WO2014125843A1 - ポペットバルブ - Google Patents
ポペットバルブ Download PDFInfo
- Publication number
- WO2014125843A1 WO2014125843A1 PCT/JP2014/050076 JP2014050076W WO2014125843A1 WO 2014125843 A1 WO2014125843 A1 WO 2014125843A1 JP 2014050076 W JP2014050076 W JP 2014050076W WO 2014125843 A1 WO2014125843 A1 WO 2014125843A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cover
- umbrella
- heat insulating
- poppet valve
- insulating member
- Prior art date
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Classifications
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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
- F01L3/12—Cooling of valves
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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
- F01L3/06—Valve members or valve-seats with means for guiding or deflecting the medium controlled thereby, e.g. producing a rotary motion of the drawn-in cylinder charge
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- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K49/00—Means in or on valves for heating or cooling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a poppet valve that opens and closes an intake port and an exhaust port of an internal combustion engine.
- the internal combustion engine is provided with poppet valves such as an intake valve that opens and closes an intake port and an exhaust valve that opens and closes an exhaust port. Since these valves are heated by the heat of the combustion chamber, when fuel or oil adheres to the valves, the volatile components are vaporized and deposits are generated. When such deposits accumulate on the umbrella portion of the poppet valve, for example, the amount of intake air flowing into the combustion chamber decreases or the flow resistance when exhaust flows out of the combustion chamber increases. Therefore, in the poppet valve described in Patent Document 1, a cover that covers the umbrella back surface of the umbrella portion is provided to prevent fuel and oil from adhering to the umbrella back surface. Further, by providing a heat insulating space between the cover and the poppet valve, the amount of heat transferred from the poppet valve to the cover is reduced, and the temperature of the cover is prevented from rising. This suppresses deposit accumulation on the cover.
- poppet valves such as an intake valve that opens and closes an intake port and an exhaust valve that opens and closes an exhaust port. Since these valves are heated
- An object of the present invention is to provide a poppet valve that can effectively suppress the temperature rise of the cover and reduce the deposit accumulation amount of the cover.
- the poppet valve that solves the above-described problems has a base end and a tip, and includes an umbrella portion that is provided at the tip and has an umbrella back surface, and a shaft that extends from the umbrella portion toward the base end.
- the poppet valve is further provided with a cover that covers at least a part of the back surface of the umbrella with a heat insulating space interposed therebetween, and a heat insulating member that is provided between the cover and the umbrella part and has a lower thermal conductivity than the umbrella part.
- a support portion that supports the cover on the umbrella portion.
- the cover is supported via a member having a lower thermal conductivity than the umbrella, it is possible to reduce the amount of heat transmitted from the umbrella to the cover and effectively suppress the temperature rise of the cover. it can. Therefore, it is possible to suppress the vapor deposition of the volatile components of the fuel and oil adhering to the surface of the cover, and to reduce the deposit accumulation amount of the cover.
- the poppet valve that solves the above-mentioned problem is a valve body having a base end and a tip, and is provided at the tip and has an umbrella back surface, and a shaft that extends from the umbrella toward the base end And a valve main body.
- the poppet valve is further provided with a cover that covers at least a part of the region including the back surface of the umbrella and the shaft portion with a heat insulating space between the cover and the valve body, and has a thermal conductivity higher than that of the valve body. And a support portion that supports the cover via a low heat insulating member.
- the cover is supported via a member having a lower thermal conductivity than the valve body, it is possible to reduce the amount of heat transferred from the valve body to the cover and effectively suppress the temperature rise of the cover. it can. Therefore, it is possible to suppress the vapor deposition of the volatile components of the fuel and oil adhering to the surface of the cover, and to reduce the deposit accumulation amount of the cover.
- the heat insulating member is formed of a material different from that of the cover, an interface made of a different material is formed at the joint between the heat insulating member and the cover, so that the amount of heat transmitted to the cover through the same interface is reduced. And the temperature rise of the cover can be further suppressed.
- the support part is disposed at both ends of the cover located near the base end and the tip end of the poppet valve (or valve body), the stability when the cover is assembled to the poppet valve is improved. To do.
- the support portion is disposed at the end portion of the cover near the tip, it is preferable that a plurality of the support portions are disposed at intervals in the circumferential direction of the umbrella portion.
- the fuel or oil that has flowed into the heat insulating space is discharged to the outside from between the circumferentially adjacent support portions at the end of the cover located near the tip of the poppet valve (or valve body). Can do. For this reason, it can suppress that fuel and oil remain in heat insulation space, and a deposit is generated.
- the support portion is located at the end portion near the base end of the cover, if the support portion is disposed over the entire circumferential direction of the umbrella portion or the shaft portion, for example, the shaft portion The fuel and oil are prevented from flowing into the heat insulation space along the surface of the. For this reason, it can suppress that fuel and oil remain in heat insulation space, and a deposit is generated.
- a poppet valve for solving the above problems has a proximal end and a distal end, an umbrella portion provided at the distal end and having an umbrella back surface, and a shaft portion extending from the umbrella portion toward the proximal end, Is provided.
- the poppet valve further includes a cover that covers the back surface of the umbrella and the shaft portion with a heat insulation space therebetween, a cover in which a portion near the base end is directly fixed to the shaft portion, and a portion near the tip end in the cover And a support part that supports the cover on the umbrella part via a heat insulating member having a lower thermal conductivity than the umbrella part.
- the cover since the cover is supported via a member having a lower thermal conductivity than the umbrella, it is possible to reduce the amount of heat transmitted from the umbrella to the cover and effectively suppress the temperature rise of the cover. it can.
- the portion of the cover located near the base end of the poppet valve is directly fixed to the shaft portion by, for example, caulking or welding, the cover is stably supported with respect to the poppet valve. Therefore, it is possible to suppress the vapor deposition of the volatile components of the fuel and oil adhering to the surface of the cover, and to reduce the deposit accumulation amount of the cover.
- a plurality of the support portions are arranged at intervals in the circumferential direction of the umbrella portion.
- the fuel or oil that has flowed into the heat insulating space can be discharged to the outside from between the support portions adjacent in the circumferential direction at the end portion of the cover located near the tip of the poppet valve. For this reason, it can suppress that fuel and oil remain in heat insulation space, and a deposit is generated.
- the cover portion located near the base end of the poppet valve is fixed to the coaxial portion in a state of being in contact with the entire circumference of the shaft portion in the circumferential direction.
- the support part includes a convex part projecting from one of the umbrella part or the shaft part and the cover toward the other, and a concave part formed on the other and fitted with the convex part. Is desirable.
- the cover can be assembled at a desired position on the back of the umbrella by fitting the convex portion provided on one of the umbrella portion or the shaft portion and the cover into the concave portion provided on the other side. it can. For this reason, the assembly of the cover and the poppet valve is facilitated.
- the heat insulating member includes a covering portion covered with a cover and an exposed portion exposed from the cover.
- the exposed portion comes into contact with the intake air to be cooled, so that the temperature rise of the heat insulating member can be suppressed and the durability thereof can be improved.
- the surface of the cover and the surface of the exposed portion are flush with each other, it is possible to suppress separation of the intake air flowing along the surface of the cover at the connection portion between the surface of the cover and the surface of the exposed portion. For this reason, it is possible to reduce the flow resistance of the intake air that passes around the intake valve and flows into the combustion chamber, and it is possible to suppress a decrease in intake efficiency due to the provision of the cover.
- the support portion is disposed at the end portion of the cover located near the tip of the poppet valve, and the surface of the exposed portion and the valve seat contact surface of the umbrella portion are flush with each other.
- the above configuration it is possible to suppress separation of the intake air flowing along the surface of the exposed portion at the connection portion between the surface of the exposed portion and the valve seat contact surface of the umbrella portion. For this reason, it is possible to reduce the flow resistance of the intake air that passes around the intake valve and flows into the combustion chamber, and it is possible to suppress a decrease in intake efficiency due to the provision of the cover. Further, in such a configuration, it is preferable that the surface of the cover and the surface of the exposed portion are flush with each other. According to this configuration, since the intake air smoothly flows along the surface of the cover, the surface of the exposed portion, and the valve seat contact surface, the flow direction of the intake air does not change suddenly. For this reason, it is possible to reduce the flow resistance of the intake air that flows around the intake valve and flows into the combustion chamber, and it is possible to further suppress a decrease in intake efficiency due to the provision of the cover.
- the heat insulating member of the support portion is formed of an elastic material, it is possible to prevent the impact when the poppet valve is seated on the cylinder head from being transmitted to the cover via the support portion. Even if there is a shape error in the cover or the poppet valve, the heat insulating member is elastically deformed to absorb the shape error, and both can be assembled stably.
- the heat insulating member is made of a material that is difficult to bend, by forming the heat insulating member into an elastically deformable shape, the same effect as when the heat insulating member is made of an elastic material can be obtained.
- the heat insulating member has an annular shape extending in the circumferential direction of the shaft portion, the cross-sectional shape along the circumferential direction is a waveform, and the end portion of the cover located near the tip of the poppet valve And the back of the umbrella.
- the heat insulating member since the amount of elastic deformation of the heat insulating member when pressed in the vertical direction of the wave is large, even if there is a shape error in the cover or poppet valve, the heat insulating member elastically deforms to absorb the shape error. Both can be assembled stably.
- the heat insulating member may be formed of a porous material.
- the porosity of the outer portion is lower than the porosity of the inner portion close to the heat insulating space.
- the heat insulating property of the heat insulating member can be improved by increasing the porosity.
- the porosity is increased in this way, fuel and oil easily enter the heat insulating member. And when fuel and oil penetrate
- the heat insulating member is formed of a porous material, and the porosity of the outer portion is lower than the porosity of the inner portion adjacent to the heat insulating space. That is, by making the porosity of the outer portion where fuel and oil are likely to adhere relatively low, the portion has a denser composition. For this reason, it becomes difficult for a fuel and oil to penetrate
- FIG. 2 is a sectional view taken along line 2-2 of FIG.
- FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 1.
- Sectional drawing of a poppet valve. (A), (b) is a perspective view of a poppet valve. (A), (b) is an enlarged view of the umbrella part of a poppet valve.
- FIG. 9 is a sectional view taken along line 9-9 in FIG. Sectional drawing of a poppet valve. Sectional drawing of a poppet valve. Sectional drawing of a poppet valve. Sectional drawing of a poppet valve. Sectional drawing which expanded the upper end part of the cover.
- (A), (b) is sectional drawing to which the upper end part of the cover was expanded. Sectional drawing which expanded the upper end part of the cover. Sectional drawing which expanded the upper end part of the cover. Sectional drawing which expanded the lower end part of the cover. Sectional drawing which expanded the lower end part of the cover. Sectional drawing which expanded the lower end part of the cover. Sectional drawing which expanded the lower end part of the cover. Sectional drawing which expanded the lower end part of the cover. Sectional drawing which expanded the lower end part of the cover. Sectional drawing which expanded the upper end part of the cover. Sectional drawing of a poppet valve. Sectional drawing of a poppet valve.
- the intake valve includes a valve body having a shaft portion 10 and an umbrella portion 11 connected to the lower end of the coaxial portion 10.
- the umbrella section 11 has a substantially circular cross section orthogonal to the axial direction of the shaft section 10, and the diameter of the umbrella section 11 increases as the valve head surface 12 is approached.
- This intake valve (valve body) is made of, for example, iron.
- an end portion provided with the umbrella portion 11 is a distal end, and an end portion opposite to the distal end is a base end. Therefore, the shaft portion 10 extends from the umbrella portion 11 provided at the distal end of the intake valve (valve body) toward the proximal end of the intake valve (valve body).
- the intake valve is provided with a substantially cylindrical cover 14 that covers the umbrella back surface 13 of the umbrella portion 11.
- the cover 14 is made of, for example, aluminum, and the diameter thereof is increased toward the tip so as to follow the shape of the umbrella back surface 13.
- the cover 14 has an upper end portion 15 located near the proximal end of the intake valve (valve body) and a lower end portion 16 located near the distal end of the intake valve (valve body). Rubbers 17 and 18 are fixed to the inner peripheral surfaces of these end portions 15 and 16 by, for example, vulcanization adhesion. More specifically, an annular rubber 17 extending over the entire circumference of the inner peripheral surface is bonded to the upper end portion 15 of the cover 14, and the inner peripheral surface of the cover 14 is attached to the lower end portion 16 of the cover 14. A plurality of rubbers 18 are bonded to each other at a predetermined interval in the direction. These rubbers 17 and 18 are heat-resistant rubbers whose thermal conductivity is lower than that of the valve body, that is, the shaft part 10 and the umbrella part 11.
- a groove 19 that is an annular recess extending over the entire circumference in the circumferential direction is provided in a portion of the shaft portion 10 that faces the upper end portion 15 of the cover 14.
- a plurality of recesses 20 are provided in a portion of the umbrella portion 11 facing the lower end portion 16 of the cover 14 at a predetermined interval in the circumferential direction. Then, the rubber 17 is fitted into the groove 19 and the rubber 18 is fitted into the recess 20, whereby the cover 14 is supported by the shaft portion 10 and the umbrella portion 11 with a predetermined distance from the umbrella back surface 13. Yes.
- the rubber 18 and the recessed portion 20 function as a support portion that supports the cover 14 on the umbrella portion 11 (valve body), and the rubber 17 and the groove 19 support the cover 14 on the shaft portion 10 (valve body). Function as. Accordingly, a heat insulating space 21 is provided between the cover 14 and the umbrella back surface 13.
- the shaft 14 and the umbrella portion 11 are covered with heat-resistant rubbers 17 and 18 whose cover 14 has a lower thermal conductivity than the shaft portion 10 and the umbrella portion 11 (valve body). Therefore, the amount of heat transferred from the shaft portion 10 and the umbrella portion 11 to the cover 14 is reduced.
- a support portion located at the upper end portion 15 of the cover 14 is disposed over the entire circumference of the umbrella portion 11, and the space between the upper end portion 15 of the cover 14 and the shaft portion 10 is sealed with rubber 17. For this reason, for example, fuel and oil are prevented from flowing into the heat insulating space 21 along the surface of the shaft portion 10. For this reason, it can suppress that fuel and oil remain in the heat insulation space 21, and a deposit is produced
- the support portions are rubber 17 and 18 which are convex portions that are bonded to the cover 14 and project toward the shaft portion 10 and the umbrella portion 11, and the rubber portions 17 and 18 that are formed on the shaft portion 10 and the umbrella portion 11. Since the fitting groove 19 and the recess 20 are included, the cover 14 can be assembled at a desired position on the umbrella back surface 13 by fitting them. For this reason, the assembly of the cover 14 and the valve body is facilitated.
- a heat-resistant rubber 17 extending over the entire circumference of the inner peripheral surface of the upper end portion 15 is fixed to the cover 14 provided in the intake valve by, for example, vulcanization adhesion.
- the lower end portion 16 of the cover 14 is provided with a plurality of projecting portions 23 that project toward the umbrella portion 11 at a predetermined interval in the circumferential direction.
- a groove 19 extending over the entire circumference in the circumferential direction is provided in a portion of the shaft portion 10 facing the upper end portion 15 of the cover 14.
- a plurality of recesses 24 are provided in a portion of the umbrella portion 11 facing the protruding portion 23 of the cover 14 at a predetermined interval in the circumferential direction.
- the inner peripheral surface of the recess 24 is covered with a thermal barrier film (TBC: Thermal Barrier Coating) 25 having a thermal barrier layer made of ceramic, for example.
- TBC Thermal Barrier Coating
- the protruding portion 23 of the cover 14 is fitted to the concave portion 24 of the umbrella portion 11 via the heat shielding film 25. Further, the rubber 17 fixed to the cover 14 and the groove 19 provided in the shaft portion 10 are fitted, whereby the upper end portion 15 of the cover 14 is supported by the shaft portion 10. That is, in this embodiment, the protrusion 23, the recess 24, and the thermal barrier coating 25 function as a support portion that supports the cover 14 on the umbrella portion 11, and the rubber 17 and the groove 19 serve to cover the shaft portion 10 with the cover 14. It functions as a support part to support.
- the cover 14 provided on the intake valve is directly fixed with its upper end portion 15 caulked against the shaft portion 10 and in contact with the coaxial portion 10 over the entire circumference thereof.
- a heat-resistant rubber 26 is fixed to the umbrella back surface 13 of the umbrella part 11 at a predetermined interval in the circumferential direction, for example, by vulcanization adhesion.
- the rubber 26 is provided with a step portion 27, and the lower end portion 16 of the cover 14 is abutted against the step portion 27. In this state, the cover 14 and the rubber 26 are bonded. Therefore, the lower end portion 16 of the cover 14 is supported on the umbrella portion 11 by the rubber 26.
- the rubber 26 has a covering portion 28 covered with the cover 14 and an exposed portion 29 exposed from the cover 14.
- the exposed portion 29 is a portion protruding outward from the cover 14 in the extending direction of the cover 14.
- the height of the stepped portion 27 is substantially the same as the thickness of the cover 14. For this reason, when the rubber 26 and the cover 14 are bonded, the surface of the exposed portion 29 of the rubber 26 and the surface of the cover 14 are flush with each other. Further, the surface of the exposed portion 29 of the rubber 26 and the valve seat contact surface 30 are also flush. Therefore, the surface of the exposed portion 29 of the rubber 26, the surface of the cover 14, and the valve seat contact surface 30 of the umbrella portion 11 are flush with each other. That is, the surface of the exposed portion 29, the surface of the cover 14, and the valve seat contact surface 30 are on the same plane.
- the intake portion 29 contacts the exposed portion 29 when the intake air flows into the combustion chamber during the intake stroke, The rubber 26 is cooled.
- the intake air flowing along the surface of the cover 14 flows between the surface of the cover 14 and the exposed portion 29. It is possible to suppress separation at the connecting portion with the surface, and separation of the intake air flowing along the surface of the exposed portion 29 at the connecting portion between the surface of the exposed portion 29 and the valve seat contact surface 30 of the umbrella portion 11. . For this reason, the intake air flows smoothly along the surface of the cover 14, the surface of the exposed portion 29, and the valve seat contact surface 30, and the flow direction of the intake air does not change suddenly.
- the upper end portion 15 of the cover 14 is caulked with respect to the shaft portion 10 and is directly fixed to the shaft portion 10 in contact with the entire circumference in the circumferential direction.
- the fuel and oil are prevented from flowing into the heat insulating space 21.
- the exposed portion 29 exposed from the cover 14 is provided on the rubber 26, and the exposed portion 29 is cooled by contacting with the intake air. For this reason, the temperature rise of the rubber
- a heat insulating member 31 is provided between the cover 14 and the umbrella portion 11.
- the heat insulating member 31 is made of a material that is not easily bent, such as ceramic or resin, and has a ring shape extending in the circumferential direction of the shaft portion 10.
- the cross-sectional shape along the circumferential direction of the shaft portion 10 of the heat insulating member 31 is a waveform, and a part of the heat insulating member 31 in the circumferential direction is divided.
- the heat insulating member 31 can be assembled to the valve body as follows, for example. That is, as shown in FIG. 6A, the heat insulating member 31 is disposed between the umbrella portion 11 and the cover 14. Then, as shown in FIG.
- the cover 14 is covered from above so that the heat insulating member 31 is pressed against the umbrella back surface 13 of the umbrella portion 11.
- the heat insulating member 31 is elastically deformed when pressed in the vertical direction of the wave.
- the upper end portion 15 of the cover 14 is caulked against the shaft portion 10 in a state where the heat insulating member 31 is elastically deformed, and the cover 14 and the shaft portion 10 are fixed.
- the heat insulating member 31 is clamped over the entire circumference in the circumferential direction by the back surface of the lower end portion 16 of the cover 14 and the umbrella back surface 13.
- the size of the gap between the cover and the umbrella when the cover is assembled to the valve body may be partially different in the circumferential direction.
- the heat insulating member is formed of a material that is difficult to bend and the cover is fixed to the umbrella portion via the heat insulating member, the heat insulating member cannot be held between the umbrella portion and the cover over the entire circumference. May not be able to be stably fixed.
- the heat insulating member 31 since the cross-sectional shape in the circumferential direction of the heat insulating member 31 is corrugated, the heat insulating member 31 is elastically deformed when pressed in the vertical direction of the wave. For this reason, as shown in FIGS. 7A and 7B, even if the size L of these gaps is changed due to the shape error of the cover 14 or the umbrella portion 11, the heat insulating member 31 is elastically deformed to cause such a gap. Change is absorbed. That is, as shown in FIG. 7B, the upper part 31a and the lower part 31b of the heat insulating member 31 come into contact with the cover 14 and the umbrella part 11 over the entire circumference, respectively.
- the amount of elastic deformation of the heat insulating member 31 is further increased by widening the gap between the divided portions of the heat insulating member 31.
- the heat insulating member 31 was formed into a ring shape, and the cross-sectional shape along the circumferential direction was corrugated.
- the heat insulating member 31 is sandwiched between the back surface of the lower end portion 16 of the cover 14 and the umbrella back surface 13 from the vertical direction of the wave. For this reason, when the cover 14 is assembled to the umbrella portion 11 via the heat insulating member 31, the heat insulating member 31 is elastically deformed, and shape errors of the cover 14 and the valve body are absorbed. As a result, the cover 14 can be stably assembled to the valve body.
- a heat insulating member 32 is provided between the lower end portion 16 of the cover 14 provided on the intake valve and the umbrella portion 11 over the entire circumference in the circumferential direction.
- the heat insulating member 32 has a ring shape and is made of a porous metal.
- the porosity of the outer peripheral portion (outer portion) is lower than the porosity of the inner peripheral portion (inner portion) adjacent to the heat insulating space 21.
- the heat insulating property of the heat insulating member can be improved by increasing the porosity.
- the porosity of the heat insulating member is increased, fuel and oil easily enter the heat insulating member. As described above, when the fuel or oil enters the inside of the heat insulating member, the pores are filled with the fuel or oil, so that the heat insulating property of the heat insulating member may be lowered.
- the heat insulating member 32 is formed of a porous metal, and the porosity of the outer portion is lower than the porosity of the inner portion close to the heat insulating space 21. That is, the outer portion to which fuel or oil adheres has a relatively low porosity so that the outer portion has a denser composition. For this reason, it becomes difficult for a fuel and oil to penetrate
- the heat insulating member 32 is formed of a porous metal and the porosity of the outer portion is lower than the porosity of the inner portion adjacent to the heat insulating space 21, fuel and oil enter the heat insulating member 32. It is possible to suppress a decrease in heat insulating property due to.
- the rubber portions 17 and 18 that are convex portions are fixed to the cover 14 and the grooves 19 and the concave portions 20 are provided in the umbrella portion 11.
- the configuration shown in FIG. 10 may be adopted.
- a groove 33 extending in the circumferential direction is provided on the inner peripheral surface of the upper end portion 15 of the cover 14 over the entire circumference or partially.
- a plurality of recesses 34 are provided on the inner peripheral surface of the lower end portion 16 of the cover 14 at a predetermined interval in the circumferential direction.
- gum 17 and 18 fixed to the axial part 10 and the umbrella part 11, for example by vulcanization adhesion, is fitted to the said groove
- the cover 14 is provided with a groove 33 and a plurality of recesses 34, the intake valve is provided with a groove 19 and a plurality of recesses 20, and the rubber 17 is fitted into the grooves 19, 33,
- the cover 14 may be assembled to the umbrella portion 11 by fitting the rubber 18 into the recesses 20 and 34, respectively.
- FIGS. 10 and 11 the example in which the support configuration in both the upper end portion 15 and the lower end portion 16 of the cover 14 is changed is shown. However, only one of the upper end portion 15 and the lower end portion 16 is shown. You may make it employ
- the structure shown in FIG.10 and FIG.11 can also be employ
- the plurality of rubbers 18 are arranged at predetermined intervals in the circumferential direction on the inner peripheral surface of the lower end portion 16 of the cover 14.
- an annular rubber extending over the entire circumference in the circumferential direction may be disposed on the inner peripheral surface of the lower end portion 16 of the cover 14 to seal the lower end portion of the heat insulating space 21.
- the rubber 17 is fixed to the upper end portion 15 of the cover 14 and the groove 19 in which the rubber 17 is fitted is provided in the shaft portion 10, but the rubber 17 is fixed to the shaft portion 10.
- a groove extending in the circumferential direction may be provided on the inner peripheral surface of the upper end portion 15 of the cover 14 over the entire circumference or partially, and the rubber 17 may be fitted into the groove.
- the protrusion part 23 was provided in the lower end part 16 of the cover 14, and the recessed part 24 was provided in the umbrella part 11, the protrusion part 23 was provided in the umbrella part 11, and the protrusion part 23 was fitted.
- a concave portion to be joined may be provided in the cover 14. In such a case, it is preferable to cover the inner peripheral surface of the recess provided in the lower end portion 16 of the cover 14 with the thermal barrier coating 25. Even with such a configuration, the same effects as the above (1) to (7) can be obtained.
- the plurality of protrusions 23 are provided at predetermined intervals in the circumferential direction at the lower end portion 16 of the cover 14. You may make it provide the cyclic
- the second embodiment may be modified as shown in FIG. 12, for example.
- the same components as those of the second embodiment are denoted by common reference numerals, and detailed description thereof is omitted.
- the cover 14 of the intake valve is provided with a plurality of protrusions 23 at the lower end 16 thereof. Further, a portion of the umbrella back surface 13 of the umbrella portion 11 that faces the protruding portion 23 is covered with a thermal barrier coating 25. And this thermal-insulation film
- the rubbers 17 and 18 are used as the heat insulating member having a lower thermal conductivity than that of the umbrella portion 11, but other heat insulating members such as ceramic and resin may be used. Even with such a configuration, the same effects as in the above (1) to (6) can be obtained.
- the rubber 17 is disposed on the inner peripheral surface of the upper end portion 15 of the cover 14.
- FIGS. 13 to 15 are enlarged cross-sectional views of the upper end portion 15 of the cover 14.
- FIG. 13 to FIG. 15 the same configurations as those of the embodiments are denoted by the same reference numerals and detailed description thereof will be given. Is omitted.
- a ring-shaped rubber 35 is fixed to the upper end portion 15 of the cover 14 so as to cover the tip of the cover 14.
- the inner diameter of the rubber 35 is slightly smaller than the outer diameter of the shaft portion 10. Therefore, when the shaft portion 10 is inserted into the hole 36 of the ring-shaped rubber 35, the inner peripheral surface of the rubber 35 and the shaft portion 10 are brought into close contact with each other by the action of elastic force.
- the upper end portion 15 of the cover 14 is bent in a direction away from the shaft portion 10 (outside in the radial direction).
- a ring-shaped rubber 37 is fixed to the upper surface of the upper end portion 15.
- the inner diameter of the rubber 37 is smaller than the outer diameter of the shaft portion 10.
- the shaft portion 10 is provided with a groove 38 extending over the entire circumference.
- the groove 38 of the shaft portion 10 may be omitted. That is, the rubber 37 and the shaft portion 10 may be brought into close contact with each other by a reaction force generated by elastic deformation of the rubber 37.
- the upper end portion 15 of the cover 14 is supported by the shaft portion 10 via the rubber 17, but when the temperature of the shaft portion 10 is not so high, FIG. As shown, the upper end 15 of the cover 14 may be fixed directly over the entire circumference of the shaft 10. At this time, for example, the upper end portion 15 of the cover 14 may be caulked and fixed to the shaft portion 10, or the upper end portion 15 of the cover 14 may be fixed to the shaft portion 10 by welding. Even with such a configuration, the cover 14 is supported by the umbrella portion 11 having a high temperature in the intake valve via the rubber 18 and the thermal barrier coating 25, so that the same effects as the above (1) to (5) can be obtained. .
- the annular rubber 17 extending over the entire circumference in the circumferential direction is disposed on the inner circumferential surface of the upper end 15 of the cover 14, but the upper end 15 of the cover 14 is arranged.
- a plurality of rubbers may be arranged at intervals in the circumferential direction. Even with this configuration, the same effects as in the above (1) to (4) can be obtained.
- FIGS. 17 to 21 are enlarged sectional views of the lower end portion 16 of the cover 14.
- FIGS. 17 to 21 the same components as those of the third embodiment are denoted by the same reference numerals and their details are given. The detailed explanation is omitted.
- a convex portion 41 that protrudes toward the umbrella portion 11 is formed on the rubber 40 that supports the cover 14, and a concave portion 42 that fits the convex portion 41 is formed on the umbrella portion 11. And the rubber 40 is being fixed to the umbrella part 11 by these convex parts 41 and the recessed part 42 fitting.
- the rubber 40 and the umbrella part 11 can be further easily assembled. Note that the same effect can be obtained even when a convex portion that protrudes toward the rubber 40 is provided on the umbrella portion 11 and a concave portion that fits into the convex portion is formed on the rubber 40.
- the cover 14 is supported by the umbrella back surface 13 via the rubber 43, but the surface of the exposed portion 44 of the rubber 43 and the surface of the cover 14 are It is not flush. Even with such a configuration, the same effects as in the above (1) to (4), (7) to (9), and (11) can be obtained.
- the surface of the exposed portion 46 of the rubber 45 is not flush with the valve seat contact surface 30 of the umbrella portion 11. Even with such a configuration, the same effects as in the above (1) to (4) and (7) to (10) can be obtained.
- the exposed portions 48, 50 of the rubbers 47, 49 may not be flush with the surface of the cover 14 and the valve seat contact surface 30 of the umbrella portion 11. Even with such a configuration, the same effects as in the above (1) to (4) and (7) to (9) can be obtained.
- FIGS. 17-21 it can change into the rubber 40, 43, 45, 47 as a heat insulation member, and can also be set as the same structure using the heat insulation member which consists of ceramics, resin, etc.
- FIG. 17-21 it can change into the rubber 40, 43, 45, 47 as a heat insulation member, and can also be set as the same structure using the heat insulation member which consists of ceramics, resin, etc.
- the upper end portion 15 of the cover 14 is caulked to the shaft portion 10 to fix the cover 14 directly to the shaft portion 10, but other methods such as welding may be used. Alternatively, the cover 14 may be directly fixed to the shaft portion 10.
- the upper end portion 15 of the cover 14 is directly fixed to the shaft portion 10, but may be modified as shown in FIG.
- the upper end portion 15 of the cover 14 is fixed to the shaft portion 10 via an annular rubber 51.
- a step portion 52 is provided in the rubber 51, and the upper end portion 15 of the cover 14 is fixed to the step portion 52.
- the height of the stepped portion 52 is substantially the same as the thickness of the cover 14, and when the rubber 51 and the cover 14 are fixed, the surface of the exposed portion 53 of the rubber 51 and the surface of the cover 14 are flush with each other. ing.
- the upper end portion 15 of the cover 14 is fixed to the coaxial portion 10 in contact with the entire circumference of the shaft portion 10, but the upper end portion 15 of the cover 14 is fixed to the coaxial portion 10. You may make it fix to the axial part 10 in the state contact
- the heat insulating member 31 has an annular shape, and the cross-sectional shape along the circumferential direction thereof is corrugated to give elasticity.
- FIG. 23 and FIG. 24 the same components as those in the fourth embodiment are denoted by common reference numerals, and detailed description thereof is omitted.
- the heat insulating member 54 is sandwiched between the lower end portion 16 of the cover 14 and the umbrella portion 11.
- the heat insulating member 54 is made of a material that is not easily bent, such as ceramic or resin, and has a ring shape that extends in the circumferential direction of the umbrella portion 11.
- a recess 55 is provided on the surface of the heat insulating member 54 facing the umbrella portion 11.
- the umbrella part 11, the heat insulating member 54, and the cover 14 are assembled by the same method as in the fourth embodiment.
- the heat insulating member 56 has a ring shape extending in the circumferential direction of the umbrella portion 11, and has a convex portion 57 protruding toward the heat insulating space 21.
- a stepped portion 58 is formed on the heat insulating member 56 by the convex portion 57, and the cover 14 is fixed to the stepped portion 58.
- the heat insulating member 56 is made of a material that is not easily bent, such as ceramic or resin.
- the umbrella part 11, the heat insulating member 56, and the cover 14 are assembled by the same method as in the fourth embodiment.
- the heat insulating members 54 and 56 are ring-shaped, and the heat insulating members 54 and 56 are provided over the entire circumference of the umbrella portion 11. You may make it arrange
- the upper end portion 15 of the cover 14 is fixed to the coaxial portion 10 in contact with the entire circumference of the shaft portion 10, but the upper end portion 15 of the cover 14 is fixed to the coaxial portion 10. You may make it fix to the axial part 10 in the state contact
- porous metal used as the porous material
- other materials such as ceramic and resin may be used as long as the porous material is used.
- depositing deposits on the cover 14 can be further suppressed by applying a deposit suppressing treatment agent to the surface of the cover 14. And in such a case, since the thermal load of the deposit suppression processing agent is reduced by suppressing the temperature rise of the cover 14, the durability of the deposit suppression processing agent can be improved.
- the configuration other than the configuration in which a part of the heat insulating member is exposed from the cover in order to cool the heat insulating member by intake air can be applied to the exhaust valve.
- SYMBOLS 10 Shaft part, 11 ... Umbrella part, 12 ... Valve head surface, 13 ... Umbrella back surface, 14 ... Cover, 15 ... Upper end part, 16 ... Lower end part, 17, 18, 26, 35, 37, 40, 43, 45 , 47, 49, 51 ... rubber, 19, 33 ... groove, 20, 24, 34 ... recess, 21 ... heat insulation space, 22 ... gap, 23 ... projection, 25 ... thermal barrier coating, 27, 52, 58 ... step 28, covering portion, 29, 44, 46, 48, 50, 53 ... exposed portion, 30 ... valve seat contact surface, 31, 32, 54, 56 ... heat insulating member, 31a ... upper portion, 31b ... lower portion, 36 , 39 ... holes, 38 ... grooves, 41 ... convex parts, 42 ... concave parts, 55 ... depressions, 57 ... convex parts.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fuel-Injection Apparatus (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Thermal Insulation (AREA)
- Temperature-Responsive Valves (AREA)
Abstract
Description
以下、ポペットバルブを内燃機関の吸気バルブとして具体化した第1の実施形態について、図1~図3を参照して説明する。
以下、ポペットバルブの第2の実施形態について、図4を参照して説明する。なお、第1の実施形態と同様の構成については、共通の符号を付してその詳細な説明は省略する。
以下、ポペットバルブの第3の実施形態について、図5を参照して説明する。本実施形態では、カバー14の上端部15をかしめることによって同カバー14を軸部10に固定している点や、カバー14の下端部16に設けられた支持部の構成が上記各実施形態と異なっている。なお、上記各実施形態と同様の構成については、共通の符号を付してその詳細な説明は省略する。
以下、ポペットバルブの第4の実施形態について、図6及び図7を参照して説明する。本実施形態では、カバー14の下端部16に設けられた断熱部材の構成が上記第3の実施形態と異なっている。なお、第3の実施形態と同様の構成については、共通の符号を付してその詳細な説明は省略する。
以下、ポペットバルブの第5の実施形態について、図8及び図9を参照して説明する。本実施形態では、カバー14の下端部16に設けられた断熱部材の構成が上記第3の実施形態と異なっている。なお、上記第3の実施形態と同様の構成については、共通の符号を付してその詳細な説明は省略する。
なお、上記各実施形態は、以下のように変更して実施することもできる。また、上記各実施形態及び以下の変更例を適宜組み合わせて実施することもできる。
Claims (18)
- 基端及び先端を有するポペットバルブであって、
前記先端に設けられ、傘裏面を有する傘部と、
前記傘部から前記基端に向かって延びる軸部と、
前記傘裏面の少なくとも一部を断熱空間を隔てて覆うカバーと、
前記カバーと前記傘部との間に設けられ、同傘部よりも熱伝導率の低い断熱部材を介して前記カバーを前記傘部に支持する支持部と、
を備えるポペットバルブ。 - 基端及び先端を有するバルブ本体であって、前記先端に設けられて傘裏面を有する傘部と、前記傘部から前記基端に向かって延びる軸部と、を含むバルブ本体と、
前記傘裏面及び前記軸部を含む領域の少なくとも一部を断熱空間を隔てて覆うカバーと、
前記カバーと前記バルブ本体との間に設けられ、同バルブ本体よりも熱伝導率の低い断熱部材を介して前記カバーを支持する支持部と、
を備えるポペットバルブ。 - 前記断熱部材は前記カバーとは異なる材料からなる
請求項1または請求項2に記載のポペットバルブ。 - 前記支持部は前記カバーにおける前記基端寄りの端部及び前記先端寄りの端部にそれぞれ配設される
請求項1~3のいずれか一項に記載のポペットバルブ。 - 前記支持部は前記カバーにおける前記先端寄りの端部に位置し、前記傘部の周方向に間隔を隔てて複数配設される
請求項1~3のいずれか一項に記載のポペットバルブ。 - 前記支持部は前記カバーにおける前記基端寄りの端部に位置し、前記傘部又は前記軸部の周方向全周に亘って配設される
請求項1~3のいずれか一項に記載のポペットバルブ。 - 基端及び先端を有するポペットバルブであって、
前記先端に設けられ、傘裏面を有する傘部と、
前記傘部から前記基端に向かって延びる軸部と、
前記傘裏面及び前記軸部を断熱空間を隔てて覆うカバーであって、前記基端寄りの部分が前記軸部に直接固定されるカバーと、
前記カバーにおける前記先端寄りの部分に設けられ、前記傘部よりも熱伝導率の低い断熱部材を介して前記カバーを前記傘部に支持する支持部と、
を備えるポペットバルブ。 - 前記支持部は前記傘部の周方向に間隔を隔てて複数配設される
請求項7に記載のポペットバルブ。 - 前記カバーにおける前記基端寄りの部分は前記軸部の周方向全周に亘って当接した状態で同軸部に固定される
請求項7又は8に記載のポペットバルブ。 - 前記支持部は、前記傘部又は前記軸部と前記カバーとのうちの一方から他方に向けて突出する凸部と、前記他方に形成されて前記凸部と嵌合する凹部とを含む
請求項1~9のいずれか一項に記載のポペットバルブ。 - 前記ポペットバルブは吸気バルブであり、
前記断熱部材は、前記カバーに覆われた被覆部と同カバーから露出した露出部とを含む
請求項1~10のいずれか一項に記載のポペットバルブ。 - 前記カバーの表面と前記露出部の表面とが面一である
請求項11に記載のポペットバルブ。 - 前記支持部は前記カバーにおける前記先端寄りの端部に位置し、前記露出部の表面と前記傘部の弁座当接面とが面一である
請求項11又は12に記載のポペットバルブ。 - 前記断熱部材は弾性材料からなる
請求項1~13のいずれか一項に記載のポペットバルブ。 - 前記断熱部材は弾性変形可能な形状を有する
請求項1~14のいずれか一項に記載のポペットバルブ。 - 前記断熱部材は、前記軸部の周方向に延びる環形状を有し、同周方向に沿った断面形状が波形であり、前記カバーにおける前記先端寄りの端部と前記傘裏面とにより挟持される
請求項1~4及び7のいずれか一項に記載のポペットバルブ。 - 前記断熱部材はその周方向における一部が分断されている
請求項16に記載のポペットバルブ。 - 前記断熱部材は多孔質材料からなり、同断熱部材は前記断熱空間に近接する内側部分及びそれとは反対側の外側部分を有し、内側部分の気孔率よりも外側部分の気孔率が低い
請求項1~17のいずれか一項に記載のポペットバルブ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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JP2015500156A JP6070816B2 (ja) | 2013-02-15 | 2014-01-07 | ポペットバルブ |
DE112014000833.8T DE112014000833T5 (de) | 2013-02-15 | 2014-01-07 | Tellerventil |
CN201480008254.6A CN104995377B (zh) | 2013-02-15 | 2014-01-07 | 提升阀 |
US14/765,026 US9726055B2 (en) | 2013-02-15 | 2014-01-07 | Poppet valve |
Applications Claiming Priority (2)
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JP2013027987 | 2013-02-15 | ||
JP2013-027987 | 2013-02-15 |
Publications (1)
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WO2014125843A1 true WO2014125843A1 (ja) | 2014-08-21 |
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PCT/JP2014/050076 WO2014125843A1 (ja) | 2013-02-15 | 2014-01-07 | ポペットバルブ |
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US (1) | US9726055B2 (ja) |
JP (1) | JP6070816B2 (ja) |
CN (1) | CN104995377B (ja) |
DE (1) | DE112014000833T5 (ja) |
WO (1) | WO2014125843A1 (ja) |
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CN106121760A (zh) * | 2016-07-22 | 2016-11-16 | 山东大学 | 产生进气涡流的带螺旋通道的进气门及内燃机 |
JP2016217199A (ja) * | 2015-05-15 | 2016-12-22 | トヨタ自動車株式会社 | 内燃機関の吸気弁 |
WO2022201572A1 (ja) * | 2021-03-24 | 2022-09-29 | 日立グローバルライフソリューションズ株式会社 | 冷蔵庫及び収納箱組 |
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US9706607B2 (en) * | 2014-12-10 | 2017-07-11 | Lg Display Co., Ltd. | Flexible display device with multiple types of micro-coating layers |
JP6597663B2 (ja) * | 2017-02-08 | 2019-10-30 | トヨタ自動車株式会社 | エンジンバルブ |
CN107939470A (zh) * | 2017-04-17 | 2018-04-20 | 赵毛兴 | 一种带隔热套的防止高温失效的发动机气门 |
WO2018191951A1 (zh) * | 2017-04-17 | 2018-10-25 | 赵毛兴 | 一种带隔热套的防止高温失效的发动机气门 |
US10746062B2 (en) * | 2018-04-04 | 2020-08-18 | Freudenberg Sealing Technologies S.A.S. Di Externa Italia S.R.L.U. | Gasket with an improved heat dissipation capacity for a valve of an internal combustion engine |
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Also Published As
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CN104995377B (zh) | 2018-01-02 |
US20150369091A1 (en) | 2015-12-24 |
CN104995377A (zh) | 2015-10-21 |
DE112014000833T5 (de) | 2015-11-05 |
US9726055B2 (en) | 2017-08-08 |
JPWO2014125843A1 (ja) | 2017-02-02 |
JP6070816B2 (ja) | 2017-02-01 |
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