KR100715261B1 - Variable displacement swash plate type compressor - Google Patents

Abstract

Disclosed is a variable displacement swash plate type compressor having a high compression efficiency by simplifying and lightening a power transmission structure between a drive shaft and a swash plate. The disclosed invention, front and rear housing (1) (2); A cylinder (3) embedded in the front and rear housings (1) (2) having a plurality of cylindrical bores (3a); A drive shaft 40 having a drive portion 41 having a substantially rectangular cross-sectional structure in the middle thereof and installed in the whole housing 1; Disc-shaped swash plate 60, the whole housing (1) is fitted obliquely to the inclined angle through the through-hole 61 of the non-rotating structure corresponding to the cross-sectional shape of the drive unit 41 to the drive unit 41 A spring (100) for elastically supporting the swash plate (60) in a drive shaft (40) between the inner wall of the front end; A plurality of pistons (8) coupled to the outer circumference of the swash plate (60) via a shoe (7) and reciprocated in each bore (3a) of the cylinder (3) in accordance with the rotation of the swash plate (60); Suction lead 10 and discharge lead 11 for selectively opening and closing the inlet 9a and outlet 9b of each bore 3a by the pressure change in bore 3a according to the reciprocation of the piston 8. ; And a control valve 12 for adjusting a feed amount of the piston 8 by adjusting respective pressures of the suction chamber 2a and the discharge chamber 2b formed in the rear housing 2. The swash plate 60 is driven by a sliding ball 101 interposed between the settle groove 62 formed in the hemispherical shape on both sides of the through hole 61 and the arc-shaped sliding groove 42 formed on both sides of the drive portion 41. The swash plate 60 is coupled to the 41 so as to be rotated along the sliding groove 42, and forms a rear half of the settling groove 62 provided at both sides of the through hole 61 of the swash plate 60. It characterized in that it further comprises a cap 70 is coupled to the back of the.

Compressor, swash plate compressor, variable displacement swash plate compressor,

Description

Variable displacement swash plate compressor {VARIABLE DISPLACEMENT SWASH PLATE TYPE COMPRESSOR}

1 is a cross-sectional view of a conventional variable displacement swash plate compressor.

2 is a cross-sectional view of a variable displacement swash plate compressor according to an embodiment of the present invention.

Figure 3 is an enlarged side cross-sectional view showing only the power transmission structure of the variable displacement swash plate compressor according to an embodiment of the present invention.

4 is a plan sectional view of FIG.

<Description of Symbols for Main Parts of Drawings>

1: all housing 2: rear housing

3: cylinder 3a: bore

8: piston 40: drive shaft

41: drive unit 42: sliding groove

60: Saphan 62, 63: Settlement groove

100: spring 101: sliding ball

102: thrust bearing 103: race

104: flange

The present invention relates to a variable displacement swash plate type compressor capable of compressing a refrigerant by varying the compression capacity in, for example, an air conditioner. More specifically, the power transmission structure between the drive shaft and the swash plate is simplified and lightweight, so that the compression efficiency is increased. In addition, the present invention relates to a variable displacement swash plate compressor in which the weight of the swash plate is balanced around the drive shaft so that the drive shaft does not receive bending moments due to the weight imbalance of the swash plate, and thus the durability of the drive shaft is also greatly improved.

The compressor constituting the air conditioner of the automobile is selectively received by the power of the engine delivered through the pulley by the intermittent action of the electronic clutch to compress the refrigerant in the gaseous phase supplied from the evaporator to a state of high temperature and high pressure that is easy to liquefy and condenser It is a device to discharge.

In the swash plate type compressor used as such a compressor, a disk-shaped swash plate which is inclined to the drive shaft receiving the engine power is rotated by the drive shaft, and the swash plate rotates through the shoe circumference along the circumference of the swash plate. A plurality of coupled pistons are linearly reciprocated in a plurality of bores formed in the cylinder, thereby inhaling, compressing, and discharging the refrigerant gas.

The variable displacement swash plate compressor, which is an improvement of the swash plate compressor, is capable of adjusting the refrigerant compression amount by changing the piston reciprocating amount while the swash plate varies in inclination angle according to the heat load, and the compressor has a refrigerant compression capacity according to the heat load. Control valves are used to control this.

An example of such a variable displacement swash plate compressor is shown in cross section in FIG. 1 of the accompanying drawings.

As shown, the variable displacement swash plate type compressor includes a front and rear housing (1) (2) and a circumferential direction arranged in the front and rear housing (1) (2) to form a closed space therein. A cylinder block 3 having a plurality of bores 3a formed therein, a drive shaft 4 disposed in the longitudinal direction at the center of the cylinder block 3 so as to be rotatably supported by the whole housing 1, and the drive shaft A disc-shaped lug plate 5 which is constricted to (4) and rotates together with the drive shaft 4, and is fitted to the drive shaft 4 and one end is hinged to one end of the lug plate 5 so that the lug plate 5 And a swash plate 6 which is slid in an axial direction along the drive shaft 4 while being rotated together with the swash plate 6, and is fixed at predetermined intervals through a shoe 7 on the outer circumference of the swash plate 6. Reciprocating movement in each bore 3a of the cylinder block 3 in accordance with the rotation of the swash plate 6 A plurality of pistons 8, and suction leads 10 and discharge leads for opening and closing the inlet port 9a and the outlet port 9b of the valve plate 9 by a pressure change according to the reciprocation of the piston 8. (11) and the like, in addition, the pressure of the crank chamber (1a) of the front housing (1), the suction chamber (2a) and the discharge chamber (2b) of the rear housing (2) by adjusting the pressure of the piston (8) A control valve 12 for adjusting the feed amount, and a spring 13 which is installed between the lug plate 5 and the swash plate 6 to elastically support the swash plate 6 with respect to the lug plate 5. .                         

According to the above configurations, the conventional variable displacement swash plate type compressor compresses the refrigerant transferred from the evaporator through the following process and sends the compressed refrigerant to the condenser.

When the drive shaft 4 rotates with the power of the engine, the lug plate 5 condensed on the drive shaft 4 rotates with the swash plate 6, and the pistons 8 provided at the edges of the swash plate 6 are swash plate 6. By rotative rotation, the cylinder reciprocates in the bore 3a of the cylinder 3 by a distance proportional to the inclination angle of the swash plate 6. At this time, the pressure of the bore 3a is lowered while the piston 8 moves backward (moving in the left direction in FIG. 1) to the bottom dead center, so that the refrigerant in the suction chamber 2a passes through the inlet 9a ( 3a) and when the piston 8 reaches the bottom dead center and then moves forward again, the refrigerant introduced into the bore 3a is compressed by the pressure of the piston 8 and is discharged through the outlet 9b under high pressure. Discharged to (2b). Then, the high pressure refrigerant discharged to the discharge chamber 2b is discharged to the condenser (not shown) through the refrigerant passage.

However, the variable displacement swash plate type compressor for a conventional air conditioner that compresses the refrigerant by the above-described action has the arms 5a in which the lug plate 5 and the swash plate 6 are integrally formed on their respective circumferences ( 6a) are hinged to each other and the drive shaft 4 has a number of problems, such as a separate spherical sleeve (14) to allow the swash plate (6) to slide smoothly.

First, since a separate lug plate (5) is required, the construction and its structure are complicated, which makes it difficult to design and manufacture, which makes manufacturing costs considerably high.

Second, due to the weight of each arm (5a) (6a) hinged to the lug plate (5), not only is the weight to be rotated by the drive shaft (4), but also the swash plate (6) during sliding inclination of the swash plate (6) The frictional area due to sliding inclination of the swash plate 6 is large, such as friction between the spherical sleeve 14 and the spherical sleeve 14 and the support 6b of the swash plate 6 against the lug plate 5. The load on 4) is large. As a result, the power consumption is large, so the compression efficiency is low.

And, third, the weight that is applied to the drive shaft 4 due to the weight of the hinge mechanism constituting arms 5a and 6a interposed between the lug plate 5 and the swash plate 6 is separated from the drive shaft 4. Since it is biased toward the field 5a, 6a, the weight biased at high rotation causes an unbalance of the centrifugal force with respect to the drive shaft 4, and a considerable amount of bending moment is applied to the drive shaft 4. For this reason, there also exists a problem that the durability of the drive shaft 4 is bad.

As described above, the variable displacement swash plate compressor for the air conditioner has various problems as described above because a separate lug plate 5 should be used.

Thus, the present invention, the problems with the conventional variable displacement swash plate compressor as described above has been eliminated, and by adopting a simple and lightweight power transmission structure that does not use a lug plate between the drive shaft and the swash plate, Compression efficiency is high because the load is small, and the weight of the swash plate is balanced toward the center of the drive shaft, so that the bending moment is not applied to the drive shaft due to the weight imbalance of the swash plate, which greatly improves the durability of the drive shaft. It aims to provide.

The variable displacement swash plate compressor of the present invention for achieving the above object, the front and rear housings to form a closed space; A cylinder block having a plurality of cylindrical bores in the front and rear housings; A drive shaft installed through the whole housing in the longitudinal direction of the cylinder block and rotatably supported by the whole housing, the driving shaft having a driving portion having a substantially rectangular cross-sectional structure in the middle thereof; A disk-shaped swash plate formed at a center thereof with a through hole corresponding to a cross-sectional shape of the driving unit, pivoting at a point spaced apart from the driving shaft by a rotational center, and being obliquely fitted to the driving unit such that its inclination angle is variable; A spring fitted around a drive shaft between the swash plate and the front inner wall of the whole housing to elastically support the swash plate against the whole housing; A plurality of pistons coupled to an outer circumference of the swash plate via a shoe and reciprocating in each bore of the cylinder block according to the rotation of the swash plate; And a control valve for adjusting the pressure of the crank chamber formed by the space between the whole housing and the cylinder block,
The swash plate is coupled to the driving unit by a sliding ball interposed between the settle grooves formed in a hemispherical shape on both sides of the through-hole of the swash plate and the arc-shaped sliding grooves formed on both sides of the driving unit so that the swash plate rotates along the sliding groove. It characterized in that it further comprises a cap coupled to the rear of the swash plate while forming a rear half of the settling groove provided on each side of the ball.

In such a variable displacement swash plate compressor of the present invention, it is preferable that the transverse section of the drive section and each of the through holes of the swash plate each have a rectangular cross section.

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In addition, a swash plate departure prevention flange having a larger cross-sectional area than the through hole of the swash plate is further installed at the rear end of the driving unit, and a part of the upper portion of the rear end of the driving unit is cut in an arc shape along the moving path of the upper surface of the through hole of the swash plate. Excluded.

The variable displacement swash plate compressor for an air conditioner according to the present invention having the above configuration is a power transmission medium between the drive shaft and the swash plate, which not only causes the weight to be biased to one side, but also has a complicated power medium structure. The lug plate that should be used is not used, and a simple, lightweight and unbiased power transmission structure consisting of a drive part having a non-rotating body structure of the drive shaft and a swash plate through hole corresponding to the cross-sectional shape of the drive part is used. The load on the drive shaft is small, and the weight of the swash plate is balanced around the drive shaft.

Hereinafter, with reference to the preferred embodiments of the present invention shown in the accompanying drawings looks at in more detail the features and functions of the components of the present invention.

In the following description of the present embodiment, the same reference numerals are used for the configurations of the present invention, which are the same as those of the prior art described for clarity, and only the parts which are improved so as not to overlap with the prior art will be described.                     

2 is a cross-sectional view showing the internal structure of a variable displacement swash plate compressor according to an embodiment of the present invention.

As shown, the variable displacement swash plate compressor according to the present invention, front and rear housing (1) (2) and; A cylinder (3) embedded in the front and rear housings (1) and (2); A drive shaft 40 supported by the all-housing 1; A disc-shaped swash plate 60 installed on the drive shaft 40; A spring (100) for elastically supporting the swash plate (60) with respect to the inner wall of the front end of the whole housing (1); A plurality of pistons (8) coupled to the outer circumference of the swash plate (60) via a shoe (7) and reciprocated in each bore (3a) of the cylinder (3); A valve plate (9) for sealing each bore (3a) of the cylinder (3) at the rear end face of the cylinder (3); Suction lead 10 and discharge lead 11 for selectively opening and closing the inlet port 9a and outlet port 9b of the valve plate 9 by the pressure change in the bore 3a according to the reciprocation of the piston 8. Wow; The pressure of the suction chamber 2a and the discharge chamber 2b formed in the rear housing 2 by the crank chamber 1a in front of the cylinder 3 inside the whole housing 1 and the valve plate 9 is divided. And a control valve 12 for adjusting the feed amount of the piston 8.

In the variable displacement swash plate compressor according to the present invention having the above-described configuration, in particular, a drive unit 41 having a rectangular cross section is formed in the center of the drive shaft 40, and the drive unit 41 is provided on both sides of the drive unit 41. An arc-shaped sliding groove 42 having a center of curvature at a predetermined point spaced outward from the axis of the drive shaft 40 is formed. In addition, the linear sliding groove 43 in the axial direction is formed on the upper surface of the driving part 41. The upper portion of the rear end of the driving part 41 is cut out by a circular arc concentric with the sliding groove 42 is excluded.

In the center of the swash plate 60, a through hole 61 is formed in the swash plate 60 in a direction inclined with respect to the axial direction while having the same shape as the cross section of the driving unit 41. The front half of the settled grooves 62 and 63 are formed at the rear end edges of both side surfaces and the upper surface of the through hole 61, and the fixing portion 64 has a predetermined thickness around the through hole 61. Extruded.

In addition, the rear surface of the swash plate 60 has the same through hole 71 as the through hole 61 of the swash plate 60, and the upper and both front edges of the through hole 71 of the swash plate 60. A cap 70 having hemispherical grooves corresponding to the settle grooves 62 and 63 is provided to the fixing portion 64 of the swash plate 60 via the sliding ball 101 through the settle grooves 62 and 63. Fitted and combined.

Thus, the swash plate 60 to which the cap 70 is coupled, as shown in Figs. 3 and 4, the thrust bearing 102 and the race 103, and the spring between the front inner wall of the whole housing (1) The driving part 41 of the drive shaft 40 of the drive shaft is inserted with the intervening portion 100 interposed therebetween and is driven along the sliding groove 42 of the drive shaft 40 by the action of the sliding balls 101 of the settle grooves 62 and 63. Sliding in arc shape. At this time, the flange 104 prevents the swash plate 60 from being separated from the driving part 41.

With the power transmission structure as described above, the rotational force of the drive shaft 40 is directly transmitted to the swash plate 60 through the drive unit 41, the swash plate 60 is rotated by the drive unit 41 and at the same time before and after the piston 8 It is rotated along the sliding groove 42 by the sliding action of the sliding ball 101 by the pressure difference and the restoring force of the spring 100.

The power transmission structure between the drive shaft 40 and the swash plate 60 has a separate power mediating means such as a lug plate (symbol 5 in FIG. 1) having a heavy weight and a load biased on both sides of the drive shaft. Therefore, the load according to the weight on the drive shaft 40 can be greatly reduced, and the centrifugal force unbiased on the drive shaft 40 is exerted. Therefore, the compression efficiency of the compressor can be increased, and the bending moment due to the unbalance of the centrifugal force is hardly applied to the drive shaft 40, thereby increasing the durability of the drive shaft 40.

According to the variable displacement swash plate compressor of the present invention as described above, since the power transmission structure between the drive shaft 40 and the swash plate 60 can be reduced in weight and the friction acting on the swash plate 60 can be minimized. Compression efficiency can be greatly increased compared to the power of the compressor.

In addition, since the power transmission structure has a weight distributed evenly with respect to the drive shaft, the bending moment with respect to the drive shaft is not acted on by the centrifugal force unbiased during rotation, thereby greatly improving the durability of the drive shaft.

In addition, the configuration and structure of the power transmission structure is very simple, making each part easy to manufacture and assembly, thereby reducing the manufacturing cost of the compressor.

On the other hand, while the above has been shown and described with respect to preferred embodiments of the present invention, the present invention is not limited to the above-described embodiment, the field to which the invention belongs without departing from the spirit of the invention claimed in the claims below. Anyone of ordinary skill in the art that various modifications can be made, of course, such modifications are within the scope of the claims.

Claims (7)

Front and rear housing (1) (2) to form a closed space; A cylinder block (3) embedded in the front and rear housings (1) (2) with a plurality of cylindrical bores (3a); The drive shaft 40 is installed in the longitudinal direction of the cylinder block 3 through the whole housing 1 so as to be rotatably supported by the all housing 1, and has a driving portion 41 having a rectangular cross-sectional structure in the middle thereof. ; The through hole 61 corresponding to the cross-sectional shape of the drive unit 41 is formed at the center thereof, and the drive unit 41 is pivoted at a point spaced apart from the drive shaft 40 by a rotational center so that its inclination angle is variable. Disc-shaped swash plate 60 is fitted obliquely to; A spring 100 fitted around the drive shaft 40 between the swash plate 60 and the front inner wall of the whole housing 1 to elastically support the swash plate 60 with respect to the whole housing 1; A plurality of pistons (8) coupled to the outer circumference of the swash plate (60) via a shoe (7) and reciprocated in each bore (3a) of the cylinder block (3) in accordance with the rotation of the swash plate (60); And, And a control valve 12 for adjusting the pressure of the crank chamber 1a formed by the space between the whole housing 1 and the cylinder block 3, The swash plate by the sliding ball 101 interposed between the settle groove 62 formed in the hemispherical both sides of the through hole 61 of the swash plate 60 and the arc-shaped sliding groove 42 formed on both sides of the drive unit 41. 60 is coupled to the drive unit 41 so as to rotate along the sliding groove 42, Variable further characterized in that it further comprises a cap 70 coupled to the rear of the swash plate 60 while forming a rear half of the settled grooves 62 respectively provided on both sides of the through hole 61 of the swash plate 60. Capacitive swash plate compressor. The method of claim 1, Cross section of the drive unit 41 and each of the through holes 61 of the swash plate 60 has a variable displacement swash plate type compressor, characterized in that each has a rectangular cross section. delete The method of claim 1, The sliding plate 101 is interposed between the settling groove 63 formed in the upper surface of the through hole 61 of the swash plate 60 and the sliding groove 43 formed in the upper surface of the driving unit 41 so that the swash plate 60 and the driving unit ( A variable displacement swash plate compressor, characterized in that 41) is combined. The method according to any one of claims 1, 2 and 4, A variable displacement swash plate type compressor, characterized in that the swash plate departure prevention flange 104 having a larger cross-sectional area than the through hole 61 of the swash plate 60 is further installed at the rear end of the drive unit 41. delete The method of claim 5, The upper portion of the rear end of the drive unit 41 is cut in an arc shape along the moving path of the upper surface of the through hole 61 of the swash plate 60 is excluded, characterized in that the swash plate type compressor.

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