JP4985210B2 - Cylinder head and heater piping structure - Google Patents

Description

  The present invention relates to a cylinder head and a heater piping structure. In particular, the present invention relates to a cylinder head and a heater piping structure in which a cylinder head and an exhaust manifold are integrally formed.

  In a conventional internal combustion engine, an exhaust pipe is attached to a cylinder head, and exhaust gas after combustion of fuel is discharged from the cylinder of the internal combustion engine to the exhaust pipe during operation of the internal combustion engine. Further, in an internal combustion engine having a plurality of cylinders, the exhaust pipe is attached to the cylinder head according to the number of cylinders, and the plurality of exhaust pipes are downstream of the cylinder head in the exhaust gas flow direction. It is gathered and provided. Thereby, the exhaust gas is discharged through one exhaust passage.

  Further, some conventional internal combustion engines are provided with a supercharging device that increases the intake air amount of the internal combustion engine, that is, performs supercharging, for the purpose of improving performance such as output. As the supercharging device provided in the internal combustion engine as described above, supercharging using the energy of exhaust gas or supercharging using the output during operation of the internal combustion engine extracted by the rotation of the crankshaft of the internal combustion engine is used. There is something that pays.

  There are various types of superchargers as described above. Of these, a so-called turbocharger, which is a supercharger that performs supercharging using the energy of exhaust gas, is used in the flow direction of exhaust gas. It is provided on the downstream side of the collecting portion of the exhaust pipe. This turbocharger performs supercharging using the energy of the exhaust gas, but since the position where the turbocharger is provided is downstream of the collective portion of the exhaust pipe in this way, The distance from the combustion chamber of the cylinder to the turbocharger is longer.

  For this reason, a predetermined time is required until the exhaust gas discharged from the combustion chamber reaches the turbocharger. As a result, for example, there is a slight time delay until the exhaust gas discharged from the combustion chamber at the time of sudden acceleration of the internal combustion engine reaches the turbocharger and the supercharging is performed by the exhaust gas. Turbo lag occurs. In the turbocharger, the turbo lag is generated in this way. Therefore, in order to reduce the turbo lag, the distance of the exhaust pipe from the combustion chamber to the turbocharger, that is, the distance from the combustion chamber to the collection part of the exhaust pipe It is effective to shorten the length, and as one of the methods, it is conceivable to collect the exhaust pipes in the cylinder head.

  However, the collection part of the exhaust pipe is a part where high-temperature exhaust gas discharged from the combustion chambers of a plurality of cylinders collects, so it tends to become high temperature. When the exhaust pipes are gathered in the cylinder head, the cylinder The head may become too hot. For this reason, some conventional internal combustion engines collect exhaust pipes in the cylinder head while preventing the cylinder head from becoming too hot.

  For example, in a turbocharged engine described in Patent Document 1, exhaust passages are gathered inside a cylinder head, cooling water after combustion chamber cooling is circulated in a water jacket provided on the outer periphery of the gathering portion, and The downstream end of the section is connected to a turbocharger. Thereby, the distance of the exhaust passage from the combustion chamber to the turbocharger can be shortened, and further, the collecting portion of the exhaust passage can be cooled with the cooling water. Therefore, it is possible to shorten the distance of the exhaust passage from the combustion chamber to the turbocharger while suppressing the cylinder head from becoming too high due to the exhaust gas gathering, and to reduce the turbo lag.

Japanese Patent No. 2527559

  However, since the temperature of the collecting portion of the exhaust passage becomes high, there is a possibility that the temperature of the cooling water will rise excessively when the cooling water continues to flow around the outer periphery of the collecting portion. Thus, if the temperature of the cooling water rises too much, the amount of heat exchanged with the combustion chamber becomes small even when the cooling water flows in the vicinity of the combustion chamber, and the temperature of the combustion chamber is effectively reduced. May become difficult. Such a problem occurs when the temperature of the cooling water rises too much. Therefore, it is preferable to flow the cooling water so that the temperature does not rise too much, but in order to prevent the temperature of the cooling water from rising too much. For this reason, it is better not to flow the cooling water in the vicinity of the collecting portion of the exhaust passage.

  However, the cooling water is used not only for cooling the internal combustion engine but also as a heat source for a heater provided for air conditioning in a vehicle interior. In other words, since the temperature of the cooling water is increased by exchanging heat with the heat generated in the combustion chamber of the internal combustion engine, some cooling water is used as a heat source for the heater used when raising the temperature in the vehicle interior. is there. In this case, the temperature of the cooling water needs to be high when the heater is used, but the temperature of the cooling water is low during the warm-up operation at the cold start. For this reason, at the time of warm-up operation, it may be difficult to raise the temperature inside the vehicle with a heater. Therefore, when the heater is used during the warm-up operation of the internal combustion engine, it is necessary to raise the temperature of the cooling water at an early stage, but the cooling water is supplied to the exhaust passage for the purpose of raising the temperature of the cooling water early. When it flows in the vicinity, the temperature of the cooling water may increase excessively during normal operation after warm-up operation.

  In addition, various types of fluids other than cooling water are used in internal combustion engines, but in these fluids, as with cooling water, the temperature rises early during warm-up operation during cold start. It is desirable to cause the malfunction to occur if the temperature rises excessively during normal operation. For example, the lubricating oil used to lubricate the operating part during operation of the internal combustion engine has a high viscosity when the temperature is low, and thus there is a risk that the resistance during operation of the internal combustion engine becomes too large. For this reason, it is desirable that the temperature of the lubricating oil be raised at an early stage during warm-up operation at the time of cold start. However, if the temperature rises excessively during normal operation, there is a risk that deterioration will be accelerated. As described above, among the fluids used during the operation of the internal combustion engine, it is desirable to increase the temperature early during the warm-up operation of the internal combustion engine, but when the temperature of the fluid is increased quickly, There is a risk that problems may occur during normal operation.

  The present invention has been made in view of the above, and raises the temperature of a fluid whose temperature rise is desired at an early stage during warm-up operation of the internal combustion engine, and suppresses problems during normal operation of the internal combustion engine. It is an object of the present invention to provide a cylinder head and a heater piping structure that can be used.

  In order to solve the above-described problems and achieve the object, a cylinder head according to the present invention is provided as a passage through which exhaust gas of an internal combustion engine flows, and is provided in a combustion chamber of a plurality of cylinders of the internal combustion engine. An exhaust passage having a plurality of branch passages to be connected and a collecting portion formed by aggregating the plurality of branch passages, and an early temperature during warm-up operation of the internal combustion engine among fluids used during operation of the internal combustion engine And an early heating fluid flow means capable of taking out the early heating fluid, which is the fluid desired to be raised, immediately after flowing out of the collecting portion during the warm-up operation.

  In the present invention, an exhaust passage is provided in the cylinder head, a collecting portion is formed in the exhaust passage, and an early heating fluid flow means is provided. Among these, the collection portion of the exhaust passage is a portion where exhaust gas after combustion of the fuel in the internal combustion engine collects, so that the temperature is likely to be high, and other portions even during the warm-up operation of the internal combustion engine. The temperature is likely to be higher than that. For this reason, the early heating fluid flowing means is provided, and the early heating fluid immediately after the heat of the collecting portion is transferred can be taken out by taking out the early heating fluid immediately after flowing out of the collecting portion during the warm-up operation. . Thereby, since the early heating fluid in the state where temperature became high can be taken out, the temperature of the early heating fluid can be raised at the time of warm-up operation.

  In addition, during the warm-up operation, by removing the early heating fluid immediately after flowing out of the collecting portion, the early heating fluid is extracted in a state other than immediately after flowing out of the collecting portion during normal operation of the internal combustion engine. In addition, it is possible to suppress problems caused by the fact that the early heating fluid immediately after flowing out of the collecting portion is continuously taken out. As a result, it is possible to quickly raise the temperature of a fluid whose temperature is desired to rise early during the warm-up operation of the internal combustion engine, and to suppress problems during normal operation of the internal combustion engine.

  In the cylinder head according to the present invention, the early heating fluid is a cooling medium used for cooling the internal combustion engine, and the early heating fluid flow means is provided as a cooling medium passage. Is formed outside the collecting portion and communicates with a portion of the cooling medium passage formed outside the collecting portion, and the cooling medium outlet port during the warm-up operation of the internal combustion engine And an outlet for normal operation that is an outlet for the cooling medium during normal operation of the internal combustion engine.

  In the present invention, the early heating fluid is a cooling medium used for cooling the internal combustion engine, and the early heating fluid flow means has a part of the cooling medium passage formed outside the gathering portion, and further, is taken during warm-up operation. It is formed by providing an outlet and a normal operation outlet. For this reason, the cooling medium, which is a fluid whose temperature is desired to be raised early during the warm-up operation of the internal combustion engine, is taken out from the outlet during the warm-up operation immediately after flowing out of the collecting portion during the warm-up operation. Therefore, the temperature of the cooling medium can be raised early during the warm-up operation.

  Also, it is during the warm-up operation that the cooling medium immediately after flowing out of the collecting portion is taken out, and during normal operation, the cooling medium other than immediately after flowing out of the collecting portion is taken out from the outlet during normal operation. In normal operation, it is possible to suppress problems caused by the cooling medium immediately after flowing out of the collecting portion being taken out. As a result, the temperature of the cooling medium, which is a fluid whose temperature is desired to be increased early during the warm-up operation of the internal combustion engine, can be increased quickly, and problems during normal operation of the internal combustion engine can be suppressed.

  A heater piping structure according to the present invention is provided in the cylinder head, a heater capable of raising the temperature of the air by exchanging heat between the cooling medium and air, and the cylinder head. A cooling medium pipe connecting the cooling medium path and the heater, and a cooling medium path connected to the cooling medium pipe and flowing from the cooling medium path to the heater. Switching means that sometimes switches from the outlet for early heating to the path that flows to the heater, and that can switch from the outlet for normal operation to the path that flows to the heater during normal operation of the internal combustion engine. .

  In this invention, the cooling medium pipe connecting the cooling medium passage of the cylinder head and the heater can be switched so that the path of the cooling medium flowing from the cooling medium passage to the heater can be switched between the warm-up operation and the normal operation of the internal combustion engine. Connecting means. For this reason, during the warm-up operation, the path of the cooling medium flowing from the cooling medium passage to the heater is switched to the path flowing from the outlet during early heating to the heater, so that during the warm-up operation, immediately after flowing out of the collecting portion The cooling medium can flow from the outlet during warm-up operation to the heater. Thereby, during the warm-up operation, the temperature of the cooling medium can be raised early, and the cooling medium whose temperature has risen early can be passed through the heater.

  In addition, it is during the warm-up operation that the path of the cooling medium flowing from the cooling medium passage to the heater is switched to the path flowing from the outlet at the time of early heating to the heater. During normal operation, the path of the cooling medium is changed during normal operation. Switch to the path from the outlet to the heater. For this reason, the malfunction resulting from taking out the cooling medium immediately after flowing out of the gathering part from the outlet at the time of early heating can be suppressed during normal operation. As a result, the temperature of the cooling medium, which is a fluid whose temperature is desired to be increased early during the warm-up operation of the internal combustion engine, can be increased quickly, and problems during normal operation of the internal combustion engine can be suppressed.

  In the cylinder head according to the present invention, the early heating fluid is lubricating oil used for lubrication during operation of the internal combustion engine, and the early heating fluid flow means is used during warm-up operation of the internal combustion engine. The lubricating oil is provided so as to be sprayable toward the collecting portion.

  In this invention, the early heating fluid is a lubricating oil used for lubrication during operation of the internal combustion engine, and the early heating fluid flow means is provided so that the lubricating oil can be sprayed toward the collecting portion during the warm-up operation of the internal combustion engine. Is formed. For this reason, lubricating oil, which is a fluid whose temperature is desired to be raised early during the warm-up operation of the internal combustion engine, is blown toward the collective portion during the warm-up operation, so that lubrication occurs immediately after flowing outside the collective portion. Since the oil can be taken out, the temperature of the lubricating oil can be raised early during the warm-up operation.

  Further, the lubricating oil is sprayed toward the collecting portion during the warm-up operation, and during normal operation, the lubricating oil is circulated without being sprayed toward the collecting portion. For this reason, the malfunction resulting from lubricating oil flowing out of a gathering part at the time of normal operation can be controlled. As a result, it is possible to quickly raise the temperature of the lubricating oil, which is a fluid that is desired to rise in temperature early during the warm-up operation of the internal combustion engine, and to suppress problems during normal operation of the internal combustion engine.

  In the cylinder head according to the present invention, the exhaust passage is connected to the plurality of branch passages and is provided with a connection passage having the collecting portion, and the connection passage is formed in a spiral shape. At least one of a groove or a protrusion is formed, and further, an exhaust gas component capable of detecting a component of the exhaust gas on the downstream side of the collecting portion in the flow direction of the exhaust gas flowing through the exhaust passage A detection means is provided.

  In the present invention, a connection passage is provided in the exhaust passage, and at least one of a spirally formed groove or protrusion is formed in the connection passage. As a result, the exhaust gas flowing through the exhaust passage can be rectified, and further, an exhaust gas component detection means capable of detecting the exhaust gas component is provided downstream of the collecting portion of the exhaust passage. . For this reason, since the exhaust gas component detection means can detect the component of the exhaust gas after being rectified by the spiral grooves and protrusions formed in the connection passage, it is possible to suppress variations in detection. As a result, the exhaust gas component can be detected with high accuracy.

  The cylinder head according to the present invention has an effect that the temperature of a fluid whose temperature rise is desired at an early stage during the warm-up operation of the internal combustion engine can be raised at an early stage, and problems during the normal operation of the internal combustion engine can be suppressed. Play. The heater piping structure according to the present invention is capable of quickly increasing the temperature of a fluid that is desired to rise in temperature early during the warm-up operation of the internal combustion engine and suppressing problems during normal operation of the internal combustion engine. Play.

  Embodiments of a cylinder head and a heater piping structure 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. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a plan view of a cylinder head according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. A cylinder head 1 shown in the figure constitutes a part of an internal combustion engine (not shown) mounted on a vehicle or the like, and is formed so as to be fixed to a cylinder block (not shown) included in the internal combustion engine. Specifically, the cylinder head 1 is formed so as to be fixed to the upper start side of a piston (not shown) of the internal combustion engine in the cylinder block. For this reason, the cylinder head 1 is provided with a plurality of through holes 18 through which fixing bolts (not shown) for fixing the cylinder head 1 to the cylinder block pass. The through hole 18 is formed as a hole penetrating from the mounting surface 4 which is a surface to be attached to the cylinder block in the cylinder head 1 to the cylinder head upper surface 3 which is a surface located on the opposite side of the mounting surface 4. Yes.

  Further, the internal combustion engine having the cylinder head 1 and the cylinder block in this way has a plurality of cylinders (not shown) in which pistons are provided, and the cylinder head 1 has combustion chambers 8 corresponding to the respective cylinders. A plurality are formed. That is, since the internal combustion engine having the cylinder head 1 according to the first embodiment is provided with four cylinders arranged in a straight line, the combustion chamber 8 formed in the cylinder head 1 also corresponds to a plurality of cylinders. Like the plurality of cylinders, they are arranged in a straight line. The plurality of combustion chambers 8 formed in this way are formed on the mounting surface 4 side of the cylinder head 1, and are formed to be recessed from the mounting surface 4 in a substantially curved shape.

  The combustion chamber 8 is connected to an exhaust passage 10 provided as a passage through which exhaust gas from the internal combustion engine flows during operation of the internal combustion engine. The exhaust passage 10 has a plurality of branch passages 11 connected to the combustion chambers 8 of a plurality of cylinders. The branch passages 11 are provided corresponding to a plurality of combustion chambers 8 formed in the same number as the number of combustion chambers 8. Thus, the branch passages 11 provided in the same number as the combustion chambers 8 are connected to the combustion chambers 8 and open to the combustion chambers 8.

  Further, the exhaust passage 10 has a straight passage 12 that is a passage formed in a straight line along a direction in which a plurality of combustion chambers 8 are arranged. A plurality of branch passages 11 are connected to the straight passage 12, and thus the straight passage 12 is provided as a connection passage. As described above, the plurality of branch passages 11 connected to the straight passage 12 are connected to the straight passage 12 at the end located on the opposite side of the end connected to the combustion chamber 8.

  Further, the exhaust passage 10 has a collecting passage 13 that is a passage formed from the straight passage 12 to the cylinder head side surface 6 that is the side surface of the cylinder head 1. The collecting passage 13 has one end connected to the straight passage 12 and opened to the straight passage 12, and the other end connected to the cylinder head side surface 6 and opened to the cylinder head side surface 6. In this way, an exhaust pipe (not shown), which is a pipe provided in the vehicle so that exhaust gas can be discharged to the atmosphere, is connected to a portion of the collecting passage 13 that opens to the side surface 6 of the cylinder head.

  Further, a portion of the straight passage 12 to which the collecting passage 13 is connected is a collecting portion 15. The straight passage 12 has the collecting portion 15 as described above, but a plurality of branch passages 11 are connected to the straight passage 12, and the collecting portion 15 is a portion to which the collecting passage 13 is connected. ing. Therefore, in other words, the collecting portion 15 is a portion formed by a plurality of branch passages 11 being gathered via the straight passage 12.

  The internal combustion engine is formed so that cooling water (not shown) that is a cooling medium used for cooling the internal combustion engine during operation can be circulated, and the cylinder head 1 has a cooling medium provided as a passage for the cooling water. A water jacket 20 that is a passage is formed. A water jacket 20 formed in the cylinder head 1 is provided in the vicinity of the combustion chamber 8 and in the vicinity of the exhaust passage 10. Specifically, the cylinder head 1 includes a cooling water inflow portion 31 that is an inflow portion of cooling water into the water jacket 20 formed in the cylinder head 1 and an outflow portion of cooling water from the water jacket 20. A cooling water outflow portion 32 is formed. The cooling water inflow portion 31 and the cooling water outflow portion 32 are arranged at both ends of the cylinder head 1 in the direction in which the plurality of combustion chambers 8 formed in the cylinder head 1 are arranged, that is, the plurality of combustion chambers 8 are arranged. Are provided at both ends of the cylinder head 1 in a linear direction. The water jacket 20 formed in the cylinder head 1 communicates with the cooling water inflow portion 31 and the cooling water outflow portion 32.

  Of the water jacket 20, the water jacket 20 provided in the vicinity of the combustion chamber 8 is a combustion chamber water jacket 21, and the water jacket 20 provided in the vicinity of the exhaust passage 10 is an exhaust passage water jacket 25. Yes. Among these, the combustion chamber water jacket 21 is located in the vicinity of the combustion chamber 8 and closer to the cylinder head upper surface 3 side than the combustion chamber 8 from the cooling water inflow portion 31 side to the cooling water outflow portion 32 side, avoiding the exhaust passage 10. Is formed.

  Further, the exhaust passage water jacket 25 is disposed in the vicinity of the exhaust passage 10 on the cylinder head upper surface 3 side and the mounting surface 4 side of the exhaust passage 10 and extends from the cooling water inflow portion 31 side to the cooling water outflow portion 32 side. Is formed. That is, the exhaust passage water jacket 25 is formed substantially along the straight passage 12 of the exhaust passage 10 and is disposed on the cylinder head upper surface 3 side and the attachment surface 4 side of the straight passage 12. For this reason, in the water jacket 20, an exhaust passage water jacket 25 which is a part of the water jacket 20 is formed in the vicinity of the collecting portion 15 or outside the collecting portion 15.

  Of the exhaust passage water jacket 25 provided in this way, the exhaust passage water jacket 25 provided on the cylinder head upper surface 3 side of the exhaust passage 10 further has a cylinder head side surface 6 direction in which the collective passage 13 of the exhaust passage 10 is opened. A take-out passage 26 which is a passage opened in the cylinder head side surface 6 is formed. The extraction passage 26 is provided on the cylinder head upper surface 3 side of the collecting passage 13 included in the exhaust passage 10, and is formed along the collecting passage 13. In addition, an opening portion opened to the cylinder head side surface 6 in the extraction passage 26 is an extraction passage opening portion 27.

  The take-out passage opening 27 is thus an opening of the take-out passage 26, and the take-out passage 26 is a portion formed outside the collecting portion 15 of the exhaust passage 10 in the water jacket 20. Since the exhaust passage water jacket 25 communicates with the exhaust passage water jacket 25, the extraction passage opening 27 communicates with the exhaust passage water jacket 25. That is, the extraction passage opening 27 is an opening communicating with the exhaust passage water jacket 25.

  FIG. 3 is a schematic view of a heater piping structure provided with the cylinder head shown in FIG. Thus, the cooling water flowing through the water jacket 20 formed in the cylinder head 1 is also used as a heat source of the heater 41 that can raise the temperature of the interior of the vehicle equipped with the internal combustion engine. For this reason, the water jacket 20 of the cylinder head 1 and the heater 41 are connected by a cooling water pipe 45 through which cooling water flows.

  Further, when the internal combustion engine is cold started, the temperature of the cooling water is low, but the cooling water is used not only for cooling the internal combustion engine but also as a heat source for the heater 41 in this way. During the warm-up operation of the internal combustion engine, it is preferable to raise the temperature early. For this reason, the cooling water is an early heating fluid that is a fluid that is desired to have an early temperature rise during the warm-up operation of the internal combustion engine among the fluids used during the operation of the internal combustion engine.

  Thus, the heater piping structure 40 in which the cooling water is an early heating fluid can increase the temperature of the air by performing heat exchange between the cooling water and the air, as shown in FIG. A cooling water pipe 45 that has a heater 41 and is a cooling medium pipe connects the water jacket 20 provided in the cylinder head 1 and the heater 41.

  The cooling water pipe 45 is connected to the cooling water inflow part 31, the cooling water outflow part 32, and the extraction passage opening 27, and is connected to the cooling water pipe 45 and the extraction passage opening 27 connected to the cooling water outflow part 32. The cooling water pipe 45 to be connected gathers into one cooling water pipe 45, and the gathered cooling water pipe 45 is connected to a heater inflow portion 42 that is an inflow portion of the cooling water in the heater 41. The cooling water pipe 45 connected to the cooling water inflow portion 31 is connected to a heater outflow portion 43 that is an outflow portion of the cooling water in the heater 41.

  Further, the cooling water pipe 45 connected to the cooling water outflow part 32 and the cooling water pipe 45 connected to the take-out passage opening 27 are gathered in one cooling water pipe 45. A switching valve 46 is connected to the assembly portion. That is, in the cooling water piping 45, the cooling water piping 45 connected to the cooling water outflow portion 32 and the cooling water piping 45 connected to the extraction passage opening 27 flow from the water jacket 20 to the heater 41. A switching valve 46 is provided as a switching means capable of switching the path of the cooling water from the outlet passage opening 27 to the heater 41 or from the cooling water outlet 32 to the heater 41. The switching valve 46 is connected to an ECU (Electronic Control Unit) (not shown) that controls each part of the vehicle, and is provided so as to be controllable by the ECU.

  The cylinder head 1 according to the first embodiment is configured as described above, and the operation thereof will be described below. During operation of the internal combustion engine having the cylinder head 1, fuel burns in the combustion chamber 8, and exhaust gas after combustion flows into an exhaust passage 10 connected to the combustion chamber 8. The exhaust gas flowing from the combustion chamber 8 into the exhaust passage 10 first flows into the respective branch passages 11 connected to each combustion chamber 8, and then flows from the branch passage 11 to the straight passage 12 connected to the branch passage 11. The exhaust gas that has flowed from the plurality of branch passages 11 to the straight passage 12 gathers at the gathering portion 15 of the straight passage 12 and flows from the gathering portion 15 to the gathering passage 13. The exhaust gas flowing in the collecting passage 13 flows into the exhaust pipe connected to the cylinder head side surface 6 and is discharged from the exhaust passage 10 provided in the cylinder head 1.

  Further, during operation of the internal combustion engine, cooling water circulates in the internal combustion engine, and the cooling water also flows to the water jacket 20 formed in the cylinder head 1. The water jacket 20 formed in the cylinder head 1 is formed with a combustion chamber water jacket 21 and an exhaust passage water jacket 25. Cooling water flowing through these water jackets 20 is generated when the internal combustion engine is warmed up. The route that flows depends on the normal operation. The warm-up operation here refers to an operation until the temperature of the cooling water rises to a predetermined temperature during the operation of the internal combustion engine, and the normal operation refers to the cooling water during the operation of the internal combustion engine. Operation in a state where the temperature has risen above a predetermined temperature. In addition, the predetermined temperature that is the criterion for switching between the warm-up operation and the normal operation is about 80 ° C.

  The coolant flowing through the water jacket 20 formed in the cylinder head 1 flows in different ways depending on whether the internal combustion engine is warmed up or in normal operation. Specifically, the heater piping including the cylinder head 1 is used. When the switching valve 46 of the structure 40 is switched between the warm-up operation and the normal operation of the internal combustion engine, the path through which the cooling water flows changes.

  First, during the warm-up operation of the internal combustion engine, the switching valve 46 releases the path that flows from the take-out passage opening 27 of the water jacket 20 through the cooling water pipe 45 to the heater 41 and from the cooling water outflow portion 32 to the cooling water. The path flowing through the pipe 45 to the heater 41 is blocked. In this way, by switching the switching valve 46, the path of the cooling water during the warm-up operation becomes a path that flows from the take-out passage opening 27 to the heater 41. Therefore, the cooling water in the water jacket 20 is taken out from the take-out passage opening. 27. That is, the take-out passage opening 27 is formed so that the cooling water can be taken out during the warm-up operation of the internal combustion engine, and is provided as a warm-up operation outlet that is a cooling water take-out port during the warm-up operation. . The extraction passage opening 27 is an opening of the extraction passage 26, and the extraction passage 26 is formed in the exhaust passage water jacket 25. For this reason, when the cooling water is taken out from the outlet passage opening 27, more cooling water flows through the exhaust passage water jacket 25.

  The exhaust passage water jacket 25 through which a large amount of cooling water flows during the warm-up operation is provided in the vicinity of the exhaust passage 10 and is formed along the straight passage 12 of the exhaust passage 10. For this reason, the cooling water flowing through the water jacket 20 formed in the cylinder head 1 can easily exchange heat with the exhaust gas flowing through the exhaust passage 10.

  Further, since the straight passage 12 has a collecting portion 15 and the exhaust gas flowing through the plurality of branch passages 11 gathers in the collecting portion 15, a large amount of exhaust gas flows through the collecting portion 15 and the temperature is high. It becomes easy to become. Since the exhaust passage water jacket 25 is formed along the straight passage 12, the cooling water flowing through the exhaust passage water jacket 25 flows outside the collecting portion 15, but the temperature of the collecting portion 15 is thus increased. Since it tends to be high, the cooling water flowing through the exhaust passage water jacket 25 exchanges heat with the exhaust gas of the collecting portion 15 that has become hot. For this reason, the temperature of the cooling water that has exchanged heat with the exhaust gas from the collecting portion 15 becomes high.

  The cooling water whose temperature has been increased by exchanging heat with the exhaust gas from the collecting portion 15 flows from the extraction passage opening 27 to the cooling water piping 45 through the extraction passage 26. The cooling water that has flowed from the outlet passage opening 27 to the cooling water pipe 45 passes through the switching valve 46 and then flows into the heater 41 from the heater inflow portion 42. The heater 41 into which the cooling water has flowed in this way performs heat exchange between the cooling water and the air flowing into the vehicle interior. That is, the cooling water that has flowed into the heater 41 is cooling water whose temperature has been increased by flowing outside the collecting portion 15 of the exhaust passage 10, so that the heater 41 exchanges heat between the cooling water and the air. When doing so, the heat of the cooling water is transferred to the air. As a result, the temperature of the air rises, and the air having a higher temperature flows in the vehicle interior.

  In addition, the cooling water that has exchanged heat with the air flowing in the vehicle interior by the heater 41 in this way is lower in temperature by the amount of heat transferred to the air and compared with that before flowing into the heater 41. In this state, the temperature is lowered and flows out from the heater outflow portion 43 to the cooling water pipe 45. The cooling water that has flowed out of the heater 41 into the cooling water pipe 45 flows again through the cooling water pipe 45 from the cooling water inflow portion 31 of the cylinder head 1 into the water jacket 20 formed in the cylinder head 1.

  Further, when the temperature of the cooling water rises to a predetermined temperature by continuing the warm-up operation, the operation of the internal combustion engine is switched to the normal operation. When the internal combustion engine is in a normal operation, the switching valve 46 releases the path that flows from the cooling water outflow portion 32 of the water jacket 20 through the cooling water piping 45 to the heater 41 and cools from the extraction passage opening 27. The path flowing through the water pipe 45 to the heater 41 is blocked. That is, the switching valve 46 switches the path of the cooling water flowing from the water jacket 20 to the heater 41 to the path flowing from the extraction passage opening 27 to the heater 41 during the warm-up operation of the internal combustion engine, and the cooling water during the normal operation of the internal combustion engine. It is provided so that it can be switched to a path that flows from the outflow portion 32 to the heater 41.

  During normal operation of the internal combustion engine, the switching valve 46 is switched in this way, so that the cooling water path during normal operation becomes a path that flows from the cooling water outflow portion 32 to the heater 41. For this reason, the cooling water in the water jacket 20 is taken out from the cooling water outflow portion 32, and this cooling water outflow portion 32 is provided as a normal operation outlet, which is a cooling water outlet in the normal operation of the internal combustion engine. ing. During normal operation of the internal combustion engine, the cooling water in the water jacket 20 is taken out from the cooling water outflow portion 32 in this way, but the cooling water inflow portion 31 and the cooling water outflow portion 32 of the water jacket 20 have a plurality of combustions. It is formed in the both ends of the cylinder head 1 in the linear direction which is the direction where the chamber 8 is arranged. Thereby, the cooling water flowing through the water jacket 20 of the cylinder head 1 flows along the plurality of combustion chambers 8. For this reason, when cooling water is taken out from the cooling water outflow portion 32, more cooling water flows through the combustion chamber water jacket 21.

  Therefore, the heat of the cooling water is easily exchanged with the combustion chamber 8, and the temperature of the combustion chamber 8 is cooled by the cooling water to lower the temperature, while the heat of the combustion chamber 8 is transmitted to the cooling water. The temperature rises. Thus, the cooling water whose temperature has been increased by exchanging heat with the combustion chamber 8 flows from the cooling water outflow portion 32 to the cooling water piping 45. The cooling water flowing from the cooling water outflow portion 32 to the cooling water pipe 45 passes through the switching valve 46 and then flows into the heater 41 from the heater inflow portion 42.

  In the heater 41 into which the cooling water whose temperature has risen flows, the cooling water is taken out from the outlet passage opening 27 during the warming-up operation, and this cooling water flows in the same manner as when the cooling water whose temperature has increased flows into the heater 41. Heat exchange between the vehicle and the air flowing into the vehicle interior. As a result, the temperature of the air rises, and the air having a higher temperature flows in the vehicle interior.

  In addition, the cooling water that has exchanged heat with the air flowing in the vehicle interior by the heater 41 in this way is lower in temperature by the amount of heat transferred to the air and compared with that before flowing into the heater 41. In this state, the temperature is lowered and flows out from the heater outflow portion 43 to the cooling water pipe 45. The cooling water that has flowed out of the heater 41 into the cooling water pipe 45 flows again through the cooling water pipe 45 from the cooling water inflow portion 31 of the cylinder head 1 into the water jacket 20 formed in the cylinder head 1.

  Thus, the water jacket 20 is formed so that the cooling water can be taken out from the take-out passage opening 27 located immediately downstream of the collecting portion 15 in the flow direction of the exhaust gas during the warm-up operation. . That is, the water jacket 20 is provided as an early heating fluid flow means formed so that the cooling water as the early heating fluid can be taken out immediately after flowing out of the collecting portion 15 during the warm-up operation.

  The cylinder head 1 described above is provided with the exhaust passage 10 in the cylinder head 1, the collecting portion 15 is formed in the exhaust passage 10, and the water jacket 20 which is an early heating fluid flow means is further provided. Of these, the collecting portion 15 of the exhaust passage 10 is a portion where the exhaust gas after the fuel is burned in the internal combustion engine gathers, so that the temperature tends to increase. The temperature is likely to be higher than that of the part. For this reason, the water jacket 20 is provided in the cylinder head 1, and the cooling water which is the early heating fluid immediately after flowing outside the collecting portion 15 is taken out during the warm-up operation, so that the heat immediately after the heat of the collecting portion 15 is transmitted. Cooling water can be taken out. Thereby, since the cooling water in the state where temperature became high can be taken out, the temperature of cooling water can be raised at the time of warming-up operation.

  Further, by taking out the cooling water immediately after flowing outside the collecting portion 15 during the warm-up operation, the cooling water is in a state other than immediately after flowing outside the collecting portion 15 during normal operation of the internal combustion engine, that is, cooling. Water is taken out in the state of passing through the vicinity of the combustion chamber 8 during normal operation of the internal combustion engine. For this reason, a problem caused by the fact that the cooling water immediately after flowing out of the collecting portion 15 continues to be taken out, that is, the cooling water immediately after flowing out of the collecting portion 15 during normal operation continues to be taken out. In addition, problems such as difficulty in cooling the combustion chamber 8 can be suppressed. As a result, it is possible to quickly raise the temperature of the cooling water, which is a fluid that is desired to rise in temperature early during the warm-up operation of the internal combustion engine, and to suppress problems during normal operation of the internal combustion engine.

  Further, the early heating fluid is cooling water that is a cooling medium used for cooling the internal combustion engine, and the water jacket 20 through which the cooling water flows is formed outside the collecting portion 15 of the exhaust passage 10. In addition, an outlet passage opening portion 27 that is an outlet during warm-up operation and a cooling water outflow portion 32 that is an outlet during normal operation are provided, thereby forming early heating fluid flow means. For this reason, the cooling water, which is a fluid whose temperature is desired to be raised early during the warm-up operation of the internal combustion engine, is taken out from the take-out passage opening 27 immediately after flowing outside the collecting portion 15 during the warm-up operation. Therefore, the temperature of the cooling water can be raised early during the warm-up operation.

  Further, it is during the warm-up operation that the cooling water immediately after flowing outside the collecting portion 15 is taken out. During normal operation, the cooling water other than immediately after flowing outside the collecting portion 15, that is, the combustion chamber 8. Since the cooling water that has flowed in the vicinity is taken out from the cooling water outflow portion 32, the cooling water can flow in the vicinity of the combustion chamber 8. Thereby, since the combustion chamber 8 can be cooled, it can suppress that it becomes difficult to cool the combustion chamber 8 because cooling water does not flow through the combustion chamber 8. That is, it is possible to suppress problems caused by taking out the cooling water immediately after flowing out of the collecting portion 15 during normal operation. As a result, it is possible to quickly raise the temperature of the cooling water, which is a fluid that is desired to rise in temperature early during the warm-up operation of the internal combustion engine, and to suppress problems during normal operation of the internal combustion engine.

  Further, the above heater piping structure 40 is connected to the cooling water piping 45 connecting the water jacket 20 of the cylinder head 1 and the heater 41 to the heater 41 from the water jacket 20 during the warm-up operation and the normal operation of the internal combustion engine. A switching valve 46 capable of switching the path of the flowing cooling water is connected. For this reason, during the warm-up operation, by switching the path of the cooling water flowing from the water jacket 20 to the heater 41 to the path flowing from the take-out passage opening 27 to the heater 41, the exhaust passage water jacket 25 is changed during the warm-up operation. The flowing cooling water, that is, the cooling water immediately after flowing outside the collecting portion 15 can be flowed from the outlet passage opening portion 27 to the heater 41. Thereby, the temperature of the cooling water can be raised at an early stage during the warm-up operation, and the cooling water whose temperature has been raised at an early stage can be passed through the heater.

  The path of the cooling water flowing from the water jacket 20 to the heater 41 is switched to the path flowing from the take-out passage opening 27 to the heater 41 during the warm-up operation, and during the normal operation of the internal combustion engine, the cooling water path Is switched to a path that flows from the cooling water outflow portion 32 to the heater 41. For this reason, during normal operation, cooling water can flow near the combustion chamber 8, and during normal operation, the cooling water immediately after flowing outside the collecting portion 15 is taken out from the extraction passage opening 27. Defects can be suppressed. As a result, it is possible to quickly raise the temperature of the cooling water, which is a fluid that is desired to rise in temperature early during the warm-up operation of the internal combustion engine, and to suppress problems during normal operation of the internal combustion engine.

  Further, during the warm-up operation of the internal combustion engine, the cooling water path is switched to a path that flows from the take-out passage opening 27 to the heater 41, so that the cooling water whose temperature has risen early can flow to the heater 41. Early warming can be performed. That is, even during the warm-up operation during the cold start of the internal combustion engine, the temperature in the vehicle compartment can be raised by the heater 41 at an early stage. As a result, it is possible to improve the warm-up performance by the heater 41 during the warm-up operation of the internal combustion engine.

  The cylinder head according to the second embodiment has substantially the same configuration as the cylinder head according to the first embodiment, but is characterized in that the early heating fluid flow means is an oil jet. Since other configurations are the same as those of the first embodiment, the description thereof is omitted and the same reference numerals are given. FIG. 4 is a plan view of a cylinder head according to the second embodiment of the present invention. 5 is a cross-sectional view taken along the line BB in FIG. The cylinder head 50 shown in the figure is provided with a plurality of combustion chambers 8 similar to the cylinder head 1 according to the first embodiment, and is further provided in the cylinder head 1 according to the first embodiment. Similarly to the exhaust passage 10, the exhaust passage 10 is provided. A water jacket 20 that is a cooling water passage for cooling the internal combustion engine during operation of the internal combustion engine is similar to the water jacket 20 provided in the cylinder head 1 according to the first embodiment, and the combustion chamber water jacket 21 and the exhaust passage water jacket. 25. Among these, the combustion chamber water jacket 21 has the same shape as the combustion chamber water jacket 21 of the cylinder head 1 according to the first embodiment, whereas the exhaust passage water jacket 25 is formed on the mounting surface 4 side of the exhaust passage 10. Are arranged only.

  In the cylinder head 50 according to the second embodiment, an oil passage 51 is formed as a passage for oil that is lubricating oil used for lubrication during operation of the internal combustion engine. The oil passage 51 is disposed closer to the cylinder head upper surface 3 than the exhaust passage 10. The oil passage 51 is connected to the oil passage 51 and is supplied or cut off by an electromagnetic valve 56 connected to an oil passage 55 formed in a portion other than the cylinder head 50 such as a cylinder block. It is provided so that it can be switched. The electromagnetic valve 56 is connected to an ECU that controls each part of the vehicle, and is provided so as to be controllable by the ECU.

  Further, one end portion of the oil passage 51 provided in this way is located near the upper surface 3 of the cylinder head in the vicinity of the collecting portion 15 of the exhaust passage 10. Further, the oil passage 51 is provided with an oil jet 52 capable of injecting oil flowing in the oil passage 51 at an end located near the upper surface 3 of the cylinder head in the vicinity of the collecting portion 15 of the exhaust passage 10. ing. The oil jet 52 is provided so that oil can be sprayed toward the collecting portion 15 of the exhaust passage 10 when the oil is supplied to the oil jet 52. The oil jet 52 is provided as an early heating fluid flow means formed so that oil can be sprayed toward the collecting portion 15 during the warm-up operation of the internal combustion engine.

  In addition, the viscosity of the oil increases as the temperature decreases, and the viscosity decreases as the temperature increases, but during operation of the internal combustion engine, the resistance during operation increases as the viscosity of the oil that lubricates each operating part increases. growing. For this reason, it is preferable that the temperature of the oil rises early when the internal combustion engine is warmed up. Therefore, the oil that lubricates each operating part of the internal combustion engine is an early heating fluid that is a fluid that is desired to rise in temperature early during the warm-up operation of the internal combustion engine among the fluids used during the operation of the internal combustion engine.

  The cylinder head 50 according to the second embodiment is configured as described above, and the operation thereof will be described below. When the internal combustion engine having the cylinder head 50 is operated, the exhaust gas flows from the combustion chamber 8 to the branch passage 11 of the exhaust passage 10 as in the operation of the internal combustion engine having the cylinder head 1 according to the first embodiment. 11 flows into the straight passage 12 and gathers at the collecting portion 15 of the straight passage 12. The exhaust gas collected at the collecting portion 15 further flows from the collecting portion 15 to the collecting passage 13, flows to the exhaust pipe connected to the cylinder head side surface 6, and is discharged from the exhaust passage 10 provided in the cylinder head 50.

  Further, during operation of the internal combustion engine, oil that lubricates each operating portion of the internal combustion engine circulates through the internal combustion engine. However, during warm-up operation of the internal combustion engine, the oil also flows through the oil passage 51 provided in the cylinder head 50. That is, at the time of warm-up operation, the solenoid valve 56 that can switch supply or shutoff of oil to the oil passage 51 provided in the cylinder head 50 is switched to supply oil to the oil passage 51.

  When oil is supplied to the oil passage 51 provided in the cylinder head 50, the oil jet 52 is provided in the oil passage 51, so that the oil supplied to the oil passage 51 is ejected from the oil jet 52. The direction of the injection is the direction of the collecting portion 15 of the exhaust passage 10, and therefore the oil jet 52 blows oil toward the collecting portion 15 during the warm-up operation of the internal combustion engine.

  When oil is sprayed from the oil jet 52 toward the collecting portion 15, the oil adheres to the outer wall forming the collecting portion 15, and this collecting portion 15 is a portion where exhaust gases flowing through the plurality of branch passages 11 gather. Therefore, the temperature is likely to rise even during warm-up operation. For this reason, when oil adheres to the outer wall which forms the collection part 15, the heat of exhaust gas or the heat of the collection part 15 is transmitted to oil, and the temperature of oil rises. The oil whose temperature has risen flows into an oil pan (not shown) located at the lower part of the internal combustion engine and is stored in the oil pan. For this reason, the temperature of the whole oil stored in the oil pan rises.

  The oil stored in the oil pan circulates in the internal combustion engine in a state where the temperature is increased and lubricates each operating portion. However, the viscosity of the oil decreases as the temperature increases. Therefore, by lubricating each operating part with this oil, resistance due to oil during operation of the internal combustion engine is reduced, and friction loss is reduced.

  Further, when the temperature of the cooling water rises to a predetermined temperature by continuing the warm-up operation, the operation of the internal combustion engine is switched to the normal operation. When the internal combustion engine is in normal operation, the oil is not supplied to the oil passage 51 provided in the cylinder head 50 by switching the electromagnetic valve 56. For this reason, the oil is not ejected from the oil jet 52 provided in the oil passage 51, and the oil is not sprayed to the collecting portion 15.

  Since the collecting portion 15 of the exhaust passage 10 is a portion where exhaust gas flowing through the plurality of branch passages 11 gathers, the temperature tends to be high, and the temperature of the collecting portion 15 during normal operation is set during warm-up operation. Although the temperature is higher than the temperature of the portion 15, since oil is not sprayed to the collecting portion 15 during normal operation, the heat of the exhaust gas is hardly transmitted to the oil, and the temperature is not easily raised. As a result, the oil is difficult to oxidize and the deterioration of the oil is suppressed.

  Thus, the oil jet 52 can collect oil in the oil pan during the warm-up operation by spraying the oil toward the collecting portion 15 of the exhaust passage 10 during the warm-up operation. It can be taken out immediately after flowing out of the collecting portion 15.

  In the above cylinder head 50, the early heating fluid is oil used for lubrication during operation of the internal combustion engine, and the oil jet 52, which is the early heating fluid flow means, removes oil from the exhaust passage 10 during warm-up operation of the internal combustion engine. It can be sprayed toward the collective portion 15. For this reason, oil that is a fluid whose temperature is desired to be raised early during the warm-up operation of the internal combustion engine is blown toward the collecting portion 15 during the warm-up operation, and immediately after flowing outside the collecting portion 15. Oil can be taken out. As a result, heat can be exchanged with the high-temperature exhaust gas flowing through the collecting portion 15 and the oil immediately after the temperature becomes high can be taken out, so that the temperature of the oil can be raised early during the warm-up operation.

  Further, the oil is blown toward the collecting portion 15 of the exhaust passage 10 during the warm-up operation, and the oil is circulated without being blown toward the collecting portion 15 during the normal operation. For this reason, the malfunction resulting from oil flowing out of the gathering part 15 can be suppressed during normal operation. That is, during normal operation, the temperature of the collecting portion 15 is higher than during warm-up operation, but during normal operation, oil is not sprayed onto the collecting portion 15, so that oil continues to flow out of the collecting portion 15. It can be suppressed that the temperature of the oil rises and the oil easily deteriorates. As a result, it is possible to quickly raise the temperature of oil, which is a fluid that is desired to rise in temperature early during the warm-up operation of the internal combustion engine, and to suppress problems during normal operation of the internal combustion engine.

  FIG. 6 is a plan view illustrating a modification of the cylinder head according to the first embodiment. 7 is a cross-sectional view taken along the line CC of FIG. In addition, although the cylinder head mentioned above does not prescribe | regulate the shape inside the exhaust passage 10 in particular, you may prescribe | regulate the shape inside the exhaust passage 10. FIG. For example, as shown in FIGS. 6 and 7, the exhaust passage 61 may be provided with a protrusion inside a straight passage 62 that is a connection passage. Specifically, the linear passage 62 protrudes inward from the inner wall of the linear passage 62 and faces the circumferential direction while facing the axial direction of the linear passage 62 formed in a substantially cylindrical shape. Alternatively, the protrusion 63, which is a protrusion formed in a spiral shape, may be formed. In the cylinder head 60 shown in FIGS. 6 and 7, the protrusions 63 formed in a spiral shape have four protrusions 63 in the circumferential direction of the substantially cylindrical shape that is the shape of the linear passage 62. They are offset by about 90 °.

  Further, the exhaust passage 61 is exhaust gas component detection means capable of detecting the exhaust gas component in the collecting passage 13 located downstream of the collecting portion 15 in the flow direction of the exhaust gas flowing through the exhaust passage 61. An air-fuel ratio sensor 65 is provided.

  Thus, the straight passage 62 is provided in the exhaust passage 61, and the projection 63 formed in a spiral shape is formed in the straight passage 62, so that when the exhaust gas flows into the straight passage 62, a spiral shape is formed. The exhaust gas can be rectified by the protrusion 63 formed on the surface. Further, since the air-fuel ratio sensor 65 is provided in the collecting passage 13 located downstream of the collecting portion 15 included in the straight passage 62, the air-fuel ratio sensor 65 is formed by a spiral protrusion formed in the straight passage 62. The component of the exhaust gas after being rectified by the unit 63 can be detected. Therefore, variation when the air-fuel ratio sensor 65 detects the exhaust gas component can be suppressed. As a result, the exhaust gas component can be detected with high accuracy.

  In addition, when providing the projection part 63 in the linear channel | path 62, the number of the projection parts 63 may be other than four. In addition, when the exhaust gas flowing through the straight passage 62 is rectified in this way, a part other than the protrusion 63 may be provided and rectified. For example, the exhaust gas may be rectified by forming a spiral groove in the straight passage 62. Even when a spiral groove is formed in the straight passage 62, the exhaust gas flowing through the straight passage 62 can be rectified. That is, it is sufficient that at least one of a spirally formed groove or protrusion is formed in the linear passage 62. By forming at least one of a spirally formed groove or protrusion in the straight passage 62, the exhaust gas flowing through the straight passage 62 is rectified by the spiral groove or protrusion. Thus, when the exhaust gas component is detected, the exhaust gas component can be accurately detected.

  Further, in the cylinder head 50 according to the second embodiment, only one oil jet 52 is provided on the cylinder head upper surface 3 side of the collecting portion 15 of the exhaust passage 10. , Other than this. The oil jet 52 is not limited in its position and number as long as it can spray oil toward the outside of the collecting portion during the warm-up operation of the internal combustion engine.

  In the cylinder head 50 according to the second embodiment, oil injection by the oil jet 52 is controlled by an electromagnetic valve 56 connected to an oil passage 55 formed in a portion other than the cylinder head 50. The oil injection by 52 may be controlled by other means. For example, the solenoid valve 56 may be provided in the oil passage 51 formed in the cylinder head 50 or may be provided in the vicinity of the oil jet 52 to directly control whether oil is supplied to the oil jet 52. . Alternatively, a thermostat or a bimetal may be provided on the oil path or the cooling water path to automatically control whether the oil is supplied to the oil jet 52 according to the temperature of the oil or the cooling water. The control of the injection of the oil jet 52 is not limited as long as it is provided so that oil can be injected during the warm-up operation of the internal combustion engine.

  In the cylinder head 1 according to the first embodiment, the early heating fluid is cooling water that cools the internal combustion engine during operation of the internal combustion engine. In the cylinder head 50 according to the second embodiment, the early heating fluid is the internal combustion engine. Although the oil is used to lubricate each operating part during operation, the early heating fluid may be other than these. The early heating fluid may be, for example, fuel for an internal combustion engine or air that is taken into a cylinder when the fuel is burned. Since the fuel has low volatility when the temperature is low, it is preferable that the temperature of the fuel is raised early during the warm-up operation during the cold start of the internal combustion engine. Further, since the ignitability is lowered when the temperature of the air is low, it is preferable that the temperature of the air is raised early during the warm-up operation during the cold start of the internal combustion engine.

  When the fuel is caused to flow out of the collecting portion 15 of the exhaust passage 10 during the warm-up operation as the early heating fluid and the temperature of the fuel during the warm-up operation is increased, the volatility of the fuel during the warm-up operation can be ensured. . Thereby, fuel and air can be mixed more reliably during the warm-up operation. In addition, when air is warmed as an early heating fluid and flows outside the collecting portion 15 of the exhaust passage 10 during the warm-up operation, and the temperature of the air during the warm-up operation is increased, the ignitability of the air-fuel mixture during the warm-up operation is secured. be able to. Thereby, fuel can be burned more reliably during warm-up operation. As described above, the early heating fluid may be a fluid other than cooling water and oil as long as it is a fluid that is desired to rise in temperature early during the warm-up operation of the internal combustion engine among the fluids used during the operation of the internal combustion engine.

  Further, in the cylinder heads 1 and 50 described above, all the branch passages 11 connected to the combustion chambers 8 formed in the cylinder heads 1 and 50 are gathered in one gathering part 15, but the gathering part 15 is A plurality may be provided. That is, the plurality of branch passages 11 connected to the combustion chambers 8 formed in the cylinder heads 1 and 50 are not all gathered in one collecting portion 15 but one of the plurality of branch passages. A plurality of the branch passages 11 of the part gathered in one gathering part 15 may be regarded as one set, and a plurality of such sets may be formed. The exhaust passage 10 is provided so that the early heating fluid flow means such as the water jacket 20 can flow the early heating fluid such as cooling water out of the collecting portion 15 of the exhaust passage 10 during the warm-up operation of the internal combustion engine. If it does, the form will not ask | require.

  As described above, the cylinder head and heater piping structure according to the present invention is useful for an internal combustion engine in which the exhaust passage is formed in the cylinder head, and is particularly suitable when the exhaust passages are gathered.

It is a top view of the cylinder head concerning Example 1 of the present invention. It is AA sectional drawing of FIG. It is the schematic of the heater piping structure provided with the cylinder head shown in FIG. It is a top view of the cylinder head concerning Example 2 of the present invention. It is BB sectional drawing of FIG. FIG. 6 is a plan view illustrating a modification of the cylinder head according to the first embodiment. It is CC sectional drawing of FIG.

Explanation of symbols

1, 50, 60 Cylinder head 3 Cylinder head upper surface 4 Mounting surface 6 Cylinder head side surface 8 Combustion chamber 10, 61 Exhaust passage 11 Branch passage 12, 62 Linear passage 13 Collective passage 15 Collecting portion 18 Through hole 20 Water jacket 21 Combustion chamber water Jacket 25 Exhaust passage water jacket 26 Take-out passage 27 Take-out passage opening 31 Cooling water inflow portion 32 Cooling water outflow portion 40 Heater piping structure 41 Heater 42 Heater inflow portion 43 Heater outflow portion 45 Cooling water piping 46 Switching valve 51 Oil passage 52 Oil Jet 55 Oil passage 56 Solenoid valve 63 Projection 65 Air-fuel ratio sensor

Claims (3)

A plurality of branch passages provided as a passage through which exhaust gas of the internal combustion engine flows, and a plurality of branch passages connected to combustion chambers of a plurality of cylinders of the internal combustion engine, and a collective portion formed by collecting the plurality of branch passages An exhaust passage having
Immediately after flowing the early heating fluid, which is the fluid that is desired to rise in temperature at the time of warming-up operation of the internal combustion engine, out of the collecting portion during the warming-up operation, among the fluids used during the operation of the internal combustion engine. Early heating fluid flow means that can be removed;
Equipped with a,
The early heating fluid is a cooling medium used for cooling the internal combustion engine,
The early heating fluid flow means has a part of a cooling medium passage provided as a passage for the cooling medium formed outside the collecting portion, and is provided in the vicinity of the exhaust passage in the cooling medium passage. An exhaust passage water jacket, which is a portion formed outside the collecting portion, is an outlet for the cooling medium from the exhaust passage water jacket, and is an outlet for the cooling medium during warm-up operation of the internal combustion engine And a cooling medium outlet from the combustion chamber water jacket, which is the cooling medium passage formed by avoiding the exhaust passage in the vicinity of the combustion chamber of the cooling medium passage. And an outlet for normal operation that is an outlet for taking out the cooling medium during normal operation of the internal combustion engine. ,
The outlet during the warm-up operation is located immediately after the downstream side of the collecting portion in the exhaust gas flow direction, so that the cooling medium can be taken out immediately after flowing out of the collecting portion. Tei cylinder head, characterized in Rukoto. The exhaust passage is connected to the plurality of branch passages and is provided with a connection passage having the collecting portion.
The connection passage is formed with at least one of a spirally formed groove or projection,
Further, according to claim 1 wherein the downstream side of the collecting portion in the flow direction of the exhaust gas flowing through the exhaust passage, characterized in that the component of the exhaust gas is detectable exhaust gas component detection means is provided Cylinder head as described in A cylinder head according to claim 1 ;
A heater capable of raising the temperature of the air by causing heat exchange between the cooling medium and air;
A cooling medium pipe connecting the cooling medium passage provided in the cylinder head and the heater;
The cooling medium path connected to the cooling medium pipe and flowing from the cooling medium passage to the heater is switched to a path flowing from the early heating outlet to the heater during the warm-up operation of the internal combustion engine, A switching means capable of switching from the normal operation outlet to the heater during normal operation of the internal combustion engine;
A heater piping structure comprising:

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