WO2019167260A1 - Soupape pour moteurs à combustion interne - Google Patents

Soupape pour moteurs à combustion interne Download PDF

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Publication number
WO2019167260A1
WO2019167260A1 PCT/JP2018/008049 JP2018008049W WO2019167260A1 WO 2019167260 A1 WO2019167260 A1 WO 2019167260A1 JP 2018008049 W JP2018008049 W JP 2018008049W WO 2019167260 A1 WO2019167260 A1 WO 2019167260A1
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WO
WIPO (PCT)
Prior art keywords
heat insulating
insulating layer
valve
recess
internal combustion
Prior art date
Application number
PCT/JP2018/008049
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English (en)
Japanese (ja)
Inventor
良一 吉野
浩史 国武
佐藤　大樹
Original Assignee
日鍛バルブ株式会社
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 日鍛バルブ株式会社 filed Critical 日鍛バルブ株式会社
Priority to JP2020503234A priority Critical patent/JP7064250B2/ja
Priority to CN201880090447.9A priority patent/CN111801488A/zh
Priority to KR1020207026449A priority patent/KR20200124248A/ko
Priority to PCT/JP2018/008049 priority patent/WO2019167260A1/fr
Publication of WO2019167260A1 publication Critical patent/WO2019167260A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
    • F01L3/04—Coated valve members or valve-seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group

Definitions

  • the present invention relates to a valve for an internal combustion engine used as an intake valve or an exhaust valve in an internal combustion engine (engine) such as an automobile.
  • an intake port and an exhaust port opening in a combustion chamber are provided with an internal combustion engine valve as an intake valve and an exhaust valve, respectively.
  • This valve for an internal combustion engine includes a shaft portion and a head portion (Head) that is integrated in an expanded state at one end of the shaft portion.
  • the diameter of the valve bottom is reduced as it approaches the shaft from the bottom of the valve.
  • a face surface (Seat) is provided on the side.
  • the internal combustion engine valve is disposed in the combustion chamber so that the back surface of the head portion faces the opening of the intake and exhaust ports, and the internal combustion engine valve is operated by a valve operating mechanism.
  • the heat-insulating layer peels off from the outer peripheral portion of the bottom surface of the valve, and the starting point serves as a starting point for radially inward from the outer peripheral portion. It has been found that peeling tends to proceed toward the direction (radial center). If such an internal combustion engine valve is used, the thermal efficiency of the internal combustion engine cannot be sufficiently increased.
  • the present invention has been made in view of the above circumstances, and an object thereof is to suppress the possibility that the outer peripheral portion of the heat insulating layer is peeled off from the valve bottom surface in a valve for an internal combustion engine in which the heat insulating layer is fixed to the valve bottom surface. There is to do.
  • a valve for an internal combustion engine in which a heat insulating layer is fixed to the bottom surface of the valve directed to the combustion chamber, A peripheral wall is provided integrally with the bottom surface of the valve so as to surround the heat insulating layer, The inner peripheral surface of the peripheral wall is configured to contact the entire peripheral surface of the heat insulating layer over the entire thickness range from the valve bottom surface to the surface of the heat insulating layer.
  • the peripheral wall covers the entire peripheral surface of the heat insulating layer over the entire thickness range from the valve bottom surface to the surface of the heat insulating layer, the valve bottom surface (mating surface) and the heat insulating layer ( The boundary (line) formed by the peripheral wall is not exposed to the outside by the peripheral wall, and the combustion gas (pressure, temperature, etc.) acts on the boundary between the bottom surface of the valve and the heat insulating layer, and the outer peripheral portion of the heat insulating layer is It is possible to suppress peeling (flipping) from the bottom surface of the bulb.
  • the heat insulating layer is arranged on the bottom surface of the valve with a reduced diameter state that is retracted radially inward from the outer peripheral edge of the bottom surface of the valve.
  • the same effect as the above (1) pressing the action of combustion gas from the outside with respect to the boundary (line) between the valve bottom surface and the heat insulating layer with the peripheral wall, and the inner periphery of the peripheral wall
  • the heat expansion of the heat insulation layer is of course achieved by suppressing the movement of the outer peripheral portion of the heat insulation layer from the valve bottom surface by frictional force based on the contact relationship between the surface and the entire peripheral surface of the heat insulation layer).
  • the amount of shrinkage in the radially inward direction of the heat insulating layer during heat shrinkage and the The difference between the amount of contraction in the radially inward direction or the difference between the amount of expansion in the radially outward direction of the heat insulating layer and the amount of expansion in the radially outward direction of the valve bottom surface during thermal expansion is fixed to the entire bottom surface of the valve.
  • the outer periphery of the heat insulation layer can be suppressed compared to In contrast, the direction of the force detached from the valve bottom can be prevented from being affected.
  • the thermal expansion coefficient of the heat insulation layer is smaller than the thermal expansion coefficient of the bottom surface of the valve
  • the inner peripheral surface of the peripheral wall is coupled to the entire peripheral surface of the heat insulating layer
  • one end surface of the peripheral wall is coupled to the valve bottom surface on the outer peripheral side of the heat insulating layer.
  • the peripheral wall presses (tightens) the entire peripheral surface of the heat insulating layer inward in the radial direction. For this reason, at the time of thermal expansion and thermal contraction, the peripheral wall acts on the heat insulation layer in a direction to reduce the expansion amount difference and the shrinkage amount difference between the heat insulation layer and the valve bottom surface. The possibility that the layer peels can be further suppressed.
  • the outer edge of the heat insulating layer is set to be closer to the outer edge of the valve bottom surface than the radial center of the valve bottom surface. According to this structure, even if it takes the structure which suppresses peeling based on the thermal expansion and thermal contraction which act on the outer peripheral part of a heat insulation layer, a heat insulation function can be fundamentally ensured with a heat insulation layer.
  • the peripheral wall is formed of a covering material that covers not only the entire peripheral surface of the heat insulating layer but also the entire surface of the heat insulating layer. According to this configuration, since the covering material covers the surface of the heat insulating layer while being bonded to the bottom surface of the valve, the surface side of the heat insulating layer is pressed toward the bottom surface of the valve. The movement in which the outer peripheral portion of the heat insulating layer tends to be peeled off from the bottom surface of the valve can be effectively suppressed as compared with the case where the peripheral surface only covers the peripheral surface.
  • the covering material is set so as to cover all of the outer peripheral side of the heat insulating layer in the valve bottom surface,
  • the covering material contains a heat insulating component. According to this configuration, even if the diameter of the heat insulating layer is made shorter than the diameter of the bottom surface of the valve in order to suppress the peeling of the heat insulating layer due to thermal expansion and contraction, the covering material is the heat insulating layer of the valve bottom surface. As compared with the case where the entire outer peripheral side of the valve is not covered, the heat insulation at the bottom surface of the valve can be improved.
  • the covering material is provided with an extension portion that extends to a margin portion from the valve bottom surface to the valve face surface, An engagement portion is provided in the margin portion, The extension portion of the covering material is mechanically engaged with the engagement portion.
  • the mechanical engagement between the extending portion of the covering material and the margin portion can increase the bonding strength between the covering material and the bottom surface of the valve, and against the movement of the outer peripheral portion of the heat insulating layer such as peeling and warping.
  • the ability of the covering material to resist can be increased.
  • a coating material is bonded to the surface of the heat insulating layer and the bottom surface of the valve in the recess so as to cover the entire surface of the heat insulating layer and the bottom surface of the valve.
  • the heat insulating layer is not only related to the inner wall of the recess, but also the covering material bonded to the surface of the heat insulating layer and the bottom surface of the valve is free from the movement of the outer peripheral portion of the heat insulating layer such as peeling and warping. Therefore, it is possible to further suppress the possibility that the outer peripheral portion of the heat insulating layer is peeled off from the bottom surface of the valve.
  • the actual length of contact between the bottom surface of the valve and the covering material is limited by the presence of the recess, thereby reducing the influence of thermal expansion and contraction.
  • the bonding strength of the covering material to the bottom surface of the valve can be sufficiently ensured.
  • the said heat insulation layer is set as the structure formed by integrating each some structure layer with a laminated state.
  • the heat-insulating layer has a laminated structure composed of a plurality of constituent layers, and even if there is a boundary between adjacent constituent layers, the same effect as the above (1) can be obtained. it can.
  • the thermal expansion coefficient of the heat insulation layer is different from the thermal expansion coefficient of the valve bottom surface, It is set as the structure by which the thickness of the outer peripheral part in the said heat insulation layer is made thin compared with the thickness of the radial direction inner side part rather than the outer peripheral part of this heat insulation layer. According to this structure, it can suppress that a bending stress acts on the outer peripheral part in a heat insulation layer at the time of a thermal expansion or a thermal contraction, and a crack generate
  • the heat insulation layer and the valve bottom surface are integrally bent during thermal expansion and heat shrinkage, and bending stress acts on them.
  • the maximum bending stress with respect to the heat insulating layer is generated as edge stress on the outer surface in the thickness direction of the heat insulating layer, and the value of the maximum bending stress increases as the distance from the neutral surface to the outer surface in the thickness direction increases. For this reason, the longer the distance from the neutral surface to the outer surface in the thickness direction, the higher the possibility that cracks will occur in the outer peripheral portion of the heat insulation layer. The thicker the thickness, the deeper.
  • the outer peripheral portion of the heat insulating layer is more inward than the outer peripheral portion in terms of the radius of curvature of the heat insulating layer.
  • the bending stress is further increased when the radius of curvature is small, and the possibility of occurrence of cracks is further increased.
  • this claim 13 by making the thickness of the outer peripheral portion of the heat insulating layer thinner than the thickness of the radially inner side portion of the outer peripheral portion, the thickness from the neutral surface of the heat insulating layer is increased. The maximum bending stress during thermal expansion and contraction is reduced by reducing the distance to the outer surface in the direction.
  • the thickness of the outer peripheral portion of the heat insulating layer is made thinner than the thickness of the radially inner side portion of the heat insulating layer, and the thickness becomes thinner as it goes radially outward.
  • the thickness of the outer peripheral part in the layer is not made as thin as possible, and the heat insulation property deterioration of the heat insulating layer on the bottom surface of the valve can be suppressed as much as possible. For this reason, peeling of the heat insulation layer outer peripheral part based on a crack can be suppressed exactly, suppressing the heat insulation fall of the heat insulation layer in a valve
  • the surface of the heat insulating layer is configured to be flush with the portion of the valve bottom surface excluding the recess.
  • the outer peripheral portion of the heat insulating layer can be made thinner toward the radially outer side while the entire peripheral surface of the heat insulating layer is in contact with the inner peripheral wall of the recess. For this reason, peeling of the heat insulation layer with respect to the valve
  • the entire valve bottom surface can be flattened.
  • the basic structure and basic performance of a generalized flat valve can be secured.
  • the actual length of contact between the bottom surface of the valve and the covering material is limited by the presence of the recess, thereby reducing the influence of thermal expansion and contraction.
  • the bonding strength of the covering material to the bottom surface of the valve can be sufficiently ensured.
  • the surface of the heat insulation layer is configured to be formed as a raised state on the outer side of the recess opening.
  • the outer peripheral portion of the heat insulating layer can be made thinner toward the outer side in the radial direction while bringing the entire peripheral surface of the heat insulating layer into contact with the inner peripheral wall of the recess, and moreover, from the valve bottom surface. It is possible to increase the thickness of the radially inward side portion of the heat insulating layer while suppressing the rising amount of the heat insulating layer. For this reason, the heat insulation in a valve bottom face can be improved, aiming at the improvement of the peeling suppression effect of a heat insulation layer, and flattening of the whole valve bottom face.
  • the peripheral wall is formed of a covering material that covers not only the entire peripheral surface of the heat insulating layer but also the entire surface of the heat insulating layer. According to this configuration, since the covering material covers the surface of the heat insulating layer while being bonded to the bottom surface of the valve, the surface side of the heat insulating layer is pressed toward the bottom surface of the valve. The movement of the outer peripheral portion of the heat insulating layer to be peeled off from the bottom surface of the valve (including the occurrence of cracks in the outer peripheral portion of the heat insulating layer) can be effectively suppressed as compared to the case where the peripheral surface is simply covered with the covering material.
  • the thermal expansion coefficient of the heat insulation layer is configured to be smaller than the thermal expansion coefficient of the bottom surface of the valve. According to this configuration, even if the difference in thermal expansion coefficient is based on the fact that the thermal expansion coefficient of the heat insulating layer is smaller than the thermal expansion coefficient of the bottom surface of the valve, the same effect as in the thirteenth aspect is achieved. An effect can be obtained.
  • the possibility that the outer peripheral portion of the heat insulating layer peels from the bottom surface of the valve can be suppressed as much as possible.
  • Explanatory drawing which shows the intake valve or exhaust valve as a valve for internal combustion engines which concerns on 1st Embodiment used for an internal combustion engine.
  • Explanatory drawing which shows the longitudinal cross-section of FIG. 2 simply. The top view which looked at FIG. 3 from upper direction.
  • Explanatory drawing which shows simply the effect
  • the photograph figure which shows the peeling state of the outer peripheral part of the laminated body before and after the experiment in Experimental example 1 magnification: 5 times the whole figure, 50 times magnification of each part).
  • the photograph figure which shows the peeling state of the laminated body outer periphery part before and after the experiment in Experimental example 2 (magnification: 5 times the whole figure, each part expansion 50 times).
  • FIG. 24 is an enlarged explanatory diagram for explaining the generation of bending stress by enlarging the W portion in FIG. 23.
  • the longitudinal cross-sectional view which shows the head part of the valve
  • reference numeral 1 denotes an intake valve or an exhaust valve (hereinafter referred to as a valve) as a valve for an internal combustion engine assembled to the cylinder head 2.
  • the cylinder head 2 defines a combustion chamber S at a part of the wall surface.
  • the cylinder head 2 has a suction and exhaust port (hereinafter referred to as a port) P formed so as to open to the combustion chamber S, and a seat insert 9 is provided at the opening peripheral edge of the port P.
  • the valve 1 includes, as a valve main body 1A, a shaft portion (Stem) 3 and a head portion (Head) 4 that is integrated at one end of the shaft portion 3 in a diameter-expanded state.
  • the head portion 4 has a bulb bottom surface (Face) 5 with a front end surface of the head portion 4 having a widening, while being reduced in diameter as it approaches the shaft portion 3 from the valve bottom surface 5.
  • a face surface (Seat) 7 is formed on the head portion 4 via a margin portion (Margin) 6 on the back surface side of the valve bottom surface 5 in the outer peripheral portion.
  • the valve 1 is disposed in the combustion chamber S so that the back surface of the head portion 4 faces the opening of the port P.
  • valve 1 By operating the valve 1 with the valve operating mechanism 10, the face of the head portion 4 in the valve 1 is arranged.
  • the surface (Seat) 7 is separated from the seat insert 9 at the peripheral edge of the port P opening.
  • the valve 1 (head portion 4) opens and closes the port P while the valve bottom surface 5 of the valve main body 1A faces the combustion chamber S side.
  • valve body (SUH11) is used as the material of the valve body 1A.
  • the valve body (SUH11) has a thermal conductivity of about 20.5 W / m ⁇ K (at room temperature) and a thermal expansion coefficient of about 11.0 ⁇ 10 ⁇ 6 / ° C. (at room temperature). It has become.
  • a heat insulating layer 11 is fixed (bonded) to the valve 1 on the valve bottom surface 5 of the valve body 1A.
  • the heat insulating layer 11 has the same diameter as the first heat insulating layer 12 and the first heat insulating layer 12 in order toward the direction away from the valve bottom surface 5 (upward in FIG. 3).
  • a second heat insulating layer 13 is laminated, and the valve bottom surface 5 and the first heat insulating layer 12, and the first heat insulating layer 12 and the second heat insulating layer 13 are bonded (sintered) by firing.
  • a boundary B1 is formed between the valve bottom surface 5 and the first heat insulating layer 12, and a boundary B2 is formed between the first heat insulating layer 12 and the second heat insulating layer 13. . 2 and 3, the thickness of the heat insulating layer 11 (first and second heat insulating layers 12 and 13) is exaggerated because the actual illustration is not easy (the same applies to the drawings after FIG. 4). ).
  • hollow ceramic beads or hollow glass beads about 40 to 80 wt%, binder (for example, silicon-based binder or zirconia-based binder): 20 to About 60 wt% is contained, and in the second heat insulating layer 13, hollow ceramic beads or hollow glass beads: about 50 to 90 wt%, binder (for example, silicon binder or zirconia binder): 10 About 50 wt% is contained.
  • binder for example, silicon-based binder or zirconia-based binder
  • the first heat insulating layer 12 has a thermal conductivity of 0.4 to 1.2 W / m ⁇ K (at room temperature) under a layer thickness of about 20 to 100 ⁇ m on the valve bottom surface 5.
  • the second heat insulating layer 13 has a thermal conductivity of 0.2 to 1.0 W / m ⁇ K (on the first heat insulating layer 12 under a layer thickness of about 20 to 250 ⁇ m. Room temperature).
  • the thermal expansion coefficient of the heat insulation layer 11 is made smaller than the thermal expansion coefficient of the valve bottom surface 5, and the second heat insulation.
  • the heat insulating layer 11 (first and second heat insulating layers 12 and 13) has a diameter smaller than the outer edge of the valve bottom surface 5 as shown in FIGS. Specifically, the outer edge of the heat insulating layer 11 is set so as to be closer to the outer edge of the valve bottom surface 5 than the central portion O in the radial direction of the valve bottom surface 5.
  • the heat insulating layer 11 basically has a heat insulating function for the valve bottom surface 5, the thermal expansion difference and the heat contraction difference based on the difference in thermal expansion coefficient between the valve main body 1 ⁇ / b> A (the valve bottom surface 5) and the heat insulating layer 11 are This is because the length of the heat shrink target is reduced by shortening the length, and thereby the peeling of the heat insulating layer 11 from the valve bottom surface 5 is suppressed.
  • the heat insulating layer 11 is sintered (bonded) to the entire valve bottom surface 5 as an example. This will be specifically described with reference to FIGS.
  • the valve bottom surface 5 (valve body 1 ⁇ / b> A) and the heat insulating layer 11 are actually sintered and integrated, but the valve bottom surface 5 and the heat insulating layer 11 are independently thermally expanded and contracted. Assuming that the thermal expansion coefficient of the valve bottom surface 5 is larger than the thermal expansion coefficient of the heat insulating layer 11, the reference state shown in FIG.
  • the heat insulation layer 11 is more easily peeled from the valve bottom surface 5 as the expansion amount difference ⁇ Le at that time is larger.
  • the phenomenon during heat shrinkage changes from the reference state shown in FIG. 6A (the same state as the reference state shown in FIG. 5A) to FIG. 6C, and the valve bottom surface 5 is reduced in diameter.
  • the portion closer to the mating surface with the valve bottom surface 5 in the outer peripheral edge portion of the heat insulating layer 11 is pulled inward in the radial direction. From this, it is considered that the heat insulation layer 11 is more easily peeled from the valve bottom surface 5 as the shrinkage difference ⁇ Le at that time is larger.
  • the valve bottom surface 5 and the heat insulating layer 11 on the valve bottom surface 5 are covered with a covering material 15 as shown in FIGS.
  • the covering material 15 is formed in a substantially cylindrical shape with a bottom in a state in which the bottom side is arranged away from the valve bottom surface 5, and the covering material 15 includes a peripheral wall portion 16 as a peripheral wall and a peripheral wall portion 16. And a bottom wall portion 17 which is provided integrally and forms a bottom portion.
  • the covering material 15 (the peripheral wall portion 16 and the bottom wall portion 17) contains ceramics such as zirconia, alumina, silica, and silicate as main components, and hollow ceramic beads and hollow components that are components of the heat insulating layer 11 described above. These glass beads are not contained in the coating material 15.
  • the thermal conductivity as close as possible to the thermal conductivity of the heat insulating layer 11 is ensured by the main component even if not as much as the heat insulating layer 11 (the heat conductivity of the valve bottom surface 5 (valve body 1 ⁇ / b> A)).
  • Rate> thermal conductivity of the covering material 15> thermal conductivity of the heat insulating layer 11 thermal conductivity of the heat insulating layer 11
  • the thermal expansion coefficient of the covering material 15 is as close as possible to the thermal expansion coefficient of the valve bottom surface 5 ( The thermal expansion coefficient of the valve bottom surface 5> The thermal expansion coefficient of the covering material 15> The thermal expansion coefficient of the heat insulating layer 11).
  • one end surface (the lower end surface in FIG. 3) of the peripheral wall portion 16 is bonded (sintered) to the valve bottom surface 5 on the outer peripheral side of the heat insulating layer 11.
  • the inner peripheral surface 16 i of the peripheral wall portion 16 is in contact with the entire peripheral surface 11 p of the heat insulating layer 11 over the entire thickness range from the valve bottom surface 5 to the surface 13 s of the second heat insulating layer 13.
  • the boundary B1 between the valve bottom surface 5 and the first heat insulation layer 12 and the boundary B2 between the first heat insulation layer 12 and the second heat insulation layer 13 are as follows: , Is not supposed to be exposed to the outside.
  • the bottom wall 17 covers the surface 11s (13s) of the heat insulating layer 11 (second heat insulating layer 13) while being in contact with the surface 11s (13s) as shown in FIGS.
  • the bottom wall portion 17 is integrally provided on the other end surface of the peripheral wall portion 16 so as to close the other end opening.
  • the bottom wall portion 17 is connected to the valve bottom surface 5. Based on this, when a force in a direction away from the other end of the peripheral wall portion 16 (upward in FIG. 3) acts on the bottom wall portion 17 by the outer peripheral portion of the second heat insulating layer 13, the force is resisted. It is supposed to be.
  • the bottom wall portion 17 is also bonded (sintered) to the surface 13s of the second heat insulating layer 13, and the thickness of the bottom wall portion 17 is 1 ⁇ m to 30 ⁇ m.
  • valve 1 produces the following operation. (1) In the valve 1, it is possible to prevent the outer peripheral portion of the heat insulating layer 11 from being peeled off based on the action of the combustion gas while ensuring the heat insulating property at the valve bottom surface 5 as much as possible. Even if the head portion 4 of the valve 1 is used in a state where it is disposed in the combustion chamber S, one end surface of the peripheral wall portion 16 of the covering material 15 is coupled to the valve bottom surface 5 and the peripheral wall portion of the covering material 15 Since the inner peripheral surface 16i of 16 is connected to the entire peripheral surface 11p of the heat insulating layer 11 (first and second heat insulating layers 12, 13) over the entire thickness range, the combustion gas is shown in FIG.
  • the peripheral wall portion 16 and the bottom wall portion 17 enclose the entire heat insulating layer 11, and the peripheral surface 11 p of the heat insulating layer 11 and the peripheral wall portion 16 of the covering material 15. It is highly reliable that the combustion gas no longer acts on (enters) the boundary with the inner peripheral surface 16i of the gas (see FIG. 7) and the outer peripheral portion of the heat insulating layer 11 is peeled off based on the action of the combustion gas. Is suppressed.
  • the heat insulation layer 11 ensures basic heat insulation properties for the valve bottom surface 5, but the heat conductivity of the valve bottom surface 5 where the heat insulation layer 11 is not disposed is made as close as possible to the heat insulation layer 11.
  • the peripheral wall portion 16 of the covering material 15 having the covering covers it is possible to secure the heat insulating property for the portion. Therefore, the outer peripheral portions of the first and second heat insulating layers 12 and 13 are peeled off based on the action of the combustion gas while ensuring the heat insulating property to the valve bottom surface 5 as much as possible by the heat insulating layer 11 and the peripheral wall portion 16 of the covering material 15. It can be suppressed with high certainty.
  • the outer peripheral portion 11a of the heat insulating layer 11 is suppressed from being peeled based on the difference in thermal expansion or the difference in thermal contraction.
  • the present inventor has obtained knowledge that the heat insulating layer outer peripheral portion 11a tends to be peeled off from the valve bottom surface 5.
  • the heat insulating layer outer peripheral portion 11a is peeled off based on the difference in thermal expansion or thermal contraction. It is suppressed from two different viewpoints.
  • the first is that, as described above, the heat insulating layer 11 is bonded to the valve bottom surface 5 in a state where the diameter is smaller than the diameter of the valve bottom surface 5.
  • the expansion amount difference ⁇ Le and the contraction amount can be reduced by shortening the target length D that affects the thermal expansion and the thermal contraction in the formula for obtaining the expansion amount difference ⁇ Le and the contraction amount difference ⁇ Lc based on the above-described difference in thermal expansion coefficient.
  • the difference ⁇ Lc is reduced, and the target length D that affects the expansion amount difference ⁇ Le and the contraction amount difference ⁇ Lc is determined as the length of the coupling portion between the heat insulating layer 11 and the valve bottom surface 5.
  • FIG. 9 shows the experimental aspects of Experimental Examples 1 to 3 that support the above contents and the evaluation of each experimental result.
  • Experimental Examples 1 to 3 a durability test is performed on a valve having a structure peculiar to each experimental example as an experimental mode under common experimental conditions.
  • Each experimental result is evaluated by a common evaluation method. Went.
  • Insulating layer 11 (the first heat insulating layer 12, the second heat insulating layer 13) and the covering layer 17 (the bottom wall portion 17 of the covering material 15) on the valve bottom surface 5 to be tested , hereinafter, the same reference numeral 17 as the bottom wall portion 17 is used.
  • Insulating layer 11 The first and second heat insulating layers 12 and 13 shown in the first embodiment are laminated.
  • the covering layer 17 The covering material shown in the first embodiment 15 comprising only the bottom wall portion 17 Total layer thickness of the heat insulating layer and the covering layer (hereinafter referred to as the laminate 26): 120 ⁇ m Bonding between the valve bottom surface 5 and the first heat insulating layer 12, bonding between the first heat insulating layer 12 and the second heat insulating layer 13, bonding between the second heat insulating layer 13 and the covering layer 17: sintering Valve: Diameter of the valve bottom surface 5 : 32mm Material: SUH11 Experiment Content Durability test is performed on the valve 1E according to each of Experimental Examples 1 to 3 using an endurance tester 20 (valve-valve seat wear tester). As shown in FIG.
  • the inner peripheral surface 16i of the peripheral wall portion 16 of the covering material 15 extends from the valve bottom surface 5 to the surface 11s of the heat insulating layer 11 with respect to the entire peripheral surface of the heat insulating layer 11 in a reduced diameter state.
  • the one end surface of the peripheral wall portion 16 is bonded at a portion of the bulb bottom surface 5 where the heat insulating layer 11 does not exist, and the coefficient of thermal expansion of the covering material 15 is The thermal expansion coefficient is as close as possible to the thermal expansion coefficient of the valve bottom surface 5 (head part 4), and is larger than the thermal expansion coefficient of the heat insulating material 11. Thereby, in the case of thermal expansion, as shown in FIG.
  • the heat shrinkage (reduction diameter) of the peripheral wall 16 itself, and further, the heat shrinkage (reduction diameter) of the valve bottom surface 5 cooperate with each other as shown in FIG.
  • the entire circumferential surface of the layer 11 is pressed (tightened) inward in the radial direction (see the arrow in FIG. 15), and the portion of the heat insulating layer 11 that is farther from the valve bottom surface 5 receives a larger pressing force. It will be.
  • the above-mentioned shrinkage difference ⁇ Lc based on the difference in thermal expansion coefficient between the valve bottom surface 5 and the heat insulating layer 11 is reduced, and peeling of the heat insulating layer 11 due to the heat shrinkage is suppressed.
  • FIG. 16 shows the specific experimental mode of Experimental Example 4 that supports the above contents and the evaluation of each experimental result.
  • Experimental Example 4 a durability test is performed on the valve 1E having the specific structure under the above-described common experimental conditions, and the experimental results were evaluated by the same common evaluation method as described above. .
  • FIG. 18 shows the second embodiment
  • FIGS. 19 to 21 show the third embodiment
  • FIGS. 22 to 24 show the fourth embodiment
  • FIG. 25 shows the fifth embodiment
  • FIG. 26 shows the sixth embodiment.
  • the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
  • the third embodiment shown in FIGS. 19 to 21 shows a modification of the first embodiment.
  • the valve bottom surface 5 is formed with a recess 31 that extends radially outward with the radial center of the valve bottom surface 5 as the center.
  • the heat insulating layer 11 (the first heat insulating layer 12 and the second heat insulating layer 13 laminated and integrated with the first heat insulating layer 12) is accommodated in the recess 31, and the heat insulating layer is formed on the bottom wall 31b of the recess 31.
  • the entire peripheral surface 11p of the heat insulating layer 11 is bonded to the inner peripheral wall 31wi of the recess 31 as the peripheral wall (for example, sintered).
  • the surface 11s (13s) of the heat insulating layer 11 (second heat insulating layer 13) and the valve bottom surface 5 (excluding the recess 31 portion) in the recess 31 are entirely covered with the covering material 15, and the covering The material 15 is bonded (for example, sintered) to the surface 11 s of the heat insulating layer 11 and the valve bottom surface 5 in the recess 31.
  • the amount difference is reduced, and the heat shrinkage is based on the difference in thermal expansion coefficient between the recess bottom wall 31b and the first heat insulation layer 12, and the difference in thermal expansion coefficient between the first heat insulation layer 12 and the second heat insulation layer 13.
  • Each contraction amount difference is reduced, and peeling of the outer peripheral portion of the heat insulating layer 11 based on the thermal expansion or the thermal expansion coefficient difference accompanying the thermal contraction is suppressed.
  • ⁇ radius of curvature of the neutral plane N in the outer peripheral portion 11a
  • y distance from the neutral plane N
  • y / ⁇ strain
  • E longitudinal elastic modulus.
  • the bending stress ⁇ with respect to the heat insulating layer 11 is the distance ymax from the neutral surface N to the outer surface in the thickness direction of the heat insulating layer 11 when the distance y from the neutral surface N becomes the largest value.
  • the maximum value (maximum bending stress) ⁇ max increases as the distance ymax from the neutral surface N to the outer surface in the thickness direction increases.
  • the radius of curvature ⁇ tends to be smaller than the radius of curvature ⁇ ′ of the radially inner portion 11b of the outer peripheral portion 11a (the curvature tends to increase), and cracks may occur in the outer peripheral portion 11a. As is clear from the equation for obtaining the bending stress, it is larger than the outer peripheral portion 11a compared to the radially inner portion 11b.
  • the thickness of the outer peripheral portion 11a in the heat insulating layer 11 is made thinner than the thickness of the radially inner side portion 11b relative to the outer peripheral portion 11a, so that The distance y from the vertical surface N to the outer surface in the thickness direction is reduced, and the maximum bending stress ⁇ max during thermal expansion and thermal contraction is reduced. Specifically, the thickness of the radially inner side portion 11b of the heat insulating layer 11 is maintained constant with respect to the outer peripheral portion 11a, whereas the thickness of the outer peripheral portion 11a is radially outward of the heat insulating layer 11.
  • the outer peripheral edge 11aa of the heat insulating layer 11 reaches the vicinity of the outer peripheral edge of the valve bottom surface 5 with the peripheral surface of the heat insulating layer 11 having a slight thickness formed on the outer peripheral edge 11aa.
  • production of a crack can be suppressed exactly in the heat insulation layer outer peripheral part 11a, and it can suppress that the heat insulation layer outer peripheral part 11a peels from the valve
  • only the thickness of the outer peripheral portion 11a of the heat insulating layer 11 is made thinner than the thickness of the radially inner side portion 11b of the heat insulating layer 11, and becomes thinner as it goes radially outward. Therefore, the thickness of the outer peripheral portion 11a in the heat insulating layer 11 is not made as thin as possible, and the heat insulating property of the heat insulating layer 11 on the valve bottom surface 5 can be suppressed as much as possible.
  • the covering material 15 covers not only the slightly peripheral surface of the heat insulating layer outer peripheral edge 11aa but also the surface 11s of the heat insulating layer 11, while the heat insulating layer 11 and the valve bottom surface 5 are covered. Is bound to. For this reason, the same operation as that of the first embodiment is ensured with respect to the covering material 15.
  • the peripheral surface 11p of the heat insulating layer 11 is regarded as a slight thickness portion of the outer peripheral edge 11aa in the heat insulating layer 11, and the other exposed portions are regarded as the surface 11s. What includes 11a may be regarded as the peripheral surface 11p of the heat insulating layer 11.
  • a recess 31 is formed on the valve bottom surface 5 so as to extend radially outward with the radial center portion of the valve bottom surface 5 as a center.
  • the recess 31 is inclined so as to go outward in the radial direction of the recess 31 toward the opening 31 o side of the recess 31.
  • the heat insulating layer 11 is fixed (sintered) to the bottom wall 31b of the recess 31, the surface 11s of the heat insulating layer 11 is formed as a flat surface, and the peripheral surface 11p is in the thickness direction of the heat insulating layer 11. The diameter is expanded outward in the radial direction toward the surface side.
  • the surface 11 s of the heat insulating layer 11 is set to be flush with the portion of the valve bottom surface 5 excluding the recess 31, and the covering material 15 is formed on the valve bottom surface 5 accordingly. Since the surface becomes a flat surface, even when the heat insulating layer 11 is provided on the valve bottom surface 5, the entire valve bottom surface side can be flattened (flattened). The basic structure and basic performance can be secured. Moreover, the covering material 15 bonded to the surface of the heat insulating layer 11 and the valve bottom surface 5 resists the movement of the outer peripheral portion of the heat insulating layer 11 such as peeling and warping. The possibility that the part 11a is peeled can be further suppressed.
  • the sixth embodiment shown in FIG. 26 shows a modification of the fourth and fifth embodiments.
  • the same components as those in the fourth and fifth embodiments are denoted by the same reference numerals and the description thereof is omitted.
  • the surface 11s of the radially inward side portion 11b of the heat insulating layer 11 is slightly parallel to the valve bottom surface 5 (recess bottom wall 31b) on the outer side somewhat from the recess 31 opening 31o.
  • the surface 11s of the outer peripheral portion 11a of the heat insulating layer 11 is formed so as to spread radially outward as it goes inward in the thickness direction of the heat insulating layer 11 (downward in FIG. 26), and the outer edge of the surface 11s is It is supposed to be tied to the peripheral surface 11p of the heat insulating layer 11 at the position of the recess opening edge 31oo.
  • the heat insulating property of the heat insulating layer 11 is enhanced as compared with the fifth embodiment while achieving the effect of suppressing the peeling of the heat insulating layer outer peripheral portion 11a and the flattening of the entire valve bottom surface 5 side as much as possible. be able to.
  • the recess inner peripheral wall 31wi is the peripheral wall, and the surface of the heat insulating layer 11 that is in contact with the recess inner peripheral wall 31wi is regarded as the peripheral surface 11p. Not only the abutting surface but also the surface abutting the outer peripheral portion of the covering material 15 may be taken as the peripheral surface 11p. In that case, the recess inner peripheral wall 31wi and the outer peripheral portion of the covering material 15 constitute the peripheral wall. Will do.
  • the present invention includes the following aspects.
  • the wall thickness of the peripheral wall portion 16 shall not cover the entire portion of the valve bottom surface 5 where the heat insulating layer 11 does not exist.
  • SUH35 thermal conductivity: about 12.6 W / m ⁇ K (room temperature), thermal expansion coefficient: about 1.5 ⁇ 10 ⁇ 6 / ° C. (room temperature)) Etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne une soupape pour moteurs à combustion interne, qui est capable de réduire au minimum la possibilité de détachement d'une partie périphérique externe d'une couche d'isolation thermique fermement fixée à une surface inférieure de soupape. Une surface inférieure de soupape (5) est dirigée vers une chambre de combustion (S), une couche d'isolation thermique (11) est fermement fixée à la surface inférieure de soupape (5), une partie de paroi périphérique (16) est disposée d'un seul tenant avec la surface inférieure de soupape (5) de manière à entourer la couche d'isolation thermique (11), et la surface périphérique interne (16i) de la partie de paroi périphérique (16) entre en contact avec la totalité de la surface périphérique (11p) de la couche d'isolation thermique (11) sur toute la plage d'épaisseur de la surface inférieure de soupape (5) à la surface de la couche d'isolation thermique (11).
PCT/JP2018/008049 2018-03-02 2018-03-02 Soupape pour moteurs à combustion interne WO2019167260A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2020503234A JP7064250B2 (ja) 2018-03-02 2018-03-02 内燃機関用バルブ
CN201880090447.9A CN111801488A (zh) 2018-03-02 2018-03-02 内燃机用阀
KR1020207026449A KR20200124248A (ko) 2018-03-02 2018-03-02 내연기관용 밸브
PCT/JP2018/008049 WO2019167260A1 (fr) 2018-03-02 2018-03-02 Soupape pour moteurs à combustion interne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/008049 WO2019167260A1 (fr) 2018-03-02 2018-03-02 Soupape pour moteurs à combustion interne

Publications (1)

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WO2019167260A1 true WO2019167260A1 (fr) 2019-09-06

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JP (1) JP7064250B2 (fr)
KR (1) KR20200124248A (fr)
CN (1) CN111801488A (fr)
WO (1) WO2019167260A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3889401A1 (fr) * 2020-04-01 2021-10-06 Mazda Motor Corporation Soupape, moteur de structure de chambre de combustion et véhicule

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JPS5525679U (fr) * 1978-08-09 1980-02-19
WO2013081150A1 (fr) * 2011-12-02 2013-06-06 日本碍子株式会社 Structure de chambre de combustion de moteur et structure de paroi interne de trajet d'écoulement
US20140014057A1 (en) * 2012-07-11 2014-01-16 George McGinnis Heat transferring engine valve for fuel conservation
WO2015111272A1 (fr) * 2014-01-23 2015-07-30 イビデン株式会社 Matériau de base en aluminium revêtu de multiples couches

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JPS52111813U (fr) * 1976-02-21 1977-08-25
JPS54141209U (fr) * 1978-03-27 1979-10-01
US4362134A (en) * 1978-05-22 1982-12-07 Eaton Corporation Shielded valve
JPS599109U (ja) * 1982-07-09 1984-01-20 株式会社新潟鐵工所 内燃機関の給排気弁
JPS63212710A (ja) * 1987-02-28 1988-09-05 Isuzu Motors Ltd 内燃機関の吸気弁
DE10164730A1 (de) * 2001-04-07 2003-08-21 Volkswagen Ag Brennkraftmaschine mit Direkteinspritzung
DE102006053550A1 (de) * 2006-11-14 2008-05-15 Man Diesel Se Brennkraftmaschine sowie Gaswechselventil einer Brennkraftmaschine
JP5629463B2 (ja) 2007-08-09 2014-11-19 株式会社豊田中央研究所 内燃機関
JP5512256B2 (ja) * 2009-12-24 2014-06-04 愛三工業株式会社 エンジンバルブ
JP5625690B2 (ja) * 2010-09-30 2014-11-19 マツダ株式会社 エンジン用バルブ
EP2818677A4 (fr) * 2012-02-22 2015-11-25 Ngk Insulators Ltd Structure de chambre de combustion de moteur et structure de paroi intérieure de circuit fluidique

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JPS5525679U (fr) * 1978-08-09 1980-02-19
WO2013081150A1 (fr) * 2011-12-02 2013-06-06 日本碍子株式会社 Structure de chambre de combustion de moteur et structure de paroi interne de trajet d'écoulement
US20140014057A1 (en) * 2012-07-11 2014-01-16 George McGinnis Heat transferring engine valve for fuel conservation
WO2015111272A1 (fr) * 2014-01-23 2015-07-30 イビデン株式会社 Matériau de base en aluminium revêtu de multiples couches

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3889401A1 (fr) * 2020-04-01 2021-10-06 Mazda Motor Corporation Soupape, moteur de structure de chambre de combustion et véhicule

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KR20200124248A (ko) 2020-11-02
CN111801488A (zh) 2020-10-20
JP7064250B2 (ja) 2022-05-10
JPWO2019167260A1 (ja) 2021-04-01

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