JP2012197900A - Sliding component and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding component that has recessed parts that are effective in holding lubricating oil and securing abrasive powder, has superior abrasion resistance, and can suppress seizure.SOLUTION: The sliding component is provided with a pair of sliding surfaces with flat surfaces made to face each other and slide, and characterized by recessed parts formed in at least one of the sliding surfaces and a lipophilic substance being formed so as to cover the inside surfaces of these recessed parts. In addition, the lipophilic substance is an inorganic substance containing carbon atoms and is characterized by being formed from any of graphite, diamond-like carbon, and carbon nanotubes. Because of this constitution, in mechanical components that slide, lubricating oil can be maintained on the surface of the sliding components during sliding, and therefore friction loss can be reduced and seizure can be suppressed.

Description

  The present invention relates to a sliding component that slides under a high load and a method for manufacturing the same.

  In sliding parts that slide facing each other through a lubricating oil or the like, there is a demand for improved wear resistance and seizure resistance against wear and seizure caused by high loads, deterioration of the lubricating oil, and the like. Spheroidal graphite cast iron, which has spherical graphite in the base structure of the sliding member, generally has good bearing performance because graphite itself functions as a solid lubricant and has good lubricating oil retention. Are known. However, in cutting and grinding processes, cast iron is stretched and formed on spheroidal graphite, and this has become one of the factors that cause wear and seizure by contact with the mating member during operation. Japanese Patent Laid-Open No. 2-310335 (Patent Document 1) discloses a technique for suppressing the burrs and using spheroidal graphite cast iron for bearings. This publication describes that a high-speed rotating member made of spheroidal graphite cast iron member having excellent bearing performance that can withstand high load and high rotation is provided by improving the surface condition by both the base structure of the material and the surface treatment. Yes.

Japanese Patent Laid-Open No. 2-310335

  However, when the spheroidal graphite cast iron is treated by the surface treatment method of Patent Document 1, the stencil portion of the base structure is removed and the underlying spheroidal graphite can be exposed. The dent is about 1.0 μm at most. With this size, the amount of lubricating oil stored in the recess is small, and it is not sufficient to secure the wear powder generated regularly by sliding in the recess.

  An object of the present invention is to provide an excellent wear resistance and a sliding part capable of suppressing seizures having a concave portion effective for retaining lubricating oil and securing wear powder.

  In order to achieve the above object, for example, the configuration described in the claims is adopted.

  (1) The present application includes a plurality of means for solving the above-described problems. To give an example, the present application is a sliding component having a pair of sliding surfaces that slide against each other, and at least A concave portion is formed on one sliding surface, and a lipophilic substance is formed on at least a part of the inner surface of the concave portion.

  The lipophilic substance (1) is a carbon atom-containing inorganic substance, and the carbon-containing inorganic substance is composed of any of graphite, diamond-like carbon, and carbon nanotubes.

  (1) The lipophilic substance surface formed in at least a part of the inner surface of the recess is recessed by 5 μm or more with respect to the surface of the sliding surface.

  The pair of sliding surfaces of (1) is a sliding surface of a sliding component of a compressor.

  The pair of sliding surfaces of (1) is a sliding surface of a sliding component of a hydraulic device.

  (2) The present application is a method of manufacturing a sliding component having a pair of sliding surfaces that slide while abutting one surface of each other, and at least one of the pair of sliding surfaces is a parent surface. It is characterized in that it is formed by polishing the surface of cast iron containing an oily substance with loose abrasive grains.

  The lipophilic substance (2) is a carbon atom-containing inorganic substance, and the carbon atom-containing inorganic substance is made of graphite.

  The free abrasive grains of (2) above have an average particle size of 30 μm or more.

  (3) The present application is a manufacturing method of a sliding component having a pair of sliding surfaces that slide while abutting one surface of each other, and at least one of the pair of sliding surfaces is slid. A concave portion is formed on the surface of the moving member, and the lipophilic substance is deposited on at least a part of the inner surface of the concave portion.

  The lipophilic substance (3) is a carbon atom-containing inorganic substance, and the carbon-containing inorganic substance is composed of any of graphite, diamond-like carbon, and carbon nanotubes.

  According to the present invention, in a sliding machine part, the lubricating oil can be held on the surface of the sliding part during sliding, so that friction loss can be reduced and seizure can be suppressed.

It is sectional drawing of the structure of the sliding component of this invention. It is a schematic diagram of the cross section of the sliding surface vicinity of the sliding component of this invention. It is process drawing for demonstrating the manufacturing process of the sliding components in connection with 1st embodiment of this invention. It is sectional drawing showing the recessed part of a structure where an opening part is narrower than an inside in the sliding surface of the sliding component in connection with 1st embodiment of this invention. It is a top view of the sliding face in which the recessed part in connection with 1st embodiment of this invention was formed. It is process drawing for demonstrating the manufacturing process of the sliding components in connection with 2nd embodiment of this invention. It is process drawing for demonstrating the manufacturing process of the sliding components in connection with 3rd embodiment of this invention. It is process drawing for demonstrating the manufacturing process of the sliding component in connection with 4th embodiment of this invention. It is the schematic of the turning scroll components of the scroll compressor which is an example of the sliding components of this invention. It is sectional drawing showing the structural example of the hydraulic equipment which has the sliding component of this invention as a structural member.

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

  In the present embodiment, an example of a sliding component in which a lipophilic substance is provided in the concave portion of the sliding face and the lipophilic substance is recessed from the sliding face will be described.

  FIG. 1 is a cross-sectional view of the structure of the sliding component of the present invention.

  In FIG. 1, 1 is a sliding member, 2 is a sliding surface, 6 is a recess provided on the sliding surface, and 7 is a lipophilic substance provided in the recess 6. Moreover, the recessed part 6 provided in the surface of the sliding member 1 may differ in a magnitude | size like FIG. 1, and may be the substantially same magnitude | size. Further, the lipophilic substance 7 provided in the concave portion 6 on the surface is formed to cover the inside of the concave portion 6, and by providing a certain amount of space in the concave portion 6, lubricating oil can be stored and retained during sliding. Here, as the sliding member, cast iron material, wrought iron material, stainless steel material, phosphor bronze, chrome molybdenum steel, or the like can be used, and the lipophilic substance 7 has good familiarity with the lubricating oil 5 (that is, the parent to the lubricating oil). Graphite, diamond-like carbon (hereinafter referred to as DLC), carbon nanotubes (hereinafter referred to as CNT), etc., which are carbon atom-containing inorganic substances having a high surface energy of the oily substance 7 can be used.

  FIG. 2 is a schematic diagram of a cross section in the vicinity of the sliding surface when the sliding component of this embodiment slides facing another sliding component.

  In FIG. 2, sliding between the sliding member 1 of the present embodiment (hereinafter referred to as the first sliding member) and the opposing sliding member 3 (hereinafter referred to as the second sliding member). The surface is arranged via the lubricating oil 5.

  The sliding surface 2 of the first sliding member 1 and the sliding surface 4 of the second sliding member 3 are in the opposite directions, or the other is moved and slid while one is stopped. A recess 6 is provided in the sliding surface 2 of the first sliding member 1, and a lipophilic substance 7 is formed on the inside thereof.

  Since the lipophilic substance 7 is recessed with respect to the sliding surface 2 and the lipophilic substance 7 has good compatibility with the lubricating oil 5 during operation, it is easy to secure the lubricating oil in the recessed portion 6 that is the recess. Thus, when a high load is applied to the sliding portion and it becomes difficult to supply the lubricating oil from the outside to the sliding surface, the lubricating oil 5 in the concave portion 6 effectively acts to suppress seizure or the like. be able to. Further, since the wear powder of the sliding member generated during operation can be secured by the recess 6, wear of the sliding surface 2 and the sliding surface 4 due to the biting of the wear powder can be suppressed.

  As a method of incorporating the lipophilic substance 7 in the recess 6 of the sliding surface 2, the sliding surface 1 is made of a material containing a lipophilic substance made of graphite such as spheroidal graphite cast iron in the first sliding member 1. After processing the entire surface, the spherical graphite portion, which is a lipophilic substance, is exposed and the spherical graphite portion is recessed, or a recess 6 is formed on the sliding surface 2, and then the lipophilic substance 7 is slid including the recess 6. After forming the entire surface, the method of selectively removing the lipophilic substance 7 formed on the sliding surface 2, or forming the recess 3 after processing the entire sliding surface, You may obtain by any system, such as the system selectively provided in the recessed part 6. FIG.

  The depth of the dent from the sliding surface of the lipophilic substance 7 is preferably at least 5 μm from the viewpoint of retaining the lubricating oil and securing the wear powder, and a deeper depth is preferably at least 5 μm. Will improve. In addition, the planar shape viewed from the sliding surface of the recess 6 can retain lubricating oil and ensure wear powder even when the shape is circular, rectangular, elliptical, or a part of the contour is distorted. If it doesn't become Bali, there is no problem.

  Further, the same material as that of the first sliding member 1 can be used for the second sliding member 3, and a lipophilic substance is provided in the concave portion in the same manner as the sliding surface 2 of the first sliding member 1. It is good also as a form.

  In this embodiment, in the manufacturing method of the sliding part in which the lipophilic substance is provided in the concave portion of the sliding surface and the lipophilic substance is recessed from the sliding surface, a sliding member containing the lipophilic substance is used. An example of a method for manufacturing a sliding component that forms a lipophilic substance having a concave shape by polishing with loose abrasive grains will be described.

  FIG. 3 is a process diagram for explaining the manufacturing process of the sliding component according to the first embodiment of the present invention. FIG. 3 (a) is a diagram before cutting the sliding surface from the material containing the lipophilic substance. (B) shows a state of polishing using free abrasive grains of a sliding member containing a lipophilic substance, and (c) shows a sliding surface formed by polishing with free abrasive grains. Represents the state of

  In FIG. 3 (a), the sliding member 8 is made of spheroidal graphite cast iron, and the lipophilic substance 9 made of spherical graphite having good compatibility with the lubricating oil is contained therein. The upper part of the broken line A-A ′ of the sliding member 8 is removed by machining or the like to obtain a surface indicated by an arrow of the broken line A-A ′ that becomes a sliding surface.

In FIG. 3 (b), the polishing liquid 12 containing the abrasive grains 11 is supplied to the sliding surface 10 of the sliding member 8 and the surface plate 13 is pressed against the sliding member 8 while moving relative to the sliding member 8. The abrasive grains 11 act freely on the sliding surface 10. The abrasive grains 11 need only have the ability to process cast iron and graphite. For example, silicon carbide (SiC), alumina (Al ₂ O ₃ ), diamond, or the like can be used, or even a mixture thereof. Good. The polishing liquid 12 may be any one that can disperse the abrasive grains 11 and act freely on the processed surface, but is preferably an oil-based one such as hydrocarbon oil in order to suppress oxidation of the cast iron surface. The surface plate 13 only needs to have the ability to cause the abrasive grains 11 to act freely on the sliding member, which is a workpiece, such as pure tin, pure copper, tin alloy, copper alloy, cast iron, or the like. It is possible to use one having a polishing pad made of nonwoven fabric or polyurethane on the surface.

  As the polishing process with the loose abrasive proceeds, as shown in FIG. 2 (c), the lipophilic substance 9 made of graphite is more easily processed than the cast iron that is the material of the sliding member 8. On the other hand, the surface of the lipophilic substance 9 made of graphite is recessed to form a recess 14. The shape of the recess 14 varies depending on the average particle diameter of the abrasive grains 11 in FIG. When the average particle diameter of the abrasive grains 11 is larger than the average diameter of the lipophilic substance 9 made of graphite, since the abrasive grains 11 do not enter the recesses 14, the opening diameter of the recesses is equal to or larger than the inside. On the other hand, when the average particle diameter of the abrasive grains 11 is smaller than the average diameter of the lipophilic substance 9 made of graphite, the abrasive grains 11 enter the recesses 14 and act so as to scrape out the internal graphite.

  FIG. 4 is a cross-sectional view of the sliding member 8 processed using abrasive grains 11 having an average particle size smaller than the average diameter of the lipophilic substance made of graphite. As shown in FIG. 4, when processing is performed using abrasive grains 11 having an average particle size smaller than the average diameter of the lipophilic substance made of graphite, the opening diameter (width) B of the recess 14 is set inside the recess 14. The shape is smaller than the diameter (width) C. Since the opening diameter is smaller than the inside of the recess 14, the lubricating oil that has entered the recess becomes a sliding surface little by little over a long period of time when the supply of the lubricating oil is delayed, compared to the one with a wide opening diameter of the recess. Since it is supplied, it is possible to extend the time until seizure.

  For example, when the average diameter of graphite of spheroidal graphite cast iron is 40 μm and the average particle diameter of the abrasive grains 11 is larger than 40 μm, the opening diameter of the recesses is larger than the inside and smaller than 40 μm is used. If so, the opening diameter of the recess can be made smaller than the inside. In order to reliably control the opening diameter of the concave portion, it is preferable that the average particle diameter of the abrasive grains 11 is 10 μm or more larger or smaller than the average diameter of graphite. Moreover, since the graphite particle diameter of spheroidal graphite cast iron varies depending on variations in manufacturing conditions and the like, it is preferable to adjust the average particle diameter of the abrasive grains 11 according to the spheroidal graphite cast iron material.

  FIG. 5 is a plan view of the sliding surface shown in FIG. The lipophilic substance 9 made of graphite is substantially circular and randomly arranged when viewed from the top with respect to the sliding surface 10. The size of the lipophilic substance 9 made of graphite varies, and in the present invention, the average value is used for the size of the lipophilic substance 9 made of graphite. Although not shown here, the lipophilic substance 9 made of graphite has a concave shape.

  In this embodiment, in the manufacturing method of the sliding part in which the recess of the sliding surface is provided with the lipophilic substance and the lipophilic substance is recessed from the sliding surface, the recess is formed on the sliding surface, and then the lipophilic substance is formed. An example of a method for manufacturing a sliding component in which a lipophilic substance is disposed so as to cover the recess by forming the substance in the recess and then removing the lipophilic substance formed on the sliding surface will be described.

  FIG. 6 is a process diagram for explaining the manufacturing process of the sliding component according to the second embodiment of the present invention. FIG. 6 (a) shows the state after the concave portion of the sliding surface is formed. b) shows a state in which an oleophilic member is formed in the recess, and FIG. 5 (c) shows a state in which the oleophilic material formed other than the recess is removed.

  In FIG. 6A, a recess 17 is formed on the sliding surface 16 of the sliding member 15. The sliding member 15 can be made of cast iron, wrought iron, stainless steel, phosphor bronze, or the like. The concave portion 17 is formed by a method of transferring a shape by pressing a spherical tool or the like against the sliding surface, laser processing, or the like. The recess 17 is not limited to a circle when viewed from the top of the sliding surface 16, and may be an ellipse or a rectangle such as a square. Moreover, even if arrange | positioned at random with respect to the plane direction of the sliding face 16, you may arrange | position regularly at a fixed space | interval. Moreover, the cross-sectional shape of the concave portion 17 is not limited to a hemisphere, and the bottom surface and the side surface of the concave portion 17 may intersect with each other in a shape close to a straight line. The size of the concave portion 17 is preferably 20 μm or more in the plane direction of the sliding surface in order to retain the lubricating oil and secure the wear powder. The depth of the recess is determined in consideration of the thickness of the lipophilic substance so that the recess is at least 5 μm in a state where the lipophilic substance is formed inside.

  In FIG. 6B, the lipophilic substance 18 is formed in the recess 17. As long as the lipophilic substance 18 has good compatibility with the lubricating oil, there is no problem, and graphite, DLC, CNT, or the like can be used. For example, when DLC is used as a lipophilic substance, a plasma CVD apparatus is used to provide a sliding member having a concave portion formed on a sliding surface on a temperature-adjustable electrode that is subjected to high frequency in a vacuum vessel. The DLC can be formed on the sliding surface including the concave portion by lowering the pressure of the vacuum vessel, introducing hydrocarbon gas and hydrogen gas, etc., and generating plasma by applying high frequency. Although the thickness of the DLC can be controlled by adjusting the film formation time or the like, it is sufficient that the DLC that is familiar with the lubricating oil can be formed in the recess, and there is no problem if the DLC is about 50 nm or more. Further, graphite and CNT are formed by CVD, vapor deposition, sputtering, ion plating, or the like.

  Further, in FIG. 6B, the lipophilic substance is formed on the entire surface, but the step of removing the lipophilic substance formed other than the recess is omitted by selectively forming the lipophilic substance in the recess. May be. For example, when DLC is used as the lipophilic substance, a DCL can be selectively formed in the concave portion by depositing a metal mask or the like having an opening corresponding to the concave portion of the sliding surface on the sliding surface. Is possible.

  FIG. 6C shows a state after removing the lipophilic substance 18 formed other than the recesses in FIG. 6B. As a method for removing the lipophilic substance 16 formed in the shape of the sliding surface 14, for example, a polishing process using free abrasive grains is performed. The basic structure of the polishing process is the same as that described in the second embodiment, but the abrasive grains having a small grain size are used so that the lipophilic substance 18 formed in the recess is not processed as much as possible. . The particle size is preferably 0.5 μm or less.

  In this example, in the manufacturing method of the sliding part in which the recess of the sliding surface is provided with the lipophilic substance and the lipophilic substance is recessed from the sliding surface, the opening width in the sliding surface compared to the internal width. After forming a narrow recess, the lipophilic substance is formed on the entire sliding surface including the recess, and then the lipophilic substance formed on the sliding surface is removed so that the lipophilic substance covers the recess. An example of a method for manufacturing a sliding component having a recess which is arranged and whose opening width is narrower than the internal width will be described.

  FIG. 7 is a process diagram for explaining the manufacturing process of the sliding component according to the third embodiment of the present invention. FIG. 7 (a) shows the state after the concave portion of the sliding surface is formed. b) shows a state in which an oleophilic member is formed in the recess, and FIG. 5 (c) shows a state in which the oleophilic material formed other than the recess is removed.

  In FIG. 7A, a recess 21 is formed on the sliding surface 20 of the sliding member 19. The sliding member 19 can be made of cast iron, wrought iron, stainless steel, phosphor bronze, or the like. The recess 21 is processed by swinging the tip of the tool while rotating a drill or the like, thereby forming a recess shape having a smaller opening diameter than the inside on the sliding surface 20. The recess 21 is circular when viewed from the top of the sliding surface 20. Moreover, even if it arrange | positions at random with respect to the plane direction of the sliding face 20, you may arrange | position regularly at fixed intervals. The size and depth of the concave portion 21 is preferably 20 μm or more in the plane direction of the sliding surface in order to retain the lubricating oil and secure the wear powder, as described in the third embodiment, and the depth of the concave portion 21. The depth is determined in consideration of the thickness of the lipophilic substance so that the dent is at least 5 μm with the lipophilic substance formed inside.

  In FIG. 7B, the lipophilic substance 22 is formed in the recess 21. For the lipophilic substance 22, the same material as in Example 2 can be used. The lipophilic substance 22 is formed on the entire surface including the inside of the recess 21 having the inside wider than the opening width and the sliding surface 20 by oblique sputtering or the like.

  FIG. 7C shows a state after removing the lipophilic substance 18 formed in the portion other than the concave portion in FIG. In the same manner as described in the third embodiment, the lipophilic substance 22 on the sliding surface 20 other than the recess 21 is removed. Since the opening width of the concave portion is smaller than the width inside the concave portion as described in the second embodiment, the lubricating oil that has entered the concave portion has a larger opening when the supply of the lubricating oil is delayed. Therefore, the time until the lubricating oil is consumed can be extended and the time until seizure can be extended.

  As described above, as in the example described in the embodiment of the present invention, according to the present invention, the concave portion formed on the sliding surface is provided with the lipophilic substance, and the concave portion is recessed by at least 5 μm, so that the lubricating oil is contained in the concave portion. When the high load is applied to the sliding part and it becomes difficult to supply the lubricating oil from the outside to the sliding surface, the dent lubricating oil acts effectively and seizes. Since the wear powder of the sliding member generated during operation can be suppressed by this recess, wear of the sliding surface due to the biting of the wear powder can be suppressed. In addition, when the opening width of the recess is smaller than the inner width of the recess, the lubricating oil that has entered the recess has a longer opening time than the wide opening when the supply of lubricating oil is delayed. Since it is supplied to the sliding surface little by little, the time until the lubricating oil is consumed can be extended, and the time until seizure can be extended.

  In this example, in the manufacturing method of the sliding component in which the concave portion is provided on the sliding surface, after the concave portion is formed on the sliding surface, a protective film is provided on the sliding surface, and a fine surface is selectively formed on the surface of the concave portion. An example of a method for manufacturing a sliding component having fine unevenness on the surface of the recess by forming the unevenness and then removing the protective film on the sliding surface will be described.

  FIG. 8 is a process diagram for explaining the manufacturing process of the sliding component according to the fourth embodiment of the present invention. FIG. 8 (a) shows the state after the concave portion of the sliding surface is formed. b) shows a state in the middle of forming fine irregularities on the surface of the recess, and FIG. 7 (c) shows a state where the protective film on the sliding surface is removed.

  In FIG. 8A, a recess 25 is formed on the sliding surface 24 of the sliding member 23. The sliding member 23 is made of the same material as described in the second embodiment, and the recess 25 is formed in the same manner as described in the second embodiment.

In FIG. 8B, after forming the protective film 26 on the sliding surface 24, the particles 27 are made to collide with the surface of the concave portion 25 by sandblasting or the like to form fine irregularities on the surface of the concave portion 25. The protective film 27 is opened at a position corresponding to the recess 25, and acts to prevent the sliding surface 24 from being processed when forming fine irregularities on the surface of the recess 25. The protective film 26 is made of a photoresist such as a thermosetting resin or a photocurable resin. The particle 27 forms fine irregularities on the surface of the recess 25, and needs to be sufficiently smaller than the opening width of the recess 25, and particles such as SiC or AL ₂ O ₃ having an average particle diameter of 1 μm or less are used. Is preferred.

  FIG. 8C shows a state after removing the protective film 26 formed on the sliding surface 24 in FIG. 8B. A fine unevenness 28 is formed on the surface of the recess 25. By providing the fine irregularities 28 on the surface of the concave portion 25, the surface area of the concave portion 25 is increased, and the lubricating oil enters the concave portion of the fine irregularities on the concave surface, so that the lubricating oil is retained compared to the concave portion having no fine irregularities. Can be improved.

  As a result, by providing the sliding surface with a recess having good lubricity retention, the same effect as the examples described so far can be obtained, and the sliding surface can be prevented from being seized and the abrasion of the sliding surface caused by biting of wear powder. It becomes possible to suppress.

  The sliding component obtained in the present embodiment can be applied to, for example, a hydraulic device represented by a compressor, a hydraulic pump, a hydraulic motor, and the like.

  FIG. 9 is a schematic view of the orbiting scroll component of the scroll compressor as an example of the sliding component of the present invention. The orbiting scroll component 29 is composed of an end plate surface 30, a spiral wrap 31 and a blade edge surface 32 at the end thereof. The cutting edge surface 32 shown by hatching is a sliding surface, and by providing a structure having a recess according to the embodiment of the present invention, seizure suppression and wear resistance of the sliding surface are improved and long-term stability is achieved. A scroll compressor having the characteristics can be provided.

  Here, the scroll compressor will be described.

  A scroll compressor compresses a pair of identical spiral-shaped sliding parts by reducing the volume of a compression chamber by fixing one and rotating the other (relatively swinging). Is. That is, air is sucked from the suction port outside the fixed scroll (fixed scroll), and the air enclosed in the compression space is compressed toward the center of the vortex by the reduction of the compression chamber accompanying the swirling motion. To go. The compressed air becomes the minimum at the center of the spiral, and the air is compressed to the highest level and discharged to the outside from the discharge port at the center. This process of suction, compression, and discharge is continuously repeated to produce compressed air.

  The fixed scroll and the orbiting scroll are revolving at high speed with the sliding surfaces facing each other, and the structure of the present invention can suppress seizure of the sliding surface and improve wear resistance.

  FIG. 10 is a cross-sectional view of a hydraulic device which is an example having the sliding component of the present invention as a constituent member. The pump casing 33 includes a main casing 33a and a front casing 33b. The main casing 33a is joined and fixed to the front casing 33b. A rotation shaft 35 that is connected through the center of the cylinder block 34 is provided. The rotation shaft 35 is rotatably supported by bearings 36 and 37 on the main body casing 33a and the front casing 33b, respectively. Further, a coupling member 38 is connected to the rotating shaft 35, and an output shaft of the engine is connected to the coupling member 38.

  The swash plate 39 controls the inclination angle of the swash plate 39 with respect to the rotary shaft 35 by the tilt angle control member 40 provided in the main body casing 33a, thereby determining the coating capacity of the hydraulic pump. A predetermined number of shoes 41 are mounted on the swash plate 39, and pistons 42 are connected to the shoes 41 via spherical joints. The piston 42 is inserted into a cylinder hole 43 formed in the cylinder block 34 so as to be able to reciprocate. The cylinder block 34 is provided with an odd number, for example, five or seven cylinder holes 43, and a piston 42 is inserted into each cylinder hole 43.

  A valve plate 44 is interposed between the cylinder block 34 and the main body casing 33a. The valve plate 44 is provided with a suction port 47 and a discharge port 48 communicating with the suction flow path 45 and the discharge flow path 46 provided in the main body casing 33a.

  When the rotary shaft 35 is rotationally driven by driving means (not shown), the cylinder block 34 connected to the rotary shaft 35 is rotationally driven. As the cylinder block 34 rotates, the piston 42 inserted into each cylinder hole 43 is driven to rotate about the axis of the rotation shaft 35. At this time, the shoe 41 connected to the piston 42 is moved on the surface of the swash plate 39. Slide. Here, when the swash plate 39 is inclined with respect to the rotation shaft 35, the piston 42 moves up and down in the cylinder hole 43 in accordance with the inclination angle, and the suction and discharge of oil are repeated to act as a pump. To do.

  A surface 49 facing the swash plate 39 of the shoe 41 is a sliding surface. By providing the structure which has a recessed part here based on embodiment of this invention, the hydraulic pump which has long-term stability can be provided.

DESCRIPTION OF SYMBOLS 1 ... 1st sliding member, 2 ... Sliding surface of 1st sliding member, 3 ... 2nd sliding member 4 ... Sliding surface of 2nd sliding member, 5 ... Lubricating oil, 6 ... Recessed portion 7 ··· Lipophilic material 8 · Sliding member 9 · Lipophilic material made of graphite 10 · Sliding surface · 11 · Abrasive grain · 12 · Polishing liquid 13 · Platen · 14 · Recessed portion · 15 · Sliding member 16. Sliding surface, 17: Recessed portion, 18: Lipophilic substance, 19: Sliding member, 20 ... Sliding surface, 21: Recessed portion, 22: Lipophilic substance, 23: Sliding member, 24 ... Sliding surface, 25: Recessed portion 26 ... Protective film, 27 ... Particles 28 ... Fine irregularities, 29 ... Orbiting scroll parts, 30 ... End plate surface 31 ... Wrap, 32 ... Blade face, 33 ... Pump casing 33a ... Main body casing, 33b ... Front casing 34 ... Cylinder block 35 ... Rotating shaft, 36 ... Bearing 37 ... Bearing, 38 ... Coupling part , 39 ... Swash plate 40 ... Tilt angle control part, 41 ... Shoe, 42 ... Piston 43 ... Cylinder hole, 44 ... Valve plate, 45 ... Suction passage 46 ... Discharge passage, 47 ... Suction port, 48 ... Discharge port 49. Face facing the swash plate of the shoe

Claims (13)

A sliding component having a pair of sliding surfaces that slide against each other in a plane,
A sliding part, wherein a concave portion is formed on at least one sliding surface, and a lipophilic substance is formed so as to cover the inner surface of the concave portion. The sliding component according to claim 1,
The sliding part, wherein the lipophilic substance is a carbon atom-containing inorganic substance. In the sliding component according to claim 2,
The sliding component, wherein the carbon-containing inorganic material is any of graphite, diamond-like carbon, and carbon nanotube. The sliding component according to claim 1,
A sliding component characterized in that the surface of the lipophilic substance is recessed by 5 μm or more with respect to the surface of the sliding surface so as to cover the inner surface of the recess. The sliding component according to claim 1,
A sliding component characterized in that the pair of sliding surfaces are sliding surfaces of a sliding component of a compressor. The sliding component according to claim 1,
A sliding component, wherein the pair of sliding surfaces are sliding surfaces of a sliding component of a hydraulic device. A method of manufacturing a sliding component having a pair of sliding surfaces that slide against each other in a plane,
At least one sliding surface of the pair of sliding surfaces is formed by polishing a surface of cast iron in which an oleophilic substance is contained by using free abrasive grains. . In the manufacturing method of the sliding components according to claim 7,
The method for producing a sliding component, wherein the lipophilic substance is a carbon atom-containing inorganic substance. In the manufacturing method of the sliding component of Claim 8,
A method for producing a sliding component, wherein the inorganic substance containing a pre-carbon atom is made of graphite. In the manufacturing method of the sliding components according to claim 7,
The method for producing a sliding component, wherein the loose abrasive has an average particle size of 30 μm or more. A method of manufacturing a sliding component having a pair of sliding surfaces that slide against each other in a plane,
At least one of the pair of sliding surfaces is formed by forming a recess on the surface of the sliding member and depositing a lipophilic substance so as to cover the inner surface of the recess. Manufacturing method of sliding parts. In the manufacturing method of the sliding components according to claim 11,
The method for producing a sliding component, wherein the lipophilic substance is a carbon atom-containing inorganic substance. In the manufacturing method of the sliding components according to claim 12,
The method for producing a sliding component, wherein the carbon-containing inorganic substance is any one of graphite, diamond-like carbon, and carbon nanotubes.

Images