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WO2014188495A1 - Piston de moteur à combustion interne et procédé de fabrication de ce dernier - Google Patents

Piston de moteur à combustion interne et procédé de fabrication de ce dernier Download PDF

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Publication number
WO2014188495A1
WO2014188495A1 PCT/JP2013/063968 JP2013063968W WO2014188495A1 WO 2014188495 A1 WO2014188495 A1 WO 2014188495A1 JP 2013063968 W JP2013063968 W JP 2013063968W WO 2014188495 A1 WO2014188495 A1 WO 2014188495A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
outer peripheral
peripheral portion
film
heat insulating
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.)
Ceased
Application number
PCT/JP2013/063968
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English (en)
Japanese (ja)
Inventor
暁生 川口
学 立野
英男 山下
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 Motor Corp
Original Assignee
Toyota Motor 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
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to PCT/JP2013/063968 priority Critical patent/WO2014188495A1/fr
Publication of WO2014188495A1 publication Critical patent/WO2014188495A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/10—Pistons  having surface coverings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2251/00—Material properties
    • F05C2251/04—Thermal properties
    • F05C2251/048—Heat transfer

Definitions

  • the present invention relates to a piston for an internal combustion engine and a method for manufacturing the same, and more particularly to a piston for an internal combustion engine in which a heat insulating film is formed and a method for manufacturing the same.
  • Japanese Unexamined Patent Publication No. 2010-249008 Japanese Utility Model Publication No. 5-62569 Japanese Unexamined Patent Publication No. 2012-72745 Japanese Unexamined Patent Publication No. 2002-364369
  • a heat insulating film on the entire wall surface of the combustion chamber.
  • the upper surface is used as a reference surface for measuring the amount of protrusion from the upper end of the cylinder block after assembling the piston.
  • This reference surface is required not only when the piston is shipped but also during maintenance. For this reason, it is not desirable to use a heat insulating film whose height may change due to long-term use as a reference surface. Therefore, on the upper surface of the crown portion of the piston, it is required to secure a reference surface area separately from the heat insulating film formation area.
  • Patent Document 2 discloses a method in which a masking jig is provided on the piston main body portion excluding the top land portion of the piston and the groove portion of the top ring.
  • a heat insulation film will be formed in the side surface of a top land part.
  • the heat insulating film that is, the anodized film
  • the anodic oxide film is formed on the side surface, a piston having an enlarged outer diameter of the top land portion is formed.
  • the cylinder bore surface may be damaged by the anodic oxide film formed on the side surface.
  • an object of the present invention is to provide a new piston for an internal combustion engine and a method for manufacturing the same that can make the most of the characteristics of the heat insulating film while securing a region for a reference surface.
  • a first invention is a piston of an internal combustion engine in which a heat insulating film is formed
  • the piston includes an outer peripheral portion that forms an outer periphery of the crown surface, and a central portion that forms an inner side of the outer peripheral portion in the crown surface,
  • the heat insulating film is formed in the central portion,
  • the outer peripheral portion is provided with a region where the heat insulating film is not formed, The region includes a flat surface orthogonal to the piston axis above the central portion.
  • the second invention is the first invention, wherein
  • the piston further includes a valve recess formed from the central portion to the outer peripheral portion, The outer edge of the valve recess connected to the outer edge of the crown surface is provided with a region where the heat insulating film is not formed.
  • the third invention is the first or second invention, wherein
  • the heat insulating film is an anodized film having a thermal conductivity lower than the thermal conductivity of the piston base material and a heat capacity per unit volume lower than the heat capacity per unit volume of the piston base material.
  • a fourth invention is a method for manufacturing a piston of an internal combustion engine, An outer peripheral portion that forms the outer periphery of the crown surface, a central portion that forms the inner side of the outer peripheral portion on the crown surface, and a flat surface that is formed over the entire outer peripheral portion and that is orthogonal to the piston axis above the central portion. And a flat surface is masked by pressing an opening end of a hollow masking material thicker than a width of the flat surface in the radial direction of the piston against the flat surface.
  • the fifth invention is the fourth invention, wherein
  • the sealing treatment step is a step of sealing the oxide film while masking the flat surface with a hollow wide-mouth masking material having a wider opening end than the opening end. .
  • a heat insulating film can be formed in the central portion, and a flat surface on which the heat insulating film is not formed can be provided on the outer peripheral portion. Therefore, it is possible to provide a piston capable of making the most of the characteristics of the heat insulating film while ensuring this flat surface as a region for the reference surface.
  • the flat portion is masked with the masking material formed over the entire outer peripheral portion, the flat portion can be secured as a reference surface region. Further, it is possible to satisfactorily prevent the electrolytic solution from leaking to the side surface of the piston during the anodizing process and forming a heat insulating film on the side surface.
  • FIG. 6 is a view for explaining the structure of an anodized film 48. It is a figure for demonstrating the modification of embodiment. It is a figure for demonstrating an anodizing process. It is an expansion schematic diagram of the outer periphery of the crown part 14 during film forming process. It is a figure for demonstrating the conventional method of a film forming process. It is a figure for demonstrating a sealing process process. It is an expansion schematic diagram of the outer periphery of the crown part 14 during surface treatment.
  • the piston according to the present invention can be applied to either a diesel engine or a gasoline engine.
  • FIG. 1 is a perspective view of a piston according to the embodiment.
  • the piston 10 includes a cylindrical skirt portion 12 whose side surface is in sliding contact with an inner surface of a cylinder block (not shown), and a crown portion 14 having a predetermined thickness formed at the upper end portion of the skirt portion 12. And a pin boss portion 16 that supports a piston pin (not shown).
  • Three piston ring grooves 18, 20, and 22 are formed on the side surface of the crown portion 14.
  • the valve recesses 24 and 26 are formed with a larger capacity than the valve recesses 28 and 30.
  • a squish area 32 is formed in a substantially fan shape.
  • a squish area 34 is formed between the valve recesses 28 and 30.
  • the outer peripheral part 36 is formed in the crown surface along the outer periphery.
  • the outer peripheral part 36 is comprised from the flat part 36a orthogonal to a piston axis
  • the flat portion 36a constitutes the highest surface (top surface) of the crown surface.
  • the notch 36b constitutes the outer edge of the valve recesses 24 and 26, and is formed by cutting the flat portion 36a into an arc shape.
  • a tapered portion 38 is formed inside the outer peripheral portion 36.
  • the taper part 38 is comprised from the inclination part 38a and the notch part 38b.
  • the inclined portion 38a is a tapered surface whose diameter decreases as it goes downward from the crown surface side.
  • the notch 38b constitutes the outer edge of the valve recesses 24 and 26, and is formed by machining the inclined portion 38a into an arc shape. Note that the notches 36b and 38b are not formed at the locations where the valve recesses 28 and 30 are formed.
  • a bottom portion 40 that forms the lowermost surface of the crown portion 14 is formed on the crown surface.
  • the bottom portion 40 is connected to the tapered portion 38 directly and indirectly. That is, the bottom portion 40 is directly connected to the taper portion 38 at a location where the valve recesses 24, 26, 28, 30 and the inclined portions 42, 44 are not formed. At locations where the valve recesses 24, 26, 28, 30 and the inclined portions 42, 44 are formed, the bottom portion 40 is indirectly connected to the tapered portion 38 through these.
  • a frustoconical convex portion 46 is formed at the center of the bottom portion 40 so as to rise slightly from the inner peripheral side of the bottom portion 40.
  • an anodized film 48 is formed on the entire area of the crown surface excluding the flat portion 36a and the notches 36b and 38b.
  • FIG. 2 is an enlarged schematic view of a portion X in FIG. As shown in FIG. 2, the anodized film 48 is formed on the valve recess 26, the squish area 32, and the bottom 40. Further, the anodic oxide film 48 is formed on the inclined portion 38a but not on the notch 38b. This is because the notched portion 38b is formed by notching the inclined portion 38a together with the anodized film 48 after forming the anodized film 48 on the inclined portion 38a.
  • the anodized film 48 is not formed on the flat portion 36a and the cutout portion 36b. Since the notches 36b and 38b are formed at the same time, the notches 36b and 38b form a continuous surface. Similar to the periphery of the valve recess 26, an anodized film 48 is formed around the valve recess 24. That is, the anodic oxide film 48 is formed on the valve recess 24 and the inclined portion 38a, and the anodic oxide film 48 is not formed on the flat portion 36a and the notches 36b and 38b.
  • FIG. 3 is a view for explaining the structure of the anodic oxide film 48.
  • the anodic oxide film 48 includes an alumite film 48a and a sealing material 48b.
  • the alumite film 48a is a porous film formed by anodizing the aluminum alloy that is the base material of the piston 10, and has a thickness of 100 to 500 ⁇ m.
  • the sealing material 48b is provided for the purpose of suppressing thermal fatigue of the anodized film 48a by sealing the crack 48c formed on the upper surface of the anodized film 48a and the communication hole 48d formed therein.
  • a material preferably polysilazane in which a heat-resistant material such as silica acts as a main component after coating and curing is used.
  • the anodic oxide film 48 having the structure shown in FIG. 3 has a lower thermal conductivity and a lower heat capacity than an aluminum alloy, and has a lower heat conductivity and a lower heat capacity than a conventional ceramic heat insulating film. Therefore, the wall surface of the combustion chamber is not always kept at a high temperature as in the case of a ceramic heat insulating film, but it is possible to follow the gas temperature in the combustion chamber that varies between engine cycles. That is, the wall surface temperature of the combustion chamber can be lowered during the intake to compression stroke (up stroke in the case of a two-cycle engine) and high during the expansion to exhaust stroke (lower stroke in the case of a two-cycle engine). Therefore, according to the piston 10 on which the anodized film 48 is formed, not only the thermal efficiency of the engine but also the intake efficiency can be improved, so that it is possible to obtain effects such as improved fuel consumption and reduced NOx emission.
  • the anodic oxide film 48 is formed on the crown surface excluding the flat portion 36a and the notches 36b and 38b.
  • the flat portion 36a can be utilized as a reference surface for measuring the amount of protrusion from the upper end of the block after the piston is assembled.
  • the flat portion 36a can also be used as an area for marking maintenance information (pin diameter, bore diameter dimension rank, front mark) and manufacturing information (manufacturing date, bar code, QR code (registered trademark)) of the piston 10.
  • the notches 36b and 38b are not formed at the locations where the valve recesses 28 and 30 are formed. May be.
  • FIG. 4 is a diagram for explaining a modification of the embodiment.
  • the cross section of the inclined portion 38a may be curved in a convex shape or a concave shape. That is, the inclined portion 38a may partially protrude or be recessed.
  • the cross section of the inclined portion 38a may be inclined upward from the outer peripheral portion 36 side toward the center side of the crown portion 14. That is, the diameter of the inclined portion 38a may increase as it goes downward from the crown surface side.
  • FIG. 4 is a diagram for explaining a modification of the embodiment.
  • the cross section of the inclined portion 38a may be curved in a convex shape or a concave shape. That is, the inclined portion 38a may partially protrude or be recessed.
  • the cross section of the inclined portion 38a may be inclined upward from the outer peripheral portion 36 side toward the center side of the crown portion 14. That is, the diameter of the inclined portion 38a may increase as it goes downward from the crown surface side.
  • FIG. 4 is a diagram for explaining a modification of the
  • the inclined portion 38a may be parallel to the side surface of the crown portion 14 without being inclined.
  • the flat portion 36a is formed on the uppermost surface of the crown portion 14 and the anodic oxide film 48 is formed in the same region as in the above embodiment, the same effect as in the above embodiment can be obtained. Obtainable.
  • the upper surface of the crown portion 14 is the “crown surface” of the first invention
  • the outer peripheral portion 36 is the “outer peripheral portion” of the invention
  • 32, 34, the inclined portions 38a, 42, 44, the bottom portion 40, and the convex portion 46 are the "center portion” of the invention
  • the flat portion 36a is the "flat surface” of the invention
  • the anodized film 48 is the " It corresponds to “insulating film”.
  • the valve recesses 24, 26, 28, 30 correspond to the “valve recess” of the second invention
  • the notch 38b corresponds to the “outer edge” of the invention.
  • the method for manufacturing a piston according to the present embodiment is characterized by a method for forming the anodized film 48.
  • This forming method includes a step of anodizing the crown surface to form an alumite film 48a (anodizing treatment step), and a step of sealing the anodized film 48a to form a sealing material 48b (sealing treatment step). ).
  • the piston body itself is manufactured by casting from an aluminum alloy prior to the anodizing process, and the crown portions thereof include valve recesses 24, 26, 28, 30, squish areas 32, 34, an outer peripheral portion 36, and a tapered portion 38. Suppose that the bottom part 40 and the convex part 46 are formed.
  • the piston before forming the anodized film 48 is described as a “forged piston” in order to distinguish it from the finished piston 10.
  • the inclined portion 38a and the notch portion 36b are not distinguished from each other and will be described as the outer peripheral portion 36.
  • the inclined portion 38a and the cutout portion 38b are not distinguished from each other and will be described as the tapered portion 38.
  • FIG. 5 is a diagram for explaining the anodizing process.
  • a processing apparatus 60 is used in the anodizing process.
  • the processing device 60 includes an electrolyte flow path 62 for circulating the electrolyte and a pair of electrodes 64 and 66.
  • an opening 62a having a circular cross section in the horizontal direction is formed.
  • a masking material 68 is provided on the lower surface of the opening 62a.
  • the forged piston 90 is pressed against the masking material 68 while being held in the posture by the piston guides 70 and 72, and is set in the processing device 60. At this time, the position of the forged piston 90 is controlled so that the masking material 68 is pressed into the outer peripheral portion 36 to be recessed, and the outer peripheral portion 36 is thereby masked.
  • the electrolyte solution flow path 62 is filled with an electrolytic solution (aqueous solution of oxalic acid, sulfuric acid, etc.) while maintaining the masking state of the outer peripheral portion 36, the entire crown surface excluding the outer peripheral portion 36 (in FIG. 5, a tapered portion 38). , The bottom portion 40 and the convex portion 46) are in contact with the electrolytic solution. As indicated by arrows in the figure, the electrolytic solution is injected from one end of the electrolytic solution flow path 62 and sucked from the other end.
  • a film forming process is performed.
  • electrolysis is performed by applying a voltage between the electrodes 64 and 66, the upper surface of the crown portion 14 as an anode is oxidized to form an alumite film 48a.
  • the porosity of the alumite film 48a is adjusted to a desired value by the applied voltage, and the thickness of the alumite film 48a is adjusted by the application time.
  • the forged piston 90 is cooled to remove the oxidation reaction heat.
  • FIG. 6 is an enlarged schematic view of the outer periphery of the crown portion 14 during the film forming process.
  • the width of the masking material 68 in the piston radial direction is wider than that of the outer peripheral portion 36, and is partially recessed by being pressed against the outer peripheral portion 36.
  • the anodized film 48 a is formed on the inner side of the outer peripheral portion 36.
  • the outer peripheral portion 36 constitutes the uppermost surface of the crown portion 14, and the outer peripheral portion 36 constitutes a continuous surface before the formation of the notch portion 36b.
  • the tapered portion 38 forms a continuous surface.
  • the outer peripheral portion 36 and the tapered portion 38 constitute a weir together with the side surface of the crown portion 14. Therefore, if the outer peripheral portion 36 is masked with the masking material 68, the electrolyte solution is sealed inside the outer peripheral portion 36. Therefore, an alumite film 48 a is formed inside the outer peripheral portion 36.
  • FIG. 7 is a diagram for explaining a conventional method of film formation.
  • an alumite film can be formed on the entire top surface of the crown portion by performing a film forming process by bringing a masking material into contact with the side surface of the piston.
  • the electrolyte enters from between the masking material and the side surface of the piston during the film forming process.
  • the voltage application time takes several hours, so that the electrolytic solution easily enters. If it does so, the thickness of an alumite film will become inadequate, or an alumite film will be formed in the piston side surface, and a yield will fall.
  • a region where the alumite film 48a is not formed can be secured in the outer peripheral portion 36. Therefore, the outer peripheral part 36 can be secured as the reference surface. Even if the masking material 68 is worn or the like, the outer peripheral portion 36 can be reliably masked by adjusting the pressure from the piston guide 72 side. Therefore, the electrolytic solution can be reliably sealed and the alumite film 48 a can be formed in a desired region other than the outer peripheral portion 36.
  • FIG. 8 is a diagram for explaining the sealing treatment process.
  • the forged piston 90 is reversed. Thereby, the electrolytic solution remaining on the bottom 40 is discharged. Subsequently, as shown in FIG. 8 (ii), the forged piston 90 is washed around the film forming region of the crown portion 14 while being inverted, and then dried.
  • surface treatment is performed.
  • a masking material 80 having an opening having an annular cross section in the horizontal direction is used.
  • the surface treatment is performed by spraying the sealing material 48b from the opening side toward the bottom 40 side in a state where the outer peripheral portion 36 is masked by the masking material 80.
  • FIG. 9 is an enlarged schematic view of the outer periphery of the crown portion 14 during the surface treatment.
  • the masking material 80 is wider than the outer peripheral portion 36, and the inner wall 80 a of the opening is disposed along the inner edge of the outer peripheral portion 36 (the outer edge of the tapered portion 38). Therefore, the sealing material 48b is sprayed to a region further outside the outer edge of the anodized film 48a. Therefore, since the outer edge of the anodized film 48a can be covered with the sealing material 48b, gas inflow from the outer edge side into the anodized film 48a can be suppressed. Therefore, the thermal fatigue of the alumite film 48a can be satisfactorily suppressed.
  • the anodic oxide film 48 can be formed in a desired region other than the outer peripheral portion 36.
  • the piston guides 70 and 72 are removed from the forged piston 90, and a part of the outer peripheral portion 36 and the tapered portion 38 are cut to form notches 36b and 38b. Thereby, the piston 10 shown in FIG. 1 is manufactured.
  • the horizontal section of the opening 62a is annular.
  • the masking material 68 can be pressed against the outer peripheral portion 36, the outer peripheral portion 36 is masked. Therefore, as long as the outer peripheral portion 36 is masked, the cross-sectional shape of the masking material 68 can be variously modified.
  • the sealing material 48b is sprayed from below the masking material 80 while the forging piston 90 is inverted during the surface treatment of FIG. 8 (iii).
  • the forging piston 90 may be further inverted so that the bottom 40 faces upward, and the sealing material 48b may be sprayed from above the masking material 80.
  • the bottom 40 may be turned upward at the time of cleaning and drying in FIG. 8 (ii). That is, the direction of the forged piston 90 can be variously changed as long as the bottom 40 faces downward when discharging the electrolytic solution in FIG. For example, the anodizing process may be performed with the bottom 40 facing downward.
  • the masking material 68 is the “masking material” of the fourth invention
  • the alumite film 48 a is the “porous oxide film” of the invention
  • the anodized film 48 is the “heat insulation” of the invention.
  • Each corresponds to a “film”.
  • the masking material 80 corresponds to the “wide-mouth masking material” of the fifth invention.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

Selon l'invention, une partie périphérique externe (36) est formée sur la surface supérieure (la surface de couronne) d'une partie couronne (14), le long de la périphérie externe de cette dernière. La partie périphérique externe (36) est formée à partir d'une partie plate (36a) orthogonale à l'arbre de piston, et de parties encoche (36b). La partie plate (36a) constitue la surface positionnée de manière la plus élevée (la surface supérieure) de la surface de couronne. Une partie évasée (38) est formée sur l'intérieur de la partie périphérique externe (36). La partie évasée (38) est formée à partir d'une partie inclinée (38a) et de parties encoche (38b). Les parties encoche (38b) constituent la partie de bord externe de cavités de soupape (24, 26). Un film d'oxyde anodique (48) est formé sur la totalité de la surface de la surface de couronne, à l'exception de la partie plate (36a) et des parties encoche (36b, 38b).
PCT/JP2013/063968 2013-05-20 2013-05-20 Piston de moteur à combustion interne et procédé de fabrication de ce dernier Ceased WO2014188495A1 (fr)

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PCT/JP2013/063968 WO2014188495A1 (fr) 2013-05-20 2013-05-20 Piston de moteur à combustion interne et procédé de fabrication de ce dernier

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PCT/JP2013/063968 WO2014188495A1 (fr) 2013-05-20 2013-05-20 Piston de moteur à combustion interne et procédé de fabrication de ce dernier

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015019145A3 (fr) * 2013-08-05 2015-06-25 Toyota Jidosha Kabushiki Kaisha Moteur à combustion interne et procédé de fabrication correspondant
CN106817906A (zh) * 2015-09-30 2017-06-09 马自达汽车株式会社 发动机用活塞的制造方法
CN110462197A (zh) * 2017-04-04 2019-11-15 日产自动车株式会社 活塞

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS643797Y2 (fr) * 1982-11-29 1989-02-01
JPH0113794Y2 (fr) * 1981-05-28 1989-04-24
JPH0738807U (ja) * 1993-12-20 1995-07-14 株式会社ユニシアジェックス 内燃機関用ピストン
JP2009191674A (ja) * 2008-02-13 2009-08-27 Toyota Motor Corp 燃焼室構造
JP2012021467A (ja) * 2010-07-15 2012-02-02 Daihatsu Motor Co Ltd 内燃機関のピストン
JP2012189041A (ja) * 2011-03-14 2012-10-04 Toyota Central R&D Labs Inc ディーゼルエンジン
JP2013060620A (ja) * 2011-09-12 2013-04-04 Toyota Motor Corp 内燃機関とその製造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0113794Y2 (fr) * 1981-05-28 1989-04-24
JPS643797Y2 (fr) * 1982-11-29 1989-02-01
JPH0738807U (ja) * 1993-12-20 1995-07-14 株式会社ユニシアジェックス 内燃機関用ピストン
JP2009191674A (ja) * 2008-02-13 2009-08-27 Toyota Motor Corp 燃焼室構造
JP2012021467A (ja) * 2010-07-15 2012-02-02 Daihatsu Motor Co Ltd 内燃機関のピストン
JP2012189041A (ja) * 2011-03-14 2012-10-04 Toyota Central R&D Labs Inc ディーゼルエンジン
JP2013060620A (ja) * 2011-09-12 2013-04-04 Toyota Motor Corp 内燃機関とその製造方法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015019145A3 (fr) * 2013-08-05 2015-06-25 Toyota Jidosha Kabushiki Kaisha Moteur à combustion interne et procédé de fabrication correspondant
US9863312B2 (en) 2013-08-05 2018-01-09 Toyota Jidosha Kabushiki Kaisha Internal combustion engine and manufacturing method therefor
CN106817906A (zh) * 2015-09-30 2017-06-09 马自达汽车株式会社 发动机用活塞的制造方法
CN106817906B (zh) * 2015-09-30 2019-07-05 马自达汽车株式会社 发动机用活塞的制造方法
CN110462197A (zh) * 2017-04-04 2019-11-15 日产自动车株式会社 活塞
EP3608531A4 (fr) * 2017-04-04 2020-03-18 Nissan Motor Co., Ltd Piston
US10941727B2 (en) 2017-04-04 2021-03-09 Nissan Motor Co., Ltd. Piston

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