JP6313681B2 - Swash plate compressor hemispherical shoe and swash plate compressor - Google Patents

Description

  The present invention relates to a hemispherical shoe for converting a rotary motion of a swash plate into a reciprocating motion of a piston interposed between a swash plate and a piston in a swash plate type compressor used for an air conditioner for automobiles and the like.

  The swash plate compressor slides a hemispherical shoe on a swash plate mounted at a right angle and obliquely so as to be directly fixed to a rotating shaft or indirectly through a connecting member in a housing where refrigerant exists. The rotational movement of the swash plate is converted into the reciprocating movement of the piston through the shoe to compress and expand the refrigerant. Such swash plate compressors include a double swash plate type that compresses and expands refrigerant on both sides using a double-headed piston, and a single-slope that compresses and expands refrigerant only on one side using a single-headed piston. There is a board type. In addition, the hemispherical shoes include those that slide only on one side of the swash plate and those that slide on both sides of the swash plate. In these swash plate type compressors, sliding with a large relative speed of 20 m or more per second occurs on the sliding surface of the swash plate and the hemispheric shoe, and the hemispheric shoe is used in a very severe environment.

  As for lubrication, the lubricating oil is diluted while dissolved in the refrigerant, circulates in the housing, and is supplied to the sliding portion in the form of a mist. However, when the operation is resumed from the operation stop state, the lubricating oil is washed away by the liquefied refrigerant, and the sliding surface between the swash plate and the hemispherical shoe at the start of the operation becomes a dry lubricating state without the lubricating oil, There is a problem that seizure is likely to occur.

  As a means for preventing this seizure, for example, a polyether ether ketone (PEEK) resin film is directly formed on at least sliding surfaces of a swash plate and a hemispherical shoe by an electrostatic powder coating method (see Patent Document 1). There has been proposed a thermoplastic polyimide coating containing a solid lubricant formed by an electrostatic powder coating method (see Patent Document 2).

  Further, in order to ensure high slidability under high speed and high temperature conditions, a binder made of PEEK resin at at least one sliding contact portion of the swash plate, hemispherical shoe and piston, and a solid lubricant dispersed in the binder The thing which formed the sliding layer which becomes (refer patent document 3) is proposed.

JP 2002-180964 A JP 2003-049766 A JP 2002-039062 A

  In the prior art, in order to improve the lubrication characteristics of the swash plate and the hemispherical shoe, as described above, a method of forming the sliding surface of the swash plate and the hemispherical shoe with a lubricating coating has been proposed. There was no formation of a lubricious coating on the hemispherical shoe, even though a lubricious coating was formed on the plate. The reason for this is that the sliding area of the hemispherical shoe is smaller than that of the swash plate, and the sliding with the spherical seat of the piston is also received. Is guessed.

  For example, when the entire surface of the hemispherical shoe is covered with a resin film for sliding with the swash plate and the piston as in the prior art, the heat dissipation of the frictional heat decreases and the temperature of the hemispherical shoe base material increases, It can happen that the resin coating dissolves. In addition, the formation of a resin film by electrostatic powder coating or coating liquid application exposes the hemispherical shoe to the firing temperature, and there is a concern that the strength may decrease. In addition, when a resin film is formed for each of the plurality of sliding surfaces of the hemispherical shoe, there is a possibility that peeling for each sliding surface is likely to occur structurally.

  On the other hand, a swash plate with a lubricious coating is not only strict in terms of flatness, parallelism and thickness accuracy of the sliding surface, but also has a low coating cost due to the large coating area of the lubricious coating made of expensive materials. There is a problem that you can not.

  The present invention has been made to address these problems, and seizure does not occur even in a dry lubrication state where there is no lubricating oil at the start of operation. It is an object to provide a hemispherical shoe with no durability and sufficient durability. Another object of the present invention is to provide a swash plate compressor in which a lubricating coating is removed from a sliding surface of a swash plate or a piston by using this hemispherical shoe.

  The hemispherical shoe of the swash plate compressor according to the present invention has a hemispherical shoe attached to a swash plate mounted at a right angle and obliquely so as to be fixed directly to a rotating shaft or indirectly through a connecting member in a housing in which a refrigerant exists. A swash plate-type compressor hemisphere shoe that slides and converts the rotational movement of the swash plate into a reciprocating movement of the piston through the hemisphere shoe to compress and expand the refrigerant. And a resin layer is formed on the surface of the flat portion that slides with the swash plate and the surface of the spherical portion that slides with the piston, and the resin layer of the flat portion and the resin layer of the spherical portion are integrated. And at least a part of the base material is exposed without being covered with the resin layer.

  The base material is formed with (1) a hollow portion that becomes a concave portion from the spherical portion side or the flat portion side, or (2) a hollow portion that penetrates the spherical portion side and the flat portion side at the central axis portion, At least a part of the hollow portion is exposed without being filled with the resin layer. The axial length of the exposed portion of the hollow portion is not less than one third of the height of the hemispherical shoe.

  The hemispherical shoe has a non-contact portion with the piston at the center on the spherical surface side, and the base material is exposed without being covered with the resin layer in the non-contact portion.

  The base material is characterized in that at least a part of an outer peripheral part connecting the flat part and the spherical part is exposed without being covered with a resin layer.

  The swash plate type compressor of the present invention slides a hemispherical shoe on a swash plate attached at right angles and obliquely so as to be fixed directly to a rotating shaft or indirectly through a connecting member in a housing in which refrigerant exists. A swash plate compressor that compresses and expands the refrigerant by converting the rotational movement of the swash plate into a reciprocating movement of the piston through the hemispheric shoe, and the hemispheric shoe is the hemispheric shoe of the present invention. To do. The sliding surface of the swash plate with the hemispherical shoe is a polished surface of the swash plate base material and does not have a lubricating coating. Further, the refrigerant is carbon dioxide gas.

  The hemispherical shoe of the swash plate compressor of the present invention uses a metal member as a base material, and a resin layer is formed on the surface of the flat surface portion that slides with the swash plate and the surface of the spherical surface portion that slides with the piston. Since the portion is exposed without being covered with the resin layer, the heat dissipation and load resistance are excellent, and the slidability between the swash plate and the piston is excellent. Moreover, since the resin layer of the plane part and the resin layer of the spherical part are an integral layer, it is possible to prevent the resin layer from peeling from the base material.

  The base material is formed with (1) a hollow portion that becomes a concave portion from the spherical portion side or the flat portion side, or (2) a hollow portion that penetrates the spherical portion side and the flat portion side at the central axis portion, Since at least a part of the hollow portion is exposed without being filled with the resin layer, the frictional heat is transmitted through the base material and is radiated to the outside from the exposed hollow portion. For this reason, it is excellent in abrasion resistance and seizure resistance. Moreover, since the exposed part of a hollow part is 1/3 or more of the height of a hemispherical shoe, heat dissipation can be improved more. Since the hollow portion is the heat dissipation portion, it is easier to ensure a large heat dissipation portion area than when a part of the outer surface is the heat dissipation portion.

  The hemispherical shoe has a non-contact portion with the piston in the center on the spherical surface side, and the base material is exposed without being covered with the resin layer in the non-contact portion, so that the frictional heat generated in the spherical surface portion is It becomes easy to radiate heat from the exposed part.

  In the base material, at least a part of the outer peripheral portion connecting the flat surface portion and the spherical surface portion is exposed without being covered with the resin layer, so that the frictional heat is transmitted through the base material, and the exposed outer peripheral portion is exposed to the outside. Heat is dissipated. For this reason, it is excellent in abrasion resistance and seizure resistance. Further, since the outer peripheral portion is not a sliding portion with other members, it is not essential to form a resin layer. For this reason, compared with a spherical surface part and a plane part, it is easy to ensure a large thermal radiation part area.

  Since the swash plate compressor of the present invention includes the above-described hemispherical shoe, no seizure occurs on the sliding surface of the hemispherical shoe even in a dry lubrication state without lubricating oil at the start of operation. This is a swash plate compressor that has excellent durability, no deterioration of lubrication characteristics due to heat generation, and no peeling of the resin layer. Also, using the above-described hemispherical shoe, the sliding surface of the swash plate with the hemispherical shoe is a polished surface of the swash plate base material and does not have a lubricous coating, so despite being functionally equivalent, A low-priced swash plate compressor can be provided. Furthermore, since it can be used for high surface pressure (for example, more than 8 MPa) specifications, it is suitable for those using carbon dioxide gas or HFC1234yf as a refrigerant.

It is a longitudinal cross-sectional view which shows an example of the swash plate type compressor of this invention. It is the longitudinal cross-sectional view and top view which expand and show the hemispherical shoe of FIG. It is a longitudinal cross-sectional view which shows the other example of a hemispherical shoe. It is a longitudinal cross-sectional view which shows the other example of a hemispherical shoe. It is a longitudinal cross-sectional view which shows the other example of a hemispherical shoe.

  An embodiment of a swash plate compressor according to the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an example of a swash plate compressor of the present invention. The swash plate type compressor shown in FIG. 1 uses carbon dioxide gas as a refrigerant. The swash plate 3 attached obliquely so as to be directly fixed to the rotary shaft 2 in the housing 1 in which the refrigerant exists is inclined. It is converted into a reciprocating motion of a double-headed piston 9 through a hemispherical shoe 4 that slides on both sides of the plate 3, and a refrigerant is generated on both sides of each piston 9 in a cylinder bore 10 formed at equal intervals in the circumferential direction of the housing 1. The swash plate type that compresses and expands. The rotary shaft 2 that is rotationally driven at high speed is supported by a needle roller bearing 11 in the radial direction and supported by a thrust needle roller bearing 12 in the thrust direction. In this configuration, the swash plate 3 may be fixed to the rotary shaft 2 indirectly via a connecting member. Moreover, the aspect attached rather than diagonally may be sufficient.

  Each piston 9 is formed with a recess 9 a so as to straddle the outer periphery of the swash plate 3, and a hemispherical shoe 4 is seated on a spherical seat 13 formed on the axially opposed surface of this recess 9 a, The swash plate 3 is supported so as to be movable relative to the rotation of the swash plate 3. Thereby, conversion from the rotational movement of the swash plate 3 to the reciprocating movement of the piston 9 is performed smoothly. The hemispherical shoe 4 has a spherical portion that slides with the piston 9 (spherical seat 13) and a flat portion that slides with the swash plate 3.

  The structure of the hemispherical shoe will be described in detail with reference to FIG. 2 is a longitudinal sectional view showing an example of the hemispherical shoe of the present invention, and the lower view of FIG. 2 is a plan view thereof. As shown in FIG. 2, the hemispherical shoe 4 includes a spherical portion 4a constituting a part of the sphere, a flat portion 4b in which the sphere is cut in a substantially flat surface on the opposite side of the spherical portion 4a, a spherical portion 4a, It has a substantially hemispherical structure composed of an outer peripheral part 4c connecting the flat part 4b. Further, the hemispherical shoe 4 has a circular planar shape, and the surface of the outer peripheral portion 4c (the surface of the resin layer 6c) is a cylindrical outer peripheral surface. The overall shape of the hemispherical shoe 4 is a shape in which one bottom surface of the cylindrical body is a convex shape constituting a part of the hemisphere. The overall shape of the hemispherical shoe 4 is not limited to this, and it is sufficient if it has a flat surface portion that slides with the swash plate and a spherical surface portion that slides with the piston. It is good also as a shape which does not have.

  The hemispherical shoe 4 uses a metal member as a base material 5 and has a resin layer 6 formed on the surface of a flat surface portion 4b that slides with a swash plate and the surface of a spherical surface portion 4a that slides with a piston. Of the resin layer 6, the resin layer 6a is formed on the surface of the spherical surface portion 4a, the resin layer 6b is formed on the surface of the flat surface portion 4b, and the resin layer 6 is formed on the outer peripheral portion 4c. Layer 6c. Here, the resin layer 6b of the flat surface portion 4b and the resin layer 6a of the spherical surface portion 4a are continuous resin layers through the resin layer 6c of the outer peripheral portion 4c, and are integrally formed so as to cover the surface of the base material 5. Has been. In the case where the diameter of the hemispherical shoe is about 10 mm (5 to 15 mm), the thickness of the resin layer covering the outside of the base material 5 is 0.1 to 0.7 mm, and the shape of the base material 5 is the entire hemispherical shoe 4. It is a shape along the shape. It is preferable to make the resin layer as thin as the above-mentioned range since the frictional heat easily escapes from the frictional sliding surface to the substrate side and is difficult to store heat. Within the above range, it is preferable that the thickness of the resin layer 6a of the spherical surface portion 4a is larger than the thickness of the resin layer 6b of the flat surface portion 4b.

  In the hemispherical shoe of the present invention, in the metal base material, the above resin layer is formed on the direct sliding surface with both the piston and the swash plate member, but the other portions are not covered with the resin layer. It has an exposed part. Even if frictional heat due to sliding with the swash plate and piston occurs, heat can be transferred from the exposed part through the base material, and the resin layer does not dissolve, resulting in wear resistance and seizure resistance. Excellent. The position and form of the exposed portion of the base material are not particularly limited as long as they are other than the direct sliding surfaces with both the piston and swash plate members, but because of excellent workability and heat dissipation, (1 ) A hollow part that becomes a concave part from the spherical part side or the flat part side, or (2) a hollow part that penetrates the spherical part side and the flat part side is formed, and at least a part of the hollow part is filled with a resin layer The form exposed without being preferable is preferable.

  In the form shown in FIG. 2, the base material 5 is formed with a cylindrical space-like hollow portion 7 penetrating the spherical surface portion 4a side and the flat surface portion 4b side at the center axis portion of the circular center. The hollow portion 7 is filled with the resin layer 6d from the plane portion 4b side to a predetermined axial depth, and the other portion (exposed portion) is not covered with the resin, and the surface of the base material constituting the hollow portion is exposed. It has become a state. By having the exposed portion in the hollow portion 7, the frictional heat is radiated from the portion to the outside. The exposed portion also functions as an oil pocket that holds the lubricating oil.

  The axial length of the exposed portion of the hollow portion 7 is preferably at least one third of the height of the hemispherical shoe. By setting it as this range, the area of a thermal radiation part can be enlarged and it is excellent in heat dissipation. The diameter of the hollow portion 7 is preferably in the range of 1/6 to 1/3 of the diameter of the hemispherical shoe 4. By making it within this range, it is possible to prevent the strength of the base material from being lowered while ensuring heat dissipation.

  The hemispherical shoe 4 of the form shown in FIG. 2 has a non-contact portion 8 with the piston on the outer surface on the spherical surface portion 4a side, and the base material 5 is exposed without being covered with the resin layer 6 in the non-contact portion 8. Yes. The non-contact portion 8 is a portion having a shape obtained by cutting a part of the spherical portion 4a with a plane parallel to the flat portion 4b, and is a portion that does not slide contact with the piston. In this form, the planar shape of the non-contact part 8 is circular. By providing such a non-contact part and an exposed part of the base material on the outer surface on the spherical part 4a side, it becomes easy to radiate the frictional heat generated in the spherical part from the exposed part. In the case of the non-contact portion 8 shown in FIG. 2, the size (diameter) of the non-contact portion 8 is preferably in the range of 1/3 to 1/2 with respect to the diameter of the hemispherical shoe 4. By setting it within this range, heat dissipation can be improved while securing a sufficient sliding area between the spherical surface portion and the piston.

  Another embodiment of the hemispherical shoe of the present invention will be described with reference to FIGS. 3 to 5 are longitudinal sectional views showing other examples of hemispherical shoes. In the hemispherical shoe 4 of FIG. 3, a hollow portion 7 that penetrates the spherical surface portion 4 a side and the flat surface portion 4 b side is formed in the central axis portion of the circular center of the base material 5. In this embodiment, the hollow portion 7 is filled with the resin layer 6d from the spherical surface portion 4a side to a predetermined axial depth, and the other portion (exposed portion) is not covered with the resin and is a base constituting the hollow portion. The material surface is exposed. Since the exposed portion of the hollow portion 7 is on the side of the flat portion 4b, the sliding property with the swash plate is particularly excellent due to the heat dissipation and the function as an oil pocket. Further, in the hemispherical shoe 4 of FIG. 4, a hollow portion 7 having a cylindrical space that is a concave portion from the spherical surface side is formed in the central axis portion of the circular center of the base material 5. In this form, the hollow portion 7 is not filled with the resin layer 6, and the entire surface of the base material constituting the hollow portion is exposed.

  The hemispherical shoe 4 in FIG. 5 is in an exposed state where the outer peripheral portion 4 c that connects the flat portion 4 b and the spherical portion 4 a is not covered with the resin layer 6. Since the outer peripheral part 4c is a part which does not slide with other members, such as a swash plate and a piston, formation of a resin layer is not essential. For this reason, compared with the spherical surface part 4a and the plane part 4b, it is easy to ensure the base-material exposed area used as a thermal radiation part large. Further, in order to increase the area of the heat radiating portion, a hollow portion as shown in FIG. 4 may be formed in the outer peripheral portion 4c.

  In the hemispherical shoe 4, the flat surface portion 4b that slides with the swash plate and the spherical surface portion 4a that slides with the piston are located on the opposite sides in the axial direction. By making the resin layers formed on these surfaces continuous and continuous through the outer peripheral part (FIGS. 2 to 4) and the hollow part (FIG. 5), the resin layers on both sides are structurally a base material. It becomes difficult to peel from.

  The synthetic resin (base resin) for forming the resin layer is not particularly limited as long as it can ensure the lubrication characteristics and heat resistance required for the hemispherical shoe. For example, polyphenylene sulfide (PPS) resin, polyamideimide (PAI) ) Resin, polyether ether ketone (PEEK) resin, polyimide (PI) resin, phenol resin and the like. Each of these synthetic resins may be used alone or may be a polymer alloy in which two or more kinds are mixed. Among these, PAI resin, PEEK resin, and PI resin excellent in heat resistance and wear resistance are preferable, and PEEK resin excellent in fatigue characteristics and fluidity during injection molding is particularly preferable. These synthetic resins may be blended with carbon fiber, glass fiber, mica, talc and the like for the purpose of improving wear resistance. Further, for the purpose of reducing friction and improving seizure resistance when oil is exhausted, polytetrafluoroethylene (PTFE) resin, graphite, molybdenum disulfide, or the like may be blended.

  As a method for forming the resin layer, injection molding, spray coating, powder coating, or the like can be employed. Of these, injection molding is preferred because an inexpensive and dense resin layer can be formed. In injection molding, since a pressure is applied to a resin composition in a molten state, a resin layer is densely formed, and load resistance and wear resistance are increased. As an injection molding method, for example, a method in which a base material of a hemispherical shoe is set in a mold, and a synthetic resin is injection molded (insert molding) from the top can be adopted. In addition, when the resin layer is formed by injection molding, the resin layer may be machined to a desired dimension after injection molding, in addition to being molded once to a desired dimension by injection molding.

  Examples of the metal member that is a base material include a member made of melted metal manufactured by pressing, machining, die casting, or the like. In addition, as the molten metal, for example, steel such as bearing steel (SUJ1-5, etc.), chromium molybdenum steel, carbon steel for mechanical structure, mild steel, stainless steel, or high speed steel, aluminum, aluminum alloy, copper, A copper alloy is mentioned.

  When using molten metal as the metal material of the base material, the surface of the base material is made uneven by physical surface treatment such as shot blasting or machining before the resin layer is formed in order to improve the adhesion with the resin layer. Raging is preferred. Also, chemical surface treatment such as acidic solution treatment (mixed with sulfuric acid, nitric acid, hydrochloric acid, etc. or other solutions), alkaline solution treatment (mixed with sodium hydroxide, potassium hydroxide, etc. or other solutions) It is preferable to form a fine concavo-convex shape on at least the resin layer forming surface of the substrate. The acidic solution treatment is preferable because masking can be omitted. Although the fine uneven shape varies depending on the concentration, processing time, post-treatment, etc., in order to improve the adhesion due to the anchor effect, it is preferable to make the fine unevenness with a concave pitch of several nanometers to several tens of micrometers. The fine uneven shape formed by the chemical surface treatment has a complicated three-dimensional structure such as a porous structure, so that the anchor effect is easily exhibited, and particularly strong adhesion is possible. In addition, you may perform the process which forms a reactive chemical film on the base-material surface.

  In addition, a sintered metal member having a concavo-convex surface can be employed as the metal member that is a base material. When a sintered metal is used as the metal material of the substrate, the surface area of the resin layer forming surface is large and the anchor effect due to the unevenness is high, so that the adhesion strength with the resin layer can be increased. In particular, by forming the resin layer by insert molding, the resin layer bites into the irregularities on the surface of the sintered metal during injection molding, and the true bonding area increases, so the adhesion strength between the resin layer and the substrate improves. . Furthermore, since the true bonding area between the resin layer and the base material is increased and there is no gap between the resin layer and the base material, the heat of the resin layer is easily transmitted to the base material.

  Moreover, it is preferable that the density of a sintered metal shall be 0.7-0.9 of the theoretical density ratio of a material. The theoretical density ratio of the material is the ratio of the density of the base material when the theoretical density of the material (density when the porosity is 0%) is 1. By making it within this range, it is possible to ensure the unevenness of the surface for obtaining adhesion, and at the same time to have high density and sufficiently ensure the thermal conductivity of the substrate. Moreover, since it is excellent in the joint strength of the joint part of a resin layer and a base material, even when used on severe conditions, such as a high surface pressure, it can prevent that a resin layer peels from a base material.

  The surface of the resin layer serving as a sliding surface with the swash plate or the piston may be polished after the resin layer is formed. The polishing process eliminates variations in individual height dimensions and improves accuracy. Moreover, it is preferable to adjust the surface roughness of the surface of the resin layer to 0.05 to 1.0 μm Ra (JIS B0601). By setting it within this range, the real contact area on the sliding surface of the resin layer sliding with the swash plate or the piston is increased, the actual surface pressure can be lowered, and seizure can be prevented. If the surface roughness is less than 0.05 μmRa, the lubricating oil is insufficiently supplied to the sliding surface. If the surface roughness exceeds 1.0 μmRa, the surface area is locally increased due to a decrease in the real contact area on the sliding surface, and seizure occurs. There is a fear. More preferably, the surface roughness is 0.1 to 0.5 μmRa.

  Oil pockets and dynamic pressure grooves may be formed on the surface of the resin layer serving as the sliding surface with the swash plate or the piston in addition to the above-described hollow portion in order to supplement the lubricating action during lean lubrication. Examples of the shape of the oil pocket include a spot-like or streak-like recess. Examples of the spot shape or the stripe shape include a parallel straight line shape, a lattice shape, a spiral shape, a radial shape, and a ring shape. The depth of the oil pocket can be determined as appropriate below the thickness of the resin layer.

  The swash plate type compressor in which the hemispherical shoe of the present invention is used is a swash plate that is fixed to the rotating shaft directly or indirectly through a connecting member at right angles and obliquely in a housing where refrigerant exists. This is a swash plate type compressor that compresses and expands the refrigerant by sliding a hemispherical shoe and converting the rotational motion of the swash plate into a reciprocating motion of the piston through the hemispherical shoe. By using the hemispherical shoe of the present invention in the swash plate compressor, the lubricating coating can be removed from the swash plate and the piston that slide with the hemispherical shoe. That is, the surface of the swash plate or the like can be incorporated in the swash plate compressor and slid with the hemispherical shoe while the surface of the substrate remains the polished surface. Therefore, it is possible to provide a low-cost swash plate compressor that is functionally equivalent.

  The hemispherical shoe of the swash plate compressor according to the present invention has sufficient durability with no seizure even in a dry lubrication state without lubricating oil at the start of operation, and there is no deterioration in lubrication characteristics due to frictional heat generation and peeling of the resin layer. Therefore, it can be used for various swash plate compressors. In particular, carbon dioxide gas or HFC1234yf is used as a refrigerant, and it can be suitably used for a recent swash plate type compressor having a high-speed and high-load specification.

DESCRIPTION OF SYMBOLS 1 Housing 2 Rotating shaft 3 Swash plate 4 Hemispherical shoe 5 Base material (metal member)
6 Resin layer 7 Hollow portion 8 Non-contact portion 9 Piston 10 Cylinder bore 11 Needle roller bearing 12 Thrust needle roller bearing 13 Spherical seat

Claims (8)

In the housing in which the refrigerant is present, the hemispherical shoe is slid on a swash plate mounted at right angles and obliquely so as to be directly fixed to the rotating shaft or indirectly through the connecting member, and the hemispherical shoe is passed through the hemispherical shoe. A hemispherical shoe for a swash plate type compressor that compresses and expands the refrigerant by converting the rotational movement of the swash plate into the reciprocating movement of the piston,
The hemispherical shoe has a metal member as a base material, and a resin layer is formed on the surface of the flat portion sliding with the swash plate and the surface of the spherical portion sliding with the piston,
The swash plate compressor characterized in that the resin layer of the planar portion and the resin layer of the spherical portion are an integral layer, and at least a part of the base material is exposed without being covered with the resin layer. Hemisphere shoe.   The base material is formed with (1) a hollow portion that becomes a concave portion from the spherical surface side or the flat surface portion side, or (2) a hollow portion that passes through the spherical surface side and the flat surface portion side at the central axis portion, The hemispherical shoe for a swash plate compressor according to claim 1, wherein at least a part of the hollow portion is exposed without being filled with the resin layer.   The hemispherical shoe for a swash plate compressor according to claim 2, wherein an axial length of the exposed portion of the hollow portion is one third or more of a height of the hemispherical shoe.   The hemispherical shoe has a non-contact portion with the piston on the outer surface on the spherical surface side, and the base material is exposed without being covered with the resin layer in the non-contact portion. A hemispherical shoe for a swash plate compressor according to claim 1, 2 or 3.   5. The substrate according to claim 1, wherein at least a part of an outer peripheral portion connecting the flat portion and the spherical portion is exposed without being covered with a resin layer. A hemispherical shoe for the described swash plate compressor. In the housing in which the refrigerant is present, the hemispherical shoe is slid on a swash plate mounted at right angles and obliquely so as to be directly fixed to the rotating shaft or indirectly through the connecting member, and the hemispherical shoe is passed through the hemispherical shoe. A swash plate type compressor that compresses and expands refrigerant by converting the rotational movement of the swash plate into the reciprocating movement of the piston,
The swash plate compressor, wherein the hemispherical shoe is the hemispherical shoe according to any one of claims 1 to 5.   The swash plate compressor according to claim 6, wherein a sliding surface of the swash plate with the hemispherical shoe is a polished surface of a swash plate base material and does not have a lubricating coating.   The swash plate compressor according to claim 6 or 7, wherein the refrigerant is carbon dioxide gas.

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