JP2015094235A - Fuel injection valve temperature inhibition mechanism for internal combustion engine and internal combustion engine equipped with this mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel injection valve temperature inhibition mechanism for an internal combustion engine capable of inhibiting temperature increasing at the extremity end of a nozzle part.SOLUTION: This invention comprises at least one heat transfer enhancement member 11 made of material having a higher coefficient of thermal conductivity than that of material forming a cylinder head 6 and showing a ring shape as seen in a plan view; and an annular groove 12 formed to be sunk from an inner circumferential surface of a mounting hole 4 formed at the cylinder head 6 toward a radial outer side and storing the heat transfer enhancement member 11. At the time of operation of an internal combustion engine, the heat transfer enhancement member 11 is formed in such a way that an entire inner circumferential surface 11a is contacted with an outer circumferential surface 2a of a nozzle part 2 and an entire outer circumferential surface 11b is contacted with an inner circumferential surface 12a of the annular groove 12.

Description

  The present invention relates to a fuel injection valve temperature suppression mechanism for an internal combustion engine and an internal combustion engine including the same.

As shown in FIG. 12, in general, the fuel injection valve 1 of an internal combustion engine is positioned so that a nozzle portion 2 at the tip is positioned with a predetermined gap 5 along a mounting hole 4 communicating with a combustion chamber 3 of the internal combustion engine. It is attached to a cylinder head (cylinder cover) 6 of the internal combustion engine. Therefore, when the nozzle part 2 is exposed to the high-temperature combustion gas in the combustion chamber 3, the temperature of the nozzle part 2 rises, and the fuel inside the nozzle part 2 remains, deposits are formed inside the nozzle part 2 and the nozzle holes. 7 causes a problem that the fuel injection amount is reduced.
In order to solve this problem, the inventions described in Patent Documents 1 to 3 below are known.
In addition, the code | symbol 8 in FIG. 12 has shown the cooling water channel | path through which cooling water is flowed.

JP-A-9-310660 Japanese Patent Application Laid-Open No. 9-126089 Japanese Patent No. 4710944

  5, the metal spring seal 14 is attached to the tip of the nozzle portion 8, and the metal spring seal 14 is attached to the inner peripheral surface of the mounting hole of the engine head 15 and the outer peripheral surface of the nozzle portion 8. To prevent the ingress of combustion gas, reduce the area (axial length) of the nozzle portion 8 exposed to the combustion gas, lower the temperature of the tip portion of the nozzle portion 8, and deposit adhesion Is to be suppressed.

  However, in what is described in FIG. 5 of the above-mentioned Patent Document 1, the metal spring seal 14 is exposed to the combustion gas, becomes hot, and is thermally deformed, and the combustion gas may leak to the upper part of the nozzle portion 8. At that time, the side surface portion of the nozzle portion 8 is exposed to the combustion gas, and the temperature of the tip portion of the nozzle portion 8 may increase.

  Moreover, in what was described in FIG. 1, FIG. 7 of the said patent document 2, the annular groove 16 was formed in the front-end | tip part of the nozzle part 12 (fuel injection valve main body), and two metal ring members are formed in this annular groove 16 17A and 17B are installed to prevent the intrusion of combustion gas.

  However, in Patent Document 2, in order to mount the metal ring members 17A and 17B to the nozzle portion 12, it is necessary to provide notches (slits) 17C in the metal ring members 17A and 17B.

  When the metal ring members 17A and 17B are mounted in the annular groove 16, the notches 17C are shifted from each other to maintain the sealing performance. However, the high-temperature and high-pressure combustion gas is not cut from one notch to the other notch. There is a risk of passing through and leaking to the top of the nozzle. In that case, the side part of the nozzle part 12 may be exposed to combustion gas, and the temperature of the front-end | tip part of the nozzle part 12 may rise.

  Therefore, it is described in Patent Document 3 that the combustion gas leaks to the upper part of the nozzle part to prevent the side surface part of the nozzle part from being exposed to the combustion gas and the temperature of the tip part of the nozzle part from rising. There is something that was done.

In the above-mentioned Patent Document 3, the outer peripheral portion 2a of the combustion gas nozzle portion 2 is moved to the rear end side by a heat-resistant annular seal member 12 such as polytetrafluoroethylene and a heat-resistant elastic metal 13 such as stainless steel. The entry of is to be deterred.
However, in the device described in Patent Document 3, the tip surface of the nozzle portion 2 in which the nozzle holes 5 and 6 are formed is still exposed to the combustion gas, and the tip of the nozzle portion 2 is exposed to the combustion gas. The temperature of the part may increase.

  The present invention has been made to solve the above-described problems, and provides a fuel injection valve temperature suppression mechanism for an internal combustion engine that can suppress a temperature rise at the tip of a nozzle portion, and an internal combustion engine including the same. For the purpose.

In order to solve the above problems, the present invention employs the following means.
The fuel injection valve temperature suppression mechanism for an internal combustion engine according to the first aspect of the present invention is such that the cylinder head of the internal combustion engine is positioned so as to maintain a predetermined gap along an attachment hole communicating with the combustion chamber of the internal combustion engine. A fuel injection valve temperature suppression mechanism for an internal combustion engine to which a nozzle portion of a fuel injection valve is attached to at least one heat transfer promoting member having a ring shape in plan view, and an attachment hole formed in the cylinder head. An annular groove that is formed so as to be dug down radially outward from the inner peripheral surface, and that accommodates the heat transfer promotion member, and during operation of the internal combustion engine, the heat transfer promotion member is The entire inner peripheral surface is in contact with the outer peripheral surface of the nozzle portion, and the entire outer peripheral surface and / or the entire periphery of the end surface connected to the outer peripheral surface is in contact with the inner surface of the annular groove. about And features.

  The fuel injection valve temperature suppression mechanism for an internal combustion engine according to the second aspect of the present invention is such that the cylinder head of the internal combustion engine is positioned so as to maintain a predetermined gap along an attachment hole communicating with the combustion chamber of the internal combustion engine. A fuel injection valve temperature suppression mechanism for an internal combustion engine, to which a nozzle portion of a fuel injection valve is attached, having at least one heat transfer promotion member having a ring shape in plan view, and radially inward from an outer peripheral surface of the nozzle portion And an annular groove that accommodates the heat transfer promoting member, and during operation of the internal combustion engine, the heat transfer promoting member is disposed on the entire inner peripheral surface and / or The entire circumference of the end face connected to the inner peripheral surface is in contact with the inner surface of the annular groove, and the entire outer peripheral surface is in contact with the inner peripheral surface of the mounting hole.

  According to the fuel injection valve temperature suppression mechanism of the internal combustion engine according to the first aspect of the present invention and the fuel injection valve temperature suppression mechanism of the internal combustion engine according to the second aspect of the present invention, the cylinder is moved from the nozzle portion by the heat transfer promotion member. Since a heat transport route toward the head can be formed, the heat that has entered the tip of the nozzle portion is quickly transmitted to the cylinder head having a larger heat capacity than the fuel injection valve via the heat transfer promoting member. Temperature rise at the tip of the part can be suppressed.

  In the fuel injection valve temperature suppression mechanism of the internal combustion engine, at least two heat transfer promoting members are stacked in the height direction, and among these heat transfer promoting members, the joint of one heat transfer promoting member and the one It is more preferable that the joint of another heat transfer promotion member disposed adjacent to the heat transfer promotion member is accommodated in the annular groove so as to face in the opposite direction of 180 °.

  According to such a fuel injection valve temperature suppression mechanism for an internal combustion engine, it is possible to reduce the injection of combustion gas from below the heat transfer promotion member to above the heat transfer promotion member, and above the heat transfer promotion member. The heat input from the side part of the nozzle part located can be reduced, and the temperature rise in the front-end | tip part of a nozzle part can further be suppressed.

  In the fuel injection valve temperature suppression mechanism of the internal combustion engine, it is more preferable that the heat transfer promoting member is made of a material having a higher thermal conductivity than a material forming the cylinder head.

  In the fuel injection valve temperature suppression mechanism of the internal combustion engine, it is more preferable that a heat-resistant coating is applied to the entire contact surface of the heat transfer promoting member.

  According to such a fuel injection valve temperature suppression mechanism for an internal combustion engine, heat input from the contact surface to the heat transfer promoting member can be reduced, and heat transfer efficiency from the nozzle portion to the cylinder head can be further improved. it can.

  In the fuel injection valve temperature suppression mechanism of the internal combustion engine, the end of the cooling water passage formed inside the cylinder head is located on the combustion chamber side from the inner surface of the cooling water passage to the nozzle portion side. It is more preferable that an enlarged portion dug down toward is provided.

  According to such a fuel injection valve temperature suppression mechanism for an internal combustion engine, the heat transmitted from the nozzle part to the cylinder head can be efficiently transmitted to the cooling water in the cooling water passage, and the temperature at the tip part of the nozzle part The rise can be further suppressed.

  An internal combustion engine according to the present invention includes any one of the above-described fuel injection valve temperature suppression mechanisms for the internal combustion engine.

  The internal combustion engine according to the present invention includes the fuel injection valve temperature suppression mechanism for the internal combustion engine that can suppress the temperature rise at the tip of the nozzle portion. Can be prevented, the fuel injection amount can be prevented from decreasing, and the reliability of the internal combustion engine can be improved.

  The fuel injection valve temperature suppression mechanism for an internal combustion engine according to the present invention and the internal combustion engine equipped with the same have an effect of suppressing a temperature rise at the tip of the nozzle portion.

It is sectional drawing which expands and shows the principal part of the fuel injection valve temperature suppression mechanism of the internal combustion engine which concerns on 1st Embodiment of this invention. It is a top view of the heat-transfer promotion member shown in FIG. It is sectional drawing which expands and shows the principal part of the fuel injection valve temperature suppression mechanism of the internal combustion engine which concerns on 2nd Embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve temperature suppression mechanism of the internal combustion engine which concerns on 3rd Embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve temperature suppression mechanism of the internal combustion engine which concerns on 4th Embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve temperature suppression mechanism of the internal combustion engine which concerns on 5th Embodiment of this invention. It is a top view of the heat-transfer promotion member shown in FIG. It is sectional drawing which expands and shows the principal part of the fuel injection valve temperature suppression mechanism of the internal combustion engine which concerns on 6th Embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve temperature suppression mechanism of the internal combustion engine which concerns on 7th Embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve temperature suppression mechanism of the internal combustion engine which concerns on 8th Embodiment of this invention. It is sectional drawing which expands and shows the principal part of the fuel injection valve temperature suppression mechanism of the internal combustion engine which concerns on other embodiment of this invention. It is a figure for demonstrating the conventional problem, Comprising: It is sectional drawing which expands and shows a principal part like FIG.

[First Embodiment]
Hereinafter, a fuel injection valve temperature suppression mechanism 10 for an internal combustion engine according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the fuel injection valve temperature suppression mechanism 10 for the internal combustion engine according to the present embodiment includes a heat transfer promotion member 11 and an annular groove 12 that accommodates the heat transfer promotion member 11.

The heat transfer accelerating member 11 is made of a material (for example, gold, silver, copper, aluminum) having a higher thermal conductivity than the material (for example, cast iron) forming the cylinder head 6, and as shown in FIG. It is a member having a ring shape, and an abutment 13 is provided as in the piston ring.
The heat transfer promoting member 11 has an inner diameter such that the entire inner peripheral surface 11 a is in contact with the outer peripheral surface 2 a of the nozzle portion 2 and the entire outer peripheral surface 11 b is in contact with the inner peripheral surface (bottom surface) 12 a of the annular groove 12. Is the same as the outer diameter of the nozzle portion 2, and the outer diameter is the same as the inner diameter of the annular groove 12.
In this embodiment, a right angle joint (straight) is described as a specific example of the joint 13, but the joint 13 of the heat transfer promotion member 11 according to the present embodiment is not limited to a right angle joint. Alternatively, other joints (an oblique joint (angle), a stepped joint (step), etc.) can be employed as the joint 13.

The annular groove 12 is a circumferential groove provided at an end portion of the mounting hole 4 formed in the cylinder head 6 on the combustion chamber 3 side (lower side in FIG. 1), and the inner peripheral surface of the mounting hole 4. It is formed so that it can be dug down radially outward from.
The annular groove 12 has an inner diameter that is the same as the outer diameter of the heat transfer promoting member 11 so that the inner peripheral surface 12a contacts the outer peripheral surface 11b of the heat transfer promoting member 11 and is continuous along the circumferential direction. Is formed.
As shown in FIG. 1, the entire circumference of one end surface (upper surface) 11 c of each of the heat transfer promotion member 11 and the annular groove 12 connected to the outer peripheral surface 11 b of the heat transfer promotion member 11 is one of the annular grooves 12. Heat transfer enhancement so that the entire circumference of the other end surface (lower surface) 11d that is in contact with the end surface (upper surface) 12b and connected to the outer peripheral surface 11b of the heat transfer promoting member 11 is in contact with the other end surface (lower surface) 12c of the annular groove 12 It is more preferable that the height of the member 11 and the height of the annular groove 12 are the same. Alternatively, the contact surface with the annular groove 12 may be any one of the outer peripheral surface 11b, the one end surface 11c, and the other end surface 11d.

  According to the fuel injection valve temperature suppression mechanism 10 for an internal combustion engine according to the present embodiment, a heat transport route from the nozzle portion 2 toward the cylinder head 6 can be formed, so that heat that has entered the tip portion of the nozzle portion 2 can be formed. Is quickly transmitted to the cylinder head 6 having a larger heat capacity than the fuel injection valve 1 through the heat transfer promotion member 11, and the temperature rise at the tip of the nozzle portion 2 can be suppressed.

[Second Embodiment]
A fuel injection valve temperature suppression mechanism 20 according to a second embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 3, the fuel injection valve temperature suppression mechanism 20 of the internal combustion engine according to the present embodiment includes a heat transfer promotion member 21 and an annular groove 22 that accommodates the heat transfer promotion member 21.

The heat transfer promoting member 21 is made of a material (for example, gold, silver, copper, or aluminum) having a higher thermal conductivity than the material (for example, cast iron) forming the cylinder head 6 and has a ring shape in plan view. Yes, as with the piston ring, a joint (not shown) is provided.
Further, the heat transfer promoting member 21 has an inner diameter such that the entire inner peripheral surface 21 a is in contact with the outer peripheral surface (bottom surface) 22 a of the annular groove 22, and the entire outer peripheral surface 21 b is in contact with the inner peripheral surface of the mounting hole 4. The outer diameter of the annular groove 12 is the same, and the outer diameter is the same as the inner diameter of the mounting hole 4.
In addition, as a joint, a right angle joint (straight) and other joints (an oblique joint (angle), a stepped joint (step), etc.) are employ | adopted.

The annular groove 22 is a circumferential groove provided at an end portion of the nozzle portion 2 located on the combustion chamber 3 side (lower side in FIG. 3), and is directed radially inward from the outer peripheral surface 2 a of the nozzle portion 2. It is formed so that it can be dug down.
The annular groove 22 has an outer diameter that is the same as the inner diameter of the heat transfer promoting member 21 so that the outer peripheral surface 22a is in contact with the inner peripheral surface 21a of the heat transfer promoting member 21 and is continuous along the circumferential direction. Is formed.
As shown in FIG. 3, each of the heat transfer promotion member 21 and the annular groove 22 has one end surface (upper surface) 21 c connected to the inner peripheral surface 21 a of the heat transfer promotion member 21, and one end surface of the annular groove 22 ( (Upper surface) 22b is in contact with the entire circumference of the heat transfer promoting member 21, and the other end surface (lower surface) 21d connected to the inner peripheral surface 21a of the heat transfer promoting member 21 is in contact with the entire circumference of the other end surface (lower surface) 22c of the annular groove 22. More preferably, the heat promoting member 21 and the annular groove 22 are formed to have the same height. Alternatively, the contact surface with the annular groove 22 may be any of the inner peripheral surface 21a, the one end surface 22b, and the other end surface 22c.

  According to the fuel injection valve temperature suppression mechanism 20 of the internal combustion engine according to the present embodiment, a heat transport route from the nozzle portion 2 toward the cylinder head 6 can be formed, so that the heat that has entered the tip portion of the nozzle portion 2 can be formed. Is quickly transmitted to the cylinder head 6 having a larger heat capacity than the fuel injection valve 1 via the heat transfer promoting member 21, and the temperature rise at the tip of the nozzle portion 2 can be suppressed.

[Third Embodiment]
A fuel injection valve temperature suppression mechanism 30 for an internal combustion engine according to a third embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 4, the fuel injection valve temperature suppression mechanism 30 of the internal combustion engine according to the present embodiment includes a heat transfer promotion member 31 and an annular groove 32 that accommodates the heat transfer promotion member 31.

The heat transfer promotion member 31 is made of a material (for example, gold, silver, copper, aluminum) having a higher thermal conductivity than the material (for example, cast iron) forming the cylinder head 6 and has a sleeve shape that has a ring shape in plan view. As with the piston ring, a joint (not shown) is provided.
The heat transfer promoting member 31 has an inner diameter such that the entire inner peripheral surface 31 a is in contact with the outer peripheral surface 2 a of the nozzle portion 2 and the entire outer peripheral surface 31 b is in contact with the inner peripheral surface (bottom surface) 32 a of the annular groove 32. Is the same as the outer diameter of the nozzle portion 2, and the outer diameter is the same as the inner diameter of the annular groove 32.
In addition, as a joint, a right angle joint (straight) and other joints (an oblique joint (angle), a stepped joint (step), etc.) are employ | adopted.

The annular groove 32 is a circumferential groove provided at an end portion of the mounting hole 4 formed in the cylinder head 6 on the combustion chamber 3 side (lower side in FIG. 4), and the inner peripheral surface of the mounting hole 4. It is formed so that it can be dug down radially outward from.
The annular groove 32 has an inner diameter that is the same as the outer diameter of the heat transfer promoting member 31 so that the inner peripheral surface 32a is in contact with the outer peripheral surface 31b of the heat transfer promoting member 31 and is continuous along the circumferential direction. Is formed.
As shown in FIG. 4, the entire circumference of one end surface (upper surface) 31 c of the heat transfer promotion member 31 and the annular groove 32 connected to the outer peripheral surface 31 b of the heat transfer promotion member 31 is one of the annular grooves 32. Heat transfer enhancement so that the entire circumference of the other end surface (lower surface) 31d in contact with the end surface (upper surface) 32b and connected to the outer peripheral surface 31b of the heat transfer promoting member 31 is in contact with the other end surface (lower surface) 32c of the annular groove 32. It is more preferable that the height of the member 31 and the height of the annular groove 32 are the same. Alternatively, the contact surface with the annular groove 32 may be any one of the outer peripheral surface 31b, the one end surface 31c, and the other end surface 31d.
In the present embodiment, the height of the heat transfer promoting member 31 is twice the height of the heat transfer promoting member 11 described in the first embodiment.

According to the fuel injection valve temperature suppression mechanism 30 of the internal combustion engine according to the present embodiment, a heat transport route from the nozzle portion 2 toward the cylinder head 6 can be formed, so that the heat that has entered the tip portion of the nozzle portion 2 can be formed. Is quickly transmitted to the cylinder head 6 having a larger heat capacity than the fuel injection valve 1 through the heat transfer promotion member 31, and the temperature rise at the tip of the nozzle portion 2 can be suppressed.
Further, according to the fuel injection valve temperature suppression mechanism 30 of the internal combustion engine according to the present embodiment, the height of the heat transfer promotion member 31 is twice the height of the heat transfer promotion member 11 described in the first embodiment. Therefore, the heat transfer efficiency from the nozzle part 2 to the cylinder head 6 can be further improved.

[Fourth Embodiment]
A fuel injection valve temperature suppression mechanism 40 according to a fourth embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 5, the fuel injection valve temperature suppression mechanism 40 of the internal combustion engine according to the present embodiment includes a heat transfer promotion member 41 and an annular groove 42 that houses the heat transfer promotion member 41.

The heat transfer promotion member 41 is made of a material (for example, gold, silver, copper, aluminum) having a higher thermal conductivity than the material (for example, cast iron) forming the cylinder head 6 and has a sleeve shape that exhibits a ring shape in plan view. As with the piston ring, a joint (not shown) is provided.
The heat transfer promoting member 41 has an inner diameter such that the entire inner peripheral surface 41 a is in contact with the outer peripheral surface (bottom surface) 42 a of the annular groove 42 and the entire outer peripheral surface 41 b is in contact with the inner peripheral surface of the mounting hole 4. The outer diameter of the annular groove 42 is the same, and the outer diameter is the same as the inner diameter of the mounting hole 4.
In addition, as a joint, a right angle joint (straight) and other joints (an oblique joint (angle), a stepped joint (step), etc.) are employ | adopted.

The annular groove 42 is a circumferential groove provided at an end portion of the nozzle portion 2 that is located on the combustion chamber 3 side (lower side in FIG. 5), and is directed radially inward from the outer peripheral surface 2 a of the nozzle portion 2. It is formed so that it can be dug down.
The annular groove 42 has an outer diameter that is the same as the inner diameter of the heat transfer promoting member 41 so that the outer peripheral surface 42 a contacts the inner peripheral surface 41 a of the heat transfer promoting member 41 and is continuous along the circumferential direction. Is formed.
As shown in FIG. 5, each of the heat transfer promotion member 41 and the annular groove 42 has one end surface (upper surface) 41 c connected to the inner peripheral surface 41 a of the heat transfer promotion member 41 and one end surface of the annular groove 42 ( (Upper surface) 42b is in contact with the entire circumference of the heat transfer promoting member 41, and the other end surface (lower surface) 41d connected to the inner peripheral surface 41a of the heat transfer promoting member 41 is in contact with the entire circumference of the other end surface (lower surface) 42c of the annular groove 42. It is more preferable that the heat promotion member 41 and the annular groove 42 are formed to have the same height. Alternatively, the contact surface with the annular groove 42 may be any of the inner peripheral surface 41a, the one end surface 41c, and the other end surface 41d.
In the present embodiment, the height of the heat transfer promotion member 41 is twice the height of the heat transfer promotion member 21 described in the second embodiment.

According to the fuel injection valve temperature suppression mechanism 40 of the internal combustion engine according to the present embodiment, a heat transport route from the nozzle portion 2 toward the cylinder head 6 can be formed, so that the heat that has entered the tip portion of the nozzle portion 2 can be formed. Is quickly transmitted to the cylinder head 6 having a larger heat capacity than the fuel injection valve 1 through the heat transfer promotion member 41, and the temperature rise at the tip of the nozzle portion 2 can be suppressed.
Moreover, according to the fuel injection valve temperature suppression mechanism 40 of the internal combustion engine according to the present embodiment, the height of the heat transfer promotion member 41 is twice the height of the heat transfer promotion member 21 described in the second embodiment. Therefore, the heat transfer efficiency from the nozzle part 2 to the cylinder head 6 can be further improved.

[Fifth Embodiment]
A fuel injection valve temperature suppression mechanism 50 for an internal combustion engine according to a fifth embodiment of the present invention will be described with reference to FIGS. 6 and 7.
As shown in FIG. 6, the fuel injection valve temperature suppression mechanism 50 of the internal combustion engine according to the present embodiment includes two heat transfer promotion members 51, and an annular groove 52 that houses these two heat transfer promotion members 51. It is equipped with.

The heat transfer promoting member 51 is made of a material (for example, gold, silver, copper, or aluminum) having a higher thermal conductivity than that of the material (for example, cast iron) forming the cylinder head 6, and as shown in FIG. It is a member having a ring shape, and an abutment 53 is provided as in the piston ring.
The heat transfer promoting member 51 has an inner diameter such that the entire inner peripheral surface 51 a is in contact with the outer peripheral surface 2 a of the nozzle portion 2 and the entire outer peripheral surface 51 b is in contact with the inner peripheral surface (bottom surface) 52 a of the annular groove 52. Is the same as the outer diameter of the nozzle portion 2, and the outer diameter is the same as the inner diameter of the annular groove 52.
In the present embodiment, a right angle joint (straight) is described as a specific example of the joint 53, but the joint 53 of the heat transfer promotion member 51 according to the present embodiment is not limited to the right joint. Alternatively, other joints (an oblique joint (angle), a stepped joint (step), etc.) can be employed as the joint 53.
Moreover, as shown in FIG. 7, among the two heat transfer promotion members 51 stacked in the height direction, the joint 13 of one (upper) heat transfer promotion member 51 and the other (lower) heat transfer promotion. It is more preferable that the abutment 13 of the member 51 is accommodated in the annular groove 52 so as to face the opposite direction of 180 °.

The annular groove 52 is a circumferential groove provided at an end portion of the mounting hole 4 formed in the cylinder head 6 on the combustion chamber 3 side (lower side in FIG. 6), and the inner peripheral surface of the mounting hole 4. It is formed so that it can be dug down radially outward from.
Further, the annular groove 52 has an inner diameter that is the same as the outer diameter of the heat transfer promoting member 51 so that the inner peripheral surface 52a is in contact with the outer peripheral surface 51b of the heat transfer promoting member 51 and is continuous along the circumferential direction. Is formed.
In addition, as shown in FIG. 6, one end surface in which each of the two heat transfer promotion members 51 and the annular groove 52 stacked in the height direction is connected to the outer peripheral surface 51 b of one heat transfer promotion member 51 ( The entire circumference of the upper surface 51 c is in contact with one end surface (upper surface) 52 b of the annular groove 52, and the entire circumference of the other end surface (lower surface) 51 d connected to the outer peripheral surface 51 b of the other heat transfer promoting member 51 is the annular groove 52. It is more preferable that the two heat transfer promoting members 51 stacked in the height direction and the annular groove 52 have the same height so as to be in contact with the other end surface (lower surface) 52c. is there. Alternatively, the contact surface with the annular groove 52 may be any one of the outer peripheral surface 51b, the one end surface 51c, and the other end surface 51d.
Moreover, in this embodiment, the height of each heat-transfer promotion member 51 is made the same height as the heat-transfer promotion member 11 demonstrated in 1st Embodiment.

According to the fuel injection valve temperature suppression mechanism 50 for an internal combustion engine according to the present embodiment, a heat transport route from the nozzle portion 2 toward the cylinder head 6 can be formed. Is quickly transmitted to the cylinder head 6 having a larger heat capacity than the fuel injection valve 1 via the two heat transfer promoting members 51, and the temperature rise at the tip of the nozzle portion 2 can be suppressed.
Further, according to the fuel injection valve temperature suppression mechanism 50 for an internal combustion engine according to the present embodiment, two heat transfer promotion members 51 are stacked in the height direction, and one of the heat transfer promotion members 51 is transferred. The joint 53 of the heat promotion member 51 and the joint 53 of another heat transfer promotion member 51 disposed adjacent to one heat transfer promotion member 51 are oriented in the opposite direction by 180 ° in the annular groove. Since it is accommodated, it is possible to reduce the blowout of the combustion gas from below the heat transfer promotion member 51 to above the heat transfer promotion member 51, and the side surface of the nozzle portion 2 located above the heat transfer promotion member 51. The heat input from the part can be reduced, and the temperature rise at the tip of the nozzle part 2 can be further suppressed.
Furthermore, according to the fuel injection valve temperature suppression mechanism 50 of the internal combustion engine according to the present embodiment, the two heat transfer promotion members 51 are arranged, and the overall heat transfer promotion member 51 has the height of the first embodiment. By the way, since it is set to twice the height of the heat transfer promotion member 11 demonstrated, the heat transfer efficiency from the nozzle part 2 to the cylinder head 6 can further be improved.

[Sixth Embodiment]
A fuel injection valve temperature suppression mechanism 60 according to a sixth embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 8, the fuel injection valve temperature suppression mechanism 60 of the internal combustion engine according to the present embodiment includes two heat transfer promotion members 61 and an annular groove 62 that accommodates these two heat transfer promotion members 61. It is equipped with.

The heat transfer promoting member 61 is a member that is made of a material (for example, gold, silver, copper, and aluminum) having a higher thermal conductivity than the material (for example, cast iron) forming the cylinder head 6 and has a ring shape in plan view. Yes, as with the piston ring, a joint (not shown) is provided.
The heat transfer promoting member 61 has an inner diameter such that the entire inner peripheral surface 61 a is in contact with the outer peripheral surface (bottom surface) 62 a of the annular groove 62 and the entire outer peripheral surface 61 b is in contact with the inner peripheral surface of the mounting hole 4. The outer diameter of the annular groove 62 is the same, and the outer diameter is the same as the inner diameter of the mounting hole 4.
In addition, as a joint, a right angle joint (straight) and other joints (an oblique joint (angle), a stepped joint (step), etc.) are employ | adopted.
Of the two heat transfer promotion members 61 stacked in the height direction, the joint of one (upper) heat transfer promotion member 61 and the joint of the other (lower) heat transfer promotion member 61 are illustrated in FIG. Similarly to the two heat transfer promotion members 51 shown in FIG.

The annular groove 62 is a circumferential groove provided at an end portion of the nozzle portion 2 that is located on the combustion chamber 3 side (lower side in FIG. 8), and is directed radially inward from the outer peripheral surface 2 a of the nozzle portion 2. It is formed so that it can be dug down.
Further, the annular groove 62 has an outer diameter that is the same as the inner diameter of the heat transfer promoting member 61 so that the outer peripheral surface 62a is in contact with the inner peripheral surface 61a of the heat transfer promoting member 61 and is continuous along the circumferential direction. Is formed.
As shown in FIG. 8, each of the heat transfer promotion member 61 and the annular groove 62 stacked in the height direction has one end surface (upper surface) 61 c connected to the inner peripheral surface 61 a of the heat transfer promotion member 61. The other end surface (lower surface) 61 d that is in contact with the entire circumference of one end surface (upper surface) 62 b of the annular groove 62 and connected to the inner peripheral surface 61 a of the heat transfer promoting member 61 is the other end surface (lower surface) 62 c of the annular groove 62. It is more preferable that the two heat transfer promoting members 61 stacked in the height direction and the annular groove 62 are formed so as to have the same height so as to be in contact with the entire circumference. Alternatively, the contact surface with the annular groove 62 may be any of the inner peripheral surface 61a, the one end surface 61c, and the other end surface 61d.
Moreover, in this embodiment, the height of each heat transfer promotion member 61 is the same height as the heat transfer promotion member 21 described in the second embodiment.

According to the fuel injection valve temperature suppression mechanism 60 of the internal combustion engine according to the present embodiment, a heat transport route from the nozzle portion 2 toward the cylinder head 6 can be formed. Is quickly transmitted to the cylinder head 6 having a larger heat capacity than the fuel injection valve 1 through the two heat transfer promoting members 61, and the temperature rise at the tip of the nozzle portion 2 can be suppressed.
Further, according to the fuel injection valve temperature suppression mechanism 60 of the internal combustion engine according to the present embodiment, two heat transfer promotion members 61 are stacked in the height direction, and one of the heat transfer promotion members 61 is transferred. The joint of the heat promotion member 61 and the joint of the other heat transfer promotion member 61 disposed adjacent to the one heat transfer promotion member 61 are accommodated in the annular groove so as to face in the opposite direction of 180 °. Therefore, it is possible to reduce the blow-out of the combustion gas from the lower side of the heat transfer promotion member 61 to the upper side of the heat transfer promotion member 61, and from the side surface portion of the nozzle portion 2 located above the heat transfer promotion member 61. Heat input can be reduced, and temperature rise at the tip of the nozzle portion 2 can be further suppressed.
Furthermore, according to the fuel injection valve temperature suppression mechanism 60 of the internal combustion engine according to the present embodiment, the two heat transfer promotion members 61 are arranged, and the height of the heat transfer promotion member 61 as a whole is that of the second embodiment. By the way, since it is set as twice the height of the heat-transfer promotion member 21 demonstrated, the heat-transfer efficiency from the nozzle part 2 to the cylinder head 6 can further be improved.

[Seventh Embodiment]
A fuel injection valve temperature suppression mechanism 70 for an internal combustion engine according to a seventh embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 9, the fuel injection valve temperature suppression mechanism 70 for the internal combustion engine according to the present embodiment accommodates two heat transfer promotion members 71 and 72 and these two heat transfer promotion members 71 and 72. And an annular groove 73.

The heat transfer promotion members 71 and 72 are made of a material (for example, gold, silver, copper, aluminum) having a higher thermal conductivity than the material (for example, cast iron) forming the cylinder head 6 and have a ring shape in plan view. It is a member, and a joint (not shown) is provided similarly to the piston ring.
Further, the heat transfer promoting members 71 and 72 are such that the entire inner peripheral surfaces 71 a and 72 a are in contact with the outer peripheral surface 2 a of the nozzle portion 2, and the entire outer peripheral surfaces 71 b and 72 b are the inner peripheral surface (bottom surface) of the annular groove 73. The inner diameter is the same as the outer diameter of the nozzle portion 2 and the outer diameter is the same as the inner diameter of the annular groove 73 so as to be in contact with 73a.
In addition, as a joint, a right angle joint (straight) and other joints (an oblique joint (angle), a stepped joint (step), etc.) are employ | adopted.
Of the two heat transfer promotion members 71 and 72 stacked in the height direction, the joint of one (upper) heat transfer promotion member 71 and the joint of the other (lower) heat transfer promotion member 72 are Like the two heat transfer promotion members 51 shown in FIG. 7, it is more preferable that they are accommodated in the annular groove 73 so as to face in the opposite directions of 180 °.

The annular groove 73 is a circumferential groove provided at an end portion of the mounting hole 4 formed in the cylinder head 6 on the combustion chamber 3 side (lower side in FIG. 9). It is formed so that it can be dug down radially outward from.
The annular groove 73 has the same inner diameter as the outer diameter of the heat transfer promotion members 71 and 72 so that the inner peripheral surface 73a is in contact with the outer peripheral surfaces 71b and 72b of the heat transfer promotion members 71 and 72, and in the circumferential direction. It is formed so as to be continuous along.
As shown in FIG. 9, each of the two heat transfer promotion members 71 and 72 and the annular groove 73 stacked in the height direction is connected to the outer peripheral surface 71 b of one heat transfer promotion member 71. The entire circumference of the end surface (upper surface) 71c is in contact with one end surface (upper surface) 73b of the annular groove 73, and the entire circumference of the other end surface (lower surface) 72d connected to the outer peripheral surface 72b of the other heat transfer promotion member 72 is annular. The two heat transfer promotion members 71 and 72 stacked in the height direction and the height of the annular groove 73 are formed so as to be in contact with the other end surface (lower surface) 73c of the groove 73. And more preferably. Alternatively, the contact surface with the annular groove 73 may be any one of the outer peripheral surfaces 71b and 72b, the one end surface 71c, and the other end surface 72d.
In this embodiment, the height of the heat transfer promotion member 71 is the same as that of the heat transfer promotion member 31 described in the third embodiment, and the height of the heat transfer promotion member 72 is the same as that of the first embodiment. The height is the same as the heat transfer promotion member 11 described above.

According to the fuel injection valve temperature suppression mechanism 70 of the internal combustion engine according to the present embodiment, a heat transport route from the nozzle portion 2 toward the cylinder head 6 can be formed, so that the heat that has entered the tip portion of the nozzle portion 2 can be formed. Is transmitted to the cylinder head 6 having a larger heat capacity than the fuel injection valve 1 through the two heat transfer promoting members 71 and 72, and the temperature rise at the tip of the nozzle portion 2 can be suppressed.
Further, according to the fuel injection valve temperature suppression mechanism 70 of the internal combustion engine according to the present embodiment, two heat transfer promotion members 71 and 72 are stacked in the height direction, and among these heat transfer promotion members 71 and 72, An annular groove is formed such that the joint of one heat transfer promotion member 71 and the joint of another heat transfer promotion member 72 arranged adjacent to one heat transfer promotion member 71 face in the opposite direction of 180 °. Since it is housed in the nozzle portion 2, it is possible to reduce the injection of combustion gas from below the heat transfer promotion member 72 to above the heat transfer promotion member 71, and the nozzle portion 2 located above the heat transfer promotion member 71. The heat input from the side surface portion of the nozzle portion 2 can be reduced, and the temperature rise at the tip portion of the nozzle portion 2 can be further suppressed.
Furthermore, according to the fuel injection valve temperature suppression mechanism 70 of the internal combustion engine according to the present embodiment, the two heat transfer promotion members 71 and 72 are arranged, and the overall height of the heat transfer promotion members 71 and 72 is the first. Since the height of the heat transfer promoting member 11 described in the embodiment is three times the height, the heat transfer efficiency from the nozzle portion 2 to the cylinder head 6 can be further improved.

[Eighth Embodiment]
A fuel injection valve temperature suppression mechanism 80 according to an eighth embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 10, the fuel injection valve temperature suppression mechanism 80 of the internal combustion engine according to the present embodiment accommodates two heat transfer promotion members 81 and 82 and these two heat transfer promotion members 81 and 82. And an annular groove 83.

The heat transfer promotion members 81 and 82 are made of a material (for example, gold, silver, copper, and aluminum) having a higher thermal conductivity than the material (for example, cast iron) forming the cylinder head 6 and have a ring shape in plan view. It is a member, and a joint (not shown) is provided similarly to the piston ring.
The heat transfer promotion members 81 and 82 are such that the entire inner peripheral surfaces 81 a and 82 a are in contact with the outer peripheral surface (bottom surface) 83 a of the annular groove 83, and the entire outer peripheral surfaces 81 b and 82 b are the inner peripheral surfaces of the mounting holes 4. The inner diameter is the same as the outer diameter of the annular groove 83, and the outer diameter is the same as the inner diameter of the mounting hole 4.
In addition, as a joint, a right angle joint (straight) and other joints (an oblique joint (angle), a stepped joint (step), etc.) are employ | adopted.
Of the two heat transfer promotion members 81 and 82 stacked in the height direction, the joint of one (upper) heat transfer promotion member 81 and the joint of the other (lower) heat transfer promotion member 82 are Like the two heat transfer promotion members 51 shown in FIG. 7, it is more preferable that they are accommodated in the annular groove 83 so as to face in directions opposite to 180 °.

The annular groove 83 is a circumferential groove provided at an end portion of the nozzle portion 2 that is located on the combustion chamber 3 side (lower side in FIG. 10), and is directed radially inward from the outer peripheral surface 2 a of the nozzle portion 2. It is formed so that it can be dug down.
The annular groove 83 has the same outer diameter as the inner diameter of the heat transfer promotion members 81 and 82 so that the outer peripheral surface 83a is in contact with the inner peripheral surfaces 81a and 82a of the heat transfer promotion members 81 and 82, and in the circumferential direction. It is formed so as to be continuous along.
As shown in FIG. 10, one end surface (upper surface) in which each of the heat transfer promotion members 81 and 82 and the annular groove 83 stacked in the height direction is connected to the inner peripheral surface 81 a of the heat transfer promotion member 81. 81 c is in contact with the entire circumference of one end surface (upper surface) 83 b of the annular groove 83, and the other end surface (lower surface) 82 d connected to the inner peripheral surface 82 a of the heat transfer promoting member 82 is the other end surface (lower surface) of the annular groove 83. It is more preferable that the height of the two heat transfer promotion members 81 and 82 stacked in the height direction and the height of the annular groove 83 are the same so as to contact the entire circumference of 83c. . Alternatively, the contact surface with the annular groove 82 may be any of the inner peripheral surfaces 81a and 82a, the one end surface 83bb, and the other end surface 83c.
Moreover, in this embodiment, the height of the heat transfer promotion member 81 is the same height as the heat transfer promotion member 41 described in the fourth embodiment, and the height of the heat transfer promotion member 72 is the second embodiment. The height is the same as the heat transfer promoting member 21 described above.

According to the fuel injection valve temperature suppression mechanism 80 of the internal combustion engine according to the present embodiment, a heat transport route from the nozzle portion 2 toward the cylinder head 6 can be formed, so that the heat that has entered the tip portion of the nozzle portion 2 can be formed. Is quickly transmitted to the cylinder head 6 having a larger heat capacity than the fuel injection valve 1 through the two heat transfer promoting members 81 and 82, and the temperature rise at the tip of the nozzle portion 2 can be suppressed.
Further, according to the fuel injection valve temperature suppression mechanism 80 of the internal combustion engine according to the present embodiment, two heat transfer promotion members 81 and 82 are stacked in the height direction, and among these heat transfer promotion members 81 and 82, The annular groove is formed such that the joint of one heat transfer promotion member 81 and the joint of another heat transfer promotion member 82 disposed adjacent to one heat transfer promotion member 81 face in the opposite direction of 180 °. Since it is housed in the nozzle portion 2, it is possible to reduce the injection of combustion gas from below the heat transfer promotion member 82 to above the heat transfer promotion member 81, and the nozzle portion 2 located above the heat transfer promotion member 81. The heat input from the side surface portion of the nozzle portion 2 can be reduced, and the temperature rise at the tip portion of the nozzle portion 2 can be further suppressed.
Furthermore, according to the fuel injection valve temperature suppression mechanism 80 of the internal combustion engine according to the present embodiment, the two heat transfer promotion members 81 and 82 are arranged, and the overall height of the heat transfer promotion members 81 and 82 is the first. Since the height of the heat transfer promotion member 21 described in the second embodiment is three times the height, the heat transfer efficiency from the nozzle portion 2 to the cylinder head 6 can be further improved.

In addition, this invention is not limited to embodiment mentioned above, It can also implement by changing and changing suitably as needed.
For example, the heat transfer promoting member may be a material having a thermal conductivity equivalent to or lower than that of the material forming the cylinder head 6. In this case, the effect of suppressing the temperature rise is reduced as compared with each of the above embodiments, but a heat transport route from the nozzle portion 2 to the cylinder head 6 can be formed, so that the temperature can be lowered. .
In the above-described embodiment, the other end surfaces (lower surfaces) of the heat transfer promotion members 11, 21, 31, 41, 72, 82 and the other end surfaces (lower surfaces) of the other (lower) heat transfer promotion members 51, 61, It is more preferable that a heat insulating coating (for example, a ceramic coating) is applied to the entire contact surface.
Thereby, the heat input from the contact surface to these heat transfer promoting members can be reduced, and the heat transfer efficiency from the nozzle portion 2 to the cylinder head 6 can be further improved.

Further, in the above-described embodiment, as shown in FIG. 11, the nozzle portion 2 extends from the inner surface of the cooling water passage 9 to the end portion of the cooling water passage 9 located on the combustion chamber 3 side (lower side in FIG. 11). It is more preferable that an enlarged portion 9a that is dug down (expanded) toward the side is provided.
Thereby, the heat transmitted from the nozzle part 2 to the cylinder head 6 can be efficiently transmitted to the cooling water in the cooling water passage 9, and the temperature rise at the tip part of the nozzle part 2 can be further suppressed. .
FIG. 11 shows an example in which the cooling water passage 9 is applied to the first embodiment described above.

DESCRIPTION OF SYMBOLS 1 Fuel injection valve 2 Nozzle part 3 Combustion chamber 4 Mounting hole 5 Gap 6 Cylinder head 9 Cooling water passage 9a Enlarged part 10 Fuel injection valve temperature control mechanism 11 of internal combustion engine Heat transfer promotion member 12 Annular groove 13 Joint 20 Fuel of internal combustion engine Injection valve temperature suppression mechanism 21 Heat transfer promotion member 22 Annular groove 30 Fuel injection valve temperature suppression mechanism 31 of an internal combustion engine Heat transfer promotion member 32 Annular groove 40 Fuel injection valve temperature suppression mechanism 41 of an internal combustion engine Heat transfer promotion member 42 Annular groove 50 Fuel injection valve temperature suppression mechanism 51 for internal combustion engine Heat transfer promotion member 52 Annular groove 60 Fuel injection valve temperature suppression mechanism 61 for internal combustion engine Heat transfer promotion member 62 Annular groove 70 Fuel injection valve temperature suppression mechanism 71 for internal combustion engine Heat transfer promotion member 72 Heat Transfer Promoting Member 73 Annular Groove 80 Fuel Injection Valve Temperature Suppression Mechanism 81 for Internal Combustion Engine Heat Transfer Promoting Member 82 Heat Transfer Promoting Member 83 Annular Groove

Claims (7)

A fuel injection valve temperature suppression mechanism for an internal combustion engine in which a nozzle portion of the fuel injection valve is attached to a cylinder head of the internal combustion engine so as to be positioned along a mounting hole communicating with the combustion chamber of the internal combustion engine. There,
At least one heat transfer promoting member having a ring shape in plan view;
An annular groove that is formed so as to be dug down radially outward from an inner peripheral surface of the mounting hole formed in the cylinder head, and that accommodates the heat transfer promoting member,
During the operation of the internal combustion engine, the heat transfer promoting member has the entire inner peripheral surface in contact with the outer peripheral surface of the nozzle portion, and the entire outer peripheral surface and / or the entire periphery of the end surface connected to the outer peripheral surface. Is formed so as to be in contact with the inner surface of the annular groove, the fuel injection valve temperature suppression mechanism of the internal combustion engine. A fuel injection valve temperature suppression mechanism for an internal combustion engine in which a nozzle portion of the fuel injection valve is attached to a cylinder head of the internal combustion engine so as to be positioned along a mounting hole communicating with the combustion chamber of the internal combustion engine. There,
At least one heat transfer promoting member having a ring shape in plan view;
An annular groove that is formed so as to be dug down radially outward from the outer peripheral surface of the nozzle part, and that accommodates the heat transfer promoting member,
During the operation of the internal combustion engine, the heat transfer promoting member is configured such that the entire inner peripheral surface and / or the entire periphery of the end surface connected to the inner peripheral surface is in contact with the inner surface of the annular groove and the entire outer peripheral surface. Is formed so as to come into contact with the inner peripheral surface of the mounting hole.   At least two of the heat transfer promoting members are stacked in the height direction, and among these heat transfer promoting members, the joint of one heat transfer promoting member and the one heat transfer promoting member are disposed adjacent to each other. The fuel injection valve temperature of the internal combustion engine according to claim 1 or 2, wherein the joint of another heat transfer promoting member is accommodated in the annular groove so as to face in a direction opposite to 180 °. Suppression mechanism.   The fuel injection valve temperature control for an internal combustion engine according to any one of claims 1 to 3, wherein the heat transfer promoting member is made of a material having a higher thermal conductivity than a material forming the cylinder head. mechanism.   The fuel injection valve temperature suppression mechanism for an internal combustion engine according to any one of claims 1 to 4, wherein a heat-resistant coating is applied to the entire contact surface of the heat transfer promoting member.   An enlarged portion dug down from the inner surface of the cooling water passage toward the nozzle portion is provided at an end portion of the cooling water passage formed inside the cylinder head and located on the combustion chamber side. The fuel injection valve temperature suppression mechanism for an internal combustion engine according to any one of claims 1 to 5, wherein:   An internal combustion engine comprising the internal combustion engine fuel injection valve temperature suppression mechanism according to any one of claims 1 to 6.

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