JP2007032306A - Cooling device for hollow intake and exhaust valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling device for a hollow intake and exhaust valve capable of inhibiting thermal deterioration of an oil seal. <P>SOLUTION: The oil seal 30 is contacted on a shaft part 15 of the exhaust valve 5 which is an example of the hollow intake and exhaust valve, and a valve guide 20 is provided around a shaft part 15 between a part in contact with the oil seal 30 and an umbrella part 10 of the exhaust valve 5 in the shaft part 15. Moreover, an oil jet nozzle 45 is provided on a cylinder head 40, and oil 48 is sprayed on a valve guide 20 by the oil jet nozzle 45 during operation of the internal combustion engine. Consequently, heat conducted to the shaft part 15 via the umbrella part 10 and a heat conduction medium 18 in a hollow part 16 from a combustion chamber is easily released to the valve guide 20 since temperature of the valve guide 20 is decreased. Temperature rise of the shaft part 15 can be inhibited and temperature rise of the oil seal 30 can be inhibited. As a result, thermal deterioration of the oil seal 30 can be inhibited. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hollow intake / exhaust valve cooling device. In particular, the present invention relates to a hollow intake / exhaust valve cooling device in which a heat conduction medium is enclosed inside a hollow intake / exhaust valve.

  An intake / exhaust valve of an internal combustion engine mounted on a vehicle has an umbrella part and a shaft part. Of these, the umbrella part faces the combustion chamber, so that when fuel burns in the combustion chamber, Heat generated by combustion is easily transmitted. In particular, internal combustion engines mounted on vehicles in recent years often have a high output, and when such a high output is achieved, a large amount of heat is generated in the combustion chamber. There is also a lot of heat transmitted to the umbrella. Therefore, some conventional intake / exhaust valves make it easy to release heat transmitted to the umbrella.

  For example, in Patent Document 1, a hollow portion is provided in an intake / exhaust valve, and a green compact serving as a heat conduction medium is enclosed in the hollow portion. During the operation of the internal combustion engine, the intake / exhaust valve reciprocates. By thus enclosing the heat conduction medium in the hollow portion formed in the hollow intake / exhaust valve, the heat conduction medium is reciprocated by the intake / exhaust valve. Along with this, it reciprocates in the hollow portion. As a result, the heat received by the umbrella from the combustion chamber during operation of the internal combustion engine is transferred to the heat transfer medium, and the heat transferred to the heat transfer medium is transferred to the shaft portion by the reciprocating motion of the heat transfer medium in the hollow portion. It is done. Thereby, the heat transmitted to the umbrella part can be released, and the temperature of the umbrella part can be prevented from rising excessively.

Japanese Patent Laid-Open No. 5-113113

  However, when the output of the internal combustion engine is further improved and the amount of heat generated in the combustion chamber during operation of the internal combustion engine further increases, it is transmitted from the umbrella portion to the shaft portion by the heat conduction medium according to the amount of heat generated. There is a possibility that the amount of heat increases and the temperature of the shaft portion becomes too high. The shaft is in contact with an oil seal that prevents oil flowing in the cylinder head from flowing into the combustion chamber through the internal combustion engine valve. The oil seal is made of a rubber-based material. Because it is vulnerable to heat. For this reason, when heat is applied to the oil seal, the material forming the oil seal may deteriorate and the sealing performance may be reduced.

  This invention is made | formed in view of the above, Comprising: It aims at providing the hollow intake / exhaust valve cooling device which can suppress the thermal deterioration of an oil seal.

  In order to solve the above-described problems and achieve the object, a hollow intake / exhaust valve cooling device according to the present invention is provided in an internal combustion engine and has an umbrella portion at one end of a shaft portion, and the shaft portion and the umbrella. A hollow part is formed inside the part, and a hollow intake / exhaust valve in which a heat conduction medium is enclosed in the hollow part, an oil seal in contact with the shaft part, and the shaft part are slidably supported. And a valve guide located between the portion of the shaft portion that contacts the oil seal and the umbrella portion, and a refrigerant supply means for supplying a refrigerant that exchanges heat with the valve guide. It is characterized by that.

  In the present invention, there is provided refrigerant supply means for supplying a refrigerant that exchanges heat with a valve guide that slidably supports a shaft portion of the hollow intake / exhaust valve. In addition, the heat transmitted from the combustion chamber to the umbrella portion of the intake / exhaust valve during operation of the internal combustion engine is transmitted from the umbrella portion to the shaft portion through the heat conduction medium sealed in the hollow portion, and the heat transmitted to the shaft portion is , Transmitted to the valve guide that supports the shaft. For this reason, when the refrigerant is supplied by the refrigerant supply means and heat is exchanged between the refrigerant and the valve guide to lower the temperature of the valve guide, the heat of the shaft portion is easily transmitted to the valve guide. Temperature rise can be suppressed. The valve guide is located between the portion of the shaft portion that contacts the oil seal and the umbrella portion. For this reason, the heat transferred from the combustion chamber of the internal combustion engine to the umbrella portion is transferred to the valve guide before reaching the oil seal through the shaft portion, and therefore the temperature of the shaft portion in contact with the oil seal. The rise is suppressed. As a result, the heat transmitted from the combustion chamber to the umbrella portion is not easily transmitted to the oil seal. As a result, thermal deterioration of the oil seal can be suppressed.

  In the hollow intake / exhaust valve cooling device according to the present invention, the refrigerant supply means injects the refrigerant into the valve guide.

  In the present invention, the refrigerant is supplied to the valve guide by injecting the refrigerant. Thereby, since a refrigerant | coolant can be directly supplied to a valve guide, the heat dissipation effect from a valve guide to a refrigerant | coolant can be improved. Accordingly, heat exchange can be performed more reliably between the refrigerant and the valve guide, and the temperature of the valve guide can be lowered more reliably. Accordingly, the temperature rise of the shaft portion can be more reliably suppressed. be able to. As a result, thermal deterioration of the oil seal can be suppressed more reliably.

  The hollow intake / exhaust valve cooling device according to the present invention is characterized in that the refrigerant supply means has at least a part provided in the vicinity of the valve guide and a refrigerant passage through which the refrigerant passes. To do.

  In the present invention, since the refrigerant passage provided at least partially near the valve guide is provided, the refrigerant can be circulated in the refrigerant passage and supplied to the vicinity of the valve guide. Thus, when a plurality of hollow intake and exhaust valves are provided in the internal combustion engine, the refrigerant can be efficiently supplied to the vicinity of the valve guide by providing the refrigerant passage so as to circulate in the vicinity of the plurality of valve guides. . As a result, the heat of the plurality of valve guides can be efficiently dissipated, and therefore thermal deterioration of the oil seal can be more reliably suppressed.

  In the hollow intake / exhaust valve cooling device according to the present invention, the refrigerant passage has a groove formed on an outer peripheral surface of the valve guide.

  In the present invention, since the refrigerant passage has a groove formed in the outer peripheral surface of the valve guide, the refrigerant can be brought into direct contact with the valve guide. Thereby, the heat | fever of a valve guide can be thermally radiated more reliably with respect to a refrigerant | coolant. Further, similarly to the above, the refrigerant can be efficiently supplied to the plurality of valve guides. As a result, the heat of the plurality of valve guides can be radiated efficiently, and the thermal deterioration of the oil seal can be more reliably suppressed.

  The hollow intake / exhaust valve cooling device according to the present invention is characterized in that the refrigerant passage has a groove formed to open to the valve guide.

  In the present invention, since the refrigerant passage has a groove formed so as to open to the valve guide, the refrigerant can be brought into direct contact with the valve guide. Thereby, the heat of the valve guide can be radiated more reliably to the refrigerant, and the refrigerant can be efficiently supplied to the plurality of valve guides as described above. As a result, the heat of the plurality of valve guides can be radiated efficiently, and the thermal deterioration of the oil seal can be more reliably suppressed.

  In the hollow intake / exhaust valve cooling device according to the present invention, the internal combustion engine is mounted on a vehicle, and the vehicle includes air introduced into a vehicle interior of the vehicle and cooling water for cooling the internal combustion engine. A vehicle compartment heater that exchanges heat with the valve guide is provided, and the refrigerant after exchanging heat with the valve guide exchanges heat with the cooling water that flows toward the vehicle compartment heater. It is characterized by.

  As an example of the refrigerant that exchanges heat with the valve guide, when oil that circulates in the internal combustion engine is used, the present invention will be described. In the present invention, the oil and cooling that flows toward the vehicle compartment heater are described. Since heat is exchanged with water, the heat of the oil whose temperature has risen due to the transfer of the heat of the valve guide can be radiated to the cooling water. Since oil receives heat from the valve guide, it is better to dissipate heat at parts other than the valve guide, and the cooling water flowing toward the vehicle compartment heater has been raised to increase the temperature of the vehicle compartment. Better. Therefore, by exchanging heat between them, the heat received by the hollow intake / exhaust valve from the combustion chamber can be used as heat for the vehicle compartment heater, and the temperature of the oil can be lowered. The temperature rise of the shaft portion of the hollow intake / exhaust valve can be more reliably suppressed via the guide. As a result, it is possible to easily raise the temperature of the passenger compartment with the passenger compartment heater, and more reliably suppress the thermal deterioration of the oil seal.

  The hollow intake / exhaust valve cooling device according to the present invention is characterized in that the refrigerant uses oil circulating in the internal combustion engine.

  In the present invention, since the oil circulating in the internal combustion engine is used as the refrigerant, there is no need to form an independent refrigerant path, and the valve guide cooling path is added from the oil path. The valve guide can be cooled. As a result, thermal deterioration of the oil seal can be easily suppressed.

  The hollow intake / exhaust valve cooling device according to the present invention has an effect that thermal deterioration of the oil seal can be suppressed.

  Embodiments of a hollow intake / exhaust valve cooling device 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. The hollow intake / exhaust valve of the hollow intake / exhaust valve cooling apparatus according to the present invention includes an intake valve and an exhaust valve. In the following description, a hollow intake / exhaust valve having an exhaust valve as an example of the hollow intake / exhaust valve The cooling device will be described.

  FIG. 1 is a schematic view showing a hollow intake / exhaust valve cooling device according to a first embodiment of the present invention. A hollow intake / exhaust valve cooling device 1 shown in the figure includes an exhaust valve 5 serving as a hollow intake / exhaust valve, a valve guide 20, and an oil seal 30. Further, a refrigerant supply is provided in the vicinity of the valve guide 20. An oil jet nozzle 45 serving as a means is provided. The hollow intake / exhaust valve cooling device 1 is provided to open and close an exhaust passage (not shown) formed in the cylinder head 40 when the exhaust valve 5 reciprocates. FIG. 1 shows the hollow intake / exhaust valve cooling device 1 in a state where the exhaust valve 5 closes the exhaust passage.

  The exhaust valve 5 has an umbrella part 10 and a shaft part 15. The umbrella portion 10 is formed in a shape close to a conical shape, and the bottom surface of the conical shape is formed as a valve surface 11. The valve surface 11 faces a combustion chamber (not shown) of an internal combustion engine (not shown) provided with the hollow intake / exhaust valve cooling device 1. The shaft portion 15 is located on the slope 12 side of the umbrella portion 10, one end portion of the shaft portion 15 is connected to the conical top portion, and the axial direction is parallel to the conical height direction. It is formed in the direction that becomes the direction.

  In the shaft portion 15 and the umbrella portion 10, a continuous cavity is formed, and this cavity is a hollow portion 16. The hollow portion 16 is sealed with a heat conducting medium 18 made of, for example, sodium. This heat conducting medium 18 is in a liquid state at least during operation of the internal combustion engine.

  The valve guide 20 is fixed to the cylinder head 40. The valve guide 20 has a substantially cylindrical shape and is provided around the shaft portion 15. The diameter of the inner hole of the cylindrical shape that is the shape of the valve guide 20 is approximately the same as the diameter of the shaft portion 15, and the shaft portion 15 is inserted through this hole. For this reason, this hole serves as the valve guide contact portion 21 and is in contact with the shaft portion 15. Further, in this way, the valve guide contact portion 21 is formed in the shape of a hole having a diameter approximately the same as the diameter of the shaft portion 15, and the shaft portion 15 is inserted through the valve guide contact portion 21. The valve guide 20 restricts movement in directions other than the axial direction. That is, the shaft portion 15 is slidably supported by the valve guide 20.

  The oil seal 30 is a stationary part fixed to the cylinder head 40, and the oil seal 30 is an oil seal at an end of the shaft portion 15 opposite to the umbrella portion side end portion 15a that is an end portion on the umbrella portion 10 side. It contacts the vicinity of the side end 15b. The oil seal 30 is formed with a hole having substantially the same diameter as the shaft 15, and the shaft 15 is inserted through the hole. For this reason, the hole serves as the oil seal contact portion 31 and is in contact with the shaft portion 15. In addition, since the oil seal contact portion 31 is formed with a hole having a diameter approximately the same as the diameter of the shaft portion 15 as described above, the oil seal contact portion 31 has a predetermined width in the entire circumferential direction of the shaft portion 15. There is contact over the circumference. Further, since the oil seal 30 is made of a rubber-based material and has elasticity, the oil seal contact portion 31 is in contact with the shaft portion 15 with almost no gap. . Thereby, since the gap between the oil seal 30 and the shaft portion 15 can be sealed, the oil flowing in the cylinder head 40 is suppressed from flowing between the shaft portion 15 and the valve guide 20. Flow along the exhaust valve 5 in the direction of the combustion chamber is suppressed.

  The valve guide 20 is exposed from a portion of the cylinder head 40 where the valve guide 20 is fixed. The oil jet nozzle 45 is provided in the vicinity of the valve guide 20 exposed from the cylinder head 40. ing. The oil jet nozzle 45 is formed so that oil 48 circulating in the internal combustion engine can be injected as a refrigerant to the valve guide 20 exposed from the cylinder head 40.

  The hollow intake / exhaust valve cooling device 1 according to the first embodiment is configured as described above, and the operation thereof will be described below. When the internal combustion engine provided with the hollow intake / exhaust valve cooling device 1 is operated, the valve surface 11 facing the combustion chamber of the internal combustion engine receives heat from combustion as fuel burns in the combustion chamber. . A part of the heat received by the valve surface 11 is transferred to the heat conducting medium 18 enclosed in the hollow portion 16.

  FIG. 2 is a diagram illustrating a state where the exhaust valve of FIG. 1 has moved. The exhaust valve 5 is provided so as to open and close the exhaust passage when the internal combustion engine is operated. The exhaust passage is opened and closed by operating the exhaust valve 5 in the axial direction of the shaft portion 15. When the exhaust valve 5 moves in the direction in which the oil seal 30 is provided (see FIG. 1), the exhaust passage is closed, and when the exhaust valve 5 moves in the direction of the umbrella 10 (see FIG. 2), the exhaust passage opens. It is. During operation of the internal combustion engine, the exhaust valve 5 reciprocates in the axial direction of the shaft portion 15 as described above. However, when the exhaust valve 5 reciprocates, the heat conduction medium 18 positioned in the hollow portion 16 is caused by inertia. It moves in the hollow portion 16 with a movement different from the movement of the exhaust valve 5. The temperature of the heat conducting medium 18 is increased by the heat from the valve surface 11 of the umbrella part 10, but when the heat conducting medium 18 moves in the hollow part 16, the heat of the heat conducting medium 18 is changed to the shaft part. 15 told. At that time, since the heat conduction medium 18 moves while transferring heat to the shaft portion 15 when the heat conduction medium 18 moves from the direction of the umbrella portion 10 toward the oil seal side end portion 15b, the umbrella portion in the shaft portion 15 is moved. The temperature increases from the side end portion 15a side.

  Thus, the valve guide 20 is in contact with the shaft portion 15 whose temperature has been increased. For this reason, the heat of the shaft portion 15 is transmitted to the valve guide 20 through the valve guide contact portion 21, whereby a part of the heat of the shaft portion 15 is radiated to the valve guide 20. Further, oil 48 is sprayed onto the valve guide 20 by an oil jet nozzle 45. For this reason, the heat of the valve guide 20 is transmitted to the oil 48 sprayed by the oil jet nozzle 45, and the temperature of the valve guide 20 decreases. On the other hand, the oil 48 sprayed to the valve guide 20 by the oil jet nozzle 45 and the heat of the valve guide 20 is transferred, like the other oils that lubricate the operating portion provided in the cylinder head 40, circulates the oil. It circulates in the internal combustion engine through a path (not shown).

  An oil seal 30 is in contact with the vicinity of the oil seal side end portion 15b of the shaft portion 15. The oil seal 30 is fixed to the cylinder head 40 as a stationary component. For this reason, when the exhaust valve 5 reciprocates during operation of the internal combustion engine, the exhaust valve 5 comes into contact with the oil seal 30 so as to slide. The oil seal 30 is always in contact with the shaft portion 15 regardless of whether the exhaust valve 5 closes the exhaust passage (see FIG. 1) or opens (see FIG. 2).

  In addition, the valve guide 20 is located between the oil seal side end 15b and the umbrella side end 15a, which is the end on the side where the oil seal 30 is in contact, in the shaft portion. The shaft portion 15 is in contact with the portion between the oil seal side end portion 15b and the umbrella portion side end portion 15a. The temperature of the shaft portion 15 of the exhaust valve 5 during operation of the internal combustion engine increases from the umbrella portion 10 side, but in the portion between the umbrella portion side end portion 15a and the oil seal side end portion 15b of the shaft portion 15. The valve guide 20 is radiating heat. For this reason, the heat received by the valve surface 11 during the combustion of the fuel is radiated from the umbrella portion side end portion 15a to the oil seal side end portion 15b, and is hardly transmitted to the oil seal side end portion 15b. For this reason, the heat generated during the combustion of the fuel is difficult to be transmitted to the oil seal 30 via the shaft portion 15.

  In the hollow intake / exhaust valve cooling device 1 described above, an oil jet nozzle 45 that supplies oil 48 serving as a refrigerant is provided in a valve guide 20 provided around a shaft portion 15 of the exhaust valve 5. Further, heat transmitted from the combustion chamber to the umbrella portion 10 of the exhaust valve 5 during operation of the internal combustion engine is transmitted from the umbrella portion 10 to the shaft portion 15 via the heat conduction medium 18 sealed in the hollow portion 16, and the shaft portion 15. The heat transmitted to is transmitted to the valve guide 20 in contact with the shaft portion 15. For this reason, the oil 48 is supplied to the valve guide 20 by the oil jet nozzle 45 to exchange heat between the oil 48 and the valve guide 20, and the temperature of the valve guide 20 is lowered. It becomes easy to be transmitted to the guide 20. Thereby, the temperature rise of the axial part 15 can be suppressed. Further, the valve guide 20 is located in the vicinity of the oil seal side end portion 15b, that is, between the portion of the shaft portion 15 that contacts the oil seal 30 and the umbrella portion 10, and the periphery of the shaft portion 15 positioned in this portion. The shaft portion 15 is slidably supported. For this reason, the heat transmitted from the combustion chamber of the internal combustion engine to the umbrella portion 10 is transmitted to the valve guide 20 before reaching the oil seal 30 through the shaft portion 15, and therefore the portion in contact with the oil seal 30. The temperature rise of the shaft portion 15 is suppressed. Thereby, the heat transmitted from the combustion chamber to the umbrella portion 10 is difficult to be transmitted to the oil seal 30. As a result, thermal deterioration of the oil seal 30 can be suppressed.

  An oil jet nozzle 45 is provided in the vicinity of the valve guide 20, and oil 48 is sprayed from the oil jet nozzle 45 and sprayed onto the valve guide 20. Thereby, the oil 48 used as a refrigerant | coolant can be directly supplied to the valve guide 20, and the heat dissipation effect from the valve guide 20 to the oil 48 can be improved. Therefore, since the temperature of the valve guide 20 can be lowered more reliably, the temperature of the shaft portion 15 is also easily transmitted to the valve guide 20, and the temperature rise of the shaft portion 15 can be more reliably suppressed. As a result, thermal deterioration of the oil seal 30 can be suppressed more reliably.

  Further, since oil 48 circulating in the internal combustion engine is used as a cooling refrigerant for the valve guide 20, it is not necessary to prepare a new cooling refrigerant for the valve guide 20, and a route through which the new refrigerant passes is provided. There is no need to provide a new one independently. That is, the valve guide 20 can be cooled by adding a cooling path for the valve guide 20 to the path for the oil 48 without providing a new refrigerant path independently. As a result, thermal deterioration of the oil seal 30 can be easily suppressed.

  The hollow intake / exhaust valve cooling device according to the second embodiment has substantially the same configuration as the hollow intake / exhaust valve cooling device according to the first embodiment, but an oil passage is provided in the vicinity of the valve guide without providing an oil jet nozzle. There is a feature in that. 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. 3 is a schematic view showing a hollow intake / exhaust valve cooling device according to Embodiment 2 of the present invention. In the hollow intake / exhaust valve cooling device 50 shown in the figure, an oil passage 51, which is a refrigerant passage through which oil 52 circulates in the internal combustion engine, passes in the shape of a hole-like passage in the vicinity of the valve guide 20 of the cylinder head 40. Is formed. The oil passage 51 is formed as a part of the refrigerant supply means, and is formed around the valve guide 20 in the state of being separated from the valve guide 20 in the vicinity of the valve guide 20 of the cylinder head 40. That is, the oil passage 51 is formed around the valve guide 20 in a state of being close to the valve guide 20. Further, an internal combustion engine having a plurality of cylinders (not shown) is provided with a plurality of exhaust valves 5, but an oil passage 51 is provided for each valve provided around the shaft portion 15 of the plurality of exhaust valves 5. It is provided in the vicinity of the guide 20. Further, the oil passages 51 provided in the vicinity of each valve guide 20 are all formed continuously. That is, all the oil passages 51 provided in the vicinity of each valve guide 20 are in communication.

  The hollow intake / exhaust valve cooling device 50 according to the second embodiment is configured as described above, and the operation thereof will be described below. When the internal combustion engine provided with the hollow intake / exhaust valve cooling device 50 is operated, an oil pump (not shown) of the internal combustion engine is operated so that the oil 52 described above circulates in the internal combustion engine. When the oil pump is operated, the oil 52 circulates in the internal combustion engine. The oil 52 is also supplied into the oil passage 51 formed in the vicinity of the valve guide 20 and flows through the oil passage 51. Since the oil passage 51 is close to the valve guide 20, heat exchange is performed with the oil 52 flowing in the oil passage 51. That is, during operation of the internal combustion engine, the umbrella portion 10 of the exhaust valve 5 receives heat from combustion of the fuel from the combustion chamber, and the heat received by the umbrella portion 10 is transmitted to the shaft portion 15.

  Although the oil seal 30 is in contact with the vicinity of the oil seal side end 15b of the shaft portion 15, most of the heat transmitted from the umbrella portion 10 is transmitted to the oil seal side end portion 15b of the shaft portion 15. In the meantime, it is located between the umbrella part side end part 15a and the oil seal side end part 15b, and is transmitted to the valve guide 20 that contacts the shaft part 15 at this part. Thus, the heat of the umbrella portion 10 of the exhaust valve 5 received from the combustion chamber during operation of the internal combustion engine and further transmitted to the shaft portion 15 of the exhaust valve 5 is transferred to the oil 52 in the oil passage 51 via the valve guide 20. Reportedly. The oil passage 51 is formed in the vicinity of each valve guide 20 provided around the shaft portion 15 of the plurality of exhaust valves 5, and the oil passage 51 formed in the vicinity of each valve guide 20 communicates with the oil passage. The oil 52 flowing in the interior 51 exchanges heat with all the valve guides 20. For this reason, the heat transmitted to the shaft portions 15 of the plurality of exhaust valves 5 is all transmitted to the oil 52 in the oil passage 51 through the valve guide 20.

  Since the hollow intake / exhaust valve cooling device 50 described above is provided with an oil passage 51 in the vicinity of the valve guide 20 in the vicinity of the valve guide 20, when supplying oil 52 serving as a refrigerant to the vicinity of the valve guide 20, It can be supplied by circulating in the passage 51. Thereby, when a plurality of exhaust valves 5 are provided in the internal combustion engine, the oil 52 can flow in the vicinity of the plurality of valve guides 20 while receiving the heat of the valve guide 20. Therefore, the oil 52 can be efficiently supplied to the vicinity of the valve guide 20. As a result, the heat of the plurality of valve guides 20 can be radiated efficiently, and therefore, the thermal deterioration of the oil seal 30 can be more reliably suppressed.

  The hollow intake / exhaust valve cooling device according to the third embodiment has substantially the same configuration as the hollow intake / exhaust valve cooling device according to the second embodiment, but is characterized in that a groove portion through which oil flows is formed in the valve guide. There is. Since other configurations are the same as those of the second embodiment, the description thereof is omitted and the same reference numerals are given. FIG. 4 is a schematic view showing a hollow intake / exhaust valve cooling device according to Embodiment 3 of the present invention. In the hollow intake / exhaust valve cooling device 60 shown in the same figure, oil circulating in the internal combustion engine passes through an outer peripheral surface 62 of a valve guide 61, and a groove portion 63 which is a part of a refrigerant passage is formed. The groove 63 is formed as a part of the refrigerant supply means, and is formed in a portion of the outer peripheral surface 62 of the valve guide 61 that contacts the cylinder head 40, and a portion of the valve guide 61 that contacts the cylinder head 40. It is formed over the entire circumference of the outer peripheral surface 62 of the. The width of the groove 63 is narrower than the axial length of the shaft 15 at the portion where the cylinder head 40 and the valve guide 61 are in contact, and the depth of the groove 63 extends from the outer peripheral surface 62 of the valve guide 61 to the valve. It is shallower than the thickness up to the guide contact portion 64. The groove 63 is formed in all the valve guides 61 provided around the plurality of exhaust valves 5 formed.

  The cylinder head 40 is formed with an oil passage 65 formed in the shape of a hole-like passage, and the oil passage 65 is open to the groove 63 of the valve guide 61. Further, the oil passage 65 is formed so that the plurality of oil passages 65 are positioned between the valve guides 61 so as to open to all the groove portions 63 of the plurality of formed valve guides 61. Each oil passage 65 located between the valve guides 61 opens into the groove portion 63, so that the groove portions 63 formed in the plurality of valve guides 61 are all connected.

  The hollow intake / exhaust valve cooling device 60 according to the third embodiment is configured as described above, and the operation thereof will be described below. When the internal combustion engine is operated, the oil 66 circulates in the oil passage 65 similarly to the hollow intake / exhaust valve cooling device 50 according to the second embodiment. Since the oil passage 65 is open to the groove 63 formed in the valve guide 61, the oil 66 flows through the groove 63. At that time, heat received from the combustion chamber by the umbrella portion 10 of the exhaust valve 5 during operation of the internal combustion engine is transmitted from the shaft portion 15 to the valve guide 61 and from the valve guide 61 to the oil 66 flowing in the groove portion 63. Further, the oil 66 flows through the oil passage 65 and flows into the groove 63 of the other valve guide 61 or another part of the internal combustion engine.

  The hollow intake / exhaust valve cooling device 60 described above has a groove 63 formed on the outer peripheral surface 62 of the valve guide 61 as a part of the cooling passage. Thus, when the oil 66 flows into the groove portion 63, the oil 66 flows so as to contact the valve guide 61. In other words, the groove 63 is provided so that the oil 66 contacts the valve guide 61. For this reason, since the oil 66 can be brought into direct contact with the valve guide 61, the heat of the valve guide 61 can be radiated to the oil 66 more reliably. Moreover, since the groove part 63 is formed in all the some valve guides 61, and these groove parts 63 are connected by the oil channel | path 65, like the hollow intake / exhaust valve cooling device 50 which concerns on Example 2, oil 66 can flow through the groove portions 63 of the plurality of valve guides 61 while receiving heat from the valve guide 61, and the oil 66 can be efficiently supplied to the valve guide 61. As a result, the heat of the plurality of valve guides 61 can be efficiently radiated, and the thermal deterioration of the oil seal 30 can be more reliably suppressed.

  FIG. 5 is a diagram illustrating a modification of the hollow intake / exhaust valve cooling device according to the third embodiment. In the hollow intake / exhaust valve cooling device 60 according to the third embodiment, the groove 63 is formed in the valve guide 61, but the groove 63 may be formed in a portion other than the valve guide 61. For example, as shown in FIG. 5, the groove portion 70 that becomes a part of the refrigerant passage may be formed around the valve guide 61 in the cylinder head 40 at a portion that contacts the valve guide 61. Even when the groove 70 is formed in the cylinder head 40, the oil 66 flowing in the groove 70 is formed by forming the groove 70 in a portion of the cylinder head 40 that contacts the valve guide 61 so as to open to the valve guide 61. Can be made to flow while directly contacting the valve guide 61. In the case where a plurality of valve guides 61 are formed and the groove portions 70 are formed around each valve guide 61, when the groove portions 70 are connected to each other by the oil passage 65, the oil 66 heats the valve guide 61. The plurality of groove portions 70 can flow one after another while receiving. As a result, the heat of the plurality of valve guides 61 can be efficiently radiated, and the thermal deterioration of the oil seal 30 can be more reliably suppressed.

  FIG. 6 is a diagram illustrating a modification of the hollow intake / exhaust valve cooling device according to the embodiment. In addition, the oil that serves as the refrigerant in the hollow intake / exhaust valve cooling devices 1, 50, and 60 described above circulates in the internal combustion engine and exchanges heat with the valve guides 20 and 61 (see FIGS. 1, 3, and 4). However, after heat exchange with the valve guides 20 and 61, heat exchange may be further performed. For example, when the internal combustion engine is mounted on a vehicle and a vehicle compartment heater (not shown) is provided on the vehicle, as shown in FIG. 6, cooling water in which oil flows toward the vehicle compartment heater. May be formed so as to exchange heat with each other. In other words, the vehicle compartment heater provided in the vehicle interior, that is, the vehicle interior (not shown), is between the cooling water whose temperature has been increased by receiving heat from the operating internal combustion engine and the air introduced into the vehicle interior. The temperature of the passenger compartment is raised by exchanging heat with the oil, but oil that exchanges heat with the valve guides 20 and 61 through the cylinder head 40 is exchanged with this cooling water. You may make it do.

  Specifically, the heater cooling water path 82 which is a path of cooling water flowing toward the passenger compartment heater is branched from the cooling water path 81 which is a cooling water path for cooling the internal combustion engine during operation. Has been. The heat exchanger 83 may be provided so that the heater coolant path 82 and the oil path 80, which is a path through which oil is exchanged between the valve guides 20 and 61, are close to each other. The heat exchanger 83 is provided on the downstream side of the valve guides 20 and 61 in the oil path 80 so that the oil path 80 and the heater cooling water path 82 are close to each other, and flows in the oil path 80. Heat exchange is provided between the oil and the cooling water flowing in the heater cooling water passage 82.

  For this reason, during operation of the internal combustion engine, heat exchanged with the valve guides 20, 61 flows through the heat exchanging portion 83, so that oil whose temperature has been increased due to the heat of the valve guides 20, 61 flows. . Further, since the heat exchanging portion 83 is provided so as to be able to exchange heat between the oil flowing in the oil passage 80 and the cooling water flowing in the heater cooling water passage 82, the oil in the oil passage 80 is The heat exchange unit 83 radiates heat to the cooling water in the heater cooling water passage 82. As a result, the oil in the oil passage 80 dissipates heat when passing through the heat exchanging portion 83 and the temperature drops, and the cooling water in the heater cooling water passage 82 receives heat when passing through the heat exchanging portion 83. The temperature rises.

  Thus, the temperature of the oil in the oil path 80 decreases when passing through the heat exchanging portion 83, so that when heat is exchanged with the valve guides 20 and 61 again, more heat is supplied to the valve guide. 20 and 61. As a result, the heat of the shaft portion 15 of the exhaust valve 5 is dissipated, and the temperature rise of the shaft portion 15 is suppressed. Accordingly, the temperature increase of the oil seal 30 (see FIGS. 1, 3, and 4) is suppressed. can do. On the other hand, the temperature of the cooling water in the heater cooling water passage 82 rises when it passes through the heat exchanging portion 83, so that the temperature in the vehicle compartment can be quickly raised when the vehicle compartment heater is used. That is, by providing the heat exchanging portion 83, the oil that has reached a high temperature can be cooled, the vehicle interior can be warmed up quickly, and the heat received by the exhaust valve 5 from the combustion chamber can be used for the vehicle compartment heater. Can be used as heat. As a result, it is possible to easily raise the temperature of the passenger compartment with the passenger compartment heater, and more reliably suppress the thermal deterioration of the oil seal 30.

  Further, in the hollow intake / exhaust valve cooling device 50 according to the second embodiment, the oil 52 that circulates in the internal combustion engine is used as the refrigerant as in the hollow intake / exhaust valve cooling device 1 according to the first embodiment. Cooling water for cooling the internal combustion engine at the time may be used. An oil passage 51 is formed in the cylinder head 40 of the hollow intake / exhaust valve cooling device 50 according to the second embodiment. In the cylinder head 40, a cooling water passage having the same shape as the oil passage 51 is formed. Instead of the oil 52, cooling water may be used as the refrigerant. By forming a cooling water passage having the same shape as the oil passage 51 of the hollow intake / exhaust valve cooling device 50 according to the second embodiment, the cooling water in the cooling water passage does not contact the valve guide 20, so that the cooling water is in the combustion chamber. There is no risk of entering, and cooling water can be used as the refrigerant. A radiator (not shown) is provided in the coolant path, and the coolant cools each part of the internal combustion engine while radiating heat to the outside air by the radiator. Therefore, by cooling the valve guide 20 with this cooling water, the temperature of the valve guide 20 can be more reliably lowered, and further, the temperature rise of the shaft portion 15 of the exhaust valve 5 is suppressed, and the oil seal 30 Temperature rise can be suppressed. As a result, thermal deterioration of the oil seal 30 can be suppressed more reliably.

  In addition, the hollow intake / exhaust valve cooling device 1 according to the first embodiment has only one oil jet nozzle 45 provided in the vicinity of one valve guide 20, but a plurality of oil jet nozzles 45 are provided in the vicinity of one valve guide 20. An oil jet nozzle 45 may be provided, and oil 48 may be jetted and supplied from a plurality of oil jet nozzles 45 to one valve guide 20. Thereby, since the oil 48 can be sprayed and supplied to a wide range of the valve guide 20, the heat of the valve guide 20 can be radiated more reliably to the oil 48. Accordingly, the heat of the shaft portion 15 can be more easily radiated to the valve guide 20 and the temperature rise of the shaft portion 15 can be suppressed. Accordingly, the temperature increase of the oil seal 30 can also be suppressed. As a result, thermal deterioration of the oil seal 30 can be suppressed more reliably.

  Further, in the hollow intake / exhaust valve cooling device 1 according to the first embodiment, the oil 48 is supplied to the valve guide 20 by injecting the oil 48 by the oil jet nozzle 45, but the oil jet nozzle 45 is controlled to The injection of the oil 48 from the jet nozzle 45 may be performed only when the temperature of the valve guide 20 is likely to increase. For example, a temperature sensor (not shown) is provided in the valve guide 20 to detect the temperature of the valve guide 20, and the oil 48 is injected from the oil jet nozzle 45 only when the temperature of the valve guide 20 becomes higher than a predetermined temperature. May be. Alternatively, a valve (not shown) that opens only when the oil pressure increases in the vicinity of the oil jet nozzle 45 in the path of the oil 48 toward the oil jet nozzle 45 is provided. The oil 48 may be supplied to the oil jet nozzle 45 and injected from the oil jet nozzle 45 only when the rotational speed becomes high.

  Alternatively, information on the operating status of the internal combustion engine is extracted from an ECU (Electric Control Unit) (not shown) that controls the operation of the internal combustion engine, and only when the temperature of the valve guide 20 is likely to be higher than the information on the operating status. Oil 48 may be injected from the oil jet nozzle 45. As a result, when it is not necessary to lower the temperature of the valve guide 20, the oil jet nozzle 45 does not perform the injection, and accordingly, power consumption for operating the oil jet nozzle 45 can be reduced and the valve guide can be reduced. When it is necessary to lower the temperature 20, the oil 48 can be reliably injected from the oil jet nozzle 45. As a result, power consumption can be reduced and thermal deterioration of the oil seal 30 can be suppressed. These controls are applied not only to the hollow intake / exhaust valve cooling device 1 according to the first embodiment, but also to the hollow intake / exhaust valve cooling device 50 according to the second embodiment and the hollow intake / exhaust valve cooling device 60 according to the third embodiment. May be. That is, the oils 52 and 66 may flow through the oil passages 51 and 65 only when the temperature of the valve guide 20 is likely to rise.

  Further, in the above-described hollow intake / exhaust valve cooling devices 1, 50, 60, the exhaust valve 5 is described as an example of the hollow intake / exhaust valve of the hollow intake / exhaust valve cooling devices 1, 50, 60. The hollow intake / exhaust valves of the hollow intake / exhaust valve cooling devices 1, 50, 60 may be hollow intake / exhaust valves other than the exhaust valve 5 or intake valves. Even in a hollow intake / exhaust valve other than the exhaust valve 5, the valve surface 11 faces the combustion chamber, and the heat conduction medium 18 is provided in the hollow portion 16, whereby an oil seal 30 that contacts the shaft portion 15 of the hollow intake / exhaust valve. When there is a possibility that the temperature of the oil seal 30 may rise, the thermal deterioration of the oil seal 30 can be suppressed by applying the present invention.

  As described above, the hollow intake / exhaust valve cooling device according to the present invention is useful for a hollow intake / exhaust valve cooling device having an oil seal, and in particular, a hollow portion in which a heat conduction medium is enclosed in the hollow intake / exhaust valve. Suitable when formed.

It is the schematic which shows the hollow intake / exhaust valve cooling device which concerns on Example 1 of this invention. It is a figure which shows the state which the exhaust valve of FIG. 1 moved. It is the schematic which shows the hollow intake / exhaust valve cooling device which concerns on Example 2 of this invention. It is the schematic which shows the hollow intake / exhaust valve cooling device which concerns on Example 3 of this invention. It is a figure which shows the modification of the hollow intake / exhaust valve cooling device which concerns on Example 3. FIG. It is a figure which shows the modification of the hollow intake / exhaust valve cooling device which concerns on an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 50, 60 Hollow intake / exhaust valve cooling device 5 Exhaust valve 10 Umbrella part 11 Valve surface 12 Slope 15 Shaft part 15a Umbrella part side edge part 15b Oil seal side edge part 16 Hollow part 18 Thermal conduction medium 20, 61 Valve guide 21 , 64 Valve guide contact portion 30 Oil seal 31 Oil seal contact portion 40 Cylinder head 45 Oil jet nozzle 48, 52, 66 Oil 51, 65 Oil passage 62 Outer peripheral surface 63, 70 Groove portion 80 Oil passage 81 Cooling water passage 82 Cooling for heater Water path 83 Heat exchanger

Claims (7)

A hollow portion that is provided in the internal combustion engine and has an umbrella portion at one end of a shaft portion, and a hollow portion is formed inside the shaft portion and the umbrella portion, and a heat conduction medium is enclosed in the hollow portion. Intake and exhaust valves;
An oil seal in contact with the shaft portion;
A valve guide that slidably supports the shaft portion and is positioned between the portion of the shaft portion that contacts the oil seal and the umbrella portion,
Refrigerant supply means for supplying a refrigerant that exchanges heat with the valve guide;
A hollow intake / exhaust valve cooling device comprising:   The hollow intake / exhaust valve cooling device according to claim 1, wherein the refrigerant supply unit injects the refrigerant into the valve guide.   2. The hollow intake / exhaust valve cooling device according to claim 1, wherein at least a part of the refrigerant supply means is provided in the vicinity of the valve guide and has a refrigerant passage through which the refrigerant passes.   4. The hollow intake / exhaust valve cooling device according to claim 3, wherein the refrigerant passage has a groove formed on an outer peripheral surface of the valve guide.   The hollow intake / exhaust valve cooling device according to claim 3, wherein the refrigerant passage has a groove formed to open to the valve guide. The internal combustion engine is mounted on a vehicle;
The vehicle is provided with a vehicle interior heater that exchanges heat between air introduced into the vehicle interior of the vehicle and cooling water that cools the internal combustion engine,
6. The refrigerant according to claim 1, wherein the refrigerant after heat exchange with the valve guide exchanges heat with the cooling water flowing toward the vehicle compartment heater. Hollow intake and exhaust valve cooling device. The hollow intake / exhaust valve cooling device according to any one of claims 1 to 6, wherein oil that circulates in the internal combustion engine is used as the refrigerant.

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