KR20030035930A - Cooling apparatus of internal combustion engine - Google Patents

Abstract

PURPOSE: To provide a cooling system for an internal combustion engine of a cooling type in which cooling water is led to a cylinder block cooling water passage through a communicating passage from a cylinder head cooling water passage, which eliminates the accumulation of air generated on the upper part of the cylinder block without providing any specific device to a cylinder block and a cylinder head, and prevents increase of temperature in the cylinder block. CONSTITUTION: Cooling water from a water pump is led to the cylinder head cooling water passage to be cooled, and then led to the cylinder block cooling water passage through the communicating passage from the cylinder head cooling water passage so as to cool the cylinder block and to be sent to the outside of the engine. The cooling system is characteristically provided with a cooling water supply passage directly connecting the outlet side of the water pump to the cylinder block cooling water passage, and a control valve provided to the cooling water outlet passage in the cylinder block to open and close the cooling water outlet passage.

Description

Cooling apparatus of internal combustion engine

The present invention relates to a cooling apparatus of an internal combustion engine applied to an internal combustion engine for a vehicle and the like.

(Conventional technology)

Conventionally, an engine that guides cooling water from a water pump to a cylinder head cooling water, simultaneously directs a portion of the cooling water from the cylinder head cooling water to the cylinder block cooling water, cools the cylinder head and the cylinder block, and discharges it out of the engine. In this case, since the relatively high temperature cooling water after cooling the cylinder head flows into the cylinder block cooling water, the supercooling of the cylinder block is avoided, and the increase in friction between the cylinder and the piston (not shown) is prevented.

However, in such an engine, when the cooling water is filled, in particular, an air stagnation portion in which air stays at the connection portion between the cylinder head cooling water passage and the cylinder block cooling water passage is generated, and at the same time, the air stagnation portion is generated. Even in this case, since the cooling water is always lowered from the cylinder head cooling water passage on the upper side toward the cylinder block cooling water passage on the lower side, the buoyancy force acting on the air prevents the movement of the air in the flow direction of the cooling water. This may make it difficult to discharge the air remaining in the connecting portion to the outside of the engine.

If the air stagnant portion stays near the connecting portion, there is a problem that the cooling performance of the portion may be deteriorated and it may be a cause of thermal deterioration.

As a technique capable of eliminating the air stagnant portion, there is an invention described in JP-A-5-256131. In this invention, in the cooling device of an internal combustion engine, the cooling water is introduced in parallel from the water pump to the cylinder head cooling water passage and the cylinder block cooling water passage, and the cooling water is discharged in parallel from the cylinder head cooling water passage and the cylinder block cooling water passage. And providing a coolant flow path for flowing coolant from the cylinder block to the cylinder head at a place where air stagnation of the cylinder block is likely to occur, and installing a sizzling pin assembly at the position of the coolant flow path. At an abnormally high temperature, the jiggle fin assembly is opened, and part of the cooling water flows from the cylinder block to the cylinder head to dissipate the air stagnation portion.

However, in the invention described in the above publication, there is a fear that the cylinder block may be overcooled and the friction between the cylinder and the piston may increase, and a cooling water flow path for flowing the cooling water from the cylinder block to the cylinder head is provided at a place where air stagnation is likely to occur. In addition, it is necessary to provide a jiggle fin assembly at the cooling water flow path position, which results in a complicated cooling structure in the cylinder block and a complicated manufacturing process of the cooling device of the internal combustion engine.

In view of the problems of the prior art, the present invention provides a relatively simple internal combustion engine in which a part of the cooling water supplied from the water pump to the cylinder head cooling water is led from the cylinder head cooling water path to the cylinder block cooling water. It aims at eliminating the air hold | maintenance part in a cooling water path by a structure.

(Means to solve the task)

In order to solve this problem, the present invention provides a cylinder head cooling water passage formed in a cylinder head, a first supply passage having one end connected to the discharge side of the water pump and the other end connected to the cylinder head cooling water passage, A cylinder block cooling water passage formed in a cylinder block provided below, a connection portion connecting the cylinder head cooling water passage and the cylinder block cooling water passage, and one end of the cylinder head cooling water passage and the cylinder block cooling water passage, respectively; A cooling apparatus of an internal combustion engine having an external flow path having the other end connected to the suction side of the pump, wherein the second supply path has one end connected to the discharge side of the water pump and the other end connected to the cylinder block cooling water passage; An outflow control device provided between the block cooling water path and the external flow path, and closing the outflow control device , It characterized in that the cooling water flows into the cooling water from the cylinder block to the second supply, as in the cylinder head cooling water through the connecting portion.

According to this invention, the flow of the cooling water from the cylinder head cooling water passage to the cylinder block cooling water passage through the connection is almost stopped by closing the outflow regulator, and is supplied from the water pump to the cylinder block cooling water passage through the second supply passage. The coolant flows upward with the cylinder block cooling water through the connecting portion to the cylinder head cooling water passage, and joins with the cooling water supplied from the water pump to the cylinder head cooling water passage through the first supply passage in the cylinder head cooling water passage. It is sent from the cylinder head cooling water path to the external flow path outside the engine.

In this way, even if an air stagnation occurs near the connection between the cylinder head cooling water passage and the cylinder block cooling water passage due to the filling of the cooling water by the cooling water flowing upward from the cylinder block cooling water passage, the air is subjected to its buoyancy. It is discharged to the external flow path outside the engine by passing through the cylinder head cooling water path together with the cooling water without being impaired.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a configuration diagram of a cooling device of an internal combustion engine for a vehicle according to an embodiment of the present invention, showing normal driving time.

FIG. 2 is a configuration diagram of a cooling device of an internal combustion engine for a vehicle according to an embodiment of the present invention, which shows a time for extracting air to the cylinder block cooling water.

(Explanation of symbols for the main parts of the drawing)

3: cylinder head cooling water passage 4: cylinder block cooling water passage

7: water pump 1O: control valve

11 valve controller 18 coolant inlet pipe

2O: Cooling water supply path 23: Connection part

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not merely intended to limit the scope of the present invention, but merely illustrative examples.

1 is a configuration diagram of a cooling apparatus of an internal combustion engine for a vehicle according to an embodiment of the present invention, which shows a normal operation, and FIG. 2 is a diagram illustrating a case where air to the cylinder block cooling water is taken out.

1 and 2, the cylinder head 1 is formed with a cylinder head cooling water passage 3 for flowing cooling water into the cylinder head 1, and the cylinder block 2 provided below the cylinder head 1. The cylinder block cooling water passage 4 is formed in the cooling chamber by flowing the cooling water into the cylinder block 2. The cylinder block cooling water passage 4 and the cylinder head cooling water passage 3 are connected by the connecting portion 23 at the joining surface between the cylinder head 1 and the cylinder block 2, so that the cooling water can flow between them. have. In addition, in this embodiment in which the cooling water passage is an open deck type, the connecting portion 23 refers to the portion where the cylinder head cooling water passage 3 and the cylinder block cooling water passage 4 are connected. When the furnace is provided with a so-called closed deck type cooling water passage, the connecting portion 23 is configured as a communication passage for communicating the cylinder head cooling water passage 3 and the cylinder block cooling water passage 4.

A cooling water inlet pipe 18, which is a first supply path, is connected to the outside of the engine on the upstream side of the cylinder head cooling water path 3, and a further upstream side of the cooling water inlet pipe 18 is connected to the discharge side of the water pump 7. . The cooling water inlet pipe 18 is branched upstream from the connecting portion to the cylinder head cooling water path 3 inlet side and connected to the cylinder block cooling water path 4, and one end is connected to the discharge side of the water pump 7 and the other end. A cooling water supply passage 20 which is a second supply passage connected to the inlet side of the cylinder block cooling water passage 4 is formed. In the present embodiment, the first supply path and the second supply path are partially overlapped to simplify the flow path.

Moreover, the flow path area of the cooling water inlet pipe 18 is formed larger than the flow path area of the cooling water supply path 20, and the flow rate of the cooling water flowing from the cooling water inlet pipe 18 into the cylinder head cooling water path 3 is the cooling water supply pipe. The flow rate of the cooling water flowing from the 20 into the cylinder block cooling water passage 4 is increased.

A cooling water pipe 13 is connected to the outside of the engine on the downstream side of the cylinder head cooling water path 3, and a cooling water pipe 14 is connected to the outside of the engine on the downstream side of the cylinder block cooling water path 4. On the other end side (downstream side) of 13 and 14, the radiator 5 is connected via the cooling water pipes 30 and 31. In addition, when the reserver 26 is connected to the upper portion of the radiator 5 through an overflow hose 25, and the air is contained in the cooling water introduced into the radiator 5, the air is bubbled. It moves to the upper part of a radiator, and is discharged to the reserver 26 through the overflow hose 25 from there.

On the other end side of the cooling water pipes 13 and 14, the thermostat 6 is further connected through the cooling water pipes 27 and 28, and the cooling water pipe 15 connected to the radiator 5 outlet is also connected to the thermostat 6. ) The cooling water pipe 13 connecting the cylinder head cooling water path 3 and the radiator 5 is branched from an upstream side of the cooling water pipe 27 connected to the other end side of the cooling water pipe 13 to open the heater 8. It is connected to the cooling water pipe 16 connected to the downstream side of the thermostat 6 via this, and the said cooling water pipe 16 is connected to the water pump 7 suction port side.

The thermostat 6 is opened when the temperature of the cooling water is lower than or equal to a predetermined value, and the cooling water flowing out of the engine is cooled by the cooling water pipes 13 and 14, the cooling water pipes 27 and 28, and the cooling water during normal operation described later. The radiator 5 returns to the water pump 7 without passing through the radiator 5 in the order of the tube 16, and the radiator in the order of the coolant pipe 13, the coolant pipe 27, and the coolant pipe 16 at the time of engine start-up described later. Return to the water pump without passing through (5).

On the other hand, when the cooling water is larger than the predetermined temperature, the thermostat 6 is closed, and during normal operation described later, the cooling water pipes 13 and 14, the cooling water pipes 30 and 31, the radiator 5, and the cooling water pipe 15 ), The cooling water is returned to the water pump 7 through the radiator 5 in the order of the cooling water pipe 16, and the cooling water pipe 13, the cooling water pipe 30, the radiator 5, The cooling water temperature is lowered by the action of the radiator 5 by returning the cooling water to the water pump 7 via the radiator 5 in the order of the cooling water pipe 15 and the cooling water pipe 16.

That is, when the temperature of cooling water is below a predetermined value, the cooling water flows without passing through the radiator 5, and when the cooling water temperature is larger than the predetermined value, the thermostat 6 flows the cooling water through the radiator 5. By the operation of the flow path of the coolant is switched.

The cooling water pipe 14 connected to the downstream side of the cylinder block cooling water passage 4 is provided with a control valve 10 composed of an electromagnetic valve for opening and closing the cooling water pipe 14, and the control valve 10 Opening and closing control is performed by the valve controller 11 which is a controller. The outflow adjustment device comprising the control valve 10 and the valve controller 11 restricts the outflow of the cooling water from the cylinder block cooling water path 4 to the cooling water pipe 14. In addition, the control valve 10 does not necessarily need to be a solenoid valve, and may be a valve opening / closing driven by an electric motor.

In the cooling device of an internal combustion engine for a vehicle having such a configuration, the valve controller 11 opens the control valve 10 when the coolant temperature is higher than a predetermined value during engine normal operation. As a result, as shown in FIG. 1, most of the cooling water discharged from the water pump 7 flows into the cylinder head cooling water passage 3 through the cooling water inlet pipe 18 and is discharged from the water pump 7. A part of the cooled water passes through the cooling water supply passage 20 and flows into the cylinder block cooling water passage 4.

As mentioned above, since the flow path area of the cooling water inlet pipe 18 is formed sufficiently large as compared with the flow path area of the cooling water supply path 20, the cooling water supplied from the water pump 7 to the cylinder head cooling water path 3. The flow rate of is larger than the flow rate of the cooling water supplied from the water pump 7 to the cylinder block cooling water passage 4.

The coolant flowing into the cylinder head cooling water passage 3 flows through the cylinder head cooling water passage 3 to cool the cylinder head 1, and then flows out from the cooling water pipe 13 to the outside of the engine (first cooling). System), thermostat (6) or radiator (5). At this time, the cylinder block 2 is provided below the cylinder head 1, and downward gravity from the cylinder head 1 to the cylinder block 2 side acts on the cooling water flowing through the cooling water passage, and the cylinder Since the flow rate of the cooling water flowing into the head cooling water passage 3 is higher than the flow rate of the cooling water flowing into the cylinder block cooling water passage 4, the pressure in the cylinder head cooling water passage 3 is increased in the cylinder block cooling water passage 4. A portion of the cooling water that is higher than the pressure and supplied to the cylinder head cooling water passage 3 flows downwardly to the cylinder block cooling water passage 4 through the connecting portion 23 as shown by the arrow in FIG. After cooling the cylinder block 2 by flowing the cylinder block cooling water passage 4, it is sent out to the outside of the engine through the cooling water pipe 14 (second cooling system).

In addition, a part of the cooling water sent from the water pump 7 passes through the cooling water supply path 20, flows into the cylinder block cooling water passage 4, and merges with the cooling water from the cylinder head cooling water passage 3. After that, the cylinder block cooling water passage 4 flows through the cooling water pipe 14 and flows out of the engine (third cooling system). The coolant flowing out of the cylinder head cooling water passage 3 to the outside of the engine and the cooling water flowing out of the cylinder block cooling water passage 4 to the outside of the engine are the outlet side of the cylinder head cooling water passage 3 and the cylinder block cooling water passage 4. One end is respectively connected to the outlet side of the water pump, and the water pump 7 is returned to the water pump 7 through an external flow passage composed of a plurality of cooling water pipes connected to the suction end of the water pump 7.

As described above, in normal operation, the first cooling state is formed by the first cooling system, the second cooling system, and the third cooling system. That is, cooling water flows into the cylinder head cooling water passage 3 from the water pump 7, and a part of the cooling water flows from the cylinder head cooling water passage 3 through the connecting portion 23 to the cylinder block cooling water passage 4. Since the furnace cooling water flows, the cooling water that flows into the cylinder block cooling water passage 4 and becomes relatively high temperature does not flow into the cylinder head cooling water passage 3. Therefore, the cooling of the cylinder head 1 is promoted, and with this, cooling around the intake port formed in the cylinder head is performed effectively, and the volume efficiency of intake air rises, and engine performance can be improved.

In addition, the amount of cooling water flowing from the water pump 7 through the cooling water inlet pipe 18 into the cylinder head cooling water passage 3 is transferred from the water pump 7 to the cylinder block cooling water passage through the cooling water supply passage 20 ( Since it is comprised so that it may become large enough compared with the quantity of cooling water which flows into 4), the cooling of the cylinder head 1 is further accelerated and the engine performance can be improved further.

In addition, since the coolant having a relatively high temperature flows into the cylinder block cooling water passage 4, the supercooling of the cylinder block 2 is avoided and is not illustrated in the cylinder block 2. The increase in friction between the cylinder and the piston is prevented.

On the other hand, when the coolant temperature is lower than or equal to a predetermined value at the start of the engine, the control valve 10 is closed by the valve controller 11 so that the flow of coolant in the coolant pipe 14 is restricted, so that the cylinder block coolant Cooling water in (4) passes through the cooling water pipe (14), and it hardly flows out to the external flow path outside the engine.

This stops the flow of the cooling water from the cylinder head cooling water passage 3 to the cylinder block cooling water passage 4 via the connecting portion 23, while supplying the cooling water from the water pump 7 as shown by the arrow in FIG. The cooling water supplied to the cylinder block cooling water passage 4 through the furnace 20 flows upwardly from the cylinder block cooling water passage 4 to the cylinder head cooling water passage 3 through the connecting portion 23, and the water pump ( 7) merges with the cooling water sent to the cylinder head cooling water passage (3), flows into the cylinder head cooling water passage (3), flows out of the engine (fourth cooling system), and passes through the cooling water pipe (13). It is sent to a thermostat (6) or a radiator (5). In this way, when the control valve 10 is closed to restrict the outflow of the coolant flowing in the cylinder block cooling water to the outside of the engine, the cooling water discharged from the water pump 7 is the cylinder head cooling water passage 3. After the inside flows, a second cooling state is formed by the above-described first cooling system and the fourth cooling system which flow out from the cooling water pipe 13 to the outside of the engine.

That is, in the second cooling state, part of the cooling water discharged from the water pump 7 flows upward from the cylinder block cooling water passage 4 toward the cylinder head cooling water passage 3. For this reason, even if an air stagnation part is generated in the vicinity of the connecting portion 23 between the cylinder head cooling water passage 3 and the cylinder block cooling water passage 4, the direction of buoyancy acting on the air and the flow direction of the cooling water are substantially the same. The air is discharged to the outside of the engine through the upper cylinder head cooling water path 3 together with the cooling water without being impeded by the buoyancy acting on the air.

Therefore, according to this embodiment, the cooling water supply passage 20 connected to the discharge-side cylinder block cooling water passage 4 of the water pump 7 is provided, and the cooling water pipe 14 connected to the cylinder block cooling water passage 4 is provided. In the extremely simple configuration of restricting the coolant flowing out from the cylinder block cooling water channel 4 to the cooling water pipe 14 by the control valve 10 provided in the above), the cooling water is connected to the connecting portion 23 from the cylinder block cooling water channel 4 side. Flows upward through the cylinder head cooling water passage (3). Air remaining in the vicinity of the connecting portion 23 can be discharged to the outside of the engine.

Thereby, the rapid temperature rise of the cylinder block 2 which arises with generation | occurrence | production of the said air stagnation part can be prevented, the cooling effect of the cylinder block 2 can be improved, and generation | occurrence | production of thermal deterioration can be prevented.

In the present embodiment, since the temperature of the coolant in which the thermostat 6 is switched from the open state to the closed state and the temperature of the coolant in which the control valve 10 is switched from the closed state to the open state are almost equal, The air discharged to the gas is accumulated near the thermostat 6 or the radiator 5 while the thermostat 6 is open, and stagnated near the radiator 5 when the thermostat 6 is closed. The collected air flows into the radiator 5 together with the cooling water and is discharged from the upper portion of the radiator 5 to the reserver 26 through the overflow hose 25.

In addition, in the above-mentioned embodiment, when the cooling water temperature at the time of engine start or the like is below a predetermined value, the control valve 10 is closed to shut off the cooling water pipe 14 to draw out air, but the valve controller 11 The control valve 10 may be closed arbitrarily by operating manual).

Like the cooling apparatus of the internal combustion engine in the present embodiment, the cooling water discharged from the water pump 7 is supplied to the cylinder head cooling water passage 3, and the cylinder from the cylinder head cooling water passage 3 through the connecting portion 23. In the cooling apparatus of the system which supplies cooling water to the block cooling water path 4, especially when the said cooling water is filled by cooling water exchange etc., cooling water is discharged from the cylinder head cooling passage 3 through the connection part 23 via the cylinder block cooling passage ( When it flows into 4), air congestion is likely to occur especially near the connecting portion 23 between the cylinder head cooling water passage 3 and the cylinder block cooling water passage 4. Therefore, after the coolant is replaced, the valve controller 11 is operated manually to close the control valve 10 so that air extraction as described above can be performed to reliably discharge the air remaining in the vicinity of the connecting portion 23 to the outside of the engine. Can be.

In addition, the opening / closing state of the control valve 10 in the above-described embodiment can be set arbitrarily, and the flow path area of the cooling water pipe 14 is appropriately changed to allow the engine to pass through the cooling water pipe 14 from the cylinder block 2. It is good also as a structure which can adjust the flow volume of the cooling water which flows out. In this case, the flow rate ratio of the cooling water flowing through the cylinder head cooling water passage 3 and the cylinder block cooling water passage 4 can be arbitrarily changed by adjusting the flow rate of the cooling water flowing out of the cylinder block 2 according to the operating state of the engine. Therefore, the cooling effect of the engine by the cooling water can be further improved.

In addition, the control valve 10 may be configured as a thermostat for opening and closing the cooling water pipe 14 by the cooling water outlet temperature of the engine, that is, the cooling water temperature passing through the cooling water pipe 14. In this case, when the temperature of the coolant flowing through the coolant pipe 14 is lower than the predetermined temperature, the thermostat is set so as to close the coolant pipe 14 so that the air stagnant portion near the connecting portion 23 is relatively simple. Can be discharged outside the engine. In addition, the switching temperature of a thermostat may be set to below the switching temperature of the thermostat 6 provided in the external flow path, and may set a value larger than the switching temperature of the thermostat 6.

As another modification, the coolant supply passage 20 is provided with a shutoff valve that is an inflow control device capable of blocking the supply from the water pump 7 to the cylinder block cooling water passage 4 and closes the control valve 10. Only when the outflow of the cooling water from the cooling water pipe 14 is blocked or suppressed, the operation of the shutoff valve is released, and the cylinder block cooling water path 4 from the water pump 7 through the cooling water supply path 20. It is good also as a structure which supplies a cooling water with the furnace. In this case, the passage area of the cooling water inlet pipe 18 does not necessarily need to be larger than the passage area of the cooling water supply path 20, and design freedom is improved.

In addition, the control valve 10 does not necessarily need to be provided in the cooling water pipe 14, but is provided at the most downstream of the cylinder block cooling water passage 4 to restrict the flow of cooling water from the cylinder block 2 to the outside of the engine. You may also do it. In addition, the said shut-off valve does not necessarily need to be provided in the cooling water supply path 20, but may be provided in the most upstream of the cylinder block cooling water path 4. As shown in FIG.

In addition, the cylinder block 2 does not necessarily need to be provided directly under the cylinder head 1, and the cylinder block 2 may be provided obliquely below the cylinder head 1. That is, when the coolant flows from the cylinder block cooling water passage 4 toward the cylinder head cooling water passage 3, the buoyancy force acting on the air staying near the connecting portion 23 causes the movement of the air in the flow direction. Unless the direction is inhibited, the same effects as in the above embodiments are achieved.

In addition, the cooling water temperature at which the control valve 10 is switched from the closed state to the open state is not limited to being set to be almost the same as the cooling water temperature at which the thermostat 6 is switched from the open state to the closed state as in the above embodiment. The thermostat 6 may be set lower than the cooling water temperature at which the thermostat 6 is switched from the open state to the closed state, and conversely, the thermostat 6 may be set higher than the cooling water temperature at which the thermostat 6 is switched from the open state to the closed state.

The case where the cooling water temperature at which the control valve 10 is switched from the closed state to the open state is set to be higher than the cooling water temperature at which the thermostat 6 is switched from the open state to the closed state. In addition, the structure like the said embodiment abbreviate | omits the detailed description.

In this case, when the thermostat 6 is in an open state, one end is respectively provided on the other end side (downstream side) of the cooling water pipe 13 which is the first cooling water outflow passage and the cooling water pipe 14 which is the second cooling water outlet passage. The 2nd external channel which connects and the other end is connected to the suction side of the water pump 7 by bypassing the radiator 5 is formed. Specifically, the second external water passage is provided on the downstream side of the cooling water pipes 27 and 28, the thermostat 6, and the thermostat 6 respectively connected to the other ends of the cooling water pipes 13 and 14, respectively. It is comprised by the cooling water pipe 16 which one end was connected and the other end was connected to the suction side of the water pump 7.

On the other hand, when the thermostat 6 is switched from the open state to the closed state, one end is connected to the other end side of the cooling water pipe 13 and the cooling water pipe 14 from the second external water channel, respectively, and the radiator 5 The flow path of the cooling water is switched to the first external water channel, the other end of which is connected to the suction side of the water pump 7 via the pump. Specifically, the first external water path includes the coolant pipes 30 and 31, the radiator 5, the coolant pipe 15, the thermostat 6, and the coolant pipes 13 and 14 connected to the other ends of the coolant pipes 13 and 14, respectively. It is comprised by the cooling water pipe 16.

As mentioned above, the 1st external channel and the 2nd external channel are switched by the thermostat 6 which is a path switching device. In the present embodiment, the first external channel and the second external channel are configured to overlap each other in the cooling water pipe 16, thereby simplifying the channel.

Therefore, the control valve 10 is opened from the closed state rather than the temperature (first predetermined value) of the cooling water in which the thermostat 6 is switched from the open state to the closed state and is switched from the second external water channel to the first external water channel. The control valve 10 is closed by setting the temperature (second predetermined value) of the cooling which is converted to the normal operation state to a large value, and the coolant containing air in the vicinity of the connecting portion 23 is connected to the cooling water pipe 13. When it flows out into the 1st external water, time exists in which I was formed, As a result, this cooling water flows into the radiator 5 provided in the 1st external flow path, and the air contained in the said cooling water is radiated ( 5) It can be surely discharged to the reserver 26 through the overflow hose 25 from the top.

According to the present invention as described above, an outflow adjusting device provided between the second supply passage having one end connected to the discharge side of the water pump and the other end connected to the cylinder block cooling water passage, and the cylinder block cooling water passage and the external flow path. And closing the outflow control device so that coolant flows from the second supply passage to the cylinder block cooling water and through the connecting portion to the cylinder head cooling water passage, thereby generating the air stagnant portion near the connecting portion of a relatively simple configuration. Together with the coolant, it can be discharged from the cylinder head coolant to the outside of the engine.

Claims (10)

A cylinder head cooling water passage formed in the cylinder head, A first supply passage having one end connected to the discharge side of the water pump and the other end connected to the cylinder head cooling water passage; A cylinder block cooling water passage formed in the cylinder block provided below the cylinder head; A connection portion connecting the cylinder head cooling water passage and the cylinder block cooling water passage; A cooling apparatus of an internal combustion engine having an external flow path having one end connected to the cylinder head cooling water passage and the cylinder block cooling water passage, respectively, and the other end connected to the suction side of the water pump. A second supply passage having one end connected to the discharge side of the water pump and the other end connected to the cylinder block cooling water passage; It is provided with an outflow adjustment device provided between the cylinder block cooling water passage and the outer passage, By closing the outflow regulator, coolant flows from the second supply path to the cylinder block cooling water and through the connection portion to the cylinder head cooling water. The method of claim 1, The flow rate of the said 1st supply path is larger than the flow volume of a said 2nd supply path, The cooling apparatus of the internal combustion engine. The method of claim 1, The second supply passage is provided with an inlet regulator for restricting the inflow of the cooling water from the second supply passage to the cylinder block cooling water passage is provided. The method of claim 1, The outflow control device is a cooling device of an internal combustion engine, characterized by comprising a control valve provided between the cylinder block cooling water path and the external flow path, and a controller for controlling the opening and closing state of the control valve. The method of claim 4, wherein And the controller is capable of controlling the control valve to restrict the outflow of the cooling water from the cylinder block cooling water path to the external flow path when the temperature of the cooling water is below a predetermined value. The method of claim 4, wherein The control valve is a cooling apparatus of the internal combustion engine, characterized in that the operation can be opened and closed arbitrarily by operating the controller. The method of claim 1, Cooling device of the internal combustion engine, characterized in that the outflow regulator is composed of a thermostat. A cylinder head cooling water passage formed in the cylinder head, A first supply passage having one end connected to the discharge side of the water pump and the other end connected to the cylinder head cooling water passage; A first cooling water outlet passage having one end connected to the cylinder head cooling passage; A cylinder block cooling water passage formed in the cylinder block provided below the cylinder head; A second cooling water outlet path having one end connected to the cylinder block cooling water path; A connection portion connecting the cylinder head cooling water passage and the cylinder block cooling water passage; A first external channel having one end connected to the other end of the first coolant outlet and the other end of the second coolant outlet, and the other end connected to the water pump suction side through a radiator; A second external channel having one end connected to the other end of the first coolant outlet and the other end of the second coolant outlet, respectively, and the other end connected to the water pump suction side by bypassing the radiator; A reserver connected to an upper portion of the cooling water cooling device; In the cooling apparatus of the internal combustion engine which has the path | route switching apparatus which switches a flow path of a cooling water from a said 2nd external channel to said 1st external channel, when the temperature of the said cooling water becomes more than a 1st predetermined value, A second supply passage having one end connected to the discharge side of the water pump and the other end connected to the cylinder block cooling water passage; An outflow adjusting device provided between the cylinder block cooling water passage and the second cooling water outlet passage; By closing the outflow control device until the temperature of the cooling water becomes equal to or greater than the second predetermined value larger than the first predetermined value, the cooling water is discharged from the second supply path to the cylinder block cooling water and through the connecting portion, the cylinder head. Cooling apparatus of the internal combustion engine, characterized in that flow to the cooling water passage. The cooling water discharged from the water pump flows into the cylinder head cooling water and flows out of the engine, and a portion of the cooling water flowing into the cylinder head cooling water flows into the lower cylinder block cooling water through the connection part. And a first cooling system configured to circulate the cooling water by a second cooling system flowing out of the engine, and a cooling water discharged from the water pump flows into the cylinder block cooling water and flows into the outside of the engine; A circulating coolant by the first cooling system and a fourth cooling system flowing into the cylinder block cooling water through the connection part, into the cylinder head cooling water through the connection part, and out of the engine; 2 cooling system, Cooling device of the internal combustion engine, characterized in that by switching off the third cooling system, switching from the first cooling state to the second cooling state. The method of claim 9, And a cooling water flow rate flowing directly from the water pump into the cylinder head cooling water flow is larger than a cooling water flow rate flowing directly from the water pump into the cylinder block cooling water flow path.