KR20040014118A - Variable capacity compressor of swash plate type - Google Patents

Abstract

PURPOSE: A variable displacement swash plate compressor is provided to improve productivity by simplifying structure coupling a rotary plate and a swash plate. CONSTITUTION: A compressor includes a housing unit having a cylinder block with a plurality of bores formed thereon, and forming a crank chamber, a suction chamber and a discharge chamber; a driving axis(26) installed by the housing unit; pistons installed in the bores to linearly reciprocate in the bores; a rotary body(27) placed in the crank chamber and installed to the driving axis to rotate together with the driving axis; a swash plate(28) installed to face the rotary body to reciprocate the pistons, and having a hub(29) slid along the driving axis; and a hinge unit hingedly connecting the rotary body and the swash plate, and including a first arm(31) having a guide part(31a) extended from the rotary body toward the hub and opened, a second arm(32) extended from the hub toward the first arm, and a hinge pin(33) fixed to an end of the second arm, and moved along the guide groove of the first arm. The hinge pin is fixed to the second arm as a penetrating hole(32a) is formed on the second arm, the hinge pin is coupled to the penetrating hole, and a snap ring(34) is coupled to an end of the hinge pin.

Description

Variable capacity compressor of swash plate type

The present invention relates to a variable displacement swash plate compressor, and more particularly, to a variable displacement swash plate compressor having an improved hinge coupling structure between a rotor and a swash plate installed hub.

In general, a compressor used in an automotive air conditioner pumps a 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. .

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. Since these compressors have a set capacity, the pumping capacity of the compressor can not be varied according to the cooling load when used in an automotive air conditioner driven by an engine, so the load according to the driving of the compressor is large.

In order to solve the above problems, the variable capacity swash plate type compressor capable of varying the discharge capacity of the compressor according to the cooling load of the automotive air conditioner is shown in FIGS. 1 and 2.

As shown, the variable displacement swash plate compressor includes a cylinder 12 having a plurality of bores 11, a front housing 13 in which the cylinder 12 is installed, and a crank, and the front housing. A drive shaft 16 rotatably supported by the 13 and the cylinder 12, and a rotor 17 or a lug plate mounted to the drive shaft 16 to rotate together with the drive shaft 16; And a swash plate (18). The swash plate 18 is installed to be rotatable and slideable on the drive shaft. The rotating body 17 and the swash plate 18 are connected by a hinge means 1, which is connected to the rotating body 17 by a pair of first arms 2 extending behind the compressor. And a second arm 3 extending from the boss 13b supporting the swash plate 18. Open holes 2a and 3b are formed in the first arm 2 and the second arm 3, and are coupled by the hinge pins 3a. The bore 11 of the cylinder 12 is provided with a piston 19, and the piston 19 is engaged with the swash plate 18 by hemispherical shoes 19a. Here, the slidable support of the swash plate 18 relative to the drive shaft 16 is supported by the drive shaft 16 so that the spherical sleeve 13a is slidably supported, and the sleeve 13a is slidably supported. The swash plate 18 is coupled by the boss 13b and the pin 13c supported.

Supporting the swash plate 18 on the drive shaft 16 configured as described above requires a separate spherical sleeve 13a, which causes a rise in manufacturing cost. When assembling, the sleeve 13a and the boss 13b and the pin 13c of the swash plate 18 must be coupled at the same time, so a lot of work is required and there is a problem in that productivity cannot be improved. In addition, since the first body 2 is formed on the rotating body 17 and the long holes 2a are formed thereon, a lot of work is required according to the manufacture of the first arm 2 and the second arm ( 3) Pin coupling is not easy.

On the other hand, US Patent No. 5,931,079 discloses an example of a variable displacement swash plate compressor. The disclosed compressor includes a swash plate for reciprocating a piston of the compressor, and a thrust flange which is installed to face the swash plate and fixed to a rotating shaft so as to rotate in such a manner that the swash plate and the thrust flange are coupled to each other. An inner guide groove is formed in the swash plate, and a rod coupled to the inner guide groove is fixed to the thrust flange. Such a variable displacement compressor has a problem in that it is difficult to process and install the inner guide groove and the rod and the rod coupled thereto, thereby improving productivity.

The present invention has been made to solve the above problems, and an object thereof is to provide a variable capacity swash plate type compressor capable of improving productivity due to a simple coupling structure of a combination of a rotating plate and a swash plate.

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

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

Figure 2 is an exploded perspective view showing a state in which the swash plate is coupled to the drive shaft shown in FIG.

3 is a cross-sectional view of a variable displacement swash plate compressor according to the present invention;

Figure 4 is an exploded perspective view showing a state in which the drive shaft and the rotating body and the swash plate are coupled,

5 is a perspective view showing a state in which the hub and the rotating shaft of the swash plate is coupled.

In order to achieve the above object, the variable displacement swash plate type compressor of the present invention has a housing block having a plurality of bores formed therein, a crank chamber, a suction chamber and a discharge chamber, a drive shaft rotatably installed by the housing means; And a piston installed in each bore of the cylinder so as to be capable of linear reciprocating movement, a rotating body positioned in the crank chamber and installed on the driving shaft and rotating like a driving shaft, and installed opposite to the rotating body to reciprocate the piston. And a first arm having a swash plate whose hub slides along a drive shaft, an open guide portion extending from the rotatable body to the hub side by hinge-bonding the rotating body and the swash plate, and a first extending from the hub to the first arm side. Fixed to the second arm and the end of the second arm to guide the guide groove of the first arm. And that the by comprising hinge means comprising a hinge pin which is referred to move to its features.

In the present invention, the fixing of the hinge pin to the second arm is a through-hole is formed in the first arm and the snap ring is coupled to the end in a state in which the hinge pin is coupled to the through-hole.

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

3 to 5 show an embodiment of a variable displacement swash plate compressor according to the present invention.

As shown, a cylinder 23 having a plurality of bores 22 to which the piston 21 is slidably coupled is installed, and the cylinder 23 is installed therein, and forms a crank chamber 24a and a suction and discharge chamber. The front and rear housings 24 and 25 are included. In addition, a valve assembly 60 having a drive shaft 26 rotatably supported by the front housing and the cylinder, and valves for controlling suction and discharge according to the reciprocating motion of the piston is provided at the boundary between the cylinder 23 and the rear housing. Is installed.

The drive shaft 26 is provided with a rotating body 27 located in the crank chamber and a swash plate 28 to reciprocate the piston by varying the inclination with respect to the rotating shaft, and the rotating body 27 is fixed to the driving shaft 26. And rotates together with the drive shaft 26. The rotating body 27 is coupled by the hub 29 and the hinge means 30 coupled to the swash plate 28, and the hub 29 is slidably supported when the swash plate rotates with respect to the rotation axis.

As shown in FIGS. 4 and 5, the hinge means 30 extends from the rotating body 27 toward the hub 29 and has a first arm 31 having a guide portion 31a of a predetermined length toward the swash plate. And a second arm 32 extending from the hub 29 toward the first arm 31, and fixed to an end of the second arm 32, and a guide part 31a of the first arm 31. A hinge pin 33 is slid when the swash plate 28 is rotated along. Herein, the hinge pin 33 is coupled to the second arm 32 so that a through hole 32a is formed in the second arm 32 and the diameter of the end of the hinge pin 33 is relatively small. It is formed to form a step and has a configuration in which a snap ring 34 for fixing to the multi portion thereof is fixed. The fixing of the second arm and the hinge pin forms a through hole in the end of the second arm and the hinge pin in the through hole It may be made by force indentation.

Although not shown in the figure, the hub may be hinged to be slidably rotatable to the rotating shaft. Reference numeral 70 is a pressure control means for adjusting the inclination angle of the swash plate by varying the pressure of the crank chamber using the pressure of the discharge chamber.

Referring to the operation of the variable displacement swash plate compressor according to the present invention configured as described above are as follows.

First, when the drive shaft 26 is rotated, the swash plate 28 is also rotated because the rotor 27 and the hub 29 is hinged. Accordingly, the pistons 21 supported at their ends are reciprocated in the bore 22 of the cylinder 23 with the shoes interposed on the swash plate 28. Accordingly, the refrigerant gas is sucked into the bore from the suction chamber of the rear housing 25 through the suction port of the valve unit and then compressed to the discharge chamber side through the discharge port of the valve unit 60.

If the cooling load of the air conditioning system increases in the above-described process, the pressure in the suction chamber of the compressor is increased (the pressure increases due to the increase in the amount of refrigerant introduced into the evaporator and the gas phase change of the refrigerant completely). The suction force is relatively increased. When the suction force is increased as described above, the pressure of the crank chamber 24a is lowered by blocking the compressed gas flowing into the crank chamber 24a from the discharge chamber by the pressure adjusting means.

In this way, the compression reaction acting by the swash plate 28 is small with respect to the suction force acting on the piston 21 when the piston 21 moves from the top dead center to the bottom dead center due to the decrease in the pressure of the crank chamber 24a. When the piston 21 moves from the bottom dead center to the top dead center, the suction reaction force against the compressive force acting on the piston 21 by the swash plate becomes relatively large, so that the inclination angle of the swash plate 28 is increased.

In the process of increasing the inclination angle of the swash plate 28, the hub 29 supported by the swash plate 28 is hinged by the hinge means 30, so that the swash plate 28 is rotated. That is, the first arm 31 installed on the rotating body 27 is hinged by a hinge shaft 33 protruding to one side of the first arm 31 extending from the hub 29 supporting the swash plate 28. It does not interfere with the swash plate rotation.

As described above, the variable displacement swash plate compressor of the present invention is simple in structure because it is connected by a hinge means composed of first and second arms and hinge pins to support the hub supporting the swash plate to the drive shaft. Since the pin supported on the second arm is supported by the snap ring, the occurrence of a defective rate due to the engagement of the second arm and the pin can be reduced.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary and will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. .

Claims (3)

A housing means having a cylinder block having a plurality of bores formed therein to form a crank chamber, a suction chamber, and a discharge chamber, a drive shaft rotatably installed by the housing means, and a piston installed in a linear reciprocating motion in each bore of the cylinder. And a rotating body positioned in the crank chamber and installed on the driving shaft and rotating together with the driving shaft, and a swash plate installed opposite to the rotating body to reciprocate the piston and sliding of the hub along the driving shaft, and the rotating body. And a first arm having an open guide portion extending from the rotatable body to the hub side by hinge-bonding the swash plate, a second arm extending from the hub to the first arm side, and fixed to an end of the second arm. 1 is provided with a hinge means including a hinge pin to be moved along the guide groove of the arm A variable displacement swash plate type compressor as set. The method of claim 1, The fixing of the hinge pin to the second arm is a variable displacement swash plate type compressor characterized in that the through-hole is formed in the first arm and the snap ring is coupled to the end in a state in which the hinge pin is coupled to the through-hole. The method of claim 1, The fixing of the second arm and the hinge pin is a variable displacement swash plate type compressor characterized in that the through-hole is formed in the end of the second arm and the hinge pin is forcibly pressed into the through-hole.