JP2006037776A - Internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress knocking and promote warming up by a simple structure in an internal combustion engine. <P>SOLUTION: An intake port 19 and an exhaust port 20 communicating to a combustion chamber 18 are provided, an intake valve 21 and an exhaust valve 2 can open and close the intake port 19 and the exhaust port 20, and an injector injecting fuel to the intake port 19 is provided. A heat pipe 41 is provided performing heat exchange between the combustion chamber 18 and reaching part of fuel spray in the intake port 19. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an internal combustion engine in which an intake port and an exhaust port are provided for a combustion chamber, and a water jacket for circulating cooling water is provided.

  In general internal combustion engines, an intake port for sucking an air-fuel mixture is provided above a combustion chamber, and an exhaust port for discharging combustion gas is provided for communication. The intake port and the exhaust port are connected to an intake valve. In addition, an injector that injects fuel into the intake port is provided, and an ignition plug that ignites the air-fuel mixture in the combustion chamber is provided. Therefore, after the fuel is injected from the injector into the intake port and mixed with air, the air-fuel mixture in the intake port is sucked into the combustion chamber when the intake valve is opened in the piston intake stroke, and the air-fuel mixture is compressed during the compression stroke. The spark is ignited and explodes, and when the exhaust valve is opened in the exhaust stroke, the exhaust gas is discharged to the outside from the exhaust port.

  However, when the internal combustion engine is cold started, since the intake port is in a low temperature state, the fuel spray injected from the injector is not sufficiently atomized and adheres to the wall surface of the intake port. Then, the fuel is not properly mixed with air and is supplied to the combustion chamber in a liquid state, resulting in a decrease in output due to deterioration in combustion and deterioration in exhaust gas characteristics.

  Therefore, for example, in the “fuel vaporization auxiliary heater for an internal combustion engine” described in Patent Document 1 below, an intake guide cylinder is provided downstream of the fuel supply section in the intake pipe, and a heater is provided in the intake guide cylinder. The fuel flowing through the intake pipe is heated to promote atomization and vaporization.

Japanese Examined Patent Publication No. Sho 62-025867

  However, in the above-described “fuel vaporization auxiliary heater of the internal combustion engine” of Patent Document 1, the intake pipe must be modified to include an intake guide cylinder and a heater, and a lead wire for supplying power to the heater. There is a problem that not only the structure becomes complicated, but also the manufacturing cost increases. On the other hand, when the intake port (intake pipe) is heated using a heater, this heat may affect the temperature of the combustion chamber. Generally, cooling the intake port side in the combustion chamber is thought to prevent self-ignition and suppressing knocking. By providing a heater in the vicinity of the intake port and fuel chamber, knocking is prevented. There is a possibility of triggering.

  An object of the present invention is to solve such a problem, and an object of the present invention is to provide an internal combustion engine capable of suppressing knocking and promoting warm-up with a simple configuration.

  In order to solve the above-described problems and achieve the object, an internal combustion engine of the present invention includes a combustion chamber, an intake port and an exhaust port communicating with the combustion chamber, and an intake valve that opens and closes the intake port and the exhaust port. And an exhaust valve, fuel injection means for injecting fuel into the intake port, and a heat conductor for exchanging heat between the combustion chamber and the intake port.

  In the internal combustion engine of the present invention, one end portion of the heat conductor is located in the vicinity of the wall surface of the intake port to which the fuel spray injected from the fuel injection means reaches.

  The internal combustion engine of the present invention also includes a combustion chamber, an intake port and an exhaust port communicating with the combustion chamber, an intake valve and an exhaust valve that open and close the intake port and the exhaust port, and fuel is injected into the intake port. Fuel injection means, a water jacket provided in the vicinity of the intake port, and a heat conductor that exchanges heat between the combustion chamber and the water jacket.

  In the internal combustion engine of the present invention, one end portion of the heat conductor is located in the vicinity of a communication portion with the intake port in the combustion chamber.

  In the internal combustion engine of the present invention, the heat conductor is a heat pipe in which a working fluid is enclosed, and an evaporation portion at one end is located in the vicinity of the combustion chamber, and a condensing portion at the other end is the intake port. Or it is located in the vicinity of the water jacket.

  In the internal combustion engine of the present invention, the heat conductor is a rod-shaped body made of a material having a higher thermal conductivity than the cylinder head.

  In the internal combustion engine of the present invention, a cylinder head is configured by fastening an upper head and a lower head, and the heat conductor is provided by being sealed in a fastening surface between the upper head and the lower head. Yes.

  According to the internal combustion engine of the present invention, the intake port and the exhaust port communicating with the combustion chamber are provided, the intake port and the exhaust port can be opened and closed by the intake valve and the exhaust valve, and the fuel injection for injecting fuel into the intake port Since a heat conductor that exchanges heat between the combustion chamber and the intake port is provided, the heat of the combustion chamber is transmitted to the intake port by the heat conductor, so that in the cold state, Fuel spray and intake air are heated at an early stage to promote vaporization and mixing, and while warming up can be performed efficiently, the combustion chamber is cooled to suppress knocking during warm conditions. Can be simplified.

  Further, according to the internal combustion engine of the present invention, the intake port and the exhaust port communicating with the combustion chamber are provided, the intake port and the exhaust port can be opened and closed by the intake valve and the exhaust valve, and the water jacket is provided in the vicinity of the intake port. Since the heat conductor that exchanges heat between the combustion chamber and the water jacket is provided, the heat in the combustion chamber is transferred to the water jacket by the heat conductor, so that it is cooled in the cold state. While water can be heated early to promote warm-up, the combustion chamber can be cooled to suppress knocking during the warm state, and the structure can be simplified.

  Embodiments of an internal combustion engine according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  1 is a sectional view of the vicinity of a combustion chamber representing an internal combustion engine according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a schematic configuration representing the internal combustion engine of the first embodiment. FIG.

  In the first embodiment, as shown in FIGS. 1 to 3, an engine 11 as an internal combustion engine is a spark ignition engine, and a cylinder head 13 is fastened on a cylinder block 12. Pistons 15 are respectively fitted to the formed cylinder bores 14 so as to be movable up and down. A crankshaft 16 is rotatably supported at a lower portion of the cylinder block 12, and each piston 15 is connected to the crankshaft 16 via a connecting rod 17.

  The combustion chamber 18 includes a cylinder block 12, a cylinder head 13, and a piston 15. Two intake ports 19 and an exhaust port 20 face the upper portion of the combustion chamber 18, that is, the lower surface of the cylinder head 13. The lower end portions of the intake valves 21 and the exhaust valves 22 are located with respect to the intake ports 19 and the exhaust ports 20, respectively. Accordingly, when the intake valve 21 and the exhaust valve 22 move up and down at a predetermined timing, the intake port 19 and the exhaust port 20 are opened and closed, and the intake port 19 and the combustion chamber 18, and the combustion chamber 18 and the exhaust port 20 are respectively opened and closed. You can communicate. The cylinder block 12 is provided with a water jacket 23 positioned outside the cylinder bore 14, and the cylinder head 13 is provided with a water jacket 24 on the intake side and the exhaust side, and in the middle thereof.

  An intake pipe 26 is connected to the intake port 19 via an intake manifold 25. An air cleaner 27 is attached to the air intake port of the intake pipe 26, and a throttle valve is provided downstream of the air cleaner 27. An electronic throttle device 28 is provided. The cylinder head 13 is equipped with an injector (fuel injection means) 29 for injecting fuel into the intake port 19 and an ignition plug 30 for igniting the air-fuel mixture located above the combustion chamber 18. .

  On the other hand, an exhaust pipe 32 is connected to the exhaust port 20 via an exhaust manifold 31, and the exhaust pipe 32 is a catalyst device that purifies harmful substances such as HC, CO, NOx contained in the exhaust gas. 33 is attached.

  The engine 11 is equipped with an electronic control unit (ECU) 34, which can control the fuel injection timing of the injector 29, the ignition timing of the spark plug 30, and the like. The fuel injection amount, the injection timing, the ignition timing, and the like are determined based on the engine operating state such as the throttle opening (or the accelerator opening) and the engine speed. That is, an air flow sensor 35 is mounted on the upstream side of the intake pipe 24 and outputs the measured intake air amount to the ECU 34. Further, the electronic throttle device 28 outputs the current throttle opening degree to the ECU 34, and the engine speed sensor 36 outputs the detected engine speed to the ECU 34.

  The engine 11 of the present embodiment is provided with a heat pipe 41 as a heat conductor that exchanges heat between the combustion chamber 18 and the intake port 19. The heat pipe 41 is configured by sealing a predetermined amount of water, chlorofluorocarbon, sodium, or the like as a working fluid in a closed hollow cylindrical pipe in a vacuum state, and an upper end portion is a condensing portion (heat radiating portion) 41a. The lower end portion is an evaporation portion (heat input portion) 41b. The heat pipe 41 is formed with a wick (not shown) as a capillary section that returns the liquid working fluid condensed on the inner wall surface from the condensing part 41a to the evaporating part 41b. Therefore, the heat pipe 41 is located below the mounting hole 42 formed in the cylinder head 13 between the pair of intake ports 19 and one end communicating with the combustion chamber 18, that is, the combustion pipe 41. It is fixed at a predetermined position by being press-fitted from the chamber 18 side. The condenser 41a of the heat pipe 41 is exposed in the vicinity of the wall surface of the intake port 19 where the fuel spray injected from the injector 29 reaches, while the evaporator 41b communicates with the intake port 19 in the combustion chamber 18. It will be exposed in the vicinity of the part.

  In the engine 11 of the first embodiment configured as described above, when a predetermined amount of fuel corresponding to the throttle opening is injected 19 from the injector 29 to the intake port, a mixture of air and fuel is generated at the intake port 19. When the intake valve 21 is opened during the intake stroke in which the piston 15 descends, the air-fuel mixture in the intake port 19 is drawn into the combustion chamber 18. When the air-fuel mixture in the combustion chamber 18 is compressed after the compression stroke in which the piston 15 rises and is ignited by the spark plug 30, it expands and explodes in the combustion chamber 18, and the exhaust valve 22 is expanded in the exhaust stroke. When opened, the exhaust gas in the combustion chamber 18 is discharged to the exhaust port 20.

  In the combustion stroke of the engine 11, at the time of start-up, the intake port 19 is not sufficiently warm and is in a cold state, and the fuel spray injected from the injector 29 is less likely to be vaporized. It cannot adhere and mix well with air. On the other hand, the combustion chamber 18 is in a high temperature state due to the combustion of the air-fuel mixture. At this time, in the heat pipe 41, the internal working fluid stays in the lower evaporation section 41b, and in this evaporation section 41b, the working fluid absorbs heat from the high-temperature combustion gas by heat exchange, and changes from liquid to vapor. Change. Then, the working fluid that has become steam flows upward in the heat pipe 41 and reaches the condensing part 41a, where the steam working fluid dissipates heat by heat exchange in the vicinity of the intake port 19 and condenses from the steam. The working fluid that has changed to a liquid state and turned into a liquid flows downward in the heat pipe 16 by gravity and wick, and reaches the evaporation section 41b. Therefore, the heat generated in the combustion chamber 18 is transmitted to the vicinity of the intake port 19 by the working fluid of the heat pipe 41, and the intake port 19 is warmed to vaporize the fuel spray injected from the injector 29. As a result, fuel adhesion to the inner wall surface of the intake port 19 can be suppressed and the air can be mixed well with air, and warming up of the engine 11 can be promoted.

  On the other hand, in the combustion stroke of the engine 11, especially during high load operation after warm-up, the intake port 19 is in a warm state in which it is sufficiently warmed, and the fuel spray injected by the injector 29 is vaporized early and air. And can be mixed well. On the other hand, in the combustion chamber 18, flame propagates from the vicinity of the spark plug 30 toward the intake port 19, but when the intake port side becomes a high temperature state, self-ignition occurs and knocking occurs. At this time, in the heat pipe 41, as described above, the internal working fluid changes its state from a liquid to a vapor by the high-temperature combustion gas in the lower evaporation section 41b, and the working fluid that has become the vapor in the heat pipe 41 To the condensing part 41a, dissipate heat by heat exchange in the vicinity of the intake port 19 and condense, and change the state from vapor to liquid. The working fluid that has become liquid flows downward in the heat pipe 16 due to gravity and wick, and reaches the evaporation section 41b. Therefore, the heat generated in the vicinity of the intake port 21 in the combustion chamber 18, that is, in the vicinity of the intake valve 21 is transmitted to the vicinity of the intake port 19 by the working fluid of the heat pipe 41. By locally cooling, self-ignition in this part can be prevented, occurrence of knocking can be suppressed, and drivability can be improved.

  As described above, in the engine 11 of the first embodiment, the intake port 19 and the exhaust port 20 communicating with the combustion chamber 18 are provided, and the intake port 19 and the exhaust port 20 can be opened and closed by the intake valve 21 and the exhaust valve 22. In addition, an injector 29 that injects fuel into the intake port 19 is provided, and a heat pipe 41 that exchanges heat between the combustion chamber 18 and the intake port 19 is provided.

  Accordingly, the heat of the combustion chamber 18 is transmitted to the intake port 19 by the heat pipe 41, so that when the engine 11 is cold, the intake port 19 is heated early and the fuel spray injected from the injector 29 to the intake port 19. Will be vaporized early and mixing with air will be promoted, warming up can be performed efficiently, and by atomization, fuel can be homogenized especially in homogeneous lean burn combustion, Exhaust gas characteristics and fuel consumption can be improved. On the other hand, when the engine 11 is warm, the combustion chamber 18 is locally cooled, and knocking can be suppressed by preventing self-ignition.

  In addition, while suppressing the occurrence of knocking and promoting warm-up, the increase in the number of parts and the complexity of the structure can be suppressed as much as possible, the engine output can be improved with a simple configuration, and the driver Can be improved.

  FIG. 4 is a cross-sectional view of the vicinity of the combustion chamber representing the internal combustion engine according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the second embodiment, as shown in FIG. 4, an engine 51 as an internal combustion engine has substantially the same configuration as that of the first embodiment described above. In the engine 51 of the present embodiment, a heat conduction rod (heat conductor) 52 for exchanging heat between the combustion chamber 18 and the intake port 19 and the water jacket 24 is provided through the water jacket 24. Yes. The heat conducting rod 52 is made of copper, which is a material having higher heat conductivity than the aluminum cylinder head 13. Accordingly, the heat conducting rod 52 is inserted into the mounting hole 53 formed in the cylinder head 13 between the pair of intake ports 19 and through the water jacket 24 so that one end communicates with the combustion chamber 18. On the other hand, it is fixed at a predetermined position by being press-fitted from the combustion chamber 18 side. The upper end portion 52a of the heat conducting rod 52 is located in the vicinity of the wall surface of the intake port 19 to which the fuel spray injected from the injector 29 arrives, while the lower end portion 52b is a communication portion with the intake port 19 in the combustion chamber 18. It will be located in the vicinity.

  The heat conduction rod 52 is made of copper having a higher thermal conductivity than the aluminum cylinder head 13, but in the case of an iron cylinder head, it may be an aluminum heat conduction rod, and the material is: However, the present invention is not limited to these, and the heat conduction rod may be formed of a material having a higher heat conductivity than that of the cylinder head 13. Further, since the heat conduction rod 52 is provided so as to penetrate the water jacket 24, a seal member (not shown) is interposed between the mounting hole 53 and the heat conduction rod 52, and the inside of the water jacket 24 is cooled. Prevents water leakage.

  In the engine 52 of the second embodiment configured as described above, the heat generated in the combustion chamber 18 is transmitted to the vicinity of the water jacket 24 and the intake port 19 by the heat conducting rod 52 when cold. Therefore, the cooling water in the water jacket 24 is heated, and the intake port 19 is warmed to promote the vaporization of the fuel spray injected from the injector 29, so that the fuel adheres to the inner wall surface of the intake port 19. It can suppress and can mix well with air, and can aim at warming-up promotion of the engine 51. FIG.

  On the other hand, during the warm period, the heat generated in the vicinity of the intake port 21 in the combustion chamber 18, that is, in the vicinity of the intake valve 21, is transferred to the vicinity of the water jacket 24 and the intake port 19 by the heat conduction rod 52. Since the combustion chamber 18 is locally cooled, self-ignition in this portion can be prevented, occurrence of knocking can be suppressed, and drivability can be improved.

  As described above, in the engine 51 of the second embodiment, the heat conduction rod 52 that exchanges heat between the combustion chamber 18 and the intake port 19 is made of a material having higher heat conductivity than the cylinder head 13 made of aluminum. It is made of copper, and this heat conducting rod 52 is provided through the water jacket 24 of the cylinder head 13.

  Accordingly, the heat in the combustion chamber 18 is transmitted to the water jacket 24 and the intake port 19 by the heat conducting rod 52, so that the cooling water and the intake port 19 are heated early when the engine 51 is cold, and the intake air is supplied from the injector 29. The fuel spray injected into the port 19 is vaporized early and mixing with the air is promoted, so that warm-up can be performed efficiently. On the other hand, when the engine 51 is warm, the combustion chamber 18 is locally localized. It is possible to suppress knocking by being cooled to a low temperature and preventing self-ignition. Further, by making the heat conducting rod 52 made of copper, it is strong against impact and can improve the reliability, and it is easy to process, and the cost can be reduced.

  FIG. 5 is a cross-sectional view of the vicinity of a combustion chamber representing an internal combustion engine according to Embodiment 3 of the present invention, and FIG. 6 is a cross-sectional view illustrating a heat pipe attachment state. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the third embodiment, as shown in FIGS. 5 and 6, an engine 61 as an internal combustion engine has substantially the same configuration as that of the first embodiment described above. The engine 61 of the present embodiment is provided with a heat pipe 62 as a heat conductor that exchanges heat between the combustion chamber 18 and the water jacket 24. As in the first embodiment, the heat pipe 62 is configured by enclosing a predetermined amount of working fluid in a pipe in a vacuum state, with the upper end portion being a condensing portion 62a and the lower end portion being an evaporation portion 62b. Therefore, the heat pipe 62 is threaded from the combustion chamber 18 side to the mounting hole 63 formed through the cylinder head 13 below the intake port 19 from the combustion chamber 18 to the water jacket 24. Is fixed in place. The condensing part 62 a of the heat pipe 62 is located in the water jacket 24, while the evaporation part 62 b is located in the vicinity of the communicating part with the intake port 19 in the combustion chamber 18. Since the heat pipe 62 is provided in the water jacket 24, a seal member (not shown) is interposed in the screw portion 64 to prevent leakage of cooling water in the water jacket 24.

  In the engine 62 of the third embodiment configured as described above, when it is cold, heat generated in the combustion chamber 18 is transmitted to the water jacket 24 by the heat pipe 62, and the cooling water in the water jacket 24 is heated. Thus, the warm-up of the engine 61 can be promoted. On the other hand, at the time of warming, heat generated in the communication portion of the combustion chamber 18 with the intake port 16, that is, in the vicinity of the intake valve 21, is transmitted to the water jacket 24 by the heat pipe 62, and the combustion chamber 18 is locally cooled. As a result, self-ignition can be prevented, knocking can be suppressed, and drivability can be improved.

  As described above, in the engine 61 of the third embodiment, the heat pipe 62 that performs heat exchange between the combustion chamber 18 and the water jacket 24 is provided in the cylinder head 13.

  Therefore, the heat in the combustion chamber 18 is transmitted to the water jacket 24 by the heat pipe 62, so that when the engine 51 is in a cold state, the cooling water in the water jacket 24 is heated at an early stage to efficiently warm up. On the other hand, when the engine 15 is warm, the combustion chamber 18 is locally cooled, and knocking can be suppressed by preventing self-ignition. Further, since the heat pipe 62 is fixed to the mounting hole 63 of the cylinder head 13 by the screw portion 64, the heat pipe 62 can be easily attached, and the operation cost can be reduced.

  FIG. 7 is a cross-sectional view of the vicinity of a combustion chamber representing an internal combustion engine according to Embodiment 4 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the fourth embodiment, as shown in FIG. 7, an engine 71 as an internal combustion engine has substantially the same configuration as that of the first embodiment, but the cylinder head 72 has a vertically divided structure. That is, the cylinder head 72 has an upper head 72a and a lower head 72b, and the upper head 72a and the lower head 72b are connected together by a fastening bolt (not shown) in a state where they are combined vertically at a predetermined position. Thus, an intake port 19 and an exhaust port 20, a plurality of water jackets 24, and the like are configured.

  Further, in the engine 71 of the present embodiment, a heat pipe 73 that performs heat exchange between the combustion chamber 18 and the intake port 19 and the water jacket 24 is enclosed. As in the first embodiment, the heat pipe 73 is configured such that a predetermined amount of working fluid is sealed in a pipe in a vacuum state, and an upper end portion is a condensing portion 73a and a lower end portion is an evaporation portion 73b. The heads 72a and 72b are provided with mounting holes 74a and 74b for enclosing the heat pipe 73 together with the recesses 24a and 24b for the water jacket 24. Therefore, with the evaporation portion 73b of the heat pipe 73 fitted in the mounting hole 74b of the lower head 72b, the upper head 72a is assembled so that the condensing portion 73a fits in the mounting hole 74a, and between the heads 72a and 72b. The heat pipe 73 is sealed in the cylinder head 72 by fastening through a seal member (not shown). Then, the condensing part 73a of the heat pipe 73 penetrates the water jacket 24 and is located below the intake port 19, while the evaporation part 73b is located in the vicinity of the communicating part with the intake port 19 in the combustion chamber 18. .

  In the engine 73 of the fourth embodiment configured as described above, heat generated in the combustion chamber 18 is transmitted to the vicinity of the water jacket 24 and the intake port 19 by the heat pipe 73 when cold. Therefore, the cooling water in the water jacket 24 is heated, and the intake port 19 is warmed to promote the vaporization of the fuel spray injected from the injector 29, so that the fuel adheres to the inner wall surface of the intake port 19. It can suppress and can mix well with air, and can aim at warming-up promotion of the engine 71. FIG.

  On the other hand, during the warm period, the heat generated in the vicinity of the intake port 21 in the combustion chamber 18, that is, in the vicinity of the intake valve 21, is transmitted to the vicinity of the water jacket 24 and the intake port 19 by the heat pipe 73. Since the combustion chamber 18 is locally cooled, self-ignition in this portion can be prevented, knocking can be suppressed, and drivability can be improved.

  As described above, in the engine 71 of the fourth embodiment, the cylinder head 72 has a vertically divided structure, and between the upper head 72a and the lower head 72b, between the combustion chamber 18, the intake port 19, and the water jacket 24. A heat pipe 73 for heat exchange is enclosed and provided.

  Therefore, the heat of the combustion chamber 18 is transmitted to the water jacket 24 and the intake port 19 by the heat pipe 73, so that the cooling water and the intake port 19 are heated early when the engine 71 is cold, and the intake port is supplied from the injector 29 to the intake port. The fuel spray injected into the fuel 19 is vaporized early and mixing with the air is promoted, so that warm-up can be performed efficiently. On the other hand, when the engine 71 is warm, the combustion chamber 18 is locally It is cooled and knocking can be suppressed by preventing self-ignition. Further, by enclosing the heat pipe 73 in the cylinder head 72, the water jacket 24 can be easily sealed, the cooling water can be surely leaked, and the cost can be reduced.

  In the first, third, and fourth embodiments described above, the heat pipes 41, 62, and 73 are used as the heat conductor. In the second embodiment, the heat conduction rod 52 is used as the heat conductor. However, the present invention is limited to this combination. It is not something. In each of the above-described embodiments, the heat pipes 41, 62, 73 or the heat conduction rod 52 is provided between the pair of intake ports 19 as a heat conductor. However, the present invention is not limited to this position. The mounting position, that is, the cooling position may be changed according to the engine characteristics, the knock characteristics, etc., and may be between the intake port 19 and the exhaust port 20, for example. Further, two heat conductors may be provided directly below each intake port 19 without providing one heat conductor between the pair of intake ports 19.

  As described above, the internal combustion engine according to the present invention is capable of suppressing knocking and promoting warm-up by providing a heat conductor that exchanges heat between the combustion chamber and the intake port or the water jacket. It is useful for any type of internal combustion engine.

It is sectional drawing of the combustion chamber vicinity showing the internal combustion engine which concerns on Example 1 of this invention. It is II-II sectional drawing of FIG. 1 is a schematic configuration diagram illustrating an internal combustion engine according to a first embodiment. It is sectional drawing of the combustion chamber vicinity showing the internal combustion engine which concerns on Example 2 of this invention. It is sectional drawing of the combustion chamber vicinity showing the internal combustion engine which concerns on Example 3 of this invention. It is sectional drawing showing the attachment state of a heat pipe. It is sectional drawing of the combustion chamber vicinity showing the internal combustion engine which concerns on Example 4 of this invention.

Explanation of symbols

11, 51, 61, 71 Engine (Internal combustion engine)
12 Cylinder block 13, 72 Cylinder head 18 Combustion chamber 19 Intake port 21 Intake valve 24 Water jacket 29 Injector (fuel injection means)
30 Spark plug 41, 62, 73 Heat pipe (heat conductor)
52 Heat conduction rod (heat conductor)

Claims (7)

  A combustion chamber, an intake port and an exhaust port communicating with the combustion chamber, an intake valve and an exhaust valve for opening and closing the intake port and the exhaust port, fuel injection means for injecting fuel into the intake port, and the combustion chamber An internal combustion engine comprising: a heat conductor that exchanges heat with the intake port.   2. The internal combustion engine according to claim 1, wherein one end portion of the heat conductor is located in the vicinity of a wall surface of the intake port to which the fuel spray injected from the fuel injection means reaches.   A combustion chamber; an intake port and an exhaust port communicating with the combustion chamber; an intake valve and an exhaust valve that opens and closes the intake port and the exhaust port; fuel injection means that injects fuel into the intake port; and the intake port An internal combustion engine comprising: a water jacket provided in the vicinity of the engine; and a heat conductor that exchanges heat between the combustion chamber and the water jacket.   The internal combustion engine according to claim 1, wherein one end portion of the heat conductor is located in the vicinity of a communication portion with an intake port in the combustion chamber.   4. The internal combustion engine according to claim 1, wherein the heat conductor is a heat pipe in which a working fluid is enclosed, and an evaporation portion at one end is positioned in the vicinity of the combustion chamber, and a condensation portion at the other end. Is located in the vicinity of the intake port or the water jacket.   4. The internal combustion engine according to claim 1, wherein the heat conductor is a rod-shaped body made of a material having a higher thermal conductivity than the cylinder head. 4. The internal combustion engine according to claim 1, wherein a cylinder head is configured by fastening an upper head and a lower head, and the thermal conductor is provided by being enclosed in a fastening surface between the upper head and the lower head. An internal combustion engine characterized by that.

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