KR101452501B1 - Compressor - Google Patents

Abstract

The present invention relates to a compressor. In the present invention, the outer appearance and the skeleton of the cylinder block 100 are formed by the block body 101. The block body 101 is formed with a center bore 102 in which a drive shaft 40 is rotatably installed and a fixing groove 103 surrounding the inner circumferential surface of the center bore 102 is formed. A front housing 20 is installed at one end of the cylinder block 100. A shaft hole (23) is formed in the front housing (20). A bush 110 is installed on the center bore 102 and the shaft hole 23 to smoothly rotate the drive shaft 40. A fixing protrusion 113 is formed on the bush 110. The fixing protrusions 113 protrude from the outer circumferential surface of the bush 110 and are inserted into the fixing grooves 103 of the center bore 102 or the fixing grooves of the shaft hole 23. According to the present invention having such a construction, a fixing groove 103 is formed in the center bore 102 of the cylinder block 100 and the shaft hole 23 of the front housing 20, The bush 110 is firmly fixed to the center bore 102 of the cylinder block 100 and the shaft hole 23 of the front housing 20 since the fixing protrusion 113 is formed to be protruded and inserted into the fixing groove 103. [ So that the bush 110 is prevented from being detached from the center bore 102 or the front housing 20.

Compressor, front housing, cylinder block, bush, fixing groove, fixing projection

Description

Compressor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor, and more particularly, to a compressor in which a refrigerant is compressed by a piston in a cylinder bore as the rotary shaft rotates to receive a driving force of the engine.

The compressor used in the automobile air conditioning system sucks the evaporated refrigerant from the evaporator and transfers it to the condenser at a high temperature and high pressure state which is easy to be liquefied.

In such a compressor, there is a reciprocating type in which compression is performed while reciprocating motion is actually performed for compressing the refrigerant, and a rotary type in which compression is performed while rotating. In the reciprocating type, there is a crank type in which the driving force of the driving source is transmitted using a crankshaft, a swash plate type in which the swash plate is transmitted, and a wobble plate type in which a wobble plate is used. Rotary types include rotary rotary axes with vane rotary vanes, scrolling with rotary scrolls and fixed scrolls.

FIG. 1 is a partial cross-sectional view of an internal structure of a conventional compressor. According to this, the center bore 11 is formed through the center of the cylinder block 10. A plurality of cylinder bores 13 are formed through the cylinder block 10 radially surrounding the center bore 11. A piston (15) is movably installed in the cylinder bore (13). The piston 15 has a cylindrical shape, and the cylinder bore 13 has a cylindrical shape corresponding thereto. A connecting portion 17 is formed at a portion of the one end of the piston 15 protruding outside the cylinder bore 13. The piston 15 compresses the refrigerant in the cylinder bore 13.

A front housing 20 is installed at one end of the cylinder block 10. The front housing 20 is coupled with the cylinder block 10 to form a crank chamber 21 therein. The crank chamber 21 is kept airtight with the outside. A shaft hole (23) is formed through the front housing (20).

A rear housing 30 is provided on the opposite side of the other end of the cylinder block 10 on which the front housing 20 is installed. A suction port (not shown) and a discharge port (not shown) are formed in the rear housing 30. The suction port serves to transfer the refrigerant coming from the outside of the rear housing 30 to the suction chamber 31 to be described below. The suction port is formed to communicate with the suction chamber (31). The discharge port is formed to communicate with the discharge chamber 33 to be described below. And the discharge port serves to transfer the compressed air to the outside in the cylinder bore 13. [

A suction chamber 31 is formed in the rear housing 30 so as to selectively communicate with the cylinder bore 13. The suction chamber 31 is formed at a position adjacent to the edge of the rear housing 30 facing the cylinder block 10. The suction chamber 31 serves to transfer the refrigerant to be compressed into the cylinder bore 13.

A discharge chamber (33) is formed in the rear housing (30). The discharge chamber (33) is also selectively communicated with the cylinder bore (13). The discharge chamber (33) is formed in a region of the rear housing (30) corresponding to the center of the surface facing the cylinder block (10). The discharge chamber (33) is a place where refrigerant compressed in the cylinder bore (13) is discharged and temporarily stays. A control valve 38 is provided on one side of the rear housing 30. The control valve 38 is for adjusting the angle of the swash plate 48, which will be described below.

The bolts B are fastened through the cylinder block 10, the front housing 20, and the rear housing 30 to each other. A plurality of bolts B pass through the edges of the cylinder block 10, the front housing 20, and the rear housing 30 to perform a tightening action.

A drive shaft 40 is installed to be rotatable through the center bore 11 of the cylinder block 10 and the shaft hole 23 of the front housing 20. The driving shaft 40 is rotated by the driving force transmitted from the engine.

A bush 42 is installed in the center bore 11 of the cylinder block 10 and the shaft hole 23 of the front housing 20. The bush 42 is formed in a substantially hollow cylindrical shape. The bush 42 is installed in the center bore 11 of the cylinder block 10 and the shaft hole 23 of the front housing 20 to smooth the rotation of the drive shaft 40.

A rotor 44 is provided in the crank chamber 21 so that the drive shaft 40 passes through the center and is integrally rotated with the drive shaft 40. The rotor 44 is fixed to the drive shaft 40 in a substantially disc shape.

A swash plate (48) is hingedly coupled to the rotor (44) to rotate together with the drive shaft (40). The swash plate 48 is installed at a variable angle with respect to the drive shaft 40 according to the discharge capacity of the compressor. That is, the driving shaft 40 is perpendicular to the longitudinal direction of the driving shaft 40 or inclined at a predetermined angle with respect to the driving shaft 40. The swash plate 48 has its edge 50 connected to the pistons 15 via a shoe 50. That is, the edge of the swash plate 48 is connected to the connecting portion 17 of the piston 15 through the shoe 50, and the swash plate 48 is rotated by the rotation of the cylinder bore 13 of the piston 15, Let it reciprocate.

A washer 62 is installed at one end of the drive shaft 40 located in the center bore 11 of the cylinder block 10. One end of the shaft elastic member 64 is supported on the washer 62 at one end of the drive shaft 40. The shaft elastic member 64 exerts an elastic force to push the driving shaft 40 toward the front housing 20 by a cylindrical coil spring so as to prevent the driving shaft 40 from being pushed toward the rear housing 30 And supports the drive shaft 40 at the same time.

A valve assembly 70 is provided between the cylinder block 10 and the rear housing 30 to control the flow of refrigerant between the suction chamber 31 and the discharge chamber 33 and the cylinder bore 13. That is, the valve assembly 70 controls the refrigerant flow from the suction chamber 31 to the cylinder bore 13 and from the cylinder bore 13 to the discharge chamber 33.

The operation of the compressor having such a structure will be described. The swash plate 48 is rotated together with the driving shaft 40 as the driving shaft 40 rotates by the driving force transmitted from the outside. The rotation of the swash plate 48 causes the piston 15 to linearly reciprocate within the cylinder bore 13. [

At this time, as the drive shaft (40) rotates, the refrigerant in the suction chamber (31) is sequentially sucked into each cylinder bore (13). When the refrigerant is delivered to the cylinder bore 13, the piston 15 of the corresponding cylinder bore 13 moves toward the valve assembly 70 and the refrigerant is compressed.

Thus, when the refrigerant is compressed in the cylinder bore 13, the pressure inside the cylinder bore 13 becomes relatively high, and the refrigerant is transferred to the discharge chamber 33. In this state, when the inclination angle of the swash plate 40 is varied by the control valve 38, the amount of the refrigerant compressed in the cylinder bore 13 varies, so that the discharge amount of the refrigerant is varied.

However, the above-described conventional compressor has the following problems.

The bush 42 is simply press-fitted into the center bore 11 of the cylinder block 10 and the shaft hole 23 of the front housing 20 so that the inner peripheral surface of the bush 42 contacts the outer peripheral surface of the drive shaft 40 . Since the bush 42 does not have a fixed structure, the bush 42 is rotated in the longitudinal direction of the drive shaft 40 by the drive shaft 40, which generates an instantaneous thrust as the swash plate 48 rotates. There is a problem that the compressor is deviated from its position to cause a failure of the compressor.

The bush 42 is press-fitted into the center bore 11 of the cylinder block 10 and the shaft hole 23 of the front housing 20 so that the center of the cylinder block 10 There is a problem that the inside of the bore 11 and the shaft hole 23 of the front housing 20 is deformed or scratched.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a compressor in which a bush is firmly fixed inside a center bore of a cylinder block.

An object of the present invention is to provide a compressor in which a bush is compressed and fixed to the inner peripheral surface of a center bore of a cylinder block.

According to an aspect of the present invention for achieving the above object, the present invention provides a scroll fluid machine including a center bore penetrating through a center, a plurality of cylinder bores compressing a refrigerant while reciprocating the piston linearly, A cylinder block formed to pass through the cylinder; A front housing installed at one end of the cylinder block and formed with a shaft hole penetrating through the center, and forming a crank chamber by being engaged with the cylinder block; A drive shaft that transmits power for linear reciprocating motion of the piston and is rotatably installed through a shaft hole of the center bore of the cylinder block and a shaft hole of the front housing; And a bush installed on at least one side of a center bore of the cylinder block and a shaft hole of the front housing to smoothly rotate the drive shaft, At least one fixing protrusion is formed at a position corresponding to the fixing groove on the outer circumferential surface of the bush and the fixing protrusion is formed by a protrusion forming jig after the bush is installed on the inner circumferential surface of the center bore .

The fixing protrusions are formed in a hemispherical shape.

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The protrusion forming jig may include a cylindrical portion protruding from the outer circumferential surface of the protrusion forming portion to form the fixing protrusion and having one side separated by a gap in a direction in which the bush is inserted, An insertion portion inserted into the cylindrical portion and formed to have a larger diameter in a direction to be inserted into the cylindrical portion so that the outer peripheral surface of the cylindrical portion is in contact with the inner peripheral surface of the bush; And a grip portion protruding from one end of the insertion portion having a relatively large diameter.

In the present invention, a fixing groove is formed in the center bore of the cylinder block, and a fixing protrusion is formed on the bush and inserted into the fixing groove. Accordingly, since the bush is firmly fixed to the inside of the center bore of the cylinder block to prevent the bush from being separated from the cylinder block, the drive shaft can rotate smoothly, thereby improving the durability of the compressor.

Since the outer circumferential surface of the bush is press-fitted into the inner circumferential surface of the center bore of the cylinder block and the fixing protrusion is protruded from the outer circumferential surface of the bush and inserted into the fixing groove of the center bore of the cylinder block, the center bore of the cylinder block is deformed or scratched There is also an effect to be prevented.

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

3 is a partial sectional perspective view showing the structure of a cylinder block constituting an embodiment of the present invention. FIG. 4 is a cross-sectional view of the compressor according to the present invention. The configuration of the bush constituting the embodiment of the invention is shown in a perspective view. The compressor according to the present invention is similar in construction to the compressor shown in FIG. 1 except for the cylinder block and the bush, because the compressor has the essentials in the construction of the cylinder block and the bush. Therefore, only the cylinder block and the bush having the different structure from the conventional art will be described. Further, in the embodiment of the present invention, the same components as those of the conventional compressor are described with reference to the reference numerals of the prior art drawings.

As shown in these drawings, the outer appearance and the skeleton of the cylinder block 100 are formed by the block body 101. The block body 101 has a substantially cylindrical shape, and the front housing 20 and the rear housing 30 are coupled to both ends of the block body 101, respectively.

As shown in FIG. 3, a center bore 102 is formed through the center of the block body 101. The center bore 102 is a portion where the drive shaft 40 is rotatably installed.

A fixing groove 103 is formed on the inner peripheral surface of the center bore 102. The fixing groove 103 is formed so as to surround the inner peripheral surface of the center bore 102. The fixing groove 103 is a portion into which the fixing protrusion 113 of the bush 110 is inserted, which will be described below.

A plurality of cylinder bores 102a are formed so as to penetrate the block body 101 radially around the center bore 102. A piston 15 is installed in the cylinder bore 102a so as to reciprocate linearly. The piston 15 has a cylindrical shape, and the cylinder bore 102a has a cylindrical shape corresponding thereto.

A bush 110 is installed in the center bore 102. The bush 110 has an outer appearance and a skeleton formed by the bush body 111. The bush body 111 is formed into a substantially hollow cylindrical shape. The bush body 111 is for smoothly rotating the drive shaft 40 in the inside of the front housing 20 and the cylinder block 100. The bush body 111 is press-fitted into the inner peripheral surface of the center bore 102.

As shown in FIG. 4, the bush body 111 has a fixing protrusion 113 formed thereon. The fixing protrusion 113 protrudes from the outer circumferential surface of the bush body 111 by a predetermined height. At least one of the fixing protrusions 113 is formed around the outer circumferential surface of the bush body 111. In the present embodiment, the fixing protrusions 113 are formed at four spaced apart circumferential surfaces of the bush body 111 at predetermined intervals. The fixing protrusions 113 are formed in a substantially hemispherical shape. The fixing protrusion 113 is inserted into the fixing groove 103 of the center bore 102 to prevent the bush 110 from being separated from the center bore 102.

The fixing protrusions 113 are formed to protrude from the outer surface. That is, the fixing protrusion 113 is formed on the inner surface of the bush body 111 and protruded on the outer surface thereof. In other words, the fixing protrusions 113 are formed on the entire bush body 111 so as to protrude in the same direction.

In another embodiment, the fixing protrusion 113 may be formed in the shape of the protrusion forming jig 200 after being inserted into the center bore 102. 5, the protrusion forming jig 200 is formed with a cylindrical portion 201 to be inserted into the internal space S of the bush 110. The cylindrical portion 201 is formed such that one side thereof is separated in a direction in which the bushes 110 are inserted and has an interval g. This is to make the outer diameter of the cylindrical portion 201 larger as the insertion portion 204, which will be described below, is inserted into the cylindrical portion 201.

On the outer peripheral surface of the cylindrical portion 201, a protrusion forming portion 202 is formed to protrude. The protrusion forming portion 202 is formed in a shape corresponding to the fixing protrusion 113. That is, the protrusion forming portion 202 is formed to protrude from the outer peripheral surface of the cylindrical portion 201 in a substantially hemispherical shape. The protrusion forming portions 202 are spaced apart from each other by a predetermined distance.

An insertion portion 204 is provided above the cylindrical portion 201 with reference to FIG. The insertion portion 204 is formed in a substantially cylindrical shape. The insertion portion 204 is formed to have a larger diameter in a direction to be inserted into the cylindrical portion 201. This is for increasing the outer diameter of the cylindrical portion 201 by the insertion portion 204 in the process of being inserted into the cylindrical portion 201.

A handle portion 206 is formed at one end of the insertion portion 204 having a relatively large diameter at both ends. The handle 206 is formed to protrude from one end of the insertion portion 204. The handle portion 206 is substantially cylindrical and is gripped by an operator for smooth insertion of the insertion portion 204.

Hereinafter, the operation of the compressor according to the present invention will be described in detail.

The bush 110 is installed in the center bore 102 of the cylinder block 100. The bore 110 of the cylinder block 100 is directed toward the center bore 102 of the cylinder block 100, .

In this state, the operator grasps the handle 206 of the protrusion forming jig 200 and inserts the cylindrical portion 201 of the protrusion forming jig 200 into the inner space S of the bush 110, Into the bore (102). 5, the outer circumferential surface of the cylindrical portion 201 is in close contact with the inner circumferential surface of the bush 110, and the outer circumferential surface of the cylindrical portion 201 is in close contact with the inner circumferential surface of the bush 110, And inserted into the center bore 102 together.

At the same time, the outer circumferential surface of the insertion portion 204 of the protrusion forming jig 200 comes into close contact with the inner circumferential surface of the cylindrical portion 201 and enters the inside of the cylindrical portion 201. That is, when the cylindrical portion 201 of the protrusion forming jig 200 is inserted into the center bore 102 together with the bush 110, the insertion portion 204 of the protrusion forming jig 200 And is inserted into the cylindrical portion 201. At this time, since the insertion portion 204 of the protrusion forming jig 200 is formed to have a wider diameter toward the bush 110, the gap g of the cylindrical portion 201 is widened.

 The outer circumferential surface of the bush 110 is brought into close contact with the inner circumferential surface of the center bore 102 while the protrusion forming jig 200 Is also completely inserted into the internal space S of the bush 110. As shown in FIG.

At this time, when the insertion portion 204 of the protrusion forming jig 200 is completely inserted into the cylindrical portion 201, the gap g of the cylindrical portion 201 becomes wider, 201 are closely contacted with the inner circumferential surface of the bush 110.

When the protrusion forming portion 202 of the cylindrical portion 201 moves in the centrifugal direction of the bush 110, the protrusion forming portion 20 pushes the inner circumferential surface of the bush 110 to plastic deform do. In this case, a fixing protrusion 113 having a shape corresponding to the protrusion forming portion 202 of the cylindrical portion 201 protrudes from the outer circumferential surface of the bush 110. At this time, the fixing protrusion 113 is formed in the fixing groove 103 of the center bore 102.

Since the bush 110 is pressed into the inner circumferential surface of the center bore 102 and the fixing protrusion 113 of the bush 110 is inserted into the fixing groove 103 of the center bore 102, The bush 110 can be firmly fixed in the center bore of the cylinder block to prevent the bush 110 from being disengaged from the drive shaft 40 so that the drive shaft 40 can rotate smoothly.

The outer circumferential surface of the bush 110 is press-fitted into the inner circumferential surface of the center bore 102 and the fixing protrusion 113 protrudes from the outer circumferential surface of the bush 110, The center bore 102 of the cylinder block 100 is prevented from being deformed or scratched.

Next, the operation of the compressor will be described. The swash plate 48 rotates together with the driving shaft 40 as the driving shaft 40 rotates by the driving force transmitted from the outside. The rotation of the swash plate 48 causes the piston 15 to reciprocate linearly within the cylinder bore 102a.

As the driving shaft 40 rotates, the refrigerant sucked into the suction chamber 31 through the suction port is sequentially sucked into the respective cylinder bores 102a. When the refrigerant is transferred into the cylinder bore 102a, the piston 15 of the corresponding cylinder bore 102a moves in the direction of the valve assembly 70, and the refrigerant is compressed.

When the refrigerant is compressed in the cylinder bore 102a, the pressure in the cylinder bore 102a becomes relatively high, and the refrigerant is delivered to the discharge chamber 33. [ In this state, when the inclination angle of the swash plate 48 is varied by the control valve 38, the amount of the refrigerant compressed in the cylinder bore 102a is varied, so that the discharge amount of the refrigerant is varied.

The scope of the present invention is not limited to the embodiments described above, but may be defined by the scope of the claims, and those skilled in the art may make various modifications and alterations within the scope of the claims It is self-evident.

The fixing protrusion 113 of the bush 110 may be formed in the center bore 102 of the cylinder block 100 so that the fixing groove 103 is recessed. For example, the inner circumferential surface of the shaft hole 23 of the front housing 20 through which the drive shaft 40 passes may be formed with a fixing groove 103 into which the fixing protrusion 113 of the bush 110 is inserted.

In the embodiment of the present invention, a plurality of fixing protrusions 113 of the bush 110 are spaced apart from the outer circumferential surface of the bush body 111 by a predetermined distance, but the present invention is not limited thereto. For example, the fixing protrusion 113 of the bush 110 may be formed around the outer circumferential surface of the bush body 111.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view showing an internal structure of a conventional compressor.

FIG. 2 is a partial cross-sectional perspective view showing a configuration of a main part of a compressor according to the present invention; FIG.

3 is a partial cross-sectional perspective view showing a configuration of a cylinder block constituting an embodiment of the present invention.

4 is a perspective view showing a configuration of a bush constituting an embodiment of the present invention.

5 is a perspective view showing a configuration of a projection forming jig for forming a fixing projection in a bush constituting another embodiment of the present invention.

Description of the Related Art [0002]

100: cylinder block 101: block body

102: center bore 102a: cylinder bore

103: fixing groove 110: bush

111: bush body 113: fixing projection

200: protrusion forming jig 201: cylindrical portion

202: protrusion forming section 204:

206: Handle S: Interior space

Claims (4)

A plurality of cylinder bores 102a through which the center bore 102 passes and which compress the refrigerant while linearly reciprocating the piston 15 are formed in the cylinder bore 102, (100); A front housing 20 installed at one end of the cylinder block 100 and having a shaft hole 23 penetrating through the center thereof and forming a crank chamber 21 therein by engaging with the cylinder block 100; And a driving shaft 40 which is rotatably installed through the shaft bore 102 of the cylinder block 100 and the shaft hole 23 of the front housing 20 to transmit power for linear reciprocation of the piston 15, ); And And a bush 110 installed on at least one side of the center bore 102 of the cylinder block 100 and the shaft hole 23 of the front housing 20 so that the drive shaft 40 is smoothly rotated. In this case, A fixing groove 103 is formed to surround an inner circumferential surface of the center bore 102 on which the bush 110 is installed and an outer circumferential surface of the bush 110 is provided with at least one A fixing protrusion 113 is formed to protrude, Wherein the fixing protrusion (113) is formed by a protrusion forming jig (200) after the bush (110) is installed on the inner peripheral surface of the center bore (102). The method according to claim 1, Wherein the fixing protrusions (113) are formed in a hemispherical shape. delete The method according to claim 1, The protrusion forming jig (200) A cylindrical portion 201 protruding from the outer circumferential surface of the protrusion forming portion 202 forming the fixing protrusion 113 and separated from the bush 110 in a direction in which the bush 110 is inserted, ; An insertion portion inserted into the cylindrical portion 201 and formed to have a larger diameter in a direction to be inserted into the cylindrical portion 201 so that the outer peripheral surface of the cylindrical portion 201 is in close contact with the inner peripheral surface of the bush 110 204); And And a grip portion (206) formed to protrude from one end of the insertion portion (204) having a relatively large diameter at both ends thereof.

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