WO2015170384A1 - Soupape champignon creuse - Google Patents

Soupape champignon creuse Download PDF

Info

Publication number
WO2015170384A1
WO2015170384A1 PCT/JP2014/062374 JP2014062374W WO2015170384A1 WO 2015170384 A1 WO2015170384 A1 WO 2015170384A1 JP 2014062374 W JP2014062374 W JP 2014062374W WO 2015170384 A1 WO2015170384 A1 WO 2015170384A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
diameter hollow
hollow portion
diameter
small
Prior art date
Application number
PCT/JP2014/062374
Other languages
English (en)
Japanese (ja)
Inventor
基治 鈴木
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 PCT/JP2014/062374 priority Critical patent/WO2015170384A1/fr
Publication of WO2015170384A1 publication Critical patent/WO2015170384A1/fr

Links

Images

Classifications

    • 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
    • F01L3/14—Cooling of valves by means of a liquid or solid coolant, e.g. sodium, in a closed chamber in a valve
    • 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 hollow poppet valve in which a coolant is loaded in a hollow portion formed from the umbrella portion to the shaft portion of the poppet valve.
  • a hollow part is formed from the umbrella part of the poppet valve integrally formed on one end side of the shaft part to the shaft part, and has a higher thermal conductivity than the base material of the valve.
  • a hollow poppet valve is described in which a coolant (eg, metallic sodium, melting point about 98 ° C.) is loaded into the hollow portion with an inert gas.
  • the thermal conductivity of the valve (hereinafter referred to as the heat extraction effect of the valve) can be improved. it can.
  • the combustion chamber becomes hot due to the driving of the engine, but if the temperature of the combustion chamber is too high, knocking occurs and a predetermined engine output cannot be obtained, leading to deterioration of fuel consumption (deterioration of engine performance). Therefore, as a method of actively conducting heat generated in the combustion chamber through the valve in order to lower the temperature of the combustion chamber (a method for increasing the heat-sucking effect of the valve), the coolant is hollowed together with the inert gas.
  • Various hollow valves loaded in the box have been proposed.
  • the communication portion between the disk-shaped large-diameter hollow portion in the umbrella portion and the linear small-diameter hollow portion in the shaft portion is a smooth curved region (the inner diameter gradually increases).
  • This transition area is configured to be smoothly continuous, so that the coolant (liquid) fills the gas when the valve opens and closes (the valve reciprocates in the axial direction).
  • the large-diameter hollow portion and the small-diameter hollow portion can move smoothly, and the heat-drawing effect of the valve is improved.
  • the coolant (liquid) moves smoothly between the large-diameter hollow part and the small-diameter hollow part according to the opening / closing operation of the valve.
  • the coolant (liquid) in the hollow portion moves in the axial direction in a state where the upper layer portion, the middle layer portion, and the lower layer portion are maintained in a vertical relationship without being stirred.
  • Patent Document 3 by providing stepped irregularities on the inner peripheral surface of the smooth communication portion between the large-diameter hollow portion and the small-diameter hollow portion, the contact area of the coolant (liquid) with the valve increases. Further, since the coolant is stirred by the unevenness, the heat transfer property is improved.
  • the inner peripheral surface of the communication part has a shape in which the inner diameter gradually changes due to the stepped irregularities, so that when the valve reciprocates in the axial direction, the coolant in the large-diameter hollow part is positively It is not agitated, and it cannot be said that the heat pulling effect (thermal conductivity) is sufficiently exhibited.
  • Patent Document 4 (WO2104 / 054113, published on April 10, 2014) was proposed.
  • the large-diameter hollow portion in the umbrella portion in communication with the small-diameter hollow portion in the shaft portion is formed into a truncated cone shape, and the opening peripheral portion of the small-diameter hollow portion constituting the top surface of the large-diameter hollow portion is defined as the center of the valve.
  • a circulating flow (convection) in the longitudinal direction is formed around the central axis of the valve in the coolant (liquid) in the large-diameter hollow portion of the valve that reciprocates in the axial direction.
  • the entire coolant in the large-diameter hollow portion is actively stirred, and the heat-drawing effect (thermal conductivity) is improved.
  • the inventor has focused on the maximum temperature (Tmax) point appearing in the fillet portion that curves between the umbrella portion and the shaft portion. That is, in the prior art document 4, the small-diameter hollow portion on the shaft portion side and the large-diameter hollow portion on the umbrella portion side communicate at right angles in the fillet portion, and the fillet portion is thicker than the shaft portion and the umbrella portion, In particular, when used as an exhaust valve, it is considered that the highest temperature point comes to the fillet portion because heat tends to accumulate in the thick fillet portion that is the most exposed portion to the high-temperature exhaust gas.
  • the maximum temperature appearing in the fillet portion may be lowered, that is, the heat of the fillet portion is efficiently
  • the fillet portion forming wall should be made thin and the coolant corresponding to the fillet portion of the hollow portion should be actively stirred.
  • a frustoconical large-diameter hollow part is provided in the umbrella part, and the small-diameter hollow part in the shaft part communicates perpendicularly to the ceiling surface of the large-diameter hollow part (conical frustum).
  • the peripheral edge of the opening to the valve section is a plane perpendicular to the central axis of the valve, and the coolant in the large-diameter hollow part of the valve that reciprocates in the axial direction circulates inward in the vertical direction around the central axis of the valve.
  • a hollow part with a medium-diameter hollow part with an enlarged inner diameter is provided at the communicating part of the hollow part with the large-diameter hollow part, and the peripheral edge of the opening to the medium-diameter hollow part of the small-diameter hollow part is substantially perpendicular to the central axis of the valve.
  • the cooling inside the hollow inner diameter of the valve that reciprocates in the axial direction We considered a new structure that "form longitudinal circulation stream (convection) in wood.
  • the present invention has been made in view of the above-described problems of the prior art, and its purpose is to promote the stirring of the coolant in the hollow portion when the valve reciprocates in the axial direction, thereby improving the heat-drawing effect. It is to provide a hollow poppet valve.
  • the hollow portion is formed from the umbrella portion of the poppet valve integrally formed at the shaft end portion to the shaft portion,
  • the hollow poppet valve in which the hollow portion is filled with a coolant In the umbrella part, a frustoconical large-diameter hollow part having a tapered outer peripheral surface following the outer shape of the umbrella part is provided,
  • a linear small-diameter hollow portion that communicates with the large-diameter hollow portion is provided in the shaft portion, and a medium-diameter hollow whose inner diameter is increased at the communicating portion of the small-diameter hollow portion with the large-diameter hollow portion.
  • a first circulating flow (convection) in the longitudinal direction around the central axis of the valve is formed in the coolant (liquid) of the large-diameter hollow portion, and the medium diameter
  • a second circulating flow (convection) in the vertical direction is formed in the coolant in the hollow portion.
  • the opening periphery to the large-diameter hollow portion and the opening periphery to the medium-diameter hollow portion of the small-diameter hollow portion are each configured by a plane orthogonal to the central axis of the valve, but the medium-diameter hollow of the small-diameter hollow portion
  • the peripheral edge of the opening to the portion may be formed of a tapered surface inclined at a predetermined angle with respect to the central axis of the valve, and the inclination of the tapered surface is in the range of 60 degrees or less (30 degrees or less with respect to the plane perpendicular to the central axis).
  • a valve constituting a valve mechanism for an automobile is driven by a cam that rotates in synchronization with a crankshaft (reciprocating operation in the axial direction).
  • inertia forces Wa and Wb act on the liquid.
  • the coolant in the hollow portion is strongly influenced by the inertial force acting when the valve is seated, and as shown in FIGS. 3 (a), 3 (b), and FIG.
  • a circulation flow (convection) T1 and a second circulation flow (convection) T2 are formed, and the inside of the hollow portion is actively stirred.
  • the upward inertia force Wa acts on the coolant in the hollow portion as shown in FIG. F1 occurs.
  • the ceiling surface of the large-diameter hollow part (the peripheral edge of the opening of the medium-diameter hollow part in the large-diameter hollow part) and the ceiling surface in the medium-diameter hollow part (the peripheral edge of the opening of the small-diameter hollow part) are, for example, orthogonal to the central axis of the valve Therefore, unlike the conventional hollow valve in which the communication part between the hollow parts is formed in a smooth shape, the coolant cannot move smoothly upward.
  • the coolant in the large-diameter hollow portion includes the center (radially inner side) of the communication portion P1 from the tapered outer peripheral surface along the annular step portion (the ceiling surface of the large-diameter hollow portion) and the medium-diameter hollow portion.
  • the coolant in the medium-diameter hollow portion is communicated with the small-diameter hollow portion from the outer peripheral surface of the medium-diameter hollow portion along the annular stepped portion (the ceiling surface of the medium-diameter hollow portion).
  • a flow F5 toward the center (radially inward) of the part P2 is generated.
  • the coolant in the hollow portion has a downward inertia as shown in FIG. Since the force Wb acts, a flow F3 is generated that is directed downward and radially outward along the bottom surface in the large-diameter hollow portion.
  • the coolant in the large-diameter hollow portion is combined with the flows F2 and F3, and the first circulation in the longitudinal direction around the central axis of the valve.
  • a flow (convection) T1 is formed.
  • the valve reciprocates in the axial direction, whereby a first circulating flow (convection) T1 in the longitudinal direction around the central axis of the valve is formed in the coolant in the large-diameter hollow portion, A second circulating flow (convection) T2 in the vertical direction is formed in the coolant in the medium-diameter hollow portion, and the coolant in the hollow portion is actively agitated, so that the heat drawing effect of the valve (thermal conductivity) ) Is significantly improved.
  • the medium-diameter hollow portion is provided at a position corresponding to the fillet portion between the umbrella portion and the shaft portion.
  • an inner diameter of the small-diameter hollow portion near the valve shaft end portion is formed larger than an inner diameter of the small-diameter hollow portion near the valve umbrella portion.
  • An annular step portion is provided at a predetermined axial position in the small-diameter hollow portion, and the coolant is loaded to a position beyond the step portion.
  • the turbulent flow generated in the vicinity of the stepped portion when the coolant moves in the axial direction in the small-diameter hollow portion in accordance with the opening / closing operation (vertical reciprocating operation) of the valve is caused by the coolant in the small-diameter hollow portion.
  • the opening / closing operation vertical reciprocating operation
  • the stepped portion in the small-diameter hollow portion when the stepped portion in the small-diameter hollow portion is disposed in an exhaust passage or an intake passage where the valve opens to a combustion chamber of an engine, It is configured to be provided at a predetermined position that does not fall within the exhaust passage or the intake passage.
  • the fatigue strength does not decrease in the region near the shaft end in the valve shaft portion than in the region near the valve umbrella portion, even if it is formed thinly (the inner diameter of the small-diameter hollow portion is increased), the strength (due to fatigue) There is no problem in durability such as breakage.
  • the inner diameter of the small-diameter hollow portion near the shaft end is increased, firstly, the surface area (contact surface area with the coolant) of the entire small-diameter hollow portion increases, and the heat transfer efficiency in the valve shaft portion increases. Second, the volume of the entire small-diameter hollow portion increases, and the total weight of the valve can be reduced. Third, by increasing the charging amount of the coolant, the heat drawing effect (thermal conductivity) of the valve shaft portion is increased. And the heat-drawing effect of a valve
  • the stepped portion in the small-diameter hollow portion is substantially at a predetermined position that is not at least in the exhaust passage or the intake passage when the valve is fully opened (for example, at the end of the valve guide facing the exhaust passage or the intake passage). It is most desirable to provide at the corresponding position.
  • the amount of coolant charged in the hollow portion increases, and the contact area with the coolant on the inner peripheral surface of the hollow portion also increases, so the heat drawing effect (thermal conductivity) of the valve is improved. As a result, engine performance is improved.
  • a circulation flow is formed in the longitudinal direction around the central axis of the valve, and in the medium-diameter hollow portion, a longitudinal circulation flow is also formed in the hollow portion. Since the coolant in the entire section is actively agitated, the heat-sucking effect (thermal conductivity) of the valve is improved, and the engine performance is improved.
  • the heat transfer action in the fillet portion is surely enhanced, the heat drawing effect (heat conductivity) of the valve is further improved, and the engine performance is further improved.
  • turbulent flow is generated in the vicinity of the stepped portion in the small-diameter hollow portion along with the opening / closing operation (reciprocating operation in the vertical direction) of the valve, and at least the upper layer of the coolant in the hollow portion Since the middle layer part is stirred from the part, the heat transfer by the coolant in the hollow part becomes active, the heat drawing effect (thermal conductivity) of the valve is further improved, and the engine performance is further improved.
  • the hollow poppet valve of the fourth aspect since the inner diameter of the small-diameter hollow portion near the shaft end portion in the valve shaft portion is increased within a range that does not affect the durability, the heat drawing effect of the valve shaft portion (heat (Conductivity) is further improved, and the total weight of the valve is reduced, further improving the engine performance.
  • FIG. 1 It is a longitudinal cross-sectional view of the hollow poppet valve which is the 1st Example of this invention. It is a figure which shows the inertial force which acts on the coolant in a hollow part at the time of the same hollow poppet valve reciprocatingly, (a) is sectional drawing which shows the inertial force which acts on the coolant at the time of valve seating, (b) ) Is a cross-sectional view showing the inertial force acting on the coolant when the valve shifts from the valve opening operation to the valve closing operation (from falling to rising).
  • (A) is an enlarged view showing the movement of the coolant in the hollow portion when the hollow poppet valve opens and closes (reciprocates in the axial direction), and (a) shows that the engine starts and the valve shifts from the seated state to the valve open state. It is a figure which shows the motion of the coolant at the time of carrying out, (b) is a figure which shows the motion of the coolant at the time of a valve
  • FIGS. 4A and 4B are diagrams showing a manufacturing process of the hollow poppet valve, wherein FIG. 4A shows a hot forging process for forging a shell which is an intermediate product of the valve, and FIG. 4B shows a hole corresponding to a small-diameter hollow portion formed in a shaft portion.
  • (C) shows a hole drilling process for drilling a hole corresponding to the medium-diameter hollow part in the fillet part, and (d) shows a hole corresponding to the small-diameter hollow part near the shaft end part.
  • (E) shows an axial contact process for axially contacting the shaft end member,
  • (f) shows a process for filling the small-diameter hollow portion with a coolant, and
  • (g) shows an inert gas.
  • the process of welding a cap to the opening part of the recessed part (large diameter hollow part) of an umbrella outer shell under atmosphere (large diameter hollow part sealing process) is shown. It is a longitudinal cross-sectional view of the hollow poppet valve which is the 2nd Example of this invention.
  • FIG. 1 to 4 show a hollow poppet valve for an internal combustion engine according to a first embodiment of the present invention.
  • reference numeral 10 denotes a heat-resistant alloy in which an umbrella portion 14 is integrally formed on one end side of a shaft portion 12 that extends straight through an R-shaped fillet portion 13 that gradually increases in outer diameter.
  • a tapered face portion 16 is provided on the outer periphery of the umbrella portion 14.
  • a shaft-integrated shell (hereinafter simply referred to as a shell) 11 (see FIGS. 1 and 6), which is a valve intermediate product in which an umbrella outer shell 14a is integrally formed on one end of a cylindrical shaft portion 12a;
  • the shaft end member 12b axially contacted with the shaft portion 12a of the shell 11 and the disc-shaped cap 18 welded to the opening portion 14c in the frustoconical recess 14b of the umbrella outer shell 14a of the shell 11
  • a hollow poppet valve 10 having a hollow portion S is formed from the portion 14 to the shaft portion 12.
  • the hollow portion S is filled with a coolant 19 such as metallic sodium together with an inert gas such as argon gas.
  • a larger amount of the coolant 19 is more excellent in the heat-drawing effect, a difference in heat-drawing effect is small if the amount is larger than a predetermined amount, so that cost-effectiveness (the more the coolant 19 is, the higher the cost). For example, an amount of about 1/2 to about 4/5 of the volume of the hollow portion S may be loaded.
  • reference numeral 2 denotes a cylinder head
  • reference numeral 6 denotes an exhaust passage extending from the combustion chamber 4, and a tapered surface 8 a with which the face portion 16 of the valve 10 abuts the opening peripheral edge of the exhaust passage 6 to the combustion chamber 4.
  • An annular valve seat 8 is provided.
  • Reference numeral 3 denotes a valve insertion hole provided in the cylinder head 2, and an inner peripheral surface of the valve insertion hole 3 is constituted by a valve guide 3 a with which the shaft portion 12 of the valve 10 is slidably contacted.
  • Reference numeral 9 is a valve spring for urging the valve 10 in the valve closing direction (upward in FIG. 1)
  • reference numeral 12c is a cotter groove provided at the end of the valve shaft.
  • the shell 11 and the cap 18 that are exposed to the high temperature gas in the combustion chamber 4 and the exhaust passage 6 are made of heat-resistant alloy steel.
  • the shaft end member 12b that does not require heat resistance as much as the cap 18 is made of a general steel material.
  • the hollow portion S in the valve 10 includes a truncated cone-shaped large-diameter hollow portion S1 provided in the valve umbrella portion 14 and a linear (rod-shaped) small-diameter hollow portion S2 provided in the valve shaft portion 12. Are communicated so as to be orthogonal to each other via a columnar medium-diameter hollow portion S3 provided at a position corresponding to the fillet portion 13.
  • annular ceiling surface of the large-diameter hollow portion S1 (a bottom surface of the concave portion 14b of the umbrella outer shell 14a that is the opening peripheral portion of the medium-diameter hollow portion S3) 14b1, and a medium-diameter hollow portion that is the opening peripheral portion of the small-diameter hollow portion S1
  • the annular ceiling surface 20 of S ⁇ b> 3 is configured by a plane that is orthogonal to the central axis L of the bulb 10.
  • the communicating portion P1 of the large-diameter hollow portion S1 with the medium-diameter hollow portion S3 is replaced with a smooth shape as in the prior art documents 1 and 2, and a bowl-shaped annular step as viewed from the large-diameter hollow portion S1 side.
  • a portion 15 is formed, and a side (a ceiling surface of the large-diameter hollow portion S1) 14b1 facing the large-diameter hollow portion S1 of the annular step portion 15 is configured by a plane orthogonal to the central axis L of the bulb 10. .
  • the communicating portion P2 of the medium-diameter hollow portion S3 with the small-diameter hollow portion S2 is replaced with a smooth shape as in the prior patent documents 1 and 2, and has a bowl-like shape when viewed from the large-diameter hollow portion S1 side.
  • a step portion 15 a is formed, and the ceiling surface 20 in the medium-diameter hollow portion S ⁇ b> 3 (opening peripheral edge portion of the small-diameter hollow portion S ⁇ b> 2 in the medium-diameter hollow portion S ⁇ b> 3) 20 is also configured by a plane orthogonal to the central axis L of the valve 10. ing.
  • the small-diameter hollow portion S2 includes a small-diameter hollow portion S21 having a relatively large inner diameter near the valve shaft end portion and a small-diameter hollow portion S22 having a relatively small inner diameter near the valve umbrella portion 14.
  • the annular stepped portion 17 is formed between the small-diameter hollow portion S21 and the small-diameter hollow portion S22, and the coolant 19 is loaded up to a position beyond the stepped portion 17.
  • the coolant (liquid) 19 in the large-diameter hollow portion S1 and the medium-diameter hollow portion S3 has a longitudinal circulation flow (convection) T1 as shown in FIG. , T2 are formed, and at the same time, as shown in FIGS. 3A and 3B, turbulent flows F9a and F9b are formed in the coolant (liquid) 19 in the small-diameter hollow portion S2.
  • the lower layer portion, the middle layer portion, and the upper layer portion of the coolant 19 in the hollow portion S are positively stirred, so that the heat drawing effect (thermal conductivity) in the valve 10 is greatly improved.
  • the valve 10 is driven (reciprocating in the axial direction) by a cam (not shown) that rotates in synchronization with the crankshaft. Therefore, as shown in FIGS. 2A and 2B, inertial forces Wa and Wb act on the coolant 19 in the hollow portion S of the valve 10, and particularly when the valve 10 is seated.
  • the first circulation flow (convection) T1 and the second circulation flow (convection) T2 are formed in the hollow portion S by being strongly influenced by the inertial force Wa (see FIGS. 2 and 4). The inside of S is actively stirred.
  • the coolant in the hollow portion S has an upward inertial force Wa as shown in FIG.
  • an upward flow F1 is generated.
  • the ceiling surface of the large-diameter hollow portion S1 (opening peripheral edge portion of the medium-diameter hollow portion S3 in the large-diameter hollow portion S) 14b1 and the ceiling surface of the medium-diameter hollow portion S3 (opening of the small-diameter hollow portion S2 in the medium-diameter hollow portion S3) (Peripheral part) 20 is constituted by a plane perpendicular to the central axis L of the valve, so that the communication parts P1, P2 between the hollow parts S1, S2, S3 are formed in a smooth shape.
  • the coolant 19 cannot move upward smoothly.
  • the coolant 19 in the large-diameter hollow portion S1 includes the center (radially inner side) of the communicating portion P1 along the annular stepped portion 15 (the ceiling surface 14b1 of the large-diameter hollow portion S1) from the tapered outer peripheral surface 14b2.
  • the coolant 19 in the medium-diameter hollow portion S3 is radially directed from the cylindrical outer peripheral surface along the annular stepped portion 15a (the ceiling surface 20 of the medium-diameter hollow portion S3).
  • An inward flow F5 is generated.
  • valve 10 is switched from the valve opening operation to the valve closing operation (the valve 10 changes from lowering to rising) and is further seated, as shown in FIG. Since the downward inertia force Wb acts, the coolant 19 flows downward, and further a flow F3 is generated radially outward along the bottom surface in the large-diameter hollow portion S1.
  • the coolant 19 in the large-diameter hollow portion S1 has a flow inward in the longitudinal direction around the central axis L of the valve where the flows F2 and F3 are synthesized.
  • a longitudinal circulation flow (convection) T2 in which the flows F5 and F3 are combined is formed in the coolant 19 in the medium-diameter hollow portion S3.
  • the coolant 19 in the large-diameter hollow portion S1 has a circulating flow (convection) T1 in the longitudinal direction around the central axis L of the valve.
  • a longitudinal circulation flow (convection) T2 is formed in the coolant 19 in the medium diameter hollow portion S3, and further, turbulent flows F9a and F9b are formed in the vicinity of the stepped portion 17 of the small diameter hollow portion S2.
  • the annular ceiling surface (the upper surface of the truncated cone) 14b1 and the outer peripheral surface (the outer circumferential surface of the truncated cone) 14b2 of the large-diameter hollow portion S1 form an obtuse angle. Furthermore, the flow of the coolant 19 (F2 in FIG. 3 (a)) from the radially outer side of the large-diameter hollow portion S1 toward the communication portion P1 along the ceiling surface of the large-diameter hollow portion S1 becomes smooth.
  • the medium-diameter hollow portion S3 is located at a position corresponding to the fillet portion 13 between the umbrella portion 14 and the shaft portion 12, which is a portion most exposed to high-temperature exhaust gas when used as an exhaust valve.
  • FIG. 5 shows the temperature distribution characteristics in the axial direction of the surface temperature of the hollow poppet valve 10 of the present embodiment, the hollow valve B in which the coolant is loaded in the hollow portion formed in the shaft portion, the hollow formed from the shaft portion to the umbrella portion.
  • the temperature distribution characteristic of the valve 10 of this embodiment is estimated to be as shown by a one-point difference line in comparison with the temperature distribution characteristics of each of the peripheral portions (configured with a plane perpendicular to the central axis of the valve).
  • the In FIG. 5, the shape (outer shape) of the hollow poppet valve 10 is indicated by hatching.
  • the entire coolant in the hollow portion is agitated by the circulating flow formed in the large-diameter hollow portion, so that the valve surface temperature including the maximum temperature Tmax is Compared to the maximum temperature (Tmax) position of the valves B and C, the maximum temperature (Tmax) position is closer to the valve umbrella than the valve B and C. It can be seen that the heat drawing effect (heat dissipation) is superior to C.
  • the whole coolant 19 in the hollow part S is more active by the circulation flow T1 formed in the large diameter hollow part S1, and the circulation flow T2 formed in the medium diameter hollow part S3.
  • the maximum temperature (Tmax) position is closer to the umbrella side as shown in FIG. Presumed to be gentle.
  • the stepped portion 17 in the small-diameter hollow portion S2 is provided at a position substantially corresponding to the end portion 3b facing the exhaust passage 6 of the valve guide 3a, and has a shaft end portion having a large inner diameter.
  • the stepped portion 17 in the small-diameter hollow portion S has a predetermined position (in the valve shaft portion 12) that does not enter the exhaust passage 6 when the valve 10 is fully opened (lowered).
  • a thin-walled small-diameter hollow portion S21 forming wall is provided at a predetermined position that is not easily affected by heat in the exhaust passage 6.
  • Reference numeral 17X in FIG. 1 indicates the position of the stepped portion 17 in a state where the valve 10 is fully opened (lowered).
  • the region near the valve umbrella portion 14 in the valve shaft portion 12 that is always in the exhaust passage 6 and exposed to high heat reduces the fatigue strength. It must be formed to a thickness that can withstand.
  • heat from the combustion chamber 4 and the exhaust passage 6 is transmitted via the coolant 19.
  • the transmitted heat is immediately radiated to the cylinder head 2 through the valve guide 3a, the temperature does not become as high as that near the valve umbrella portion 14.
  • the fatigue strength does not decrease in the region near the shaft end in the valve shaft portion 12 than in the region near the valve umbrella portion 14, the strength is improved even if it is formed thin (the inner diameter of the small-diameter hollow portion S 21 is increased). There is no problem in the target (durability such as breakage due to fatigue).
  • the position of the stepped portion 17 is a position substantially corresponding to the lower end portion 3b of the valve guide 3 that is as low as possible and does not enter the exhaust passage 6 when the valve 10 is fully opened (lowered).
  • the inner diameter of the small-diameter hollow portion S21 is increased, and first, the surface area (contact area with the coolant 19) of the entire small-diameter hollow portion S2 is increased, so that the heat transfer efficiency in the valve shaft portion 12 is increased. Has been enhanced.
  • the total weight of the valve 10 is reduced by increasing the volume of the entire small-diameter hollow portion S21.
  • a shell 11 in which an umbrella outer shell 14a provided with a truncated cone-shaped concave portion 14b and a shaft portion 12a are integrally formed is formed by a hot forging process.
  • the bottom surface 14b1 of the concave portion 14b of the umbrella outer shell 14a is formed by a plane orthogonal to the shaft portion 12 (the central axis L of the shell 11).
  • the hot forging process is extrusion forging in which the dies are sequentially replaced, extrusion forging in which the shell 11 is manufactured from a heat-resistant alloy steel metal block, or a spherical portion is installed at the end of the heat-resistant alloy steel rod with an upsetter.
  • any of upsetting forging may be used in which the shell 11 (the umbrella outer shell 14a) is forged using a mold.
  • an R-shaped fillet portion 13 is formed between the umbrella outer shell 14a and the shaft portion 12a of the shell 11, and a tapered face portion is formed on the outer peripheral surface of the umbrella outer shell 14a. 16 is formed.
  • the shell 11 is arranged so that the concave portion 14b of the umbrella outer shell 14a faces upward, and the shaft portion 12 extends from the bottom surface 14b1 of the concave portion 14b of the umbrella outer shell 14a.
  • the hole 14e corresponding to the small-diameter hollow portion S22 is drilled by drilling (first hole drilling step).
  • a hole 14e ′ corresponding to the medium-diameter hollow portion S3 is drilled from the bottom surface 14b1 of the concave portion 14b of the umbrella outer shell 14a (second hole drilling step). ).
  • bowl-shaped annular step portions 15 and 15a are formed in the communication portion between the recess 14b and the hole 14e ′ and the communication portion between the hole 14e ′ and the hole 14e as viewed from the recess 14b side. .
  • a hole 14f corresponding to the small-diameter hollow portion S21 is drilled from the shaft end side of the shell 11 (third hole drilling step).
  • the shaft end member 12b is axially contacted with the shaft end portion of the shell 11 (shaft end member axial contact step).
  • a predetermined amount of coolant (solid) 19 is inserted into the hole 14 e of the recess 14 b of the umbrella outer shell 14 a of the shell 11 (coolant loading step).
  • a cap 18 is welded (for example, resistance welding) to the opening 14c of the recess 14b of the umbrella outer shell 14a of the shell 11 under an argon gas atmosphere, and the valve 10
  • the hollow portion S is sealed (hollow portion sealing step).
  • the welding of the cap 18 may employ electron beam welding, laser welding, or the like instead of resistance welding.
  • FIG. 7 shows a hollow poppet valve according to a second embodiment of the present invention.
  • the shaft end member 12b is axially contacted with the shaft portion 12a of the shaft-integrated shell 11 which is a valve intermediate product, whereby the shaft portion 12 of the valve 10 is configured.
  • the shaft portion 12 of the valve 10A is integrally configured in advance with the umbrella portion 14 (umbrella portion outer shell 14a).
  • the ceiling surface of the medium-diameter hollow portion S3 (opening peripheral edge portion of the small-diameter hollow portion S2 in the medium-diameter hollow portion S3) 20 is configured by a plane orthogonal to the central axis L of the valve 10.
  • the ceiling surface of the medium-diameter hollow portion S3 ′ (the opening peripheral edge of the small-diameter hollow portion S2 ′ in the medium-diameter hollow portion S3 ′) 20a and a predetermined angle with respect to the central axis L
  • the tapered surface is inclined at 60 to 90 degrees (tapered at 30 to 0 degrees with respect to a plane perpendicular to the central axis L).
  • the inner diameter of the small-diameter hollow portion S21 near the valve shaft end is formed larger than the inner diameter of the small-diameter hollow portion S22 near the valve umbrella portion 14, so that the inside of the small-diameter hollow portion S2
  • the second annular stepped portion 17 is provided at a predetermined position in the axial direction, and the coolant 19 is loaded up to a position beyond the second stepped portion 17.
  • the inside diameter of the small-diameter hollow portion S2 ′ is formed to have a constant size in the axial direction.

Abstract

La présente invention concerne une soupape champignon creuse ayant une meilleure conductivité thermique. Une soupape champignon creuse (10) présente une section parapluie (14) formée d'un seul tenant à une extrémité de tige de la soupape. Une section creuse (S) est formée dans la soupape de façon à s'étendre de la section parapluie (14) à une section arbre (12) et est remplie d'un matériau de refroidissement (19). Une section creuse de petit diamètre rectiligne (S2) à l'intérieur de la section arbre (12) communique avec une section creuse de grand diamètre en forme de cône tronqué circulaire (S1) à travers une section creuse de diamètre moyen (S3) prévue à un emplacement correspondant à une section filet (13), la section creuse de grand diamètre (S1) étant située à l'intérieur de la section parapluie (14). Le bord périphérique d'ouverture (14b1) de la section creuse de diamètre moyen (S3), le bord périphérique d'ouverture (14b1) faisant face à la section creuse de grand diamètre (S1), et le bord périphérique d'ouverture (20) de la section creuse de petit diamètre (S2), le bord périphérique d'ouverture (20) faisant face à la section creuse de diamètre moyen (S3), sont respectivement constitués de plans perpendiculaires à l'axe central (L) de la soupape. Lorsque la soupape (10) effectue un mouvement de va-et-vient axial, un flux de circulation verticalement vers l'intérieur (T1) est formé dans la section creuse (S1), et un flux de circulation vertical (T2) est formé dans la section creuse (S3). Par conséquent, le matériau de refroidissement (19) est positivement agité pour améliorer la conductivité thermique de la soupape (10).
PCT/JP2014/062374 2014-05-08 2014-05-08 Soupape champignon creuse WO2015170384A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/062374 WO2015170384A1 (fr) 2014-05-08 2014-05-08 Soupape champignon creuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/062374 WO2015170384A1 (fr) 2014-05-08 2014-05-08 Soupape champignon creuse

Publications (1)

Publication Number Publication Date
WO2015170384A1 true WO2015170384A1 (fr) 2015-11-12

Family

ID=54392253

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/062374 WO2015170384A1 (fr) 2014-05-08 2014-05-08 Soupape champignon creuse

Country Status (1)

Country Link
WO (1) WO2015170384A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190138894A (ko) * 2018-03-20 2019-12-16 니탄 밸브 가부시키가이샤 배기용 중공 포핏 밸브
CN112752895A (zh) * 2018-11-12 2021-05-04 日锻汽门株式会社 发动机的提升阀的制造方法
US11850690B2 (en) 2020-03-30 2023-12-26 Nittan Corporation Method for manufacturing engine poppet valve

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2547383Y2 (ja) * 1990-11-19 1997-09-10 フジオーゼックス株式会社 内燃機関用中空弁
WO2014054613A1 (fr) * 2012-10-02 2014-04-10 日鍛バルブ株式会社 Soupape à tige creuse

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2547383Y2 (ja) * 1990-11-19 1997-09-10 フジオーゼックス株式会社 内燃機関用中空弁
WO2014054613A1 (fr) * 2012-10-02 2014-04-10 日鍛バルブ株式会社 Soupape à tige creuse

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190138894A (ko) * 2018-03-20 2019-12-16 니탄 밸브 가부시키가이샤 배기용 중공 포핏 밸브
EP3667036A4 (fr) * 2018-03-20 2020-09-02 Nittan Valve Co., Ltd. Soupape champignon d'échappement creuse
KR102285017B1 (ko) * 2018-03-20 2021-08-04 니탄 밸브 가부시키가이샤 배기용 중공 포핏 밸브
US11300018B2 (en) 2018-03-20 2022-04-12 Nittan Valve Co., Ltd. Hollow exhaust poppet valve
CN112752895A (zh) * 2018-11-12 2021-05-04 日锻汽门株式会社 发动机的提升阀的制造方法
US11536167B2 (en) 2018-11-12 2022-12-27 Nittan Valve Co., Ltd. Method for manufacturing engine poppet valve
CN112752895B (zh) * 2018-11-12 2023-10-13 日锻株式会社 发动机的提升阀的制造方法
US11850690B2 (en) 2020-03-30 2023-12-26 Nittan Corporation Method for manufacturing engine poppet valve

Similar Documents

Publication Publication Date Title
JP5463439B1 (ja) 中空ポペットバルブ
KR101688582B1 (ko) 중공 포핏 밸브
TWI638092B (zh) 中空提動閥及中空提動閥之隔熱效果與導熱效果之相對值的調整方法
JP6033402B2 (ja) 中空ポペットバルブ
WO2015170384A1 (fr) Soupape champignon creuse
JP6251177B2 (ja) 中空ポペットバルブ
JP6029742B2 (ja) 中空ポペットバルブ
JP6063558B2 (ja) 中空ポペットバルブ
JP6131318B2 (ja) 中空ポペットバルブ

Legal Events

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

Ref document number: 14891509

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 14891509

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP