KR100734805B1 - Swash plate type compressor of variable capacity - Google Patents

Abstract

The present invention is to provide a variable capacity swash plate compressor that can be coupled to the swash plate with a minimum number of parts without using a rotating body, and can improve the productivity by reducing the number of work due to the combination, cylinder with a plurality of bores And a front and rear housing having a cylinder therein to form a crank chamber, a suction chamber and a discharge chamber, a drive shaft rotatably supported by the cylinder and the housing, and reciprocating to each bore of the cylinder. A piston to be installed, a swash plate connected to the piston and its outer circumferential surface via a pair of shoes, at least one arm protruding toward one inner wall of the housing, the hub coupled to the swash plate, and a rotational force of the drive shaft. Drive force transmission means for transmitting to the swash plate through the hub, and interposed between the arm of the hub and the inner wall of the housing It relates to a variable displacement swash plate compressor comprising a support means for supporting the rotation of the plate.

Swash plate, compressor, variable

Description

Swash plate type compressor of variable capacity

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 exploded perspective view showing a state in which the drive shaft and the hub and the swash plate of the variable displacement swash plate compressor according to the present invention.

4 is a perspective view showing a state in which the variable displacement swash plate compressor of FIG.

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

6 is a cross-sectional view showing the operation of the variable displacement swash plate compressor of the present invention.

<Description of the symbols for the main parts of the drawings>

32: front housing 34: rear housing

40: cylinder 44: piston

50: drive shaft 52: long hole

54: stop 56: swash plate support spring

58: drive shaft support spring 60: swash plate

70: hub 72: hub arm

80: support means 82: race                 

84: bearing 90: connecting means

92: connecting pin

The present invention relates to a compressor, and more particularly to a swash plate type variable compressor used in a vehicle air conditioner.

Conventionally, a compressor used in an automotive air conditioner continuously pumps the heat exchange medium by the action of sucking the vaporized heat exchange medium in the evaporator, compressing the sucked heat exchange medium, and discharging the compressed heat exchange medium. do.

Such compressors may be of various kinds, such as a swash plate type, a scroll type, a rotary type, a wobble plate type, and a crank type, depending on the compression method and the driving method.

However, since these compressors have a set capacity, the pumping capacity of the compressor cannot be varied according to the cooling load when used in an automotive air conditioner driven by an engine, thereby causing a large load due to the driving of the compressor.

In order to solve this problem, a variable displacement compressor has been proposed that can vary the discharge capacity of the compressor according to the cooling load of the automotive air conditioner.

A variable displacement swash plate compressor is disclosed in European Patent Publication No. 911523, the cross section of which is shown in FIG.                         

The variable displacement swash plate compressor as shown is a cylinder (12) having a plurality of bores (11), a front housing (13) in which the cylinder (12) is installed and forming a crank chamber, and the front A drive shaft 16 rotatably supported by the housing 13 and the cylinder 12, and a rotor 17 or lug plate mounted to the drive shaft 16 to rotate together with the drive shaft 16; ) And swash plate (18). The swash plate 18 is installed on the drive shaft so as to rotate by itself or to be slidable. The rotating body 17 and the swash plate 13 are connected by a hinge means 20, the hinge means 20 is connected to the rotating body 17 to the rear of the compressor and the first arm 21 and the A swash plate 18 includes a second arm 22 extending toward the first arm 21, wherein the first arm 21 is formed with an open long hole 21a and a second arm 22 with the long hole 21a. A hinge pin 22a coupled to the 21a is installed. In addition, a piston 19 is installed in the bore 11 of the cylinder 12, and the piston 19 is engaged with the swash plate 18 by hemispherical shoes 19a. Herein, the slidable support of the swash plate 18 with respect to the drive shaft 16 is supported by the drive shaft 16 so that a spherical sleeve is slidably supported, and the sleeve has a boss 13b and a pin on which the swash plate 18 is supported. Are combined by.

However, in such a structure, supporting the swash plate 18 on the drive shaft 16 requires a separate spherical sleeve, which leads to an increase in manufacturing cost, and simultaneously causes the boss and the pins of the sleeve and the swash plate to be assembled at the same time. Since it must be combined, a lot of work is required, there is a problem that can not improve the productivity.

In addition, such a structure basically constitutes an inclination angle adjusting structure by pairing two parts of a rotating body and a boss or a hub that supports the swash plate and supports the swash plate to adjust the inclination angle of the swash plate. However, the structure of adjusting the inclination angle of the swash plate by the combination of the rotating body and the hub has a structural limitation that the weight of the rotating body is very heavy and occupies a considerable space, thereby increasing the weight and price of the entire compressor.

The present invention has been made to solve the above problems, without the rotation body for the coupling of the swash plate, so that the hub of the swash plate directly supports the inner wall of the housing, the coupling structure is simple with a minimum of parts, the coupling The purpose of the present invention is to provide a variable capacity swash plate compressor that can improve productivity by reducing the number of labors.

Another object of the present invention is to provide a variable displacement swash plate type compressor which can stably transmit the rotational force of the drive shaft to the swash plate.

In order to achieve the above object, the present invention provides a cylinder having a plurality of bores, and a front and rear housings having a cylinder therein and forming a crank chamber, a suction chamber and a discharge chamber, A drive shaft rotatably supported by the drive shaft, a piston installed reciprocally in each bore of the cylinder, a swash plate connected to the piston and its outer circumferential surface via a pair of shoes, and at least protruding toward one inner wall of the housing. A hub having one or more arms and coupled to the swash plate, a driving force transmitting means for transmitting the rotational force of the drive shaft to the swash plate through the hub, and being interposed between the arm of the hub and the inner wall of the housing to support the rotational movement of the swash plate. It provides a variable capacity swash plate compressor comprising a means.

According to another feature of the invention, the driving force transmission means may comprise a long hole formed along the axial direction on the drive shaft and pins installed in the direction perpendicular to the hub in the hub.

According to another feature of the invention, the support means may comprise a race tightly fixed to the inner wall of the front housing, a bearing interposed between the arm of the hub and the race, and also of the hub The arm may have a concave surface whose tip corresponds to the bearing.

According to another feature of the invention, the length of the long hole may be formed to support the maximum, minimum inclination angle of the swash plate.

According to another feature of the invention, the race may be provided with an inclined surface in order to reduce the top dead center position change amount of the piston according to the change of the inclination angle, that is, the top-clearance change amount of the piston, the bearing is also a spherical surface And an equilibrium surface.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a view showing a cross section of the swash plate variable compressor according to an embodiment of the present invention. The compressor according to the present invention includes a cylinder 40 having a plurality of bores 42 and a cylinder 40 therein, the front housing 32 and the rear housing forming a crank chamber, a suction chamber and a discharge chamber. 34 is provided. In addition, the drive shaft 50 is rotatably supported at the center of the cylinder 40 and the housing, and the piston 44 is installed at each bore 42 of the cylinder to reciprocate. The pistons 44 coupled to the swash plate ends are reciprocated in the bore 42 as the swash plate 60 is coupled to the end of the piston 44 and the swash plate 60 rotates around the tilted rotation axis. Done. A shoe 46 is interposed between the piston 44 and the swash plate 60 to reduce friction. At the boundary between the cylinder 40 and the rear housing 34, a valve assembly having valves for controlling suction and discharge according to the reciprocating motion of the piston is installed.

In the swash plate type variable compressor according to the present invention, the swash plate 60 does not need a separate rotor, and the hub 70 coupled through the driving shaft 50 and the driving force transmission means 90 is The inner wall of the front housing 32 is directly supported by the support means 80.

The support means 80 to which the hub 70 supports the front housing 32 according to the preferred embodiment of the present invention includes a race 82 fixed to the inner wall of the front housing 32 and the front housing 32. At least one hub arm 72 protruding toward the inner wall of the (), and a bearing 84 interposed between the race 82 and the hub arm 72. Therefore, the hub 70, which is connected to the drive shaft 50 and rotates as the drive shaft rotates, has a shape in which the hub arm 72 rotates while supporting the inner wall of the front housing 32, between the race 82 and The bearing 84 is interposed to allow rotation without friction. According to a preferred embodiment of the present invention, the bearing 84 of the support means 80 may have a spherical surface and an equilibrium surface. In other words, it may have a shape of the shoe 46 interposed between the piston 44 and the swash plate 60.                     

In addition, the stop shaft 54 is formed in the drive shaft 50 near the inner wall of the front housing 32 to prevent the drive shaft 50 from being pushed, the front housing 32 of the friction with the stop 54 The inner wall is to reduce the friction caused by the rotation of the drive shaft 50 via the bearing member 86. The drive shaft 50 is connected to the hub 70 of the swash plate 60 through the drive force transmission means 90, the drive force transmission means 90 and the long hole 52 formed along the axial direction on the drive shaft 50 and And a connecting pin 92 installed at right angles to the hub 70 so that the hub 70 and the driving shaft 50 can be pinned by the connecting pin 92. Then, a swash plate support spring 56 is interposed between the back of the stop 54 of the drive shaft 50 and the inside of the hub 70 to support the hub 70 from the drive shaft 50 with a constant force. Since the drive shaft support spring 58 is interposed between the rear end of the cylinder 50 and the cylinder 40 to push the drive shaft 50, the hub 70 connected along the long hole 52 and the connecting pin 92 is always located in the front housing. The close contact between the race 82, the bearing 84, and the hub arm 72 is maintained even when the vehicle is pushed toward the inner wall of the (32). The adhesion force becomes the elastic force of the swash plate supporting spring 56 in a state in which the inclination angle of the swash plate 60 as shown in the figure, that is, the angle between the swash plate 60 and the direction perpendicular to the drive shaft 50 is minimum.

3 and 4 will be described in more detail the coupling relationship between the drive shaft 50 and the hub 70 of the present invention. The swash plate support spring 56 is fastened to the drive shaft 50 provided with the long hole 52 and the stop 54, and the hub 70 is fastened so that the long hole 52 of the drive shaft 50 is connected by the connecting pin 92. After being fastened to, the swash plate 60 is coupled to the rear of the hub 70. The swash plate 60 and the hub 70 may be integrally formed. The hub arm 72 is provided with a concave surface 74 corresponding to the bearing 84 so as to support the bearing 84, and supports the race 82 with the bearing 84 interposed therebetween. . According to a preferred embodiment of the present invention as shown in the figure, the hub arm 72 has one, but it is also preferably provided with two or more.

First and second planar portions 57 and 58 are formed on both side surfaces of the drive shaft 50 constituting the driving force transmission means 90, and the long holes 52 are formed at portions where the first and second planar portions are formed. Is formed. The portion in which the long hole 52 is formed is preferably formed such that the diameter in the direction perpendicular to the long hole 52 (diameter in the vertical direction) is relatively larger than the diameter in the horizontal direction to have sufficient mechanical strength. In addition, the inner surface coupled to the long hole 52 of the drive shaft 50 formed in the central portion of the hub 70, the third and fourth planar portions 74 and 76 corresponding to the first and second planar portions 57 and 58. Is formed, and a coupling hole 94 is formed at a portion of the hub 70 to be coupled thereto. As a result, the flat parts formed on the driving shaft 50 and the hub 70 may reduce the load on the connection pin 92 during rotation.

The combined hub 70 moves in the race 82 direction along the long hole 52 of the drive shaft 50 when the inclination angle of the swash plate 60 increases, so that the hub arm 72 also supports its position. Is moved to the periphery of the race 82. The hub 70 moved in this way is stopped at the end of the race 82 direction of the long hole 52, the inclination angle of the swash plate 60 is the maximum. Therefore, the length of the long hole 52 is preferably formed to support the maximum and minimum inclination angle of the swash plate 60. Therefore, in the swash plate type variable compressor according to an exemplary embodiment of the present invention shown in FIG. It can be seen that it represents. As described above, in order to change the inclination of the hub 70 while moving along the long hole 52, the coupling hole 73 coupled to the driving shaft 50 of the hub 70 is formed in the third and fourth planes. It is preferable that the length of the portion other than the portions 74 and 76 is longer than the diameter of the portions other than the first and second planar portions 57 and 58 of the drive shaft 50.

5 is a cross-sectional view showing another preferred embodiment of a variable displacement swash plate compressor according to the present invention.

As can be seen in the figure, according to a preferred embodiment of the present invention can be formed so that the race 82 has an inclined surface. In this way, the inner wall of the front housing 32 may also be inclined to correspond to the race 82 having the inclined surface. The race 82 is formed to have an inclined surface in order to reduce the position change of the top dead center position of the piston 44 according to the change of the inclination angle, which is to adjust the top clearance of the piston 44.

Next, the operation of the swash plate variable compressor according to the present invention having the configuration as described above will be described with reference to the accompanying drawings.

Referring to FIG. 6, first, the connecting pin 92 for coupling the hub 70 and the drive shaft 50 is positioned at the end of the race 82 in the long hole 52, and the hub arm 72 is also race 82. When the drive shaft 50 is rotated while supporting the periphery of the hub 70, the hub 70 is coupled to the drive shaft 50 to rotate the swash plate 60 having a predetermined inclination angle. Therefore, the pistons 44 supported at the end of the swash plate 60 with the shoes 46 interposed therebetween reciprocate linearly in the bore 42 of the cylinder 40. Accordingly, the refrigerant gas is sucked into the bore from the suction chamber of the rear housing 34 through the suction port of the valve unit and then compressed into the discharge chamber through the discharge port of the valve unit. On the other hand, as the hub 70 supporting the swash plate 60 rotates, the hub arm 72 supporting the inner wall of the front housing 32 also rotates, and the hub arm 72 has its concave surface 78. It will rotate on the race 82 in the form of supporting the bearing (84). This can be more clearly seen with reference to FIG. 4.

When the pressure in the compressor suction chamber is increased due to the increase in the cooling load of the air conditioning system in the above-described process, the compressed gas flowing into the crank chamber from the discharge chamber is blocked by a separate pressure adjusting means (not shown). Will lower the pressure.

In this way, the control force acting on the piston 44 in the crank chamber is reduced due to the lower pressure (control pressure) of the crank chamber, and the control force transmitted to the hub 70 through the swash plate 60 is a concave surface 78 As a result, the inclination angle of the swash plate 60 is reduced since the clockwise rotational force is reduced.

In the process of decreasing the inclination angle of the swash plate 60, the hub 70 supported by the swash plate 60 is supported by the driving shaft 50 by the driving force transmission means 90, so that the rotation center of the swash plate 60 does not change. It is moved along the drive shaft 50. A long hole 52 is formed in the drive shaft 26 in the longitudinal direction thereof, and a connection pin 92 connected to the hub 70 is coupled to the long hole 52, so that the inclination angle of the swash plate 60 decreases. 92 is moved to the end in the direction of the rear housing 34 of the long hole 52. Therefore, the hub 70 on which the swash plate 60 is supported is moved while being rotated along the drive shaft 50 without changing the rotation center. Meanwhile, first and second planar portions 57 and 58 are formed at a portion where the long hole 52 of the driving shaft 50 is formed, and third and fourth planar portions are formed on the inner surface of the coupling portion corresponding to the hub 70. Since the 74 and 76 are formed, the rotational torque of the driving shaft 50 can minimize the bending moment acting on the pin 92 when the rotational torque of the driving shaft 50 is transmitted to the hub 70 on which the swash plate 60 is supported. At this time, as the hub 70 is rotated along the drive shaft and moved along the long hole 52, the rotation axis of the hub 70 gradually changes, and thus, the rotation axis of the swash plate 60 changes.

As the hub 70 moves according to the pressure change, the return position on the race 82 of the hub arm 72 is also changed. Referring to FIG. 2, the connecting pin 92 gradually becomes a rear housing ( It can be seen that as it moves toward 34, the hub arm 72 also moves gradually toward the center of rotation on the race 82. Of course, a bearing 84 is interposed between the hub arm 72 and the race 82 so that the movement can be kept smooth. In this way, when the position of the connecting pin 92 is positioned to the end of the rear housing 34 of the long hole 52 as shown in FIG. 2, the inclination angle of the swash plate 60 is minimized, and the piston 44 has its straight reciprocating. The exercise will maintain the set minimum.

According to the present invention having the above-described configuration, the structure for adjusting the inclination angle of the swash plate can be simplified by not providing the rotating body, thereby reducing the weight and increasing the miniaturization of the heat exchanger.

The simple structure also reduces the assembly process and improves productivity.                     

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Could be. Therefore, the true technical scope of the present invention should be defined by the claimed claims.

Claims (7)

A plurality of bores formed cylinders; A front and rear housing having the cylinder therein and defining a crank chamber, a suction chamber and a discharge chamber; A drive shaft rotatably supported by the cylinder and the housing; Pistons reciprocally installed in each bore of the cylinder; A swash plate connected to the piston and its outer circumferential surface via a pair of shoes; A hub having at least one arm protruding toward one inner wall of the housing and coupled to the swash plate; Drive force transmission means for transmitting the rotational force of the drive shaft to the swash plate through the hub; And support means interposed between the arm of the hub and the inner wall of the housing to support the rotational movement of the swash plate. The method of claim 1, The driving force transmitting means is a variable displacement swash plate compressor comprising a long hole formed along the axial direction on the drive shaft and a pin installed in the direction perpendicular to the shaft. The method of claim 1, The support means is a variable displacement swash plate compressor comprising a race tightly fixed to the inner wall of the front housing, a bearing interposed between the arm and the race of the hub. The method of claim 1, The arm of the hub has a concave surface whose front end corresponds to the bearing. The method of claim 2, The length of the long hole is variable capacity swash plate compressor, characterized in that formed to support the maximum, minimum inclination angle of the swash plate. The method of claim 3, wherein And the race has an inclined surface. The method of claim 3, wherein The variable displacement swash plate compressor characterized in that the bearing has a spherical surface and an equilibrium surface.

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