WO2020059371A1 - Procédé de fabrication d'un piston pour moteur à combustion interne - Google Patents

Procédé de fabrication d'un piston pour moteur à combustion interne Download PDF

Info

Publication number
WO2020059371A1
WO2020059371A1 PCT/JP2019/031906 JP2019031906W WO2020059371A1 WO 2020059371 A1 WO2020059371 A1 WO 2020059371A1 JP 2019031906 W JP2019031906 W JP 2019031906W WO 2020059371 A1 WO2020059371 A1 WO 2020059371A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
axis
cooling channel
core
manufacturing
Prior art date
Application number
PCT/JP2019/031906
Other languages
English (en)
Japanese (ja)
Inventor
隆 井出
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
Publication of WO2020059371A1 publication Critical patent/WO2020059371A1/fr

Links

Images

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 
    • 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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid

Definitions

  • the present invention relates to a method for manufacturing a piston of an internal combustion engine.
  • Patent Document 1 a piston having a cooling channel for cooling in a piston head is known. Further, a piston having a lubricating liquid return hole communicating a ring groove and the inside of the piston in a piston head portion is known (Patent Document 2).
  • An object of the present invention is to provide a method of manufacturing a piston of an internal combustion engine that can suppress interference between a cooling channel and a lubricant return hole.
  • a method for manufacturing a piston of an internal combustion engine according to one embodiment of the present invention includes a core disposing step, a pouring step, a releasing step, and a lubricating liquid return hole forming step.
  • the core disposing step the core having the first core-concave portion is placed at a predetermined position with respect to the casting mold for forming the main body of the casting mold.
  • a drill is formed at a position overlapping with the first cooling channel-projection in the circumferential direction of the first axis and offset from the first cooling channel-projection in the direction of the first axis.
  • a lubrication liquid return hole is formed by processing.
  • FIG. 2 is a perspective view of a piston 1 of the engine according to the first embodiment.
  • FIG. 2 is a plan view of the piston 1 according to the first embodiment.
  • FIG. 2 is a bottom view of the piston 1 according to the first embodiment.
  • FIG. 3 is a sectional view taken along line S4-S4 of FIG. 2 in the first embodiment.
  • FIG. 5 is a cross-sectional view taken along line S5-S5 of FIG. 4 in the first embodiment.
  • FIG. 6 is an end view taken along line S6-S6 of FIG. 5 in the first embodiment.
  • FIG. 6 is an end view taken along line S7-S7 of FIG. 5 in the first embodiment.
  • FIG. 2 is a cross-sectional view of the first protrusion 10 according to the first embodiment as viewed from a radial outside of a first axis L1.
  • FIG. 4 is a perspective view of a core 17 after a concave portion forming step in the first embodiment.
  • FIG. 2 is a schematic view of a casting mold 14 according to the first embodiment.
  • FIG. 6 is an end view taken along line S6-S6 of FIG. 5 in a second embodiment.
  • FIG. 1 is a perspective view of a piston 1 of an engine (internal combustion engine) according to Embodiment 1
  • FIG. 2 is a plan view of the piston 1
  • FIG. 3 is a bottom view of the piston 1
  • FIG. 4 is a cross-sectional view taken along line S4-S4 of FIG. FIG.
  • the engine is, for example, a 4-stroke gasoline engine, and is applied to vehicles such as automobiles.
  • the piston 1 is connected to one end of a connecting rod via a piston pin. The other end of the connecting rod is connected to the crankshaft.
  • the piston 1 is made of an aluminum alloy (for example, Al-Si-based AC8A).
  • the piston 1 has a piston head portion 2, a first skirt portion 3, a second skirt portion 4, a first pin boss portion 5, a second pin boss portion 6, a first pin boss portion 5, and a second pin boss portion 6.
  • the first pin boss 5 has a first piston pin hole 5a
  • the second pin boss 6 has a second piston pin hole 6a.
  • the piston head 2 has a cylindrical portion 7 and a crown plate 8.
  • the cylindrical portion 7 has a cylindrical shape.
  • the cylindrical portion 7 has three ring grooves (a first ring groove 7a, a second ring groove 7b, and a third ring groove 7c) on the outer peripheral side.
  • a piston ring is mounted in each of the ring grooves 7a, 7b, 7c.
  • an axis passing through the center of the first ring groove 7a and perpendicular to the plane is defined as a first axis L1.
  • the crown plate-shaped portion 8 is provided on one side (combustion chamber side) of the tubular portion 7 in the direction of the first axis L1.
  • the crown plate-shaped portion 8 has four valve recesses (crown-recess) 8a on one of the first axes L1.
  • the valve recess 8a is a recess provided along the shape of the corresponding valve in order to avoid interference between the piston 1 and the intake or exhaust valve, that is, a relief groove for the valve.
  • the first skirt portion 3 and the second skirt portion 4 are provided on the other side of the cylindrical portion 7 in the direction of the first axis L1, and are separated from each other across the first axis L1 in the direction of the third axis L3. It is arranged.
  • Each of the first pin boss portion 5 and the second pin boss portion 6 is provided on the other of the crown plate-shaped portion 8 in the direction of the first axis L1, and the first axis L1 in the direction of the second axis L2. Are spaced apart from each other.
  • the inner peripheral surfaces 5b and 6b of the first pin boss portion 5 and the second pin boss portion 6 are used for positioning the piston 1 by abutting a jig (clamp) when drilling an oil return hole 12 described later. Function as a positioning part;
  • the first piston pin hole 5a and the second piston pin hole 6a are circular through holes whose centers are on the second axis L2.
  • the piston head 2 has a cooling channel 9 therein.
  • the cooling channel 9 is a substantially annular space whose center is on the first axis L1 and extends in the circumferential direction of the first axis L1.
  • the cooling channel 9 is located between the first ring groove 7a and the third ring groove 7c in the direction of the first axis L1.
  • the piston head 2 has an inlet (lubricating liquid introduction passage) 9a and an outlet 9b.
  • the inlet 9a and the outlet 9b are passages extending along the direction of the first axis L1, one end of which is connected to the cooling channel 9, and the other end of which is open to the other surface of the crown plate 8.
  • the inlet 9a and the outlet 9b are arranged at symmetrical points (points on the first axis L1).
  • the inlet 9a faces the injection port of the oil jet nozzle in the direction of the first axis L1.
  • the oil jet is installed in the cylinder block. The oil jet injects oil supplied from the main gallery of the cylinder block toward one of the first axis L1.
  • FIG. 5 is a sectional view taken along line S5-S5 of FIG.
  • the piston head portion 2 has two first convex portions (first cooling channel-convex portion) 10 and two second convex portions (second cooling channel-convex portion) 11.
  • the first convex portion 10 and the second convex portion 11 have a convex shape protruding toward the cooling channel 9 (toward one of the first axis L1).
  • the cooling channel 9 has substantially the same cross-sectional area along the cross section passing through the first axis L1 in a region other than the portion where the first cooling channel convex portion 10 and the second convex portion 11 are formed.
  • the first protrusion 10 and the second protrusion 11 are provided at positions offset from each other in the circumferential direction of the first axis L1. Further, the inlet 9a and the outlet 9b are formed at positions offset from the first protrusion 10 and the second protrusion 11 in the circumferential direction of the first axis L1.
  • the offset amount ⁇ d1 between the first protrusion 10 and the entrance 9a in the circumferential direction of the first axis L1 is formed to be larger than the diameter of the first protrusion 10.
  • ⁇ d1 and ⁇ d2 may be the same.
  • the two first protrusions 10, 10 are provided at positions symmetrical with respect to each other on a plane perpendicular to the first axis L1, with the point P1 on the first axis L1 being the center of symmetry. That is, the two first convex portions 10, 10 are in a two-fold symmetric relationship.
  • the first convex portion 10 is a cross section passing through the first axis L1 and passing through a point bisecting the first convex portion 10 in the circumferential direction of the first axis L1, that is, a cross section of the piston 1 shown in FIG. In, the boundary between the cooling channel 9 and the cooling channel 9 is inclined with respect to the first axis L1.
  • the piston head 2 has an oil return hole (lubricating liquid return hole) 12 and an oil introduction hole (lubricating liquid introduction hole) 13.
  • the oil return hole 12 overlaps with the first convex portion 10 in the circumferential direction of the first axis L1, and is offset from the first convex portion 10 in the direction of the first axis L1 (the first convex portion). This is a through-hole formed on the other side than 10).
  • the oil return hole 12 has its longitudinal direction inclined in the same direction as the inclination direction of the first convex portion 10.
  • the oil introduction hole 13 overlaps with the second convex portion 11 in the circumferential direction of the first axis L1, and is offset from the second convex portion 11 in the direction of the first axis L1 (the second convex portion). It is a hole with a bottom formed on the other side of (11).
  • the oil return hole 12 and the oil introduction hole 13 overlap the first skirt portion 3 and the second skirt portion 4 in the circumferential direction of the first axis L1.
  • FIG. 8 is a cross-sectional view of the first protrusion 10 as viewed from the radial outside of the first axis L1. As shown in FIG.
  • the first convex portion 10 is orthogonal to the radial axis of the first axis L1, and overlaps the first convex portion 10 and the oil return hole 12 in the radial direction of the first axis L1.
  • the section has an arc shape with the first center point P2 as the center of the radius of curvature.
  • the oil return hole 12 has a circular shape centered on the first center point P2.
  • the manufacturing method includes a core forming step, a core disposing step, a pouring step, a release step, a heat treatment step, and a machining step.
  • the core forming step is a step of forming a core, and includes a core body portion forming step and a concave part (first core-recess) forming step.
  • the core body forming step includes forming a doughnut-shaped core body (first state of the core body) by molding a powder (eg, sodium chloride, sand, or the like) and extending in the circumferential direction of the first axis L1. ) Is formed.
  • the first recess (first core-recess) 17c, the second recess (second core-recess) 17d This is a step of forming a pair of engagement holes (core-positioning portions) 17b.
  • a drill is used when forming the first concave portion 17c, the second concave portion 17d, and the pair of engagement holes 17b. Etc. may be used.
  • FIG. 9 is a perspective view of the core 17 after the recess forming step.
  • the core body 17a has an annular shape extending in the circumferential direction of the first axis L1.
  • the pair of engagement holes 17b are engaged with a pair of support pins 16 to be described later, so that the core 17 with respect to the main body forming mold 15 in the direction of the first axis L1 and the circumferential direction of the first axis L1.
  • the first concave portion 17c and the second concave portion 17d are provided two by two at predetermined positions in the circumferential direction of the first axis L1 in the core main body portion 17a, and the concave portions opening toward the outside of the core main body portion 17a. It has a shape.
  • FIG. 10 is a schematic diagram of the casting mold 14.
  • the casting mold 14 has a casting mold 15 for forming a main body and a pair of support pins (casting mold-positioning portion) 16.
  • the casting die 15 for forming the main body portion has a cavity (internal space) capable of forming the piston head portion 2, the first skirt portion 3, the second skirt portion 4, the first pin boss portion 5, and the second pin boss portion 6 in the pouring step.
  • the molten metal poured from the gate 15b is guided to the cavity 15a through the runner 15c.
  • the pair of support pins 16 are provided inside the cavity 15a, and hold the core 17.
  • the core disposing step is a step of disposing the core 17 in the casting mold 14, and by engaging a pair of support pins 16 with a pair of engagement holes 17b formed in the core 17, At a predetermined position in the cavity 15a.
  • the pouring step is a step of pouring the molten metal from the gate 15b into the cavity 15a.
  • the release step is a step in which the casting die 14 is opened and the piston in the first state is taken out after the molten metal is solidified to form the piston in the first state.
  • the piston in the first state has a cooling channel 9, a first convex portion 10, a second convex portion 11, and a piston-positioning portion (the inner peripheral surfaces 5b, 6b of the first pin boss portion 5 and the second pin boss portion 6). .
  • the cooling channel 9 is an annular space formed by the core body 17a.
  • the first convex portion 10 and the second convex portion 11 have a convex shape formed by the first concave portion 17c and the second concave portion 17d.
  • the heat treatment step is a step of performing a heat treatment on the piston in the first state after the mold release, and improves the properties of the cast first state piston to adjust it to appropriate strength and hardness.
  • the piston in the first state after the heat treatment step is machined, and the crown plate-shaped portion 8, the valve recess 8a, the first piston pin hole 5a, the second piston pin hole 6a, each ring groove 7a, 7b, This is a step of forming the outer shape of the piston 1 such as 7c.
  • the inner wall of the hole formed by removing the pair of support pins 16 is processed to form the inlet 9a and the outlet 9b of the cooling channel 9.
  • the machining step includes an oil return hole forming step.
  • the oil return hole forming step is a step of forming an oil return hole 12 and an oil introduction hole 13 in the cylindrical portion 7 by drilling.
  • the method of manufacturing the piston 1 according to the first embodiment includes a core disposing step, a pouring step, a mold releasing step, and an oil return hole forming step.
  • the core disposing step the core 17 having the first concave portion 17c is placed at a predetermined position with respect to the casting mold 15 for forming the main body of the casting mold 14.
  • the first convex part 10 formed by the first concave part 17c protrudes toward the cooling channel 9.
  • oil is returned by drilling to a position that overlaps with the first protrusion 10 in the circumferential direction of the first axis L1 and is offset from the first protrusion 10 in the direction of the first axis L1.
  • a hole 12 is formed.
  • the cooling channel 9 has a shape that escapes the oil return hole 12
  • the cooling channel 9 and the oil return hole 12 are moved in the direction of the first axis L1 while preventing interference between the cooling channel 9 and the oil return hole 12.
  • the axial dimension of the piston 1 can be shortened, so that fuel efficiency can be improved by weight reduction.
  • a sufficient surface area of the cooling channel 9 can be secured.
  • the penetrating position of the oil return hole 12 inside the piston can be laid out at a portion with relatively low stress, and a decrease in strength and productivity can be suppressed.
  • the method for manufacturing the piston 1 according to the first embodiment includes a core forming step.
  • a concave portion forming step of forming the first concave portion 17c is provided.
  • the first recess is formed by molding, a difference in the powder compression ratio between the core body and the first recess occurs due to a difference in thickness between the core body and the first recess. Occurs. This difference in compression ratio causes the core to crack.
  • the oil return hole 12 has its longitudinal direction inclined in the same direction as the inclination direction of the first convex portion 10. Thereby, a change in the thickness between the two can be suppressed. As a result, the distance between the two can be further reduced, and the size of the piston 1 can be reduced.
  • the inner peripheral surfaces 5b and 6b of the first pin boss portion 5 and the second pin boss portion 6 function as a piston-positioning portion for positioning the piston 1 by abutting a jig when drilling the oil return hole 12. I do. This eliminates the need to separately provide a portion for positioning the piston 1 on the piston 1, thereby reducing manufacturing costs.
  • the first convex portion 10 has a first center point.
  • the oil return hole 12 has an arc shape with P2 as the center of the radius of curvature, and the oil return hole 12 has a circular shape with the first center point P2 as the center. That is, by making the center of the radius of curvature of the arc shape of the first convex portion 10 coincide with the center of the circular shape of the oil return hole 12, a change in the thickness between the two can be suppressed.
  • the cooling channel 9 has substantially the same cross-sectional area in a cross section passing through the first axis L1 in a region other than the portion where the first convex portion 10 is formed. Thereby, in a portion other than the first convex portion 10, a sufficient oil flow path cross-sectional area can be secured, so that the cooling performance of the piston 1 can be improved.
  • the piston 1 has a second convex portion 11, and the second convex portion 11 has a point P1 on the plane of the first axis L1 as a center of symmetry on a plane perpendicular to the first axis L1, and a first convex portion. It is provided at a position symmetrical to 10, and has a convex shape protruding toward the cooling channel 9.
  • Piston 1 has second convex portion 11 and oil introduction hole 13.
  • the second convex portion 11 is provided at a position offset from the first convex portion 10 in the circumferential direction of the first axis L1, and has a convex shape protruding toward the cooling channel 9.
  • the oil introduction hole 13 is a bottomed hole formed at a position overlapping with the second protrusion 11 in the circumferential direction of the first axis L1 and offset from the second protrusion 11 in the direction of the first axis L1. It is.
  • the inlet 9a and outlet 9b of the cooling channel 9 and the oil return hole 12 are offset in the circumferential direction of the first axis L1.
  • the inlet portion 9a and the outlet portion 9b and the oil return hole 12 overlap in the circumferential direction of the first axis L1, the inlet portion 9a or the outlet portion 9b and the oil return hole 12 intersect, The oil injected from the oil jet nozzle may flow backward through the oil return hole 12 to the outer peripheral surface side of the piston 1. Therefore, the above problem can be prevented by offsetting both in the circumferential direction of the first axis L1.
  • the offset amount ⁇ d1 between the first protrusion 10 and the entrance 9a in the circumferential direction of the first axis L1 is formed to be larger than the diameter of the first protrusion 10.
  • the offset amount ⁇ d2 between the first protrusion 10 and the outlet 9b in the circumferential direction of the first axis L1 is formed to be larger than the diameter of the first protrusion 10. That is, by sufficiently maintaining the distance between the oil return hole 12 and the inlet portion 9a that overlap the first convex portion 10 in the circumferential direction and the distance between the oil return hole 12 and the outlet portion 9b. The thickness between the two can be ensured, and the strength of the piston 1 can be maintained.
  • the oil return hole 12 overlaps the first skirt 3 and the second skirt 4 in the circumferential direction of the first axis L1. That is, since the first skirt portion 3 and the second skirt portion 4 are thicker in the radial direction than the first pin boss portion 5 and the second pin boss portion 6, the piston in the case where the oil return hole 12 is provided is provided. (1) The influence on the overall strength can be suppressed.
  • FIG. 11 is an end view taken along line S6-S6 of FIG. 5 in the second embodiment.
  • the valve recess 8a overlaps with the second convex portion 11 in the circumferential direction of the first axis L1, and is offset from the second convex portion 11 in the direction of the first axis L1 (the second convex portion).
  • the second embodiment is different from the first embodiment in that it is formed on one side (11 side of FIG. 11).
  • the core body is not limited to an annular shape, and may have at least an arc-shaped portion.
  • the cooling channel may be a C-shaped space. In the case where the cooling channel-convex portion is provided in addition to the first cooling channel-convex portion, as long as the cross-sectional area of the cooling channel-excluding the region of the plurality of cooling channel-convex portions is substantially the same. Good.
  • the piston is provided on a piston head, a first skirt, a second skirt, a first pin boss, a second pin boss, and the first pin boss.
  • a first ring groove is provided on the outer peripheral side and has a cylindrical shape, and an axis passing through the center of the first ring groove and perpendicular to the plane is defined as a first line on a plane passing through the entire circumference of the first ring groove.
  • An axis parallel to the longitudinal direction of the piston pin inserted into the first piston pin hole and the second piston pin hole and orthogonal to the first axis is a second axis, and the first axis and the second axis are Axis perpendicular to both axes Is the third axis, the crown plate-shaped portion is provided on one of the cylindrical portions in the direction of the first axis, and each of the first skirt portion and the second skirt portion is The first pin boss portion and the second pin boss portion are provided on the other of the cylindrical portions in the direction of the first axis, and are spaced apart from each other across the first axis in the direction of the third axis.
  • each of the pin boss portions is provided on the other of the crown plate-shaped portions in the direction of the first axis, and is spaced apart from each other across the first axis in the direction of the second axis.
  • the casting die in a core disposing step of disposing a core in a casting die, includes a casting die for forming a main body portion, and a casting die-positioning portion.
  • the core can hold a core, the core includes a core body, a core-positioning part, and a first core-recess, and the core body is arranged in a circumferential direction about the first axis.
  • the core-positioning portion abuts the casting mold-positioning portion so that the core-positioning portion is formed in the direction of the first axis and in the circumferential direction with respect to the first axis.
  • the core can be installed at a predetermined position with respect to a casting mold, and the first core-recess is provided at a predetermined position in a circumferential direction with respect to the first axis of the core body, Concave opening toward the outside of the core body Having a shape, the core disposing step, a pouring step, which is performed after the core disposing step, injects the molten metal into the casting mold, the pouring step, and a demolding step. Then, after the molten metal is solidified to form a piston in a first state, the casting mold is released from the piston in the first state.
  • the piston-positioning portion is capable of specifying a position for forming the lubricating liquid return hole by abutting on a jig during the drilling, and
  • the lubricating fluid return hole overlaps with the first cooling channel-projection in a circumferential direction about the first axis, and the first cooling channel-projection in the direction of the first axis.
  • the method includes a core forming step, wherein the core forming step includes a core body portion forming step in a first state and a first core-recess forming step.
  • the first core-recess is formed by cutting the core main body with the drill in the first state.
  • the first cooling channel-projection is defined by the first cooling channel-projection passing through the first axis and in a circumferential direction about the first axis.
  • the piston-positioning portion may be a surface of the first pin boss portion facing the second pin boss portion in the direction of the second axis, or the second pin boss portion.
  • the pin boss is provided on a surface facing the first pin boss.
  • the first cooling channel tunnel-projection and the lubricating fluid are orthogonal to a radial axis with respect to the first axis and radially with respect to the first axis.
  • the first cooling channel-convex portion has an arc shape having a first center point as a center of a radius of curvature
  • the lubricating liquid return hole has the first cooling channel-convex portion. It has a circular shape centered on the center point.
  • the cooling channel has a cross-sectional area of a cross section passing through the first axis in a region other than a portion where the first cooling channel-convex portion is formed. It is almost the same.
  • the piston has a second cooling channel-projection, wherein the second cooling channel-projection is a plane perpendicular to the first axis. , A point on the line of the first axis is a center of symmetry, the first cooling channel is provided at a position symmetrical with respect to the convex portion, and has a convex shape protruding toward the cooling channel.
  • the piston has a second cooling channel-projection and a lubricating liquid introduction hole
  • the second cooling channel-projection includes the first cooling channel-projection.
  • the first cooling channel is provided at a position offset from the convex portion, has a convex shape protruding toward the cooling channel
  • the lubricating liquid introduction hole is provided in the circumferential direction about the first axis.
  • a bottomed hole that overlaps with the second cooling channel-projection in the direction and is formed at a position offset from the second cooling channel-projection in the direction of the first axis.
  • the piston has a second cooling channel-projection and a crown-recess
  • the second cooling channel-projection comprises the first cooling channel-projection.
  • the first cooling channel is provided at a position offset from the convex portion, and has a convex shape protruding toward the cooling channel, and the crown-recess is formed on the crown plate-shaped portion.
  • the piston includes a lubricating liquid introducing passage provided in the piston head portion, and the lubricating liquid introducing passage extends along a direction of the first axis.
  • a passage having one end connected to the cooling channel and the other end being a surface of the piston head portion facing the combustion chamber of the internal combustion engine in the crown plate-shaped portion in the direction of the first axis;
  • the lubricating liquid introduction passage is open toward the opposite side of the crown surface, and is formed at a position offset from the first cooling channel-convex portion in a circumferential direction about the first axis.
  • an offset amount between the first cooling channel-convex portion and the lubricating liquid introduction passage in a circumferential direction with respect to the first axis is equal to the first cooling channel-convex portion. Larger than the diameter of.
  • the lubricating liquid return hole overlaps the first skirt portion in a circumferential direction about the first axis.
  • the present invention is not limited to the above-described embodiment, and includes various modifications.
  • the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described above.
  • a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of one embodiment can be added to the configuration of another embodiment.

Landscapes

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

Abstract

La présente invention concerne un procédé de fabrication d'un piston, comprenant une étape de disposition de noyau, une étape de coulée de métal fondu, une étape de démoulage, et une étape de formation de trou de retour de liquide lubrifiant. L'étape de disposition de noyau consiste à installer un noyau, qui présente une première partie évidée, dans une position prédéterminée par rapport à un moule de coulée de formation de partie de corps d'un moule de coulée. L'étape de formation de trou de retour de liquide lubrifiant consiste à former un trou de retour d'huile par perçage dans une position qui recouvre une première partie saillante dans la direction circonférentielle d'une première ligne d'axe, et est décalée par rapport à la première partie saillante dans la direction de la première ligne d'axe.
PCT/JP2019/031906 2018-09-21 2019-08-14 Procédé de fabrication d'un piston pour moteur à combustion interne WO2020059371A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-176822 2018-09-21
JP2018176822A JP7011561B2 (ja) 2018-09-21 2018-09-21 内燃機関のピストンの製造方法

Publications (1)

Publication Number Publication Date
WO2020059371A1 true WO2020059371A1 (fr) 2020-03-26

Family

ID=69886968

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/031906 WO2020059371A1 (fr) 2018-09-21 2019-08-14 Procédé de fabrication d'un piston pour moteur à combustion interne

Country Status (2)

Country Link
JP (1) JP7011561B2 (fr)
WO (1) WO2020059371A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09195847A (ja) * 1996-01-11 1997-07-29 Nissan Motor Co Ltd 内燃機関のピストン支持構造
JP2010144580A (ja) * 2008-12-17 2010-07-01 Toyota Motor Corp ピストン冷却流路形成用環状体、ピストン用クーリングチャンネル形成方法、及び内燃機関用ピストン
US20120160092A1 (en) * 2010-12-22 2012-06-28 GM Global Technology Operations LLC Method of making a piston oil gallery using a hollow metallic core
DE102011106655A1 (de) * 2011-07-05 2013-01-10 Mahle International Gmbh Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor
WO2017150321A1 (fr) * 2016-03-02 2017-09-08 本田技研工業株式会社 Piston de moteur à combustion interne et son procédé de fabrication
JP2018131925A (ja) * 2017-02-14 2018-08-23 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及びその製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09195847A (ja) * 1996-01-11 1997-07-29 Nissan Motor Co Ltd 内燃機関のピストン支持構造
JP2010144580A (ja) * 2008-12-17 2010-07-01 Toyota Motor Corp ピストン冷却流路形成用環状体、ピストン用クーリングチャンネル形成方法、及び内燃機関用ピストン
US20120160092A1 (en) * 2010-12-22 2012-06-28 GM Global Technology Operations LLC Method of making a piston oil gallery using a hollow metallic core
DE102011106655A1 (de) * 2011-07-05 2013-01-10 Mahle International Gmbh Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor
WO2017150321A1 (fr) * 2016-03-02 2017-09-08 本田技研工業株式会社 Piston de moteur à combustion interne et son procédé de fabrication
JP2018131925A (ja) * 2017-02-14 2018-08-23 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及びその製造方法

Also Published As

Publication number Publication date
JP2020045879A (ja) 2020-03-26
JP7011561B2 (ja) 2022-01-26

Similar Documents

Publication Publication Date Title
CN106837586B (zh) 润滑回路及形成方法
EP0744541B1 (fr) Procédé pour la production de blocs-moteurs
CN108568509B (zh) 内燃发动机及形成方法
JP2007270813A (ja) 内燃機関用ピストン
JP4329810B2 (ja) シリンダブロック
JP2006207459A (ja) 内燃機関の冷却構造及び水路形成部材
JP4187045B2 (ja) シリンダブロック
US20110120299A1 (en) Cast piston with pin bore lubrication and method of manufacturing same
WO2013144824A2 (fr) Moteur monobloc
US7387102B2 (en) Cast part for an internal combustion engine
US10174649B2 (en) Cylinder block with integrated oil jacket
WO2020059371A1 (fr) Procédé de fabrication d'un piston pour moteur à combustion interne
JP5227374B2 (ja) スペーサ
US9370847B2 (en) Method for manufacturing piston of automobile engine
JP4329809B2 (ja) シリンダブロック
US10711732B2 (en) Reduced height piston
US10781769B2 (en) Method of manufacturing an engine block
JP6225971B2 (ja) 多気筒エンジンのシリンダ本体構造
JP2018131925A (ja) 内燃機関のピストン及びその製造方法
US6925981B2 (en) Process for producing a cylinder block with a sleeve
JP6117575B2 (ja) 鋳造用金型装置
WO2018190167A1 (fr) Piston de moteur à combustion interne et procédé de fabrication de piston de moteur à combustion interne
US20180274477A1 (en) Cylinder head for internal combustion engine
US10995694B2 (en) Cylinder block
US9650987B2 (en) Water-cooled internal combustion engine cylinder head and water-cooled internal combustion engine equipped with same

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: 19862352

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: 19862352

Country of ref document: EP

Kind code of ref document: A1