JP2008274783A - Cooling device for internal combustion engine - Google Patents

Abstract

To provide a cooling device for an internal combustion engine which can separate air from a coolant with a simple configuration and remove air accumulated in a bent portion of a pipe.
An engine hose, a first radiator hose and a second radiator hose are connected by a three-way branch pipe joint, and an engine hose and a first radiator hose are connected by a three-way branch joint. And it connects so that the 2nd radiator hose 27 may be bent. Further, the three-way branch pipe joints 21 and 25 are provided with neck portions 43 and 47 having openings 43a and 47a for venting air, and the openings 43a and 47a are opened at the time of injecting the cooling liquid, and the air separated from the cooling liquid is provided. Is discharged to the outside through the openings 43a and 47a of the three-way branch pipe joints 21 and 25.
[Selection] Figure 1

Description

  The present invention relates to a cooling device for an internal combustion engine, and more particularly, to a cooling device for an internal combustion engine in which a coolant is circulated between the internal combustion engine and a heat exchanger to cool the internal combustion engine.

  Generally, a water-cooled cooling device is provided in an internal combustion engine of a vehicle. The cooling device connects a heat exchange radiator, a water pump, an internal combustion engine, and a radiator. Piping etc. which circulate a cooling fluid between radiators are provided.

  Then, the coolant is forcedly circulated between the internal combustion engine and the radiator through the piping by operating the pump for water pressure in conjunction with the rotation of the internal combustion engine, that is, the rotation of the crankshaft. As a result of this circulation, the internal combustion engine is cooled, and the radiator dissipates heat of the heated water.

  In this cooling device, the cooling liquid deteriorates or decreases with time, so that it is necessary to replace or replenish the cooling liquid as necessary. In this case, since water is injected from the inlet provided in the upper tank of the radiator, air may accumulate in the upper tank.

  If air accumulates in the upper tank in this way, air may enter the water pump and cavitation may occur, leading to overheating of the internal combustion engine. Therefore, it is necessary to vent the air.

  As a cooling device that performs such air venting, for example, the internal combustion engine and the radiator are each provided with an inlet that can be opened and closed by a cap, and opened and closed by a cap in the vicinity of the inlet provided in the internal combustion engine. The thing provided with the possible air vent hole is known (for example, refer patent document 1).

In this cooling device, when water injection work is performed, water is injected from the inlet of the radiator with the caps of both the internal combustion engine and the radiator removed and the inlets of the internal combustion engine and the radiator opened. When water is supplied from the radiator to the internal combustion engine, the air accumulated in the piping provided between the internal combustion engine and the radiator is pushed out to the atmosphere through the air vent hole, whereby air is vented.
Japanese Utility Model Publication No. 57-81432

  However, in such a conventional cooling device, when the layout of the internal combustion engine and the radiator attached to the vehicle is complicated, for example, in order to avoid an in-vehicle device installed between the internal combustion engine and the radiator, predetermined piping is not provided. When a large part is bent in the vertical direction, or when the internal combustion engine is installed in the front of the vehicle and the radiator is installed at the rear of the vehicle, the pipe becomes long and a large number of bent parts occur, resulting in a complicated piping route. Cannot be easily vented.

  In other words, air is separated from the coolant at the bent portion where the flow of the coolant changes, and air easily accumulates at the bent portion, and air can be easily obtained only from the air vent hole provided near the inlet of the internal combustion engine. It will be difficult to remove.

  The present invention has been made to solve the conventional problems as described above, and is a cooling system for an internal combustion engine that can separate air from a coolant and remove air accumulated in a bent portion of a pipe with a simple configuration. An object is to provide an apparatus.

  In order to solve the above problems, an internal combustion engine cooling apparatus according to the present invention is (1) an internal combustion engine configured to cool an internal combustion engine by circulating a coolant between the internal combustion engine and a heat exchanger. In this cooling apparatus, the cooling apparatus is provided with a pipe interposed between the internal combustion engine and the heat exchanger and having a bent portion at a predetermined location, and an air vent mechanism provided at the bent portion.

  With this configuration, since the air vent mechanism is provided at the bent portion of the pipe, when injecting the coolant into the heat exchanger, the coolant circulating through the heat exchanger and the internal combustion engine collides with the bent portion to By forcibly changing the flow, it is possible to separate the air from the coolant and to discharge the air from the bent portion through the air vent mechanism.

  For this reason, even if the piping is long and complicated and a predetermined portion of the piping is bent, the air can be separated from the coolant and the air accumulated in the bent portion of the piping can be removed from the piping with a simple configuration. it can.

  The cooling apparatus for an internal combustion engine according to the present invention is the internal combustion engine cooling apparatus according to (1) described above, wherein (2) the coolant is circulated between the internal combustion engine and the heat exchanger. An internal combustion engine cooling apparatus configured to cool the internal combustion engine and the heat exchanger, a pipe having a bent portion at a predetermined position, a reservoir tank provided in the bent portion, And an air vent mechanism provided in the reservoir tank.

  With this configuration, a reservoir tank is provided in the bent portion of the pipe, and an air vent mechanism is provided in the reservoir tank. Therefore, when injecting the coolant into the heat exchanger, the coolant that circulates between the heat exchanger and the internal combustion engine is used. By forcibly changing the flow of the cooling liquid by colliding with the bent portion, the air can be separated from the cooling liquid and stored in the reservoir tank, and the air can be discharged from the reservoir tank via the air vent mechanism.

  For this reason, even if the piping is long and complicated and a predetermined portion of the piping is bent, the air can be separated from the coolant and the air accumulated in the bent portion of the piping can be removed from the piping with a simple configuration. it can.

Moreover, the cooling device for an internal combustion engine according to the present invention is the cooling device for an internal combustion engine according to (1) or (2), wherein (3) the bent portion is installed above the heat exchanger. Consists of things.
With this configuration, since the bent portion is installed above the heat exchanger, the separated air can be collected in the bent portion, and the air can be efficiently extracted from the bent portion.

  The internal combustion engine cooling device according to the present invention is the internal combustion engine cooling device according to any one of (1) to (3), wherein (4) the air vent mechanism is such that the pressure in the bent portion is equal to or higher than a predetermined pressure. It is composed of a pressure control valve that is released when

  With this configuration, when the pressure in the bent portion becomes equal to or higher than a certain pressure, the air accumulated in the bent portion can be discharged from the pressure control valve, so that air can be extracted from the bent portion when the coolant is injected. .

  An internal combustion engine cooling device according to the present invention is the internal combustion engine cooling device according to any one of (2) to (4), wherein (5) the opening formed in the reservoir tank and the opening are opened and closed. And a cap member detachably provided on the reservoir tank, and the pressure control valve is provided on the cap member.

  With this configuration, when injecting the coolant, the cap member can be removed from the bent portion and the coolant can be injected into the pipe through the opening.

  In addition, when the cap member is attached to the reservoir tank after the injection work is completed, the coolant flowing between the internal combustion engine and the heat exchanger is collided with the bent portion during the operation of the vehicle, and the coolant flow By forcibly changing the pressure, the pressure control valve can be opened to the outside when the air is separated from the coolant and the air pressure separated and stored in the reservoir tank becomes equal to or higher than a certain pressure.

  For this reason, the air stored in the reservoir tank during the operation of the vehicle can be periodically discharged to the outside, and the existing reservoir tank for gas-liquid separation can be eliminated. For this reason, while being able to simplify the structure of a cooling device, manufacturing cost can be reduced.

  The internal combustion engine cooling device according to the present invention is the internal combustion engine cooling device according to any one of (1) to (5), wherein (6) one end of the pipe is connected to the internal combustion engine, An internal combustion engine-side pipe through which the refrigerant flows, and one end connected to the heat exchanger, the other end connected to the other end of the internal combustion engine-side pipe, and a heat exchanger side pipe through which the coolant flows The bent portion is formed by bending and is a pipe joint that connects the internal combustion engine side pipe and the heat exchanger side pipe.

  With this configuration, since the pipe joint that connects the heat exchanger side pipe and the internal combustion engine side pipe can be used as a bent portion, air accumulated in the pipe joint can be removed, so an air vent means or a reservoir tank is attached to the pipe. Can be made unnecessary. For this reason, the structure of a cooling device can be simplified further and the manufacturing cost of a cooling device can be reduced further.

  An internal combustion engine cooling device according to the present invention is the internal combustion engine cooling device according to (6), wherein (7) the heat exchanger is spaced apart from the first heat exchanger and the first heat exchanger. The heat exchanger side pipe is configured with two heat exchangers, and one end of the heat exchanger side pipe is connected to the first heat exchanger and the other end is connected to the other end of the internal combustion engine side pipe. A pipe having an exchanger side, and a second heat exchanger side pipe having one end connected to the second heat exchanger and the other end connected to the other end of the internal combustion engine side pipe, A predetermined portion is bent so that a joint branches the first heat exchanger side pipe and the second heat exchanger side pipe from the internal combustion engine side pipe, and the other end of the internal combustion engine side pipe and the first It consists of a three-way branch pipe joint that connects the heat exchanger side pipe and the other end of the second heat exchanger side pipe. And a what it is.

  With this configuration, when two heat exchangers are installed, the first heat exchanger side pipe, the second heat exchanger side pipe, and the internal combustion engine side pipe are connected by the three-way branch joint. Air is separated from coolant by forcibly changing the coolant flow by colliding the coolant circulating in the heat exchanger side piping, second heat exchanger side piping, and internal combustion engine side piping against the three-way branch fitting. can do.

  Further, the air accumulated in the three-way branch pipe joint can be discharged to the outside from the air vent mechanism provided in the three-way branch pipe joint, and the air accumulated in the branch pipe joint can be stored in the reservoir tank.

Therefore, even if the internal combustion engine is arranged on the front side of the vehicle and the heat exchanger is installed on the rear side of the vehicle, the piping becomes long and complicated, the heat exchanger side piping and the internal combustion engine side Separation and venting of the coolant and air can be performed at the same time by using a three-way branch joint that connects the pipes, the configuration of the cooling device can be further simplified, and the manufacturing cost of the cooling device can be further reduced. Can be reduced.
The cooling device for an internal combustion engine according to the present invention is the cooling device for an internal combustion engine according to any one of (2) to (7), wherein (8) the reservoir tank is an excess coolant when the coolant is expanded. It is comprised from what has the volume which accommodates.

  With this configuration, when the coolant flowing between the internal combustion engine and the heat exchanger expands due to a temperature rise, excess coolant can be stored in the reservoir tank, and when the coolant contracts due to a temperature drop In addition, the insufficient coolant can be replenished from the reservoir tank between the internal combustion engine and the heat exchanger.

  ADVANTAGE OF THE INVENTION According to this invention, the cooling device of the internal combustion engine which can isolate | separate air from a cooling fluid with a simple structure and can remove the air collected in the bending part of piping can be provided.

Embodiments of a cooling apparatus for an internal combustion engine according to the present invention will be described below with reference to the drawings.
(First embodiment)
1 to 3 are views showing a first embodiment of a cooling device for an internal combustion engine according to the present invention.
First, the configuration will be described.
In FIG. 1, an engine 2 as an internal combustion engine provided in front of a vehicle 1 has a water jacket (not shown) provided therein, and the water jacket is cooled by an antifreeze such as LLC (Long Life Coolant) and water. The engine 2 is cooled as the liquid flows.

  In addition, an introduction portion 3 for introducing coolant into the water jacket is provided on the lower side surface of the engine 2 together with the water pump 4, and a discharge portion 5 for discharging the coolant from the water jacket is provided on the upper side surface of the engine 2. Is provided.

  A first radiator 6 serving as a heat exchanger and a second radiator 7 serving as a heat exchanger are provided behind the vehicle 1 in the left-right direction of the vehicle 1. Since the first radiator 6 and the second radiator 7 are separated from each other in the front-rear direction of the vehicle 1, a weight balance between the front and rear of the vehicle 1 can be ensured.

  Further, an upper tank 10 is provided on the upper portion of the first radiator 6, and an introduction portion 12 for introducing a coolant is provided in the upper tank 10. Further, a lower tank 11 is provided at the lower part of the first radiator 6, and the lower tank 11 is provided with a discharge portion 13 for discharging the coolant.

  The first radiator 6 introduces the coolant introduced into the upper tank 10 from the introduction portion 12 into the lower tank 11 through a known radiator tube provided in the radiator main body 14, and discharges the coolant from the lower tank 11 through the discharge portion 13. Thus, the coolant is circulated in the radiator body 14.

  Further, an upper tank 15 is provided at the upper part of the second radiator 7, and an introduction part 17 for introducing a coolant is provided in the upper tank 15. Further, a lower tank 16 is provided at the lower part of the second radiator 7, and the lower tank 16 is provided with a discharge portion 18 for discharging the coolant.

  The second radiator 7 introduces the coolant introduced into the upper tank 15 from the introduction portion 17 into the lower tank 16 through a known radiator tube provided in the radiator main body 19, and discharges the coolant from the lower tank 16 through the discharge portion 18. Thus, the coolant is circulated in the radiator body 19.

  On the other hand, one end portion 20a of an engine hose 20 as an internal combustion engine side pipe is connected to the introduction portion 3 of the engine 2, and the other end portion 20b of the engine hose 20 is connected to a three-way branch pipe joint 21 constituting a pipe joint. It is connected. The three-way branch pipe joint 21 is installed above the vehicle 1 with respect to the upper tank 10 of the first radiator 6.

  The engine hose 20 includes an engine hose body 20A and a mounting hose 20C connected to the engine hose body 20A by a straight pipe joint 20B. The mounting hose 20C is a three-way branch pipe joint 21. And are provided integrally. The mounting hose 20 </ b> C attached to the three-way branch pipe joint 21 constitutes the other end 20 b of the engine hose 20.

  In addition, one end portion 22a of a first radiator hose 22 as a heat exchanger side pipe and a first heat exchanger side pipe is connected to the discharge portion 13 provided in the lower tank 11 of the first radiator 6, and this first The other end 22 b of the 1 radiator hose 22 is connected to the three-way branch pipe joint 21.

  Further, one end portion 23a of a second radiator hose 23 as a heat exchanger side pipe and a second heat exchanger side pipe is connected to the discharge part 18 provided in the lower tank 16 of the second radiator 7, and this first The other end 23b of the two radiator hose 23 is connected to a three-way branch pipe joint 21 as a bent portion.

  That is, the three-way branch pipe joint 21 linearly connects the other end 20b of the engine hose 20 and the other end 23b of the second radiator hose 23, and also connects the other end 20b of the engine hose 20 and the second radiator hose 23. The first radiator hose 22 and the second radiator hose 23 are branched from the engine hose 20 by connecting the other end 22b of the first radiator hose 22 to the other end 23b in a bent state at a right angle.

  Further, one end 24a of an engine hose 24 as an internal combustion engine side pipe is connected to the discharge part 5 of the engine 2, and the other end 24b of the engine hose 24 is connected to a three-way branch pipe joint 25 constituting a pipe joint. It is connected. The three-way branch pipe joint 25 is installed above the vehicle 1 with respect to the upper tank 15 of the second radiator 7.

  The engine hose 24 includes an engine hose body 24A and a mounting hose 24C connected to the engine hose body 24A by a pipe joint 24B. The mounting hose 24C is provided integrally with the three-way branch pipe joint 25. It has been. The mounting hose 24C attached to the three-way branch pipe joint 25 constitutes the other end 24b of the engine hose 24.

  On the other hand, one end portion 26a of the first radiator hose 26 as the heat exchanger side piping and the first heat exchanger side piping is connected to the introduction portion 12 provided in the upper tank 10 of the first radiator 6. The other end 26 b of the first radiator hose 26 is connected to the three-way branch joint 25.

  In addition, one end portion 27a of a second radiator hose 27 as a heat exchanger side pipe and a second heat exchanger side pipe is connected to the introduction portion 17 provided in the upper tank 15 of the second radiator 7, The other end 27 b of the second radiator hose 27 is connected to the three-way branch pipe joint 25.

  That is, the three-way branch pipe joint 25 linearly connects the other end 24b of the engine hose 24 and the other end 26b of the first radiator hose 26, and also connects the other end 24b of the engine hose 24 and the first radiator hose 26. The other end portion 27 b of the second radiator hose 27 is connected to the other end portion 26 b in a state of being bent at a right angle, and the first radiator hose 26 and the second radiator hose 27 are branched from the engine hose 24.

  A reservoir tank 29 is connected to the introduction part 3 of the engine 2 via a reservoir hose 28, and this reservoir tank 29 is connected to a discharge part 30 provided in the upper tank 15 of the second radiator 7. A reservoir hose 31 is provided.

  A reservoir hose 33 branches off from the reservoir hose 31, and the reservoir hose 31 is connected to a discharge portion 32 provided in the upper tank 10 of the first radiator 6.

  The engine hoses 20, 24, the first radiator hoses 22, 26, and the second radiator hoses 23, 27 are made of rubber such as EPDM (ethylene propylene diene) and have a flexible structure.

  In addition, a cap member 35 containing a pressure control valve (not shown) is provided on the upper portion of the reservoir tank 29. The cap member 35 is detachable from the reservoir tank 29 so as to open and close the reservoir tank 29. Yes.

  In addition, a pressure control valve (not shown) built in the cap member 35 opens the reservoir tank 29 to the outside when the pressure in the reservoir tank 29 becomes a predetermined pressure or higher, and collects air accumulated in the reservoir tank 29. It comes to discharge.

  Further, the water pump 4 is configured such that a driving force is transmitted from a connecting member connected to a crankshaft provided in the engine 2, and when the engine is operated, the first radiator 6 and the second radiator are used. The coolant cooled in 7 is introduced into the water jacket of the engine 2 through the engine hose 20.

  Since the engine hose 24 is connected to the upper tanks 10 and 15 of the first radiator 6 and the second radiator 7 via the first radiator hose 26 and the second radiator hose 27, the cooling discharged from the water jacket of the engine 2 When the liquid passes through the radiator main bodies 14 and 19 from the upper tanks 10 and 15, the liquid is cooled by exchanging heat with vehicle traveling wind or forced air of a fan (not shown).

  The cooling liquid is introduced from the lower tanks 11 and 16 into the water jacket of the engine 2 through the first radiator hose 22 and the second radiator hose 23 through the engine hose 20, whereby the engine 2 is cooled by the cooling liquid. The

  The reservoir tank 29 is provided at the top of the cooling system. When the coolant expands due to a temperature rise, the reservoir hoses 31 and 33 are connected from the upper tank 10 of the first radiator 6 and the upper tank 15 of the second radiator 7. The air and the excess coolant are returned to the reservoir tank 29 via the.

  At this time, if the air pressure in the reservoir tank 29 is increased by the excess cooling liquid, the pressure in the reservoir tank 29 is opened to the outside by the pressure control valve built in the cap member 35, so that the air accumulated in the reservoir tank 29. Is exhausted.

  Further, when the cooling liquid contracts due to the temperature drop, the cooling liquid separated into the gas and liquid is introduced from the reservoir tank 29 through the reservoir hose 28 to the introduction part 3 of the engine 2, whereby the engine 2, the first radiator 6, The shortage of the coolant circulating through the second radiator 7 is replenished.

  On the other hand, as shown in FIG. 2, the three-way branch pipe joint 21 includes a straight upper die 41 and a T-shape that is attached to the upper die 41 and defines a coolant flow path together with the upper die 41. The lower mold 42 is provided.

  The upper die 41 is provided with a neck portion 43 having an air vent opening 43 a formed on the inner peripheral portion thereof, and a screw portion 43 b is formed on the inner peripheral portion of the neck portion 43. A cap member 44 is detachably attached to the neck portion 43, and a screw portion 44 a that engages with the screw portion 43 b is provided on the outer periphery of the cap member 44. In the embodiment, the opening 43a, the neck 43 and the cap member 44 constitute an air vent mechanism.

  In this three-way branch pipe joint 21, after attaching the other end 20b of the mounting hose 20C, the other end 22b of the first radiator hose 22 and the other end 23b of the second radiator hose 23 to the lower mold 42, the upper mold 41 The upper die 41 and the lower die 42 are brazed to the lower die 42 in a state where is fitted to the lower die 42, so that the three-way branch fitting 21 is liquid-tightly attached.

  The upper die 41 is formed in a straight line, and the lower die 42 is formed in a straight line portion 42a that connects the other end portion 20b of the engine hose 20 and the other end portion 23b of the second radiator hose 23 in a straight line, and an engine hose. And a bent portion 42b for connecting the other end portion 22b of the first radiator hose 22 in a state of being bent at a right angle to the other end portion 20b of the second radiator hose 23 and the other end portion 23b of the second radiator hose 23. Is formed.

  On the other hand, as shown in FIG. 3, the three-way branch pipe joint 25 is attached to a T-shaped upper mold 45 and the upper mold 45, and together with the upper mold 45, the T-shaped And a mold 46.

  The upper die 45 is provided with a neck portion 47 having an air vent opening 47 a formed on the inner peripheral portion thereof, and a screw portion 47 b is formed on the inner peripheral portion of the neck portion 47. A cap member 48 is detachably attached to the neck portion 47, and a screw portion 48 a that is screwed into the screw portion 47 b is provided on the outer peripheral portion of the cap member 48. In the present embodiment, the opening 47a, the neck 47 and the cap member 48 constitute an air vent mechanism.

  The three-way branch pipe joint 25 is formed by attaching the other end 24b of the mounting hose 24C, the other end 26b of the first radiator hose 26 and the other end 27b of the second radiator hose 27 to the lower mold 46, and then the upper mold 45 The upper die 45 and the lower die 46 are brazed to the lower die 46 in a state where is fitted to the lower die 46, so that the three-way branch pipe joint 25 is liquid-tightly attached.

Further, the upper die 45 and the lower die 46 are linear portions 45a and 46a that linearly connect the other end portion 24b of the engine hose 24 and the other end portion 26b of the first radiator hose 26 and the other end portion 24b of the engine hose 24. The second radiator hose 27 is formed in a T-shape including bent portions 45b and 46b that are connected to the other end portion 26b of the first radiator hose 26 in a state where the other end portion 27b of the second radiator hose 27 is bent at a right angle. .
In the engine cooling apparatus having such a configuration, the cap member 44 extends from the neck portions 43 and 47 of the three-way branch pipe joints 21 and 25 when the cooling liquid is injected at the time of shipment or replacement of the cooling liquid. , 48 is removed, and a coolant is injected from the reservoir tank 29 with a transparent hose or the like inserted into the three-way branch pipe joints 21 and 25 through the openings 43a and 47a of the neck portions 43 and 47.

  The coolant injected into the reservoir tank 29 is introduced from the reservoir hose 28 through the introduction part 3 of the engine 2 into the water jacket of the engine 2 and through the reservoir hoses 31 and 33, the upper tank 10 and the second tank 2 of the first radiator 6. It is introduced into the upper tank 15 of the radiator 7.

  The coolant introduced into the upper tank 10 is introduced into the lower tank 11 from the upper tank 10 through the radiator tube in the radiator main body 14, and then passed through the first radiator hose 22 as the coolant is injected into the first radiator 6. After joining the coolant flowing through the second radiator hose 23 at the branch pipe joint 21, it is introduced into the water jacket of the engine 2 through the engine hose 20 by the water pump 4.

  The coolant supplied to the water jacket of the engine 2 is branched into the second radiator hose 27 and the first radiator hose 26 through the engine hose 24 at the three-way branch joint 25, and a part of the coolant is supplied to the second radiator hose. 27 is introduced into the upper tank 15 of the second radiator 7, and the remaining cooling liquid is introduced into the upper tank 10 of the first radiator 6 from the first radiator hose 26.

  The coolant introduced into the upper tank 15 of the second radiator 7 is introduced from the upper tank 15 into the lower tank 16 through the radiator tube in the radiator main body 19, and then the coolant is injected into the second radiator 7. The coolant is discharged through the second radiator hose 23, merged with the coolant discharged from the first radiator hose 22 at the three-way branch joint 21, and supplied to the water jacket of the engine 2 through the engine hose 20.

  When the engine 2, the first radiator 6 and the second radiator 7 are sufficiently filled with the coolant, the coolant in the engine hoses 20, 24, the first radiator hoses 22, 26 and the second radiator hoses 23, 27 Therefore, it is determined that the engine 2, the first radiator 6 and the second radiator 7 are sufficiently filled with the cooling liquid, and the injection operation is finished.

  By the way, since air is separated from the coolant during the coolant injection operation, the air may be mixed into the water pump 4 and cavitation may occur unless the air is vented, leading to overheating of the engine 2. There is.

  In the present embodiment, the engine 2 is installed in front of the vehicle 1, and the first radiator 6 and the second radiator 7 are installed in the rear of the vehicle 1, and the engine 2, the first radiator 6 and the second radiator are installed. Since the engine hoses 20, 24, etc. installed between the pipes 7 are long and have a complicated piping path, the other end 20b of the engine hose 20 and the other end of the second radiator hose 23 are connected by the three-way branch pipe joint 21. The other end portion 20b of the engine hose 20 and the other end portion 22b of the first radiator hose 22 are connected to be bent, and the engine hose is connected to the engine hose by a three-way branch pipe joint 25. The other end 24b of the first radiator hose 26 and the other end 24b of the first radiator hose 26 are connected in a straight line, and the other end 24b of the engine hose 24 is connected. It is connected so as to bend the other end portion 27b of the second radiator hose 27.

  In such a case, the coolant discharged from the first radiator 6 and the second radiator 7 is merged by the three-way branch pipe joint 21 and the flow is forcibly changed, so that the first radiator 6 and the second radiator 6 are changed. Air discharged from the radiator 7 is easily separated from the coolant.

  Further, since the coolant supplied from the engine hose 24 to the first radiator 6 and the second radiator 7 is branched by the three-way branch joint 25 and the flow is forcibly changed, the first radiator 6 and the second radiator are changed. The air supplied to 7 is easily separated from the coolant.

  In the present embodiment, the three-way branch pipe joints 21 and 25 are provided with neck portions 43 and 47 having openings 43a and 47a for venting air, and the openings 43a and 47a are opened at the time of injecting the coolant. The air separated from the coolant can be discharged to the outside through the openings 43a and 47a of the three-way branch pipe joints 21 and 25.

  For this reason, even if the engine hoses 20, 24, etc. are long and complicated, the engine hose 20, the first radiator hose 22, and the second radiator hose 23 are bent and connected, and the engine Separation of the coolant and air and air venting can be performed simultaneously using the three-way branch joint 25 that bends and connects the hose 24, the first radiator hose 26, and the second radiator hose 27. As a result, the configuration of the cooling device can be simplified, and the manufacturing cost of the cooling device can be prevented from increasing.

  In the present embodiment, since the three-way branch pipe joints 21 and 25 are installed above the first radiator 6 and the second radiator 7, air can be collected in the three-way branch pipe joints 21 and 25. Air can be efficiently extracted from the pipe joints 21 and 25.

  In the present embodiment, the air vent mechanism is constituted by the openings 43a and 47a, the neck portions 43 and 47, and the cap members 44 and 48. However, the present invention is not limited to this, and the cap members 44 and 48 are provided with a three-way branch pipe joint. A pressure control valve that is released when the pressure in the pressure chambers 21 and 25 becomes equal to or higher than a certain pressure may be built in, and an air vent mechanism may be configured by the cap members 44 and 48 and the pressure control valve.

  In this case, when the coolant is injected, the air can be extracted from the three-way branch pipe joints 21 and 25 when the pressure in the three-way branch pipe joints 21 and 25 becomes a predetermined pressure or higher. . Further, since the coolant is discharged from the pressure control valve simultaneously with the air, the coolant injection operation can be completed using this as a guide.

In the present embodiment, the engine hose 20, the first radiator hose 22 and the second radiator hose 23 are connected by the three-way branch joint 21, and the engine hose 24, the first radiator hose 26 and the second radiator hose 27 are connected. Although connected by the three-way branch pipe joint 25, the engine hose 20, the first radiator hose 22 and the second radiator hose 23 are integrally formed to provide a bent portion at a predetermined location, and an opening 43a is provided at the bent portion. The neck portion 43 may be provided, and the engine hose 24, the first radiator hose 26, and the second radiator hose 27 are integrally formed to provide a bent portion at a predetermined position, and the neck portion having an opening 47a at the bent portion. A portion 47 may be provided.
Moreover, in this Embodiment, although the T-shaped three-way branch pipe joints 21 and 25 are used, you may use three-way branch pipe joints 21 and 25, such as a Y-shape.

(Second Embodiment)
4-7 is a figure which shows 2nd Embodiment of the cooling device of the internal combustion engine which concerns on this invention, In this Embodiment, the structure of the pipe joint as a bending part is 1st Embodiment. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the present embodiment, the reservoir tank 29 of the first embodiment is eliminated.
In FIG. 4, the other end 20 b of the engine hose 20 is connected to a three-way branch pipe joint 51 that constitutes a pipe joint as a bent part. The three-way branch pipe joint 51 is connected to the upper tank 10 of the first radiator 6. Rather than above the vehicle 1. The other end 22 b of the first radiator hose 22 is connected to the three-way branch pipe joint 51, and the other end 23 b of the second radiator hose 23 is connected to the three-way branch pipe joint 51.

  That is, the three-way branch pipe joint 51 linearly connects the other end 20b of the engine hose 20 and the other end 23b of the second radiator hose 23, and also connects the other end 20b of the engine hose 20 and the second radiator hose 23. The other end portion 22b of the first radiator hose 22 is connected to the other end portion 23b in a state of being bent at a right angle, and the first radiator hose 22 is branched from the engine hose 20.

  Further, the other end 24 b of the engine hose 24 is connected to a three-way branch pipe joint 52 that constitutes a pipe joint serving as a bent part. The three-way branch pipe joint 52 is more than the upper tank 15 of the second radiator 7. It is installed above the vehicle 1. The other end 26 b of the first radiator hose 26 is connected to the three-way branch fitting 52, and the other end 27 b of the second radiator hose 27 is connected to the three-way branch fitting 52.

  That is, the three-way branch joint 52 connects the other end 24b of the engine hose 24 and the other end 26b of the first radiator hose 26 in a straight line, and also connects the other end 24b of the engine hose 24 and the first radiator hose 26. The other end portion 27 b of the second radiator hose 27 is connected to the other end portion 26 b in a state of being bent at a right angle, and the first radiator hose 26 and the second radiator hose 27 are branched from the engine hose 24.

  Further, as shown in FIGS. 5 and 6, the three-way branch pipe joint 51 is attached to the upper mold 54 in which the reservoir tank 53 is integrally formed and the upper mold 54, and the coolant flow path together with the upper mold 54. And a lower mold 55 that defines

  The lower die 55 includes a straight portion 55a that linearly connects the other end portion 20b of the engine hose 20 and the other end portion 23b of the second radiator hose 23, and the other end portion 20b of the engine hose 20 and the second radiator hose. The other end portion 23b of the first radiator hose 22 is formed in a T-shape including a bent portion 55b that connects the other end portion 22b of the first radiator hose 22 in a bent state at a right angle.

  A neck portion 56 in which an opening 56 a for injecting a cooling liquid is formed projects from the upper portion of the reservoir tank 53, and a screw portion 56 b is formed on the outer peripheral portion of the neck portion 56. A cap member 57 is detachably attached to the neck portion 56, and a screw portion 57 a that is screwed into the screw portion 56 b is provided on the inner peripheral portion of the cap member 57.

  Further, the three-way branch pipe joint 51 is attached to the lower die 55 after the other end 20b of the attachment hose 20C, the other end 22b of the first radiator hose 22 and the other end 23b of the second radiator hose 23 are attached. The upper die 54 and the lower die 55 are brazed to the three-way branch pipe joint 51 in a state where the lower die 55 is aligned with the lower die 55, so that the three-way branch pipe joint 51 is liquid-tight.

  Further, as shown in FIG. 6, the cap member 57 is provided with a pressure control valve 58. The pressure control valve 58 includes a stopper portion 57b provided on the inner peripheral surface of the cap member 57, and a stopper portion 57b. Is provided on the cap member 57, and the pressure in the reservoir tank 53 is equal to or higher than a predetermined pressure. The valve member 59 is in contact with the stopper member 57b. When the valve body 59 moves upward against the urging force of the spring 60, it is constituted by an air vent hole 57c that communicates the opening 56a with the outside air. In the present embodiment, the opening 56a, the neck 56, the cap member 57, and the pressure control valve 58 constitute an air vent mechanism.

Further, as shown in FIG. 7, the three-way branch pipe joint 52 is attached to the upper mold 62 in which the reservoir tank 61 is integrally formed and the upper mold 62, and together with the upper mold 62, defines a coolant flow path. And a lower mold 63. The lower mold 63 includes a straight portion 63a that connects the other end portion 24b of the engine hose 24 and the other end portion 26b of the first radiator hose 26 in a straight line, the other end portion 24b of the engine hose 24, and the first radiator hose 26. The other end portion 26b of the second radiator hose 27 is formed in a T-shape including a bent portion 63b that connects the other end portion 27b of the second radiator hose 27 in a bent state at a right angle.
A neck portion 64 having an opening 64 a for injecting a coolant is formed on the upper portion of the reservoir tank 61, and a screw portion 64 b is formed on the outer periphery of the neck portion 64. A cap member 57 having the same configuration as that shown in FIG. In the present embodiment, the cap member 57, the pressure control valve 58, the opening 64a, and the neck 64 constitute an air vent mechanism.

  In addition, the reservoir tanks 53 and 61 have a capacity for storing surplus cooling liquid when the cooling liquid expands, and have the same function as the reservoir tank 29 that is abolished in the first embodiment. The pressure control valve 58 opens the reservoir tanks 53 and 61 to the outside when the air pressure in the reservoir tanks 53 and 61 becomes equal to or higher than a certain pressure.

  In the engine cooling apparatus having such a configuration, the cap member 57 is removed from the neck portions 56 and 64 of the reservoir tanks 53 and 61 when the coolant is injected at the time of shipment or when the coolant is replaced. The coolant is injected through the openings 56 a and 64 a of the necks 56 and 64.

  A part of the coolant injected into the reservoir tank 53 is introduced into the water jacket of the engine 2 from the engine hose 20 through the introduction part 3 of the engine 2 by driving the water pump 4 and then from the engine hose 24 to the three-way branch joint. 52 is branched into the second radiator hose 27 and the first radiator hose 26 and introduced into the upper tank 10 of the first radiator 6 and the upper tank 15 of the second radiator 7.

  Further, the coolant injected into the reservoir tank 61 is branched into the first radiator hose 26 and the second radiator hose 27 by the three-way branch pipe joint 52, and the upper tank 10 of the first radiator 6 and the upper tank of the second radiator 7. 15 is introduced.

  The coolant introduced into the upper tank 10 is introduced from the upper tank 10 into the lower tank 11 through the radiator tube in the radiator main body 14, and then the three-way branch pipe joint 51 through the first radiator hose 22 as the coolant is injected. After merging with the coolant flowing through the second radiator hose 23, the water pump 4 is driven and introduced into the water jacket of the engine 2 through the engine hose 20.

  The coolant introduced into the upper tank 15 of the second radiator 7 is introduced from the upper tank 15 into the lower tank 16 through the radiator tube in the radiator main body 19, and then the coolant is injected into the second radiator 7. The coolant is discharged through the second radiator hose 23, merged with the coolant discharged from the first radiator hose 22 at the three-way branch joint 51, and supplied to the water jacket of the engine 2 through the engine hose 20.

  When the engine 2, the first radiator 6 and the second radiator 7 are sufficiently filled with the coolant, the engine hoses 20, 24, the first radiator hoses 22, 26 and the second radiator hoses 23, 27 are placed in the transparent hose. Since the coolant in the tank overflows and the water level in the reservoir tanks 53 and 61 rises, it is determined that the engine 2, the first radiator 6 and the second radiator 7 are sufficiently filled with the coolant, and the injection operation is performed. finish.

  Note that the water injection operation may be performed from one side without performing the water injection operation from both the reservoir tanks 53 and 61. In this case, the cap member 57 is removed from the reservoir tanks 53 and 61 where water injection is not performed.

  In the present embodiment, the coolant discharged from the first radiator 6 and the second radiator 7 at the three-way branch pipe joint 51 joins at the time of the coolant injection operation and the flow is forcibly changed. The air discharged from the radiator 6 and the second radiator 7 can be easily separated from the coolant.

  Further, since the coolant supplied from the engine hose 24 to the first radiator 6 and the second radiator 7 is branched by the three-way branch joint 52 and the flow is forcibly changed, the first radiator 6 and the second radiator are changed. The air supplied to 7 is easily separated from the coolant.

  The three-way branch pipe joints 51 and 52 are provided with reservoir tanks 53 and 61, the reservoir tanks 53 and 61 are provided with neck portions 56 and 64 having openings 56a and 64a, and the openings 56a and 64a are opened. Since the cooling liquid injection operation is performed, the air separated from the cooling liquid can be discharged to the outside through the openings 56a and 64a.

  On the other hand, after the injection operation has been completed and the vehicle 1 has been shipped or the coolant replacement operation has been completed, in a state where the engine is actually operated to run, when the engine is operated, the first radiator 6 and the first radiator 6 The coolant cooled by the two radiators 7 is introduced into the water jacket of the engine 2 through the engine hose 20 by driving the water pump 4.

  The engine hose 24 is connected to the upper tanks 10 and 15 of the first radiator 6 and the second radiator 7 via the first radiator hose 26 and the second radiator hose 27, so that the coolant discharged from the engine 2 can be When passing through the radiator main bodies 14 and 19 from the tanks 10 and 15, heat is exchanged with vehicle traveling wind or forced air of a fan (not shown) to be cooled.

  The coolant is introduced into the water jacket of the engine 2 from the lower tanks 11 and 16 through the first radiator hose 22 and the second radiator hose 23 through the engine hose 20, whereby the engine 2 is cooled by the coolant. .

  In addition, the air discharged from the upper tanks 10 and 15 and the lower tanks 11 and 16 merges at the three-way branch pipe joint 51 and the three-way branch pipe joint 52, is separated from the coolant, and is stored in the reservoir tanks 53 and 61.

  The three-way branch pipe joint 51 and the three-way branch pipe joint 52 are provided at the uppermost position of the cooling system, and when the coolant expands due to the temperature rise, as shown in FIG. 6B, the reservoir tank 53 and the reservoir tank As the water level of the coolant in 61 rises, the surplus coolant is filled into the reservoir tank 53 and the reservoir tank 61. In FIG. 6, the internal structure of the three-way branch pipe joint 51 is illustrated, but the internal structure of the three-way branch pipe joint 52 and the state of the coolant in the three-way branch pipe joint 52 are the same as those of the three-way branch pipe joint 51. .

  At this time, the air pressure in the reservoir tank 53 and the reservoir tank 61 becomes equal to or higher than a predetermined pressure as the excess coolant filled in the reservoir tank 53 and the reservoir tank 61 rises. If larger than that, the valve element 59 moves upward against the biasing force of the spring 60, the reservoir tank 53 and the air vent hole 57c communicate with each other, and the reservoir tank 61 and the air vent hole 57c communicate with each other. For this reason, the air separated from the coolant and stored in the reservoir tank 53 and the reservoir tank 61 is discharged to the outside from the air vent hole 57c.

  Further, when the coolant contracts due to the temperature drop, the coolant level in the reservoir tank 53 and the reservoir tank 61 decreases as shown in FIG. 6A, so that the engine 2, the first radiator 6, and the second radiator 7 are The shortage of circulating coolant is replenished.

  Thus, in the present embodiment, the other end portion 20b of the engine hose 20 and the other end portion 23b of the second radiator hose 23 are connected in a straight line by the three-way branch pipe joint 51, and the other end portion of the engine hose 20 is connected. 20b and the other end 22b of the first radiator hose 22 are connected so as to be bent, and the other end 24b of the engine hose 24 and the other end 26b of the first radiator hose 26 are connected by a three-way branch joint 52. Are connected in a straight line, and the other end portion 24b of the engine hose 24 and the other end portion 27b of the second radiator hose 27 are connected so as to be bent, and the reservoir tanks are connected to the three-way branch pipe joints 51 and 52, respectively. 53 and a reservoir tank 61 were provided.

  Therefore, the coolant flowing through the engine 2, the first radiator 6 and the second radiator 7 is collided with the three-way branch pipe joint 51 and the three-way branch joint 52 to forcibly change the flow of the coolant, thereby Since the separated air can be stored in the reservoir tank 53 and the reservoir tank 61, the air can be extracted from the three-way branch pipe joint 51 and the three-way branch pipe joint 52.

  Therefore, even if the piping path between the engine 2 and the first radiator 6 and the second radiator 7 is long and complicated, the three-way connecting the engine hose 20, the first radiator hose 22, and the second radiator hose 23 By using the branch pipe joint 51 and the three-way branch pipe joint 52 that connects the engine hose 24, the first radiator hose 26, and the second radiator hose 27, it is possible to separate the coolant and the air and release the air at the same time. . As a result, the configuration of the cooling device can be simplified, and the manufacturing cost of the cooling device can be prevented from increasing.

  In the present embodiment, since the three-way branch pipe joint 51 and the three-way branch pipe joint 52 are installed above the first radiator 6 and the second radiator 7, the separated air is supplied to the three-way branch pipe joint 51 and the three-way branch pipe. The air can be collected in the pipe joint 52, and air can be efficiently extracted from the three-way branch pipe joint 51 and the three-way branch pipe joint 52.

  In the present embodiment, since the cap member 57 having the pressure control valve 58 that opens the reservoir tanks 53 and 61 to the outside when the air pressure in the reservoir tanks 53 and 61 becomes a predetermined pressure or more is provided. The coolant flowing through the engine 2, the first radiator 6 and the second radiator 7 is collided with the three-way branch pipe joint 51 and the three-way branch pipe joint 52 during the operation of the vehicle 1 to forcibly change the flow of the coolant. Thus, air is separated from the coolant, and the pressure control valve 58 can be opened to the outside when the air pressure separated and stored in the reservoir tanks 53 and 61 becomes a predetermined pressure or higher.

  For this reason, the air stored in the reservoir tanks 53 and 61 can be periodically discharged to the outside even during operation of the engine, and cavitation can be prevented from occurring due to air entering the water pump 4. Further, overheating of the engine 2 can be prevented.

  Further, since the reservoir tanks 53 and 61 are provided in the three-way branch pipe joint 51 and the three-way branch pipe joint 52, the existing reservoir tank 29 (see FIG. 1) provided on the engine 2 side can be eliminated, and the cooling device The manufacturing cost can be further reduced.

  In the present embodiment, the reservoir tank 53 and the reservoir tank 61 are provided in both the three-way branch pipe joint 51 and the three-way branch pipe joint 52. However, the reservoir tank includes the three-way branch pipe joint 51 and the three-way branch pipe joint 52. You may make it provide in any one of these.

  However, it is preferable to provide the reservoir tank 53 and the reservoir tank 61 in both the three-way branch pipe joint 51 and the three-way branch pipe joint 52 in order to improve the right and left weight balance behind the vehicle 1, in consideration of cost. In this case, it is preferable to provide a reservoir tank in either one of the three-way branch pipe joint 51 and the three-way branch pipe joint 52.

In the present embodiment, the engine hose 20, the first radiator hose 22, and the second radiator hose 23 are connected by a three-way branch joint 51, and the engine hose 24, the first radiator hose 26, and the second radiator hose 27 are connected. Although connected by a three-way branch pipe joint 52, the engine hose 20, the first radiator hose 22 and the second radiator hose 23 are integrally formed to provide a bent portion at a predetermined location, and a reservoir tank 53 is provided at the bent portion. Alternatively, the engine hose 24, the first radiator hose 26, and the second radiator hose 27 may be integrally formed to provide a bent portion at a predetermined location, and the reservoir tank 61 may be provided at the bent portion.
In the present embodiment, T-shaped three-way branch pipe joints 51 and 52 are used, but Y-shaped three-way branch pipe joints 51 and 52 may be used.

(Third embodiment)
8 and 9 are views showing a third embodiment of the cooling apparatus for an internal combustion engine according to the present invention. In the present embodiment, one radiator is provided, and piping for connecting the radiator and the engine is provided in three directions. It differs from the first and second embodiments in that it is connected by a pipe joint instead of the branch pipe joint, and the same number is assigned to the same configuration as the first and second embodiments. The description is omitted.

  In FIG. 8, a radiator 71 as a heat exchanger is provided at a position close to the engine 2 provided in front of the vehicle 1. An upper tank 72 is provided at the upper portion of the radiator 71, and the upper tank 72 is provided with an introduction portion 73 for introducing a coolant. In addition, a lower tank 74 is provided below the radiator 71, and the lower tank 74 is provided with a discharge portion 75 for discharging the coolant.

  One end 76 a of a hose 76 is connected to the introduction part 3 of the engine 2, and the other end 76 b of the hose 76 is connected to a discharge part 75 of the lower tank 74. One end 77a of an engine hose 77 is connected to the discharge part 5 of the engine 2, and the other end 77b of the engine hose 77 is bent as an L-shaped tube. It is connected to a joint 78. The pipe joint 78 may be bent in a U shape, that is, curved.

One end 79 a of a radiator hose 79 is connected to the introduction portion 73 of the radiator 71, and the other end 79 b of the radiator hose 79 is connected to a pipe joint 78. That is, the pipe joint 78 connects the other end portion 77b of the engine hose 77 and the other end portion 79b of the radiator hose 79 in a bent state in an L shape so that the coolant flowing through the engine hose 77 and the radiator hose 79 is circulated. Is going to change the flow.
The pipe joint 78 is used when the engine hose 77 and the radiator hose 79 cannot be installed unless the engine hose 77 and the radiator hose 79 are bent due to the layout of the parts between the engine 2 and the radiator 71. Is bent up and down.

  A reservoir tank 29 is connected to the introduction part 3 of the engine 2 via a reservoir hose 28, and this reservoir tank 29 is connected to an introduction part 80 provided in the upper tank 72 of the radiator 71. 31 is provided.

The reservoir tank 29 includes a cap member 35 containing a pressure control valve, as in the first embodiment. The hose 76, the engine hose 77, and the radiator hose 79 are made of rubber such as EPDM (ethylene propylene diene) and have a flexible structure.
Further, in the present embodiment, when the engine is operated, the coolant cooled by the radiator 71 is introduced into the water jacket of the engine 2 via the hose 76 by driving the water pump 4, and then the engine hose 77. To be supplied.

  After the coolant supplied to the engine hose 77 is supplied to the radiator hose 79 via the pipe joint 78, when the coolant passes through the radiator main body 81 from the upper tank 72, the vehicle running wind or a fan (not shown) It is cooled by exchanging heat with forced air.

  The coolant is introduced into the water jacket of the engine 2 from the lower tank 74 via the hose 76, whereby the engine 2 is cooled by the coolant.

  On the other hand, as shown in FIG. 9, the pipe joint 78 is attached to the upper die 82 bent in an L shape, and is formed in an L shape that defines a coolant flow path together with the upper die 82. A bent lower die 83 is provided. The upper die 82 is provided with a neck portion 84 having an air vent opening 84 a formed on the inner peripheral portion thereof, and a screw portion 84 b is formed on the inner peripheral portion of the neck portion 84. A cap member 85 is detachably attached to the neck portion 84, and a screw portion 85a that is screwed into the screw portion 84b is provided on the outer peripheral portion of the cap member 85. In the present embodiment, the opening portion 84a, the neck portion 84, and the cap member 85 constitute an air vent mechanism.

  The pipe joint 78 is formed by attaching the other end 77 b of the engine hose 77 and the other end 79 b of the radiator hose 79 to the lower mold 83 and then aligning the upper mold 82 with the lower mold 83. It is liquid-tightly attached to the pipe joint 78 by brazing 83 or the like.

  In the engine cooling apparatus having such a configuration, the cap member 85 is removed from the neck portion 84 of the pipe joint 78 when the coolant is injected at the time of shipment or replacement of the coolant, and the neck portion 84 is removed. The coolant is injected from the reservoir tank 29 with a transparent hose or the like inserted into the pipe joint 78 through the opening 84a.

  The coolant injected into the reservoir tank 29 is introduced from the reservoir hose 28 through the introduction part 3 of the engine 2 into the water jacket of the engine 2 and also introduced into the upper tank 72 of the radiator 71 through the reservoir hose 31.

  The coolant introduced into the upper tank 72 is introduced from the upper tank 72 into the lower tank 74 through the radiator tube in the radiator main body 81, and then the water pump 4 is driven to drive the water of the engine 2 through the hose 76. Introduced into the jacket.

  The coolant discharged from the water jacket is introduced into the upper tank 72 through the engine hose 77, the pipe joint 78, and the radiator hose 79.

  Even in the present embodiment, air is separated from the cooling liquid during the cooling liquid injection operation. Therefore, if this air is not removed, air is mixed into the water pump 4 and cavitation occurs. There is a risk of overheating of the engine 2.

In the present embodiment, since the pipe joint 78 is bent in the vertical direction with respect to the horizontal plane, the engine hose 77 and the radiator hose 79 become complicated piping paths, and the pipe joint 78 has a mountain shape. Therefore, the coolant collides at the pipe joint 78 and the flow of the coolant is forcibly changed.
For this reason, air is easily separated from the coolant by the pipe joint 78, and the air discharged from the upper tank 72 of the radiator 71 is likely to stay in the pipe joint 78.

  In the present embodiment, the neck 84 having the opening 84 a is provided in the pipe joint 78, and the neck 84 is opened at the time of the coolant injection operation, so that the air separated from the coolant is opened to the pipe joint 78. It can be discharged to the outside through the portion 84a.

For this reason, even when the piping path between the engine 2 and the radiator 71 becomes complicated, the coolant and air are separated and vented using the pipe joint 78 that connects the engine hose 77 and the radiator hose 79. Can be performed simultaneously. As a result, the configuration of the cooling device can be simplified, and the manufacturing cost of the cooling device can be prevented from increasing.
Further, in this embodiment, since the pipe joint 78 is installed above the radiator 71, air can be collected in the pipe joint 78, and air can be efficiently extracted from the pipe joint 78.

  In the present embodiment, the air vent mechanism is configured by the opening 84a, the neck portion 84, and the cap member 85. However, the present invention is not limited to this, and the pressure in the pipe joint 78 on the cap member 85 becomes a predetermined pressure or higher. In this case, a pressure control valve to be released may be incorporated, and the air vent mechanism may be configured by the cap member 85 and pressure control.

  In this case, when the coolant is injected, the air can be extracted from the pipe joint 78 when the pressure in the pipe joint 78 becomes a predetermined pressure or higher. In addition, since the coolant is discharged from the pressure control valve simultaneously with the air, the coolant injection operation can be completed using the coolant as a guide.

  In this embodiment, the engine hose 77 and the radiator hose 79 are connected by a pipe joint 78. However, the engine hose 77 and the radiator hose 79 are integrally formed to provide a bent portion at a predetermined location. A neck portion 84 having an opening 84a may be provided in the portion.

(Fourth embodiment)
FIGS. 10 and 11 are views showing a fourth embodiment of the cooling device for an internal combustion engine according to the present invention. In this embodiment, the structure of the pipe joint is the same as that of the first to third embodiments. Since they are different, the same components as those in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, the reservoir tank 29 is eliminated as in the first embodiment.

  In FIG. 10, one end 79 a of a radiator hose 79 is connected to the introduction portion 3 of the radiator 71, and the other end 79 b of the radiator hose 79 is connected to a pipe joint 91. That is, the pipe joint 91 is bent in an L shape, and is connected in a state where the other end 77 b of the engine hose 77 and the other end 79 b of the radiator hose 79 are bent. The pipe joint 91 may be bent in a U shape, that is, curved.

As shown in FIG. 11, the pipe joint 91 includes an upper mold 93 in which a reservoir tank 92 is integrally formed, and a lower mold 94 that is attached to the upper mold 93 and defines a coolant flow path together with the upper mold 93. The lower mold 94 is bent in an L shape.
The pipe joint 91 is formed by attaching the other end 77 b of the engine hose 77 and the other end 79 b of the radiator hose 79 to the lower mold 94, and then aligning the upper mold 93 with the lower mold 94. By performing brazing or the like on 94, it is liquid-tightly attached to the pipe joint 91.

  Further, a neck portion 95 in which an opening 95 a for injecting a cooling liquid is formed protrudes from the upper portion of the reservoir tank 92, and a screw portion 95 b is formed on the outer peripheral portion of the neck portion 95. A cap member 57 with a pressure control valve 58 having a configuration similar to that of the second embodiment (see FIG. 6) is detachably attached to the neck portion 95. In the present embodiment, the cap member 57, the pressure control valve 58, the opening 95a, and the neck 95 constitute an air vent mechanism.

  In the engine cooling device having such a configuration, the cap member 57 is removed from the neck portion 95 of the reservoir tank 92 when the coolant is injected at the time of shipment or replacement of the coolant, and the neck portion 95 is removed. The cooling liquid is injected through the opening 95a.

  The coolant injected into the reservoir tank 92 is introduced into the upper tank 72 from the radiator hose 79 and then supplied to the lower tank 74 through the radiator tube in the radiator body 81.

  The coolant in the lower tank 74 is introduced into the water jacket of the engine 2 by driving the water pump 4 through the hose 76, and the coolant introduced into the water jacket is supplied from the engine hose 77 to the radiator hose 79 through the pipe joint 91. Is done.

  Then, when the engine 2 and the radiator 71 are sufficiently filled with the coolant, the coolant in the hose 76, the engine hose 77 and the radiator hose 79 overflows, and the water level in the reservoir tank 92 rises. It is determined that the radiator 71 is sufficiently filled with the coolant, and the injection operation is finished.

  In the present embodiment, since the coolant circulating through the engine 2 and the radiator 71 collides with the pipe joint 91 and the flow of the coolant is forcibly changed, the air is easily separated from the coolant at the pipe joint 91. Moreover, the air discharged from the radiator 71 tends to gather at the pipe joint 91.

  In this embodiment, a reservoir tank 92 is provided in the pipe joint 91, and a neck portion 95 having an opening 95a is provided in the reservoir tank 92, and the opening 95a is opened to perform a coolant injection operation. Therefore, the air separated from the coolant can be discharged outside through the opening 95a.

  On the other hand, after the injection operation has been completed and the vehicle 1 has been shipped or the coolant replacement operation has been completed, the engine 71 is cooled by the radiator 71 when the engine is operated in a state where the engine is actually operated. The coolant is introduced into the water jacket of the engine 2 through the hose 76, and the engine 2 is cooled.

  The coolant discharged from the water jacket of the engine 2 is introduced into the upper tank 72 via the engine hose 77, the pipe joint 91 and the radiator hose 79, and when the coolant passes through the radiator body 81 from the upper tank 72, Heat is exchanged with vehicle traveling wind or forced wind of a fan (not shown) and cooled, and then supplied from the lower tank 74 to the engine 2 via the hose 76.

  The coolant is introduced into the water jacket of the engine 2 from the lower tank 74 via the hose 76, whereby the engine 2 is cooled by the coolant, and the coolant discharged from the water jacket is discharged from the discharge unit 5 to the engine. It is discharged to the hose 77.

  Further, during operation of the engine, air is separated from the coolant by the pipe joint 91, the separated air is stored in the reservoir tank 92, and the air stored in the upper tank 72 is stored in the reservoir tank 92. The

  This pipe joint 92 is provided at the uppermost position of the cooling system. When the coolant expands due to a temperature rise, the coolant level in the reservoir tank 92 rises, so that the excess coolant is supplied to the reservoir tank 92. To fill.

  At this time, the air pressure in the reservoir tank 92 becomes equal to or higher than a certain pressure as the surplus cooling liquid filled in the reservoir tank 92 rises, and when the air pressure becomes larger than the urging force of the spring 60, The valve element 59 moves upward against the urging force, and the reservoir tank 92 and the air vent hole 57c communicate with each other. For this reason, the air separated from the coolant and stored in the reservoir tank 92 is discharged to the outside through the air vent hole 57c.

  Further, when the cooling liquid contracts due to the temperature drop, the water level of the cooling liquid in the reservoir tank 92 decreases, so that the shortage of the cooling liquid circulating in the engine 2 and the radiator 71 is replenished.

  As described above, in this embodiment, the pipe joint 91 that connects the engine hose 77 and the radiator hose 79 is provided, and the coolant that circulates between the engine 2 and the radiator 71 collides with the pipe joint 91 to forcibly flow the coolant. Since the air is separated from the coolant and the separated air can be stored in the reservoir tank 92, the air can be extracted from the pipe joint 91.

  For this reason, even when the piping path between the engine 2 and the radiator 71 becomes complicated, the pipe 91 that connects the engine hose 77 and the radiator hose 79 is used to separate the coolant and the air. Air venting can be performed simultaneously. As a result, the configuration of the cooling device can be simplified, and the manufacturing cost of the cooling device can be prevented from increasing.

  Moreover, in this Embodiment, since the pipe joint 91 was installed above the radiator 71, the isolate | separated air can be collected in the pipe joint 91 and air can be efficiently extracted from the pipe joint 91. FIG.

  In the present embodiment, since the cap member 57 having the pressure control valve 58 that opens the inside of the reservoir tank 92 to the outside when the air pressure in the reservoir tank 92 becomes equal to or higher than a certain pressure is provided. During operation, the coolant flowing through the engine 2 and the radiator 71 collides with the pipe joint 91 to forcibly change the flow of the coolant, thereby separating the air from the coolant, which is separated and stored in the reservoir tank 92. When the applied air pressure becomes equal to or higher than a certain pressure, the pressure control valve 58 can be opened to the outside.

  For this reason, even after the injection of the coolant, the air separated from the coolant can be periodically discharged to the outside, and the existing reservoir tank (see FIG. 1) for venting air can be eliminated. For this reason, it is possible to prevent cavitation due to air mixing into the water pump with a simple and low-cost configuration using the reservoir tank 92 integrated with the pipe joint 91, and to prevent overheating of the engine 2. Invitation can be prevented.

  Further, since the coolant can be injected from the opening 95a of the neck portion 95 provided in the reservoir tank 92, it is unnecessary to provide the radiator 71 with an opening for injecting the coolant.

  In addition, the reservoir tank 92 of the present embodiment has a capacity for storing surplus cooling liquid when the cooling liquid expands, and therefore, when the cooling liquid flowing between the engine 2 and the radiator 71 expands due to a temperature rise. Excess cooling liquid can be stored in the reservoir tank 92, and when the cooling liquid contracts due to a temperature drop, the insufficient cooling liquid can be replenished from the reservoir tank 92 between the engine 2 and the radiator 71. it can.

  In the present embodiment, the engine hose 77 and the radiator hose 79 are connected by the pipe joint 91. However, the engine hose 77 and the radiator hose 79 are integrally formed to provide a bent portion at a predetermined location. You may provide the neck part 95 which has the opening part 95a in a part.

  The embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  As described above, the cooling device for an internal combustion engine according to the present invention has an effect of separating air from the coolant with a simple configuration and removing the air accumulated in the bent portion of the pipe. The present invention is useful as a cooling device for an internal combustion engine in which a coolant is circulated between heat exchangers to cool the internal combustion engine.

1 is a diagram showing a first embodiment of a cooling device for an internal combustion engine according to the present invention, and is an overall configuration diagram of the cooling device for the internal combustion engine. FIG. 1 is an exploded view of one three-way branch pipe joint of a first embodiment of a cooling device for an internal combustion engine according to the present invention. FIG. 3 is an exploded view of the other three-way branch pipe joint of the first embodiment of the cooling device for the internal combustion engine according to the present invention. It is a figure which shows 2nd Embodiment of the cooling device of the internal combustion engine which concerns on this invention, and is a whole block diagram of the cooling device of an internal combustion engine. It is an exploded view of one three-way branch pipe joint of the second embodiment of the cooling device for an internal combustion engine according to the present invention. It is sectional drawing of one three-way branch pipe joint of 2nd Embodiment of the cooling device of the internal combustion engine which concerns on this invention, (a) shows the state where the water level of the cooling fluid in a reservoir tank is low, (b ) Is a diagram showing a state in which the water level in the reservoir tank is high. It is an exploded view of the other three-way branch pipe joint of the second embodiment of the cooling device for an internal combustion engine according to the present invention. It is a figure which shows 3rd Embodiment of the cooling device of the internal combustion engine which concerns on this invention, and is a whole block diagram of the cooling device of an internal combustion engine. It is an exploded view of the pipe joint of 3rd Embodiment of the cooling device of the internal combustion engine which concerns on this invention. It is a figure which shows 4th Embodiment of the cooling device of the internal combustion engine which concerns on this invention, and is a whole block diagram of the cooling device of an internal combustion engine. It is an exploded view of the pipe joint of 4th Embodiment of the cooling device of the internal combustion engine which concerns on this invention.

Explanation of symbols

1 vehicle 2 engine (internal combustion engine)
6 First radiator (heat exchanger)
7 Second radiator (heat exchanger)
20, 24 Engine hose (Internal combustion engine side piping)
20a, 24a One end part of engine hose 20b, 24b Other end part of engine hose 21, 25 Three-way branch pipe joint (pipe joint, bent part)
22, 26 First radiator hose (first heat exchanger side piping)
22a, 26a One end of the first radiator hose 22b, 26b The other end of the first radiator hose 23, 27 Second radiator hose (second heat exchanger side piping)
23a, 27a One end portion of the second radiator hose 23b, 27b The other end portion of the second radiator hose 27 The second radiator hose 27a One end portion 27b The other end portion 43, 47 Neck portion (air venting mechanism)
43a, 47a Opening (air venting mechanism)
44, 48 Cap member (Air venting mechanism)
23a, 27a One end part of the second radiator hose 51, 52 Three-way branch pipe joint (pipe joint, bent part)
53, 61 Reservoir tank 56, 64 Neck (air venting mechanism)
56a, 64a Opening (air venting mechanism)
57 Cap member (Air venting mechanism)
58 Pressure control valve (Air venting mechanism)
71 Radiator (heat exchanger)
77 Engine hose (Internal combustion engine side piping)
77a One end of the engine hose 77b Other end of the engine hose 78 Pipe joint (bent portion)
79 Radiator hose (Piping on heat exchanger side)
79a One end of the radiator hose 79b The other end of the radiator hose 84 Neck (air venting mechanism)
84a Opening 85 Cap member (Air venting mechanism)
91 Pipe joint (bent part)
92 reservoir tank 95 neck (air venting mechanism)
95a Opening (air venting mechanism)

Claims (8)

In the cooling apparatus for an internal combustion engine configured to cool the internal combustion engine by circulating a coolant between the internal combustion engine and the heat exchanger,
A cooling apparatus for an internal combustion engine, comprising: a pipe interposed between the internal combustion engine and the heat exchanger and having a bent portion at a predetermined location; and an air vent mechanism provided at the bent portion. In the cooling apparatus for an internal combustion engine configured to cool the internal combustion engine by circulating a coolant between the internal combustion engine and the heat exchanger,
A pipe that is interposed between the internal combustion engine and the heat exchanger and has a bent portion at a predetermined location, a reservoir tank provided in the bent portion, and an air vent mechanism provided in the reservoir tank. An internal combustion engine cooling device. The cooling apparatus for an internal combustion engine according to claim 1, wherein the bent portion is installed above the heat exchanger. The cooling apparatus for an internal combustion engine according to any one of claims 1 to 3, wherein the air vent mechanism is configured by a pressure control valve that is released when a pressure in the bent portion becomes a predetermined pressure or more. An opening formed in the reservoir tank; and a cap member detachably provided in the reservoir tank so as to open and close the opening; and the pressure control valve is provided in the cap member. The cooling device for an internal combustion engine according to any one of claims 2 to 4. The pipe has one end connected to the internal combustion engine, and an internal combustion engine side pipe through which a coolant flows,
One end is connected to the heat exchanger, the other end is connected to the other end of the internal combustion engine side pipe, and a heat exchanger side pipe through which coolant flows,
The said bending part is formed by bending, and consists of a pipe joint which connects the said internal combustion engine side piping and the said heat exchanger side piping, The any one of Claims 1-5 characterized by the above-mentioned. Cooling device for internal combustion engine. The heat exchanger includes a first heat exchanger and a second heat exchanger that are spaced apart from each other,
The heat exchanger side pipe has one end connected to the first heat exchanger and the other end connected to the other end of the internal combustion engine side pipe, and one end Is connected to the second heat exchanger and the other end is connected to the other end of the internal combustion engine side pipe, and the second heat exchanger side pipe is provided,
The pipe joint is bent at a predetermined portion so as to branch the first heat exchanger side pipe and the second heat exchanger side pipe from the internal combustion engine side pipe, and the other end of the internal combustion engine side pipe and the The cooling apparatus for an internal combustion engine according to claim 6, comprising a three-way branch pipe joint that connects the first heat exchanger side pipe and the other end of the second heat exchanger side pipe. The cooling device for an internal combustion engine according to any one of claims 2 to 7, wherein the reservoir tank has a volume for storing surplus cooling liquid when the cooling liquid expands.