JPH10238481A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance reliability, achieve compactness and reduce a cost by using a bearing having an inside face of a steel plate bent into a cylindrical shape which is subjected to a surface reforming treatment capable of retarding fusion to iron and applying high abrasion resistance at a specific temperature or lower. SOLUTION: A thin steel plate is bent into a cylindrical shape, wherein an outside face and an inside face are finished by grinding to predetermined dimensions, thus obtaining a bearing 9. Subsequently, the entire bearing 9 is subjected to a gas nitrocarburizing treatment capable of retarding fusion to iron or an aluminum alloy at 600 deg.C or lower, and then, the inside face is finished smooth by a lap. Finally, the bearing is press-fitted into a housing 8. The resultant bearing is used as a bearing for a drive shaft 3. If the outside and inside faces are finished before a surface treatment, dimensions are set in consideration of a dimensional change during the gas nitrocarburizing treatment in order to obtain characteristics necessary for the bearing. Even though the drive shaft 3 is made of either cast iron or steel, seizure resistance is high even under a boundary lubricating condition since the bearing is subjected to the gas nitrocarburizing treatment. Furthermore, the main material is made of steel, bearing strength is high, thus obtaining the bearing of a small diameter and a small size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing for a scroll compressor used for commercial and domestic refrigeration and air conditioning.

[0002]

2. Description of the Related Art Conventionally, bronze-based materials, aluminum-based materials, and composite materials of metals and resins have been used for bearings of scroll compressors. Similar materials have been used for eccentric bearings and movable scroll bearings.

[0003]

However, in the conventional bearings described above, that is, bearings using a bronze-based material or an aluminum-based material, the bearings in a boundary lubrication environment, which often occurs during a transient state during compressor operation, are provided. Since bearings with low seizure and using a composite material of metal and resin are difficult to have high bearing strength, strengthen the lubrication and increase the diameter and length of the bearing to reduce the bearing load below the bearing strength. It is configured to keep it to a minimum. However, if the oil sump 6 is provided as shown in FIG. 5 in order to enhance lubrication, machining is required, and an inexpensive scroll compressor cannot be obtained. In addition, when the diameter of the bearing is large, a large amount of power is required during operation, and it is difficult to obtain a scroll compressor with high efficiency. In addition, members for holding the bearing are also large, so that the whole needs to be enlarged. . In such a case, the material cost increases, so that it is difficult to obtain an inexpensive scroll compressor. In addition, when the length of the bearing is increased, as shown in FIG. 5, a single contact 13 due to a twist with the shaft is likely to occur, which is suppressed, and the machining and assembling accuracy are improved in order to ensure reliability. And it becomes difficult to obtain an inexpensive scroll compressor.

The present invention has been made to solve the above-mentioned conventional problems, and performs a surface modification treatment that is hardly welded to iron on a surface inside a steel plate bent into a cylindrical shape and has high abrasion resistance at a temperature of 600 ° C. or less. It is an object of the present invention to provide an inexpensive and highly reliable scroll compressor by using a bearing material that has been used.

Another object of the present invention is to solve the above-mentioned problems by using an eccentric bearing material whose main material is a high-strength resin on the inner surface of a steel plate bent into a cylindrical shape. It is an object of the present invention to provide a scroll compressor with high reliability.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a surface modification treatment which hardly adheres to iron on the inner surface of a steel sheet bent into a cylindrical shape and has high abrasion resistance. 60
It is intended to provide a compact, inexpensive and highly reliable scroll compressor by using a bearing performed at 0 degrees or less.

[0007]

According to the first aspect of the present invention, a thin steel plate is bent into a cylindrical shape, and at least an inner surface is treated at a temperature of 600 degrees Celsius or less and welded to iron. It is used as a bearing after difficult surface modification. And because of this, the outermost surface is hardly welded to iron, so that seizure resistance under boundary lubrication conditions is high, and
Since the base material is a steel plate, it is possible to obtain a high-strength bearing, so that the bearing can be made small, and the overall size is small, the material is inexpensive, machining and assembly are easy, and an inexpensive scroll compressor is obtained. Can be done.

According to a second aspect of the present invention, a thin steel plate is bent into a cylindrical shape, and the outer surface and the inner surface thereof are cut or ground by machining, and at least the inner surface is 600 degrees Celsius.
It is used as an eccentric bearing by performing a surface modification that is less than or equal to the temperature and hardly welds to iron or aluminum alloy. And since the outermost surface is hardly welded to iron due to this, seizure resistance under boundary lubrication conditions is high, and a high strength bearing can be obtained because the base material is a steel plate,
There is no lubrication oil reinforcement or other lubrication enhancing structure, and a small bearing can be configured. The overall size is small, the material cost is low, machining and assembly are easy, and an inexpensive scroll compressor can be obtained.

According to a third aspect of the present invention, a thin steel plate is bent into a cylindrical shape, and the outer and inner surfaces thereof are cut or ground by grinding, and at least the inner surface is 600 degrees Celsius.
It is used as an eccentric bearing by performing a gas nitrocarburizing treatment that is less likely to be welded to iron or an aluminum alloy by treating at a temperature of less than or equal to. And because of this, the outermost surface is hardly welded to iron, so that seizure resistance under boundary lubrication conditions is high, and since the base material is a steel plate, a high-strength bearing can be obtained. Therefore, the bearing can be made small, the overall size is small, the material cost is low, machining and assembly are easy, and an inexpensive scroll compressor can be obtained.

According to a fourth aspect of the present invention, a thin steel plate is bent and formed on a cylinder, and an outer surface and an inner surface thereof are cut or ground by machining, and at least an inner surface is 600 degrees Celsius.
It is used as an eccentric bearing by performing a salt bath nitriding treatment that is less likely to be welded to iron or an aluminum alloy by treating at a temperature lower than or equal to. And because of this, the outermost surface is hardly welded to iron, so that seizure resistance under boundary lubrication conditions is high, and since the base material is a steel plate, a high-strength bearing can be obtained. Therefore, the bearing can be made small, the overall size is small, the material cost is low, machining and assembly are easy, and an inexpensive scroll compressor can be obtained.

According to a fifth aspect of the present invention, a thin steel plate is bent and formed into a cylindrical shape, and the outer and inner surfaces thereof are cut or ground by machining, respectively, and then at least the inner surface is 600 degrees Celsius.
It is used as an eccentric bearing by performing a chromium carbonitride diffusion treatment which is less likely to be welded to iron or an aluminum alloy by treating at a temperature of less than or equal to. And because of this, the outermost surface is difficult to weld with iron, so the seizure resistance under boundary lubrication conditions is high,
Also, since the base material is a steel plate, it is possible to obtain a high-strength bearing, so there is no lubrication oil reinforcement or other lubrication strengthening structure.
The bearing can be made small, the overall size is small, the material cost is low, machining and assembly are easy, and an inexpensive scroll compressor can be obtained.

According to a sixth aspect of the present invention, a thin steel plate is bent into a cylindrical shape, and the outer surface and the inner surface are cut or ground by grinding, respectively, and then at least the inner surface is 600 degrees Celsius.
This is used as an eccentric bearing by performing a nitriding treatment that is less likely to be welded to iron or an aluminum alloy by treating at a temperature lower than or equal to a degree. And since the outermost surface is hardly welded to iron due to this, seizure resistance under boundary lubrication conditions is high, and a high strength bearing can be obtained because the base material is a steel plate,
There is no lubrication oil reinforcement or other lubrication enhancing structure, and a small bearing can be configured. The overall size is small, the material cost is low, machining and assembly are easy, and an inexpensive scroll compressor can be obtained.

According to a seventh aspect of the present invention, a thin steel plate is bent into a cylindrical shape, the outer surface thereof is cut or ground, and then at least the inner surface is treated at a temperature of not more than 600 degrees Celsius and welded to iron or aluminum alloy. It is used as an eccentric bearing by performing surface modification that is difficult to perform and finishing the innermost surface smoothly. This makes the outermost surface less likely to adhere to iron and aluminum alloys and the inner surface is smooth, so the seizure resistance under boundary lubrication conditions is particularly high, and the strength is high because the base material is a steel plate. As a result, there is no lubrication oil reinforcement or other lubrication reinforcement structure, and a small bearing can be constructed. A small, inexpensive scroll compressor that is small in size, inexpensive in material cost, and easy to machine and assemble is obtained. I can do it.

According to the present invention, a thin steel plate is bent into a cylindrical shape, the outer surface thereof is cut or ground, and then at least the inner surface is treated at a temperature of not more than 600 degrees Celsius to be welded to iron or aluminum alloy. It is used as an eccentric bearing by performing a gas nitrocarburizing process that is difficult to perform and finishing the innermost surface smoothly. This makes the outermost surface less likely to adhere to iron and aluminum alloys and the inner surface is smooth, so the seizure resistance under boundary lubrication conditions is particularly high, and the strength is high because the base material is a steel plate. As a result, there is no lubrication oil reinforcement or other lubrication reinforcement structure, and a compact bearing can be constructed. A small-sized scroll compressor that is small in size, inexpensive in material cost, and easy to machine and assemble is obtained. I can do it.

According to a ninth aspect of the present invention, a thin steel plate is bent into a cylindrical shape, the outer surface thereof is cut or ground, and then at least the inner surface is treated at a temperature of not more than 600 degrees Celsius to weld with an iron or aluminum alloy. It is used as an eccentric bearing by performing a salt bath nitridation process that is difficult to perform and finishing and machining the innermost surface smoothly. This makes the outermost surface less likely to adhere to iron and aluminum alloys and the inner surface is smooth, so the seizure resistance under boundary lubrication conditions is particularly high, and the strength is high because the base material is a steel plate. As a result, there is no lubrication oil reinforcement or other lubrication reinforcement structure, and a compact bearing can be constructed. A small-sized scroll compressor that is small in size, inexpensive in material cost, and easy to machine and assemble is obtained. I can do it.

According to a tenth aspect of the present invention, a thin steel plate is bent into a cylindrical shape, the outer surface thereof is cut or ground, and then at least the inner surface is treated at a temperature of not more than 600 degrees Celsius and welded to iron or aluminum alloy. It is used as an eccentric bearing by performing a salt bath nitridation process that is difficult to perform and finishing and machining the innermost surface smoothly. This makes the outermost surface less likely to adhere to iron and aluminum alloys and the inner surface is smooth, so the seizure resistance under boundary lubrication conditions is particularly high, and the strength is high because the base material is a steel plate. As a result, there is no lubrication oil reinforcement or other lubrication reinforcement structure, and a compact bearing can be constructed. A small-sized scroll compressor that is small in size, inexpensive in material cost, and easy to machine and assemble is obtained. I can do it.

According to the eleventh aspect of the present invention, a thin steel plate is bent into a cylindrical shape, the outer surface thereof is cut or ground, and then at least the inner surface is treated at a temperature of not more than 600 degrees Celsius to be welded to iron or aluminum alloy. It is used as an eccentric bearing by performing a nitriding treatment that is difficult to perform and finishing the innermost surface smoothly and machining. This makes the outermost surface less likely to adhere to iron and aluminum alloys and the inner surface is smooth, so the seizure resistance under boundary lubrication conditions is particularly high, and the strength is high because the base material is a steel plate. As a result, there is no lubrication oil reinforcement or other lubrication reinforcement structure, and a compact bearing can be constructed. A small-sized scroll compressor that is small in size, inexpensive in material cost, and easy to machine and assemble is obtained. I can do it.

According to a twelfth aspect of the present invention, a member for holding a bearing by bending a thin steel plate into a cylindrical shape, treating at least the inner surface at a temperature of 600 degrees Celsius or less, and modifying the surface so that it is not easily welded to iron or an aluminum alloy. After press-fitting and fixing, the inside surface-modified surface is finish machined and used as an eccentric bearing. This results in a diffusion layer with the property that the inner side is not easily welded to iron or aluminum alloy, so that seizure resistance under boundary lubrication conditions is high, and a high strength bearing is obtained because the base material is a steel plate. As a result, there is no lubrication oil reinforcement or other lubrication reinforcement structure, and a compact bearing can be constructed. An inexpensive scroll compressor that is small in size, has low material costs, and is easy to machine and assemble can be obtained. .

According to a thirteenth aspect of the present invention, a thin steel plate is bent into a cylindrical shape, and at least the inner surface is treated at a temperature of 600 ° C. or less to perform a gas nitrocarburizing treatment that is not easily welded to iron or an aluminum alloy to hold the bearing. After being press-fitted and fixed to the member, the inner modified surface is finish machined and used as an eccentric bearing. This results in a diffusion layer with the property that the inner side is not easily welded to iron or aluminum alloy, so that seizure resistance under boundary lubrication conditions is high, and a high strength bearing is obtained because the base material is a steel plate. As a result, there is no lubrication oil reinforcement or other lubrication reinforcement structure, and a compact bearing can be constructed. An inexpensive scroll compressor that is small in size, has low material costs, and is easy to machine and assemble can be obtained. .

According to a fourteenth aspect of the present invention, a thin steel plate is bent into a cylindrical shape, and at least the inner surface is treated at a temperature of 600 degrees Celsius or less, and a salt bath nitrocarburizing treatment that is not easily welded to iron or an aluminum alloy is performed to hold the bearing. After being press-fitted and fixed to a member to be formed, the inside surface-modified surface is finish machined and used as an eccentric bearing. In addition, this results in a diffusion layer with the property that the inside is not easily welded to iron or aluminum alloy, so that seizure resistance under boundary lubrication conditions is high, and a high strength bearing is obtained because the base material is steel. As a result, there is no lubrication oil reinforcement or other lubrication reinforcement structure, and a compact bearing can be constructed. An inexpensive scroll compressor that is small in size, has low material costs, and is easy to machine and assemble can be obtained. .

According to a fifteenth aspect of the present invention, a thin steel plate is bent into a cylindrical shape, and at least the inner surface is treated at a temperature of not more than 600 degrees Celsius to perform a chromium carbonitride treatment which is not easily welded to iron or an aluminum alloy, thereby holding the bearing. After being press-fitted and fixed to a member to be formed, the inside surface-modified surface is finish machined and used as an eccentric bearing. And because of this, the inside becomes a diffusion layer with the property that it is difficult to weld to iron and aluminum alloy, so the seizure resistance under boundary lubrication conditions is high,
Also, since the base material is a steel plate, it is possible to obtain a high-strength bearing, so there is no lubrication oil reinforcement or other lubrication strengthening structure.
A small-sized bearing can be formed, and an inexpensive scroll compressor which is small in size, inexpensive in material cost, and easy to machine and assemble can be obtained.

According to a sixteenth aspect of the present invention, a thin steel plate is bent into a cylindrical shape, and at least the inner surface thereof is treated at a temperature of 600 degrees Celsius or less to perform a nitriding treatment that is not easily welded to iron or an aluminum alloy. After press-fitting and fixing, the inner modified surface is finished machined and used as an eccentric bearing. This results in a diffusion layer with the property that the inner side is not easily welded to iron or aluminum alloy, so that seizure resistance under boundary lubrication conditions is high, and a high strength bearing is obtained because the base material is a steel plate. As a result, there is no lubrication oil reinforcement or other lubrication reinforcement structure, and a compact bearing can be constructed. An inexpensive scroll compressor that is small in size, has low material costs, and is easy to machine and assemble can be obtained. .

According to a seventeenth aspect of the present invention, a resin material layer mainly composed of engineering plastic is formed on the surface of a thin steel plate, and the resin layer is bent inside into a cylindrical shape with the resin layer inside. The surface was finished machined and used as a bearing. In addition, this bearing can be manufactured in the same process as the winding bush, so that an inexpensive bearing can be obtained, and a bearing having a high surface seizure resistance can be obtained. Therefore, it is possible to obtain an inexpensive scroll compressor which can be simplified in configuration, has low material costs as a whole, and is easy to machine and assemble.

The invention of claim 18 is a method of forming a resin material layer mainly composed of polyetheretherketone on the surface of a thin steel plate, bending the resin layer inside to form a cylindrical shape, and press-fitting the member into a member for supporting a bearing. The inner surface was finish machined and used as a bearing. In addition, this bearing can be manufactured in the same process as the winding bush, so that an inexpensive bearing can be obtained, and a bearing having a high surface seizure resistance can be obtained. Therefore, it is possible to obtain an inexpensive scroll compressor which can be simplified in configuration, has low material costs as a whole, and is easy to machine and assemble.

A nineteenth aspect of the present invention is a member for supporting a bearing by forming a composite layer of a resin and carbon mainly composed of engineering plastic and carbon on the surface of a thin steel plate, bending the composite layer inside to form a cylindrical shape. After press-fitting, the inner surface is finished machined and used as a bearing.
In addition, this bearing can be manufactured in the same process as the winding bush, so that an inexpensive bearing can be obtained, and a bearing having a high surface seizure resistance can be obtained. Therefore, it is possible to obtain an inexpensive scroll compressor which can be simplified in configuration, has low material costs as a whole, and is easy to machine and assemble.

According to a twentieth aspect of the present invention, there is provided a member for supporting a bearing by forming a composite layer of a resin and carbon mainly composed of polyimide and carbon on the surface of a thin steel plate, and bending the composite layer inside to form a cylindrical shape. After press-fitting, the inner surface was finished machined and used as a bearing. In addition, this bearing can be manufactured in the same process as the winding bush, so that an inexpensive bearing can be obtained, and a bearing having a high surface seizure resistance can be obtained. Therefore, it is possible to obtain an inexpensive scroll compressor which can be simplified in configuration, has low material costs as a whole, and is easy to machine and assemble.

According to a twenty-first aspect of the present invention, there is provided a member for supporting a bearing by forming a composite layer of a resin and carbon mainly composed of polyimide and graphite on the surface of a thin steel plate, bending the composite layer inside to form a cylindrical shape. After press-fitting, the inner surface was finished machined and used as a bearing. In addition, this bearing can be manufactured in the same process as the winding bush, so that an inexpensive bearing can be obtained, and a bearing having a high surface seizure resistance can be obtained. Therefore, it is possible to obtain an inexpensive scroll compressor which can be simplified in configuration, has low material costs as a whole, and is easy to machine and assemble.

[0028]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) In FIG. 1, a bearing 9 is formed by bending a thin steel plate into a cylindrical shape and finishing the outer and inner surfaces thereof to predetermined dimensions by grinding machining, and then the whole is 600 degrees Celsius.
A gas nitrocarburizing treatment which is less likely to be welded to iron or aluminum alloys at a temperature lower than that is performed, and the inner surface is smoothly finished by wrapping. When the outside and inside are finished by grinding machining before surface treatment, the amount of dimensional change in gas nitrocarburizing process to obtain the necessary characteristics as a bearing is determined in advance by experiments, and the dimensions are set in consideration of the amount of change. There is a need. In this embodiment, both the inner and outer diameters are 0.012 mm.
The dimensions are set small, and machining, processing and assembly are performed.

According to this embodiment, the drive shaft is made of a cast iron material or a steel material. In either case, the surface of the bearing 9 is subjected to the gas nitrocarburizing treatment. Since the base material is a steel material, the bearing strength is high and a small-diameter, small-sized bearing configuration can be obtained. Therefore, the cost of materials is low, and the machining cost is low because the bearings are small.In addition, the bearings are small, so there is no need to increase the machining accuracy or assembly accuracy of parts to avoid unnecessary contact. Thus, an inexpensive scroll compressor can be obtained.

(Embodiment 2) In FIG. 2, an eccentric bearing 1 is formed by bending a thin steel plate into a cylindrical shape and finishing the outer and inner surfaces thereof to predetermined dimensions by grinding machining.
Gas nitrocarburizing treatment that does not easily adhere to iron or aluminum alloy at a temperature of 00 degrees or less and finishes the inner surface smoothly with wrap, then press-fits into the drive shaft 3 and is used as an eccentric bearing that receives the movable scroll shaft 2 is there. When the outside and inside are finished by grinding machining before surface treatment, the amount of dimensional change in gas nitrocarburizing process to obtain the necessary characteristics as a bearing is determined in advance by experiments, and the dimensions are set in consideration of the amount of change. There is a need. In this embodiment, the inner and outer diameters are set to a small value of 0.015 mm, and machining, processing,
Assembling is in progress. The amount of eccentricity 4 is determined by the position of the pilot hole 5 into which the eccentric bearing 1 is press-fitted, which is formed in the drive shaft 3. Further, a part of the steel plate is dented and used as the oil groove 10 at the time of punching before bending the steel plate.

According to this embodiment, the movable scroll shaft includes a cast iron material and an aluminum alloy. In either case, since the surface of the eccentric bearing 1 is subjected to the gas nitrocarburizing treatment, even in the boundary lubrication condition. Since the seizure resistance is high, the conventional lubricating oil reservoir 6 is unnecessary, and since the base material is a steel material, the bearing strength is high, so that a small-diameter and small-sized bearing configuration can be obtained. Therefore, the material cost is low, the machining of the lubricating oil sump and the oil groove of the eccentric bearing is unnecessary, and the bearing is small, so the machining cost is also low. Since the product can be manufactured without increasing the processing accuracy and the assembly accuracy more than necessary, an inexpensive scroll compressor can be obtained.

(Embodiment 3) In FIG. 3, the eccentric bearing 1 is formed by bending a thin steel plate into a cylindrical shape, and performing a gas nitrocarburizing treatment on the entire body at a temperature of 600 ° C. or less to prevent welding with iron or aluminum alloy. After the press-fitting, the inner surface is finished to a predetermined inner diameter size by grinding machining while giving an eccentricity of 4 and used as a bearing for receiving the movable scroll shaft 2.
Therefore, eccentricity with the pilot hole 5 occurs. When finishing the inside by grinding machining after the surface treatment, the depth of the diffusion layer by the gas nitrocarburizing treatment for obtaining the required characteristics as a bearing must be obtained in advance by experiments and machined within the set dimensions. In this embodiment, 0.030 mm
The machining allowance is set, and processing, machining, and assembly are performed.

According to this embodiment, the movable scroll shaft includes a cast iron material and an aluminum alloy. In either case, the surface of the eccentric bearing 1 is formed of the diffusion layer of the gas nitrocarburizing treatment, so that the boundary is not limited. Even under lubricating conditions, the seizure resistance is high, so that the lubricating oil reservoir 6 is unnecessary, and since the base material is a steel material, the bearing strength is high, so that a small-diameter, compact bearing configuration can be realized. Therefore, the material cost is low, the machining process such as lubricating oil is not required, and the machining cost is low because it is small, and the machining accuracy and assembly accuracy of the parts are increased more than necessary because the bearing is small so as to eliminate the one-side contact. Since the product can be manufactured without any problem, an inexpensive scroll compressor can be obtained.

(Embodiment 4) In FIG. 4, the eccentric bearing 1 is formed by bending a thin steel plate 12 into a cylindrical shape and forming a resin material layer 11 mainly composed of polyether ketone on the inner surface thereof.
After being press-fitted and fixed in an eccentric hole 5 provided in the drive shaft 3, the inner diameter of the bearing is finished to a predetermined size while adjusting the amount of eccentricity 4 to form an eccentric bearing. Therefore, eccentricity with the pilot hole 5 occurs.

According to this embodiment, the movable scroll shaft 2 is made of a cast iron material or an aluminum alloy. In either case, the surface of the eccentric bearing 1 is made of a high-strength resin layer and is resistant even under boundary lubrication conditions. Since the seizure is high, the conventional lubricating oil reservoir 6 is unnecessary, and the bearing strength is high, so that a small-diameter and small-sized bearing configuration can be realized. Therefore, the material cost is low,
There is no need to machine the lubricating oil sump and the oil groove of the eccentric bearing, and the bearings are small, so the machining cost is low. Since the product can be manufactured without raising it more than necessary, an inexpensive scroll compressor can be obtained.

In the above embodiment, the case where the eccentric bearing is press-fitted into the eccentric hole provided at one end of the drive shaft is shown, but the drive shaft side is provided on the other movable scroll with the eccentric shaft. The same effect can be obtained by press-fitting into the hole provided.

[0038]

As is apparent from the above embodiment, according to the first aspect of the present invention, the surface after machining is subjected to a surface treatment such as gas nitrocarburizing at a temperature of 600 ° C. or less to reduce iron and iron. By making welding difficult, a surface having high seizure resistance can be obtained with a small dimensional change that can be managed, and a bearing having high strength can be obtained because the back metal is a steel plate. Accordingly, the bearing of the scroll compressor has high seizure resistance even under boundary lubrication conditions and can be constituted by a small bearing, so that the whole can be designed to be small and an inexpensive scroll compressor can be obtained.

As is apparent from the above embodiment, claim 2
According to the invention described in the above, after finishing the outside and the inside of the bearing by machining, the surface is subjected to a surface treatment at 600 degrees Celsius or less, such as gas nitrocarburizing, so that it is difficult to weld with iron or an aluminum alloy. In addition, a surface having high seizure resistance can be obtained with a small dimensional change that can be controlled, and a bearing having high strength can be obtained because the back metal is a steel plate. By press-fitting and fixing this bearing to the drive shaft, the eccentric bearing of the scroll compressor can be configured with a high seizure resistance and a small bearing even under boundary lubrication conditions. You can get a compressor.

As is apparent from the above embodiment, claim 7
According to the invention described in the above, the outer and inner sides of the bearing are subjected to a surface treatment at a temperature of 600 degrees Celsius or less such as gas nitrocarburizing after finishing by machining, so that the bearing is hardly welded to an iron or aluminum alloy and used as a bearing. By using the inner surface after applying minor processing such as wrapping, a surface with higher seizure resistance can be obtained with a small dimensional change that can be controlled, and a bearing with high strength is obtained because the back metal is a steel plate Can be By press-fitting and fixing this bearing to the drive shaft, the eccentric bearing of the scroll compressor can be configured with a further high anti-seizure property under boundary lubrication conditions and with a small bearing, so that the whole can be designed to be small and inexpensive. A scroll compressor can be obtained.

As is apparent from the above embodiment, claim 1
According to the invention described in Item 2, the bearing formed by bending the steel plate is subjected to a surface treatment at a temperature of 600 ° C. or less such as gas nitrocarburizing to make it less likely to be welded to iron or an aluminum alloy. The inner surface used as a core bearing is finished and used as an eccentric bearing for a scroll compressor.The surface of the bearing is composed of a small-sized bearing with high anti-seizure resistance even under boundary lubrication conditions, due to the diffusion layer of the surface treatment. Therefore, the scroll compressor can be designed to be small in size as a whole, and an inexpensive scroll compressor can be obtained.

As apparent from the above embodiment, claim 1
According to the invention described in 7, the surface in contact with the shaft is made of a resin material mainly composed of an engineering plastic such as polyetherketone, and after being press-fitted into the drive shaft, the inner surface is finished and used as an eccentric bearing. The seizure resistance between the resin and the metal material of the mating shaft is high, so seizure hardly occurs even under boundary lubrication conditions, and the manufacturing of the bush is inexpensive, like a regular wound bush, so it is highly reliable and inexpensive A simple scroll compressor can be obtained.

As is apparent from the above embodiment, claim 1
According to the invention described in Item 9, the surface in contact with the shaft is made of a resin material mainly composed of an engineering plastic such as polyimide and a composite material mainly composed of carbon such as carbon, and the inner surface is pressed into the drive shaft and then pressed. By finishing and using it as an eccentric bearing, seizure hardly occurs even under boundary lubrication conditions due to the high seizure resistance of the resin and the metal material of the mating shaft, and the bush is manufactured in the same way as a normal wound bush Since it is inexpensive, a highly reliable and inexpensive scroll compressor can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a bearing showing one embodiment of the first invention.

FIG. 2 is an exploded perspective view of an eccentric bearing showing one embodiment of the second invention.

FIG. 3 is an exploded perspective view of an eccentric bearing showing a fourth embodiment of the present invention.

FIG. 4 is an exploded perspective view of an eccentric bearing showing one embodiment of the fifth invention.

FIG. 5 is a sectional view of a bearing showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 eccentric bearing 2 movable scroll shaft 3 drive shaft 4 eccentric amount 5 pilot hole 6 lubricating oil reservoir 8 housing 9 bearing 10 oil groove 11 resin material layer 12 thin steel plate 13 one end

Continued on the front page (72) Inventor Nobuyoshi Kojima 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Inventor Takumi Sasa 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (21)

[Claims] 1. A thin steel plate which is bent into a cylindrical shape, and at least the inner surface of which is treated at a temperature of 600 ° C. or less to modify the surface of the steel plate so as not to be easily welded to iron, is used as a bearing. Features scroll compressor. 2. A thin steel plate is bent into a cylindrical shape, and the outer surface and the inner surface thereof are cut or ground by grinding, respectively.
A scroll compressor characterized in that a bearing modified at a temperature of less than 00 degrees and subjected to a surface modification that is hardly welded to an iron or aluminum alloy is used as an eccentric bearing. 3. The scroll compressor according to claim 2, wherein a gas soft nitriding treatment is performed for the surface treatment. 4. The scroll compressor according to claim 2, wherein a salt bath nitrocarburizing treatment is performed for the surface treatment. 5. The scroll compressor according to claim 2, wherein chromium carbonitride diffusion treatment is performed for the surface treatment. 6. The scroll compressor according to claim 2, wherein a nitriding treatment is performed for the surface treatment. 7. A thin steel plate is bent into a cylindrical shape, and the outer and inner surfaces thereof are cut or ground by machining. Then, at least the inner surface of the cylindrical steel plate is treated at a temperature of 600 ° C. or less to obtain iron or steel. A scroll compressor characterized by using a bearing whose surface is hardly welded to an aluminum alloy and whose finished surface is smooth-finished on the side to be used as a bearing, and used as an eccentric bearing. 8. The scroll compressor according to claim 7, wherein a gas nitrocarburizing treatment is performed for the surface treatment. 9. The scroll compressor according to claim 7, wherein a salt bath nitrocarburizing treatment is performed for the surface treatment. 10. The scroll compressor according to claim 7, wherein chromium carbonitride diffusion treatment is performed for the surface treatment. 11. The nitriding treatment is performed for the surface treatment.
The scroll compressor as described. 12. A thin steel plate is bent into a cylindrical shape, and at least the inner surface of the cylindrical steel plate is treated at a temperature of 600 ° C. or more to modify the surface so that it is not easily welded to iron or an aluminum alloy, thereby retaining the bearing. A scroll compressor characterized in that after press-fitting and fixing to a member to be formed, an inner surface modified surface is finish machined and used as an eccentric bearing. 13. The scroll compressor according to claim 12, wherein a gas soft nitriding treatment is performed for the surface treatment. 14. The scroll compressor according to claim 12, wherein a salt bath nitrocarburizing treatment is performed for the surface treatment. 15. The scroll compressor according to claim 12, wherein chromium carbonitride diffusion treatment is performed for the surface treatment. 16. The method according to claim 1, wherein a nitriding treatment is performed for the surface treatment.
2. The scroll compressor according to 2. 17. A resin material mainly composed of engineering plastic is used for a surface in contact with the shaft, and after press-fitting into a member supporting the bearing, the inner surface of the bearing is finish machined to be used as an eccentric bearing. A scroll compressor characterized by the above-mentioned. 18. The scroll compressor according to claim 17, wherein polyetheretherketone is used as the resin. 19. A surface mainly in contact with a shaft is made of engineering plastic and a material mainly composed of carbon, and after being press-fitted into a member for supporting a bearing, an inner surface of the bearing is finish machined to be used as an eccentric bearing. A scroll compressor characterized by: 20. The scroll compressor according to claim 19, wherein polyimide and carbon are used as main materials. 21. The scroll compressor according to claim 19, wherein polyimide and graphite are used as main materials.