JP5494357B2 - Cooling device for internal combustion engine - Google Patents

Description

  The present invention relates to a cooling device for an internal combustion engine.

  In general, the internal combustion engine and its peripheral devices at a cold start are in a low temperature state, and the intake air passing through the throttle valve is adiabatically expanded downstream of the throttle valve, so that the throttle valve is cooled and icing occurs. In order to prevent such icing, part of the engine coolant is introduced into the throttle body during the warm-up operation to prevent icing in the throttle valve (see, for example, Patent Document 1).

  However, when the internal combustion engine starts operating for a while, the cooling water becomes hot, and if the cooling water continues to be supplied to the throttle body, the throttle body also becomes hot, and the intake air passing through the throttle valve is heated to expand its volume. This causes the filling efficiency to decrease. For this reason, generally, a valve device (hereinafter also referred to as “throttle body valve device”) for reducing or stopping the coolant supplied to the throttle body as the coolant temperature increases is provided in the coolant channel. .

JP 2002-097957 A Japanese Patent Laid-Open No. 5-86970

  By the way, a cooling device for an internal combustion engine has been proposed in which cooling water is circulated in parallel with respect to a water jacket of a cylinder head and a water jacket of a cylinder block (see, for example, Patent Document 2). This type of internal combustion engine cooling device includes a valve device (hereinafter also referred to as “cylinder block valve device”) for stopping only the circulation of the cooling water in the water jacket of the cylinder block. When the internal combustion engine is cold-started, only the cooling water in the water jacket of the cylinder head is circulated while the circulation of the cooling water in the water jacket of the cylinder block is stopped by the above valve device. The friction loss is reduced to improve fuel efficiency.

  In such a cooling device for an internal combustion engine, a throttle body valve device for introducing a part of engine cooling water into the throttle body and reducing or stopping the cooling water supplied to the throttle body as the cooling water temperature increases is provided. There is something to prepare.

  However, the cooling device for an internal combustion engine that includes both the cylinder block valve device and the throttle body valve device may increase the number of parts and increase the complexity of the configuration of the cooling device due to an increase in the number of valve devices. is there.

  The present invention was devised in view of such a problem, and in a cooling device for an internal combustion engine including both a cylinder block valve device and a throttle body valve device, the two valve devices are integrated into a component. An object of the present invention is to provide a cooling device for an internal combustion engine that reduces the number of points and facilitates simplification of the configuration of the cooling device.

  As means for solving the above-described problems, the internal combustion engine cooling apparatus of the present invention is configured as follows.

  That is, the cooling device for an internal combustion engine of the present invention includes a water jacket in the block formed in the cylinder block, a water jacket in the head formed in the cylinder head, the water jacket in the block, and the water jacket in the head. The cooling water flow path for circulating the cooling water in parallel and the cooling water circulation in the water jacket in the block can be stopped while the cooling water in the water jacket in the head is circulated. And a cooling water flow path for the device to be heated for circulating the cooling water to the device to be heated, the valve device being in the water jacket in the block in the closed state. The cooling water circulation in the block is stopped and the water jacket in the block is cooled in the valve open state. A first valve body that allows the circulation of the first valve body, and a side that is closed from the side that opens the cooling water flow path for the device to be heated in conjunction with the operation from the valve closing side to the valve opening side of the first valve body An interlocking member that operates from a side that closes the cooling water flow path for the device to be heated to a side that opens, in conjunction with the operation from the valve opening side to the valve closing side of the first valve body, It is characterized by having.

  According to the cooling apparatus for an internal combustion engine having such a configuration, the cooling water temperature in the water jacket in the block is stopped while the cooling water in the water jacket in the head is circulated, and the water temperature of the cooling water is The valve device for reducing or stopping the cooling water supplied to the equipment to be heated is integrated into a single valve device when the temperature is increased, reducing the number of parts (number of valve devices) and simplifying the configuration of the cooling device Become.

  The valve device is, for example, a thermostat valve including the first valve body and a case containing a thermal expansion body that moves integrally with the first valve body, and the interlocking member is the case. is there.

  The valve device includes, for example, the first valve body, a case incorporating a thermal expansion body that moves integrally with the first valve body, a second valve body that moves integrally with the case, And the interlocking member is the second valve body.

  Preferably, the first valve body opens and closes a cooling water outlet of the water jacket in the block, and the case opens and closes a cooling water inlet of the cooling water flow path for the device to be heated. Yes, the cooling water outlet of the water jacket in the block and the cooling water inlet of the cooling water flow path for the device to be heated are opposed to each other.

  Preferably, the first valve body opens and closes a cooling water outlet of the water jacket in the block, and the second valve body opens a cooling water inlet of the cooling water passage for the device to be heated. The cooling water outlet of the water jacket in the block and the cooling water inlet of the cooling water flow path for the device to be heated are opposed to each other.

  The said heating object apparatus is a throttle body, a heater core, etc., for example.

  According to the cooling apparatus for an internal combustion engine of the present invention, a valve device for stopping the circulation of the cooling water in the water jacket in the block while the cooling water in the water jacket in the head is circulated, and the temperature of the cooling water is high. If it becomes, the valve apparatus for reducing or stopping the cooling water supplied to a heating object apparatus will be integrated in one valve apparatus. Thereby, the number of parts (the number of valve devices) is reduced, and the configuration of the cooling device is easily simplified.

It is a schematic diagram which shows the path | route through which cooling water circulates within an engine. It is a circulation circuit diagram of the cooling water in the cooling device of an engine. It is a figure equivalent to the AA cross section of the cylinder head of FIG. 1, Comprising: It is a figure which shows structural examples, such as a specific head side water jacket. It is the B section enlarged view of FIG. It is a figure which shows the site | part corresponding to FIG. 4, Comprising: It is a figure which shows the example at the time of employ | adopting a bottom bypass type thermostat valve as a 1st thermostat valve. It is a circulation circuit diagram of the cooling water which concerns on other embodiment.

  Hereinafter, a cooling device for an internal combustion engine according to an embodiment of the present invention will be described with reference to the drawings. As an internal combustion engine in the present embodiment, an in-line four-cylinder engine will be described as an example. FIG. 1 is a schematic diagram showing a path through which cooling water circulates in the engine 10. FIG. 2 is a circuit diagram of an engine cooling device.

  As shown in FIGS. 1 and 2, the engine 10 includes a water jacket 21 formed in the cylinder block 20 (hereinafter also referred to as “in-block water jacket 21”) and a water jacket formed in the cylinder head 30. 31 (hereinafter also referred to as “in-head water jacket 31”). In FIG. 1, the water jacket 31 in the head is not shown.

  Cooling water discharged from the water pump 40 is introduced from the cooling water inlet 22 of the cylinder block 20 to the front portion of the water jacket 21 in the block (around the cylinder 51 arranged at one end position in the cylinder arrangement direction). The introduced cooling water is diverted in front of the cylinder 51 when a first thermostat valve 70, which will be described later, is open, a part of which flows in the water jacket 21 in the block, and the remaining part is in the water in the head. It flows to the jacket 31 side.

  The cooling water flowing through the water jacket 21 in the block flows from the front (one side) to the rear (the other side) in the cylinder arrangement direction along both sides of each of the cylinders 51 to 54, as indicated by arrows 91 and 92. Merge after 54. The cooling water that has reached the rear of the cylinder 54 has a communication passage 62 formed of a through hole formed in the gasket 60 interposed between the cylinder block 20 and the cylinder head 30 and a guide passage 32 formed in the cylinder head 30. (See FIG. 2) and the coolant that has passed through the water jacket 31 in the head merges at a junction 39 formed in the cylinder head 30.

  Cooling water introduced from the cooling water introduction port 22 to the front portion of the water jacket 21 in the block is supplied to the in-head water jacket 31 through a communication passage 61 formed of a through hole formed in the gasket 60. Then, as shown by an arrow 93 (see FIG. 1), the cooling water in the in-head water jacket 31 is approximately along the combustion chamber walls of the cylinders 51 to 54 in the cylinder arrangement direction from the front (one side) to the rear (the other side). It flows toward. The cooling water that has passed through the in-head water jacket 31 merges with the cooling water supplied from the in-block water jacket 21 through the guide channel 32 at the junction 39 if a first thermostat valve 70 described below is in an open state. Then, it flows into one of the first cooling water flow path 45 and the second cooling water flow path 46 provided in parallel to each other downstream of the water jackets 21 and 31, and is led out of the cylinder head 30.

  Thus, by providing the cooling water inlet 22, the communication passages 61 and 62, the first and second cooling water flow paths 45 and 46, etc. around the water jacket 21 in the block and the water jacket 31 in the head, Cooling water can circulate in parallel between the water jacket 20 in the block and the water jacket 30 in the head. In order to supply cooling water from the water jacket 21 in the block to the water jacket 31 side in the head, through holes serving as communication paths 61 and 62 are formed in the gasket 60. A small air vent may be formed so that a small amount of cooling water flows from the water jacket 21 in the block toward the water jacket 31 in the head.

  In the first cooling water flow path (cooling water flow path for the device to be heated) 45, a heater core 44 used for heating the vehicle interior and a throttle body 49 having a throttle valve are mutually connected as a heating target device with cooling water. Installed in parallel. The cooling water supplied to the heater core 44 and the throttle body 49 is returned to the water pump 40 via the second thermostat valve 43.

  The cooling water inlet 452 of the first cooling water channel 45 faces the outlet of the guide channel 32, and the first thermostat valve 70 is installed therebetween.

  A radiator 42 is installed in the second cooling water channel 46. The cooling water supplied to the radiator 42 is circulated while dissipating heat in the radiator 42, and then returned to the water pump 40 via the second thermostat valve 43.

  The 1st thermostat valve 70 is provided so that the guide flow path 32 used as the exit of the cooling water of the water jacket 21 in a block may be opened and closed. The first thermostat valve 70 is closed when the valve element 71 is lower than the water temperature Tc (for example, Tc = 87 ° C.), opened at the water temperature Tc or higher, and fully opened at the water temperature Tcw (for example, Tcw = 100 ° C.) or higher. It becomes. That is, when the cooling water in the vicinity of the first thermostat valve 70 is lower than the predetermined water temperature Tc, the guide passage 32 is closed by the valve body 71, and the circulation of the cooling water in the water jacket 21 in the block is stopped. On the other hand, the coolant in the head water jacket 31 circulates as long as the water pump 40 is driven regardless of the state of the first thermostat valve 70.

  Further, the second thermostat valve 43 is closed when the cooling water is lower than a predetermined water temperature Tw (for example, Tw = 82 ° C.), and stops the circulation of the cooling water in the radiator 42. On the other hand, when the cooling water is equal to or higher than the predetermined water temperature Tw, the valve is opened and the cooling water in the radiator 42 is circulated. However, regardless of whether the second thermostat valve 43 is open or closed, the flow path of the cooling water that returns from the heater core 44 to the water pump 40 is always open.

  FIG. 3 is a view corresponding to the AA cross section of the cylinder head 30 of FIG. 1 and showing a specific structural example of the water jacket 31 in the head. For convenience of explanation, the upstream side of the cooling water flowing in the head water jacket 31 is referred to as “front” of the engine 10, and the downstream side is referred to as “rear” of the engine 10. Also, the direction from which exhaust gas is discharged from the exhaust port is referred to as “exhaust side”, and the direction from which fresh air is drawn from the intake port is referred to as “intake side”.

  As shown in FIG. 3, the in-head water jacket 31 extends in the cylinder arrangement direction in the cylinder head 30. A communication passage 61 communicating with the water jacket 21 in the block is formed at the front end of the water jacket 31 in the head, and cooling water flows into the water jacket 31 in the head from the water jacket 21 in the block through the communication passage 61. To do. The rear end portion of the in-head water jacket 31 communicates with a first cooling water passage 45 and a second cooling water passage 46 that are outlet pipes connected to the cylinder head 30.

  The cooling water supplied from the in-block water jacket 21 into the cylinder head 30 through the rear side communication passage 62 is guided rearward by the guide flow path 32 provided continuously from the communication passage 62, and the water jacket in the head. The cooling water that has passed through 31 is merged at the merge section 39 and flows into the first or second cooling water flow paths 45 and 46.

  Reference numeral 34 denotes an exhaust port passage, reference numeral 35 denotes an intake port passage, and reference numeral 36 denotes a spark plug opening.

  Hereinafter, the first thermostat valve 70 will be described in more detail.

  As shown in FIG. 4, the first thermostat valve 70 includes a valve body 71, a wax case 72, a flange portion 73, a piston element 74, a spring 78, etc., and the flange portion 73 is inside the cylinder head 30 via a seal member 731. It is being fixed to the flange mounting surface 37 provided in.

  The wax case 72 is supported in a case supporting portion 76 fixed to the flange portion 73 so as to be slidable in the axial direction of the piston element 74. In the wax case 72, a wax as a thermal expansion body that expands and contracts in response to the temperature of the cooling water around the wax case 72 is built-in. Further, in the wax case 72, a piston is interposed via the wax. The base end side of the element 74 is accommodated. The wax case 72 illustrated in FIG. 4 is formed in a cylindrical shape with the piston element 74 as the center.

  The tip of the piston element 74 is fixedly supported by a piston support portion 77 fixed to the flange portion 73.

  The valve body 71 is fixed to the wax case 72 and moves together with the wax case (interlocking member) 72. The valve body 71 is seated on a valve seat surface 75 formed on the inner peripheral side of the flange portion 73 to be in a valve-closed state, and closes the guide channel 32. On the other hand, the valve is separated from the valve seat surface 75 to be opened, and the guide channel 32 is opened.

  The spring 78 biases the valve element 71 in a direction to press the valve seat 71 against the valve seat surface 75. As the spring 78, a compression coil spring interposed between the back surface of the valve body 71 and the case support portion 76 in a compressed state is used.

  When the temperature of the cooling water around the wax case 72 is lower than the predetermined water temperature Tc, the valve element 71 is pressed against the valve seat surface 75 by the spring 78 to be closed, and the guide channel 32 is closed. At this time, the wax case 72 that moves integrally with the valve body 71 is also arranged on the same side, and the wax case 72 is positioned away from the cooling water inlet 452 of the first cooling water channel 45 (see FIG. 4A).

  On the other hand, when the coolant temperature around the wax case 72 is equal to or higher than the predetermined water temperature Tc, the valve element 71 moves away from the valve seat surface 75 against the urging force of the spring 78 and enters the valve open state. The guide channel 32 is opened. At this time, the wax case 72 that moves together with the valve body 71 also moves in the same direction, and approaches the cooling water inlet 452 of the first cooling water passage 45 to reduce the flow rate of the cooling water flowing from the cooling water inlet 452. To do. When the cooling water temperature around the wax case 72 becomes higher than the predetermined water temperature Tcw and the volume expansion of the wax in the wax source 72 reaches a certain level, the wax case 72 is shown in FIG. In addition, the cooling water inlet 452 of the first cooling water channel 45 is closed.

  That is, in the first thermostat valve 70, the wax case 72 moves from the opening side of the first cooling water passage 45 to the closing side in conjunction with the operation from the valve closing side to the valve opening side of the valve element 71, In conjunction with the operation of the valve body 71 from the valve opening side to the valve closing side, the wax case 72 moves from the side that closes the first cooling water passage 45 to the side that opens.

  Reference numeral 451 denotes an expansion formed by expanding the wax case 72 from the original inner diameter of the first cooling water channel 45 so that the wax case 72 can be fitted into the cooling water inlet 452 of the first cooling water channel 45 (gap fitting). It is a diameter part. In addition, when the outer diameter of the wax case 72 has a dimensional relationship that allows a clearance to be fitted to the inner diameter of the cooling water inlet 452 of the first cooling water channel 45, the above is placed in the cooling water inlet 452 of the first cooling water channel 45. There is no need to provide the enlarged diameter portion 451.

  In the engine cooling apparatus according to the present embodiment having the above-described configuration, when the temperature of the cooling water flowing in the water jacket 31 in the head is lower than the predetermined water temperature Tw, such as when the engine is cold started, The second thermostat valves 70 and 43 are closed, and only the cooling water in the head water jacket 31 is circulated while the circulation of the cooling water in the block water jacket 21 is stopped. Thereafter, when the temperature of the cooling water rises and the temperature of the cooling water flowing in the in-head water jacket 31 becomes equal to or higher than a predetermined water temperature Tw, the second thermostat valve 43 is opened and the cooling that has passed through the in-head water jacket 31 is performed. Water flows through both the first cooling water channel 45 and the second cooling water channel 46.

  Further, when the temperature of the cooling water flowing through the water jacket 31 in the head rises and becomes equal to or higher than a predetermined water temperature Tc, the first thermostat valve 70 is also opened, and the cooling water that has passed through each of the water jackets 21 and 31 is the first. And it comes to flow into the 2nd cooling water flow paths 45 and 46. At this time, the valve body 71 of the first thermostat valve 70 starts to move away from the valve seat surface 75, and the wax case 72 closes the cooling water inlet 452 of the first cooling water passage 45 according to the degree of increase in the cooling water temperature. The flow rate of the cooling water flowing through the first cooling water channel 45 is reduced. When the cooling water temperature further rises to a predetermined water temperature Tcw or higher, the cooling water inlet 452 of the first cooling water passage 45 is closed by the wax case 72 as shown in FIG. The flow rate of the cooling water in the one cooling water flow path 45 is small or close to zero. As a result, the supply of cooling water to the heater core 44 and the throttle body 49 installed on the first cooling water flow path 45 is reduced or stopped, and the temperature rise of the heater core 44 and the throttle body 49 is suppressed.

-Other embodiments-
As the first thermostat valve 70 in the above-described embodiment, a bottom bypass type thermostat valve 70A as shown in FIG. 5 may be adopted. Hereinafter, the same components as those of the first thermostat valve 70 described above are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

  The bottom bypass thermostat valve 70A illustrated in FIG. 5 is a bottom bypass on the opposite side of the wax case 72 from the piston element 77 (that is, the cooling water inlet 452 side of the first cooling water passage 45) in the above-described thermostat valve 70. A valve (interlocking member) 79 is provided. The bottom bypass valve 79 includes a valve body 791 that can close the cooling water inlet 452 of the first cooling water passage 45, a valve shaft 792 that slidably supports the valve body 791, a back portion of the valve body 791, and a wax. And a spring 83 interposed between the end of the case 72 in a compressed state. Note that a locking portion 792a for preventing the valve body 791 from dropping off is formed at the tip of the valve shaft 792.

  Similarly, when the bottom bypass type thermostat valve 70A is employed, when the temperature of the cooling water flowing through the water jacket 31 in the head becomes equal to or higher than a predetermined water temperature Tc, the valve body 71 of the first thermostat valve 70A becomes the valve seat surface. While starting to move away from 75, the wax case 72 moves to the cooling water inlet 452 side of the first cooling water flow path 45 in accordance with the rising degree of the cooling water temperature. As a result, the valve body 791 of the bottom bypass valve 79 starts to close the cooling water inlet 452, and the flow rate of the cooling water flowing through the first cooling water flow path 45 decreases. When the coolant temperature further rises to a predetermined water temperature Tcw or more, the valve body 791 of the bottom bypass valve 79 opens the coolant inlet 452 of the first coolant channel 45 as shown in FIG. It closes, and the flow rate of the cooling water in the first cooling water channel 45 becomes a small amount or close to zero. As a result, the supply of cooling water to the heater core 44 and the throttle body 49 installed on the first cooling water flow path 45 is reduced or stopped, and the temperature rise of the heater core 44 and the throttle body 49 is suppressed.

  In the case where the coolant temperature is equal to or higher than a predetermined coolant temperature Tcw, a coolant flow path for supplying coolant exclusively to the throttle body 79 is provided if the coolant supply to the heater core 44 is not reduced and need not be stopped. The cooling water inlet of the cooling water flow path may be configured to be opened and closed by the wax case 72 and the bottom bypass valve 79 of the first thermostat valves 70 and 70A.

  For this purpose, for example, a cooling water circulation circuit as shown in FIG. 6 can be employed. In this cooling water circulation circuit, in addition to the first and second cooling water channels 45 and 46, a third cooling water channel 95 is provided as a cooling water channel that receives the supply of cooling water at the downstream end of the water jacket 31 in the head. The heater core 44 is installed in the third cooling water flow path 95. The downstream side of the third cooling water passage 95 joins the downstream side of the throttle body 49 of the first cooling water passage 45.

  According to the cooling device for an internal combustion engine described above, the valve device for stopping the circulation of the cooling water in the water jacket 21 in the block while the cooling water in the water jacket 31 in the head is circulated, and the cooling water A valve device for reducing or stopping the cooling water supplied to the throttle body 49 as the water temperature increases is integrated as one valve device (first thermostat valve 70). Thereby, the number of parts (the number of valve devices) in the cooling device of the internal combustion engine is reduced, and the configuration is simplified.

  Further, when the coolant temperature is equal to or higher than the predetermined water temperature Tcw, the coolant is supplied to the heater core 44 and the throttle body 49 by the wax case 72 of the first thermostat valve 70 and the bottom bypass valve 79 of the first thermostat valve 70A. By closing the first cooling water passage 45, the temperature rise of the heater core 44 and the throttle body 49 can be suppressed. By suppressing the temperature rise of the throttle body 49, the charging efficiency of the engine 10 is increased, and the output performance of the engine 10 can be expected to be improved. In addition, by suppressing the temperature rise of the heater core 44, the power consumed for cooling may be saved on days with relatively high temperatures, and an increase in fuel consumption may be expected.

  Moreover, since the guide flow path 32 which is the cooling water outlet of the water jacket 21 in the block and the cooling water inlet 452 of the first cooling water flow path 45 are opposed to each other, the first thermostat valves 70 and 70A are coaxially arranged. A general-purpose thermostat valve in which the valve body 71 and the wax case 72 or the valve body 71 and the bottom bypass valve 79 move on the same axis can be employed.

  Further, when the coolant temperature is equal to or higher than the predetermined water temperature Tcw, the coolant is supplied to the heater core 44 and the throttle body 49 by the wax case 72 of the first thermostat valve 70 and the bottom bypass valve 79 of the first thermostat valve 70A. By closing the 1st cooling water flow path 45, the flow volume of the cooling water which circulates through a radiator increases, and the thermal radiation amount in the radiator 42 increases. As a result, it is possible to expect a reduction in cost and an increase in the degree of freedom of design by reducing the size of the radiator 42.

  The present invention can be applied to, for example, a water-cooled engine mounted on an automobile.

10 Engine 20 Cylinder block 21 Water jacket in block 30 Cylinder head 31 Water jacket in head 32 Guide flow path (cooling water outlet of water jacket in block)
44 Heater core (equipment subject to heating)
45 1st cooling water flow path (cooling water flow path for equipment to be heated)
49 Throttle body (equipment subject to heating)
70 First thermostat valve (valve device)
70A 1st thermostat valve (bottom bypass type thermostat valve)
71 Valve body (first valve body)
72 Wax case (case, interlocking member)
95 Third cooling water flow path (cooling water flow path for equipment to be heated)
791 Valve body (second valve body)

Claims (7)

A water jacket in the block formed in the cylinder block;
A water jacket in the head formed in the cylinder head;
A cooling water flow path for circulating cooling water in parallel to the water jacket in the block and the water jacket in the head;
A valve device provided so that the circulation of the cooling water in the water jacket in the block can be stopped while the cooling water in the water jacket in the head is circulated;
A cooling water flow path for the heating target device for circulating the cooling water to the heating target device;
A cooling device for an internal combustion engine comprising:
The valve device is
A first valve body that stops circulation of the cooling water in the water jacket in the block in a valve-closed state and permits circulation of the cooling water in the water jacket in the block in a valve-open state;
In conjunction with the operation from the valve closing side to the valve opening side of the first valve element, the first valve element operates from the side to open the cooling water flow path for the device to be heated to the side to close, thereby opening the first valve element. In conjunction with the operation from the valve side to the valve closing side, an interlocking member that operates from the side that closes the cooling water passage for the device to be heated to the side that opens,
A cooling device for an internal combustion engine, comprising: The cooling apparatus for an internal combustion engine according to claim 1,
The valve device is a thermostat valve having the first valve body and a case incorporating a thermal expansion body that moves integrally with the first valve body,
The cooling device for an internal combustion engine, wherein the interlocking member is the case. The cooling apparatus for an internal combustion engine according to claim 1,
The valve device includes the first valve body, a case incorporating a thermal expansion body that moves integrally with the first valve body, and a second valve body that moves integrally with the case. It is a bottom bypass type thermostat valve,
The internal combustion engine cooling device, wherein the interlocking member is the second valve body. The cooling apparatus for an internal combustion engine according to claim 2,
The first valve body opens and closes a cooling water outlet of the water jacket in the block,
The case opens and closes a cooling water inlet of the cooling water flow path for the device to be heated,
A cooling device for an internal combustion engine, wherein a cooling water outlet of the water jacket in the block and a cooling water inlet of the cooling water flow path for the device to be heated are opposed to each other. The cooling apparatus for an internal combustion engine according to claim 3,
The first valve body opens and closes a cooling water outlet of the water jacket in the block,
The second valve body opens and closes a cooling water inlet of the cooling water passage for the device to be heated,
A cooling device for an internal combustion engine, wherein a cooling water outlet of the water jacket in the block and a cooling water inlet of the cooling water flow path for the device to be heated are opposed to each other. The cooling apparatus for an internal combustion engine according to any one of claims 1 to 5,
The cooling apparatus for an internal combustion engine, wherein the device to be heated is a throttle body. The cooling apparatus for an internal combustion engine according to any one of claims 1 to 5,
The cooling apparatus for an internal combustion engine, wherein the device to be heated is a heater core.

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