US20090151552A1 - Shoe for compressors - Google Patents

Shoe for compressors Download PDF

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Publication number
US20090151552A1
US20090151552A1 US11/852,394 US85239407A US2009151552A1 US 20090151552 A1 US20090151552 A1 US 20090151552A1 US 85239407 A US85239407 A US 85239407A US 2009151552 A1 US2009151552 A1 US 2009151552A1
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United States
Prior art keywords
shoe
semi
base portion
spherical
sliding contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/852,394
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English (en)
Inventor
Takayuki Kato
Takahiro Sugioka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2006251008A external-priority patent/JP2008069747A/ja
Priority claimed from JP2006251012A external-priority patent/JP2008069748A/ja
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI reassignment KABUSHIKI KAISHA TOYOTA JIDOSHOKKI ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATO, TAKAYUKI, SUGIOKA, TAKAHIRO
Publication of US20090151552A1 publication Critical patent/US20090151552A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/0873—Component parts, e.g. sealings; Manufacturing or assembly thereof
    • F04B27/0878—Pistons
    • F04B27/0886—Piston shoes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/0873—Component parts, e.g. sealings; Manufacturing or assembly thereof
    • F04B27/0878—Pistons
    • F04B27/0882—Pistons piston shoe retaining means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • F04B27/1045—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • F04B27/1054—Actuating elements
    • F04B27/1063—Actuating-element bearing means or driving-axis bearing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/10—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B27/1036—Component parts, details, e.g. sealings, lubrication
    • F04B27/1081—Casings, housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/14—Control
    • F04B27/16—Control of pumps with stationary cylinders
    • F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B27/1804—Controlled by crankcase pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/12—Kind or type gaseous, i.e. compressible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/14—Refrigerants with particular properties, e.g. HFC-134a
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • F05B2260/962—Preventing, counteracting or reducing vibration or noise by means creating "anti-noise"
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S417/00—Pumps

Definitions

  • the present invention relates to a shoe for compressors.
  • a pair of longitudinal shoes for compressors can be provided between the swash plate and the piston.
  • the respective shoes comprise a base portion and a semi-spherical portion made integral with the base portion.
  • the base portion includes a swash-plate sliding contact surface in sliding contact with the swash plate.
  • the semi-spherical portion includes a bearing-seat sliding contact surface in sliding contact with a bearing seat, which is provided concavely on the piston.
  • General shoes are semi-spherical in shape such that a base portion and a semi-spherical portion are solid and integral with each other.
  • such shoes are manufactured by subjecting a wire material of, for example, SUJ2 (JIS G4805) to cutting, press working, polishing, etc.
  • shoes made lightweight by forming a cavity between a base portion and a semi-spherical portion are known (for example, JP-A-2005-90385, JP-A-2002-31051, JP-A-2-119686, JP-A-2002-39058, JP-A-2001-263225, JP-UM-A-6-40385).
  • shoes of this kind for compressors, in which a swash plate can be changed in inclination, it is possible to decrease a reciprocating inertial force of a piston, thus enabling achieving an improvement in capacity controllability.
  • shoes of this kind can realize reduction in motive power for driving of a compressor, lightening of the compressor, etc.
  • a swash-plate sliding contact surface of a base portion of a shoe comes into sliding contact with a surface of a swash plate and a bearing-seat sliding contact surface of a semi-spherical portion of the shoe comes into sliding contact with a bearing surface of a piston. Therefore, a force acting in a direction, in which the base portion and the semi-spherical portion approach each other, acts much on the shoe.
  • the shoes disclosed in JP-A-2002-31051, JP-A-2-119686, JP-A-2002-39058, JP-A-2001-263225, or JP-UM-A-6-40385 described above are hard to sustain the force and there is a fear of deformation in a direction, in which the base portion and the semi-spherical portion approach each other, due to use over a long term.
  • gap is generated between the swash plate and the base portion of the shoe, or between the semi-spherical portion of the shoe and a bearing seat of the piston to lead to generation of abnormal noise and an obstacle to smooth operation.
  • the invention has been thought of in view of the conventional situation and has its object to provide a shoe for compressors, in which lightening and practical strength can be made compatible with each other.
  • the invention provides a shoe for compressors, comprising a base portion having a swash-plate sliding contact surface in sliding contact with a swash plate and a semi-spherical portion made integral with the base portion and having a bearing-seat sliding contact surface in sliding contact with a bearing seat, which is in the form of a spherical surface and provided concavely on a piston.
  • a cavity is formed between the base portion and the semi-spherical portion of the shoe.
  • the base portion and the semi-spherical portion are connected to each other by a solid connecting portion, which passes through centers of the both portions and extends in a central direction of the both portions. Lightening of the shoe according to the invention is realized by the cavity formed between the base portion and the semi-spherical portion.
  • the shoe can ensure practical strength since the base portion and the semi-spherical portion are connected to each other by the solid connecting portion, which passes through centers of the both portions and extends in a central direction of the both portions, and the connecting portion sustains a force acting in a direction, in which the base portion and the semi-spherical portion are caused to approach each other.
  • the shoe according to the invention can make lightening and practical strength compatible with each other. Therefore, the shoe can perform effects of suppression of abnormal noise of a variable displacement type swash plate compressor, an improvement in durability, etc. in addition to effects of an improvement in capacity controllability of the compressor, reduction in motive power, lightening, etc.
  • FIG. 1 is a cross sectional view showing a compressor, in which shoes according to Embodiment 1 to Embodiment 10 are used.
  • FIG. 2 is a cross sectional view showing an essential part of the compressor of Embodiment 1.
  • FIG. 3 is a cross sectional view showing the shoe of Embodiment 1.
  • FIG. 4 relates to a method of manufacturing the shoe of Embodiment 1, FIG. 4(A) being a cross sectional view showing a press die, etc. before hot forging, and FIG. 4(B) being a cross sectional view showing the press die, etc. after hot forging.
  • FIG. 5 is a cross sectional view showing a shoe of Embodiment 2.
  • FIG. 6 is a cross sectional view showing a shoe of Embodiment 3.
  • FIG. 7 is a disassembled, cross sectional view showing the shoe of Embodiment 3.
  • FIG. 8 is a cross sectional view showing a shoe of Embodiment 4.
  • FIG. 9 is a disassembled, cross sectional view showing the shoe of Embodiment 4.
  • FIG. 10 is a cross sectional view showing a shoe of Embodiment 5.
  • FIG. 11 is a disassembled, cross sectional view showing the shoe of Embodiment 5.
  • FIG. 12 is a cross sectional view showing a shoe of Embodiment 6.
  • FIG. 13 is a disassembled, cross sectional view showing the shoe of Embodiment 6.
  • FIG. 14 is a cross sectional view showing a shoe of Embodiment 7.
  • FIG. 15 is a perspective view showing the shoe of Embodiment 7.
  • FIG. 16 relates to a method of manufacturing the shoe of Embodiment 7, FIG. 16(A) being a cross sectional view showing a press die, etc. before hot forging, and FIG. 16(B) being a cross sectional view showing the press die, etc. after hot forging.
  • FIG. 17 is a cross sectional view showing a shoe of Embodiment 8.
  • FIG. 18 is a perspective view showing the shoe of Embodiment 8.
  • FIG. 19 relates to a method of manufacturing the shoe of Embodiment 8 and is a cross sectional view showing a press die, etc. after hot forging.
  • FIG. 20 relates to a shoe of Embodiment 9, FIG. 20(A) being a disassembled, cross sectional view, and FIG. 20(B) being a cross sectional view.
  • FIG. 21 relates to a shoe of Embodiment 10, FIG. 21(A) being a disassembled, cross sectional view, and FIG. 21(B) being a cross sectional view.
  • variable displacement type swash plate compressor With the compressor, a front housing 2 is joined to a front end of a cylinder block 1 and a rear housing 4 is joined to a rear end of the cylinder block 1 through a valve unit 3 as shown in FIG. 1 .
  • Axial holes 1 a , 2 a extending in an axial direction are provided through the cylinder block 1 and the front housing 2 .
  • a drive shaft 5 is supported rotatably by the axial holes 1 a , 2 a with bearing devices, etc. therebetween.
  • lower and upper sides in FIG. 1 are defined as front and rear sides.
  • a crank chamber 6 is defined in the front housing 2 .
  • a lug plate 7 is fixed to the drive shaft 5 with a bearing device between itself and the front housing 2 .
  • a swash plate 8 formed on an outer peripheral side thereof with longitudinal, flat surfaces 8 a is provided rearwardly of the lug plate 7 in the crank chamber 6 .
  • the swash plate 8 has the drive shaft 5 extending therethrough and is varied in angle of inclination in this state by a link mechanism 9 provided between itself and the lug plate 7 .
  • a plurality of cylinder bores 1 b extending in the axial direction are provided concentrically through the cylinder block 1 .
  • One-head pistons 10 are accommodated in the respective cylinder bores 1 b to be able to reciprocate therein.
  • Neck portions are provided on side of the respective pistons 10 toward the crank chamber 6 and bearing seats 10 a in the form of a spherical surface are provided concavely on the neck portions of the respective pistons 10 to be opposed each other.
  • a pair of longitudinal shoes 21 are provided between the swash plate 8 and the respective pistons 10 .
  • the respective shoes 21 comprise a disk-shaped base portion 211 and a semi-spherical portion 212 made integral with the base portion 211 and having a semi-spherical outer surface.
  • An outer surface of the base portion 211 makes a circular swash-plate sliding contact surface 211 a in sliding contact with the swash plate 8 .
  • a peripheral edge of the swash-plate sliding contact surface 211 a is chamfered.
  • the outer surface of the semi-spherical portion 212 makes a spherical bearing-seat sliding contact surface 212 a in sliding contact with the bearing seat 10 a of the piston 10 .
  • the rear housing 4 is formed with a suction chamber 4 a and a discharge chamber 4 b.
  • the cylinder bores 1 b can be communicated to the suction chamber 4 a through a suction valve mechanism of the valve unit 3 and communicated to the discharge chamber 4 b through a discharge valve mechanism of the valve unit 3 .
  • a capacity control valve 11 is accommodated in the rear housing 4 .
  • the capacity control valve 11 is communicated to the suction chamber 4 a via a detection passage 4 c and causes an intake passage 4 d to provide communication or discommunication between the discharge chamber 4 b and the crank chamber 6 .
  • the capacity control valve 11 detects pressure in the suction chamber 4 a to change an opening degree of the intake passage 4 d to change a discharge capacity of the compressor.
  • an extraction passage 4 e provides communication between the crank chamber 6 and the suction chamber 4 a.
  • a condenser 13 , an expansion valve 14 , and an evaporator 15 are connected to the discharge chamber 4 b through a piping 12 , in order.
  • the evaporator 15 is connected to the suction chamber 4 a through the piping 12 .
  • a pulley 16 is provided rotatably at a front end of the front housing 2 with a bearing device therebetween, the pulley 16 being fixed to the drive shaft 5 .
  • a belt 18 rotationally driven by an engine 17 is wound round the pulley 16 .
  • cavity 213 is formed between the base portion 211 and the semi-spherical portion 212 of the shoe 21 .
  • the base portion 211 and the semi-spherical portion 212 are connected to each other by a solid connecting portion 214 , which passes centers of the portions and extends in a center direction of the portions.
  • the respective shoes 21 are manufactured in the following manufacturing method.
  • a solid material W composed of, for example, an iron material SUJ2 (JIS G4805) is prepared in a material forming process.
  • the material W includes a disk-shaped bottom portion W 1 , a disk-shaped umbrella portion W 2 being coaxial with the bottom portion W 1 and having a slightly smaller diameter than that of the bottom portion W 1 , and a shaft portion W 3 extending in a central direction of the bottom portion W 1 and the umbrella portion W 2 to connect between the bottom portion W 1 and the umbrella portion W 2 .
  • the material W may be formed by casting, or formed by press working, or cutting.
  • a press die P composed of an upper die P 1 and a lower die P 2 is prepared in the process of press working.
  • the upper die P 1 is formed with a semi-spherically concave forming surface P 11 , which matches with the bearing-seat sliding contact surface 212 a of the shoe 21 .
  • the lower die P 2 is formed with a forming surface P 21 , which matches with the swash-plate sliding contact surface 211 a of the shoe 21 .
  • a cavity C is defined by the forming surface P 11 and the forming surface P 21 .
  • the material W is subjected to hot forging with the use of the press die P.
  • the bottom portion W 1 of the material W makes the base portion 211
  • the umbrella portion W 2 makes the semi-spherical portion 212
  • the shaft portion W 3 makes the connecting portion 214 .
  • the manufacturing method it is possible to readily manufacture the shoe 21 , of which the base portion 211 and the semi-spherical portion 212 are made of the same material.
  • hot forging is also possible in multi-stage.
  • the shoe 21 can be also formed by subjecting a product after press working to surface polishing at need, or to tinning, surface coating such as DLC (Diamond Like Carbon), etc.
  • the drive shaft 5 rotates whereby the swash plate 8 rotates synchronously and the pistons 10 reciprocate in the cylinder bores lb through the shoes 21 .
  • compression spaces formed on head sides of the pistons 10 are varied in volume. Therefore, refrigerant gas in the suction chamber 4 a is sucked into the compression spaces to be compressed and then discharged into the discharge chamber 4 b.
  • a refrigerating action is performed in a refrigerating circuit composed of the compressor, the condenser 13 , the expansion valve 14 , and the evaporator 15 .
  • the shoe 21 brings the swash-plate sliding contact surface 211 a of the base portion 211 into sliding contact with the flat surface 8 a of the swash plate 8 and brings the bearing-seat sliding contact surface 212 a of the semi-spherical portion 212 into sliding contact with the bearing seat 10 a of the piston 10 .
  • the cavity 213 realizes lightening of the shoe 21 , it is possible to decrease a reciprocating inertial force of the piston 10 , thus enabling improving the compressor in capacity controllability. Also, the shoes 21 can realize reduction in motive power, by which the compressor is driven, lightening of the compressor, etc.
  • the shoes 21 demonstrate a practical strength since the base portion 211 and the semi-spherical portion 212 are connected to each other by the solid connecting portion 214 and the connecting portion 214 sustains a force acting in a direction, in which the base portion 211 and the semi-spherical portion 212 approach each other.
  • the shoes 21 enables making lightening and the practical strength compatible with each other, the shoes 21 make it possible to perform effects of suppression of abnormal noise of a variable displacement type swash plate compressor, an improvement in durability, etc. in addition to effects of an improvement in capacity controllability of the compressor, reduction in motive power, lightening of the compressor, etc.
  • the manufacturing method it is possible in the manufacturing method to perform a welding process of welding the base portion 211 and the semi-spherical portion 212 .
  • the base portion 211 and the semi-spherical portion 212 can be joined together firmly to appropriately bear a compressive reaction force, etc. in other regions than the connecting portion 214 .
  • opening 215 is formed on a shoe 22 of Embodiment 2 between a base portion 211 and a semi-spherical portion 212 .
  • the opening 215 is formed annularly round the base portion 211 .
  • the opening 215 communicates cavity 213 to an outside.
  • the remaining construction is the same as that of the shoe 21 of Embodiment 1.
  • the shoe 22 is used in the same compressor as that of Embodiment 1.
  • the shoe 22 is obtained by regulating the volume of the material W or the volume of the cavity C in the press die P in the manufacturing method of Embodiment 1.
  • a lubricating oil enters into the cavity 213 through the opening 215 and the lubricating oil is discharged outside from the opening 215 at need. Therefore, sliding contact between a swash-plate sliding contact surface 211 a of the base portion 211 and a surface 8 a of a swash plate 8 , and sliding contact between a bearing-seat sliding contact surface 212 a of the semi-spherical portion 212 and a bearing seat 10 a of a piston 10 are made smooth. Thereby, the capacity controllability of the compressor, an effect of reduction in motive power, etc. are improved.
  • the opening 215 may be plural and formed in appropriate number by partially connecting the base portion 211 and the semi-spherical portion 212 to each other.
  • the shoes 21 , 22 use SUJ2 as a material therefor in Embodiment 1 and Embodiment 2, aluminum alloys such as Al—Si alloy, etc. may be used as a material of the shoes.
  • a material of a connecting portion 214 is different from a material of a base portion 211 and a semi-spherical portion 212 .
  • the remaining construction is the same as that of the shoe 21 of Embodiment 1.
  • the shoe 23 is also used in the same compressor as that of Embodiment 1.
  • the shoe 23 is manufactured by the following manufacturing method.
  • a hollow body W 4 made of an aluminum alloy is prepared in a manufacturing process of the hollow body.
  • the hollow body W 4 is semi-spherical in external shape and includes a cavity 213 therein.
  • An insertion port 216 is formed at a top of the hollow body W 4 to communicate the cavity 213 to an outside.
  • a solid shaft portion W 5 made of SUJ2 described above is press fitted into the insertion port 216 .
  • the hollow body W 4 provides a base portion 211 and a semi-spherical portion 212 of the shoe 23 and the shaft portion W 5 provides a connecting portion 214 of the shoe 23 .
  • the shoe 23 of Embodiment 3 is obtained.
  • the shoe 23 can be made practical in strength by forming the connecting portion 214 from a highly stiff material.
  • the shaft portion W 5 may be produced from an aluminum alloy.
  • the shoe can be made high in strength by using the hollow body W 4 intact as a shoe.
  • a material of a semi-spherical portion 212 and a connecting portion 214 is different from that of a base portion 211 .
  • the remaining construction is the same as that of the shoe 21 of Embodiment 1.
  • the shoe 24 is also used in the same compressor as that of Embodiment 1.
  • the shoe 24 is manufactured according to the following manufacturing method.
  • a first member W 6 made of SUJ2 is prepared in a first-member manufacturing process.
  • the first member W 6 includes a cap-shaped head portion W 7 and a solid shaft portion W 8 extending inside from a top of the head portion W 7 .
  • a second disk-shaped member W 9 made of an aluminum alloy is prepared in a second-member manufacturing process.
  • a tip end of the shaft portion W 8 of the first member W 6 is press fitted into the recess 217 of the second member W 9 .
  • the head portion W 7 of the first member W 6 makes the semi-spherical portion 212 of the shoe 24
  • the shaft portion W 8 of the first member W 6 makes the connecting portion 214 of the shoe 24
  • the second member W 9 makes the base portion 211 of the shoe 24 .
  • a material of a semi-spherical portion 212 is different from a material of a base portion 211 and a connecting portion 214 .
  • the remaining construction is the same as that of the shoe 21 of Embodiment 1.
  • the shoe 25 is also used in the same compressor as that of Embodiment 1.
  • the shoe 25 is manufactured according to the following manufacturing method.
  • a first cap-shaped member W 10 made of SUJ2 is prepared in a first-member manufacturing process.
  • a second member W 11 made of SUJ2 is likewise prepared in a second-member manufacturing process.
  • the second member W 11 includes a disk-shaped bottom portion W 12 and a solid shaft portion W 13 extending vertically from a center of the bottom portion W 12 .
  • a tip end of the shaft portion W 13 is joined to a center of the first member W 10 by means of friction welding or the like.
  • the first member W 10 makes a semi-spherical portion 212 of the shoe 25
  • the bottom portion W 12 of the second member W 11 makes a base portion 211 of the shoe 25
  • the shaft portion W 13 of the second member W 11 makes a connecting portion 214 of the shoe 25 .
  • a material of a semi-spherical portion 212 , a material of a base portion 211 , and a material of a connecting portion 214 are different from one another.
  • the remaining construction is the same as that of the shoe 21 of Embodiment 1.
  • the shoe 26 is also used in the same compressor as that of Embodiment 1.
  • the shoe 26 is manufactured according to the following manufacturing method.
  • a first cap-shaped member W 14 made of an aluminum alloy is prepared in a first-member manufacturing process.
  • a second disk-shaped member W 15 made of a different aluminum alloy from that of the first member W 14 is prepared in a second-member manufacturing process.
  • a solid shaft portion W 16 made of SUJ2 is prepared in a shaft-portion manufacturing process.
  • one end of the shaft portion W 16 is joined to a top of the first member W 14 and the other end of the shaft portion W 16 is joined to a center of the second member W 15 .
  • the first member W 14 makes the semi-spherical portion 212 of the shoe 26
  • the second member W 15 makes the base portion 211 of the shoe 26
  • the shaft portion W 16 makes the connecting portion 214 of the shoe 26 .
  • the shoe 26 With the shoe 26 , materials of the base portion 211 , the semi-spherical portion 212 , and the connecting portion 214 are different from one another, so that freedom in choosing materials for a swash plate 8 and a piston 10 is widened to enable realizing a further excellent compressor. Also, by forming the connecting portion 214 from a highly stiff material, the shoe 26 can be made practical in strength.
  • a shoe 31 comprises ribs 314 provided upright on a semi-spherical portion 312 , an external surface of which is semi-spherical, on an opposite side of a bearing-seat sliding contact surface 312 a.
  • a base portion 311 is constituted by a peripheral edge of the semi-spherical portion 312 and tip ends of the ribs 314 .
  • the ribs 314 are formed to be cross-shaped to be equiangular at intervals of 90 degrees radially about centers of the base portion 311 and the semi-spherical portion 312 .
  • a solid connecting portion 314 a is formed centrally of the ribs 314 .
  • a swash-plate sliding contact surface 311 a of the base portion 311 is defined by the ribs 314 and cavities 313 are provided between the ribs 314 provided upright on the semi-spherical portion 312 .
  • the shoe 31 is also used in the same compressor as that of Embodiment 1.
  • the respective shoes 31 are manufactured according to the following manufacturing method.
  • a solid material W 17 made of, for example, an iron material SUJ2 (JIS G4805) is prepared in a material forming process by press working or casting.
  • the material W 17 is substantially semi-spherical.
  • a press die P 3 composed of an upper die P 4 and a lower die P 5 is prepared in the process of press working.
  • the upper die P 4 is formed with projections P 41 , which are used to form the ribs 314 on the shoe 31 and to form the cavities 313 between the ribs 314 .
  • Bottoms of the projections P 41 define a forming surface P 42 , which matches with the swash-plate sliding contact surface 311 a .
  • the lower die P 5 is formed with a forming surface P 51 , which matches with the bearing-seat sliding contact surface 312 a of the shoe 31 .
  • a clearance C 1 is defined by the forming surfaces P 42 , P 51 .
  • the material W 17 is subjected to hot forging with the use of the press die P 3 . Thereby, the material W 17 is deformed by pressing forces in a vertical direction to provide the shoe 31 of Embodiment 7.
  • the manufacturing method it is possible to readily manufacture the shoe 31 , of which the base portion 311 and the semi-spherical portion 312 are made of the same material.
  • hot forging is also possible in multi-stage.
  • the shoe 31 can be also formed by subjecting a product after press working to surface polishing at need, or to tinning, surface coating such as DLC (Diamond Like Carbon), etc.
  • the cavities 313 are provided between the ribs 314 on the back side of the semi-spherical portion 312 , lightening of the shoe 31 can be realized. Therefore, it is possible to decrease a reciprocating inertial force of the piston 10 , thus enabling improving the compressor in capacity controllability. Also, the shoes 31 can realize reduction in motive power, by which the compressor is driven, lightening of the compressor, etc.
  • the ribs 314 of the shoe 31 sustains a force acting in a direction, in which the base portion 311 and the semi-spherical portion 312 are caused to approach each other.
  • the connecting portion 314 a of the ribs 314 surely sustains the force. Therefore, the practical strength surely demonstrates itself even when a large force in a direction, in which the base portion 311 and the semi-spherical portion 312 in the compressor are caused to approach each other, acts much.
  • the shoes 31 enable making lightening and the practical strength compatible with each other and can be readily manufactured. Therefore, the shoes 31 make it possible to perform effects of suppression of abnormal noise of a variable displacement type swash plate compressor, an improvement in durability, etc. in addition to effects of an improvement in capacity controllability of the compressor, reduction in motive power, lightening of the compressor, etc. and to suppress an increase in manufacturing cost of the compressor.
  • a lubricating oil in the compressor enters into the cavities 313 between the ribs 314 and the lubricating oil is discharged between the swash-plate sliding contact surface 311 a of the base portion 311 and the surface 8 a of the swash plate 8 at need, so that sliding contact there becomes smooth.
  • a shoe 32 of Embodiment 8 comprises ribs 315 provided upright on a disk-shaped base portion 311 on an opposite side of a swash-plate sliding contact surface 311 a. Tip ends of the ribs 315 define a semi-spherical portion 312 . As shown in FIG. 18 , the ribs 315 are formed to be cross-shaped to be equiangular at intervals of 90 degrees radially about centers of the base portion 311 and the semi-spherical portion 312 . A solid connecting portion 315 a is formed centrally of the ribs 315 .
  • the bearing-seat sliding contact surface 312 a of the semi-spherical portion 312 is defined by the ribs 315 and cavities 313 are provided between the ribs 315 provided upright on the base portion 311 .
  • the remaining construction is the same as that of the shoe 31 of Embodiment 7.
  • the shoe 32 is also used in the same compressor as that of Embodiment 1.
  • the cavities 313 are provided between the ribs 315 on the front side of the base portion 311 , lightening of the shoe 32 can be realized by the cavities 313 . Also, with the shoe 32 , a lubricating oil in the compressor enters into the cavities 313 between the ribs 315 and the lubricating oil is discharged between the bearing-seat sliding contact surface 312 a of the semi-spherical portion 312 and a bearing seat 10 a of a piston 10 at need, so that sliding contact there becomes smooth.
  • the remaining actions and effects are the same as those in Embodiment 7.
  • the respective shoes 32 are manufactured according to the following manufacturing method.
  • a disk-shaped, solid material W 18 made of SUJ2 is prepared in a material forming process by press working or casting.
  • a press die P 6 composed of an upper die P 7 and a lower die P 8 is prepared in the process of press working.
  • the upper die P 7 is formed with a forming surface P 71 , which matches with the swash-plate sliding contact surface 311 a of the shoe 32 .
  • the lower die P 8 is formed with projections P 81 , which are used to form the ribs 315 on the shoe 32 and to form the cavities 313 between the ribs 315 .
  • Bottoms of the projections P 81 define a forming surface P 82 , which matches with the bearing-seat sliding contact surface 312 a.
  • a clearance C 2 is defined by the forming surfaces P 71 , P 82 .
  • the press die P 6 is used to subject the material W 18 to hot forging whereby the material W 18 is deformed by pressing forces in a vertical direction to provide the shoe 32 of Embodiment 8.
  • the manufacturing method also performs the same actions and effects as those of the manufacturing method in Embodiment 7.
  • materials in Embodiment 7 and Embodiment 8 are not limited to SUJ2 but an aluminum alloy like Al—Si alloy may be used as the material.
  • a shoe 33 of Embodiment 9 comprises a semi-spherical portion 316 and a base portion 317 .
  • the semi-spherical portion 316 includes a cap-shaped head portion 316 a having a bearing-seat sliding contact surface 316 c and ribs 316 b provided upright on the head portion 316 a on an opposite side of the bearing-seat sliding contact surface 316 c .
  • the ribs 316 b are formed to be cross-shaped to be equiangular at intervals of 90 degrees radially about a center of the semi-spherical portion 316 .
  • a solid connecting portion 316 d is formed centrally of the ribs 316 b.
  • the base portion 317 is disk-shaped to include a swash-plate sliding contact surface 317 b. Projections 317 a being fitted into tip ends of the ribs 316 b are protrusively provided on an upper surface of the base portion 317 .
  • the semi-spherical portion 316 and the base portion 317 can be manufactured by press working or casting or the like. As shown in FIG. 20(B) , in a process of fitting, the base portion 317 is fitted into the semi-spherical portion 316 while ensuring cavities 313 between itself and the semi-spherical portion 316 . Thus the shoe 33 of Embodiment 9 is obtained.
  • a material of the semi-spherical portion 316 is SUJ2 and different from a material of the base portion 317 , which comprises an aluminum alloy.
  • the remaining construction is the same as that of the shoe 31 of Embodiment 7.
  • the shoe 33 is also used in the same compressor as that of Embodiment 1.
  • a lubricating oil in the compressor enters into the cavities 313 through the openings and the lubricating oil is discharged outside from the openings at need, so that sliding contact between the swash-plate sliding contact surface 317 b of the base portion 317 and the surface 8 a of the swash plate 8 and between the bearing-seat sliding contact surface 316 c of the semi-spherical portion 316 and a bearing seat 10 a of a piston 10 are made smooth.
  • the remaining actions and effects are the same as those in Embodiment 7.
  • the manufacturing method it is possible to perform a welding process of welding the base portion 317 and the semi-spherical portion 316 together.
  • the base portion 317 and the semi-spherical portion 316 can be joined together firmly to appropriately bear a compressive reaction force, etc.
  • a shoe 34 of Embodiment 10 comprises a base portion 319 and a semi-spherical portion 318 .
  • the base portion 319 is disk-shaped to include a bottom portion 319 a having a swash-plate sliding contact surface 319 c and ribs 319 b provided upright on the bottom portion 319 a on an opposite side of the bearing-seat sliding contact surface 319 c .
  • the ribs 319 b are formed to be cross-shaped to be equiangular at intervals of 90 degrees radially about a center of the base portion 319 .
  • a solid connecting portion 319 d is formed centrally of the ribs 319 b.
  • the semi-spherical portion 318 is cap-shaped to have a bearing-seat sliding contact surface 318 b. Projections 318 a being fitted into tip ends of the ribs 319 b are protrusively provided on an inner surface of the semi-spherical portion 318 .
  • the base portion 319 and the semi-spherical portion 318 can be manufactured by press working or casting or the like. As shown in FIG. 21(B) , in a process of fitting, the semi-spherical portion 318 is fitted onto the base portion 319 while ensuring cavities 313 between itself and the base portion 319 . Thus the shoe 34 of Embodiment 10 is obtained.
  • a material of the base portion 319 is an aluminum alloy and different from a material of the semi-spherical portion 318 , which comprises SUJ2.
  • the remaining construction is the same as that of the shoe 31 of Embodiment 7.
  • the shoe 34 is also used in the same compressor as that of Embodiment 1.
  • the shoe 34 also performs the same actions and effects as those in Embodiment 7.
  • the base portions 317 , 319 of the shoes 33 , 34 are made of an aluminum alloy and the semi-spherical portions 316 , 318 are made of SUJ2 in Embodiment 9 and Embodiment 10, the base portions and the semi-spherical portions may be made of reverse materials to those in the former, or the both may be made of SUJ2 or an aluminum alloy.
  • solid means that no hole is formed centrally of a shaft cross section, and is opposed to “hollow”, which means that a hole is formed centrally of a shaft cross section.
  • the shoe, according to the invention including a base portion, a semi-spherical portion, and a connecting portion can be manufactured by the following first to fifth manufacturing methods.
  • the first manufacturing method comprises a material forming process of obtaining a solid material and a press working process of using a press die to subject the material to press working to obtain a shoe.
  • the shoe thus obtained includes a cavity formed between a base portion and a semi-spherical portion.
  • the base portion and the semi-spherical portion are connected to each other by a solid connecting portion, which passes centers of the base portion and the semi-spherical portion and extends in a central direction of the base portion and the semi-spherical portion.
  • the material is deformed to make the shoe.
  • the manufacturing method it is possible to readily manufacture the shoe, of which the base portion and the semi-spherical portion are made of the same material.
  • an integral material, one end side and the other end side of which are made of different materials, is used in the first manufacturing method, it is possible to manufacture a shoe, of which a base portion and a semi-spherical portion are made of different materials. It is possible to adopt hot forging as press working.
  • an opening can be formed between the base portion and the semi-spherical portion by adjusting a volume of a material and a volume of the cavity in press working.
  • the material forming process can comprise a process of forming a disk-shaped bottom portion, a disk-shaped umbrella portion, and a shaft portion, which connects between the bottom portion and the umbrella portion.
  • the process of press working uses a press die composed of an upper die and a lower die and subjects the umbrella portion to press working with the upper die while supporting the bottom portion on the lower die, whereby the bottom portion can make the base portion, the umbrella portion can make the umbrella portion, and the shaft portion can make the connecting portion.
  • the second manufacturing method comprises a hollow-body manufacturing process of obtaining a hollow body, which is semi-spherical in external shape and includes a cavity therein and is formed an insertion port to communicate the cavity to an outside at the top thereof, and an assembling process, in which the solid connecting portion is inserted into the insertion port such that the hollow body provides a base portion and a semi-spherical portion and the shaft portion provides a connecting portion, whereby a shoe is obtained.
  • the shoe thus obtained includes the cavity formed between the base portion and the semi-spherical portion.
  • the base portion and the semi-spherical portion are connected to each other by the connecting portion, which passes centers of the base portion and the semi-spherical portion and extends in a central direction of the base portion and the semi-spherical portion.
  • the hollow body provides the base portion and the semi-spherical portion of the shoe and the shaft portion provides the connecting portion of the shoe.
  • the second manufacturing method it is possible to make a material of the shaft portion different from that of the hollow body.
  • the shoe can be made further practical in strength by forming the connecting portion from a highly stiff material.
  • the third manufacturing method comprises a first-member manufacturing process of obtaining a cap-shaped head portion and a solid shaft portion extending inside from a top of the head portion, a second-member manufacturing process of obtaining a second disk-shaped member, and an assembling process, in which a tip end of the shaft portion is joined to a center of the second member such that the second member provides a base portion, the head portion provides a semi-spherical portion and the shaft portion provides the connecting portion, whereby a shoe is obtained.
  • the shoe thus obtained includes a cavity formed between the base portion and the semi-spherical portion.
  • the base portion and the semi-spherical portion are connected to each other by the connecting portion, which passes centers of the base portion and the semi-spherical portion and extends in a central direction of the base portion and the semi-spherical portion.
  • the head portion of the first member provides the semi-spherical portion of the shoe
  • the shaft portion of the first member provides the connecting portion of the shoe
  • the second member provides the base portion of the shoe.
  • the fourth manufacturing method comprises a first-member manufacturing process of obtaining a first cap-shaped member, a second-member manufacturing process of obtaining a second member composed of a disk-shaped bottom portion and a solid shaft portion extending from a center of the bottom portion, and an assembling process, in which a tip end of the shaft portion is joined to a center of the first member such that the bottom portion provides a base portion, the first member provides a semi-spherical portion and the shaft portion provides the connecting portion, whereby a shoe is obtained.
  • the shoe thus obtained includes a cavity formed between the base portion and the semi-spherical portion.
  • the base portion and the semi-spherical portion are connected to each other by the connecting portion, which passes centers of the base portion and the semi-spherical portion and extends in a central direction of the base portion and the semi-spherical portion.
  • the first member provides the semi-spherical portion of the shoe
  • the bottom portion of the second member provides the base portion of the shoe
  • the shaft portion of the second member provides the connecting portion of the shoe.
  • the fifth manufacturing method comprises a first-member manufacturing process of obtaining a first cap-shaped member, a second-member manufacturing process of obtaining a second disk-shaped member, a shaft-portion manufacturing process of obtaining a solid shaft portion, and an assembling process, in which one end of the shaft portion is joined to a top of the first member and the other end of the shaft portion is joined to a center of the second member such that the second member provides the base portion, the first member provides the semi-spherical portion and the shaft portion provides the connecting portion, whereby a shoe is obtained.
  • the shoe thus obtained includes a cavity formed between the base portion and the semi-spherical portion.
  • the base portion and the semi-spherical portion are connected to each other by the connecting portion, which passes centers of the base portion and the semi-spherical portion and extends in a central direction of the base portion and the semi-spherical portion.
  • the first member provides the semi-spherical portion of the shoe
  • the second member provides the base portion of the shoe
  • the shaft portion provides the connecting portion of the shoe. According to the manufacturing method, it is possible to readily manufacture a shoe, of which a semi-spherical portion, a base portion, and a connecting portion are made of different materials.
  • the first to fifth manufacturing methods comprise a welding process of welding the base portion and the semi-spherical portion together.
  • the base portion and the semi-spherical portion can be joined together firmly to appropriately bear a compressive reaction force, etc. in other regions than the connecting portion.
  • the shoe of the invention in which a swash-plate sliding contact surface is defined by ribs, can be manufactured by the following sixth manufacturing method.
  • the sixth manufacturing method comprises a material forming process of obtaining a solid material and a press working process of using a press die to subject the material to press working to obtain a shoe.
  • the shoe thus obtained includes a swash-plate sliding contact surface defined by ribs provided upright on a semi-spherical portion on an opposite side of a bearing-seat sliding contact surface.
  • a material is deformed by pressing forces in one direction to provide the shoe.
  • the manufacturing method it is possible to readily manufacture the shoe, of which the swash-plate sliding contact surface and the semi-spherical portion are made of the same material.
  • an integral material, one end side and the other end side of which are made of different materials, is used in the sixth manufacturing method, it is also possible to manufacture a shoe, of which the swash-plate sliding contact surface and a semi-spherical portion are made of different materials. It is possible to adopt hot forging as press working.
  • the material forming process can comprise a process of forming a solid, semi-spherical material by means of press working or casting.
  • a press die composed of an upper die and a lower die is used to support a material on the lower die, which matches a bearing-seat sliding contact surface, and to subject the material to press working with the upper die, which matches the ribs and the swash-plate sliding contact surface.
  • the shoe of the invention in which a bearing-seat sliding contact surface is defined by ribs, can be manufactured by the following seventh manufacturing method.
  • the seventh manufacturing method comprises a material forming process of obtaining a solid material and a press working process of using a press die to subject the material to press working to obtain a shoe.
  • the shoe thus obtained includes a bearing-seat sliding contact surface defined by ribs provided upright on a base portion on an opposite side of a swash-plate sliding contact surface.
  • the seventh manufacturing method also performs the same actions and effects as those in the sixth manufacturing method.
  • the material forming process can comprise a process of forming a solid, disk-shaped material by means of press working or casting.
  • a press die composed of an upper die and a lower die is used to support a material on the lower die, which matches ribs and a bearing-seat sliding contact surface, and to subject the material to press working with the upper die, which matches the swash-plate sliding contact surface.
  • the ribs are not limited to a cross shape, in which four ribs are provided radially, but can be formed so that plural, that is, three or more ribs are provided radially.
  • Compressors in which the shoes according to Embodiment 1 to Embodiment 10 are used, are not limited to the variable displacement type swash plate compressors described above but may comprise a fixed displacement type swash plate compressor.
  • Refrigerant gas need not be R134a but may be carbon dioxide.
  • the invention can be made use of in air conditioners for vehicles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
US11/852,394 2006-09-15 2007-09-10 Shoe for compressors Abandoned US20090151552A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2006251008A JP2008069747A (ja) 2006-09-15 2006-09-15 圧縮機用シュー及びその製造方法
JP2006-251008 2006-09-15
JP2006251012A JP2008069748A (ja) 2006-09-15 2006-09-15 圧縮機用シュー及びその製造方法
JP2006-251012 2006-09-15

Publications (1)

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US20090151552A1 true US20090151552A1 (en) 2009-06-18

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US11/852,394 Abandoned US20090151552A1 (en) 2006-09-15 2007-09-10 Shoe for compressors

Country Status (4)

Country Link
US (1) US20090151552A1 (fr)
EP (1) EP1906014A2 (fr)
KR (1) KR20080025347A (fr)
BR (1) BRPI0703911A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10794372B2 (en) 2016-09-30 2020-10-06 Taiho Kogyo Co., Ltd. Shoe for compressor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4732047A (en) * 1985-08-16 1988-03-22 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Structure of a shoe for a swash plate type compressor
US7313997B2 (en) * 2006-05-26 2008-01-01 Visteon Global Technologies, Inc. Copper alloy piston shoe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4732047A (en) * 1985-08-16 1988-03-22 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Structure of a shoe for a swash plate type compressor
US7313997B2 (en) * 2006-05-26 2008-01-01 Visteon Global Technologies, Inc. Copper alloy piston shoe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10794372B2 (en) 2016-09-30 2020-10-06 Taiho Kogyo Co., Ltd. Shoe for compressor

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EP1906014A2 (fr) 2008-04-02
KR20080025347A (ko) 2008-03-20
BRPI0703911A (pt) 2008-04-29

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