KR20020039142A - Structure for hinge connecting rotor and swash plate of a variable displacement swash plate type compressor - Google Patents

Abstract

PURPOSE: A structure of hinge of swash plate of variable capacity type swash plate compressor is provided to prevent separation of a hinge pin during operation of a compressor. CONSTITUTION: A stepped protrusion is formed on a hinge pin hole of a second hinge arm(22) by forming a second hole on one of ends of the hinge pin hole with diameter larger than the hinge pine hole. A protrusion is annular and formed on a hinge pin(23) corresponding with the stepped protrusion of the second hinge arm to have diameter and depth corresponding with the second hole of the hinge pin hole. A front end of the protrusion of the hinge pin is fixed by the stepped protrusion of the second hinge arm and a rear end of the protrusion of the hinge pin is fixed by a first hinge arm(21) to restrain the hinge pin from moving in the hinge pin hole.

Description

STRUCTURE FOR HINGE CONNECTING ROTOR AND SWASH PLATE OF A VARIABLE DISPLACEMENT SWASH PLATE TYPE COMPRESSOR}

The present invention relates to a variable displacement swash plate type compressor for varying the discharge capacity by adjusting the inclination angle of the swash plate. More specifically, the inclination angle of the swash plate is controlled by a swash plate which is inclined to the rotor and the drive shaft rotating together with the drive shaft. It relates to a swash plate hinge structure that is connected to the hinge pin if possible.

In the swash plate type compressor, which is widely used as a compressor of an automobile air conditioner, a disk-shaped swash plate installed to be inclined to a rotating drive shaft by receiving engine power rotates by a drive shaft, and the shoe is driven along the circumference of the swash plate by rotation of the swash plate. The plurality of pistons installed therebetween are linearly reciprocated in the plurality of cylinder bores formed in the cylinder block, thereby inducing / compressing and discharging the refrigerant gas.

The variable displacement swash plate compressor is configured such that the inclination angle of the swash plate installed on the drive shaft is variable according to the heat load, and thus the amount of refrigerant discharge is adjusted while the reciprocating feed amount of the piston is changed.

The variable displacement swash plate type compressor as shown in FIG. 1 has a cylinder block (1) having a plurality of cylinder bores (1a) arranged in parallel in the longitudinal direction on the inner circumferential surface of the cylinder block (1), and The front housing 2 is hermetically coupled to the front, and the rear housing 3 is hermetically coupled to the rear of the cylinder block 1 under the valve plate 3a.

In the crank chamber 4 defined by the front housing 2, a drive shaft 5 is rotatably installed at the center of the front housing 2, and the drive shaft 5 is provided with a rotor 6 and a swash plate 7. ) Is installed. The rotor 6 is rotated together with the drive shaft 5, and the swash plate 7 is connected to the rotor 6 by a hinge structure 8, while one end thereof is inclined at an angle to the drive shaft 5. In addition, the inclination angle is varied while rotating together with the rotor 6 and slidingly moving along the drive shaft 5 in the axial direction.

On the outer circumference of the swash plate 7, a plurality of pistons 9 reciprocating in each cylinder bore 1a of the cylinder block 1 in accordance with the rotation of the swash plate 7 are fixed under the opening of the shoe 10. Installed at intervals.

In the rear housing 3, the suction chamber 11 and the discharge chamber 12 are formed, respectively, and the valve plate 3a is formed with the suction port 13 and the discharge port 14, respectively.

In addition, the valve plate 3a is provided with a suction lead 15 and a discharge lead 16 which open and close the inlet 13 and the outlet 14 while operating by a pressure change caused by the reciprocating movement of the piston 9. It is.

On the other hand, the spring 17 interposed in the drive shaft 5 between the rotor 6 and the swash plate 7 allows the swash plate 7 to return to its initial position by elastically supporting the swash plate 7 with respect to the rotor 6. The control valve 18 operatively communicates the discharge chamber 12 and the crank chamber 4 to vary the differential pressure between the refrigerant suction pressure in the cylinder bore 1a and the gas pressure in the crank chamber 4. It serves to adjust the inclination angle of the swash plate (7).

In such a variable displacement swash plate type compressor, the piston 9 slidably mounted to the swash plate 7 by the swash plate 7 which swings in the front and rear direction while rotating together with the rotation of the drive shaft 5 is reciprocated. As a result, the refrigerant is compressed, and the inclination angle of the swash plate 7 is adjusted in response to the pressure difference between the pressure in the crank chamber 4 and the suction pressure in the cylinder bore 1a, thereby varying the compressor discharge capacity.

Here, the hinge part (hinge structure 8) which is the connection part of the swash plate 7 and the rotor 6 becomes a reference | standard support point of the swash plate 7 inclination-angle adjustment. The swash plate hinge structure includes hinge pin holes provided in the hinge pin holes provided in the pair of hinge arms 21 formed at predetermined intervals on the rotor 6 and hinge arms 22 of the swash plate 7 as the hinge pins 23. It consists of a structure that is fitted by connecting. At this time, the hinge pin hole provided in the hinge arm 21 of the rotor 6 has a long hole shape with one side open, and the hinge pin 23 is provided in the hinge pin hole provided in the hinge arm 22 of the swash plate 7. It is forcibly pressed in to prevent removal during operation. Both protruding portions of the hinge pins 23 forcibly pushed into the hinge pin holes provided on the hinge arms 22 of the swash plate 7 have the hinge pin holes in the hinge pin holes of the long hole type provided in the hinge arms 21 of the rotor 6. It is accommodating to move along. Accordingly, the inclination angle of the swash plate 7 is adjusted by using the hinge pin 23 as a reference point. At the maximum inclination angle of the swash plate, the hinge pin 23 is positioned at the top of the hinge pin hole formed in the hinge arm of the rotor 6. In the minimum inclination angle of the swash plate, the hinge pin 23 is positioned at the lowermost portion of the hinge pin hole.

However, in the swash plate hinge structure of the conventional variable displacement swash plate type compressor as described above, in order to prevent the removal of the hinge pin 23 when the compressor is operating, the hinge pin 23 is forcibly pressed into the hinge pin hole provided in the hinge arm of the swash plate. Although the structure is selected, a phenomenon in which the hinge pin is removed from the hinge pin hole is often caused by the rapid acceleration, deceleration, or clutch cycling when the compressor is used for a long time.

In addition, since the conventional swash plate hinge structure is a forced press-fitting method as described above, it is difficult to assemble the hinge pin, and in order to maintain the pressing force between the hinge pin and the hinge pin hole, the machining tolerance must be very low, and thus in terms of productivity. There is also a problem that is very disadvantageous.

The present invention has been made in view of the above-mentioned problems, and the swash plate hinge of the variable displacement swash plate type compressor can prevent the various problems caused by removing the hinge pin during operation of the compressor because the hinge pin is easy to assemble and is not easily removed. The purpose is to provide a structure.

Another object of the present invention is to provide a swash plate hinge structure of a variable displacement swash plate type compressor that can greatly increase the machining tolerances of the hinge pin and the hinge pin hole, thereby improving productivity.

1 is a cross-sectional view showing an example of a variable displacement swash plate compressor used in an automotive air conditioner,

Figure 2 is a perspective view showing a swash plate hinge structure and thereby the rotor and the swash plate connected according to the present invention,

Figure 3 is a partially cut perspective view showing a hinge pin coupling state of the swash plate hinge structure according to the present invention,

4A, 4B, and 4C are detailed cross-sectional views illustrating a coupling relationship between a hinge pin and a hinge pin hole, which are main parts of the present invention;

Figure 5 is a side view of Figure 2 shown to explain the hinge pin departure prevention action in the swash plate hinge structure according to the present invention.

* Description of the symbols for the main parts of the drawings *

5; drive shaft 6; rotor

7; Saphan 21; first hinge arm

22; second hinge arms 21a and 22a; hinge pin holes

22b; step 23; hinge pin

23b; protrusion

In the swash plate hinge structure of the variable displacement swash plate type compressor according to the present invention for achieving the above object, a pair of first hinge arm provided on the rotor and the second hinge arm provided on the swash plate are formed on these hinge arms, respectively. The hinge pin is inserted into and installed in the hinge pin hole so that the inclination angle of the swash plate can be adjusted. A stepped portion is formed in the hinge pin hole of the second hinge arm, and a protrusion corresponding to the stepped portion is formed in the hinge pin. The hinge pin is limited in the hinge pin hole of the second hinge arm by its protruding front end to be caught in the stepped portion, and the movement of the hinge pin in the hinge pin insertion direction is restricted. Limited.

According to this, since the hinge pin inserted into the hinge pin hole is restrained from moving in the hinge pin hole by the stepped portion of the hinge pin hole and the first hinge arm, it is possible to fundamentally prevent the removal of the hinge pin. In addition, according to the present invention, since the hinge pin does not need to be press-fitted into the hinge pin hole, the machining tolerances of the hinge pin and the hinge pin hole can be large. Therefore, the productivity and assembly property improvement effect can be anticipated.

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

Figure 2 is a perspective view showing a swash plate hinge structure and thereby the rotor and the swash plate connected state according to the present invention, Figure 3 is a partially cut perspective view showing a hinge pin coupling state of the swash plate hinge structure according to the present invention, Figures 4a, 4b and 4c 2 is a detailed cross-sectional view illustrating the coupling relationship between a hinge pin and a hinge pin hole, which is an essential part of the present invention, and FIG. 5 is a side view of FIG. . For reference, in describing the embodiments of the present invention, the same reference numerals refer to the same parts as those in the related art.

As shown in Figures 2 and 3, the swash plate hinge structure of the variable displacement swash plate type compressor according to the present invention, the lower side is open to the rotor 6 coupled to the drive shaft 5 and rotates together with the drive shaft (5). The pair of first pairs are provided on the swash plate 7, which is provided with a pair of first hinge arms 21 having a hinge pin hole 21a having a long hole shape, and is movably mounted to the drive shaft 5 in an axial direction thereof. A second hinge arm 22 having a circular hinge pin hole 22a disposed between the hinge arms 21 is provided, and the first and second hinge arms 21 and 22 are hinge pin holes respectively formed therein. It is connected to each other by a hinge pin 23 is inserted into, and installed in (21a) (22a).

The hinge pin 23 is inserted into the hinge pin hole 22a of the second hinge arm 22 so that both ends protrude from both sides of the hole 22a, and both protrusions of the hinge pin 23 are formed as described above. The long hinge-shaped hinge pin holes 21a respectively formed in the pair of first hinge arms 21 are accommodated to move along the hinge pin holes 21a. Therefore, it is possible to adjust the inclination angle of the swash plate 7 with the hinge pin 23 as a reference point.

Meanwhile, according to the present invention, as shown in FIG. 4A, the stepped portion 22b is formed in the hinge pin hole 22a of the second hinge arm 22, and the hinge pin 23 is illustrated in FIG. 4B. As shown, a protrusion 23b corresponding to the stepped portion 22b is formed. Accordingly, as shown in FIG. 4C, the hinge pin 23 fitted into the hinge pin hole 22a has its protruding front end caught by the stepped portion 22b of the hinge pin hole 22a in the forward direction (left direction in the drawing). Movement is restricted, and the protruding rear end thereof is blocked by the first hinge arm 21 so that movement in the opposite direction (right in the drawing) is restricted. That is, in a state where the first and second hinge arms 21 and 22 are connected by hinge pins 23 inserted into their hinge pin holes 21a and 22a, the hinge pins 23 are formed by their protrusions ( 23b) Both ends are restrained from moving in the hinge pin hole 22a by engaging the stepped portion 22b of the hinge pin hole 22a and the first hinge arm 21. Therefore, the hinge pin is not removed from the hinge pin hole even if the hinge pin is not forcedly pushed into the hinge pin hole as in the related art.

Here, the stepped portion 22b may be formed by processing a second hole in the hinge pin hole 22a that is slightly larger in diameter than the hole from one end to a predetermined depth, and the protrusion 23b of the hinge pin 23. ) Is formed as an annular protrusion having a size corresponding to the diameter and depth of the second hole, but is not necessarily limited thereto, and other forms of stepped portions or protrusions may be formed. For example, although not specifically illustrated, the stepped portion may be formed by forming several slots in the hinge pin hole. In this case, a rib corresponding to the slot will be formed in the hinge pin. In addition to the above examples, any shape of the stepped portion that can limit the movement of the hinge pin in the hinge pin hole in the insertion direction and the protrusion of any shape of the hinge pin that can limit the movement in the opposite direction by the hinge arm It will be apparent to be included in the scope of the present invention.

5 shows an example of limiting the movement of the hinge pin 23, for example, the movement in the forward direction, by contacting the side of the first hinge arm 21 with the protruding rear end of the hinge pin 23. . That is, since the end diameter of the hinge pin hole 21a formed in this first hinge arm 21 is smaller than the diameter of the protrusion 23b of the hinge pin 23, the periphery of the hinge pin hole 21a is the protrusion 23b. ), The hinge pin 23 does not move in that direction and is constrained.

In the swash plate hinge structure according to the present invention, the hinge pins 23 are formed in the circular hinge pin holes 22a formed in the second hinge arm 22 of the swash plate 7, and both ends thereof are outward of the hinge pin holes 22a. Insert it to protrude. Then, the hinge pin is coupled while the front end of the protrusion 23b of the hinge pin 23 is caught by the stepped portion 22b in the hinge pin hole 22a. At this time, the rear end of the protrusion 23b of the hinge pin 23 is located on the same plane as the side surface of the second hinge arm 22. In this state, both protruding end portions of the hinge pin 23 are connected to each other by being inserted into the hinge pin hole 21a of the first hinge arm 21. Then, the side of one side of the first hinge arm 21 is in contact with the side of the second hinge arm 22, the diameter of the protrusion 23b of the hinge pin 23 and the hinge pin hole (1) of the first hinge arm 21 By the relationship with the diameter of 21a), the first hinge arm 21 is assembled while blocking the lower end of the protrusion 23b of the hinge pin 23.

Accordingly, the hinge pin 23 has two members, for example, the first end of the protrusion 23b, at the stepped portion 22b in the hinge pin hole 22a, and the rear end at the first hinge arm 21. Since the hinge pins 21 and the hinge pin holes 21a and 22a of the second hinge arm 22 are installed through the hinge arm 21 and the second hinge arm 22, the hinge pins 23 are not removed.

In addition, since the hinge pin is separated from the structure as described above, it is not necessary to press the hinge pin into the hinge pin hole and may have a large tolerance.

According to the present invention as described above, since the hinge pin inserted into the hinge pin hole is constrained so as not to move in the hinge pin hole by the stepped portion of the hinge pin hole and the first hinge arm, the phenomenon of removing the hinge pin is fundamentally prevented. can do.

In addition, according to the present invention, since the hinge pin does not need to be press-fitted into the hinge pin hole, the machining tolerances of the hinge pin and the hinge pin hole can be large. Therefore, the productivity and assembly property improvement effect can be anticipated.

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. Of course, anyone skilled in the art can make various modifications, as well as such modifications are within the scope of the claims.

Claims (2)

A variable capacity type in which a pair of first hinge arms provided in the rotor and a second hinge arm provided in the swash plate are connected to each other so as to allow the inclination angle of the swash plate to be adjusted by hinge pins inserted and installed in the hinge pin holes respectively formed in the hinge arms. In the swash plate hinge structure of the swash plate compressor, A stepped portion is formed in the hinge pin hole of the second hinge arm, and a protruding portion corresponding to the stepped portion is formed in the hinge pin. The protruding front end portion of the hinge pin is caught by the stepped portion, and the protruding rear end portion is formed in the first hinge arm. A swash plate hinge structure of a variable displacement swash plate type compressor, characterized in that the hinge pin is restrained from moving in the hinge pin hole by being caught. The method of claim 1, The stepped portion is formed by processing a second hole having a diameter larger than this hole in the hinge pin hole from one side end to a predetermined depth, and the protrusion is formed of an annular protrusion having a size corresponding to the diameter and depth of the second hole. Swash plate hinge structure of a variable displacement swash plate type compressor characterized in that.