KR20040064797A - A Piston Structure and Manufacturing Method of a Compressor for Car Air Conditioning System - Google Patents

Abstract

PURPOSE: A piston structure of a swash plate type compressor for a vehicle air conditioning apparatus, and a method for manufacturing the same are provided to minimize inertia interfering reciprocation of a piston by reducing weight of the piston, thereby increasing the efficiency of compression. CONSTITUTION: A body part(111) is formed of a bridge having a shoe pocket inside, and an extension part(111c) forming one body with the bridge and having a first welded part. A head part(112) is formed in cylindrical shape having one open end, and has a second welded part welded with the first welded part of the body part at a bottom surface inside. A central axis of the welded part coincides with a central axis of a load due to a swash plate and a shoe.

Description

A Piston Structure and Manufacturing Method of a Compressor for Car Air Conditioning System

The present invention relates to a piston of a swash plate type compressor for an automotive air conditioner, and more particularly, to facilitate welding in a piston to which two parts are joined by friction welding, and to ensure a stable sealing structure. A piston structure of a swash plate type compressor and a method of manufacturing the same.

In general, swash plate compressors used in automotive air conditioners are apparatuses used to compress gaseous refrigerant discharged from the evaporator to a low pressure state to a high pressure state which is easy to liquefy and discharge it to a condenser. Inside the swash plate compressor, a piston is provided to compress the refrigerant in the compression chamber of the compressor while reciprocating by the rotation of the swash plate.

For example, the swash plate type compressor C according to the prior art, as shown in Fig. 1, is formed in the front and rear to form a closed space such as the crank chamber 21, the suction chamber 30a, the discharge chamber 30b, etc. Rear housings 20 and 30; A cylinder block 70 having a plurality of cylinder bores (not shown) arranged in the circumferential direction and embedded between the front and rear housings 20 and 30; A drive shaft 40 penetrating the center of the front housing 20 and inserted into the crank chamber 21 and rotatably supported at the center of the cylinder block 70; A plate (50) connected to the drive shaft (40) to rotate in accordance with the rotation of the drive shaft (40) in the crank chamber (21); Swash plate is installed around the drive shaft 40, is connected to the plate 50 and rotated in accordance with the rotation of the plate 50, the sliding plate is slid in the axial direction of the drive shaft 40 to vary the inclination angle (Swash Plate) 60; A plurality of pistons (10) coupled to the shoe (62) provided along the circumference of the swash plate (60) and reciprocating in each bore of the cylinder block (70) in accordance with the rotation of the swash plate (60); A valve unit (not shown) provided between the cylinder block (70) and the rear housing (30); A control valve (90) for adjusting the feeding amount of the piston (10); The spring 50 is elastically installed between the plate 50 and the swash plate 60 to support the swash plate 60 at the minimum inclination angle when the plate 50 is not rotated.

In the swash plate compressor C, when the drive shaft 40 is rotated by the power of an engine, the plate 50 and the swash plate 60 connected to the plate 50 rotate to rotate the plurality of pistons 10. ) Is reciprocated in each bore in proportion to the inclination angle of the swash plate 60, while the refrigerant in the suction chamber 30a is moved while the piston 10 moves backward to the crank chamber 21 side. Refrigerant introduced into the plurality of bores, the refrigerant introduced into each bore while the piston 10 is advanced is compressed and discharged to the discharge chamber (30b) at a high pressure and then discharged to the condenser through the refrigerant passage It is.

In the prior art swash plate type compressor (C), the structure of the piston 10, as shown in Fig. 2 (a), a shoe pocket (Shoe Pocket) on which a shoe connecting the piston and the swash plate is seated inside Body part 11 which consists of bridge 11b with which 11a was provided, and the 1st extension part 11c provided in the longitudinal direction at one side of the bridge 11b, and the 1st of the body part 11, and It is composed of a head portion 12 having a second extension portion 12a formed in the longitudinal direction so as to be joined to the extension portion 11c, or as shown in Fig. 2 (b), the shoe pocket ( A body portion 11 comprising a bridge 11b provided with 11a) and a first extension portion 11c provided in the longitudinal direction, and a second extension portion provided in the longitudinal direction toward the body portion 11. It is common to consist of the head part 12 provided with 12a.

Hollow piston 10 of the structure as described above has the advantage that can reduce the weight compared to the integral piston, and after molding the body portion 11 and the head portion 12 separately, these are machined After processing and temporarily coupling, the welded portion S of the body portion 11 and the head portion 12 is manufactured by electron beam welding or friction welding.

When the hollow piston having the above structure is manufactured by electron beam welding, the welding portion S having a small cross section must be precisely processed, the welding time is relatively long, and the processing procedure after welding and welding is complicated and complicated. As well as greatly reduced productivity, there was a problem that the failure rate is increased.

In addition, as the fine holes are generated in the structure of the piston 10 in the electron beam welding process, the durability of the piston decreases, and the coolant and the oil penetrate into the hollow part G through the fine holes so that the coolant and oil are insufficient. Exposed problems.

On the other hand, even when the hollow piston of the above structure is manufactured by friction welding, there has been a problem that welding is difficult because the circumferential joining must be made. In addition, there is a problem in welding strength due to the small cross-sectional area of the bonded portion, and because the friction welding site must be on the compression surface side, there is a problem such as using a three-axis forged material to increase the manufacturing cost .

Accordingly, the present invention has been made in order to solve the problems described above, the piston structure to facilitate the welding by increasing the welding surface to be friction-welded and improve the strength of the welding and easy to inspect the weld site and It is an object to provide a method of manufacturing the same.

In addition, another object of the present invention is to provide a piston structure that has a low manufacturing cost and secures a stable sealing structure so as not to impart a cylinder bore.

1 is a schematic cross-sectional view of a swash plate compressor employing a piston according to the prior art,

Figure 2 is a view showing a piston according to the prior art, (a) is a cross-sectional view showing a state in which the extended portion of the body is formed welded, (b) is a state in which the extension of the body portion is formed short welded. Section,

3 is a schematic cross-sectional view of a swash plate compressor employing a piston according to the present invention,

Figure 4 is a view showing a piston according to a first embodiment of the present invention, (a) is a separate cross-sectional view showing a state before welding, (b) is a combined cross-sectional view showing a state after welding,

Figure 5 is a cross-sectional view taken along the line A-A according to Figure 4 (a), (a) is a cross, (b) is a circular, (c) is a cross-sectional view of the extension of the hollow shape,

Figure 6 is a view showing a piston according to a second embodiment of the present invention, (a) is a separate cross-sectional view showing a state before welding, (b) is a combined cross-sectional view showing a state after welding,

7 is a view showing a state in which the extension portion of the piston according to Figure 6 is formed in a hollow shape, (a) is a separate cross-sectional view showing a state before welding, (b) a combined cross-sectional view showing a state after welding. to be.

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

100,200 ... piston 111,211 ... body

111a, 211a ... Shoe pocket 111b, 211b ... bridge

111c ... Extension 211c ... 1 Extension

112,212 ... head 212a ... second extension

S1 ... weld 1 S2 ... weld 2

In order to solve the above technical problem, the piston structure of the swash plate compressor for automobile air conditioner of the present invention comprises a bridge provided with a shoe pocket on the inside, and the bridge forms one body with the bridge. A body portion comprising an extension of a circular cross section provided with a first welding portion; A cylindrical shape having one side open and a head portion having a second welding portion joined to the first welding portion of the body portion on an inner bottom thereof, wherein the central axis of the welding portion coincides with the central axis of the load by the swash plate and the shoe; do.

In addition, the extension portion is characterized in that it is molded in a flat ellipse shape with a cruciform shape or an open center.

In addition, the piston structure of the compressor of the present invention, the bridge is provided with a shoe pocket (Shoe Pocket) in the inner side and the first extension portion of the circular cross section that forms a body with the bridge and the first welding portion (S1) at one end is provided. A body portion; And a head part including a second extension part having a second welding part at one end thereof in a shape corresponding to the first welding part of the body part.

The first extension part and the second extension part of the head part are hollow.

On the other hand, the piston manufacturing method of the swash plate compressor for automobile air conditioner of the present invention, the bridge is provided with a shoe pocket (Shoe Pocket) on the inside, and an extension part which forms a body and the first welding portion at one end with the bridge; Forming a body portion; Molding a head part having a second open part formed on one side of an open cylindrical shape and joined to a first weld part of the body part on an inner bottom thereof; And relatively rotating the first welding portion of the body portion and the second welding portion of the head portion to each other and joining them by the heat generated thereby to form a piston.

In addition, the piston manufacturing method of the compressor of the present invention, the step of forming a body portion consisting of a bridge having a shoe pocket (Shoe Pocket) on the inside and a first extension portion forming a body and the first welding portion at one end Wow; Forming a head part including a second extension part having a second welding part at one end thereof in a shape corresponding to the first welding part of the body part; Relatively rotating the first welded portion of the body portion and the second welded portion of the head portion against each other and joining them by the heat generated thereby to form a piston semifinished product; And cutting the outer circumferential surface of the semifinished piston product to remove the raised portion generated during the friction welding.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a schematic cross-sectional view of a swash plate compressor employing a piston according to the present invention, Figure 4 is a view showing a piston according to a first embodiment of the present invention, (a) shows a state before welding Separated cross-sectional view, (b) is a combined cross-sectional view showing a state after welding, Figure 5 is a view showing the shape of the extension of the piston according to Figure 4, (a) is a cross, (b) is a circular, (c) is a sectional view of the hollow-shaped extension, Figure 6 is a view showing a piston according to a second embodiment of the present invention, (a) is a separate cross-sectional view showing a state before welding, (b ) Is a cross-sectional view showing a state after welding, Figure 7 is a view showing a state in which the extension of the piston according to Figure 6 formed in a hollow shape, (a) is a separate cross-sectional view showing a state before welding, (b) is a combined sectional view which shows the state after welding.

First, among the technical components of the swash plate compressor (C) for the automotive air conditioner of the present invention, the front and rear housings 120 and 130 forming the crank chamber 121, the suction chamber 130a, the discharge chamber 130b, and the like. )and; A cylinder block 170 having a plurality of bores (not shown) and embedded between the front and rear housings 120 and 130; A drive shaft 140 rotatably supported by the cylinder block 170; A plate 150 connected to the drive shaft 140; A swash plate 160 which is slidably moved in the axial direction of the drive shaft 140 and whose inclination angle is variable; A valve unit (not shown) provided between the cylinder block 170 and the rear housing 130; A control valve 190 for adjusting a feed amount of the piston 100; Since the spring 180 supporting the swash plate 160 has been described in the related art, a detailed description thereof will be omitted. However, the swash plate 160 may be combined with a shoe 162 provided along the circumference of the swash plate 160. It is noted that there is a difference only in the shape and manufacturing method of the plurality of pistons 100 reciprocating in each bore of the cylinder block 170 in accordance with the rotation of.

That is, according to the structure of the piston 100 of the compressor (C) according to the first embodiment of the present invention, as shown in Figures 3 to 5, and the bridge (111b) provided with a shoe pocket (111a) inside A body part 111 formed of an extension part 111c that forms a body with the bridge 111b and has a first welding part S1 at one end thereof; One side of the cylindrical opening has a head portion 112 formed with a second welding portion (S2) is joined to the first welding portion (S1) of the body portion 111 on the inner bottom surface, the central axis of the welding portion is a swash plate And the central axis of the load by the shoe.

Here, it is preferable that the first welding part S1 formed at one end of the extension part 111c of the body part 111 corresponds to the size of the second welding part S2 of the head part 112. According to the present invention, when the first welding portion S1 and the second welding portion S2 are subjected to friction welding, the welding surface is wide, so that the welding can be easily performed, and the strength of the welded portion can be improved as well as inspection after welding. It will also be easy. In addition, the extension is performed by reducing the force applied to the extension part 111c and the head part 112 by matching the central axis of the first and second welding parts S1 and S2 with the central axis of the load by the swash plate and the shoe. It is possible to minimize the cross-sectional area of the portion (111c). Since the friction welding uses a conventional friction welding, a detailed description of the friction welding apparatus will be omitted.

In addition, the extension portion 111c is characterized in that it is formed to form a substantially cross-shaped, circular or hollow with an open central portion. The extension part 111c may reduce the weight of the piston 100, and may be manufactured in various forms because it may be connected to the body part 111 and the head part 112 safely.

On the other hand, the piston 100 manufacturing method of the compressor (C) according to the first embodiment of the present invention forms a body with the bridge (111b) and the bridge (111b) is provided with a shoe pocket (111a) inside Forming a body portion (111) formed of an extension portion (111c) having a first welding portion (S1) at one end thereof; Molding a head part 112 having a second weld part S2 formed on one of the cylindrical parts having an open side and joined to the first weld part S1 of the body part 111 on an inner bottom thereof; And relatively rotating the first welding portion S1 of the body portion 111 and the second welding portion S2 of the head portion 112 while facing each other and joining them by heat generated thereby to form a piston. Characterized in that.

In the forming step of the body portion 111 and the head portion 112, the body portion 111 and the head portion 112 is molded with a margin of cutting in a later process by a forging or casting process. . The body 111 and the head 112 is preferably made of an aluminum alloy material.

In the bonding step of the first welding portion S1 of the body portion 111 and the second welding portion S2 of the head portion 112, the head portion 112 is rotated while the body portion 111 is rotated. Presses toward the body portion 111 to weld the first welding portion S1 and the second welding portion S2 corresponding to each other by the frictional heat generated thereby. On the other hand, while rotating the head portion 112 may be welded by the frictional heat generated by pressing the body portion 111 toward the head portion 112 side. In addition, by relatively rotating the body portion 111 and the head portion 112 to each other, the first welding portion (S1) and the second welding portion (S2) can be welded by the frictional heat generated thereby. It is preferable that the above-mentioned friction welding step is performed in the atmospheric atmosphere of normal temperature.

On the other hand, according to the piston structure of the compressor according to the second embodiment of the present invention, as shown in Figure 6 (a) (b) and 7 (a) (b), the shoe pocket 211a is provided on the inside A body portion 211 that forms a body with the bridge 211b and the bridge 211b, and includes a first extension portion 211c having a first welding portion S1 at one end thereof; And a head portion 212 formed of a second extension portion 211c having a second welding portion S2 at one end thereof in a shape corresponding to that of the first welding portion S1 of the body portion 211. .

Here, the first extension portion 211c and the second extension portion 211c provided at one side of the body portion 211 and the head portion 212 are formed in the same cross-sectional area so as to be joined through a normal friction welding. .

The first extension part of the body part 211 and the second extension part of the head part 212 are approximately cross-shaped and circular or hollow (G) shape as shown in Fig. 7 (a) (b). It is characterized by. The first extension portion 211c and the second extension portion 211c may reduce the weight of the piston 200 as in the first embodiment of the present invention, and the body portion 211 and the head portion It can be manufactured in various forms as long as it can safely connect the 212 to maintain the appropriate strength.

On the other hand, the piston 200 of the method for manufacturing a swash plate compressor (C) for a vehicle air conditioner according to a second embodiment of the present invention, the bridge (211b) and the bridge (211b) is provided with a shoe pocket (211a) inside And forming a body part 211 formed of a first body part 211c having one body and having a first welding part S1 at one end thereof; Forming a head part 212 formed of a second extension part 211c having a second welding part S2 at one end thereof in a shape corresponding to the first welding part S1 of the body part 211; Relatively rotating the first welding portion S1 of the body portion 211 and the second welding portion S2 of the head portion 212 while facing each other and joining them by heat generated thereby to form a semi-finished piston product; and ; And cutting the outer circumferential surface of the semifinished piston product to remove the raised portion generated during the friction welding.

Here, the manufacturing method of the piston 200 of the swash plate compressor (C) for a vehicle air conditioner according to the second embodiment of the present invention is almost similar to the manufacturing method according to the first embodiment of the present invention described above, It will be omitted, it is noted that there is a difference only in the step of forming the body portion 211 and the head portion 212.

That is, in the forming of the body portion 211 and the head portion 212, the body portion 211, the bridge (211b) and the bridge (211b) is provided with a shoe pocket 211a on the inside And a first extension part 211c having a body and having a first welding part S1 at one end thereof. The head portion 212 is formed of a second extension portion 211c having a second welding portion S2 at one end thereof in a shape corresponding to that of the first welding portion S1 of the body portion 211. The body portion 211 and the head portion 212 is preferably formed by forging or casting an aluminum alloy material.

In the welding of the body part 211 and the head part 212, the first welding part S1 of the body part 211 and the second welding part of the head part 212 are rotated while facing each other. The welding is caused by the frictional heat generated thereby. At this time, the friction welding method may be the same as the method of the first embodiment of the present invention described above.

As described above, according to the piston structure and the manufacturing method of the swash plate compressor for an automobile air conditioner according to the present invention, the piston is relatively lightweight, thereby minimizing the inertia that hinders the reciprocating motion of the piston, thereby increasing the compression efficiency.

Further, another effect of the present invention is to widen the friction welding site to facilitate welding, to improve the strength of the welding site, and to facilitate the inspection of the welding site.

In addition, according to the present invention, it is possible to reduce the manufacturing cost of the piston and to ensure a stable sealing structure to produce a piston that does not burden the cylinder bore.

Claims (5)

In the piston 100 of the swash plate compressor (C) for automobile air conditioning apparatus, A body portion 111 formed of a bridge 111b provided with a shoe pocket 111a at an inner side thereof, and an extension portion 111c having a first welded portion S1 at one end thereof, forming a body with the bridge 111b; ; A head part 112 having a second open part S2 joined to a first weld part S1 of the body part 111 on a cylindrical bottom having one side opened; Piston structure of the swash plate compressor for a vehicle air conditioner comprising a. In the piston 200 of the swash plate compressor (C) for automobile air conditioning apparatus, Body part consisting of a bridge 211b having a shoe pocket 211a inside and a first extension part 211c of a circular cross section having a body with the bridge 211b and having a first welding part S1 at one end thereof. 211; An automobile comprising a head portion 212 formed of a second extension portion 211c having a second welding portion S2 at one end thereof in the same section as the first welding portion S1 of the body portion 211. Piston structure of swash plate compressor for air conditioning system. The method of claim 2, The piston structure of the swash plate compressor for a vehicle air conditioner, characterized in that the first extension portion (211c) and the second extension portion (211c) of the body portion 211 is made of a hollow type. In the piston 100 of the swash plate compressor (C) for automobile air conditioning apparatus, The body part 111 which consists of the bridge 111b provided with the shoe pocket 111a inside, and the extension part 111c which forms one body with the said bridge 111b, and is provided with the 1st welding part S1 at one end. Forming; Molding a head part 112 having a second weld part S2 formed on one of the cylindrical parts having an open side and joined to the first weld part S1 of the body part 111 on an inner bottom thereof; Relatively rotating the first welding portion S1 of the body portion 111 and the second welding portion S2 of the head portion 112 while facing each other, and joining them by heat generated thereby to form a piston; Method for producing a piston of the swash plate compressor for a vehicle air conditioner comprising a. In the piston 200 of the swash plate compressor (C) for automobile air conditioning apparatus, Body part 211 which consists of the bridge 211b with shoe pocket 211a in the inside, and the 1st extension part 211c which forms one body with the said bridge 211b, and is provided with the 1st welding part S1 at one end. Shaping; Forming a head portion 212 formed of a second extension portion 211c having a second welding portion S2 at one end thereof in the same section as the first welding portion S1 of the body portion 211; Relatively rotating the first welding portion S1 of the body portion 211 and the second welding portion S2 of the head portion 212 while facing each other and joining them by heat generated thereby to form a semi-finished piston product; and ; Cutting the outer circumferential surface of the semifinished piston product to remove the raised portion generated during the friction welding; Method for producing a piston of the swash plate compressor for automobile air conditioning apparatus comprising a.