is used, there is a concern that all the lubricating oil in the oil storage chamber is sent to the suction chamber and is exhausted due to the pressure difference between the pressure in the high pressure region and the pressure in the low pressure region. When the lubricating oil is exhausted, the sealing function by the lubricating oil at the orifice portion is impaired, and the refrigerant blows out directly from the high pressure region to the low pressure region, which may significantly reduce the performance of the compressor.

  In order to prevent such an event, the orifice throttling is optimized so that oil is constantly present in the oil reservoir, but conversely, lubricating oil continues to accumulate in the oil reservoir and the oil reservoir is When the lubricating oil is full, part of the lubricating oil flows out of the compressor, causing a problem that the heat exchange efficiency of the heat exchanger (evaporator) deteriorates.

  In this respect, in the compressor disclosed in Patent Document 3, the rear side of the compressor housing (the opposite side to the pulley side of the compressor) from the suction passage and the suction port of the housing in the direction along the axial direction of the drive shaft. The oil separation cylinder and the oil storage chamber are provided at the position where That is, the oil separation cylinder includes a first plate that closes the sub chamber opened to the rear side of the rear housing, a separation pipe that is attached to the first plate and has one end communicating with the sub chamber, and the other of the separation pipes The separation space has an end projecting from the first plate. The separation space is attached to the second plate so as to close the opening of the separation space and the second plate that opens to the rear side. The first plate, the second plate, and the cover member are stacked in the axial direction of the drive shaft. The oil reservoir is positioned in the width direction of the compressor with respect to the oil separation cylinder, and is configured by the rear side end face of the rear housing, the first plate, and the second plate.

Japanese Patent Laid-Open No. 7-218007 JP 2009-108750 A JP 2011-144688 A

  In the case where the oil storage chamber is formed so as to bulge to the rear side in the direction along the axial direction of the drive shaft of the compressor housing, as shown in Patent Document 3, the drive shaft is formed on the rear side of the housing. Therefore, when the compressor is mounted on a vehicle, it is necessary to consider the interference between the outer portion and the engine or its peripheral devices. Since the size and amount of the air conditioner are increased, the vehicle air-conditioning apparatus is not required to be lighter and smaller, and thus the compressor constituting the vehicle air-conditioning apparatus is not required to be lighter and smaller. Further, there is a disadvantage that fastening parts such as bolts for attaching the cover member from the outside are required.

  Further, in the compressor provided with an attachment portion for attaching the compressor to the vehicle body on the rear side of the rear housing, as shown in Patent Document 3, the opening of the oil storage chamber is opened on the rear side of the compressor, When adopting a configuration in which the opening of the oil storage chamber is closed with a cover member, the cover member cannot be disposed at a location that interferes with the attachment portion. For this reason, when the mounting portion of the compressor is provided in the center of the rear housing, for example, it becomes necessary to arrange the oil storage chamber at a position avoiding interference with the mounting portion, and securing a sufficient volume of the oil storage chamber. As a result, there is a disadvantage that the rapid discharge of the separated oil into the oil storage chamber is hindered.

  Therefore, the present invention responds to a request for downsizing and weight reduction of a compressor even if it has an oil storage chamber for storing lubricating oil separated from a refrigerant as a heat exchange medium by an oil separation mechanism. An object of the present invention is to provide a compressor whose layout is not restricted when installed. Furthermore, even when a mounting portion for mounting on a vehicle is provided on the rear side outer surface of the compressor housing, a compressor that eliminates the need to configure an oil storage chamber in consideration of the positional relationship with the mounting portion is provided. The purpose is to do.

A compressor according to the present invention includes a housing composed of a plurality of housing members, a drive shaft rotatably supported by the housing and rotated by an external driving force via a pulley, and rotational movement of the drive shaft. A compressor having a compression mechanism for converting into a compression action of a heat exchange medium,
Of the plurality of housing members, a rear housing provided on the opposite side of the pulley is discharged with a suction chamber into which a heat exchange medium is sucked from outside the housing and a heat exchange medium compressed by the compression mechanism. A discharge chamber, an oil separation mechanism for separating the lubricating oil mixed in the heat exchange medium discharged into the discharge chamber from the heat exchange medium, and an oil for storing the lubricating oil separated from the heat exchange medium by the oil separation mechanism A storage chamber is provided, and the oil storage chamber has an opening portion opened to the pulley side of the rear housing, and the opening portion is closed from the pulley side by a cover member. (Claim 1). More specifically, the rear housing has a bottomed cylindrical shape, and the space of the oil storage chamber is formed by projecting an annular inner wall toward the pulley from the inner surface of the bottom wall of the rear housing. It is characterized (claim 2). An attachment portion for attaching the compressor to a predetermined structure of the vehicle is provided on the outer surface of the bottom wall of the rear housing, and the radial position of the attachment portion is at least via the bottom wall of the rear housing. A part of the oil storage chamber is disposed so as to overlap with the radial position of the oil storage chamber (claim 3). Furthermore, the lubricating oil separated from the heat exchange medium by the oil separation mechanism is discharged into the suction chamber (claim 4). Here, the housing member includes those that appear on the outer surface of the compressor, such as a front housing, a cylinder block, and a valve plate, in addition to the specified rear housing. The oil separation mechanism is, for example, a centrifugal oil separation mechanism. The oil storage chamber may be provided on the suction chamber side or on the discharge chamber side. The predetermined structure is, for example, a vehicle engine, more specifically, a compressor mounting portion provided in the engine. The attachment portion is composed of an attachment portion main body through which a fixing tool such as a bolt is inserted and an interference avoidance portion provided at a portion through which the fixing member of the rear housing passes.

  Thus, the cover member closes the opening of the oil storage chamber from the inside of the housing, so that the cover member can be fixed to the housing with a simple structure.

  In addition, the opening of the oil storage chamber is not opened on the outer surface of the housing of the compressor, and the opening of the oil storage chamber is closed with a cover member from the inside of the housing, so that the mounting portion for attaching the compressor to the vehicle Is provided at any position including the center of the rear side outer surface of the bottom wall of the rear housing of the compressor, it is possible to configure the oil reservoir without interfering with the mounting portion.

  Furthermore, the wall portion for forming the space for the oil separation mechanism and the oil reservoir chamber does not protrude relatively greatly along the axial direction of the drive shaft from the rear side outer surface of the bottom wall of the rear housing of the compressor. Even in the separation mechanism, the compressor can be provided so as to slightly protrude from the rear-side outer surface of the bottom wall of the rear housing, so that the compressor can be relatively reduced in size and weight.

  The compressor according to the present invention is characterized in that an orifice is formed in the cover member to communicate the oil reservoir chamber with a region outside the oil reservoir chamber (Claim 5). Here, the orifice is, for example, a fixed orifice.

  This eliminates the need for an orifice in the compressor rear housing itself. When the oil storage chamber is provided on the discharge chamber side, it is necessary to provide a communication hole in the rear housing that communicates with the suction chamber. However, by providing the oil storage chamber on the suction chamber side, the cover member communicates directly with the suction chamber. It is possible to provide an orifice.

  In the compressor according to the present invention, the suction chamber and the discharge chamber are formed such that the suction chamber is located on the center side of the rear housing, and the discharge chamber is annularly formed around the suction chamber. At the same time, the oil storage chamber is located below the oil separation mechanism (Claim 6). As a result, the lubricating oil separated by the oil separation mechanism flows naturally and smoothly to the oil reservoir chamber side.

  As described above, according to the first to sixth aspects of the invention, since the cover member closes the opening of the oil storage chamber from the inside of the housing, the cover member is fixed to the housing with a simple structure. Therefore, the manufacturing cost of the compressor can be reduced.

  In addition, since the oil storage chamber is not opened to the outer surface of the compressor, and the opening of the oil storage chamber is closed from the inside by a cover member, an attachment portion for attaching the compressor to the vehicle is provided on the bottom wall of the rear housing. The oil reservoir can be configured without interfering with the mounting part regardless of the position of the rear side outer surface of the bottom wall of the rear housing of the compressor, such as the center of the rear side outer surface. Therefore, the oil storage chamber can be configured at a desired location.

  Furthermore, the wall portion for forming the space for the oil separation mechanism and the oil reservoir chamber does not protrude relatively greatly along the axial direction of the drive shaft from the rear side outer surface of the bottom wall of the rear housing of the compressor. Even in the separation mechanism, the compressor can be provided so as to slightly protrude from the rear-side outer surface of the bottom wall of the rear housing, so that the compressor can be relatively reduced in size and weight.

  In particular, according to the fifth aspect of the present invention, by providing the orifice in the cover member which is a member different from the rear housing of the compressor, it is not necessary to provide the orifice in the rear housing. Manufacturing costs are reduced.

  In particular, according to the invention described in claim 6, it is possible to cause the oil separated by the oil separation mechanism to flow naturally and smoothly to the oil storage chamber without providing a complicated mechanism. It is possible to further simplify the structure of the compressor.

FIG. 1 is a cross-sectional view showing an example of the configuration of the compressor of the present invention. 2A is a configuration diagram showing the configuration of the rear housing of the compressor shown in FIG. 1, and FIG. 2B is a cross-sectional view taken along line AA of FIG. 2A. FIG. 3 is an enlarged view showing an oil separation mechanism and an oil storage chamber provided in the rear housing of the compressor. FIG. 4 is an explanatory diagram of the components constituting the oil separation mechanism shown in FIG. FIG. 5A is an explanatory view showing the rear side outer surface of the bottom wall of the rear housing of the compressor, and FIG. 5B is an attachment provided on the rear side outer surface of the bottom wall of the compressor rear housing. It is a perspective view for showing the composition of a part (attachment part main part and interference avoidance part). FIG. 6 is a further enlarged view of the peripheral portion of the orifice of the cover member for forming the oil storage chamber space in the rear housing shown in FIG.

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

  FIG. 1 shows a compressor 1 suitable for a refrigeration cycle of a vehicle air conditioner using a heat exchange medium such as a refrigerant. The compressor 1 is, for example, a clutchless swash plate type variable displacement compressor, and a cylinder block 2 and a rear housing assembled to the rear side (right side in the figure) of the cylinder block 2 via a valve plate 3. 4 and a front housing 6 that is assembled so as to cover the front side (left side in the drawing) of the cylinder block 2 and that defines the crank chamber 5 on the front side of the cylinder block 2. Among these, the rear housing 4 has a bottomed cylindrical shape having a bottom wall 4c as shown in FIG. The front housing 6, cylinder block 2, valve plate 3 and rear housing 4 are fastened in the axial direction of the drive shaft 8 described below by fastening bolts (not shown) to form a housing 7.

  A crank chamber 5 provided by the front housing 6 and the cylinder block 2 accommodates a drive shaft 8 having one end protruding from the front housing 6. As shown in FIG. 1, the drive shaft 8 has a pulley 19 attached to the one end, and is connected to a traveling engine (not shown) via a belt (not shown) and the pulley 19, thereby Is transmitted to rotate. One end of the drive shaft 8 is hermetically sealed with the front housing 6 through a seal member 16 provided between the drive shaft 8 and the front housing through a bearing 9. 6 is rotatably supported. The other end side of the drive shaft 8 is rotatably supported by the cylinder block 2 via a bearing 10 housed in a cylindrical space portion 11 described below. Further, in this embodiment, a thrust ring 18 is disposed between the other end of the drive shaft 8 and the valve plate 3, and the thrust ring 18 restricts the movement of the drive shaft 8 toward the valve plate 3. ing.

  The cylinder block 2 is formed with a cylindrical space 11 in which the bearing 10 is accommodated, and a plurality of cylinder bores 12 arranged at equal intervals on a circumference centering on the cylindrical space 11. A hollow single-head piston 13 is inserted into each cylinder bore 12 so as to be capable of reciprocating in the axial direction of the drive shaft 8.

  A thrust flange 14 that rotates integrally with the drive shaft 8 is fixed to the drive shaft 8 in the crank chamber 5. The thrust flange 14 is rotatably supported on an inner wall surface formed substantially perpendicular to the drive shaft 8 of the front housing 6 via a thrust bearing 15. A swash plate 21 is connected to the thrust flange 14 via a link member 20.

  The swash plate 21 is held so as to be tiltable in the longitudinal direction of the compressor 1 (the axial direction of the drive shaft 8) within a predetermined range with respect to the drive shaft 8, and rotates integrally with the rotation of the thrust flange 14. It is supposed to be. An engaging portion 13 a of the single-headed piston 13 is moored at a peripheral portion of the swash plate 21 via a pair of shoes 23 provided in the longitudinal direction of the drive shaft 8.

  As a result, when the drive shaft 8 rotates, the swash plate 21 also rotates, and the rotational motion of this swash plate 21 is converted into the reciprocating linear motion of the single-head piston 13 via the shoe 23, and in the cylinder bore 12, the single-head piston 13 and the valve The volume of the compression chamber 25 formed between the plate 3 is changed.

  The valve plate 3 is formed with suction holes 31 and discharge holes 32 corresponding to the respective cylinder bores 12, and the rear housing 4 has a suction chamber 33 for storing refrigerant to be supplied to the compression chamber 25, and a compression chamber A discharge chamber 34 for accommodating the refrigerant discharged from 25 is provided. The suction chamber 33 and the discharge chamber 34 are partitioned by the inner wall 17. In this embodiment, the suction chamber 33 is formed in the central portion of the rear housing 4, and the discharge chamber 34 is annularly formed around the suction chamber 33. Is formed.

  The suction chamber 33 communicates with a suction port portion 35a (shown in FIG. 5B) of a suction port portion 35 connected to the low pressure side (evaporator outlet side) of the refrigeration cycle, and the discharge chamber 34 is a refrigeration chamber. After passing through the discharge port of the discharge port portion 36 connected to the high-pressure side of the cycle (the inlet side of the radiator) and the communication passages 4a, 3a, and 2a described later, they are further communicated with each other through the muffler chamber 39. The suction chamber 33 can communicate with the compression chamber 25 via a suction hole 31 opened and closed by a suction valve 37, and the discharge chamber 34 is compressed via a discharge hole 32 opened and closed by a discharge valve 38. Communication with the chamber 25 is possible.

  The discharge capacity of the compressor 1 is determined by the stroke of the piston 13, and this stroke is determined by the inclination angle of the swash plate 21 with respect to the plane orthogonal to the axial direction of the drive shaft 8. That is, the pressure applied to the surface of the piston 13 facing the compression chamber 25, that is, the pressure of the compression chamber 25 (pressure of the cylinder bore 12), and the pressure applied to the surface of the piston 13 facing the crank chamber, ie, the pressure of the crank chamber 5 ( The inclination of the swash plate 21 is determined when the differential pressure from the crank chamber pressure) and the urging force of the spring 26 urging the swash plate 21 in the direction of decreasing the piston stroke and the direction of increasing the piston stroke are balanced. Thus, the piston stroke is determined and the discharge capacity is determined.

  Further, the compressor 1 is provided with an air supply passage, an extraction passage, and a known pressure control means. The pressure control means is, for example, a pressure control valve, and is housed in a housing portion 64 provided in the rear housing 4 as shown in FIG. Although not shown, the air supply passage communicates the discharge chamber 34 and the crank chamber 5, and the pressure control means described above is disposed in the air supply passage. The bleed passage is for allowing the refrigerant flowing into the crank chamber 5 to escape to the suction chamber 33, and is provided in the communication passage 41 formed in the drive shaft 8 and the orifice 42 provided in the valve plate 3 and communicating with the communication passage 41. It is comprised by. For this reason, the amount of refrigerant supplied to the crank chamber 5 is adjusted by the pressure control means provided in the middle of the air supply passage to control the pressure of the crank chamber 5, and the piston stroke, that is, the discharge capacity is adjusted. It is like that.

  Accordingly, when the drive shaft 8 rotates, the swash plate 21 rotates with a predetermined inclination, so that the edge of the swash plate 21 swings in a predetermined range in the axial direction of the drive shaft 8. As a result, the piston 13 held at the edge of the swash plate 21 reciprocates with a predetermined stroke in the axial direction of the drive shaft 8 and is compressed from the suction chamber 33 via the suction hole 31 opened and closed by the suction valve 37. The refrigerant is sucked into the chamber 25, and the compressed refrigerant is discharged from the compression chamber 25 to the discharge chamber 34 through the discharge hole 32 opened and closed by the discharge valve 38 during the compression stroke.

  The crank chamber 5 stores lubricating oil for lubricating the sliding parts in the crank chamber 5. The lubricating oil is swept up by the oscillating rotation of the swash plate 21 to form a mist, which lubricates the sliding parts in the crank chamber 5, and a part of the mist-shaped lubricating oil is The lubricating oil discharged to the suction chamber 33 through the bleed passage along with the refrigerant in the refrigerant 5 and further discharged to the suction chamber 33 is sucked into the compression chamber 25 by the reciprocating motion of the piston 13 together with the refrigerant. Furthermore, a part of the lubricating oil sucked into the compression chamber 25 together with the refrigerant is returned to the crank chamber 5 through the clearance between the piston 13 and the cylinder bore 12, and the rest of the lubricating oil is discharged together with the refrigerant. It is discharged into the chamber 34. The lubricating oil discharged into the discharge chamber 34 together with the refrigerant is separated by an oil separation mechanism 44 described later and stored in an oil storage chamber 53 described later, while the lubricating oil not separated by the oil separation mechanism 44 is refrigerant. At the same time, it is discharged into the refrigeration cycle, and is taken into the compressor 1 through the refrigeration cycle.

  The oil separation mechanism 44 is of a centrifugal separation type in this embodiment, and has a cylindrical inner wall extending in the discharge chamber 34 substantially parallel to the axial direction of the drive shaft 8 as shown in FIGS. A chamber 46 formed by 45 is provided. The chamber 46 is opened to the valve plate 3 side, and an oil separation cylinder 47 is inserted into the chamber 46 from the opening of the chamber 46 and attached.

  The chamber 46 communicates with the discharge chamber 34 through the communication passage 43 as shown in FIG. 3, and is formed in the rear housing 4, the valve plate 3, and the cylinder block 2 as shown in FIG. It communicates with a muffler chamber 39 disposed in the peripheral portion of the cylinder block 2 through the communication passages 4a, 3a, and 2a. In this embodiment, the muffler chamber 39 is defined between the cylinder block 2 and the lid member 40 attached to the outer periphery thereof. A discharge port portion 36 is formed in the lid member 40.

  Further, as shown in FIG. 3, the chamber 46 includes a large-diameter chamber portion 46a separated from the discharge chamber 34 by a lid 48 of an oil separation cylinder 47 described later, and a flange of a main body 49 of the oil separation cylinder 47 described later. 49c has a small-diameter chamber portion 46b partitioned from the large-diameter chamber portion 46a, and communicates with the small-diameter chamber portion 46b on the most rear side of the compressor 1 and has a larger inner diameter than the small-diameter chamber portion 46b. It has a side room portion 46c. Here, the outer surface of the rear side of the rear housing 4 is provided with a drive shaft 8 for defining a rear side room portion 46c of the room 46, as shown in FIGS. 1, 2B, 3 and 5. It has the protrusion part 4b protruded in the axial direction. The chamber 46 communicates with the discharge chamber 34 through the communication passage 43 in the small-diameter chamber portion 46b, and sequentially communicates with the muffler chamber 39 through the communication passages 4a, 3a, and 2a in the large-diameter chamber portion 46a. The rear chamber portion 46c communicates with an oil storage chamber 53 described later via a communication passage 50.

  As shown in FIG. 4, the oil separation cylinder 47 includes a lid body 48 and a main body 49 which are separate members. The lid 48 has a disk shape having an outer periphery slightly larger than the inner periphery of the large-diameter chamber portion 46a, and as shown in FIG. 3, a portion in the vicinity of the boundary between the discharge chamber 34 and the large-diameter chamber portion 46a. It can be press-fitted into. As shown in FIG. 4, the main body 49 is configured integrally with a first cylindrical portion 49 a, a second cylindrical portion 49 b, and a flange 49 c. The first cylindrical portion 49a is disposed at a position substantially opposite to the opening of the communication passage 4a when the oil separation cylinder 47 is mounted in the chamber 46, and a plurality of first cylindrical portions 49a are provided on the side surface as shown in FIG. There are four through holes 52 (four in this embodiment at equal intervals). As shown in FIG. 3, the second cylindrical portion 49b has the same inner diameter as that of the first cylindrical portion 49a, and the outer diameter is smaller than the outer diameter of the first cylindrical portion 49a. Accordingly, the thickness is thinner than that of the first cylindrical portion 49a. As shown in FIG. 3, the flange 49c is larger than the inner diameter of the small-diameter chamber portion 46b and is the same as or slightly larger than the large-diameter chamber portion 46a.

  As a result, the oil separation cylinder 47 is mounted in the chamber 46 from the front side (valve plate 3 side) of the compressor 1 with respect to the rear housing 4, thereby defining the chamber 46 and the communication path 4 a. One end side opens into the room 46. Further, the longitudinal dimension of the second cylindrical portion 49b is such that the opening end of the second cylindrical portion 49b is the rear side chamber portion even when the oil separation cylinder 47 is mounted in the chamber 46, as shown in FIG. It does not reach the region of 46c.

  By configuring the oil separation mechanism 44 and the muffler chamber 39 as described above, the refrigerant flowing into the small-diameter chamber portion 46 b of the chamber 46 from the discharge chamber 34 via the communication path 43 is transferred to the second cylinder of the oil separation cylinder 47. After the oil is separated by centrifugal force around the outer periphery of the part 49b in a spiral shape, the oil reaches the rear side chamber part 46c, and from the opening end of the oil separation cylinder 47 into the second cylindrical part 49b, the first cylindrical part 49a. It moves inward, reaches the muffler chamber 39 through the communication holes 4a, 3a, and 2a sequentially from the through hole 52 of the first cylindrical portion 49a, and is further discharged from the discharge port portion 36 to the outside of the compressor 1. . The oil separated from the refrigerant by the oil separation mechanism 44 is sent by gravity to the oil storage chamber 53 described later through the communication passage 50 from the rear side chamber portion 46c.

  The refrigerant discharged from the compression chamber 25 includes at least the discharge chamber 34, the communication passage 43, the chamber 46 of the oil separation mechanism 44, the communication passages 4a, 3a, and 2a, the muffler chamber 39, and the discharge port portion 36 described above. A discharge region for discharging the refrigerant to the refrigeration cycle is configured, and at least the suction chamber 33 and the suction port portion 35 described above are included, thereby forming a suction region for sucking refrigerant from the refrigeration cycle.

  By the way, in this embodiment, as shown in FIG. 1, the oil reservoir chamber 53 for temporarily storing the lubricating oil separated from the refrigerant by the oil separation mechanism 44 is configured at the substantially center in the rear housing 4. In addition, as shown in FIGS. 1 and 5, the mounting portion main body 65 as a main component of the mounting portion for mounting the compressor 1 to a mounting foot portion (not shown) of the vehicle is provided at the bottom of the rear housing 4. It is provided on the rear side outer surface of the wall 4c.

  Among these, the attachment portion main body 65 is a rectangular parallelepiped shape provided at a position away from the protrusion portion 4 b of the rear housing 4 with respect to the suction port portion 35, that is, at the center of the rear side outer surface of the bottom wall 4 c of the rear housing 4. One end in the longitudinal direction is substantially at the center of the rear outer surface of the rear housing 4, and the other end in the longitudinal direction crosses the rear housing 4 in the vehicle width direction and reaches the side edge. It has become. The mounting portion main body 65 is provided with a through-hole 66 through which a bolt 67 is inserted, as shown in FIG. 5B, along the longitudinal direction thereof. As shown in FIG. 5B, the bolt 67 includes a seat portion 67a and a bolt body 67b in which a part (for example, 1/3 to 1/4) is threaded.

  Further, when the bolt 67 is inserted from the center side of the rear housing 4 into the through hole 66 of the mounting portion main body 65 on the rear side outer surface of the bottom wall 4 c of the rear housing 4, the mounting portion and the seat portion 67 a of the bolt 67 and An interference avoiding portion 68 for preventing interference with the bolt 67 is provided at a portion through which the bolt main body 67b passes. As shown in FIGS. 1 and 3, the interference avoiding portion 68 has the outer surface of the bottom wall 4 c of the rear housing 4 facing the valve plate 3 side and the inner surface of the bottom wall 4 c of the rear housing 4 facing the valve plate 3 side. It is formed in the shape of a circular arc groove.

  As shown in FIGS. 1 and 3, the oil storage chamber 53 protrudes from the inner surface of the bottom wall 4c of the rear housing 4, and is different from the mounting portion main body 65 and the interference avoiding portion 68 constituting the mounting portion. A chamber 69 formed by inner walls 17 and 54 that are arranged at positions overlapping with each other when viewed from the plate 3 side (the pulley 19 side) and extends substantially parallel to the axial direction of the drive shaft 8 of the compressor 1 is provided. The chamber 69 is opened to the valve plate 3 side, and the opening of the chamber 69 is closed by the cover member 55 from the valve plate 3 side. The tip of the inner wall 54 on the pulley 19 side does not reach the valve plate 3 as shown in FIGS.

  As a result, no matter where the mounting portion 65 or the interference avoiding portion 68 provided on the rear side outer surface of the bottom wall 4c of the rear housing 4 is located at the center of the rear side outer surface of the bottom wall 4c of the rear housing 4, etc. When the storage chamber 53 is configured in the rear housing 4, interference from the mounting portion 65 and the interference avoiding portion 68 is not received.

  As shown in FIG. 6, the cover member 55 is provided with a stepped portion 56 at the inner peripheral edge of the opening of the inner walls 17, 54, and this stepped portion 56 is provided with an O-ring 59 in order to ensure sealing performance. It is mounted via. Further, a protrusion 55 a is formed on the valve member 3 side of the cover member 55, and the protrusion 55 a comes into contact with the surface of the valve plate 3 when the cover member 55 is attached. However, if the sealing performance is ensured, press-fitting may be employed without the O-ring 59, thereby simplifying the structure of the compressor 1 and reducing the number of components.

  As described above, the protrusion 55a of the cover member 55 abuts against the valve plate 3 and pushes it, so that the cover member 55 can be prevented from coming off and the close contact between the valve plate 3 and the gasket can be enhanced.

  The cover member 55 is provided with an orifice 57 and a filter mechanism 58 for returning to the suction chamber 33 after removing foreign matters such as contaminant powder in the lubricating oil stored in the oil storage chamber 53. Yes. As shown in FIG. 6, the filter mechanism 58 is provided with a bottomed recess 60 from the oil storage chamber 53 side of the cover member 55 toward the valve plate 3, and the periphery is formed by a metal fitting 61 having a substantially U-shaped cross section. The covered filter body 62 is mounted in the recess 60.

  The orifice 57 is a fixed orifice formed by a thin linear through hole bored in the bottom portion of the recess 60, and communicates the recess 60 of the oil reservoir chamber 53 with the suction chamber 33.

  With such a configuration of the oil storage chamber 53, the oil in the oil storage chamber 53 is returned to the suction chamber 33 from the orifice 57 after foreign matters such as contaminant powder are removed by the filter mechanism 58 of the cover member 55. It is.

  In this embodiment, as described above, the compressor 1 is configured such that the suction chamber 33 is provided at the center side of the rear housing 4 and the discharge chamber 34 is provided around the suction chamber 33. An oil storage chamber 53 is provided by forming an inner wall 54 in the chamber 33, but a discharge chamber 34 is provided at the center side of the rear housing 4, and a suction chamber 33 is provided around the discharge chamber 34. In the case of this configuration, although not shown, the oil storage chamber 53 may be provided by forming the inner wall 54 in the discharge chamber 34.

  In this embodiment, a clutchless swash plate type variable displacement compressor using a single-head piston 13 is shown. However, the present invention is not limited to this compressor, and although not shown, a double-head piston is used. It is also possible to use a vane type compressor.

1 Compressor 2 Cylinder block (housing member)
3 Valve plate (housing member)
4 Rear housing (housing member)
4a Communication path 4c Bottom wall 5 Crank chamber 6 Front housing (housing member)
7 Housing 8 Drive shaft 19 Pulley 43 Communication path 44 Oil separation mechanism 45 Inner wall 46 Room 46a Large diameter room part 46b Small diameter room part 46c Rear side room part 47 Oil separation cylinder 48 Lid body 49 Main body 49a Cylindrical part 49b Cylindrical part 49c Flange 50 Communication path 52 Through hole 53 Oil storage chamber 54 Inner wall 55 Cover member 55a Projection part 56 Step part 57 Orifice 58 Filter mechanism 65 Mounting part 66 Through hole 67 Bolt 67a Seat part 67b Bolt body 68 Interference avoiding part

Claims (6)

A housing composed of a plurality of housing members, a drive shaft that is rotatably supported by the housing and rotated by an external driving force via a pulley, and the rotational motion of the drive shaft is converted into a compression action of the heat exchange medium. A compressor having a compression mechanism for
Of the plurality of housing members, a rear housing provided on the opposite side of the pulley is discharged with a suction chamber into which a heat exchange medium is sucked from outside the housing and a heat exchange medium compressed by the compression mechanism. A discharge chamber, an oil separation mechanism for separating the lubricating oil mixed in the heat exchange medium discharged into the discharge chamber from the heat exchange medium, and an oil for storing the lubricating oil separated from the heat exchange medium by the oil separation mechanism There is a storage room,
The compressor is characterized in that the oil storage chamber has an opening portion opened to the pulley side of the rear housing, and the opening portion is closed from the pulley side by a cover member.   2. The oil storage chamber is formed by projecting the inner wall of the rear housing from the inner surface of the bottom wall of the rear housing toward the pulley side. The compressor described in 1.   An attachment portion for attaching the compressor to a predetermined structure of the vehicle is provided on the outer surface of the bottom wall of the rear housing, and the radial position of the attachment portion is at least partially through the bottom wall of the rear housing. The compressor according to claim 1, wherein the compressor is disposed so as to overlap with a radial position of the oil storage chamber.   The compressor according to any one of claims 1 to 3, wherein the lubricating oil separated from the heat exchange medium by the oil separation mechanism is discharged into the suction chamber. The compressor according to any one of claims 1 to 4, wherein the cover member is formed with an orifice that communicates the oil reservoir chamber with a region outside the oil reservoir chamber.
  The suction chamber and the discharge chamber are such that the suction chamber is located on the center side of the rear housing, the discharge chamber is formed in an annular shape around the suction chamber, and the oil reservoir chamber is The compressor according to any one of claims 1 to 5, wherein the compressor is located below the separation mechanism.

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