JP2010077873A - Variable displacement compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable displacement compressor capable of precluding the occurrence of wear dust by preventing the outer race of a bearing from turning together with a lug plate. <P>SOLUTION: The variable displacement compressor 100 is equipped with a housing 1 and a compressing mechanism 2 installed inside the housing 1 for compressing a refrigerant, wherein the mechanism 2 is provided with a swash plate 4 coupled with a piston 3, the lug plate 6 transmitting the rotational driving force from engine to the swash plate 4 through a drive shaft 5, and the bearing 8 supporting the lug plate 6 on the inner wall 7 of the housing 1 rotatably, wherein the bearing 8 has the outer race 10a supported on the bearing supporting wall 9 of the housing 1, and the bearing supporting wall 9 is furnished with a groove 12 for supplying the oil, having a smaller diameter than the outer diameter of the outer race 10a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a variable displacement compressor in which a lug plate is rotatably supported on an inner wall of a housing via a bearing.

  Patent Document 1 discloses a swash plate type variable capacity compressor. This variable capacity compressor includes a casing (housing) and a compression mechanism that is disposed in the housing and compresses the refrigerant. The compression mechanism includes a swash plate connected to the piston, a swash plate support arm (lug plate) that transmits the rotational driving force from the engine to the swash plate via a drive shaft, and the lug plate that rotates to the inner wall of the housing. It has a thrust bearing (bearing) that supports it freely.

  Then, the rotational driving force from the engine is transmitted to rotate the driving shaft, and the lug plate fixed to the driving shaft rotates while being supported on the inner wall of the housing via the bearing, thereby rotating the swash plate. By reciprocating the piston in the axial direction of the housing, the refrigerant is compressed in the cylinder bore. Since the lug plate is supported on the inner wall of the housing via the bearing, the frictional resistance is reduced, and the lug plate can be smoothly rotated.

The bearing is formed with a plurality of rollers interposed between the inner race portion on the lug plate side and the outer race portion on the inner wall side of the housing. Oil circulating in the housing flows into the inner race portion and the outer race portion and is lubricated.
JP-A 63-205470

  However, the outer race portion originally fixed to the inner wall of the housing rotates with the lug plate, so that the outer race portion slides on the inner wall of the housing and wear powder is generated.

  In addition, when wear powder is generated, the wear powder may be scattered in the housing and impair the function of the compressor.

  Accordingly, an object of the present invention is to provide a variable displacement compressor that can prevent the outer race portion of the bearing from being swung by the lug plate and prevent the generation of wear powder.

  The invention described in claim 1 includes a housing 1 and a compression mechanism 2 disposed in the housing 1 for compressing the refrigerant. The compression mechanism 2 includes a swash plate 4 connected to a piston 3, and 4 includes a lug plate 6 that transmits the rotational driving force from the engine via the drive shaft 5, and a bearing 8 that rotatably supports the lug plate 6 on the inner wall 7 of the housing 1. A variable capacity compressor 100 having an outer race portion 10a supported by the bearing support wall 9 of the housing 1, wherein the groove 12 is supplied with oil with a diameter smaller than the outer diameter of the outer race portion 10a. It is characterized by providing.

  The invention according to claim 2 is the variable displacement compressor 100 according to claim 1, wherein the inner peripheral end 13 and the outer peripheral end 14 in the radial direction of the outer race portion 10 a are in contact with the bearing support wall 9. It is characterized by being.

  According to the present invention, the bearing support wall is provided with a groove having a diameter smaller than the outer diameter of the race portion, and oil is supplied to the groove, whereby the race portion can be prevented from rotating and sliding with the housing. Therefore, no abrasion powder is generated between the race and the housing. Furthermore, the compressor can be reduced in weight by providing a groove.

  Hereinafter, the details of the variable displacement compressor according to the present invention will be described based on the embodiments shown in the drawings.

  FIG. 1 is an overall sectional view of a variable displacement compressor 100 of the present invention. FIG. 2 is a cross-sectional view taken along line XX in FIG. FIG. 3 is an enlarged cross-sectional view of a main part of the variable displacement compressor 100.

  As shown in FIG. 1, the variable displacement compressor 100 of this embodiment includes a housing 1 and a compression mechanism 2 that is disposed in the housing 1 and compresses the refrigerant. The compression mechanism 2 is connected to a piston 3. A swash plate 4, a lug plate 6 that transmits a rotational driving force from the engine to the swash plate 4 via a drive shaft 5, and a bearing 8 that rotatably supports the lug plate 6 on the inner wall 7 of the housing 1. The bearing 8 has a race portion 10 supported by the bearing support wall 9 of the housing 1.

  The housing 1 includes a front housing 1a in which a crank chamber 15 is formed, a cylinder block 1b in which a plurality of cylinder bores 16 are formed coupled to the front housing 1a, a cylinder block 1b, and a refrigerant compressed in the cylinder bore 16 The rear housing 1c includes a high-pressure chamber 17 for discharging and a low-pressure chamber 18 into which refrigerant is sucked into the cylinder bore 16.

  In the front housing 1a of the present embodiment, a groove 12 is provided in the inner wall 7 of the cylinder with which a race portion 10 to be described later contacts.

  A plurality of cylinder bores 16 are formed in the cylinder block 1b. The plurality of cylinder bores 16 are formed at equal intervals on the circumference around the drive shaft 5. A piston 3 is slidably disposed in each cylinder bore 16.

  The low pressure chamber 18 of the rear housing 1c is connected to an outlet side of an evaporator of a refrigeration cycle (not shown). The high pressure chamber 17 is connected to the inlet side of the condenser of a refrigeration cycle (not shown). The low pressure chamber 18 and the high pressure chamber 17 are partitioned by a partition wall 19.

  The compression mechanism 2 has a drive shaft 5 disposed so as to pass through the crank chamber 15. One end of the drive shaft 5 protrudes outside the front housing 1 a, and a pulley that receives the rotational driving force from the engine at the protruding portion. 20 is fixed. The drive shaft 5 rotates by receiving a driving force from the pulley 20 fixed to one end side in this way.

  When the drive shaft 5 rotates, the lug plate 6 provided in the crank chamber 15 and fixed integrally with the drive shaft 5 transmits the driving force to the journal 22 via the link mechanism 21. A swash plate 4 is fixed to the journal 22, and a piston 3 is fixed to an end portion of the swash plate 4. The swash plate 4 is rotated by the rotation of the drive shaft 5 and the piston 3 is reciprocated to compress the refrigerant.

  Next, the lug plate 6, the bearing 8, and the race part 10 will be described in detail with reference to FIGS.

  The lug plate 6 includes a disk-shaped plate main body 23, an arm 24 of a link mechanism 21 that is provided on one side of the plate main body 23 (on the cylinder block 1b side in the assembled state) and is connected to the journal 22. It is formed with a boss portion 25 provided on the other side of the plate body 23 (on the inner wall 7 side of the front housing 1a in the assembled state). An annular bearing 8 is fitted to the boss portion 25.

  The bearing 8 includes an inner race portion 10b that contacts the plate body 23 of the lug plate 6, an outer race portion 10a that contacts the inner wall 7 of the front housing 1a, and a space between the inner race portion 10b and the outer race portion 10a. It is formed with a roller 26. The inner race portion 10 b is formed in an L-shaped cross section with a vertical wall 27 that contacts the plate body 23 and a horizontal wall 28 that contacts the outer periphery of the boss portion 25. The outer race portion 10a is in contact with the inner wall 7 of the front housing 1a.

  As described above, the front housing 1a is provided with the groove 12 having a diameter smaller than the outer diameter of the outer race portion 10a, and the inner peripheral end 13 and the outer peripheral end 14 in the radial direction of the outer race portion 10a are formed into the groove 12. The inner peripheral edge 29 and the outer peripheral edge 30 are in contact with each other.

  As described above, by providing the groove 12, the surface pressure between the outer race portion 10 a and the front housing 1 a is increased, and the outer race portion 10 a can be suppressed from being accompanied with the lug plate 6. Furthermore, since oil can be stored in the groove 12, even if the outer race portion 10a rotates with the lug plate 6, the generation of wear powder can be reduced.

  Moreover, weight reduction can be achieved by providing the groove 12. Furthermore, since excess oil can be stored in the groove 12, stable oil supply to the bearing 8 is possible.

  In the present embodiment, the groove 12 is provided continuously, but may be any groove 12 that prevents the race portion 10 and the lug plate 6 from rotating together. That is, at least one groove 12 may be used.

The whole sectional view of the variable capacity compressor of the present invention. FIG. 2 is a partial sectional view of FIG. Fig.3 (a) is a principal part expanded sectional view of a variable capacity compressor. FIG. 3B is a partially enlarged sectional view of the front housing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Compression mechanism 3 Piston 4 Swash plate 5 Drive shaft 6 Lug plate 7 Inner wall 8 Bearing 9 Bearing support wall 10 Race part 10a Outer race part 11 Small diameter 12 Groove

Claims (2)

A housing (1), and a compression mechanism (2) disposed in the housing (1) for compressing the refrigerant, the compression mechanism (2) including a swash plate (4) coupled to the piston (3); , A lug plate (6) for transmitting the rotational driving force from the engine to the swash plate (4) via the drive shaft (5), and the lug plate (6) on the inner wall (7) of the housing (1). A variable capacity compressor (100) having an outer race portion (10a) supported by a bearing support wall (9) of the housing (1). ) And
A variable displacement compressor (100) characterized in that a groove (12) is provided in the bearing support wall (9) to supply oil with a diameter smaller than the outer diameter of the outer race part (10a). A variable displacement compressor (100) according to claim 1, comprising:
The variable capacity compressor (100), wherein an inner peripheral end (13) and an outer peripheral end (14) in a radial direction of the outer race portion (10a) are in contact with the bearing support wall (9).

Images