KR101348854B1 - Compressor - Google Patents

Abstract

The present invention relates to a compressor, which uses a drive shaft (30) having a swash plate (40) to drive a piston (50) in a linear reciprocating motion in a cylinder bore (21) formed in the front and rear cylinder blocks (20, 20a). do. A shoe 145 is provided between the piston 50 and the swash plate 40 to smoothly interlock the two. At this time, the bottom surface 145 ′ in contact with the swash plate 40 of the shoe 145 is provided with a lubrication tool 146 concaved in the radial direction thereof. According to the present invention, the lubricating oil may flow into the lubrication opening 146 of the shoe 145, even if the compressor 1 is restarted for a predetermined time between the shoe 145 and the swash plate 40 Since lubricating oil may be directly supplied to the lubricating oil, friction between the shoe 145 and the swash plate 40 is reduced.

Compressor, swash plate, piston, shoe, lube

Description

Compressor

The present invention relates to a compressor, and more particularly to a compressor in which the working fluid is delivered to the cylinder bore and the working fluid is compressed in the cylinder bore by a piston driven by a swash plate installed on the rotating shaft.

Generally, a compressor used in an automotive air conditioning system sucks a vaporized working fluid from an evaporator and transfers it to a condenser in a high-temperature and high-pressure state which is easy to be liquefied.

In such a compressor, there is actually a reciprocating type in which compression is performed while reciprocating movement of the working fluid is compressed, 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.

1 illustrates a configuration of a general swash plate compressor. A schematic configuration of a swash plate compressor will be described with reference to the drawings.

As shown, the compressor 1 is coupled to the front housing 10 in which the front cylinder block 20 is built and the rear housing 10a in which the rear cylinder block 20a is built. At this time, the suction chamber 11 and the discharge chamber 12 are formed inside the front and rear housings 10 and 10a to allow the working fluid to enter and exit.

The front and rear cylinder blocks 20 and 20a are provided with a plurality of cylinder bores 21 therein, and the piston 50 to be described later is straight on the cylinder bores 21 corresponding to each other of the front and rear cylinder blocks 20 and 20a. Coupled to reciprocate. In addition, the cylinder bore 21 is provided with a swash plate 40 to be described later to be inclined and coupled to the piston 50.

A plurality of suction passages 22 are formed in the front and rear cylinder blocks 20 and 20a. The suction passage 22 serves to flow the working fluid supplied to the swash plate chamber 24 provided between the front and rear cylinder blocks 20 and 20a to the suction chamber 11.

A support hole 25 is formed in the center of the front and rear cylinder blocks 20 and 20a to support the drive shaft 30, and a needle roller bearing 26 is provided in the support hole 25 to provide the drive shaft ( 30) is rotatably supported.

An approximately disc shaped swash plate 40 is inclined with respect to the extending direction of the drive shaft 30 in the drive shaft 30. The center of the swash plate 40 is provided with a hub 44 having a cylindrical shape, the drive shaft 30 penetrates the hub 44.

Then, a plurality of shoes 45 surrounding the edge of the swash plate 40 is installed. The shoe 45 is located between the swash plate 40 and the piston 50 to reduce the friction between the two, as shown in Figure 2, is formed in a hemispherical shape. More precisely, the bottom surface 45 'of the shoe 45 is in contact with the swash plate 40 and the hemispherical surface 45' 'is inserted into the shoe seating groove 52 of the piston 50 to be described later and is rotatable. Stays in the state.

The piston 50 is to linearly reciprocate the inside of the cylinder bore (21). The piston 50 has a substantially cylindrical shape corresponding to the inside of the cylinder bore 21, and both ends thereof are located in the cylinder bore 21 of the front and rear cylinder blocks 20 and 20a, respectively. That is, both ends of the one piston 50 serves to compress the working fluid in the cylinder bore 21. The piston 50 is coupled to the middle of the shoe 45, the linear reciprocating motion according to the rotation of the swash plate (40).

The piston 50 is formed so that the shoe seating groove 52 is recessed. The shoe seating groove 52 is a portion in which the shoe 45 is inserted and seated, and is formed to be recessed in a hemispherical shape so as to correspond to the shape of the shoe 45.

The valve unit 60 is installed between the front and rear housings 10 and 10a and the front and rear cylinder blocks 20 and 20a. The valve unit 60 includes a valve plate having a refrigerant suction hole (not shown) and a refrigerant discharge hole (not shown) communicating with the suction chamber 11, the discharge chamber 12, and the cylinder bore 21, respectively. 62). Through this, the valve unit 60 serves to control the discharge of the working fluid compressed in the cylinder bore 21 to the outside of the cylinder bore 21.

At this time, the valve unit 60 is provided with a suction side gasket 65 to seal between the valve plate 60 and the front and rear cylinder blocks (20, 20a), the valve unit 60 and the front and rear housings (10, The discharge side gasket 66 is installed to seal between 10a).

On the other hand, the muffler 70 is installed on the upper outer peripheral surface of the rear housing (10a). The muffler 70 supplies the working fluid transferred from the evaporator to the compressor 1 during the suction stroke of the piston 50, and condensers the cold veins compressed inside the compressor 1 during the compression stroke of the piston 50. It serves to discharge the page. Reference numeral 80 is a bolt.

The circulation process of the working fluid of the compressor as described above will be described.

The working fluid supplied from the evaporator is sucked into the suction part of the muffler 70 and then supplied to the swash plate chamber 24 between the front and rear cylinder blocks 20 and 20a through the refrigerant suction port 71, and the swash plate chamber 24 is provided. Refrigerant supplied to) flows into the suction chamber 11 of the front and rear housings 10 and 10a along the suction passages 22 formed in the front and rear cylinder blocks 20 and 20a.

In addition, the working fluid is sucked into the cylinder bore 21 through the valve plate 62 during the suction stroke of the piston 50. In addition, during the compression stroke of the piston 50, the working fluid compressed in the cylinder bore 21 is compressed. In this case, the working fluid flows into the discharge chamber 12 through the valve plate 62. Finally, the working fluid is discharged to the discharge portion of the muffler through the refrigerant discharge port 72 of the muffler 70.

At this time, as the drive shaft 30 is rotated by a driving force transmitted from the outside, the swash plate 40 is rotated with the rotation of the rotary shaft 40, thereby operating the piston 50. That is, the rotation of the swash plate 40 causes the piston 50 to make a linear reciprocating motion inside the cylinder bore 34. And between the hub 44 and the piston 50 of the swash plate 40 is provided with a shoe 45 to smooth the sliding between the two.

However, the above-described conventional techniques have the following problems.

The piston 50 is a linear reciprocating motion in the cylinder bore 21 in accordance with the rotation of the swash plate 40, the shoe 45 is used to reduce the friction between the piston 50 and the swash plate 40 do. Here, the bottom surface 45 ′ of the shoe 45 is in contact with the swash plate 40, and lubricating oil is applied between the two to reduce friction and enable smooth rotation.

However, when the compressor 1 stops operation and restarts after a predetermined time has elapsed, the lubricating oil has already escaped between the bottom surface 45 'of the shoe 45 and the swash plate 40. As the frictional force between the shoe 45 and the swash plate 40 increases, the efficiency of the compressor 1 is deteriorated, and there is a problem that durability is poor due to wear.

In addition, the bottom surface 45 'of the shoe 45 and the surface of the swash plate 40 are formed in a plane corresponding to each other and maintained in close contact with each other. Accordingly, the friction surface between the bottom surface 45 'of the shoe 45 and the surface of the swash plate 40 increases, thereby increasing the frictional force, thereby increasing the frictional heat between the two.

Therefore, an object of the present invention is to solve the problems of the prior art as described above, so that even if the compressor is restarted after stopping the operation for a predetermined time so that lubricating oil can be quickly supplied between the swash plate and the shoe. will be.

Another object of the present invention is to minimize the contact area between the swash plate and the shoe.

According to a feature of the present invention for achieving the object as described above, the present invention comprises a front and rear housing to form an outer appearance of at least both ends of the compressor; A cylinder block located between the front and rear housings and having a plurality of cylinder bores formed around the shaft support hole passing through the center thereof, wherein the cylinder support hole and the cylinder bore communicate with each other through a suction passage; A rotating shaft on which the swash plate is installed to be rotatable; And a plurality of pistons linearly reciprocating in the cylinder bore according to the rotational motion of the swash plate; A compressor provided between the swash plate and the piston, the shoe comprising a bottom surface in contact with the swash plate and a hemispherical surface inserted into a shoe seating groove formed in the piston, wherein the bottom surface of the shoe in contact with the swash plate in the radial direction A lubricating tool is formed to be recessed along the opening, and the lubricating tool is opened toward the swash plate and an opening is opened to the hemisphere.

The lubrication tool of the shoe is wider from the inside toward the opening, and deeper from the opening toward the inside.

The lubrication tool corresponding to the other side of the opening is formed inside the lubrication tool.

According to the compressor according to the present invention as described in detail above, the following effects can be expected.

In the present invention, the lubricating oil that can be stored in the lubricating oil flows into the bottom surface of the shoe in contact with the swash plate is formed to be concave. Accordingly, even when the compressor is stopped for a predetermined time and then restarted, lubricating oil can be supplied quickly between the swash plate and the shoe, thereby reducing friction between the swash plate and the shoe, thereby improving the efficiency of the compressor and improving durability. It works.

Further, in the present invention, the friction surface between the bottom surface of the shoe and the swash plate is reduced due to the lubrication tool, so that the friction force between the two is reduced, and the cooling between the swash plate and the shoe is more efficient.

Hereinafter, preferred embodiments of the compressor according to the present invention will be described in detail with reference to the accompanying drawings. Repeated description of the same construction and operation as in the prior art will be omitted.

3 is a perspective view showing the configuration of the shoe constituting the embodiment of the present invention.

Accordingly, the compressor 1 according to the present invention will be described with reference to the conventional drawings. The skeleton and the appearance of the compressor 1 will be described with respect to the front housing 10, the rear housing 10a, and the front and rear cylinder blocks 20 and 20a. ) Forms. Of course, the skeleton and appearance of the compressor 1 are formed by the front and rear housings 10 and 10a, and the cylinder blocks 20 and 20a may be provided in the internal spaces of the front and rear housings 10 and 10a. These are arranged and coupled in the order of the front housing 10, the front and rear cylinder blocks (20, 20a) and the rear housing (10a), the drive shaft 30 that is rotated by an external drive source through the center of each of them is installed. .

A piston 50 linearly reciprocating in conjunction with the rotation of the drive shaft 30 is installed in the cylinder bore 21 of the front and rear cylinder blocks 20 and 20a, and is compressed in the cylinder bore 21 of the working fluid. Discharge is effected by the valve unit 60.

Hereinafter, the components constituting the compressor 1 will be described in more detail. The front housing 10 has a support hole 25 through which the drive shaft 30 passes through the center in a substantially disk shape.

The suction chamber 11 is recessed in the front housing 10. The suction chamber 11 may be formed over a substantially ring-shaped area so as to selectively communicate with each cylinder bore 21 of the front cylinder block 10 through the valve unit 60.

The rear housing 10a is mounted on one surface of the rear cylinder block 20a, ie, the surface opposite to the surface in close contact with the front cylinder block 20 in the rear cylinder block 20a. The discharge chamber 12 is recessed on a surface of the rear housing 10a that faces the rear cylinder block 20a. The discharge chamber 12 is formed to have a substantially ring-shaped area and selectively communicates with the cylinder bores 21 formed in the rear cylinder block 20a through the valve unit 60.

The front and rear cylinder blocks 20 and 20a are formed to correspond to portions concaved to the surfaces joined to each other to form the swash plate chamber 24. In the swash plate chamber 24, the swash plate 40 installed on the drive shaft 30 is rotatably positioned.

The front and rear cylinder blocks 20 and 20a are formed by passing a plurality of cylindrical cylinder bores 21 through the support holes 25 in the direction of formation of the support holes 25. In this case, the cylinder bore 21 is formed at positions corresponding to the front and rear cylinder blocks 20 and 20a, respectively.

 One end of the drive shaft 30 is installed through the front housing 10. An approximately disc shaped swash plate 40 is inclined with respect to the extending direction of the drive shaft 30 in the drive shaft 30. The center of the swash plate 40 is provided with a hub 44 having a cylindrical shape, the drive shaft 30 penetrates the hub 44.

A plurality of shoes 145 surrounding the edge of the swash plate 40 is installed. The shoe 145 is configured to move along the edge of the swash plate 40, and is positioned between the swash plate 40 and the piston 50 to reduce friction between the two.

As shown in FIG. 3, the shoe 145 is formed in a substantially hemispherical shape, and a circular bottom surface 145 ′ contacts the swash plate 40 and a hemispherical hemispherical surface 145 ″ is below. It is inserted into the shoe seating groove 52 of the piston 50 to be described. That is, the shoe 145 is provided to be rotatable between the swash plate 40 and the piston 50, so that the swash plate 40 and the piston 50 can be smoothly interlocked.

In this case, a lubrication tool 146 is formed in the bottom surface 145 ′ of the shoe 145. The lubrication tool 146 is formed to extend in the radial direction of the bottom surface 145 'in the state opened toward the swash plate 40 on the bottom surface 145' of the shoe 145. This is to allow lubricating oil to flow into the lubrication hole 146 through the opening 147 to be described later. In particular, since the lubrication tool 146 is formed along the radial direction of the bottom surface 145 ', the length of the lubrication tool 146 may be relatively sufficiently secured.

An opening 147 is formed in the lubrication tool 146. The opening 147 is formed to be opened to one side of the hemispherical surface 145 ″, and is a portion into which lubricating oil is introduced.

As shown in FIG. 4, the lubrication tool 146 is formed to deepen from the opening 147 toward the inside thereof. That is, the height H inside the lubrication tool 146 is larger than the height h of the opening 147. This is to allow the lubricating oil to be sufficiently introduced into the lubrication tool 146 and stored therein.

In addition, the lubrication tool 146 is formed so that its width becomes wider from the inside toward the opening 147. That is, the width l of the opening 147 is larger than the width L inside the lubrication tool 146. This is to allow the lubricant to smoothly flow through the opening 147.

The piston 50 is to linearly reciprocate the inside of the cylinder bore (21). The piston 50 has a substantially cylindrical shape corresponding to the inside of the cylinder bore 21, and both ends thereof are located in the cylinder bore 21 of the front and rear cylinder blocks 20 and 20a, respectively. That is, both ends of each of the one piston (50) serves to compress the working fluid in the cylinder bore (21). For reference, when compression occurs in the cylinder bore 21 where one end of one piston 50 is positioned, the suction process is performed in the cylinder bore 21 where the other end is located. The piston 50 has a middle portion thereof coupled with the shoe 145, and thus linearly reciprocates in the cylinder bore 21 according to the rotation of the swash plate 40.

Shoe seating groove 52 is formed in the piston 50. The shoe seating groove 52 is a portion into which the shoe 145 is inserted, and is formed to be recessed in a shape corresponding to the hemispherical surface 145 ″ of the shoe 145.

The valve unit 60 is used to control the discharge of the working fluid compressed in the cylinder bore 21 to the outside of the cylinder bore 21. The valve unit 60 includes a valve plate 62 which is installed in close contact with one surface of the front and rear cylinder blocks 20 and 20a.

6 shows another embodiment of the shoe constituting the compressor according to the present invention in a bottom view. According to this, the lubrication tool 146 is recessed in the bottom 145 ′ of the shoe 145. The lubrication tool 146 is opened to one side of the bottom surface 145 ′ to form an opening 147. The lubrication tool 146 is formed to extend in the radial direction of the bottom surface 145 ′ of the shoe 145.

In this case, an extended portion 147 ′ extending from the width of the lubrication tool 146 is formed at the deepest position of the lubrication tool 146 corresponding to the other side of the opening 147. The expansion portion 147 ′ is a portion extending substantially circularly from the inside of the lubrication hole 146, so that the lubricating oil introduced into the opening 147 may be sufficiently stored in the lubrication hole 146. Of course, the shape of the expansion portion 147 ′ is not necessarily limited to a circular shape, and various modifications are possible as long as the lubricating oil may be sufficiently stored.

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

The working fluid supplied from the evaporator is sucked into the suction part of the muffler 70 and then supplied to the swash plate chamber 24 between the front and rear cylinder blocks 20 and 20a through the refrigerant suction port 71, and the swash plate chamber 24 is provided. Refrigerant supplied to) flows into the suction chamber 11 of the front and rear housings 10 and 10a along the suction passages 22 formed in the front and rear cylinder blocks 20 and 20a.

And, as the drive shaft 30 is rotated by a driving force transmitted from the outside, the swash plate 40 is rotated with the rotation of the drive shaft 30, thereby operating the piston 50. That is, the rotation of the swash plate 40 causes the piston 50 to make a linear reciprocating motion inside the cylinder bore 34.

In this process, the working fluid flowing into the suction chamber 11 is sucked into the cylinder bore 21. More precisely, the working fluid is sucked into the cylinder bore 21 through the valve plate 62 during the suction stroke of the piston 50.

In addition, during the compression stroke of the piston 50, the working fluid compressed in the cylinder bore 21 is compressed. In this case, the working fluid flows into the discharge chamber 12 through the valve plate 62. Finally, the working fluid is discharged to the discharge portion of the muffler through the refrigerant discharge port 72 of the muffler 70.

At this time, the shoe 145 is provided between the swash plate 40 and the piston 50 to smoothly interlock the swash plate 40 and the piston 50. In addition, the lubricating tool 146 formed in the shoe 145 may be maintained in a state in which lubricating oil is introduced, so that the role of the shoe 145 may be more efficiently performed.

That is, the state in which the lubricant is applied must be maintained between the bottom surface 145 'of the shoe 145 and the swash plate 40, and the lubrication tool 146 assists the supply of such lubricant. In particular, when the compressor 1 is restarted after stopping the operation for a predetermined time, the lubricant applied to the bottom 145 'of the shoe 145 dries, or the bottom 145' and the swash plate ( There is a fear of exiting between the 40), since the lubricating oil is stored in the lubrication tool 146, this can be prevented.

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.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a configuration of a compressor according to a prior art; FIG.

Figure 2 is a perspective view showing the configuration of the shoe constituting the compressor according to the prior art.

Figure 3 is a perspective view showing the configuration of a preferred embodiment of the shoe constituting the compressor according to the present invention.

4 is a cross-sectional view taken along line AA ′ of FIG. 3.

Figure 5 is a bottom view showing the configuration of a preferred embodiment of the shoe constituting the compressor according to the present invention.

Figure 6 is a bottom view showing the configuration of another embodiment of the shoe constituting an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: front housing 10a: rear housing

20: front cylinder block 20a: rear cylinder block

21: cylinder bore 22: suction passage

24: swash chamber 30: drive shaft

40: swash plate 50: piston

70: muffler 145: shoe

146: lube opening 147: opening

Claims (3)

Front and rear housings (10, 10a) forming at least both ends of the compressor (1); Front and rear cylinder blocks (20, 20a) positioned between the front and rear housings (10, 10a) and having a plurality of cylinder bores (21) formed therein; A drive shaft (30) installed in the cylinder bore (21), the swash plate (40) being inclined and rotated integrally; A plurality of pistons 50 linearly reciprocating in the cylinder bore 21 according to the rotational motion of the swash plate 40; And, A hemispherical surface 145 ″ provided between the swash plate 40 and the piston 50 and inserted into the bottom surface 145 ′ contacting the swash plate 40 and the shoe seating groove 52 formed in the piston 50. In the compressor comprising a shoe 145 composed of Lubrication holes 146 are formed in the bottom surface 145 ′ of the shoe 145 in contact with the swash plate 40 along the radial direction thereof, and the lubrication holes 146 are opened toward the swash plate 40. And an opening 147 opening to the hemisphere 145 '' is formed , Compressor characterized in that the lubrication port (146) of the shoe (145) is wider from the inside toward the opening (147), and deeper from the opening (147) toward the inside. delete The compressor as set forth in claim 1, wherein an extension part (147 ') is formed inside the lubrication tool (146) corresponding to the other side of the opening part (147) to extend and concave than the width of the lubrication tool (146).

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