JP2009084632A - Sliding member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding member in which adhesion between a resin and a sintered base material can be further improved. <P>SOLUTION: The sliding member is provided with: a sintered base material; and a resin composition applied to the surface of the sintered base material. The sintered base material is produced by sintering the metal powder of iron or the like in which at least the surface part is produced by reducing mill scale. Further, the resin composition covers the surface of the sintered base material. Further, the sliding member is applicable as the sliding component of a bearing in a scroll type high-low pressure dome type compressor 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sliding member.

  Conventionally, there is a sliding member in which a surface of an iron-based substrate is coated with a fluororesin having excellent wear resistance and low friction. However, in this sliding member, it may be difficult for the base material to hold the resin on the surface. Therefore, it is desired to improve the adhesion between the resin and the substrate in the sliding member.

Therefore, a sliding member is proposed in which a sintered base having a large number of pores on the surface is coated with a fluororesin (see Patent Document 1). In this sliding member, the fluororesin penetrates into pores near the surface layer of the sintered base material. For this reason, the adhesion between the resin and the sintered base material is improved.
Japanese Patent Publication No. 04-034601

  The subject of this invention is providing the sliding member which can further improve the adhesiveness of resin and a sintering base material.

  The sliding member which concerns on 1st invention is equipped with the sintered base material and the resin film. The sintered base is formed by sintering porous powder at least on the surface. Further, the resin film covers the sintered base material.

  In the sliding member according to the first invention, a sintered body obtained by sintering porous powder is used at least on the surface portion of the sintered base material. For this reason, in this sliding member, the effect which hold | maintains resin on the surface of a sintering base material can be improved.

  Thereby, the adhesiveness between the resin and the sintered base material can be further improved.

  The sliding member according to the second invention is the sliding member of the first invention, and the porous powder is a powder produced by reducing a mill scale. The powder produced by reducing the mill scale is characterized in that pores exist inside the particles and the irregularities on the particle surface are remarkable. For this reason, the effect of holding the resin on the surface of the sintered base can be improved.

  Thereby, the adhesiveness between the resin and the sintered base material can be improved.

  The sliding member according to the third invention is the sliding member of the first invention or the second invention, and the resin film is made of polyamideimide, polyetheretherketone, polyamide, polyethylene terephthalate, polyetherimide, polyimide, polyphenylene. It is at least one thermosetting resin selected from the group consisting of sulfide, phenol resin and polyacrylate. For this reason, this resin film is excellent in wear resistance and low friction.

  A sliding member according to a fourth invention is any one of the first to third inventions, and the resin coating contains a solid lubricant. The solid lubricant is selected from the group consisting of polyethylene terephthalate (PTFE), ethylene tetrafluoroethylene (ETFE), tetrafluoroethylene hexafluoropropylene copolymer (FEP), graphite, tungsten disulfide and molybdenum disulfide. At least one.

The sliding member according to a fifth aspect is the sliding member according to any one of the first to fourth aspects, wherein the resin coating contains an abrasion resistance imparting material. The wear resistance imparting material is selected from the group consisting of calcium fluoride (CaF ₂ ), strontium fluoride (SrFs), magnesium fluoride (MgF ₂ ), alumina (Al ₂ O ₃ ), zinc oxide (ZnO ₂ ), and mica. At least one selected.

  In the sliding member according to the first invention, the adhesion between the resin and the sintered base material can be further improved.

  In the sliding member according to the second invention, the adhesion between the resin and the sintered base material can be improved.

  In the sliding member according to the third invention, the resin film is excellent in wear resistance and low friction.

  In the sliding member according to the fourth invention, a group consisting of polyethylene terephthalate (PTFE), ethylene tetrafluoroethylene (ETFE), tetrafluoroethylene hexafluoropropylene copolymer (FEP), graphite, tungsten disulfide and molybdenum disulfide. At least one selected from the above can be used as the solid lubricant.

In the sliding member according to the fifth invention, calcium fluoride (CaF ₂ ), strontium fluoride (SrFs), magnesium fluoride (MgF ₂ ), alumina (Al ₂ O ₃ ), zinc oxide (ZnO ₂ ) and mica At least one selected from the group can be used as the wear resistance imparting material.

  The sliding member according to the embodiment of the present invention will be described below. This sliding member can be applied as a sliding part such as a bearing of a scroll compressor (for example, the high-low pressure dome type compressor of FIG. 1), more specifically, a bearing metal that contacts the shaft of the bearing.

<Configuration of sliding member>
The sliding member includes a sintered base material and a resin composition coated on the surface of the sintered base material.

  The sintered base material is manufactured by sintering metal powder such as iron manufactured by reducing the mill scale.

The resin composition covers the surface of the sintered base material. The resin composition includes at least one thermosetting resin selected from the group consisting of polyamideimide, polyetheretherketone, polyamide, polyethylene terephthalate, polyetherimide, polyimide, polyphenylene sulfide, phenol resin, and polyacrylate. Applied. Furthermore, the resin composition contains a solid lubricant and a wear resistance imparting material. The solid lubricant is at least selected from the group consisting of polyethylene terephthalate (PTFE), ethylene tetrafluoroethylene (ETFE), tetrafluoroethylene hexafluoropropylene copolymer (FEP), graphite, tungsten disulfide and molybdenum disulfide. One. The wear resistance imparting material is made of calcium fluoride (CaF ₂ ), strontium fluoride (SrFs), magnesium fluoride (MgF ₂ ), alumina (Al ₂ O ₃ ), zinc oxide (ZnO ₂ ), and mica. It is at least one selected from the group.

  Hereinafter, a scroll type high and low pressure dome type compressor in which this sliding member is used as a sliding part will be described.

<Overall configuration of high / low pressure dome compressor>
The scroll type high / low pressure dome type compressor 1 constitutes a refrigerant circuit together with an evaporator, a condenser, an expansion mechanism, and the like, and plays a role of compressing a gas refrigerant in the refrigerant circuit. Further, as shown in FIG. 1, the high and low pressure dome type compressor 1 mainly includes a vertically long cylindrical sealed dome type casing 10, a scroll compression mechanism 15, an Oldham ring 39, a drive motor 16, a lower main bearing. 60, a suction pipe 19, and a discharge pipe 20. As described above, the sliding member of this embodiment is applied to at least one of the pin bearing portion 26c of the movable scroll 26, the bearing 34 of the upper housing 23, and the bearing portion 60a of the lower main bearing 60. ing. In addition, when applied to a rotary compressor such as an oscillating rotary compressor, the sliding member can be applied to components such as a pin bearing (piston inner circumference), a main bearing (front head), and a secondary bearing (rear head). is there.

  Hereinafter, the components of the high and low pressure dome compressor 1 will be described.

<Components of high and low pressure dome compressor>
(1) Casing The casing 10 includes a substantially cylindrical trunk casing portion 11, a bowl-shaped upper wall section 12, and a bowl-shaped bottom wall section 13. The upper wall portion 12 is welded to the upper end portion of the trunk portion casing portion 11 in an airtight manner. The bottom wall portion 13 is welded to the lower end portion of the body casing portion 11 in an airtight manner. The casing 10 mainly contains a scroll compression mechanism 15 and a drive motor 16. The drive motor 16 is disposed below the scroll compression mechanism 15. Further, the scroll compression mechanism 15 and the drive motor 16 are connected by a drive shaft 17 arranged so as to extend in the vertical direction in the casing 10.

(2) Scroll Compression Mechanism As shown in FIG. 1, the scroll compression mechanism 15 is mainly composed of a housing 23, a fixed scroll 24, and a movable scroll 26, and is a mechanism for compressing a gas refrigerant. . The fixed scroll 24 is disposed in close contact above the housing 23. The movable scroll 26 meshes with the fixed scroll 24.

  Hereinafter, the components of the scroll compression mechanism 15 will be described.

(A) Housing The housing 23 is mainly composed of a plate portion and a first outer peripheral wall erected from the outer peripheral surface of the plate portion. The housing 23 is press-fitted and fixed to the trunk casing portion 11 over the entire outer circumferential surface in the circumferential direction. That is, the body casing part 11 and the housing 23 are in close contact with each other in an airtight manner over the entire circumference. For this reason, the inside of the casing 10 is partitioned into a high pressure space 28 below the housing 23 and a low pressure space 29 above the housing 23. The fixed scroll 24 is fastened and fixed to the housing 23 with bolts 38 so that the upper end surface is in close contact with the lower end surface of the fixed scroll 24. The housing 23 is formed with a housing recess 31 that is recessed at the center of the upper surface, and a bearing portion 32 that extends downward from the center of the lower surface. A bearing hole 33 penetrating in the vertical direction is formed in the bearing portion 32, and the drive shaft 17 is rotatably fitted in the bearing hole 33 via a bearing 34.

(B) Fixed Scroll The fixed scroll 24 mainly includes an end plate 24a and a spiral (involute) wrap 24b formed on the lower surface of the end plate 24a. The end plate 24 a is formed with a discharge passage 41 that communicates with a compression chamber 40 described later and an enlarged recess 42 that communicates with the discharge passage 41. The discharge passage 41 is formed so as to extend in the vertical direction at the central portion of the end plate 24a. The enlarged concave portion 42 is constituted by a concave portion that is provided in the upper surface of the end plate 24a and that extends in the horizontal direction. A lid 44 is fastened and fixed to the upper surface of the fixed scroll 24 by bolts 44 a so as to close the enlarged concave portion 42. And the muffler space 45 which consists of an expansion chamber which silences the driving | running | working sound of the scroll compression mechanism 15 by covering the expansion recessed part 42 with the cover body 44 is formed. Further, the fixed scroll 24 and the lid body 44 are sealed by being brought into close contact with each other via a packing (not shown).

(C) Moveable Scroll As shown in FIG. 1, the movable scroll 26 is mainly formed on the end plate 26a, a spiral (involute) wrap 26b formed on the upper surface of the end plate 26a, and the lower surface of the end plate 26a. It is comprised from the bearing part 26c made and the groove part 26d formed in the both ends of the end plate 26a. The movable scroll 26 is supported by the housing 23 by fitting an Oldham ring 39, which will be described later, into the groove 26d. Further, the upper end of the drive shaft 17 is fitted into the bearing portion 26c. The movable scroll 26 revolves in the housing 23 without being rotated by the rotation of the drive shaft 17 by being incorporated in the scroll compression mechanism 15 in this way. The wrap 26b of the movable scroll 26 is meshed with the wrap 24b of the fixed scroll 24, and a compression chamber 40 is formed between the contact portions of both the wraps 24b and 26b. In the compression chamber 40, the volume between the laps 24b and 26b contracts toward the center as the movable scroll 26 revolves. In the high-low pressure dome type compressor 1 according to the present embodiment, the gas refrigerant is compressed in this way.

(D) Others In the scroll compression mechanism 15, a communication passage 46 is formed across the fixed scroll 24 and the housing 23. The communication passage 46 is formed so that a scroll-side passage 47 formed in the fixed scroll 24 and a housing-side passage 48 formed in the housing 23 communicate with each other. The upper end of the communication passage 46, that is, the upper end of the scroll side passage 47 opens into the enlarged recess 42, and the lower end of the communication passage 46, that is, the lower end of the housing side passage 48 opens into the lower end surface of the housing 23. In other words, the lower end opening of the housing side passage 48 constitutes a discharge port 49 through which the refrigerant in the communication passage 46 flows out into the gap space 18.

(3) Oldham ring The Oldham ring 39 is a member for preventing the rotational movement of the movable scroll 26 as described above, and is fitted into an Oldham groove (not shown) formed in the housing 23. The Oldham groove is an oval groove and is disposed at a position facing each other in the housing 23.

(4) Drive Motor The drive motor 16 is a DC motor in the present embodiment, and mainly includes an annular stator 51 fixed to the inner wall surface of the casing 10 and a slight gap (air gap) inside the stator 51. The rotor 52 is rotatably accommodated with a passage). The drive motor 16 is arranged such that the upper end of the coil end 53 formed on the upper side of the stator 51 is at substantially the same height as the lower end of the bearing portion 32 of the housing 23.

  In the stator 51, a copper wire is wound around a tooth portion, and a coil end 53 is formed above and below. Further, the outer peripheral surface of the stator 51 is provided with core cut portions that are notched at a plurality of locations from the upper end surface to the lower end surface of the stator 51 and at predetermined intervals in the circumferential direction. The core cut portion forms a motor cooling passage 55 extending in the vertical direction between the body casing portion 11 and the stator 51.

  The rotor 52 is drivably coupled to the movable scroll 26 of the scroll compression mechanism 15 via a drive shaft 17 disposed at the axial center of the body casing portion 11 so as to extend in the vertical direction. A guide plate 58 that guides the refrigerant that has flowed out of the discharge port 49 of the communication passage 46 to the motor cooling passage 55 is disposed in the gap space 18.

(5) Lower Main Bearing The lower main bearing 60 is disposed in the lower space below the drive motor 16. The lower main bearing 60 is fixed to the body casing portion 11 and constitutes a lower end bearing of the drive shaft 17, and the drive shaft 17 is supported by the bearing portion 60 a of the lower main bearing 60.

(6) Suction Pipe The suction pipe 19 is for guiding the refrigerant in the refrigerant circuit to the scroll compression mechanism 15 and is fitted into the upper wall portion 12 of the casing 10 in an airtight manner. The suction pipe 19 penetrates the low pressure space 29 in the vertical direction, and an inner end portion is fitted into the fixed scroll 24.

(7) Discharge pipe The discharge pipe 20 is for discharging the refrigerant in the casing 10 to the outside of the casing 10, and is fitted into the body casing portion 11 of the casing 10 in an airtight manner. The discharge pipe 20 has an inner end 36 that is formed in a cylindrical shape extending in the vertical direction and is fixed to the lower end of the housing 23. The inner end opening of the discharge pipe 20, that is, the inflow port, is opened downward.

<Operation of high / low pressure dome compressor>
Hereinafter, the operation of the high / low pressure dome type compressor 1 will be described.

  When the drive motor 16 is driven, the drive shaft 17 rotates and the movable scroll 26 performs a revolving motion without rotating. Then, the low-pressure gas refrigerant is sucked into the compression chamber 40 from the peripheral side of the compression chamber 40 through the suction pipe 19 and is compressed as the volume of the compression chamber 40 changes, and becomes a high-pressure gas refrigerant. The high-pressure gas refrigerant is discharged from the central portion of the compression chamber 40 through the discharge passage 41 to the muffler space 45, and then passes through the communication passage 46, the scroll side passage 47, the housing side passage 48, and the discharge port 49. Then, it flows out into the gap space 18 and flows downward between the guide plate 58 and the inner surface of the body casing portion 11. When the gas refrigerant flows downward between the guide plate 58 and the inner surface of the body casing portion 11, a part of the gas refrigerant is diverted to form a circle between the guide plate 58 and the drive motor 16. Flow in the direction. At this time, the lubricating oil mixed in the gas refrigerant is separated. On the other hand, the other part of the diverted gas refrigerant flows downward in the motor cooling passage 55, flows to the lower motor space, and then reverses to become an air gap passage between the stator 51 and the rotor 52, or to communicate therewith. It flows upward through the motor cooling passage 55 on the side facing the passage 46 (left side in FIG. 1). Thereafter, the gas refrigerant that has passed through the guide plate 58 and the gas refrigerant that has flowed through the air gap passage or the motor cooling passage 55 merge in the gap space 18 and flow into the discharge pipe 20 from the inner end 36 of the discharge pipe 20. And discharged outside the casing 10. The gas refrigerant discharged to the outside of the casing 10 circulates through the refrigerant circuit, and is again sucked into the scroll compression mechanism 15 through the suction pipe 19 and compressed.

<Features>
(1)
Conventionally, there is a sliding member in which a surface of an iron-based substrate is coated with a fluororesin having excellent wear resistance and low friction. However, in this sliding member, it may be difficult for the base material to hold the resin on the surface. Therefore, it is desired to improve the adhesion between the resin and the substrate in the sliding member.

  In the sliding member proposed in Japanese Examined Patent Publication No. 04-034601, a fluororesin covers a sintered base material having a large number of pores on the surface. In this sliding member, the fluororesin penetrates into pores near the surface layer of the sintered base material. For this reason, the adhesion between the resin and the sintered base material is improved.

  So, in the said embodiment, the sintering base material is manufactured by sintering metal powder, such as iron manufactured by reducing a mill scale. The metal powder produced by reducing the mill scale is characterized by the presence of pores inside the particles and significant irregularities on the particle surface. For this reason, in this sliding member, the effect which hold | maintains resin on the surface of a sintering base material can be improved.

  As a result, the adhesion between the resin and the sintered base material can be further improved.

  Moreover, in the sliding member proposed in Japanese Patent Publication No. 04-034601, in order to produce a sintered base material having pores on the surface, in the production process, a metal powder as a raw material of the sintered base material is used. It is adjusted to have a predetermined particle size distribution. This adjustment work imposes a burden on the manufacturing operator in the manufacturing process of the sintered base.

  Thus, in the sliding member of the present embodiment, the sintered base is manufactured by sintering metal powder such as iron manufactured by reducing the mill scale. For this reason, it is not necessary for the manufacturing operator to perform an operation of adjusting the metal material to have a predetermined particle size distribution. For this reason, the work burden of the manufacturing worker can be reduced.

  Since the present invention can further improve the adhesion between the resin and the sintered base, application to a sliding member is useful.

A longitudinal section of a high and low pressure dome type compressor provided with a sliding member concerning an embodiment of the present invention.

Explanation of symbols

26c Pin bearing (sliding member)
34 Bearing (sliding member)
60a Bearing part (sliding member)

Claims (5)

A sintered base having at least a surface portion obtained by sintering porous powder; and
A resin film covering the sintered base;
A sliding member (26c, 34, 60a). The porous powder is a powder produced by reducing a mill scale.
The sliding member (26c, 34, 60a) according to claim 1. The resin coating is at least one thermosetting resin selected from the group consisting of polyamideimide, polyetheretherketone, polyamide, polyethylene terephthalate, polyetherimide, polyimide, polyphenylene sulfide, phenol resin, and polyacrylate.
The sliding member (26c, 34, 60a) according to claim 1 or 2. The resin coating contains a solid lubricant,
The solid lubricant is at least one selected from the group consisting of polyethylene terephthalate, ethylene tetrafluoroethylene, tetrafluoroethylene hexafluoropropylene copolymer, graphite, tungsten disulfide, and molybdenum disulfide.
The sliding member (26c, 34, 60a) according to any one of claims 1 to 3. The resin coating contains an abrasion resistance imparting material,
The wear resistance imparting material is at least one selected from the group consisting of calcium fluoride, strontium fluoride, magnesium fluoride, alumina, zinc oxide, and mica.
The sliding member (26c, 34, 60a) according to any one of claims 1 to 4.

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