JP2012225270A - Internal combustion engine cylinder head cooling water passage structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine cylinder head cooling water passage structure for easily discharging air entering a dead end-like cooling water passage, without affecting an inclination of the whole cooling water passage of a cylinder head.SOLUTION: Air remaining in the dead end-like cooling water passage 116 can be easily discharged by a ceiling surface 116a which is inclined with the cooling water outlet 114 located higher. After discharging the air, cooling water heated by the dead end-like cooling water passage 116 is lightened, moves up toward the ceiling surface 116a, and is guided toward the cooling water outlet 114by an inclination of the ceiling surface 116a. Thus, replacement of the cooling water in the dead end-like cooling water passage 116 is facilitated. A cooling water flow bypasses a straightening plate 114a, hardly directly flows in a cooling water outlet 114, and mainly flows in the dead end-like cooling water passage 116. Thus, a cooling water agitating flow in the dead end-like cooling water passage 116 is strengthened, and the action of discharging the air and the heated cooling water to the cooling water outlet 114 side is enhanced.

Description

  The present invention forms a cooling water passage for flowing cooling water in a cylinder arrangement direction in a cylinder head of an internal combustion engine, introduces cooling water into the cooling water passage from the cooling water inlet, and discharges the cylinder head from the cooling water outlet. The present invention relates to a cylinder head cooling channel structure for cooling.

When cooling a cylinder head of an internal combustion engine with cooling water, cooling water is allowed to flow from one end to the other end in a cylinder arrangement direction in a water jacket formed in the cylinder head.
In the cooling water channel having this configuration, when air stays inside, the wall surface of the cooling water channel is thermally insulated by the air pool, which may cause a decrease in cooling efficiency due to the cooling water or cause boiling.

  In order to prevent such air accumulation in the cooling water channel, there is a known water jacket in which the entire upper wall surface constituting the ceiling of the cooling water channel is inclined so that it gradually rises from the upstream to the downstream of the cooling water. (See, for example, Patent Document 1).

  Furthermore, the cooling water passage of the internal combustion engine mounted so that the output shaft is inclined downward is configured as a stepped ceiling portion, thereby preventing the air pool in the water jacket and increasing the rigidity of the bolt boss portion. A head structure is known (see, for example, Patent Document 2).

  Furthermore, a communication pipe that connects the upper side of the cooling water passage of the internal combustion engine mounted so that the output shaft is inclined downward and the cooling water supply port is provided, and when air accumulates in the cooling water passage, the connection pipe is used. An air venting device that discharges air from a water supply port is known (see, for example, Patent Document 3). In this patent document 3, a drill hole for extracting air from the fresh water pump is also provided.

Japanese Utility Model Publication No. 6-53741 (page 7, FIGS. 1 to 3) JP-A-8-338300 (pages 6-7, FIGS. 1, 4 and 6) Japanese Patent Laid-Open No. 2003-254060 (pages 3 to 4, FIGS. 2 to 4)

  When forming a water jacket on the cylinder head, the position of the coolant outlet is restricted due to design reasons, for example, the relationship with the cylinder block side, and the outlet cannot be formed at the end in the cylinder arrangement direction. It may become more. Such a restriction is likely to occur particularly when a plurality of cooling water channels are formed in the cylinder head in the cylinder arrangement direction.

  Thus, when an exit comes from the center, a space between the exit and the end of the cooling water channel becomes a dead-end cooling water channel. In such a configuration, a sufficient water flow can be obtained in the cooling water channel between the inlet and the outlet, but it is difficult to generate a water flow in the bag-like cooling water channel. For this reason, when air enters the pavement-like cooling water channel, it becomes difficult to escape and cooling efficiency decreases.

In Patent Documents 1 to 3 described above, there is no countermeasure for the water jacket in which the outlet is arranged from the center of the cooling water channel.
In other words, even if the entire ceiling surface is tilted uniformly as in Patent Documents 1 and 3, the air from the inlet to the outlet is discharged, but the air that has entered the culvert-shaped cooling water channel on the upper side of the tilt is It just goes inside. For this reason, cooling efficiency will fall further. The same applies to Patent Document 2 in which the ceiling is stepped.

  If the entire cooling water channel is tilted so that the cooling channel is down, the air in the cooling channel can be discharged. However, in an internal combustion engine with a large restriction on the cooling channel design, the entire cooling channel of the cylinder head is tilted. That itself is difficult. In addition, if the entire cooling water channel is inclined, the difference in flow velocity distribution in the cooling water channel becomes large, and the entire cylinder head may not be uniformly cooled.

  The same applies to the case where the inlet of the cooling water cannot be formed at the end in the arrangement direction of the cylinders and is located at the center. That is, the same problem arises because the gap between the inlet and the end of the cooling water channel becomes a bag-shaped cooling water channel.

  It is an object of the present invention to provide a cooling water channel structure that can easily discharge air that has entered a bag-shaped cooling water channel without affecting the inclination of the entire cooling water channel of a cylinder head.

In the following, means for achieving the above-mentioned purpose, and its operation and effect are described.
In the internal combustion engine cylinder head cooling water channel structure according to claim 1, a cooling water channel is formed in the cylinder head of the internal combustion engine to flow cooling water in the cylinder arrangement direction, and cooling water is introduced into the cooling water channel from a cooling water inlet. A cylinder head cooling water channel structure for cooling the cylinder head by discharging from the cooling water outlet, wherein the cooling water outlet is set at a position away from the downstream end of the cooling water flow in the cooling water channel to the upstream side. At the same time, the ceiling surface of the culvert-shaped cooling water channel between the cooling water outlet and the downstream end portion of the cooling water flow forms an inclined surface with the cooling water outlet side upward.

  According to this configuration, the ceiling surface of the constricted cooling water channel between the cooling water outlet and the downstream end of the cooling water flow is an inclined surface with the cooling water outlet side upward. Therefore, it is not necessary to incline the entire cooling water channel.

  Even if air enters the pavement-like cooling water channel, the air is pushed to the ceiling side due to the difference in specific gravity with the cooling water. Since this ceiling surface is an inclined surface with the cooling water outlet side upward, the air pressed against the ceiling surface due to the difference in specific gravity with the cooling water moves to the cooling water outlet side. When the position of the cooling water outlet is reached, there is a sufficient cooling water flow at that position, so that air is sucked into the cooling water outlet and discharged from the cooling water channel.

  Further, even after the air is discharged, the cooling water heated in the culvert-like cooling water channel during operation of the internal combustion engine becomes lighter and rises to the ceiling side. For this reason, the heated cooling water is also guided to the cooling water outlet side by the inclination of the ceiling surface. Therefore, the inclination of the ceiling surface is accompanied by a secondary effect that the replacement of the cooling water in the culvert-like cooling water channel is promoted.

With respect to the cooling water channel from the cooling water inlet to the cooling water outlet, air is discharged from the outlet by the cooling water flow without considering the inclination.
Therefore, it is possible to realize a cooling water channel structure that can easily discharge the air that has entered the bag-like channel cooling water channel without affecting the inclination of the entire cooling water channel of the cylinder head.

  The internal combustion engine cylinder head cooling water channel structure according to claim 2, wherein the cooling water channel has a water flow direction upstream of the cooling water outlet and the cooling water flow direction. A direct flow to the outlet is prevented, and a water flow direction changing portion directed to the bag-shaped cooling water channel is provided.

  By providing the water flow direction changing portion in this way, the cooling water flowing through the cooling water channel does not go directly to the cooling water outlet but goes to the downstream end of the cooling water flow, so that the cooling water stirring flow in the bag-shaped cooling water channel can be reduced. Strengthen the action of discharging air and heated cooling water to the cooling water outlet side.

This makes it possible to discharge air and heating / cooling water more effectively.
In the internal combustion engine cylinder head cooling water channel structure according to claim 3, a cooling water channel is formed in the cylinder head of the internal combustion engine to flow the cooling water in the cylinder arrangement direction, and cooling water is introduced into the cooling water channel from the cooling water inlet. A cylinder head cooling water channel structure for cooling the cylinder head by discharging from the cooling water outlet, wherein the cooling water inlet is set at a position away from the cooling water flow upstream end in the cooling water channel to the downstream side. At the same time, the ceiling surface of the culvert-shaped cooling water channel between the cooling water inlet and the upstream end of the cooling water flow forms an inclined surface with the cooling water inlet side upward.

  According to this configuration, the ceiling surface of the constricted cooling water channel between the cooling water inlet and the upstream end of the cooling water flow is an inclined surface with the cooling water inlet side upward. Therefore, it is not necessary to incline the entire cooling water channel.

  Even if air enters the pavement-like cooling water channel, the air is pushed to the ceiling side due to the difference in specific gravity with the cooling water. Since this ceiling surface is an inclined surface with the cooling water inlet side upward, the air pressed against the ceiling surface due to the difference in specific gravity with the cooling water moves to the cooling water inlet side. Then, when the position of the cooling water inlet is reached, there is a sufficient cooling water flow at that position, so the air flows from the position of the cooling water inlet to the downstream cooling water outlet, and finally the cooling water outlet It is sucked into and discharged from the cooling water channel.

  Further, even after the air is discharged, the cooling water heated in the culvert-like cooling water channel during operation of the internal combustion engine becomes lighter and rises to the ceiling side. For this reason, the heated cooling water is also guided to the cooling water inlet side by the inclination of the ceiling surface. Therefore, the inclination of the ceiling surface is accompanied by a secondary effect that the replacement of the cooling water in the culvert-like cooling water channel is promoted.

Even if air exists in the cooling water passage from the cooling water inlet to the cooling water outlet, the air is discharged from the outlet by the cooling water flow as described above without considering the inclination.
Therefore, it is possible to realize a cooling water channel structure that can easily discharge the air that has entered the bag-like channel cooling water channel without affecting the inclination of the entire cooling water channel of the cylinder head.

  5. The internal combustion engine cylinder head cooling water channel structure according to claim 4, wherein the internal combustion engine is for driving a vehicle, and the bag path is formed by the internal combustion engine cylinder head cooling water channel structure according to claim 1. The cylindrical cooling water channel is formed at an inclination angle at which the state of the inclined surface is maintained in a state where the internal combustion engine is mounted on a vehicle.

  In particular, when mounted on a vehicle, the ceiling surface of the culvert-like cooling water channel is inclined so as to maintain the state of the inclined surface with the cooling water outlet side upward or the state of the inclined surface with the cooling water inlet side upward. By forming the angle, it is possible to surely produce the above-described actions and effects.

  In the internal combustion engine cylinder head cooling water channel structure according to claim 5, in the internal combustion engine cylinder head cooling water channel structure according to any one of claims 1 to 4, the cylinder head of the internal combustion engine includes most of the cylinder head. And a sub-water jacket for cooling a part of the cylinder head, and the sub-water jacket corresponds to the cooling water channel.

  When the cylinder head includes a main water jacket and a sub water jacket, the cooling water flow tends to be weak on the sub water jacket side by mainly supplying the cooling water to the main water jacket side.

However, since the air discharge from the culvert-like cooling water channel is due to the inclination of the ceiling surface, the effect can be sufficiently exerted regardless of the strength of the cooling water flow.
Therefore, in the cylinder head of an internal combustion engine having such a plurality of cooling water channels, a remarkable air discharge effect can be obtained by applying the present invention to the sub-water jacket.

FIG. 3 is a horizontal cross-sectional configuration explanatory diagram of the internal combustion engine cylinder head of the first embodiment. FIG. 3 is a vertical cross-sectional configuration explanatory diagram of the sub-water jacket according to the first embodiment. (A), (b) Structure explanatory drawing of the sub-water jacket of Embodiment 2. FIG. (A), (b) Structure explanatory drawing of the sub-water jacket of Embodiment 3. FIG.

[Embodiment 1]
<Configuration> FIG. 1 shows a cylinder head 2 of an internal combustion engine to which the above-described invention is applied, and shows a horizontal sectional configuration thereof. The cylinder head 2 corresponds to a combustion chamber of a plurality of in-line cylinders (in-line four cylinders in the present embodiment), and each combustion chamber is provided with two intake ports 4 and two exhaust ports 6. It has been. A hole 8 for attaching a spark plug is formed at a position corresponding to the center of each combustion chamber.

  A plurality of water jackets 10 and 12 are provided inside the cylinder head 2. The main water jacket 10 is provided on the entire cylinder head 2 except for the curved inner region of the exhaust port 6. The main water jacket 10 is supplied with cooling water to the rear side indicated by R on the right side of the figure via a cylinder block or an external supply path, and flows from the rear side to the front side indicated by F on the left side of the figure. Are discharged.

  The sub-water jacket 12 is formed long continuously from the rear side to the front side in a curved inner region of the exhaust port 6, that is, a region between the exhaust port 6 and the cylinder block connection surface. The cooling water supplied to the main water jacket 10 is distributed to the sub-water jacket 12 so that the cooling water is supplied on the rear side, flows from the rear side to the front side, and flows from the cooling water outlet 14 to the cylinder block. To the side.

  A vertical cross-sectional configuration of the sub-water jacket 12 is shown in FIG. A part of the cooling water supplied to the main water jacket 10 is distributed and supplied to the sub-water jacket 12 from the distribution passage 12a. The distribution passage 12 a introduces cooling water into the sub-water jacket 12 from a cooling water inlet 12 b provided at the rear end of the sub-water jacket 12.

  The cooling water introduced from the cooling water inlet 12b flows to the front side in the continuous sub-water jacket 12 and reaches the downstream end 12c of the cooling water flow of the sub-water jacket 12 as indicated by the solid arrows. It is discharged from the cooling water outlet 14 provided in front to the cylinder block side.

Here, the reason why the cooling water outlet 14 is not provided at the position of the cooling water flow downstream end 12c of the sub-water jacket 12 is because of restrictions on the design of the internal combustion engine.
However, in the culvert-shaped cooling water channel 16 which is a region between the cooling water flow downstream end 12c and the cooling water outlet 14, the ceiling surface 16a forms an inclined surface with the cooling water outlet 14 side upward.

Here, the internal combustion engine is for driving the vehicle, and even when the internal combustion engine is mounted on the vehicle, the ceiling surface 16a is formed to be an inclined surface with the cooling water outlet 14 side upward. That is, even when the internal combustion engine is mounted on the vehicle at a mounting angle in which the front side is higher than the rear side rather than leveling the crankshaft, the 1 ° inclined surface with the cooling water outlet 14 side facing upward Is designed so that the ceiling surface 16a is inclined.
<Operation> In the internal combustion engine configured as described above, in the cooling water passage of the sub-water jacket 12 from the cooling water inlet 12b to the cooling water outlet 14 in the cylinder head 2, the water flow as indicated by the solid arrow indicates that the internal Even if air remains, it can be discharged from the cooling water outlet 14.

  However, since the cooling water flow downstream end portion 12c side is a dead end in the cooling passage 16 located on the front side of the cooling water outlet 14, the flow of the cooling water accompanying the water flow from the cooling water inlet 12b hardly occurs. Therefore, even if air remains in the sac-line-like cooling water channel 16, it cannot be discharged by a water flow.

However, due to the difference in specific gravity between air and water, the air is pressed against the ceiling surface 16 a side in the culvert-like cooling water channel 16. Since this ceiling surface 16a is inclined with the cooling water outlet 14 side as the upper side, the air in the culvert-like cooling water channel 16 is guided to the inclination of the ceiling surface 16a, and the cooling water outlet as shown by the broken arrow line. Move to the 14th side. When reaching the position above the cooling water outlet 14, the cooling water flowing from the cooling water inlet 12 b side to the cooling water outlet 14 is guided into the cooling water outlet 14 and discharged from the sub-water jacket 12.
<Effect> (1) As described above, the residual air in the pouch-like cooling water channel 16 can be easily discharged because the ceiling surface 16a is an inclined surface with the cooling water outlet 14 side upward. Therefore, it is not necessary to incline the entire sub-water jacket 12.

  Further, even after the air is discharged, the cooling water heated in the culvert-like cooling water channel 16 becomes lighter and rises to the ceiling surface 16a side. For this reason, the heated cooling water is also guided to the cooling water outlet 14 side by the inclination of the ceiling surface 16a. Therefore, the replacement of the cooling water in the culvert-like cooling water channel 16 is promoted by the inclination of the ceiling surface 16a.

  Of the sub-water jacket 12, the cooling water passage from the cooling water inlet 12 b to the cooling water outlet 14 does not take into account the inclination of the ceiling surface, that is, even if it is in a horizontal state, It is discharged from the cooling water outlet 14 by the cooling water flow.

For this reason, it is possible to easily discharge the air that has entered the narrow path cooling water channel 16 without affecting the overall inclination of the sub-water jacket 12.
And the cooling effect by subwater jacket 12 can fully be exhibited by this.

  (2) Since the cylinder head 2 is provided with two cooling water passages of the main water jacket 10 and the sub water jacket 12, the cooling water flow tends to be weak on the sub water jacket 12 side.

  However, since the discharge of air from the culvert-like cooling water channel 16 is due to the inclination of the ceiling surface 16a, the air discharge and the heating cooling water discharge can be sufficiently effective regardless of the strength of the cooling water flow.

[Embodiment 2]
<Structure> In this embodiment, as shown in FIGS. 3A and 3B, the sub-water jacket 112 is adjacent to the upstream side of the cooling water outlet 114, and the rectifying plate 114a (in the water flow direction changing portion). Equivalent). Other configurations are the same as those in the first embodiment. FIG. 3A shows the configuration of the main part of the horizontal cross section of the cylinder head 102, and FIG. 3B shows the cross-sectional configuration of the vertical direction.

As described above, in the sub-water jacket 112, a restriction is formed in the sub-water jacket 112 due to the presence of the rectifying plate 114 a. Therefore, in order to prevent excessive pressure loss, the cross-sectional area of the throttle is kept within a range of 1.2 to 2 times the minimum cross-sectional area in the cooling system of the sub-water jacket 112. With this degree of restriction, the pressure loss does not become excessive and the flow rate and flow velocity do not drop significantly. Therefore, the cooling water can flow through the sub-water jacket 112 at a sufficient flow rate and flow velocity.
<Operation> In the internal combustion engine including the cylinder head 102 configured as described above, the cooling water passage of the sub-water jacket 112 from the cooling water inlet 112b to the cooling water outlet 114 is indicated by a solid arrow in the cylinder head 102. A cooling water flow is generated.

  Here, the cooling water flow from the cooling water inlet 112b to just before the rectifying plate 114a is almost as shown in FIGS. 1 and 2 of the first embodiment. However, since the rectifying plate 114a exists adjacent to the upstream side of the cooling water outlet 114, the rectifying plate 114a prevents the cooling water flow from going straight to the cooling water outlet 114. Therefore, the cooling water flow bypasses the gap on the left side when viewed from the upper side of the rectifying plate 114a and the cooling water flow direction. Moreover, since the sub-water jacket 112 is throttled by the rectifying plate 114a, the flow velocity of the bypassed coolant flow increases.

  Therefore, even if it flows around the rectifying plate 114a and flows out from the gap toward the cooling water outlet 114, the cooling water flow becomes difficult to flow directly into the cooling water outlet 114, and as shown by a solid line arrow, It will flow into the cooling water channel 116.

For this reason, together with the discharge action of the remaining air and the heated cooling water by the ceiling surface 116a forming the inclined surface with the cooling water outlet 114 side as described above in the first embodiment, to the downstream end 112c of the cooling water flow The cooling water flow toward the cooling water agitating flow 116 in the bag-shaped cooling water channel 116 is strengthened, and the action of discharging the air and the heating cooling water to the cooling water outlet 114 side is enhanced.
<Effects> (1) In addition to the effects of the first embodiment, the air discharge effect and the heating / cooling water discharge effect in the bag path-like cooling water channel 116 are further enhanced by the rectifying plate 114a.

Therefore, the cooling effect by the sub-water jacket 112 can be further enhanced.
[Embodiment 3]
<Configuration> The configuration of the main part of the present embodiment is as shown in FIG. 4 (a) or (b). In the configuration example of FIG. 4A, the cooling water outlet 214 in the sub-water jacket 212 exists at the end of the sub-water jacket 212 on the downstream side of the cooling water flow. For this reason, there is no occluded cooling water channel at the downstream end of the cooling water flow. Instead, since the cooling water inlet 218 is closer to the center than the cooling water flow upstream end portion 212a, a bag-shaped cooling water channel 216 is formed between the cooling water inlet 218 and the cooling water flow upstream end portion 212a. The ceiling surface 216a of the culvert-shaped cooling water channel 216 forms an inclined surface with the cooling water inlet 218 side facing upward.

  In the configuration example of FIG. 4B, the cooling water outlet 314 is formed in the sub-water jacket 312 from the cooling water flow downstream end 312 b of the sub-water jacket 312 from the center. Therefore, as in the first embodiment, there is a bag path-like cooling water channel 316 between the cooling water outlet 314 and the cooling water flow downstream end portion 312b. And the ceiling surface 316a of this bag alley cooling water channel 316 forms the inclined surface which makes the cooling water outlet 314 side upward.

  Further, in the configuration of FIG. 4B, the cooling water inlet 318 is also located at the center of the cooling water flow upstream end portion 312a, so that the narrow path cooling is performed between the cooling water inlet 318 and the cooling water flow upstream end portion 312a. A water channel 320 is formed. The ceiling surface 320 a of the bag-like cooling water channel 320 forms an inclined surface with the cooling water inlet 318 side upward.

4A and 4B, the other configuration is the same as that of the first embodiment.
<Operation> The cooling water flow introduced from the cooling water inlets 218 and 318 does not flow into the culvert-shaped cooling water channels 216 and 320 upstream of the cooling water inlets 218 and 318. For this reason, the residual air is not discharged by the cooling water flow. However, even if air enters the pouch-like cooling water channels 216 and 320, the air is pressed against the ceiling surfaces 216a and 320a of the pouch-like cooling water channels 216 and 320 due to the difference in specific gravity with the cooling water. Since the ceiling surfaces 216a and 320a are inclined surfaces with the cooling water inlets 218 and 318 facing upward, the air pressed against the ceiling surfaces 216a and 320a due to the difference in specific gravity with the cooling water is directed to the cooling water inlets 218 and 318. Moving. And it reaches the position of the cooling water inlets 218 and 318. A cooling water flow exists from the position of the cooling water inlets 218 and 318 to the cooling water outlets 214 and 314. Therefore, the air flows through the sub-water jackets 212 and 312, and finally is sucked into the cooling water outlets 214 and 314 and discharged from the sub-water jackets 212 and 312.

  Further, even after the air is discharged, the cooling water heated in the bag-like path cooling water channels 216 and 320 becomes lighter and rises toward the ceiling surfaces 216a and 320a. Therefore, the heated cooling water is also guided to the cooling water inlets 218 and 318 side by the inclination of the ceiling surfaces 216a and 320a. When reaching the position of the cooling water inlets 218 and 318, the cooling water flows through the sub-water jackets 212 and 312 and is discharged from the cooling water outlets 214 and 314 to the cylinder block side.

In this manner, the replacement of the cooling water in the culvert-like cooling water channels 216 and 320 is promoted by the inclination of the ceiling surfaces 216a and 320a.
As described in the first embodiment, the air discharge and the heating / cooling water discharge in the cooling passage-shaped cooling water passage 316 existing on the downstream side of the cooling water flow from the cooling water outlet 314 shown in FIG.
<Effects> (1) With respect to the culvert-like cooling water channels 216 and 320 existing on the upstream side of the cooling water from the cooling water inlets 218 and 318, the sub-water jackets 212 and 312 are inclined as a whole by the inclination of the ceiling surfaces 216a and 320a. The air that has entered the sluice-like cooling water channels 216 and 320 can be easily discharged without being affected. Furthermore, heating and cooling water can be easily discharged.

Thus, the cooling effect by the sub-water jackets 212 and 312 can be sufficiently exhibited.
(2) In the example of FIG. 4B, the same effect as in the first embodiment is further produced.

[Other embodiments]
-In FIG.4 (b) shown in the said Embodiment 3, you may provide the baffle plate shown in the said Embodiment 2 in the upstream of the cooling water exit 314. FIG.

  -Although the said internal combustion engine was an example of the gasoline engine, it is applicable also to a diesel engine.

  2 ... Cylinder head, 4 ... Intake port, 6 ... Exhaust port, 8 ... Hole for attaching spark plug, 10 ... Main water jacket, 12 ... Sub-water jacket, 12a ... Distribution passage, 12b ... Cooling water inlet, 12c ... Cooling Water flow downstream end, 14 ... cooling water outlet, 16 ... bag narrow cooling water channel, 16a ... ceiling surface, 102 ... cylinder head, 112 ... sub-water jacket, 112b ... cooling water inlet, 112c ... cooling water flow downstream end, DESCRIPTION OF SYMBOLS 114 ... Cooling water outlet, 114a ... Current plate, 116 ... Sack-like cooling water channel, 116a ... Ceiling surface, 212 ... Sub-water jacket, 212a ... Cooling water flow upstream end, 214 ... Cooling water outlet, 216 ... Sack-like cooling water channel 216a ... Ceiling surface, 218 ... Cooling water inlet, 312 ... Sub-water jacket, 312a ... Cooling water flow upstream end, 12b ... cooling water downstream end, 314 ... cooling water outlet, 316 ... blind alley-like cooling water passage, 316a ... ceiling surface, 318 ... cooling water inlet, 320 ... blind alley-like cooling water passage, 320a ... ceiling surface.

Claims (5)

A cylinder head that cools the cylinder head by forming a cooling water passage for flowing cooling water in the cylinder arrangement direction in the cylinder head of the internal combustion engine, introducing cooling water from the cooling water inlet to the cooling water passage, and discharging it from the cooling water outlet. A cooling channel structure,
The cooling water outlet is set at a position away from the downstream end portion of the cooling water flow in the cooling water channel to the upstream side, and is a bag-shaped cooling water passage between the cooling water outlet and the downstream end portion of the cooling water flow An internal combustion engine cylinder head cooling water channel structure, wherein the ceiling surface of the internal combustion engine forms an inclined surface with the cooling water outlet side facing upward. 2. The internal combustion engine cylinder head cooling water channel structure according to claim 1, wherein the cooling water channel is upstream of the cooling water outlet and prevents the water flow direction from being directed to the cooling water outlet to the bag-like channel cooling water channel. An internal combustion engine cylinder head cooling water channel structure comprising a directed water flow direction changing portion. A cylinder head that cools the cylinder head by forming a cooling water passage for flowing cooling water in the cylinder arrangement direction in the cylinder head of the internal combustion engine, introducing cooling water from the cooling water inlet to the cooling water passage, and discharging it from the cooling water outlet. A cooling channel structure,
The cooling water inlet is set at a position away from the upstream end of the cooling water flow in the cooling water channel to the downstream side, and is a bag-shaped cooling water channel between the cooling water inlet and the upstream end of the cooling water flow An internal combustion engine cylinder head cooling water channel structure, wherein the ceiling surface of the internal combustion engine forms an inclined surface with the cooling water inlet side facing upward. The internal combustion engine cylinder head cooling water channel structure according to any one of claims 1 to 3, wherein the internal combustion engine is for driving a vehicle, and the bag-like channel cooling water channel is a state in which the internal combustion engine is mounted on a vehicle. The internal combustion engine cylinder head cooling water channel structure is formed at an inclination angle at which the state of the inclined surface is maintained. 5. The internal combustion engine cylinder head cooling water channel structure according to claim 1, wherein a main water jacket for cooling most of the cylinder head and a part of the cylinder head are cooled in the cylinder head of the internal combustion engine. An internal combustion engine cylinder head cooling water channel structure comprising a sub water jacket, wherein the sub water jacket corresponds to the cooling water channel.

Images