KR20080026733A - Variable capacity compressor - Google Patents

Abstract

A variable capacity compressor is provided to install a guide support having an opened upper portion so that the interference and the contact between a hinge arm and a support arm are reduced. A pair of support arms(71a) is provided at one of a rotor(60) and a swash plate(70). A single hinge arm(61) is provided at the other. The support arms are spaced apart from each other by a predetermined distance, and are formed with a hole into which a pin is inserted. The hinge arm is interposed between the support arms. The hinge arm includes a guide support(62) having an opened upper portion. The width of the guide support is narrower than the width of the hinge arm. The upper portion of the guide support is formed with a side surface step such that the guide support is not in contact with the support arm.

Description

Variable Capacity Compressor

1 is a cross-sectional view showing a variable displacement compressor according to the prior art.

Figure 2 is an exploded perspective view showing a swash plate driving apparatus according to the prior art.

3 is an exploded perspective view showing a swash plate driving apparatus according to an embodiment of the present invention.

Figure 4 is an exploded perspective view showing a swash plate driving apparatus according to another embodiment of the present invention.

5 is a cross-sectional view showing a coupled state of the swash plate driving apparatus according to FIG.

*** Explanation of symbols for the main parts of the drawing ***

21: crankcase, 50: drive shaft,

60: rotor, 61: hinge arm,

62: guide support, 62a: side step,

70: Saphan, 71: Saphan Hub,

71a: support arm, 72: swash plate,

73: hinge pin.

The present invention relates to a variable displacement compressor, and more particularly, by adopting a guide support having an open upper portion so as not to contact the support arm, the swash plate according to the change of the inclination angle of the swash plate operating in the axial direction when the drive shaft rotates. At the same time, the shear force due to the operating force transmitted from the hub is reduced to the guide support, and at the same time, mutual interference and contact between the support arm and the hinge arm can be reduced to prevent breakage of the hinge arm, thereby improving durability inside the compressor. To a variable displacement compressor.

In general, a compressor used in an automobile air conditioner has a function of sucking the vaporized heat exchange medium in the evaporator, compressing the sucked heat exchange medium, and pumping the compressed heat exchange medium to continuously circulate the refrigerant. To make it possible.

There are various kinds of such compressors, such as a swash plate type compressor in which a piston reciprocates by the rotation of an inclined swash plate, a scroll type compressor compressed by two scroll rotary motions, and a rotary type compressor compressed by a rotary vane. Among these, the reciprocating compressor that compresses the refrigerant according to the reciprocating motion of the piston includes crank and wobble plate type, in addition to the swash plate compressor. Type compressors and the like.

In the variable displacement compressor according to the related art, as illustrated in FIGS. 1 and 2, a plurality of cylinder bores 111 are formed in a longitudinal direction along a concentric circle, and a center bore 112 is formed at the center thereof. Block 110; A front housing 120 installed at the front of the cylinder block 110 to form a crank chamber 121 therein; A rear housing 130 installed at the rear of the cylinder block 110 to form a refrigerant suction chamber 131 and a refrigerant discharge chamber 132 therein; A plurality of pistons (140) inserted into the cylinder bores (111) of the cylinder block (110) so as to be reciprocated and having a bridge portion (141) formed at one side thereof; A hollow drive shaft 150 inserted into a center of the front housing 120 and the cylinder block 110 and rotatably supported to form a flow path 151 therein; A rotor 160 disposed around the drive shaft 150 in the front of the crank chamber 121 and rotated by the rotation of the drive shaft 150, and having a hinge arm 161 protruding from one upper surface thereof; The crank chamber 121 is accommodated in the crank chamber 121 and installed along the center circumference of the driving shaft 150 to be inclined and coupled to the swash plate hub 171 having the support arm 171 a and the swash plate hub 171. A swash plate 170 including a swash plate 172 inserted into an insertion space of the bridge portion 141; Interposed between the cylinder block 110 and the rear housing 130, the refrigerant is sucked from the refrigerant suction chamber 131 to the cylinder bore 111, and the refrigerant is discharged from the cylinder bore 111 to the refrigerant discharge chamber 132. A valve unit 180 for performing; By operatively communicating the refrigerant discharge chamber 132 and the crank chamber 121, the differential pressure between the refrigerant suction pressure in the cylinder bore 111 and the gas pressure in the crank chamber 121 is varied to adjust the inclination angle of the swash plate 170. It consists of a control valve 190 and the like installed in the rear housing 130 to.

The cylinder block 110 is provided with a center bore 112 formed in the center and a plurality of cylinder bores 111 formed so as to be radially equidistantly spaced around the center bore 112, and the piston ( 140 is slidably disposed in each cylinder bore 111 and is formed to have a body 142 and a bridge portion 141.

The front housing 120 and the rear housing 130 are disposed at the front and rear ends of the cylinder block 110, respectively, and are coupled to each other by a long bolt 122.

The drive shaft 150 penetrates through the center of the front housing 120 so as to be rotatable, and supports the rear end portion in the center of the cylinder block 110 so as to be rotatable through a crank chamber 121 formed inside the front housing 120. It is installed as possible.

In addition, the valve unit 180 is installed between the cylinder block 110 and the rear housing 130 to control the suction and discharge of the refrigerant. The valve unit 180 includes a valve plate 181 interposed between the cylinder block 110 and the rear housing 130, and a suction reed valve 182 interposed between the valve plate 181 and the cylinder block 110. ) And a discharge reed valve 183 interposed between the valve plate 181 and the rear housing 130. Between the discharge reed valve 183 and the rear housing 130, a valve retainer 184 having an outer end bent backward to limit the operation area of the operation of the operation of the discharge reed valve 183 and to prevent damage to the operation part. The valve retainer 184 has a central portion coupled to the valve unit 180 by a rivet 185 or a coupling bolt.

On the other hand, the inner space formed by the cylinder block 110 and the front housing 120 is used as the crank chamber 121 as a space in the airtight state, the rotor around the drive shaft 150 inside the crank chamber 121 The swash plate driving device including the 160 and the swash plate 170 is installed.

The rotor 160 has a hinge arm 161 having a guide groove 161a protruding from the upper side of the rotor 160 so as to be hinged. The hinge arm 161 is bent and extended upwardly along the guide groove 161a of the hinge arm 161 so that the hinge pin 173 is not separated.

In addition, the swash plate 170 is a swash plate hub 171 is formed with a pair of support arms (171a) spaced at predetermined intervals protruded on the upper side, and the swash plate plate 172 is installed around the swash plate hub 171 It includes.

The support arm 171a of the swash plate hub 171 has a hinge arm 161 of the rotor 160 inserted therebetween, a hole formed in the support arm 171a and a guide groove 161a of the hinge arm 161. Through the hinge pin 173 is connected to the hinge is coupled. In addition, a portion of the outer circumference of the swash plate 172 is rotatably inserted into the bridge portion 141 of the piston 140.

The swash plate 170 rotates together with the rotor 160 rotated by the drive shaft 150 and can be tilted by rotating back and forth around the hinge pin 173 according to the pressure inside the crank chamber 121. Done.

In the conventional variable displacement compressor configured as described above, the refrigerant is compressed by reciprocating the piston 140 by the swash plate 170 which is inclined forward and backward while rotating together with the rotation of the drive shaft 150. The inclination angle of the swash plate 170 is adjusted in response to the pressure difference between the pressure in the crank chamber 121 and the refrigerant suction pressure in the cylinder bore 111, thereby varying the compressor discharge capacity.

However, when the operating inclination angle of the swash plate changes when the drive shaft rotates, the hinge arm 161 does not withstand the shear force against the operating force transmitted from the swash plate hub 171, and the support arm 171a and the hinge arm 161 are There is a problem that the durability of the compressor is degraded due to damage during operation as the interference and contact of the increase.

The present invention has been made to solve the above problems, by employing a guide support having an upper portion open so as not to contact the support arm, from the swash plate hub according to the change of the inclination angle of the swash plate operating in the axial direction when the drive shaft is rotated In addition to reducing the shear force transmitted by the operating force to the guide support, while reducing the mutual interference and contact between the support arm and the hinge arm to prevent the breakage of the hinge arm to improve the durability inside the compressor. Its purpose is.

Another object of the present invention is to form a narrower width of the guide support than the hinge arm, thereby reducing the shear force transmitted to the hinge arm to prevent breakage of the support arm.

According to the variable displacement compressor according to the present invention devised to achieve the above object, a cylinder block having a plurality of cylinder bores; Front and rear housings in which the crank chamber, the suction chamber, and the discharge chamber are formed; Pressure adjusting means for adjusting the pressure of the crank chamber; A drive shaft rotatably supported by the front and rear housings and the cylinder block; A plurality of pistons inserted into each of the cylinder bores and reciprocating; A rotor mounted to the drive shaft and rotatably fixed to the drive shaft to rotate together with the drive shaft in the crank chamber; In a variable displacement swash plate type compressor having a swash plate operatively connected to the rotor and slidably mounted to the drive shaft, the inclination angle of which is changed by the pressure adjusting means, wherein either one of the rotor or the swash plate is provided. A pair of supporting arms spaced at intervals and formed with pinholes into which hinge pins are inserted is provided, and on the other side, a single hinge arm is interposed between the pair of supporting arms, and the hinge arm has an open upper portion. It further comprises a guide support.

The width of the guide support is narrower than that of the hinge arm.

In addition, the upper portion of the guide support, characterized in that the side step portion is formed so as not to contact the support arm.

In addition, the guide support, characterized in that to form a substantially 'U' shaped pin guide surface.

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

3 is an exploded perspective view showing a swash plate driving apparatus according to an embodiment of the present invention, Figure 4 is an exploded perspective view showing a swash plate driving apparatus according to another embodiment of the present invention, Figure 5 is a swash plate driving apparatus according to FIG. Cross-sectional view showing the combined state of.

A variable displacement compressor according to the present invention includes a cylinder block having a plurality of cylinder bores; Front and rear housings in which the crank chamber, the suction chamber, and the discharge chamber are formed; Pressure adjusting means for adjusting the pressure of the crank chamber; A drive shaft 50 rotatably supported by the front and rear housings and the cylinder block; A plurality of pistons inserted into each of the cylinder bores and reciprocating; A rotor (60) mounted to the drive shaft (50) and rotatably fixed to the drive shaft to rotate together with the drive shaft (50) in the crank chamber; Since the variable displacement swash plate compressor, etc. having a swash plate 70 operably connected to the rotor 60 and slidably mounted to the drive shaft and having an inclination angle changed by the pressure adjusting means is the same as in the prior art, Hereinafter, a detailed description of the above configuration will be omitted.

In the variable displacement compressor according to the present invention, as shown in FIGS. 3 to 5, either one of the rotor 60 or the swash plate 70 is spaced at a predetermined interval and a hinge pin 73 is inserted. A pair of support arms 71a having a pinhole are provided, a single hinge arm 61 interposed between the pair of support arms 71a is provided on the other side, and an upper portion of the hinge arm 61 is provided. An open guide support 62 is further provided.

The rotor 60 is installed around the drive shaft 50 in the front of the crank chamber and rotates according to the rotation of the drive shaft 50, and the hinge arm 61 protrudes from one side of the upper portion of the rotor 60. .

The hinge arm 61 is provided with a guide support 62 to enable hinge coupling through a hinge pin 73. The guide support 62 is formed to be bent and the upper portion is opened, thereby forming a pin guide surface of approximately 'U' shape.

Here, a side step portion 62a is formed at the upper portion of the guide support 62 provided in the hinge arm 61 so as not to contact the support arm 71a. That is, the guide support 62 is interposed between the support arms 71a, and the hinge pin 73 is connected between the support arm 71a and the guide support 62 and hinged to the swash plate 70. In operation, the upper portion of the guide support 62 is opened so as not to contact the inner surface of the support arm 71a so that the support arm 71a and the guide support 61 do not contact or interfere with each other. .

In addition, it is preferable that the width W1 of the guide support is formed to be narrower than the width W2 of the hinge arm.

By forming the upper portion of the guide support 62 as described above, the shear force due to the operating force transmitted from the swash plate 71 when the operating inclination angle of the swash plate 70 to be driven when the drive shaft 50 rotates, the guide is guided. In addition to reducing the transmission to the support portion 62, the interference and contact between the support arm 71a and the hinge arm 61 can be reduced, thereby preventing the hinge arm 61 from being broken during swash plate driving.

In addition, by forming the side step portion 62a on the upper portion of the guide support 62, interference and contact with the support arm 71a can be reduced, thereby facilitating the change of the inclination angle of the guide support 62, It is possible to prevent breakage.

In addition, since the guide support 62 forms a pin guide surface having a substantially U 'shape, the swash plate inclination angle change can be easily guided.

Meanwhile, the swash plate 70 includes a swash plate hub 71 and a swash plate plate 72.

The swash plate hub 71 has a pair of support arms 71a spaced apart at predetermined intervals from one side thereof to protrude. The guide support 62 of the hinge arm 61 is interposed between the support arms 71a formed as described above, and the hinge pin 73 is connected through the hole formed in the support arm 71a and the guide support 62. Hinge coupling is possible.

Although the preferred embodiments of the present invention have been described above, the scope of the present invention is not limited to such specific embodiments, and those skilled in the art may appropriately change within the scope described in the claims of the present invention. This will be possible.

As described above, according to the variable displacement compressor according to the present invention, the drive shaft is formed by employing a guide support having an upper portion opened so as not to contact the support arm, and employing a guide support with an upper portion opened so as not to contact the support arm. As the rotational angle of the swash plate operating in the axial direction changes, the shear force caused by the operating force transmitted from the swash plate hub is transmitted to the guide support, and the mutual interference and contact between the support arm and the hinge arm can be reduced. It is effective to prevent the breakage of the hinge arm and improve the durability of the compressor.

In addition, the width of the guide supporting portion is formed to be narrower than the hinge arm, thereby reducing the shear force transmitted to the hinge arm to prevent the breakage of the support arm.

Claims (4)

A cylinder block in which a plurality of cylinder bores are formed; Front and rear housings in which the crank chamber, the suction chamber, and the discharge chamber are formed; Pressure adjusting means for adjusting the pressure of the crank chamber; A drive shaft 50 rotatably supported by the front and rear housings and the cylinder block; A plurality of pistons inserted into each of the cylinder bores and reciprocating; A rotor (60) mounted to the drive shaft (50) and rotatably fixed to the drive shaft to rotate together with the drive shaft (50) in the crank chamber; In the variable displacement swash plate type compressor having a swash plate 70 operatively connected to the rotor 60 and slidably mounted to the drive shaft, the inclination angle is changed by the pressure adjusting means, One side of the rotor 60 or the swash plate 70 is provided with a pair of support arms 71a having pinholes spaced at predetermined intervals and into which the hinge pins 73 are inserted, and on the other side, the pair A single hinge arm 61 is provided between the support arms 71a of the variable arm type, and the hinge arm 61 further includes a guide support 62 having an open upper portion. compressor. The method of claim 1, The width W1 of the guide support is narrower than the width W2 of the hinge arm. The method of claim 1, The upper portion of the guide support portion 62, the variable displacement swash plate type compressor, characterized in that the side step portion (62a) is formed so as not to contact the support arm (71a). The method of claim 1, The guide support portion 62, the variable displacement swash plate type compressor, characterized in that to form a substantially 'U' shaped pin guide surface.

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