JP2016090169A - Cooling device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device of an internal combustion engine which can reduce a pressure loss of cooling water flowing in second cooling water circulation piping arranged in the vicinity of a lower member while shortening a length of an engine room in a vehicle fore-and-aft direction.SOLUTION: A cooling device of an internal combustion engine comprises a radiator 17 which is arranged at an upper part of a lower member 12 extending in a vehicle width direction and a front part of a fore-and-aft direction with respect to an engine 6 which is arranged in an engine room 4. The radiator 17 comprises a lower tank 17C which is arranged at a lower part of a core part 17A, and has outlet piping 19 in which cooling water circulates. A notch 12A which is notched toward a front part from a rear end of the lower member 12 is formed at the lower member 12. The outlet piping 19 is extended in the vehicle width direction along the upper part of the lower member 12 from a connecting part 17c of the lower tank 17C, and connected to a connecting part 7b of a cylinder block 7 after being curved to a lower part of a vehicle 1 through the notch 12A.SELECTED DRAWING: Figure 5

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 provided with a radiator for cooling the internal combustion engine.

  As a cooling device provided in a vehicle such as an automobile, a radiator is provided above a lower member extending in the vehicle width direction and in front of the vehicle in the front-rear direction of the internal combustion engine provided in an engine room. Those are known (for example, see Patent Document 1).

  This radiator includes a lower tank below a core portion that cools cooling water, and an outlet pipe that introduces cooling water into the internal combustion engine is provided in the lower tank.

JP 2003-207296 A

In such a conventional cooling device for an internal combustion engine, it is necessary to extend the outlet pipe from the lower tank to the internal combustion engine while avoiding the lower member, and therefore it is necessary to bend the outlet pipe rapidly.
For this reason, the pressure loss of cooling water may increase, and the cooling performance of the internal combustion engine may deteriorate.

  On the other hand, in order to prevent the pressure loss of the cooling water from increasing, it is necessary to gently curve the outlet pipe. However, in order to gently curve the outlet pipe, it is necessary to increase the longitudinal clearance of the vehicle between the radiator or the lower member that supports the radiator and the internal combustion engine.

  For this reason, it is necessary to lengthen the length of the engine room in the front-rear direction of the vehicle, and the length of the passenger compartment in the front-rear direction of the vehicle may be shortened accordingly. Further, in order to increase the length of the vehicle interior in the front-rear direction of the vehicle, it is necessary to increase the length of the vehicle in the front-rear direction, which makes it difficult to reduce the size of the vehicle.

  The present invention has been made paying attention to the above-described problems. The second cooling water circulation pipe provided in the vicinity of the lower member is shortened while reducing the length of the engine room in the front-rear direction of the vehicle. It is an object of the present invention to provide a cooling device for an internal combustion engine that can reduce the pressure loss of flowing cooling water.

  The present invention has a radiator installed above a lower member extending in the width direction of the vehicle and in front of the vehicle in the front-rear direction of the internal combustion engine provided in the engine room, and the internal combustion engine cools the internal combustion engine. A first engine-side cooling water circulation part and a second engine-side cooling water circulation part that circulate water are provided, and a radiator is installed at a core part that cools the cooling water and an upper part of the core part. An upper tank having a first radiator side cooling water circulation part, a lower tank having a second radiator side cooling water circulation part which is installed at a lower part of the core part and through which the cooling water flows, and a first radiator side cooling water circulation A first cooling water circulation pipe, a second radiator side cooling water circulation part, and a second radiator connecting the first part and the first engine side cooling water circulation part to distribute the cooling water between the internal combustion engine and the radiator. Engine side cooling water distribution And a second cooling water circulation pipe for circulating the cooling water between the internal combustion engine and the radiator, the cooling device for the internal combustion engine from the rear end in the front-rear direction of the vehicle to the lower member A notch is formed by cutting forward in the front-rear direction, and the second cooling water circulation pipe extends from the second radiator side cooling water circulation along the upper side of the lower member in the width direction of the vehicle. After being bent downward through the notch, the vehicle is connected to the second engine-side cooling water circulation part.

According to the present invention, the lower member is formed with a notch portion that is notched from the rear end in the front-rear direction of the vehicle toward the front in the front-rear direction of the vehicle, and the second cooling water circulation pipe is provided with the second radiator side cooling. It extends in the width direction of the vehicle along the upper part of the lower member from the water circulation part, and is bent to the lower side of the vehicle through the notch part, and then connected to the second engine side cooling water circulation part.
As a result, the second cooling water circulation pipe can be gently curved and installed between the radiator and the internal combustion engine, and the pressure loss of the cooling water flowing through the second cooling water circulation pipe can be reduced.

  Further, since the second cooling water circulation pipe can be gently curved to bring the second cooling water circulation pipe closer to the radiator or the lower member, the length of the vehicle in the front-rear direction of the radiator or the lower member and the internal combustion engine is shortened. It is possible to shorten the length of the engine room in the front-rear direction of the vehicle. For this reason, even if the longitudinal length of the vehicle in the passenger compartment is increased, the vehicle can be reduced in size.

FIG. 1 is a diagram showing an embodiment of a cooling device for an internal combustion engine according to the present invention, and is a side view of a front portion of a vehicle. FIG. 2 is a diagram showing an embodiment of the cooling apparatus for an internal combustion engine of the present invention, and is a plan view of the front portion of the vehicle. FIG. 3 is a view showing an embodiment of the cooling apparatus for an internal combustion engine of the present invention, and is a front view of the front portion of the vehicle. FIG. 4 is a view showing an embodiment of the cooling apparatus for an internal combustion engine of the present invention, and is a rear view of the front portion of the vehicle. FIG. 5 is a view showing an embodiment of the cooling device for an internal combustion engine of the present invention, and is a bottom view of the front portion of the vehicle. FIG. 6 is a view showing an embodiment of the cooling apparatus for an internal combustion engine according to the present invention, which is a bottom view of the front portion of the vehicle, and shows a lower member having a different shape.

Embodiments of a cooling apparatus for an internal combustion engine according to the present invention will be described below with reference to the drawings.
FIGS. 1-6 is a figure which shows the cooling device of the internal combustion engine of one Embodiment which concerns on this invention.
First, the configuration will be described. 1 to 6, the left and right and front and rear directions represent the left and right and front and rear directions of the vehicle as viewed from the driver's seat. Further, front and rear indicate the front-rear direction front and the front-rear direction rear of the vehicle 1.

  1 and 2, a vehicle 1 such as an automobile includes a vehicle body 2, and the vehicle body 2 includes an engine room 4 on the front side of the vehicle 1 and a vehicle room 5 on the rear side of the vehicle 1 by a dash panel 3. Partitioned.

  The engine room 4 is provided with an engine 6 as an internal combustion engine. The engine 6 includes a cylinder block 7, a cylinder head 8 provided at the upper part of the cylinder block 7, and an oil pan 9 provided at the lower part of the cylinder block 7.

  The cylinder block 7 houses a piston (not shown) accommodated in a cylinder (not shown) so as to be movable up and down, a crankshaft (not shown) that converts the vertical movement of the piston into a rotational motion, and the like.

  A transmission 10 is attached to the left end of the cylinder block 7 in the width direction of the vehicle 1 (hereinafter, the width direction of the vehicle 1 is referred to as the vehicle width direction). Transmit power to the wheel.

  1 to 3, an upper member 11 and a lower member 12 are provided on the front side of the engine room 4, and the upper member 11 and the lower member 12 extend in the vehicle width direction.

  The upper member 11 and the lower member 12 are connected at both ends in the vehicle width direction by side braces 13 and 14 (see FIG. 3), and the engine room 4 is located behind the upper member 11, the lower member 12 and the side braces 13 and 14. ing. In addition, the lower member 12 of this embodiment is comprised from resin members, such as a plastics. However, the lower member 12 is not limited to the resin member, and may be a metal member.

  Side members 15 and 16 are attached to the side braces 13 and 14 (see FIG. 2). The side members 15 and 16 extend in the front-rear direction of the vehicle 1, and the engine 6 and the transmission 10 are elastically supported by the side members 15 and 16.

  In FIG. 1, the engine 6 is provided behind the upper member 11 and the lower member 12 in the engine room 4. A radiator 17 is installed above the lower member 12 and in front of the engine 6 provided in the engine room 4, and the radiator 17 is fixed to the lower member 12 (see FIGS. 2 and 3). .

  The radiator 17 and the engine 6 are installed such that a vehicle width direction center portion 91 of the radiator 17 and a vehicle width direction center portion 92 of the engine 6 are shifted in the vehicle width direction (see FIG. 2). Specifically, the engine 6 is installed to be shifted to the right side in the vehicle width direction with respect to the radiator 17, and the radiator 17 is installed to be shifted to the left side in the vehicle width direction with respect to the engine 6.

  The radiator 17 includes a core portion 17A for cooling the cooling water by heat exchange with air, an upper tank 17B provided at the upper portion of the core portion 17A, and a lower tank 17C provided at the lower portion of the core portion 17A.

  1, 2, and 4, a connecting portion 17 b is formed in the upper tank 17 </ b> B, and one end portion of an inlet pipe 18 is attached to the connecting portion 17 b (see FIGS. 1 to 4). The cylinder block 7 is provided with a connecting portion 7a, and the other end of the inlet pipe 18 is connected to the connecting portion 7a (see FIG. 2). The connecting portion 7a includes a thermostat (not shown).

  1 to 4, a connecting portion 17c is formed at one end of the lower tank 17C in the vehicle width direction, and one end of an outlet pipe 19 is attached to the connecting portion 17c. The cylinder block 7 is provided with a connection portion 7b, and the other end portion of the outlet pipe 19 is connected to the connection portion 7b (see FIG. 2).

  The cylinder block 7 is provided with a water pump (not shown) downstream of the connection portion 17c, and the cooling water flowing through the connection portion 17c is sucked into the water pump.

  The inlet pipe 18 introduces cooling water led out from the cylinder block 7 through the connection portion 7a into the upper tank 17B through the connection portion 17b. The radiator 17 exchanges heat between the cooling water introduced into the upper tank 17B and traveling wind by the core portion 17A. The cooling water heat-exchanged with the traveling wind is introduced from the core portion 17A into the lower tank 17C and then introduced into the outlet pipe 19 through the connection portion 17c.

  The outlet piping 19 introduces the low-temperature cooling water cooled by the core portion 17A into the cylinder block 7 and the cylinder head 8 through the connection portion 7b. Thereby, each part of the engine 6 is cooled by the cooling water.

  In addition, one end of a bypass pipe (not shown) is connected to the connection portion 7 a, and the other end of the bypass pipe is connected to the outlet pipe 19. In the connection portion 7a, when the thermostat detects that the cooling water has become low temperature (for example, less than the warm-up temperature), the thermostat bypasses the radiator 17 and connects the inlet pipe 18 and the outlet pipe 19 to each other. Form. Thereby, the cooling water passes through the bypass pipe, and the engine 6 can be warmed up early.

Here, the connection part 17b of this embodiment comprises the 1st radiator side cooling water circulation part of this invention, and the connection part 7a comprises the 1st engine side cooling water passage circulation part of this invention. In addition, the inlet pipe 18 of the present embodiment constitutes the first cooling water circulation pipe of the present invention, and the outlet pipe 19 constitutes the second cooling water circulation pipe of the present invention.
Moreover, the connection part 17c of this embodiment comprises the 2nd radiator side cooling water circulation part of this invention, and the connection part 7b comprises the 2nd engine side cooling water passage circulation part of this invention.

  1 and 2, a catalytic converter 25 is provided in front of the engine 6. The catalytic converter 25 purifies exhaust gas discharged from the engine 6 through the exhaust manifold 26 into an exhaust pipe (not shown). Discharge. Further, the catalytic converter 25 is provided on the right side in the vehicle width direction with respect to the radiator 17, and the radiator 17 is not affected by the high-temperature heat of the catalytic converter 25. An intake manifold 27 is provided behind the engine 6, and the intake manifold 27 introduces air sucked from the intake duct 28 through the air cleaner 29 into the engine 6.

  2-5, the lower member 12 is formed with a notch 12A, and the notch 12A is notched forward from the rear end.

  The outlet pipe 19 extends from the connecting portion 17c of the lower tank 17C in the vehicle width direction along the upper portion of the lower member 12, and is further curved below the vehicle 1 through the notch 12A, and then connected to the cylinder block 7. Connected to the unit 7b.

  Specifically, the outlet pipe 19 is connected to the upstream pipe part 19A that extends from the connection part 17c to the notch part 12A along the upper portion of the lower member 12, and the upstream pipe part 19A, and from the upstream pipe part 19A to the notch part 12A. A curved piping section 19B that extends curvedly downward through the vehicle 1 and a downstream piping section that continues to the curved piping section 19B and extends upward from the curved piping section 19B and is connected to the connecting section 7b of the cylinder block 7 19C.

  Here, the upstream piping portion 19A of the present embodiment constitutes the first piping portion of the present invention, and the downstream piping portion 19C constitutes the second piping portion of the present invention. Further, upstream and downstream indicate upstream and downstream with respect to the direction in which the cooling water flows.

  Moreover, as for the outlet piping 19 of this embodiment, the curved piping part 19B is comprised from elastic members, such as rubber | gum. The elastic member is not limited to rubber and is not particularly limited as long as it is a flexible elastic member.

  2, 3, and 5, the lower member 12 is provided with an attachment portion 20, and the attachment portion 20 is attached to an upstream piping portion 19 </ b> A of the outlet piping 19. The attachment portion 20 is formed of, for example, a U-shaped semicircular ring or a binding band. The attachment portion 20 fixes the upstream piping portion 19A to the lower member 12 so as to sandwich the upstream piping portion 19A. doing. In addition, as a structure of the attachment part 20, as long as the upstream piping part 19A can be fixed to the lower member 12, what kind of thing may be sufficient.

  Further, the attachment portion 20 of the present embodiment is installed closer to the notch portion 12A than the connection portion 17c, and the upstream piping portion 19A is fixed closer to the notch portion 12A by the attachment portion 20.

  The notch 12A is formed between the connecting portion 7b of the cylinder block 7 and the connecting portion 17c of the lower tank 17C in the vehicle width direction. In FIG. 5, the curvature of the first curved surface 21 from the rear end 12a on the connecting portion 7b side in the vehicle width direction at the notch 12A to the front end edge 12c in the front-rear direction of the vehicle 1 is the vehicle width at the notch 12A. It is formed smaller than the curvature of the second curved surface 22 from the rear end 12b to the front end edge 12c on the direction connecting portion 17c side.

Here, the front end edge 12c of the notch 12A in the front-rear direction of the vehicle 1 is the frontmost edge in the front-rear direction of the vehicle 1 among the peripheral edges of the notch 12A.
The distance L1 in the vehicle width direction from the rear end 12a on the connection portion 7b side of the notch 12A to the front end edge 12c is the vehicle width from the rear end 12b on the connection portion 17c side of the notch 12A to the front end edge 12c. It is formed longer than the direction distance L2.

  Moreover, the connection parts 17b and 17c of this embodiment, the connection parts 7a and 7b, the radiator 17, the inlet piping 18, and the outlet piping 19 comprise the cooling device of this invention.

Next, the operation will be described.
The radiator 17 installed on the upper part of the lower member 12 has an outlet pipe 19 extending from the lower tank 17C to the engine 6 in the vicinity of the lower member 12. Therefore, it is necessary to extend the outlet pipe 19 to the engine 6 while avoiding the lower tank 17C. . Thereby, it is necessary to bend the outlet piping 19 rapidly.
For this reason, the pressure loss of cooling water from the engine 6 may increase, and the cooling performance of the engine 6 may deteriorate.

  On the other hand, in order to prevent an increase in the pressure loss of the cooling water, it is necessary to gently curve the outlet pipe 19, but in order to gently curve the outlet pipe 19, the radiator 17 or the lower member 12 and the engine 6 It is necessary to increase the gap in the front-rear direction.

  On the other hand, according to the cooling device of the present embodiment, the lower member 12 is formed with the notch 12A that is notched forward from the rear end of the lower member 12, and the outlet pipe 19 is connected to the lower tank 17C. After extending in the vehicle width direction along the upper part of the lower member 12 from the part 17c and curving downward of the vehicle 1 through the notch part 12A, it was connected to the connecting part 7b of the cylinder block 7.

  As a result, the outlet pipe 19 can be gently bent and installed between the radiator 17 and the engine 6, and the pressure loss of the cooling water flowing through the outlet pipe 19 can be reduced.

  Further, since the outlet pipe 19 can be gently bent and the outlet pipe 19 can be brought close to the radiator 17 and the lower member 12, the length of the radiator 17, the lower member 12 and the engine 6 in the front-rear direction can be shortened. The length in the front-rear direction can be shortened. For this reason, even if the length in the front-rear direction in the passenger compartment 5 is increased, the size of the vehicle 1 can be reduced.

  Further, the outlet pipe 19 is bent downwardly through the outlet pipe 19 in the notch 12A formed in the lower member 12, so that the outlet pipe 19 is formed in a narrow space in the front-rear direction between the engine 6 and the radiator 17 or the lower member 12. A portion that hangs smoothly below the vehicle 1 can be provided.

  As a result, when the engine 6 swings around the crankshaft, the outlet pipe 19 can be swung in a narrow space. For this reason, it is possible to prevent an excessive tensile load from being applied from the outlet pipe 19 to the connection portion 7b and the connection portion 17c. As a result, it is possible to prevent a large load from being applied to the radiator 17 and the outlet pipe 19 and to improve the reliability of the cooling device.

  Further, according to the cooling device of the present embodiment, the outlet pipe 19 is connected to the upstream pipe part 19A extending from the connection part 17c to the notch part 12A along the upper part of the lower member 12, and the upstream pipe part 19A, and the upstream pipe. A curved pipe part 19B that curves and extends downward from the part 19A through the notch part 12A and the curved pipe part 19B, and extends upward from the curved pipe part 19B and is connected to the connection part 7b. 19 C of downstream piping parts, and among the upstream piping part 19A, the curved piping part 19B, and the downstream piping part 19C, at least the curved piping part 19B was comprised from the elastic member.

  As a result, when the engine 6 swings around the crankshaft, the vibration due to the swing of the engine 6 can be absorbed by the curved piping portion 19B, and the upstream piping portion 19A and the downstream piping portion 19C are excessively accompanied by the vibration of the engine 6. A tensile force can be prevented from being applied.

  In the cooling device of the present embodiment, the curved pipe portion 19B is made of an elastic member, but the curved pipe portion 19B and the upstream pipe portion 19A may be made of an elastic member, and the curved pipe portion 19B and the downstream pipe portion 19C. You may comprise from an elastic member. Furthermore, you may comprise the upstream piping part 19A, the curved piping part 19B, and the downstream piping part 19C from an elastic member.

  Further, according to the cooling device of the present embodiment, the lower member 12 made of a resin member is provided with the attachment portion 20 for attaching the outlet pipe 19 to the lower member 12, and the attachment portion 20 is connected to the notch portion 12A side by the connection portion 17c. Installed.

  Thereby, when the engine 6 swings around the crankshaft, the outlet pipe 19 can be prevented from swinging significantly in the notch 12A due to the vibration caused by the swing of the engine 6. For this reason, it can prevent that the inner periphery of notch 12A and the outlet piping 19 interfere, and the outlet piping 19 can be protected.

  Further, since the outlet pipe 19 can be prevented from largely swinging in the notch 12A, the outlet pipe 19 can be installed close to the front end edge in the front-rear direction of the notch 12A. Thereby, the engine 6 can be brought close to the lower member 12 or the radiator 17 in the front-rear direction, and the length of the engine room 4 in the front-rear direction can be shortened.

  Further, according to the cooling device of the present embodiment, the notch portion 12A is formed between the connection portion 17c and the connection portion 7b in the vehicle width direction, and from the rear end 12a on the connection portion 7b side of the notch portion 12A. The curvature of the first curved surface 21 up to the front edge 12c was formed to be smaller than the curvature of the second curved surface 22 from the rear end 12b on the connecting portion 17c side of the notch 12A to the front edge 12c.

  In addition, the distance L1 in the vehicle width direction from the rear end 12a on the connection portion 7b side of the notch 12A to the front end edge 12c is determined from the rear end 12b on the connection portion 17c side in the vehicle width direction of the notch 12A. It was formed longer than the distance L2 in the vehicle width direction to the front edge 12c.

  As a result, when the outlet pipe 19 extending from the radiator 17 is passed through the notch 12A and the outlet pipe 19 is bent in the notch 12A, the outlet pipe 19 is more bent by the wide first curved surface 21 having a small curvature. It can be curved more gently. As a result, the pressure loss of the cooling water flowing through the outlet pipe 19 can be more effectively reduced.

  Further, since the curvature of the second curved surface 22 on the connection portion 17c side can be larger than the curvature of the first curved surface 21 on the connection portion 7b side, the substantial part of the lower member 12 (the portion where the notch portion 12A is not formed) ) Can be increased.

  As a result, the attachment portion 20 can be attached to the lower member 12 so as to be closer to the notch portion 12A. Therefore, the upstream piping portion 19A can be supported by the mounting portion 20 at a position closer to the notch portion 12A, and the curved piping portion 19B of the outlet piping 19 is more effectively prevented from being excessively swung due to the swinging of the engine 6. it can.

  In the cooling device of this embodiment, the inlet pipe 18 is attached to the upper tank 17B, and the outlet pipe 19 is attached to the lower tank 17C. However, the present invention is not limited to this.

  For example, the inlet pipe 18 may be attached to the lower tank 17C, and the outlet pipe 19 may be attached to the upper tank 17B. In this case, the cooling water introduced from the engine 6 to the lower tank 17C through the inlet pipe 18 is cooled by the core portion 17A and then introduced from the upper tank 17B to the engine 6 through the outlet pipe 19.

  Further, the cooling device of the present embodiment uses the curvature of the first curved surface 21 from the rear end 12a on the connection part 7b side of the notch part 12A to the front end edge 12c as the rear end on the connection part 17c side of the notch part 12A. Although it formed smaller than the curvature of the 2nd curved surface 22 from 12b to the front-end edge 12c, it is not limited to this.

  For example, as shown in FIG. 6, the curvature of the curved surface 23 from the rear end 12a on the connecting portion 7b side in the vehicle width direction to the front end edge 12c in the notched portion 12A is the same, and the connecting portion 7b side of the notched portion 12A is used. A distance L3 in the vehicle width direction from the rear end 12a to the front end edge 12c and a distance L3 in the vehicle width direction from the rear end 12b on the connection portion 17c side of the notch 12A to the front end edge 12c are formed at the same distance. May be.

  However, in this case, it is preferable to make the curvature of the curved surface 23 smaller than the curvature of the second curvature surface 22. In this way, the outlet pipe 19 can be bent more gently by the wide curved surface 23 having a small curvature.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

DESCRIPTION OF SYMBOLS 1 ... Vehicle, 4 ... Engine room, 6 ... Engine (internal combustion engine), 7a ... Connection part (1st engine side cooling water channel distribution part, cooling device), 7b ... Connection Part (second engine side coolant passage circulation part, cooling device), 12 ... lower member, 12A ... notch part, 12a ... rear end (second part in width direction of vehicle in notch part) Rear end of engine side cooling water circulation part), 12b... Rear end (rear end of second radiator side cooling water circulation part in width direction of vehicle in notch), 12c. Front edge of the notch), 17 ... Radiator (cooling device), 17A ... Core portion, 17B ... Upper tank, 17b ... Connection portion (first radiator side cooling water circulation portion, cooling device) ), 17C ... Lower tank, 17c ... Connection part (second radiator side cooling water circulation part, cooling device), 18 ... Inlet pipe (first cooling water circulation pipe, cooling device) , 19 ... Outlet piping (second cooling water circulation piping, cooling device), 19A ... Upstream piping (first piping), 19B ... Curved piping, 19C ... Downstream piping (2nd piping part), 20 ... attachment part, 21 ... 1st curved surface, 22 ... 2nd curved surface, 91 ... vehicle width direction center part (width of vehicle in radiator) Direction central portion), 92 ... vehicle width direction center portion (vehicle width direction center portion of the internal combustion engine)

Claims (4)

A radiator installed above the lower member extending in the width direction of the vehicle and in front of the vehicle in the front-rear direction with respect to the internal combustion engine provided in the engine room;
The internal combustion engine includes a first engine-side cooling water circulation section and a second engine-side cooling water circulation section for circulating cooling water to the internal combustion engine;
The radiator is a core part that cools cooling water; an upper tank that is installed at an upper part of the core part and has a first radiator side cooling water circulation part through which cooling water flows; and is installed at a lower part of the core part. A lower tank having a second radiator side cooling water circulation part through which the cooling water circulates, and the first radiator side cooling water circulation part and the first engine side cooling water circulation part are connected; Connecting the first cooling water circulation pipe for circulating the cooling water between the radiator, the second radiator side cooling water circulation part and the second engine side cooling water circulation part, and the internal combustion engine and the A cooling device for an internal combustion engine, comprising: a second cooling water circulation pipe for circulating cooling water to and from a radiator;
Formed in the lower member is a notch cut out from the rear end in the front-rear direction of the vehicle toward the front in the front-rear direction of the vehicle;
After extending the second cooling water circulation pipe from the second radiator side cooling water circulation part along the upper side of the lower member in the width direction of the vehicle and bending the second cooling water circulation pipe downward of the vehicle through the notch A cooling apparatus for an internal combustion engine, connected to the second engine side cooling water circulation section. The second cooling water circulation pipe is continuous with the first piping part extending from the second radiator side cooling water circulation part to the notch part along the upper part of the lower member, and the first piping part. A curved piping portion extending curvedly downward from the first piping portion through the notch and the curved piping portion, and extending upward from the curved piping portion to the second. And a second pipe connected to the engine-side cooling water circulation part.
2. The cooling device for an internal combustion engine according to claim 1, wherein at least the curved piping portion is made of an elastic member among the first piping portion, the curved piping portion, and the second piping portion. The lower member is made of a resin member,
The lower member has an attachment portion for attaching the second cooling water circulation pipe to the lower member;
The cooling device for an internal combustion engine according to claim 1 or 2, wherein the attachment portion is installed closer to the notch portion than the second radiator side cooling water circulation portion. The radiator and the internal combustion engine are installed such that a center portion in the width direction of the vehicle in the radiator and a center portion in the width direction of the vehicle in the internal combustion engine are shifted in the width direction of the vehicle,
The notch is formed between the second radiator side cooling water circulation part and the second engine side cooling water circulation part in the width direction of the vehicle,
The curvature of the first curved surface from the rear end on the second engine side cooling water circulation portion side in the width direction of the vehicle in the notch portion to the front end edge in the front-rear direction of the vehicle is expressed as the curvature in the notch portion. Forming smaller than the curvature of the second curved surface from the rear end of the second radiator side cooling water circulation part side in the vehicle width direction to the front end edge;
The distance in the width direction of the vehicle from the rear end of the notch portion on the second engine side cooling water circulation portion side to the front end edge is defined as the second radiator side cooling water circulation portion side of the notch portion. The cooling device for an internal combustion engine according to any one of claims 1 to 3, wherein the cooling device is formed longer than a distance in a width direction of the vehicle from a rear end to the front end edge.

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