JP4283208B2 - valve - Google Patents

Description

  The present invention relates to a valve provided in an internal combustion engine such as an automobile engine, a motorcycle engine, or a general-purpose engine.

  There has been proposed a technique in which valves inserted as opening / closing valves in a fuel gas supply line and a combustion gas discharge line in an internal combustion engine have a hollow shape and a coolant is sealed in the hollow portion (see Patent Document 1).

  Specifically, the valve described in Patent Document 1 is welded to the flare portion so as to close a hollow stem member having a shaft portion and a flare portion expanded from the shaft portion, and the hollow portion of the stem member. A lid member and metallic sodium sealed in the hollow portion.

  Such a conventional valve is intended to reduce the weight of the valve itself by making the stem member hollow, and to improve the cooling efficiency of the valve itself by sealing metal sodium as a coolant in the hollow part. There was an inconvenience in this point.

That is, by enclosing metallic sodium in the hollow portion, the temperature rise of the valve during operation of the internal combustion engine can be somewhat suppressed. However, during the operation of the internal combustion engine, the fuel gas supply line side normally has about 450 times. Since it is exposed to a high temperature of about 800 ° C. on the combustion gas discharge line side, it is difficult to suppress the temperature rise to a temperature at which the valve is not thermally deformed only by the action of the metallic sodium. . Therefore, during the operation of the internal combustion engine, the internal pressure of the hollow portion increases as the temperature rises, and the valve may be deformed by the internal pressure.
In particular, as the thickness of the stem member is reduced in order to effectively reduce the weight of the valve, the possibility that the stem member is deformed increases.
Japanese Utility Model Publication No. 5-50008

  The present invention has been made in view of the prior art, and is a valve in which a coolant is accommodated in a hollow stem member, and prevents the leakage of the coolant while the hollow portion is in operation during the operation of the internal combustion engine. An object is to provide a valve that can effectively prevent an increase in internal pressure.

In order to achieve the above object, the present invention provides a stem member having a shaft portion and a flare portion extending from the shaft portion toward one end in the axial direction, and having a hollow portion in which the flare portion is an open end. When the lid member is solid wear flared portion of said stem member, said stem member and said a powdery coolant accommodated in an internal space bounded by the lid member, the fuel gas supply line or fuel in an internal combustion engine A valve inserted as an on-off valve in a gas discharge line is provided.
In the valve according to the present invention, the flare portion has a diameter-expanded portion that is expanded toward the one end side in the axial direction, and extends from the diameter-expanded portion toward the one end side in the axial direction across the inflection point and to the one end side. and a reduced diameter portion you close to the axis of the shaft portion toward the front Kifuta member has a peripheral portion extending from the center portion and the central portion radially outward, the peripheral portion the some of held between the caulked by the enlarged diameter portion and the reduced diameter portion Rutotomoni the peripheral portion is welded to the flared portion, thereby, the inflection point by the thermal expansion that occurs during operation of the internal combustion engine Is moved radially outward with respect to the axis of the shaft portion, and the hollow portion is made outside while preventing the dusty coolant from leaking outside between the stem member and the lid member. It is comprised so that the clearance gap which communicates may arise .

Good Mashiku can form a concave portion on the upper surface facing the hollow portion in the central portion.

  In various aspects, preferably, the stem member is formed of a material having a higher coefficient of thermal expansion than the lid member.

  In various aspects, it is preferable to further include a plug member that is press-fitted into the other end side of the shaft portion, and the other end side of the shaft portion is caulked together with the plug member.

According to the valve of the present invention, the flare is accommodated in the hollow portion having the open end, the powdery coolant is accommodated, and the open end is closed by the lid member that is caulked and connected,
The flared portion, the enlarged diameter portion which is enlarged toward the one end side, close to the axis of the shaft portion toward the rolled beauty and one end to one end of the enlarged diameter portion across the inflection point The lid member has a central part and a peripheral part extending radially outward from the central part, and the peripheral part is caulked by the enlarged diameter part and the reduced diameter part. And a part of the peripheral portion is welded to the flare portion, so that the inflection point is based on the axis of the shaft portion due to thermal expansion that occurs during operation of the internal combustion engine. It is configured to move outward in the radial direction so that a gap is formed between the stem member and the lid member to communicate the hollow portion to the outside while preventing the powdery coolant from leaking outside. because there, lighter by hollow, and the While achieving a reduction in the temperature rise due to Jo coolant to effectively prevent the increase in the internal pressure of the hollow portion in the internal combustion engine operation can be effectively prevented that the valve is plastically deformed.

Hereinafter, preferred embodiments of a valve according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a partial schematic cross-sectional view showing an example of an internal combustion engine 100 (engine) to which the valve 1 according to the present embodiment is applied.

An internal combustion engine 100 shown in FIG. 1 includes a combustion chamber 110 that reciprocally accommodates a cylinder head (not shown), a fuel gas supply line 120 for supplying fuel gas to the combustion chamber 110, and the combustion chamber. And a combustion gas discharge line 130 for discharging the gas after being burned at 110.
The valve 1 according to the present embodiment is provided in each of the lines 120 and 130 so that the fuel gas supply line 120 and the combustion gas discharge line 130 can be controlled to open and close.

In the form shown in FIG. 1, the internal combustion engine 100 has an internal combustion engine body 200.
The internal combustion engine body 200 is formed with the combustion chamber 110, and an intake communication hole 220 and an exhaust communication hole 230 that communicate the combustion chamber 110 with the outside.
The intake communication hole 220 and the exhaust communication hole 230 form part of the fuel gas supply line 120 and the combustion gas discharge line 130, respectively.

In the internal combustion engine body 200, the opening end portion 221 of the intake communication hole 220 that communicates with the combustion chamber 110 can be opened and closed with respect to the combustion chamber 110. A valve 1 is disposed so as to freely reciprocate.
Similarly, in the internal combustion engine body 200, the other end according to the present embodiment is configured so that the open end 231 of the exhaust communication hole 230 leading to the combustion chamber 110 can be opened and closed with respect to the combustion chamber 110. The valve 1 is reciprocally arranged.
That is, the valve 1 according to the present embodiment is provided in the internal combustion engine main body 200 so as to be able to take an open position where the corresponding communication holes 220 and 230 are opened and a blocking position where the communication holes 220 and 230 are blocked. On the other hand, it is arranged so as to be able to reciprocate.

  Further, the internal combustion engine 100 shown in FIG. 1 includes a spring receiving member 150 fixed to the valve 1 according to the present embodiment, and an urging member 160 having one end locked to the spring receiving member 150. , A biasing member 160 that biases the corresponding valve 1 toward the shut-off position (Y direction in FIG. 1), and a cam member 170 that controls the position of the valve 1.

The cam member 170 is rotatable about a rotation shaft 180 extending in a direction orthogonal to the axial direction of the valve 1, and has a predetermined radial length with respect to the rotation shaft 180. 171 and a projecting portion 172 projecting radially outward from the reference portion 171.
The cam member 170 positions the valve 1 in the open position against the urging force of the urging member 160 when the protruding portion 172 is operatively engaged with the valve 1, and When the reference portion 171 is operatively engaged with the valve 1, the valve 1 is configured to be positioned at the blocking position by the urging force of the urging member 160.
Reference numeral 190 in FIG. 1 denotes a lifter that is mounted on the valve 1 so as not to be relatively movable in the axial direction so as to be positioned between the cam member 170 and the head of the valve 1.

FIG. 2 shows a longitudinal sectional view of the valve 1 according to the present embodiment.
As shown in FIG. 2, the valve 1 includes a stem member 10 in which a shaft portion 11 and a flare portion 12 extending from the shaft portion 11 to one end side are integrally formed.
The stem member 10 has a hollow shape having a hollow portion 15 in which the flare portion 12 is an open end.
Such a stem member 10 can be formed, for example, by drawing a plate-like member such as steel, heat-resistant steel, stainless steel, and titanium alloy.

Further, the valve 1 has a lid member 20 connected to the stem member 10 by caulking so as to close the hollow portion 15 of the stem member 10.
As shown in FIG. 2, in the present embodiment, the lid member 20 is formed using a flat plate member such as steel, heat-resistant steel, stainless steel, and titanium alloy.
Specifically, the lid member 20 has a central portion whose upper surface faces the hollow portion, and a peripheral edge portion extending radially outward from the central portion with respect to the axis X of the shaft portion 10. The peripheral portion is connected to the stem member 10.
In the form shown in FIG. 2, the central portion is a flat plate shape that is substantially orthogonal to the axis X, but may be a convex shape or a concave shape in a longitudinal sectional view.
Further, reference numeral 90 in FIG. 2 is a plug inserted into the shaft portion 10 in order to close the end portion of the hollow portion 15 opposite to the open end, and the plug 90 is connected to the shaft portion 10. The caulking process is performed in a state of being inserted into the hollow portion 15.

Further, the valve 1 includes a powdery coolant 30 stored in an internal space 15 defined by the stem member 10 and the lid member 20.
That is, the valve 1 is formed by connecting the lid member 20 to the stem member 10 by caulking in a state where the powdery coolant 30 is previously accommodated in the hollow portion 15 of the stem member 10. .
As such a powdery coolant 30, for example, an aluminum nitride or ceramic granular material having an average particle diameter of 1 μm or more can be used.

Further, the valve 1 according to the present embodiment has the following configuration in addition to the above configuration.
That is, as shown in FIG. 2, in a state after the peripheral edge portion of the lid member 20 is connected to the stem member 10 by caulking, the flare portion 12 of the stem member 10 changes the axis X of the shaft portion 11. A diameter-enlarged portion 12a that is enlarged toward one end side (that is, the opening end side of the hollow portion 15) as a reference, and a diameter-reduced portion that extends from the enlarged-diameter portion 12a to one end side with the inflection point 12b interposed therebetween 12c.

Specifically, the reduced diameter portion 12c is configured to intersect the enlarged diameter portion 12a in a longitudinal sectional view.
That is, as shown in FIG. 2, the enlarged diameter portion 12a and the reduced diameter portion 12c are substantially parallel to each other in the longitudinal sectional view outline of the enlarged diameter portion 12a and the longitudinal sectional view outline of the reduced diameter portion 12c. The lid member 20 is sandwiched between the enlarged diameter portion 12a and the reduced diameter portion 12c having such a configuration.

  The valve 1 having such a structure is light in weight by making the stem member 10 hollow, and is effective in increasing the temperature by housing the powdery coolant 30 in the hollow portion 15 of the stem member 10. In addition to suppressing the increase in pressure, it is possible to effectively prevent an increase in pressure in the hollow portion 15 during operation of the internal combustion engine.

That is, since the valve 1 is disposed so as to face the combustion chamber 110, the valve 1 is normally about 450 ° C. in the fuel gas supply line 120 and the combustion gas discharge line during operation of the internal combustion engine. 130 is exposed to a high temperature of about 800 ° C.
Therefore, even if the temperature rise of the stem member 10 is somewhat mitigated by the coolant accommodated in the hollow portion 15 of the stem member 10, the stem member 10 expands and deforms due to the increase of the internal pressure of the hollow portion 15. There is a fear.
In particular, when the thickness of the stem member 10 is reduced in order to reduce the weight of the stem member 10, the risk increases.

In this regard, in the valve 1 according to the present embodiment, the lid member 20 is connected to the flare portion 12 of the stem member 10 by caulking so as to be sandwiched between the enlarged diameter portion 12a and the reduced diameter portion 12c. In addition, the reduced diameter portion 12c is configured to intersect the enlarged diameter portion 12a in a longitudinal sectional view in a state after caulking.
With such a configuration, when the valve 1 is exposed to a high temperature during operation of the internal combustion engine, the inflection point 12b between the enlarged diameter portion 12a and the reduced diameter portion 12c becomes the shaft portion 11. Thermal expansion outward in the radial direction with reference to the axis line X, thereby preventing the powdery coolant 30 to be accommodated between the stem member 10 and the lid member 20 from leaking outside, A gap for communicating the hollow portion 15 to the outside is generated.
Accordingly, it is possible to effectively prevent an increase in the internal pressure of the hollow portion 15 due to a temperature rise, and thus it is possible to prevent the stem member 10 from being deformed.

Furthermore, in the valve 1 according to the present embodiment, the internal pressure of the hollow portion 15 is released by the gap opening in the combustion chamber 110. Accordingly, it is possible to suppress an increase in the internal pressure of the hollow portion 15 while effectively preventing the engine oil from being mixed into the valve 1 and preventing the valve 1 from being damaged.
That is, if an internal pressure relief hole is provided in the vicinity of the other end of the shaft 11 (the end opposite to the flare 12) (A portion in FIG. 1), the engine oil is placed in the hollow portion 15 of the valve 1. There is a risk of inflow.
Further, if the internal pressure relief hole is provided in the portion from the shaft portion 11 to the flare portion 12 (B portion in FIG. 1), the vicinity of the internal pressure relief hole becomes a place of stress concentration, and the stem member 10 may be damaged. is there.
On the other hand, in the valve 1 according to the present embodiment, the gap generated between the stem member 10 and the lid member 20 is used as the internal pressure relief hole. That is, in the valve 1 according to the present embodiment, the internal pressure relief hole is located in the combustion chamber 110. Accordingly, it is possible to suppress an increase in the internal pressure of the hollow portion 15 while effectively preventing the engine oil from being mixed into the valve 1 and preventing the valve 1 from being damaged.

As in the present embodiment, when the lid member 20 is disposed so as to be substantially orthogonal to the shaft portion 11 of the stem member 10, it is preferable that the reduced diameter portion 12c in a longitudinal sectional view. Can be configured to approach the axis X of the shaft portion 11 as it goes to one end side (free end side).
By providing such a configuration, the inflection point 12b is likely to expand radially outward with respect to the axis X of the shaft portion 11 when the stem member 10 is thermally expanded, thereby further reducing the gap. You can definitely get it.

Preferably, the stem member 10 can be formed of a material having a larger coefficient of thermal expansion than the lid member 20.
For example, the stem member 10 is formed of SUS305 (linear thermal expansion coefficient 16 × 10 ⁻⁶ / ° C. at a temperature range of 0 ° C. to 100 ° C.), and the lid member 20 is SUH 3 (at a temperature range of 0 ° C. to 100 ° C.). Linear thermal expansion coefficient 11 × 10 ⁻⁶ / ° C.).
Thus, by forming the stem member 10 from a material that is more easily thermally expanded than the lid member 20, the gap is surely provided between the stem member 10 and the lid member 20 during operation of the internal combustion engine. Can be formed.

In the present embodiment, the lid member 20 has a simple flat plate shape. Instead, the lid member 20 includes a lid member 20 ′ having a concave portion 21a that opens into the hollow portion 15 of the stem member 10. Is also possible (see FIGS. 3 to 5).
As shown in FIG. 3, provision of a concave portion on the upper surface facing the hollow portion 15 in the central portion of the lid member 20 ′ temporarily increases the amount of thermal expansion of the stem member 10, so that the gap is Even if the particle size of the powdery coolant 30 becomes larger, it is possible to effectively prevent the powdery coolant 30 from leaking outside.
Furthermore, in the form shown in FIG. 3, since the concave portion is formed by bending the peripheral portion of the lid member 20 ′ upward, the contact area with the stem member 11 can be increased, This can also effectively prevent the powdery coolant 30 from leaking out.
Moreover, as shown in FIGS. 4 and 5, the cover member 20 ′ is a thick cover member 20 ′ having a recess on the upper surface facing the hollow portion 15 in the center, and the recess is formed into the concave shape. It can also be used as a part. When such a thick lid member 20 ′ is used, the amount of caulking of the stem member 11 can be increased (see FIG. 4). Accordingly, it is possible to prevent leakage of the powdery coolant 30 by increasing the contact area between the lid member 20 ′ and the stem member 11.

  In the present embodiment, the lid member 20 is configured to be connected to the flare portion 12 only by caulking. However, the lid member 20 and the flare portion 12 are separated by thermal expansion during operation of the internal combustion engine. It is also possible to weld a part of the peripheral edge portion of the lid member 20 to the flare portion 12 as long as a gap is generated therebetween.

FIG. 1 is a partial schematic cross-sectional view showing an example of an internal combustion engine (engine) to which a valve according to an embodiment of the present invention is applied. FIG. 2 is a longitudinal sectional view of the valve shown in FIG. FIG. 3 is a longitudinal sectional view showing a modification of the valve according to the present invention. FIG. 4 is a longitudinal sectional view showing another modification of the valve according to the present invention. FIG. 5 is a longitudinal sectional view showing still another modification of the valve according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve 10 Stem member 11 Shaft part 12 Flare part 12a Expanded diameter part 12b Inflection point 12c Reduced diameter part 20 Lid member 20 'Lid member 30 Powdery coolant X Shaft axis

Claims (4)

A stem member having a flared portion extending to one side from the shaft portion and the shaft portion, the lid the flared portion and the stem member having a hollow portion that is an open end, which is a solid wear flared portion of the stem member A valve that is inserted into a fuel gas supply line or a fuel gas discharge line in an internal combustion engine as an on-off valve , comprising a member and a powdery coolant stored in an internal space defined by the stem member and the lid member ,
Reduced the flare section, you close to the axis of the shaft portion according to the enlarged diameter portion which is enlarged, go and one end extending to one side from the enlarged diameter portion across the inflection point toward the one end side Having a diameter portion,
Before Kifuta member has a peripheral portion extending from the center portion and the central portion radially outwardly,
Wherein and peripheral portion is a portion of Rutotomoni the periphery held between the caulking by the enlarged diameter portion and the reduced diameter portion is welded to the flared portion, thereby, the thermal expansion that occurs during operation of the internal combustion engine The inflection point moves radially outward with respect to the axis of the shaft portion, and the powdery coolant is prevented from leaking outside between the stem member and the lid member. A valve characterized in that a gap is formed to communicate the hollow portion with the outside . Central portion, the valve according to claim 1, characterized in that the top surface facing the hollow portion is a concave of the lid member. The valve according to claim 1 or 2 , wherein the stem member is made of a material having a higher coefficient of thermal expansion than the lid member. A plug member press-fitted into the other end of the shaft portion;
Valve according to any one of claims 1 to 3, the other end of said shank, characterized by being caulked processed together with the plug member.

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