KR100751613B1 - Manufacturing method of piston for swash plate compressor - Google Patents

Abstract

In constructing a method for manufacturing a piston for a swash plate compressor according to the present invention, the head 111 and the movable part 113 are formed of a synthetic resin capable of heat resistance, abrasion resistance, and high lubrication, and the upper part of the head 111 is formed. The hollow part 115 is formed inside the head 111 to be opened, and the injection process of injection molding the cap 117 covering the hollow part 115, and a cap ( 117 is attached and the process of smoothly finishing the surface of the piston 100 with the cap 117 enables improvement in productivity and low production cost, and the head 111 and the movable portion. 113 is formed in parallel to the straight line can be easily inserted into the cylinder, the wear phenomenon of the swash plate and shoe is prevented, and the swash plate compressor piston 100 that does not generate pulsation noise can be realized.

Swash plate compressor, swash plate, shoe, aluminum, polyphthalamide (PPA), glass fiber bar (GF), carbon fiber bar (CF), polytetrafluoroethylene (PTFE)

Description

Method for producing piston for swash plate compressor {Method for producing of piston for swash plate type compressor}

1 is a cross-sectional view showing a typical swash plate compressor

Figure 2 is a process diagram showing the manufacturing process of the piston for the swash plate compressor applied to the prior art

Figure 3 is a process diagram showing the manufacturing process of the piston for swash plate compressor to which the technique of the present invention is applied

Figure 4 is a cross-sectional view showing that a cutout is formed on one side of the head filled with the piston for the swash plate compressor formed by another embodiment of the present invention

* Description of the symbols used in the main parts of the drawings *

100: swash plate compressor piston

111: head

113: movable part

115: hollow part

117: cap

120: incision

The present invention relates to a method for manufacturing a piston for a swash plate compressor, and more particularly, to a material of heat resistant, abrasion, and high lubricating synthetic resin, and to simplify the manufacturing process, the weight can be reduced, and the production cost can be reduced. A method for producing a piston for a compressor.

1 is a cross-sectional view showing a typical swash plate type compressor, and FIG. 2 will be described together with a process diagram showing a manufacturing process of a piston for a swash plate type compressor to which a conventional technique is applied.

At present, in a vehicle air conditioning system, a compressor for circulating a refrigerant is developing from a fixed compressor to a variable displacement compressor, and the swash plate compressor (1) of the variable displacement compressor has become common.

Looking at the configuration of the swash plate compressor (1), a shaft (5) is provided on the central axis of the housing (3) and rotated by driving power transmitted from the outside to a belt or the like, and the shaft (5) The disk-shaped swash plate 7 is fixedly inclined.

In addition, a plurality of cylinders 9 are disposed and disposed radially in one inner wall portion of the housing 3, and a swash plate compressor piston 10 (hereinafter abbreviated as piston) is inserted into the cylinder 9.

The piston 10 includes a cylindrical head 11 inserted into a cylinder 9 and a movable part 17 having a receiving space 18 in which a swash plate 7 is interposed between the head 11 and the rear of the head 11. It is composed of

When the shaft 5 is rotated by the above configuration, the swash plate 7 is also rotated, and the hemispherical shoe 20 is moved by the swing distance in the direction of the shaft 5 generated by the inclination angle formed by the swash plate 7. By rotating while interposing, the piston 10 reciprocates in the cylinder 9 in a predetermined stroke.

In the conventional swash plate type compressor 1, when the weight of the piston 10 is heavy, a load is applied to the rotation of the swash plate 7 by the inertial force, so that the reciprocation of the piston 10 is not performed quickly, Fuel is consumed a lot and the efficiency of the air conditioning system is reduced.

In addition, the inertial force of the piston 10 causes a pulsation phenomenon when the swash plate 7 rotates, causing a pulsation noise.

To compensate for this, it is necessary to reduce the weight of the piston 10, and look at the manufacturing method of the conventional piston 10 to achieve this purpose is as follows.

The process of shaping the head 11 and the movable part 17 in which the hollow part 13 is formed inside with aluminum as a die, respectively, and reprocessing the molded head 11 and the movable part 17 to a desired dimension. And after joining the head 11 and the movable part 17, the joining process of laser welding the matching part 19 in a high vacuum chamber, and the process of smoothing the surface by grinding the protruding welding part; The process of coating polytetrafluoroethylene (PTFE) to the surface to secure the lubricity of the piston 10 and the process of curing the surface of the coated piston 10 and the surface of the hardened piston 10 Finished with a polishing process for easy lubrication.

According to the conventional technology, the production is delayed due to the large number of processes and complexity, and the productivity is low, and a high vacuum chamber and a laser welding machine are required, which requires a lot of production cost. Torsion and bending occur at the head), and the movable part 17 is combined with the head 11 on which the hollow part 13 is formed in forming the hollow part 13, thereby the head 11 and the movable part 17. In many cases, the joints were not inserted in a straight line and were not properly inserted into the cylinder 9 in many cases.

In addition, even if the inside is processed into a hollow by using aluminum as a material, not only does the phenomenon that the swash plate 7 and the shoe 20 wear due to the load of the shoe 20 due to the weight of the aluminum occurs, and the piston 10 The pulsation noise by the inertia force is still true.

Accordingly, in the present invention, by improving the material with a synthetic resin and simplifying the manufacturing process, it is possible to improve the productivity and low cost of manufacturing, and to process the hollow inside, the head and the movable part are integrally formed, and then the opening is formed on the head. By forming and closing the cap, the head and the moving part are formed in parallel in a straight line so that it can be easily inserted into the cylinder. It is an object of the present invention to provide a method for manufacturing a piston for a swash plate compressor that does not generate pulsation noise due to the inertial force of the engine.

Hereinafter, with reference to the accompanying drawings, look at the process, embodiments and effects of the present invention for achieving the above object.

Figure 3 is a process chart showing the manufacturing process of the piston for swash plate compressor to which the technique of the present invention is applied, Figure 4 is a swash plate compressor piston formed by another embodiment of the present invention is cut in one side of the head filled inside It demonstrates together as sectional drawing which showed the addition.

In general, a swash plate piston (100, hereinafter, abbreviated as a piston) is accommodated in which a swash plate is interposed in a cylindrical head 111 inserted into a cylinder to reciprocate and behind the head 111 (the opposite side of the cylinder). Comprising a movable portion 113 is formed with a space portion 114, the piston 100 is formed of a hollow portion 115 in the interior of the head 111 to enable light weight.

In the present invention, in manufacturing the piston 100, as well as improving the material and simplify the manufacturing process, it is characterized in that the method for forming the hollow portion 115 is improved.

To this end, the production method of the piston for swash plate compressor according to the present invention is configured as follows.

The heat resistance, abrasion resistance, high lubricity is a synthetic resin that is molded so that the head 111 and the movable portion 113 are integrated, but the hollow portion 115 is formed inside the head 111 to open the upper portion of the head 111, An injection process of injection molding the cap 117 covering the hollow part 115, a process of attaching the cap 117 to the open upper portion of the head 111, and a piston with the cap 117 attached thereto It is completed by the process of smoothly finishing the surface of (100).
The synthetic resin is 55% polyphthalamide (PPA) having a heat resistance and high lubrication coefficient and thermal expansion coefficient so that lubrication can be improved by lowering heat resistance, abrasion resistance, and friction coefficient due to friction with the inner wall of the cylinder. 15% of low glass fiber (GF) or carbon fiber (CF) 30% and polytetrafluoroethylene (PTFE) for improving abrasion resistance and lubricity are mixed and used as an injection material of the piston 100.

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In order to attach the cap 117 to the open upper portion of the head 111, by the ultrasonic fusion method, the twist and bending due to thermal deformation are prevented.

As another embodiment of the injection process to enable the weight reduction of the piston 100 in the process to be filled in the interior of the head 111, by molding to form a cut-out portion 120 on one side, it is possible to reduce the weight It is also possible to form a piston 100 filled therein.

According to the present invention, by simplifying the manufacturing process, it is possible to produce quickly, thereby improving the productivity, and it is possible to produce a low cost by eliminating the need for a high vacuum chamber or a laser welding machine.

In addition, in order to reduce the weight, the head 111 and the movable portion 113 are integrally formed by integrally molding the head 111 and the movable portion 113 so that the head 111 and the movable portion 113 are formed in parallel and easily reciprocate in the cylinder. Possible matters can be made by forming the hollow portion 115 in the head 111 to open the upper portion, or by forming the cutout 120 on one side of the head 111 filled inside.

In addition, by replacing the material with a synthetic resin, it is possible to be lighter than conventional aluminum, it is possible to reduce the weight of 44%, the load is not applied to the swash plate and shoe to prevent the wear phenomenon of the swash plate and shoe, and also the piston 100 There is an advantage that the pulsation noise due to the inertial force does not occur.

According to the present invention as described above, by improving the material to a synthetic resin and simplifying the manufacturing process, it is possible to improve the productivity and low production cost, and in the hollow processing inside, after forming the head and the moving unit integrally, the head By forming an opening in the upper part and closing it with a cap, or by forming a cutout at one side of the head filled with the inside, the head and the moving part are formed in parallel in a straight line so that they can be easily inserted into a cylinder. It is possible to realize the piston for the swash plate type compressor, in which the swash plate and the shoe are not worn because the load and the shoe are not loaded, and the pulsation noise is not generated due to the inertial force of the piston.

Claims (4)

In constructing a method for manufacturing a piston for a swash plate compressor, The head 111 and the movable part 113 are molded to be integrated with a synthetic resin, but the hollow part 115 is formed inside the head 111 so that the upper part of the head 111 is opened, and covers the hollow part 115. An injection process of injection molding the cap 117, Attaching the cap 117 to the open upper portion of the head 111; And a process of smoothly finishing the surface of the piston 100 to which the cap 117 is attached, The synthetic resin is 55% polyphthalamide (PPA), 30% glass fiber bar (GF) or 30% carbon fiber bar (CF), Method for producing a swash plate compressor piston made by mixing 15% polytetrafluoroethylene (PTFE). delete delete The method of claim 1, Piston for swash plate type compressor, characterized in that the injection portion (100) is injected to form a cut-out portion 120 on one side of the head 111 formed to be filled in the injection process, so as to be lightweight in the injection process How to make.

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