KR20090087925A - Mechanism spring and swash plate type compressor employing the same - Google Patents

Abstract

A mechanism spring and a swash plate type compressor having the same are provided to buff the sudden change of the slope plate tilt angle easily in the operation of an air conditioner and improve the initiating operation of the compressor which operates at minimum tilt angle in the operation of the air conditioner. A mechanism spring being inserted into a driving shaft of the swash plate type compressor comprises a flat part(161), a curved supporting part(162) and a curved connection part(163). At one side of the flat part, a groove(161a) is inserted into the driving shaft. On the both sides of the groove, two extended plates(161b) are formed. The curved supporting part is composed of two supporting plates(162a) which are arranged to be faced in two extended plates. The curved supporting part is convexly bent toward the flat part. The curved connection part is composed of two connection plates(163a) connecting one end of two extended plates and one end of two supporting plates.

Description

Mechanism spring of swash plate type compressor and its swash plate type compressor {MECHANISM SPRING AND SWASH PLATE TYPE COMPRESSOR EMPLOYING THE SAME}

The present invention relates to a mechanism spring of a swash plate type compressor and a swash plate type compressor thereof. In particular, the present invention improves the initial operability (initial compression process) of a compressor driven at a minimum inclination angle (0 degrees) when the air conditioner is turned on. At the same time, the present invention relates to a mechanism spring and a swash plate compressor of a swash plate type compressor having a function of buffering the fluctuation of the swash plate inclination angle in the compression process to an abrupt minimum inclination angle (0 degree) when the air conditioner is turned off.

As is well known, in the general swash plate type compressor, which is widely used as a compressor of a vehicle air conditioner, a disc-shaped swash plate is installed on a drive shaft to which engine power is transmitted so that the inclination angle is variable, and a shoe (shoe) is formed around the swash plate. A plurality of pistons are freely installed through the through. The piston sucks, compresses and discharges the refrigerant gas by linearly reciprocating the inside of the plurality of cylinder bores formed in the cylinder block.

Recently, the inclination angle of the swash plate is changed according to the change of the heat load to control the feed amount of the piston to achieve precise motion control, and to reduce the sudden torque fluctuation of the engine by the compressor, thereby improving the riding comfort of the vehicle. Many swash plate compressors have been proposed.

1 shows a variable displacement swash plate type compressor disclosed in Korean Patent Application No. 1996-0021953, which is briefly described as follows.

The conventional variable displacement swash plate compressor 10, the cylinder block 11 having a plurality of cylinder bores (11a) formed in parallel in the longitudinal direction on the inner peripheral surface, and is hermetically coupled to the front of the cylinder block (11) The front housing 12 and the rear housing 13 is hermetically coupled to the rear of the cylinder block 11 via a valve plate 13a.

In addition, a swash plate chamber 14 is formed inside the front housing 12, and one end of the driving shaft 15 is rotatably supported at the center of the front housing 12, while the other end of the driving shaft 15 is rotatably supported. Is passed through the swash plate chamber 14 is supported via the bearing (11c) to the central shaft hole (11b) of the cylinder block (11).

In addition, the drive shaft 15 is provided with a lug plate 16, which is spaced apart by a predetermined distance, and a swash plate 17 provided through the drive shaft 15 so that the inclination angle is variable, and the lug plate 16 is provided. The spring 27 for elastically supporting the swash plate 17 with respect to the lug plate 16 is interposed between the swash plate 17 and the swash plate 17. The minimum inclination angle of the swash plate 17 can be maintained by the spring 27.

If the swash plate 17 does not maintain the minimum inclination angle for compressing the refrigerant, even if the drive shaft 15 rotates at the beginning of the operation of the compressor, since the refrigerant is not compressed at all, the initial operation of the compressor becomes unstable and takes a lot of initial load. .

In the lug plate 16, a pair of power transmission protrusions 16a, each of which has a hinge hole 16b linearly perforated, is formed to protrude integrally at one end of the surface to rotate together with the drive shaft 15.

In addition, the swash plate 17 has a hinge pin 18 fixed to one surface of the swash plate 17 formed to be inclined at a predetermined angle to the driving shaft 15 and formed on the power transmission protrusion 16a of the lug plate 16. It is inserted into 16b, and it rotates with the lug plate 16, and the inclination angle is changed.

In addition, the outer circumferential surface of the swash plate 17 is slidably fitted to the piston 19 provided in each cylinder bore 11a via the shoe 20.

Accordingly, as the swash plate 17 rotates in an inclined state, the pistons 19 inserted through the shoe 20 on the outer circumferential surface thereof reciprocate in each cylinder bore 11a of the cylinder block 11. .

In addition, a suction chamber 21 and a discharge chamber 22 are respectively formed in the rear housing 13, and each cylinder bore is provided in the valve plate 13a interposed between the rear housing 13 and the cylinder block 11. The suction port 23 and the discharge port 24 are respectively formed in the position corresponding to 11a.

Suction valves for opening and closing the inlet port 23 and the outlet port 24 in each of the inlet port 23 and the outlet port 24 formed in the valve plate 13a by the pressure change according to the reciprocating motion of the piston 19. 25 and a discharge valve 26 are provided.

In addition, the rear housing 13 has suction with the swash plate chamber 14 so as to adjust the inclination angle of the swash plate 17 by varying the pressure difference between the refrigerant suction pressure in the cylinder bore 11a and the pressure in the swash plate chamber 14. The control valve 28 which passes through the seal 21 is provided.

In the conventional displacement variable swash plate type compressor 10 configured as described above, the inclination angle of the swash plate 17 is adjusted in response to the pressure difference between the pressure in the swash plate chamber 14 and the suction pressure in the cylinder bore 11a. The stroke distance of the piston 19 connected to the swash plate 17 is changed by the change of the inclination angle of the), and the discharge capacity of the compressor is varied.

As described above, the conventional swash plate type compressor has a structure in which the minimum inclination angle is maintained by the spring 17 in the form of a spring.

In the conventional swash plate type compressor, since the minimum inclination angle is maintained by a simple spring, the initial operability of the compressor driven at the minimum inclination angle when the air conditioner is operated is somewhat insufficient. Occasionally, fluctuations in the minimum angle of inclination were caused.

In particular, since the spring 27 is interposed between the lug plate 16 and the swash plate 27, the assembly work with the drive shaft 15 is cumbersome and the structure itself is complicated.

In addition, conventionally, when the lug plate 16 and the swash plate 27 are rotated by the drive shaft 15, the spring 27 can slide with respect to the lug plate 16 and the swash plate 27 to generate noise during operation. There were many cases.

Technical challenge

The present invention has been made to solve the above-described problems, the object of the present invention is to improve the initial operability of the compressor to operate at the minimum inclination angle when operating the air conditioner while at the same time the abrupt inclination of the swash plate in the compression process when not in operation during air conditioning operation The present invention provides a mechanism spring and a swash plate compressor of a swash plate compressor having a function of buffering a change to a minimum inclination angle.

It is also an object of the present invention to provide a mechanism spring and a swash plate compressor of the swash plate compressor, which is easy to assemble and simple in structure.

Another object of the present invention is to provide a mechanism spring and a swash plate compressor of the swash plate type compressor, which are firmly fixed to the drive shaft and can eliminate friction noise due to sliding contact during operation.

Technical solution

In order to achieve the above object, the mechanism spring fitted to the drive shaft of the swash plate compressor according to the present invention,

In the mechanism spring for maintaining the minimum inclination angle to be fitted to the drive shaft of the swash plate compressor,

A fitting groove is formed at one side to be fitted to the driving shaft, and a flat portion having two extension plates formed therebetween;

A curved support portion composed of two support plates disposed opposite the two extension plates of the flat portion, and convexly curved toward the flat portion when viewed from the side;

It characterized in that it comprises a; curved connection portion consisting of two connecting plates of the curved connecting the one end of the two extension plate and the one end of the two support pieces of the curved support of the flat portion.

Here, it is preferable that the two inner side plates which form the fitting groove of the flat part are arranged in parallel with each other.

In addition, it is preferable that the engaging grooves protruding from the inside of the two extension plates are formed at the entrances of the fitting grooves of the flat portion so as to face each other.

In addition, the through hole is preferably formed near the engaging piece of the flat portion.

In addition, the support plate is preferably formed such that the width thereof becomes narrow toward the other end of the curved support.

On the other hand, the swash plate compressor according to the present invention, the cylinder block having a plurality of cylinder bores, the housing which forms a swash plate chamber and the suction chamber and the discharge chamber is communicated through the cylinder bore and the suction / discharge valve, A drive shaft rotatably supported on the cylinder block and the housing, a swash plate installed on the drive shaft so that the inclination angle can be changed, a spring installed on the drive shaft to elastically support the swash plate, and a swash plate and sliding motion In the swash plate compressor comprising a piston coupled and reciprocally received in the cylinder bore,

The spring is the above-described mechanism spring, characterized in that the front end of the curved support at the minimum inclination angle of the swash plate is installed on the drive shaft to be in contact with the swash plate.

In addition, the swash plate compressor according to the present invention includes a cylinder block having a plurality of cylinder bores, a housing in which a swash plate chamber is formed, and a suction chamber and a discharge chamber are formed in communication with the cylinder bore and an intake / discharge valve; A drive shaft rotatably supported on the cylinder block and the housing, a swash plate installed on the drive shaft so that the inclination angle can be changed, a link connecting the swash plate and the drive shaft, and a spring installed on the drive shaft to elastically support the swash plate. In the swash plate-type compressor is configured to include a piston that is slidably coupled to the swash plate and is reciprocally accommodated in the cylinder bore.

The spring is the above-described mechanism spring, characterized in that the front end of the curved support at the minimum inclination angle of the swash plate is installed on the drive shaft to be in contact with the swash plate or the connecting link.

In this case, it is preferable that circumferential coupling grooves are formed on both side surfaces of the drive shaft so that the inner side surfaces of the two extension plates of the flat portion are fitted.

And, when the two extension plates are fitted to the drive shaft, it is preferable that the two catching pieces are first caught in the drive shaft elastically.

1 is a longitudinal sectional view showing a general structure of a conventional swash plate compressor.

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

3 is an assembled perspective view of the vicinity of the mechanism spring in FIG. 2.

4 is an exploded perspective view of FIG. 3.

FIG. 5 is a perspective view of the mechanism spring in FIG. 3. FIG.

6 is a longitudinal sectional view showing the structure of a swash plate compressor according to another embodiment of the present invention.

Best Mode for Carrying Out the Invention

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

2 to 5 show the structure of the swash plate compressor and the mechanism spring fitted to the drive shaft of the swash plate compressor according to the present embodiment.

As shown, the reciprocating compressor 1000 according to the present embodiment includes a housing 100, a cylinder block 110 having a plurality of cylinder bores 110a, and rotation of the cylinder block 110. The cylinder bore 110a by sliding with the drive shaft 140 supported by the drive shaft 140, the swash plate 150 connected to the drive shaft 140 so that the inclination angle can be changed while being rotated, and the swash plate 150. The housing through the piston 200 accommodated in the reciprocating movement, the suction / discharge valve device 300 installed to face the bottom of the piston 200, and the suction / discharge valve device 300. It comprises a suction chamber 131 and the discharge chamber 132 formed in the (100).

The housing 100 is composed of a front housing 120 and a rear housing 130 with the cylinder block 110 interposed therebetween.

In addition, a suction chamber 131 and a discharge chamber 132 are formed in the rear housing 130, respectively, and a suction hole for communicating the cylinder bore 110a and the suction chamber 131 to the valve plate 330. 331 and a discharge port 332 which communicates the cylinder bore 110a with the discharge chamber 132 are formed, respectively.

In addition, the suction port 331 and the discharge port 332 formed in the valve plate 330, suction for opening and closing the suction port 331 and the discharge port 332 by the pressure change according to the reciprocating motion of the piston 180. A valve and a discharge valve are respectively provided.

The cylinder block 110 has eight cylinder bores 110a, and the refrigerant introduced from the suction chamber 131 is continuously compressed by the piston 200 reciprocating through the cylinder bore 110a. do. Of course, the number of cylinder bores 110a can vary.

The drive shaft 140 is rotatably supported by the front housing 120 and the cylinder block 110 via a bearing 400.

In addition, the swash plate 150 is slidably coupled to the piston 200 via the shoe 201.

Furthermore, connecting projections 155 are formed before and after the swash plate 150, respectively, and a connecting link 600 is interposed between the connecting projection 155 and the driving shaft 140, and the hinge pins 610 are connected to each other. Are connected by Therefore, the connection link 600 and the connection protrusion 155, the connection link 600 and the drive shaft 140 can be hinged with respect to each other.

On the other hand, as shown in Figure 3 and 4, the drive shaft 140 is provided with a mechanism spring 160 for maintaining the minimum inclination angle of the swash plate 150.

)으로 되어 있다. 특히, 전개하였을 경우, 상기 구동축(140)의 둘레에 끼울 수 있도록 판에 기다란 홈이 형성된 구조로 되어 있다.Although the mechanism spring 160 is bent at various curvatures, the mechanism spring 160 is flat when deployed.

) In particular, when deployed, an elongated groove is formed in the plate so as to fit around the drive shaft 140.

Referring to the structure of the mechanism spring 160 on the basis of the final completed structure in more detail as follows.

As shown in FIG. 5, the mechanism spring 160 has a flat portion 161, a curved support portion 162 disposed to face the flat portion 161, and the flat portion 161 and the curved support portion ( It is comprised by the curved connection part 163 which connected the 162 to each other, and is a leaf spring which becomes substantially "R" shape when seen from the side.

Although the mechanism spring 160 has a complicated shape, it is necessary to match the center of gravity G when viewed from the side with the center of rotation of the drive shaft 140 in order to prevent the deflection caused by the eccentricity during rotation.

Specifically, the flat portion 161 is a portion that is directly fitted to the drive shaft 140, the fitting groove 161a is formed on one side to be fitted to the drive shaft 140, so that the fitting groove 161a between the two Two extension plates 161b are formed.

In this case, the inner side of the two extension plates 161b forming the fitting grooves 161a of the flat portion 161 may be disposed in parallel with each other. The two extension plates 161b are actually coupled to the drive shaft 140, and the inner side of the extension plate 161b is fitted into the coupling groove 144 formed around the drive shaft 140 when assembled. .

In addition, at the inlet of the fitting groove 161a of the flat portion 161, the engaging pieces 161c protruding from the inside of the two extension plates 161b are formed and disposed to face each other. When the two extension plates 161b are coupled to the drive shaft 140, first, the two locking pieces 161c elastically ride over the drive shaft 140, so that the spring after the coupling is in the assembling direction. It can be prevented from leaving again.

In addition, a through hole 161d is formed near the engaging piece 161c of the flat portion 161. Accordingly, the elasticity is further improved when the locking piece 161c crosses the driving shaft 140, thereby enabling a more smooth coupling.

The curved support portion 162 is composed of two support plates 162a disposed to face the two extension plates 161b of the flat portion 161, and the flat portion 161 is viewed from the side. It is formed to bend convexly. That is, the curved support portion 162 is configured to move away along the flat portion 161 and close again.

Here, the support plate 162a is formed to be narrow in width toward the other end of the curved support portion 162. Accordingly, the contact area between the support plate 162a and the swash plate or the connecting link is reduced, thereby avoiding interference with the surrounding structure during contact.

In addition, the curved connection portion 163 has two curved portions connecting one end of two extension plates 161b of the flat portion 161 and one end of two support pieces 162a of the curved support portion 162, respectively. It is comprised by the connecting plate 163a. As viewed from the side, the curved connection portion 163 is preferably arcuate but not necessarily arcuate.

According to this configuration, the mechanism spring 160 is firmly fitted to the drive shaft 140 to rotate with the drive shaft 140.

At the time of assembly of the mechanism spring 160, it is fitted to the circumference of the drive shaft 140 from the curved connection portion 163, but the part that is actually coupled is the inner side of the two extension plates 161b of the flat portion 161. And a coupling groove 144 around the drive shaft 140.

In this case, since the engaging piece 161c protruding from the inner side of the extension plate 161b elastically rides over the coupling groove 144 of the drive shaft 140, the mechanism spring 160 is the drive shaft 140. ) Can be prevented from deviating.

Accordingly, when the swash plate 150 comes to a minimum inclination angle state, the front end of the support plate 162a of the mechanism spring 160 elastically contacts the side of the swash plate 150 or the link link 600 so that the swash plate 150 It is possible to elastically maintain the minimum inclination angle of 150.

6 shows a structure in which the mechanism spring according to the present invention is mounted on the conventional swash plate compressor of FIG. 1. Since the surrounding structure has been described in the related art, duplicate description thereof will be omitted.

As shown, the mechanism spring according to the present invention can be firmly installed on the drive shaft of a conventional swash plate type compressor to maintain its minimum inclination angle by contacting the swash plate.

According to the present invention of the configuration as described above, the swash plate in the compression process when not operating during the operation of the air conditioner at the same time improves the initial operability of the compressor driven at the minimum inclination angle when the air conditioner is composed of a spring instead of a spring form The fluctuation of the inclination angle to the sharpest minimum inclination angle can be easily buffered.

In addition, according to the present invention, since the spring is assembled by forming a coupling groove around the drive shaft and sandwiching the coupling groove, the assembly operation is easy and the structure is very simple.

In addition, according to the present invention, by the coupling of the coupling groove of the drive shaft and the extension plate of the flat portion and the coupling of the drive shaft of the engaging piece, the drive shaft and the mechanism spring is firmly fixed, thereby eliminating frictional noise due to sliding contact during operation of the compressor. .

Claims (10)

In the mechanism spring for maintaining the minimum inclination angle to be fitted to the drive shaft of the swash plate compressor, A fitting groove is formed at one side to be fitted to the driving shaft, and a flat portion having two extension plates formed therebetween; A curved support portion composed of two support plates disposed opposite the two extension plates of the flat portion, and convexly curved toward the flat portion when viewed from the side; Fitted to the drive shaft of the swash plate compressor comprising a; curved connecting portion consisting of two connecting plates of the curved connecting the one end of the two extension plate and the one end of the two support pieces of the curved support portion, respectively Mechanism spring. The method of claim 1, Mechanism spring to be fitted to the drive shaft of the swash plate compressor characterized in that the two inner side of the extension plate forming the fitting groove of the flat portion are arranged in parallel with each other. The method of claim 2, Mechanism spring to be fitted to the drive shaft of the swash plate compressor, characterized in that the engaging groove inlet is formed at the inlet of the flat portion is formed so as to face each other protruding from the inside of the two extension plate. The method of claim 3, Mechanism spring to be fitted to the drive shaft of the swash plate compressor characterized in that the through hole is formed in the vicinity of the engaging piece of the flat portion. The method of claim 3, The support plate is a mechanism spring that is fitted to the drive shaft of the swash plate compressor, characterized in that the width is narrowed toward the other end of the curved support. The method of claim 1, Mechanism spring with a center of gravity coinciding with the axis of the drive shaft when viewed from the side. A cylinder block having a plurality of cylinder bores, a housing formed with a swash plate chamber, and a suction chamber and a discharge chamber communicating with the cylinder bore and a suction / discharge valve, and rotatably supported by the cylinder block and the housing. A drive shaft, a swash plate installed to change the inclination angle of the drive shaft, a spring installed on the drive shaft to elastically support the swash plate, and slidably coupled to the swash plate to enable reciprocating movement of the cylinder bore. In the swash plate compressor comprising a piston accommodated, The spring is the mechanism spring according to any one of claims 1 to 6, wherein the swash plate compressor is installed on the drive shaft so that the tip of the curved support portion is in contact with the swash plate at the minimum inclination angle of the swash plate. A cylinder block having a plurality of cylinder bores, a housing formed with a swash plate chamber, and a suction chamber and a discharge chamber communicating with the cylinder bore and a suction / discharge valve, and rotatably supported by the cylinder block and the housing. A drive shaft, a swash plate installed to change the inclination angle of the drive shaft, a link connecting the swash plate and the drive shaft, a spring installed on the drive shaft to elastically support the swash plate, and slidably coupled to the swash plate. In the swash plate compressor comprising a piston that is reciprocally accommodated in the cylinder bore, The spring is a mechanism spring according to any one of claims 1 to 6, and the swash plate compressor, characterized in that the tip of the curved support at the minimum inclination angle of the swash plate is installed on the drive shaft to be in contact with the swash plate or the connecting link. . The method according to claim 7 or 8, A swash plate-type compressor, characterized in that circumferential coupling grooves are formed on both side surfaces of the drive shaft so that the inner side surfaces of the two extension plates of the flat portion are fitted. The method of claim 9, When the two extension plates are fitted to the drive shaft, the swash plate compressor characterized in that the two engaging pieces are first caught in the drive shaft elastically.

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