Engine cooling system

Abstract

To provide a cooling device of an engine capable of improving connection rigidity of a cooling water introduction case to a cover member, and reducing vibration of the cover member and the cooling water introduction case.SOLUTION: An expansion portion 27 has: a first case mounting boss portion 28A to which a lower portion 50A of a cooling water introduction case 50 is fastened by a bolt 11; a second case mounting boss portion 28B to which an upper portion 50B of the cooling water introduction case 50 is fastened by a bolt 11; a first flange portion 29A extending to a side part of a first cover mounting boss portion 26A from a cooling water introduction port 30; and a second flange portion 29B extending to a side part of a second cover mounting boss portion 26B from the cooling water introduction port 30. The first case mounting boss portion 28A and the second case mounting boss portion 28B are respectively disposed on tip end portions in an extending direction, of the first flange portion 29A and the second flange portion 29B and connected to the first cover mounting boss portion 26A and the second cover mounting boss portion 26B.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an engine cooling device. [Background technology]

[0002] Patent document 1 describes an engine cooling structure in which a water pump for circulating cooling water in an engine in which cover members are arranged on the sides of the cylinder block and crankcase is formed by the cover member and an outer member attached to the surface of the cover member, and the cover member itself is used as a component of the water pump.

[0003] In this engine cooling structure, a cooling water inlet case that takes in cooling water to the water pump is integrally formed with the cylinder block, and this cooling water inlet case is connected to a cover member. According to the technology described in Patent Document 1, the water pump can be installed compactly on the side of the engine, and a cooling water passage can be formed between the water pump and the oil cooler without using a separate hose or the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-174022 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the technology described in Patent Document 1, the cooling water inlet case is integrally formed with the cylinder block, which limits the position and orientation of the cooling water inlet case, reducing the degree of freedom in setting the direction in which the cooling water is introduced into the water pump.

[0006] On the other hand, in order to freely set the direction in which the coolant is introduced into the water pump, it is possible to connect a coolant inlet case formed separately from the cylinder block directly to the side wall of the cover member facing the cylinder block. However, when connecting the coolant inlet case to the cover member, it is necessary to increase the connection rigidity of the coolant inlet case to the cover member, and if this connection rigidity is insufficient, there is a problem in that vibration of the cover member and the coolant inlet case increases.

[0007] The present invention has been made in light of the above-mentioned circumstances, and aims to provide an engine cooling device that can improve the connection rigidity of the cooling water inlet case to the cover member and reduce vibration of the cover member and the cooling water inlet case. [Means for solving the problem]

[0008] The present invention provides an engine cooling device comprising: a cover member having a joint portion joined to an end of an engine body, a plurality of cover mounting boss portions arranged along the joint portion and fastened to the end of the engine body with bolts, and an extension portion formed by extending outward from the joint portion and not joined to the end of the engine body; a water pump arranged in the extension portion; and a coolant inlet case having a coolant inlet passage for introducing coolant into a coolant inlet of the water pump and fastened to a side surface of the extension portion on the engine body side with bolts, wherein the plurality of cover mounting boss portions are a first cover mounting boss portion arranged below the water pump and a second cover mounting boss portion arranged above the water pump. and a bar mounting boss portion, wherein the extension portion has a first case mounting boss portion to which the lower portion of the cooling water inlet case is fastened with a bolt, a second case mounting boss portion to which the upper portion of the cooling water inlet case is fastened with a bolt, a first flange portion extending from the cooling water inlet to the side of the first cover mounting boss portion, and a second flange portion extending from the cooling water inlet to the side of the second cover mounting boss portion, wherein the first case mounting boss portion is located at the tip of the extension direction of the first flange portion and is connected to the first cover mounting boss portion, and the second case mounting boss portion is located at the tip of the extension direction of the second flange portion and is connected to the second cover mounting boss portion. [Effects of the Invention]

[0009] As described above, according to the present invention, it is possible to provide an engine cooling device that can improve the connection rigidity of the coolant inlet case to the cover member and reduce vibration of the cover member and the coolant inlet case. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a front view of an engine equipped with an engine cooling device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a side view of an engine equipped with an engine cooling device according to one embodiment of the present invention. [Figure 3] FIG. 3 is a perspective view of a chain case of an engine equipped with an engine cooling device according to one embodiment of the present invention. [Figure 4] FIG. 4 is a front view of a chain case with a water pump cover removed from an engine equipped with a cooling device for an engine according to one embodiment of the present invention. [Figure 5] FIG. 5 is a rear view of a chain case of an engine equipped with a cooling device for an engine according to one embodiment of the present invention. [Figure 6] FIG. 6 is a rear view showing the mounting structure of the first cooling water inlet case of the chain case of the engine equipped with the engine cooling device according to one embodiment of the present invention. [Figure 7] FIG. 7 is a rear view showing the mounting structure of the second coolant inlet case of the chain case of the engine equipped with the engine cooling device according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] An engine cooling device according to one embodiment of the present invention is an engine cooling device including: a cover member having a joint portion joined to an end of an engine body; a plurality of cover mounting boss portions arranged along the joint portion and fastened to the end of the engine body with bolts; and an extension portion formed by extending outward from the joint portion and not joined to the end of the engine body; a water pump arranged on the extension portion; and a coolant inlet case having a coolant inlet passage for introducing coolant into a coolant inlet of the water pump and fastened to a side surface of the extension portion on the engine body side with bolts, wherein the plurality of cover mounting boss portions include a first cover mounting boss portion arranged below the water pump and a second cover mounting boss portion arranged below the water pump. and a second cover mounting boss portion arranged above the cooling water inlet case, and the extension portion has a first case mounting boss portion to which the lower portion of the cooling water inlet case is fastened with a bolt, a second case mounting boss portion to which the upper portion of the cooling water inlet case is fastened with a bolt, a first flange portion extending from the cooling water inlet to the side of the first cover mounting boss portion, and a second flange portion extending from the cooling water inlet to the side of the second cover mounting boss portion, wherein the first case mounting boss portion is arranged at the tip of the first flange portion in the extension direction and is connected to the first cover mounting boss portion, and the second case mounting boss portion is arranged at the tip of the second flange portion in the extension direction and is connected to the second cover mounting boss portion.

[0012] As a result, the engine cooling device according to one embodiment of the present invention can improve the connection rigidity of the coolant inlet case to the cover member, and can reduce vibration of the cover member and the coolant inlet case. [Example]

[0013] An engine cooling device according to an embodiment of the present invention will now be described with reference to the drawings, in which: Figures 1 to 7 are diagrams showing an engine cooling device according to an embodiment of the present invention.

[0014] 1 to 7, the up-down, front-rear, left-right directions are based on the state in which the engine is removed from the vehicle and held upright with the cylinder head directly above the crankshaft. The front-rear direction is shown to coincide with the front-rear direction of the vehicle in which the internal combustion engine is mounted.

[0015] 1 and 2, engine 1 includes an engine body 1A and a water pump 40 that circulates coolant through engine body 1A. Water pump 40 has a water pump pulley 41 and is operated by power transmitted from the crankshaft to water pump pulley 41 via an accessory belt (not shown).

[0016] The engine body 1A includes a cylinder block 2, a cylinder head 3, a cylinder head cover 4, and an oil pan 5. The cylinder block 2 is provided with a crankshaft 2A, which extends in the front-rear direction.

[0017] The cylinder block 2 has three cylinders (not shown) arranged in the front-to-rear direction, and the cylinders extend in the up-to-down direction. The engine 1 of this embodiment is a front-engine, rear-wheel drive (FR) type engine mounted vertically. Note that the engine 1 is not limited to an in-line engine, and may be, for example, a V-type engine, and the number of cylinders is not limited to three.

[0018] The cylinder head 3 is provided above the cylinder block 2. The cylinder head 3 has an intake port (not shown) for taking in air, an exhaust port 3B (see FIG. 2) for discharging exhaust gas, and intake and exhaust valves (not shown). The intake port opens on the right side wall of the cylinder head 3, and the exhaust port 3B opens on the left side wall of the cylinder head 3.

[0019] A cylinder head cover 4 is provided above the cylinder head 3 and covers the upper part of the cylinder head 3. An oil pan 5 is provided below the cylinder block 2. The oil pan 5 stores oil for lubricating the engine body 1A.

[0020] A timing chain and a variable valve timing mechanism (not shown) are provided at the front end of the engine body 1A. The engine body 1A is equipped with a chain case 20, which is fixed to the front end surfaces of the cylinder block 2 and the cylinder head 3 so as to cover the timing chain and the variable valve timing mechanism from the front.

[0021] The edges of the chain case 20 are fixed to the cylinder block 2 and the cylinder head 3 with multiple bolts 10. A bulging portion 21 that covers the variable valve timing mechanism is formed at the top of the chain case 20, and this bulging portion 21 bulges in the crankshaft direction (forward). The central and lower portions of the chain case 20 are formed with flat portions 22 that do not bulge in the crankshaft direction and are formed flat overall.

[0022] The chain case 20 has a joint 20A that is joined to an end of the engine body 1A. The joint 20A is formed on the edge of the chain case 20. The joint 20A has a joint surface 20B (see FIG. 2), and is joined to the engine body 1A at this joint surface 20B.

[0023] The chain case 20 has a cover mounting boss 25, a first cover mounting boss 26A, and a second cover mounting boss 26B. The cover mounting boss 25, the first cover mounting boss 26A, and the second cover mounting boss 26B are arranged along the joint 20A and are fastened to the end of the engine body 1A with bolts 10. The cover mounting boss 25, the first cover mounting boss 26A, and the second cover mounting boss 26B constitute the cover mounting bosses of the present invention.

[0024] In Figure 3, chain case 20 has an expansion portion 27, which is formed to expand outward to the left of joint portion 20A. Water pump 40 is disposed in expansion portion 27. Expansion portion 27 is not joined to an end of engine body 1A, but is joined to a coolant inlet case 50, which will be described later. Expansion portion 27 forms part of the housing of water pump 40 and also forms a diamond-shaped flange for connecting water pump 40 to coolant inlet case 50.

[0025] 2 and 3, engine 1 is provided with a coolant inlet case 50. Coolant inlet case 50 is fastened with bolts 11 to the side surface of expansion portion 27 on the engine main body 1A side. As shown in FIG. 6, coolant inlet case 50 has a coolant inlet passage 51C that introduces coolant to coolant inlet port 30 of water pump 40. A thermostat (not shown) is housed in coolant inlet passage 51C, and the thermostat opens and closes in response to the temperature of the coolant to adjust the flow rate of the coolant.

[0026] As shown in Figures 6 and 7, the cooling water inlet case 50 is composed of a first cooling water inlet case 51 arranged on the rear surface of the expansion section 27 and a second cooling water inlet case 52 arranged on the rear surface of this first cooling water inlet case 51.

[0027] The first cooling water inlet case 51 is provided with connection parts 51A and 51B, and cooling water piping (not shown) is connected to the connection parts 51A and 51B. The connection part 51A opens toward the rear, and the connection part 51B opens toward the front. The second cooling water inlet case 52 is provided with a connection part 52A, and a cooling water piping (not shown) is connected to the connection part 52A. The connection part 52A opens toward the top.

[0028] In this manner, in this embodiment, the cooling water inlet case 50 is connected to the water pump 40, so that it is possible to freely set the positions and postures of the multiple cooling water pipes connected to the cooling water inlet case 50. Here, the first cooling water inlet case 51 and the second cooling water inlet case 52 are connected by fastening bolts 13 (see FIG. 7) from the rear.

[0029] In Figures 4 and 5, of the multiple cover mounting boss portions 25, the first cover mounting boss portion 26A and the second cover mounting boss portion 26B, the first cover mounting boss portion 26A is located below the water pump 40 (see Figure 2), and the second cover mounting boss portion 26B is located above the water pump 40.

[0030] The extension portion 27 has a first case mounting boss 28A to which a lower portion 50A (see FIG. 2) of the coolant inlet case 50 is fastened with bolts 11, and a second case mounting boss 28B to which an upper portion 50B (see FIG. 2) of the coolant inlet case 50 is fastened with bolts 11. The extension portion 27 also has a first flange 29A extending from the coolant inlet 30 to the side of the first cover mounting boss 26A, and a second flange 29B extending from the coolant inlet 30 to the side of the second cover mounting boss 26B. That is, the first flange 29A extends downward from the coolant inlet 30 toward a position (laterally) near the left side of the first cover mounting boss 26A. The second flange 29B extends upward from the coolant inlet 30 toward a position (laterally) near the left side of the second cover mounting boss 26B.

[0031] First case mounting boss 28A is located at the leading end (lower end) of first flange 29A in the extension direction, and is connected to first cover mounting boss 26A. Second case mounting boss 28B is located at the leading end (upper end) of second flange 29B in the extension direction, and is connected to second cover mounting boss 26B.

[0032] The first case mounting boss 28A and the first cover mounting boss 26A are formed so that they have the same dimension in the thickness direction of the chain case 20 from the joining surface 20B of the joint 20A. Similarly, the second case mounting boss 28B and the second cover mounting boss 26B are formed so that they have the same dimension in the thickness direction of the chain case 20 from the joining surface 20B of the joint 20A. In this embodiment, the dimension in the thickness direction refers to the dimension in the front-to-rear direction.

[0033] Furthermore, in this embodiment, first flange portion 29A is also formed so that its dimension in the thickness direction of chain case 20 from joining surface 20B (see FIG. 2) of joining portion 20A is the same as that of first case mounting boss portion 28A and first cover mounting boss portion 26A. Similarly, second flange portion 29B is also formed so that its dimension in the thickness direction of chain case 20 from joining surface 20B of joining portion 20A is the same as that of second case mounting boss portion 28B and second cover mounting boss portion 26B.

[0034] Here, first case mounting boss 28A and second case mounting boss 28B have a sufficient dimension in the thickness direction to ensure the fastening strength of chain case 20 to engine body 1A. Therefore, first cover mounting boss 26A and second cover mounting boss 26B, which have the same dimension in the thickness direction as first case mounting boss 28A and second case mounting boss 28B, can also have a sufficient dimension in the thickness direction to ensure the fastening strength with coolant inlet case 50.

[0035] The ends of the first case mounting boss portion 28A, the second case mounting boss portion 28B, the first cover mounting boss portion 26A, the second cover mounting boss portion 26B, the first flange portion 29A and the second flange portion 29B are arranged on the same plane on the outer surface (front side) of the chain case 20.

[0036] In other words, the first case mounting boss portion 28A, the second case mounting boss portion 28B, the first cover mounting boss portion 26A, the second cover mounting boss portion 26B, the first flange portion 29A and the second flange portion 29B in the extension portion 27 have the same dimensions in the thickness direction, and each of these portions on the outer surface side of the chain case 20 forms the same plane.

[0037] By doing this, the thickness of the first flange portion 29A and the second flange portion 29B can be increased, and the first flange portion 29A can firmly connect the first cover mounting boss portion 26A and the first case mounting boss portion 28A, and the second flange portion 29B can firmly connect the second cover mounting boss portion 26B and the second case mounting boss portion 28B.

[0038] The inner surfaces of first flange portion 29A and second flange portion 29B may be partially hollowed out to reduce the wall thickness. In this case, the cross sections of first flange portion 29A and second flange portion 29B are U-shaped, which improves rigidity. Therefore, first cover mounting boss 26A and second cover mounting boss 26B can be firmly connected to first case mounting boss 28A and second case mounting boss 28B, just as in the case where no hollowing is performed.

[0039] Furthermore, because the ends of first flange portion 29A and second flange portion 29B are disposed on the same plane on the outer surface of chain case 20, first flange portion 29A and second flange portion 29B can be made thick overall. As a result, extension portion 27 is firmly connected to first cover mounting boss 26A and first case mounting boss 28A by first flange portion 29A, and is firmly connected to second cover mounting boss 26B and second case mounting boss 28B by second flange portion 29B. This improves the connection rigidity of coolant inlet case 50 to chain case 20, and suppresses vibration of chain case 20 and coolant inlet case 50.

[0040] 2 and 3, water pump 40 has a cylindrical water pump case 42 formed integrally with chain case 20, and a water pump cover 43 fastened to water pump case 42 with bolts 12. As shown in Fig. 4, water pump 40 has a cooling water inlet 30, a water pump chamber 31, a cooling water discharge passage 32, and a cooling water discharge port 33 formed integrally with chain case 20. In water pump 40, cooling water introduced into cooling water inlet 30 is discharged into cooling water discharge passage 32 by an impeller (not shown) provided in water pump chamber 31, and is supplied into the interior of cylinder block 2 from cooling water discharge port 33.

[0041] 3 and 4, a plurality of water pump cover mounting bosses 42A to 42G (see FIG. 4) are provided on the outer periphery of water pump case 42. Bolts 12 (see FIG. 3) for mounting water pump cover 43 are inserted into water pump cover mounting bosses 42A to 42G.

[0042] The multiple water pump cover mounting boss portions 42A to 42G have a first water pump cover mounting boss portion 42A that is connected to the outer portion of the first flange portion 29A, and a second water pump cover mounting boss portion 42B that is connected to the outer portion of the second flange portion 29B.

[0043] In Figure 3, a tubular fluid passage 23 with a circular cross section is provided on one side (front side) of the flat portion 22 of the chain case 20. The fluid passage 23 has a flow path (not shown) inside, and supplies oil discharged from the oil pump 6 (see Figure 5) to the variable valve timing mechanism inside the bulge 21. In this embodiment, the fluid passage 23 is also provided on the rear side of the flat portion 22 of the chain case 20, as shown in Figure 4. In other words, the fluid passage 23 is formed so as to protrude from both the outside (front side) and inside (rear side) of the flat portion 22 of the chain case 20.

[0044] 3 and 4, fluid passage section 23 is made up of first fluid passage section 23A extending obliquely upward from below water pump 40, and second fluid passage section 23B bending from the upper end of first fluid passage section 23A and extending above water pump 40. First case mounting boss section 28A is disposed near first fluid passage section 23A. Second case mounting boss section 28B is disposed near second fluid passage section 23B.

[0045] In this embodiment, a thick, highly rigid boss portion 23D is provided at the left end of first fluid passage portion 23A. A thick, highly rigid boss portion 23C is provided at the left end of second fluid passage portion 23B. The internal flow paths of first fluid passage portion 23A and second fluid passage portion 23B are formed by cutting from the sides of boss portions 23C and 23D, respectively, and then closed by sealing boss portions 23C and 23D with sealing plugs (not shown).

[0046] In this way, the first case mounting boss portion 28A is positioned near the boss portion 23D of the first fluid passage portion 23A, and the second case mounting boss portion 28B is positioned near the boss portion 23C of the second fluid passage portion 23B.

[0047] As described above, in this embodiment, of the multiple cover mounting boss portions 25, the first cover mounting boss portion 26A and the second cover mounting boss portion 26B, the first cover mounting boss portion 26A is positioned below the water pump 40, and the second cover mounting boss portion 26B is positioned above the water pump 40.

[0048] In addition, the extension portion 27 has a first case mounting boss portion 28A to which the lower portion 50A of the cooling water inlet case 50 is fastened by bolts 11, a second case mounting boss portion 28B to which the upper portion 50B of the cooling water inlet case 50 is fastened by bolts 11, a first flange portion 29A extending from the cooling water inlet 30 to the side of the first cover mounting boss portion 26A, and a second flange portion 29B extending from the cooling water inlet 30 to the side of the second cover mounting boss portion 26B.

[0049] The first case mounting boss portion 28A is located at the tip of the first flange portion 29A in the extension direction and is connected to the first cover mounting boss portion 26A, and the second case mounting boss portion 28B is located at the tip of the second flange portion 29B in the extension direction and is connected to the second cover mounting boss portion 26B.

[0050] As a result, first case mounting boss 28A and second case mounting boss 28B are firmly connected to the outside of first cover mounting boss 26A and the outside of second cover mounting boss 26B, and first case mounting boss 28A and second case mounting boss 28B are firmly connected to water pump 40 by first flange 29A and second flange 29B. Therefore, compared to when first case mounting boss 28A and second case mounting boss 28B are positioned near coolant inlet passage 51C in coolant inlet case 50 to improve the sealing performance of the coolant and are positioned away from first cover mounting boss 26A and second cover mounting boss 26B, the connection rigidity of coolant inlet case 50 to chain case 20 can be improved and vibration of chain case 20 and coolant inlet case 50 can be reduced.

[0051] In this embodiment, first case mounting boss 28A and first cover mounting boss 26A are formed so that they have the same dimension in the thickness direction of chain case 20 from joint surface 20B of joint 20A, and second case mounting boss 28B and second cover mounting boss 26B are formed so that they have the same dimension in the thickness direction of chain case 20 from joint surface 20B of joint 20A. The ends of first case mounting boss 28A, second case mounting boss 28B, first cover mounting boss 26A, second cover mounting boss 26B, first flange 29A, and second flange 29B are arranged on the same plane on the outer surface of chain case 20.

[0052] This allows the thickness dimension of first cover mounting boss 26A to be the same as that of first case mounting boss 28A, which has a thickness dimension sufficient for fastening chain case 20 to engine body 1A. This improves the fastening strength of coolant inlet case 50 to first cover mounting boss 26A of chain case 20. Furthermore, the thickness dimension of second cover mounting boss 26B can be the same as that of second case mounting boss 28B, which has a thickness dimension sufficient for fastening chain case 20 to engine body 1A. This improves the fastening strength of coolant inlet case 50 to second cover mounting boss 26B of chain case 20.

[0053] Furthermore, because the ends of first flange portion 29A and second flange portion 29B are disposed on the same plane on the outer surface of chain case 20, first flange portion 29A and second flange portion 29B can be made thick overall. As a result, extension portion 27 is firmly connected to first cover mounting boss 26A and first case mounting boss 28A by first flange portion 29A, and is firmly connected to second cover mounting boss 26B and second case mounting boss 28B by second flange portion 29B. This improves the connection rigidity of coolant inlet case 50 to chain case 20, and suppresses vibration of chain case 20 and coolant inlet case 50.

[0054] In this embodiment, water pump 40 includes a cylindrical water pump case 42 that is integrally formed with chain case 20, and a water pump cover 43 that is fastened to water pump case 42 with bolts 12. The outer periphery of water pump case 42 is provided with a plurality of water pump cover mounting bosses 42A-42G into which bolts 12 are inserted for attaching water pump cover 43. The plurality of water pump cover mounting bosses 42A-42G includes a first water pump cover mounting boss 42A that is connected to the outer side of first flange 29A, and a second water pump cover mounting boss 42B that is connected to the outer side of second flange 29B.

[0055] As a result, first flange portion 29A and second flange portion 29B are supported by cylindrical, highly rigid first water pump cover mounting boss portion 42A and second water pump cover mounting boss portion 42B, thereby improving the rigidity of first flange portion 29A and second flange portion 29B and reducing vibration of chain case 20 and coolant inlet case 50.

[0056] In this embodiment, a tubular fluid passage portion 23 is provided on one side of the chain case 20, and the fluid passage portion 23 is made up of a first fluid passage portion 23A that extends diagonally upward from below the water pump 40, and a second fluid passage portion 23B that bends from the upper end of the first fluid passage portion 23 and extends above the water pump 40. First case mounting boss portion 28A is located near first fluid passage portion 23A, and second case mounting boss portion 28B is located near second fluid passage portion 23B.

[0057] As a result, the first case mounting boss portion 28A and the second case mounting boss portion 28B are positioned near the first fluid passage portion 23A and the second fluid passage portion 23B, which are tubular and highly rigid, respectively, thereby improving the connection rigidity of the first case mounting boss portion 28A and the second case mounting boss portion 28B to the chain case 20 and reducing vibration of the chain case 20 and the coolant inlet case 50.

[0058] While an embodiment of the present invention has been disclosed, it will be apparent to one skilled in the art that modifications may be made thereto without departing from the scope of the present invention, and it is intended that all such modifications and equivalents be included in the following claims. [Explanation of symbols]

[0059] 1...engine, 1A...engine body, 10, 11, 12...bolt, 20...chain case (cover member), 20A...joint, 20B...joint surface, 23...fluid passage, 23A...first fluid passage, 23B...second fluid passage, 25...cover mounting boss, 26A...(first) cover mounting boss, 26B...(second) cover mounting boss, 27...extension, 28A. ..First case mounting boss portion, 28B...Second case mounting boss portion, 29A...First flange portion, 29B...Second flange portion, 30...Cooling water inlet port, 40...Water pump, 42...Water pump case, 42A...First water pump cover mounting boss portion, 42B...Second water pump cover mounting boss portion, 43...Water pump cover, 50...Cooling water inlet case, 50A...Lower portion, 50B...Upper portion, 51C...Cooling water inlet passage

Claims

1. a cover member having a joint portion joined to an end portion of the engine body, a plurality of cover mounting boss portions arranged along the joint portion and fastened to the end portion of the engine body with bolts, and an extension portion formed to extend outward beyond the joint portion and not joined to the end portion of the engine body; a water pump disposed in the extension portion; a cooling water inlet case having a cooling water inlet passage for introducing cooling water into a cooling water inlet of the water pump, the cooling water inlet case being fastened by bolts to a side surface of the expansion portion on the engine body side, The plurality of cover mounting boss portions are a first cover mounting boss portion disposed below the water pump; a second cover mounting boss portion disposed above the water pump, The extension portion is a first case mounting boss portion to which a lower portion of the cooling water inlet case is fastened by a bolt; a second case mounting boss portion to which an upper portion of the cooling water inlet case is fastened by a bolt; a first flange portion extending from the cooling water inlet port to a side of the first cover mounting boss portion; a second flange portion extending from the cooling water inlet port to a side of the second cover mounting boss portion, the first case mounting boss portion is disposed at a tip end of the first flange portion in an extension direction and is connected to the first cover mounting boss portion, The engine cooling device, characterized in that the second case mounting boss portion is arranged at the tip end of the second flange portion in the extension direction and is connected to the second cover mounting boss portion.

2. the first case mounting boss portion and the first cover mounting boss portion are formed to have the same dimension in the thickness direction of the cover member from the joint surface of the joint portion, the second case mounting boss portion and the second cover mounting boss portion are formed to have the same dimension in the thickness direction of the cover member from the joint surface of the joint portion, 2. The engine cooling device according to claim 1, wherein the ends of the first case mounting boss portion, the second case mounting boss portion, the first cover mounting boss portion, the second cover mounting boss portion, the first flange portion, and the second flange portion are arranged on the same plane on the outer surface side of the cover member.

3. The water pump is a cylindrical water pump case integrally formed with the cover member; a water pump cover fastened to the water pump case by bolts, a plurality of water pump cover mounting bosses into which bolts for mounting the water pump cover are inserted are provided on an outer periphery of the water pump case; The plurality of water pump cover mounting boss portions include: a first water pump cover mounting boss portion connected to an outer side of the first flange portion; 3. The engine cooling device according to claim 1, further comprising: a second water pump cover mounting boss portion connected to an outer side of the second flange portion.

4. a tubular fluid passage portion is provided on one side surface of the cover member; the fluid passage portion includes a first fluid passage portion extending obliquely upward from a lower side of the water pump, and a second fluid passage portion bending from an upper end of the first fluid passage portion and extending above the water pump, the first case mounting boss portion is disposed near the first fluid passage portion, 4. The engine cooling device according to claim 1, wherein the second case mounting boss portion is disposed in the vicinity of the second fluid passage portion.

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