WO2018190167A1 - Piston de moteur à combustion interne et procédé de fabrication de piston de moteur à combustion interne - Google Patents

Piston de moteur à combustion interne et procédé de fabrication de piston de moteur à combustion interne Download PDF

Info

Publication number
WO2018190167A1
WO2018190167A1 PCT/JP2018/014067 JP2018014067W WO2018190167A1 WO 2018190167 A1 WO2018190167 A1 WO 2018190167A1 JP 2018014067 W JP2018014067 W JP 2018014067W WO 2018190167 A1 WO2018190167 A1 WO 2018190167A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
combustion engine
internal combustion
wear
manufacturing
Prior art date
Application number
PCT/JP2018/014067
Other languages
English (en)
Japanese (ja)
Inventor
圭太郎 宍戸
Original Assignee
日立オートモティブシステムズ株式会社
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 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Priority to CN201880019413.0A priority Critical patent/CN110446845A/zh
Publication of WO2018190167A1 publication Critical patent/WO2018190167A1/fr

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass pistons
    • 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 
    • 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
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/01—Pistons; Trunk pistons; Plungers characterised by the use of particular materials

Definitions

  • the present invention relates to a piston for an internal combustion engine.
  • the piston of an internal combustion engine has a piston head, and a wear resistant ring is fixed to the piston head, and a piston ring groove is provided in the wear resistant ring.
  • a wear resistant ring is fixed to the piston head, and a piston ring groove is provided in the wear resistant ring.
  • the wear-resistant ring member is set in a mold and the piston main body is cast, whereby the piston head A piston with a wear-resistant ring is manufactured.
  • This type of piston has room to improve the bondability between the wear-resistant ring and the piston body.
  • the piston of the internal combustion engine preferably has an intermediate layer containing aluminum between the piston body and the wear-resistant ring.
  • the intermediate layer further includes an additive that improves the wettability of the aluminum.
  • the piston of the internal combustion engine according to the embodiment of the present invention can improve the bondability between the wear resistant ring and the piston main body.
  • FIG. 1 schematically shows a cross section of a part of an engine taken along a plane passing through the axis of one cylinder of the first embodiment.
  • FIG. 2 is a perspective view of the piston of the first embodiment, showing a cross section cut by a plane passing through the axis of the piston.
  • FIG. 3 shows an enlarged part of a piston head portion in the piston cross section of FIG.
  • FIG. 3 is a diagram schematically showing a mold and a wear-resistant ring member installed in the mold in a step of casting the piston of the first embodiment, and shows a cross section cut by a plane passing through the axis of the wear-resistant ring member.
  • FIG. 3 is a view of a wear-resistant ring member installed in a mold and a part of the mold as viewed obliquely in the process of casting the piston of the first embodiment.
  • FIG. 3 is a cross-sectional view of a part of the alfin-treated abrasion resistant ring member according to the first embodiment, showing a cross section cut along a plane passing through the axis of the abrasion resistant ring member.
  • FIG. 5 is a cross-sectional view of an intermediate material before forming a piston groove in a step of machining the piston of the first embodiment, taken along a plane passing through its axis, and shows a part of the piston head portion in an enlarged manner.
  • An internal combustion engine (engine) 100 shown in FIG. 1 is a 4-stroke gasoline engine and is applied to a vehicle such as an automobile.
  • the engine 100 includes a piston 1, a cylinder block 101, a cylinder head 104, a connecting rod (connecting rod) 105, a combustion chamber 106, a valve 107, an ignition device 108, and an oil jet 109.
  • a crankshaft that is an output shaft of the engine is rotatably installed.
  • the cylinder block 101 includes a cylindrical cylinder sleeve (cylinder liner) 102.
  • the inner peripheral side of the cylinder liner 102 functions as an inner wall of the cylinder (cylinder bore) 10.
  • the piston 1 is accommodated in the cylinder 10 so as to be reciprocally movable.
  • the cylinder head 104 is installed in the cylinder block 101 so as to close the opening of the cylinder 10.
  • a combustion chamber 106 is defined between the piston 1 and the cylinder head 104.
  • the cylinder head 104 is provided with a valve 107, a fuel injection nozzle, and an ignition device 108.
  • the valve 107 has two intake valves and two exhaust valves.
  • the engine 100 includes a supercharging system such as turbocharging. Cooling water circulates in the passage 103 inside the cylinder liner 102.
  • the oil jet 105 is installed in the cylinder block 101 so that its nozzle faces the back surface of the piston 1 (surface opposite to the combustion chamber 106).
  • the piston 1 has a piston main body 2 and a wear-resistant ring 3.
  • the piston body 2 includes an aluminum alloy. This aluminum alloy is, for example, AC8A (specified in JIS H 5202, hereinafter the same).
  • the piston main body 2 has a bottomed cylindrical shape, and integrally includes a piston head (crown portion) 4, a piston boss (apron portion) 5, and a piston skirt (skirt portion) 6.
  • the piston head 4 has a crown surface portion 40 and a land portion 41 integrally.
  • the cross section of the piston head 4 (crown surface portion 40) cut along a plane orthogonal to the moving direction of the piston 1 inside the cylinder 10 is substantially circular.
  • a line passing through the center of the circle and parallel to the moving direction is referred to as an axis of the piston 1.
  • the direction in which the axis extends (the above moving direction) is referred to as the axis direction.
  • the crown surface portion 40 is on one side in the axial direction of the piston head 4.
  • the land portion 41 extends from the outer peripheral side of the crown surface portion 40 to the other side in the axial direction.
  • On the outer periphery of the land portion 41 there are three annular piston ring grooves (ring grooves) 411, 412, and 413.
  • Each ring groove 411, 412, 413 extends in the direction around the axis of the piston 1 (circumferential direction) and surrounds the entire circumference of the land portion 41.
  • the ring grooves 411, 412, 413 are arranged in this order from one side in the axial direction to the other side.
  • Each ring groove 411, 412, 413 is provided with a piston ring.
  • the ring groove 411 is a top ring groove, and a top ring 71 is installed as a first pressure ring (compression ring).
  • the ring groove 412 is a second ring groove, and a second ring 72 is installed as a second pressure ring.
  • the ring groove 413 is an oil ring groove, and an oil ring 73 is installed as an oil control ring.
  • An oil relief hole is opened at the bottom of the ring groove 413. The oil relief hole opens on the inner peripheral surface of the land portion 41.
  • the top ring 71 and the second ring 72 are formed of, for example, high carbon steel, martensitic stainless steel, or the like, and are flat plate members having a substantially C shape in plan view in which a joint is formed at one place in the circumferential direction.
  • the oil ring 73 has, for example, a three-piece structure in which two flat members are provided and a center ring is sandwiched between them.
  • Piston boss 5 and piston skirt 6 extend from piston head 4 (land portion 41) to the other side in the axial direction (opposite side of combustion chamber 15 with respect to piston head 4).
  • the inner peripheral sides of the piston skirt 6 and the piston boss 5 are hollow.
  • Each piston boss 5 has a pin boss 50.
  • Each pin boss 50 has a piston pin hole 51.
  • the piston pin hole 51 extends through the pin boss 50 in the radial direction of the piston 1.
  • the piston skirt 6 is sandwiched between the piston bosses 5 and 5 in the circumferential direction of the piston 1. Both piston skirts 6 and 6 are connected by a piston boss 5.
  • the end of the piston pin 8 is fitted into the piston pin hole 51.
  • the piston 1 is connected to one end side (small end portion) of the connecting rod 105 via the piston pin 8.
  • the other end side (large end portion) of the connecting rod 105 is connected to the crankshaft.
  • the wear-resistant ring 3 includes Ni-resist cast iron and is fixed to the inside of the piston head 4 (an installation site of the top ring 71 in the piston head 4).
  • the wear-resistant ring 3 is an annular member that surrounds the outer periphery of the piston head 4.
  • a line passing through the center of the circle of the ring and perpendicular to the plane including the ring is called the axis of the wear resistant ring 3.
  • the axis of the wear-resistant ring 3 substantially coincides with the axis of the piston 1.
  • the inner circumferential surface 31 of the wear-resistant ring 3 is a curved surface convex toward the axis of the wear-resistant ring 3 (inward in the radial direction), and a cross section cut by a plane passing through the axis is semicircular. Both side surfaces 32, 33 in the axial direction of the wear-resistant ring 3 have a planar shape perpendicular to the axis of the wear-resistant ring 3.
  • the outer circumferential surface 34 of the wear-resistant ring 3 is cylindrical, and its outer diameter dimension (distance from the axis of the wear-resistant ring 3) substantially matches the outer diameter dimension of the piston head 4 (distance from the axis of the piston 1). .
  • the outer peripheral surface 34 forms a part of the outer peripheral surface of the piston head 4 (is flush).
  • a ring groove 411 is opened at the center of the outer peripheral surface 34 in the height direction (the axial direction of the wear resistant ring 3).
  • the bottom surface of the ring groove 411 extends in the axial direction of the wear-resistant ring 3, and the inner surface other than the bottom surface of the ring groove 411 is substantially parallel to both side surfaces 32 and 33 in the axial direction of the wear-resistant ring 3.
  • the intermediate layer 30 includes an aluminum alloy and an additive.
  • the aluminum alloy is, for example, AC3A (specified in JIS H ⁇ 5202, hereinafter the same).
  • the additive includes sodium Na.
  • the proportion of the mass of Na in the intermediate layer 30 is 9 ppm or more and 1% or less. Note that the additive may contain a substance other than Na.
  • the manufacturing process of the piston 1 includes a wear-resistant ring member forming process, an alfin treatment process, a casting process, a heat treatment process, and a machining process.
  • the wear-resistant ring member forming step the base material of the wear-resistant ring 3 (the wear-resistant ring member 3A) is formed using Ni-resist cast iron as a material.
  • the shape of the wear-resistant ring member 3A is the shape of the wear-resistant ring 3 before the outer peripheral side (the outer peripheral surface 34 and the ring groove 411) is formed by machining.
  • the outer peripheral surface 34A of the wear resistant ring member 3A is cylindrical, and its outer diameter dimension (distance from the axis of the wear resistant ring member 3A) is slightly larger than the outer diameter dimension of the piston head 4.
  • the shape of the inner peripheral surface 31A of the wear resistant ring member 3A is the same as the shape of the inner peripheral surface 31 of the wear resistant ring 3.
  • Both side surfaces 32A, 33A in the axial direction of the wear resistant ring member 3A are slightly radially outward from both side surfaces 32, 33 in the axial direction of the wear resistant ring 3.
  • the mixed material includes an aluminum alloy AC3A and an additive (Na).
  • the ratio of the mass of Na in the mixed material is 9 ppm or more and 1% or less.
  • the surface of the wear resistant ring member 3A is alfined. That is, the wear resistant ring member 3A is immersed in the molten mixed material, and the surface of the wear resistant ring member 3A is covered with the mixed material.
  • a molecular bond is generated between AC3A and Niresist cast iron, and an alloy film 30A containing a compound of AC3A and Niresist cast iron is formed on the surface.
  • This film 30A contains Na.
  • the wear resistant ring member 3A on which the film 30A is formed is referred to as a member 300.
  • the prototype (intermediate material) of the piston body 2 is cast by the gravity casting method, and the wear resistant ring member 3A is cast into the intermediate material.
  • the mold includes a lower mold 91, an upper mold 92, and a core 93.
  • the lower mold 91 has a cylindrical portion 910.
  • the cylindrical portion 910 functions as a mold for the outer periphery of the intermediate material.
  • a stepped portion 911 is provided at the upper end of the cylindrical portion 910.
  • the upper die 92 closes the opening of the lower die 91 (cylindrical portion 910) and functions as a die on the crown surface portion 40 side of the intermediate material. As shown in FIG.
  • the core 93 is a sand mold (sand core), and functions as a mold on the inner circumference and the other side in the axial direction of the intermediate material.
  • the core 93 is installed in the lower mold 91.
  • the member 300 is installed on the step portion 911 of the lower mold 91.
  • the axis of the wear resistant ring member 3A substantially coincides with the axis of the cylindrical portion 910.
  • Both side surfaces 32A and 33A in the axial direction of the wear-resistant ring member 3A extend substantially horizontally and are substantially orthogonal to the axis of the cylindrical portion 910.
  • the upper mold 92 is installed on the lower mold 91.
  • the member 300 is sandwiched between the lower mold 91 (step 911) and the upper mold 92.
  • the molten metal for example, the molten aluminum alloy AC8A
  • the intermediate material in which the wear-resistant ring member 3A is cast on the outer peripheral side of the piston head 4 (original mold) is formed.
  • the alloy film 30A between the intermediate material (the prototype of the piston head 4) and the wear resistant ring member 3A is a future intermediate layer 30.
  • heat treatment In the heat treatment process, heat treatment is performed. Thereby, the property of the cast intermediate material is improved and adjusted to an appropriate strength and hardness.
  • the intermediate material is machined with a lathe.
  • the piston head 4 is cut to form a crown surface 400.
  • the outer diameter of the piston main body 2 such as the outer periphery of the piston head 4 and the piston skirt 6 is finished.
  • a part (outer peripheral side) of the wear resistant ring member 3A is cut together with the outer circumference of the piston head 4 to form a prototype 3B of the wear resistant ring 3.
  • the outer peripheral surface of the piston head 4 including the outer peripheral surface 34 of the prototype 3B as a part thereof is finished.
  • the piston pin hole 51 and the ring grooves 411 to 413 are formed by cutting (the ring groove 411 is formed in the master 3B).
  • the piston 1 (the wear resistant ring 3 and the piston main body 2) as shown in FIGS. 2 and 3 is completed.
  • the ring groove 411 may be formed in the wear-resistant ring member 3A before the casting process (after the alfin treatment process).
  • the crown surface 400 of the piston 1 is exposed to the combustion gas inside the combustion chamber 106.
  • the piston 1 reciprocates in the cylinder 10 by receiving the combustion pressure generated in the combustion chamber 106 during the expansion stroke on the crown surface 400. This reciprocating movement is converted into a rotational motion by the connecting rod 105 and output to the crankshaft.
  • the piston main body 2 includes the aluminum alloy AC8A, it is possible to reduce the weight of the piston 1 and improve the heat dissipation.
  • the piston rings 71 to 73 and the piston skirt 6 slide against the inner wall of the cylinder 10.
  • the heat transferred from the combustion chamber 106 to the piston head 4 is released by being transferred to the cylinder liner 102 and the cooling water therein through the piston ring 71 and the like.
  • the heat is also released when oil adheres to the inner peripheral side (back side) of the piston 1 and flows out. This oil adhesion is performed by, for example, the injection of oil from the oil jet 109.
  • the combustion pressure in the combustion chamber 106 is high because the engine 100 includes the supercharging system. In addition, if the engine 100 is intended to reduce fuel consumption and output, the temperature of the combustion chamber 106 increases.
  • the piston ring 71 and the like are also required to have high wear resistance, and the piston ring 71 and the like having high hardness are used. For example, since the high hardness piston ring 71 collides with the inner wall of the ring groove 411, the inner wall of the ring groove 411 is likely to be worn or deformed. On the other hand, the ring groove 411 is formed in the wear-resistant ring 3.
  • the wear-resistant ring 3 formed from Ni-resist cast iron has higher hardness (Rockwell hardness, Vickers hardness, etc.) than the piston body 2 formed from the aluminum alloy AC8A, and is excellent in wear resistance even at high temperatures. Therefore, wear and deformation of the inner wall of the ring groove 411 can be suppressed, and gas leakage and oil leakage through the outer periphery of the piston 1 can be suppressed.
  • the material of the wear-resistant ring 3 is not limited to Ni-resist cast iron, but may be any material that has higher hardness than the piston body 2 and excellent wear resistance. In the present embodiment, since the wear resistant ring 3 is made of Ni-resist cast iron, the linear expansion coefficient of the wear resistant ring 3 is close to that of aluminum (alloy AC8A), and an increase in thermal stress during engine operation can be suppressed.
  • the wear resistant ring member 3A As a pretreatment for the casting process of the piston 1, the wear resistant ring member 3A is immersed in a mixed material containing an aluminum alloy AC3A (alphine treatment). Thereby, the alloy film 30A is formed. Therefore, in the casting process, the wettability of the wear resistant ring member 3A (member 300) with the aluminum alloy AC8A that is the material of the piston main body 2 is improved. Compared to the case without the film 30A, the surface tension of the molten aluminum alloy AC8A in contact with the wear resistant ring member 3A (film 30A) is lowered. Since the adhesion between the molten metal and the wear resistant ring member 3A (member 300) is improved, the wear resistant ring member 3A is more firmly cast inside the piston main body 2.
  • Piston body 2 contains aluminum alloy AC8A. That is, the piston main body 2 has aluminum as a main component, like the alloy film 30A (intermediate layer 30). Thereby, since the adhesiveness between the piston main body 2 (molten metal) and the membrane 30A is further improved, better bonding can be obtained between the piston main body 2 and the wear resistant ring member 3A.
  • the alloy film 30A (intermediate layer 30) only needs to contain aluminum.
  • silicon Si may not be contained (pure aluminum may be used).
  • the film 30A (intermediate layer 30) is made of an aluminum alloy AC3A and contains silicon Si.
  • the melting point of the metal for the alfin processing becomes low because the aluminum that is the metal for the alfin processing contains Si. Therefore, better bonding can be obtained between the piston main body 2 and the wear resistant ring member 3A. That is, when the melting point of the alfin processing metal is high, in the casting process of the piston main body 2, the film 30A is partially solidified and is difficult to be combined with the piston main body 2 (molten metal).
  • the film 30A maintains a highly fluid (molten) state, and has the above-mentioned bowl shape. Hard to become. Therefore, the adhesion between the piston main body 2 (the molten metal) and the membrane 30A is further improved, so that a better bond can be obtained between the piston main body 2 and the wear resistant ring member 3A.
  • the thickness of the alloy film 30A (intermediate layer 30) is 1 mm or less. Therefore, the joint strength between the piston body 2 and the wear resistant ring member 3A can be improved. For example, if the member 300 is installed in the mold 91 and is gripped with a tool (scissors or the like), the gripped part of the membrane 30A is marked, and the joint property may be deteriorated at this part. If the thickness of the film 30A (intermediate layer 30) is 1 mm or less, such inconvenience can be remarkably suppressed. This inventor discovered this.
  • Alloy film 30A (intermediate layer 30) contains sodium Na as an additive to the metal for alfin processing.
  • Na has a function of improving the wettability of the aluminum alloy AC3A, that is, the wettability of the film 30A. Therefore, in the casting process, the wettability of the wear resistant ring member 3A (member 300) with the aluminum alloy AC8A that is the material of the piston main body 2 is further improved.
  • the surface tension of the film 30A in contact with the molten aluminum alloy AC8A is lowered. Since the adhesion between the molten metal and the wear resistant ring member 3A (member 300) is improved, the wear resistant ring member 3A is more firmly cast inside the piston main body 2.
  • Figure 8 shows an example in which Na was added to the metal for AC3A for the alphin treatment that covers the wear resistant ring member 3A in the alphin treatment process (the mass ratio of Na is 9 ppm to 12 ppm) and an example in which Na was not added to the AC3A.
  • the rate of occurrence of poor bonding between the wear-resistant ring 3 and the piston main body 2 (occurrence rate of individuals in which defects were recognized in the penetrant inspection after machining) is shown. In the case where Na was not added, the appearance rate of bonding failure was 25%, whereas in the case where Na was added, the appearance rate was about 2%.
  • FIG. 10 and 11 show experimental results in which a molten metal 13 of an aluminum alloy AC8A, which is a material of the piston main body 2, is poured into the test piece 14 of the wear resistant ring member 3A (member 300).
  • the test piece 14 in FIG. 10 is covered with an alfin-treating metal AC3A to which Na is not added.
  • the test piece 14 in FIG. 11 is covered with AC3A to which Na is added (the mass ratio of Na is 28 ppm).
  • the test piece 14 was placed on the pedestal 12 in a state of being inclined at a predetermined angle, and the molten metal 13 of AC8A was poured onto the pedestal 12 from above.
  • the molten metal 13 solidified while flowing in the direction indicated by the arrow 11.
  • the joining area of the molten metal 13 in the test piece 14 is about 60% larger.
  • the alloy film 30A (intermediate layer 30) of the wear resistant ring member 3A contains Na, the adhesion between the molten metal of the piston body 2 and the wear resistant ring member 3A (member 300) is improved. Occurrence of poor bonding of the wear resistant ring 3 can be suppressed.
  • the film 30A (AC3A, which is an alfin processing metal) covering the wear resistant ring member 3A installed in the mold 91 or the like maintains a molten high temperature state. Therefore, even if a flux is applied to the surface of the film 30A, the flux evaporates at a high temperature and is difficult to apply.
  • the flux is not applied to the surface of the film 30A, but an additive (Na) is included in the material of the film 30A. Therefore, in the casting process, the wettability of the film 30A can be improved even if the wear resistant ring member 3A (member 300) installed in the mold 91 or the like is in a high temperature state.
  • the casting method of the piston 1 is not limited to the gravity casting method, and may be a low pressure casting method or the like. Further, the specific configuration of the mold is not limited to that of the present embodiment.
  • the additive of the alloy film 30A may be any surface active element of aluminum (alloy) that is the material of the film 30A, that is, an element that reduces the surface tension of the molten aluminum (alloy).
  • the additive contains Na. Na is highly effective in reducing the surface tension of molten aluminum among the above elements. Therefore, sufficient wettability can be easily obtained with a smaller amount of additive.
  • the mass ratio of the additive, Na, in the intermediate layer 30 (alloy film 30A) is 9 ppm or more.
  • the wettability of aluminum (alloy AC3A) that is, the wettability of the membrane 30A is sufficiently improved, and the wear resistance between the material of the piston body 2 (AC8A)
  • the wettability of the ring member 3A (member 300) can be sufficiently improved. This inventor discovered this.
  • the mass ratio in the intermediate layer (alloy film 30A) of Na as an additive is 1% or less.
  • the upper limit of the ratio of Na as described above, it is possible to suppress a situation in which the structure of the intermediate layer 30 is chemically changed and becomes brittle. This inventor discovered this. As a result, it is possible to suppress a decrease in the bondability between the piston body 2 and the wear resistant ring 3.
  • the configuration will be described.
  • members and structures common to the first embodiment are denoted by the same reference numerals as in the first embodiment, and description thereof is omitted.
  • the molten magnesium alloy is poured into a mold (where the wear resistant ring member 3A is disposed).
  • the intermediate material of the piston main body 2 is cast. Therefore, the piston main body 2 includes a magnesium alloy.
  • the mixed material in the Alfin treatment step contains pure aluminum and sodium Na as an additive. Therefore, the intermediate layer 30 includes pure aluminum and an additive (Na).
  • Other configurations and manufacturing steps are the same as those in the first embodiment.
  • the piston body 2 includes a magnesium alloy, the weight of the piston 1 can be reduced.
  • the wear-resistant ring 3 formed from Ni-resist cast iron has a higher hardness than the piston main body 2 formed from a magnesium alloy. Therefore, wear and deformation of the inner wall of the ring groove 711 can be suppressed.
  • the alloy film 30A formed by Alfin treatment reduces the surface tension of the molten magnesium alloy in contact with the wear resistant ring member 3A, and the adhesion between the molten metal and the wear resistant ring member 3A (member 300). Will improve.
  • the film 30A (intermediate layer 30) is made of pure aluminum and does not contain silicon Si.
  • the embrittlement (decrease in material strength) of the structure of the piston main body 2 that can occur when Si is mixed with magnesium in the piston main body 2 can be suppressed.
  • the addition of Na to the film 30A reduces the surface tension of the film 30A in contact with the molten magnesium alloy, and improves the adhesion between the molten metal and the wear resistant ring member 3A (member 300).
  • Other functions and effects are the same as those of the first embodiment.
  • the engine format is arbitrary.
  • the engine is not limited to a 4-stroke engine and may be a 2-stroke engine. It is not limited to a spark ignition engine (gasoline engine), but may be a compression ignition engine (diesel engine).
  • the fuel supply method may be an in-cylinder direct injection type that directly injects into the cylinder (combustion chamber), or a port injection type that injects into the intake port.
  • An engine mounted on a ship or the like is not limited to a vehicle.
  • the intermediate layer of the present invention can be applied to any piston that has a high in-cylinder load during combustion and has a wear-resistant ring.
  • the shape of the piston (piston body) is arbitrary.
  • an annular passage for circulating a cooling medium may be provided inside the piston head and on the inner peripheral side of the wear-resistant ring.
  • a part of the wear-resistant ring may be used as the outer peripheral wall of the annular passage.
  • the intermediate layer of the present invention may be provided only on a part of the surface of the wear-resistant ring between the piston head and the wear-resistant ring.
  • a piston of an internal combustion engine includes an aluminum alloy or a magnesium alloy, a piston main body having a piston head and a skirt portion integral with the piston head, and the piston main body.
  • a wear-resistant ring having a higher hardness and having a piston ring groove, the wear-resistant ring being fixed to the piston head, and between the piston head and the wear-resistant ring, and wetting of aluminum and the aluminum
  • an intermediate layer containing an additive for improving the properties includes an aluminum alloy or a magnesium alloy, a piston main body having a piston head and a skirt portion integral with the piston head, and the piston main body.
  • the additive contains at least one of sodium, bismuth, barium, lithium, lead, thallium, strontium, and antimony.
  • the additive comprises sodium.
  • the mass ratio of the additive sodium in the intermediate layer is 9 ppm or more.
  • the mass ratio of sodium as the additive in the intermediate layer is 1% or less.
  • the intermediate layer has a thickness of 1 mm or less.
  • the piston main body portion includes an aluminum alloy.
  • the intermediate layer includes silicon.
  • the piston main body portion includes a magnesium alloy.
  • the intermediate layer does not contain silicon.
  • a wear-resistant ring cast into the body, and forming a base material for the wear-resistant ring with a material having a hardness higher than that of the piston main body, and an additive for improving aluminum and the wettability of the aluminum The step of covering the surface of the base material of the wear-resistant ring with the mixed material in a molten state, and the base material of the wear-resistant ring whose surface is covered with the mixed material are arranged in the casting mold of the piston main body portion A step of pouring a molten aluminum alloy or magnesium alloy into the casting mold in which the base material of the wear-resistant ring is disposed; And forming a grayed groove.
  • the additive contains at least one of sodium, bismuth, barium, lithium, lead, thallium, strontium, and antimony. (13) In another preferred embodiment, in any of the above embodiments, the additive comprises sodium. (14) In still another preferred embodiment, in any one of the above embodiments, the mass ratio of sodium as the additive in the mixed material is 9 ppm or more. (15) In still another preferred embodiment, in any one of the above embodiments, a mass ratio of the additive sodium in the mixed material is 1% or less. (16) In still another preferred embodiment, in any one of the above embodiments, the thickness of the layer formed of the mixed material between the piston head and the wear-resistant ring is 1 mm or less.
  • the piston main body is formed of the aluminum alloy.
  • the mixed material includes silicon.
  • the piston main body is formed of the magnesium alloy.
  • the mixed material does not contain silicon.
  • this invention is not limited to above-described embodiment, Various modifications are included.
  • the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.
  • a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment.

Landscapes

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

Abstract

Selon la présente invention, un piston d'un moteur à combustion interne comprend une partie corps principal de piston, une bague résistant à l'abrasion et une couche intermédiaire. La partie corps principal de piston est formée à partir d'un alliage d'aluminium ou d'un alliage de magnésium, et comprend une tête de piston et une partie collerette d'un seul tenant avec la tête de piston. La bague résistant à l'abrasion a une dureté plus élevée que celle de la partie corps principal de piston, comporte une rainure de bague de piston et est fixée à la tête de piston. La couche intermédiaire est disposée entre la tête de piston et la bague résistant à l'abrasion, et comprend de l'aluminium et un additif. L'additif améliore la mouillabilité de l'aluminium.
PCT/JP2018/014067 2017-04-12 2018-04-02 Piston de moteur à combustion interne et procédé de fabrication de piston de moteur à combustion interne WO2018190167A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201880019413.0A CN110446845A (zh) 2017-04-12 2018-04-02 内燃机的活塞以及内燃机的活塞的制造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017079015A JP2018178848A (ja) 2017-04-12 2017-04-12 内燃機関のピストン及び内燃機関のピストンの製造方法
JP2017-079015 2017-04-12

Publications (1)

Publication Number Publication Date
WO2018190167A1 true WO2018190167A1 (fr) 2018-10-18

Family

ID=63792529

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/014067 WO2018190167A1 (fr) 2017-04-12 2018-04-02 Piston de moteur à combustion interne et procédé de fabrication de piston de moteur à combustion interne

Country Status (3)

Country Link
JP (1) JP2018178848A (fr)
CN (1) CN110446845A (fr)
WO (1) WO2018190167A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112160845B (zh) * 2020-09-30 2023-03-10 上海齐耀动力技术有限公司 斯特林发动机及单向节流式活塞动密封机构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06142889A (ja) * 1992-11-12 1994-05-24 Unisia Jecs Corp 複合アルミニウム部材の製造方法
JP2009299621A (ja) * 2008-06-16 2009-12-24 Toyota Motor Corp 耐摩環付きピストンおよびその製造方法
JP2010523869A (ja) * 2007-04-05 2010-07-15 マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング 内燃機関用のピストン

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4229071A1 (de) * 1992-09-01 1994-03-03 Kolbenschmidt Ag Leichtmetallkolben für Brennkraftmaschinen
JP3314141B2 (ja) * 1996-03-26 2002-08-12 マツダ株式会社 複合化用予備成形体並びにこれが複合化された複合アルミニウム系金属部品及びこれらの製造方法
CN1517539B (zh) * 2003-01-16 2011-03-30 王江 一种具有耐磨环槽表面的活塞
JP2011236772A (ja) * 2010-05-07 2011-11-24 Isuzu Motors Ltd 粒子分散アルミ合金複合材料を用いた耐摩環及びそのアルミ合金ピストン、並びにその製造方法
JP5337142B2 (ja) * 2010-12-28 2013-11-06 日立オートモティブシステムズ株式会社 内燃機関のピストンと該ピストンの製造法及び摺動部材

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06142889A (ja) * 1992-11-12 1994-05-24 Unisia Jecs Corp 複合アルミニウム部材の製造方法
JP2010523869A (ja) * 2007-04-05 2010-07-15 マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツング 内燃機関用のピストン
JP2009299621A (ja) * 2008-06-16 2009-12-24 Toyota Motor Corp 耐摩環付きピストンおよびその製造方法

Also Published As

Publication number Publication date
JP2018178848A (ja) 2018-11-15
CN110446845A (zh) 2019-11-12

Similar Documents

Publication Publication Date Title
US4548126A (en) Piston with local inorganic fiber reinforcement and method of making the same
US7726273B2 (en) High strength steel cylinder liner for diesel engine
WO2018190167A1 (fr) Piston de moteur à combustion interne et procédé de fabrication de piston de moteur à combustion interne
JP5003652B2 (ja) シリンダブロック
JPH05240347A (ja) エンジン用ピストン耐摩環
JP4466541B2 (ja) シリンダブロック、及びシリンダブロック組立体
JPH1082345A (ja) 内燃機関用ピストンおよびその製造方法
US10578049B2 (en) Thermal barrier coating for engine combustion component
JP6246187B2 (ja) ピストンとクランクケースとから成る内燃機関用のアッセンブリ
WO2018029903A1 (fr) Piston de moteur à combustion interne et procédé de fabrication de piston de moteur à combustion interne
JPH0476252A (ja) 内燃機関用連結型シリンダーライナー
Reddy et al. Experimental analysis of coated engine cylinder liners
JPH0223806Y2 (fr)
CN114525504B (zh) 汽车气缸盖阀座
JP2023039250A (ja) ピストン、内燃機関、及びピストンの製造方法
WO2020059371A1 (fr) Procédé de fabrication d'un piston pour moteur à combustion interne
WO2018131356A1 (fr) Piston pour moteur à combustion interne
MAHLE GmbH Piston function, requirements, and types
JPS61126356A (ja) 軽金属製内燃機関用シリンダブロツク
JPH1144251A (ja) ２サイクルエンジンのピストン
JPS5985358A (ja) シリンダの製造方法
JP3656970B2 (ja) 内燃機関用ピストンおよびその製造方法
JPS60240854A (ja) 軽金属製内燃機関用ピストン
JP2022063961A (ja) シリンダブロックの製造方法
JPS608134Y2 (ja) 内燃機関用ピストン

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18784215

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18784215

Country of ref document: EP

Kind code of ref document: A1