JPH0281920A - Cooling device for multicylinder engine - Google Patents

Abstract

PURPOSE:To enable the uniform and efficient cooling of a radial flange part heated by the high temperature of a cylinder liner by communicating a block side coolant jacket with a flange surrounding coolant gallery by a plurality of distributing passages. CONSTITUTION:A block side coolant jacket JB is provided on a cylinder block 1 so as to surround the body part outer circumference of a cylinder liner 5. The flange surrounding coolant gallery 16 is provided in the cylinder block 1 so as to surround the outer circumference of the radial flange part 5a of the cylinder liner 5. The block side coolant jacket JB is communicated with the flange surrounding coolant gallery 16 by a plurality of distributing passages 15. Hence, the coolant run into a plurality of coolant passages 6 of the block side coolant jacket JB is passed along the cylinder axial line, and then run into the lower stream side coolant gallery 13, during which the coolant cools the body part outer side of the cylinder liner 5. The coolant is then sent to the flange surrounding coolant gallery 16.

Description

DETAILED DESCRIPTION OF THE INVENTION A1 Object of the Invention (1) Industrial Application Field The present invention relates to a cooling device using a refrigerant for a multi-cylinder engine in which cylinder liners are inserted into a plurality of cylinders of a cylinder block.

(2) Prior Art A cooling device using a refrigerant such as water for a conventional multi-cylinder engine is disclosed in, for example, Japanese Utility Model Application Publication No. 61-57124.

(3) Problems to be Solved by the Invention However, in a multi-cylinder engine in which a cylinder liner having an outward flange at the upper end is inserted into a plurality of cylinders, the flange portion of the cylinder liner, which is heated to a relatively high temperature, is evenly distributed. It is difficult to cool the cylinders efficiently, especially in engines where the spacing between cylinders is narrowed in order to reduce the size of the engine. Therefore, it was not possible to directly cool the contact portion of the flange portion with a refrigerant.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to directly and evenly distribute a refrigerant around the outer periphery of the outward flange portion of the cylinder liner. It is an object of the present invention to provide a cooling device for a multi-cylinder engine that allows a refrigerant to flow through the cylinder liner, thereby uniformly and efficiently cooling the outward flange portion of the cylinder liner which is heated to a high temperature.

B8 Structure of the invention (1) Means for solving the problem In order to achieve the object, according to the invention described in claim 0, a plurality of cylinders arranged in a row in a cylinder block are provided with an outward flange portion at the upper end. A cooling device for a multi-cylinder engine in which cylinder liners formed with a It is characterized by comprising a block-side flange-around refrigerant gear assembly provided in the cylinder block so as to surround the outer periphery of the outward flange portion, and a plurality of distribution passages communicating between the block-side refrigerant jacket and the flange-around refrigerant gear assembly. .

According to the invention of claim 0, there is provided an engine cooling device in which cylinder liners each having an outwardly facing flange portion formed at an upper end are inserted into a plurality of cylinders arranged in a row in a cylinder block, a block-side refrigerant jacket provided on the cylinder block so as to surround the outer periphery of the body of each cylinder liner; a flange-side refrigerant gear provided on the cylinder block so as to surround the outer periphery of the outward flange portion of the cylinder liner; It consists of a plurality of distribution passages communicating between the block-side refrigerant jacket and the refrigerant gear around the flange, and the adjacent parts of the outward-facing flanges of adjacent cylinder liners are flatly chamfered and in contact with each other, with a direct line between the contact surfaces. An inter-flange refrigerant passage is formed, and the refrigerant passage communicates with the block-side refrigerant jacket.

Furthermore, according to the invention of claim 0, there is provided an engine cooling device in which cylinder liners each having an outward flange formed at the upper end are inserted into a plurality of cylinders arranged in a row in a cylinder block, a block-side refrigerant jacket provided on the cylinder block so as to surround the outer periphery of the body of each cylinder liner; and a flange-side refrigerant gear provided on the cylinder block so as to surround the outer periphery of the outward flange portion of the cylinder liner; It consists of a plurality of distribution passages communicating between the block side refrigerant jacket and the flange surrounding refrigerant gear gallery, and the adjacent portions of the outward flange portions of adjacent cylinder liners are chamfered to a flat tq so as to be in contact with each other, and the contact surfaces A straight inter-flange refrigerant passage is formed therebetween, extending in the cylinder axial direction and opening at the upper and lower surfaces of the outward flange portion, and the refrigerant passage is communicated with the block-side refrigerant jacket.

Furthermore, according to the invention of claim 0, there is provided an engine cooling device in which a plurality of cylinder liners arranged in a row in a cylinder block are each fitted with a cylinder liner having a flange portion formed at the upper end thereof. , a block-side refrigerant jacket provided on the cylinder block so as to surround the outer periphery of the body of each cylinder liner, and a head provided on the cylinder end of the cylinder block so as to surround a combustion chamber formed therein. A side refrigerant jacket] connects a block side flange surrounding refrigerant gear provided in the cylinder block so as to surround the outer periphery of the outward flange of the cylinder liner, and the block side refrigerant jacket and the block side flange surrounding refrigerant gear. It is characterized by comprising a plurality of distribution passages that communicate with each other, a plurality of communication passages that communicate with the refrigerant gear gallery around the block side flange, and the head side refrigerant jacket.

(2) Function A refrigerant such as cooling water flows into the main refrigerant gear gallery by driving the pump of the cooling circuit. Once the main refrigerant gear is filled with refrigerant, the cooling water increases its flow rate through multiple throttle communication passages, is evenly distributed into the upstream refrigerant gear, and from there flows through multiple channels of each wet liner. The refrigerant is distributed and supplied to the block-side refrigerant jacket formed by the refrigerant passage. The refrigerant that has flowed into the plurality of refrigerant passages in the block side refrigerant jacket flows along the cylinder axis and then flows into the downstream refrigerant gear gallery, during which time it cools the outer periphery of the body of the cylinder liner of the cylinder block. The refrigerant flowing into the downstream refrigerant gear gallery flows through a plurality of distribution passages to the block-side flange-around refrigerant gear, and from there flows through the water holes in the gasket to the head-side flange-around refrigerant gear.

During this time, high-temperature heating parts such as the outer periphery of the outward flange of the cylinder liner and the joint surface between the cylinder block and the cylinder head can be cooled evenly and efficiently. The refrigerant in the refrigerant jacket around the head-side flange portion flows through the plurality of communication holes to the head-side refrigerant jacket and cools the cylinder.

A portion of the refrigerant in the upstream refrigerant gear also flows into the straight inter-flange refrigerant passage, and from there passes through relatively large-diameter vertical passages at both ends of the refrigerant passage, directly to the head-side refrigerant jacket, and flows into the adjacent cylinder liner. It is possible to intensively cool the boundary area adjacent to the flange.

(3) Embodiment Hereinafter, a first embodiment in which the device of the present invention is implemented in an in-line four-cylinder engine will be described with reference to the drawings. Section 3.4
As shown in the figure, the engine main body E of the engine includes a cylinder block 1 and a cylinder head 2 joined to the deck surface la of the cylinder block 1 via a gasket G, as usual.

Next, the configuration of the cooling device of the present invention will be explained with reference to FIGS. 1 to 10.

Four cylinders 3 are arranged in series in the cylinder block 1, and a wet liner 5 as a hollow cylindrical cylinder liner with an outward flange 5a formed at the upper end is inserted into each cylinder 3. be done. The wet liner 5 is fitted into the cylinder block 1 by a press-fit cap, or is integrally cast when the cylinder block 1 is cast. The outward flange portion 5a is supported by the cylinder block 1 by being installed on an annular installation surface lb formed at the upper end of the cylinder block 1. A piston (not shown) is slidably fitted into the cylinder pore 4 of the wet liner 5.

As shown in Fig. 3.7.8, on the entire outer peripheral surface of the body of the wet liner 5, a large number of cooling fins 5b are arranged at intervals in the circumferential direction and parallel to each other in the direction of the cylinder axis f1Ri+-1. When the wet liner 5 is fitted into the cylinder 3, the outer surface of the multiple cooling fins 5b is closely spaced between adjacent cooling fins 5b on the inner peripheral surface of the cylinder wall 1e of the cylinder block 1. Cylinder axis 2. - A large number of straight refrigerant passages 6 parallel to one another are formed,
These block side refrigerant jackets J.

is formed. and the block side refrigerant jacket, J
The lower side of a, that is, the crankcase IC side of the cylinder block l, is the upstream side, and the deck surface la side is the downstream side. As shown in FIGS. 2 and 7, the wall 1d between the adjacent wet liners 5 and 5 is the crank axis! □
-22 is cut out in a band shape with a predetermined width on both sides, and at the cutout 7 portion, the outer circumferential surfaces of adjacent wet liners 5.5 face each other with a slight interval, The several cooling fins 5b on the opposing outer circumferential surfaces are in phase with each other, so that a common refrigerant passage 6 with a large passage cross-sectional area is common to the adjacent cylinders 3, 3. is formed. Although the adjacent portions of the adjacent wet liners 5, 5 are heated to the highest temperature, the cooling efficiency of the common refrigerant passage 61 in the core portion is increased due to its large passage cross-sectional area.

As shown in Fig. 3.4.6, a main refrigerant gear gallery 8 with a relatively large capacity is formed between the lower portions of the plural wet liners 5 and the corresponding cylinder wall le of the cylinder block 1. 8 is formed to commonly surround the outer periphery of a plurality of wet liners 5 and has a relatively large capacity. An inlet 9 is provided at one end of this main refrigerant gear gallery 8.
is formed. This inlet 9 is connected to a pump 10 that is connected to a cooling circuit (not shown).

Further, as shown in FIG. 4, immediately below the block-side refrigerant jacket J consisting of the multiple refrigerant passages, the outer periphery of each wet liner 5 is coated with the outer peripheral surface of the wet liner 5 and the cylinder of the cylinder block 1. An annular upstream refrigerant gear gallery 11 is formed by the inner peripheral surface of the wall 1e, and this upstream refrigerant gear gallery 11 is directly connected to the lower end, that is, the upstream end, of the block-side refrigerant jacket J8.

Further, as shown in FIG.
An annular partition wall 5c is integrally provided in a headband shape to partition the space, and the outer periphery of the partition wall 5C is brought into close contact with the inner surface of the cylinder wall 1e.

A plurality of throttle communication passages 12 are formed in each partition wall 5c at intervals in the circumferential direction, and the main refrigerant gear assembly 8 and the upstream refrigerant gear assembly 11 are connected to each other via these throttle communication passages 12.
are communicated. Therefore, the refrigerant such as water flowing through the main refrigerant gear gallery 8 flows through the plurality of throttle communication passages 12 to the upstream refrigerant gear gallery 11, and from there to the block refrigerant jacket J1.

Further, directly above the refrigerant jacket J, an annular downstream refrigerant gear gallery 13 is formed on the outer periphery of each wet liner 5 by the outer peripheral surface of the wet liner 5 and the inner peripheral surface of the cylinder wall 1e of the cylinder block 1. The downstream refrigerant gear 13 is directly connected to the upper end, ie, the downstream end, of the refrigerant jacket Js.

As shown in FIGS. 4 and 10, a plurality of U-shaped distribution passages 15 are formed at intervals in the circumferential direction at the upper end of the inner circumferential wall of each cylinder 3, and these distribution passages 15 ...
is directly communicated with the downstream refrigerant gear gallery 13, and its upper end is open to the upper surface of the cylinder 3. Further, as clearly shown in FIG. 1, between the outer circumferential surface of the outward flange portion 5a of the wet liner 5 and the upper end of the inner circumferential surface of the cylinder 3, the outer circumferential surface of the plurality of outward flange portions 5a is commonly surrounded. An endless block-side flange-around refrigerant gear gallery 16 is formed, and this block-side flange-around refrigerant gear gallery 16 communicates with the plurality of distribution passages 15 . . . and is opened to the deck surface 1a of the cylinder block l. Therefore, the refrigerant that has flowed into the downstream refrigerant gear gallery 13 flows into the plurality of distribution passages 15 .

As clearly shown in Fig. 1.8, the adjacent portions of the flanges 5a, 5a of the adjacent web 1-liner 5.5 are chamfered substantially flat, f, f, and the chamfers f, f are mutually adjacent to each other. A straight inter-flange refrigerant passage 17 is formed in the lower half between the contact surfaces, as shown in FIG. The lower surface of the refrigerant passage 17 is open to the downstream refrigerant gear gallery 13. Therefore, the refrigerant in the downstream refrigerant gear gallery 13 flows into the inter-flange refrigerant passage 17 as shown in FIG. 8, and from both ends thereof flows into the block-side flange-around refrigerant gear gallery 16. Furthermore, vertical passages 18 and 18 are formed at both ends of the inter-flange refrigerant passage 17 to directly communicate the downstream refrigerant gear gallery 13 and the block-side flange surrounding refrigerant gear gallery 16, and a portion of the refrigerant in the downstream refrigerant gear gallery 13 is formed therein. The refrigerant is configured to flow directly through the vertical passages 18 and 18 to the head side refrigerant jacket) J□, which will be described later.

On the other hand, as clearly shown in FIG. 9, the lower surface of the cylinder head 2, which is joined to the metal surface la of the cylinder block l via the gasket G, faces the refrigerant gear rally 16 around the block side flange via the gasket G. Cross section inverted U
A refrigerant gear gallery 20 is formed around the head-side flange in the shape of a letter, and these two refrigerant gears 16, 20 communicate with each other through a plurality of water holes 21 formed in the gasket G, as shown in FIG. The refrigerant gears 16 and 20 around the flange work together to form a collective refrigerant gear G3 around the flange, and the refrigerant in the block-side refrigerant jacket J@ is transferred to the head-side refrigerant jacket J through the gear assembly G. It flows.

As shown in FIGS. 4 and 9, the refrigerant gear 20 around the head side flange is connected to the head side refrigerant jacket I' through a number of communication holes 22 bored in the bottom wall of the cylinder head 2.
Connected to Jn. Further, on the bottom wall of the cylinder head 2, there is a tube that directly communicates with the vertical passage 18° 1B on the block side.
Head side reservoir passage 23.23 having a larger diameter than the communication hole 22
is drilled, and as shown by the arrow in FIG.
23 and directly to the head-side refrigerant jacket J14, so that the heated portion between the adjacent cylinders 3, 3 can be effectively cooled.

A plurality of distribution passages 15 on the block side as shown in FIG.
．． 15... and multiple water holes 2 drilled in the gasket G
1, 21... and a plurality of communication holes 22.2 on the head side
2... are shifted in phase from each other in the circumferential direction of the cylinder 3, and the refrigerant flowing through them detours in a staggered manner as shown by the arrow in FIG. The refrigerant is arranged to flow evenly within the collective refrigerant gear GR around the flange consisting of the surrounding refrigerant gears 16 and 20.

Note that FIG. 11 shows a modification of the portion corresponding to FIG. 1O, and in this modification, the distribution passage 15.1 on the block side is
5... and the water holes 21... of the gasket G are matched in circumferential phase.

In Figs. 4.5 and 9, ``■'' is an intake valve, ``■'' is an exhaust valve, P is a spark plug, Cc is a combustion chamber, and Bo is a connecting bolt between the cylinder block 1 and the cylinder head 2.

Next, the operation of the first embodiment of the present invention shown in FIGS. 1 to 10 will be explained.

A refrigerant such as cooling water flows into the main refrigerant gear gallery 8 by driving the pump 10 of the cooling circuit. When the main refrigerant gear 8 is filled with refrigerant, the cooling water passes through the plurality of throttle communication passages 12 to increase the flow velocity, and is evenly divided into the upstream refrigerant gear 11, and from there to each wet liner 5. The block side refrigerant J is distributed and supplied to the block side refrigerant J, which is made up of a plurality of refrigerant passages 6. The refrigerant that has flowed into the plurality of refrigerant passages 6 of the block side refrigerant jacket Jll flows along the cylinder axis 1 + 1 + and then flows into the downstream refrigerant gear gallery 13, during which time it flows through the body of the wet liner 5 of the cylinder block 1. Cool the outer periphery.

As shown in FIG. 10 or 11, the refrigerant that has flowed into the downstream refrigerant gear gallery 13 flows through a plurality of distribution passages 15 to the refrigerant gear gallery 16 around the block side flange, and from there it is connected to the gasket G. The refrigerant flows through the holes 21 to the refrigerant gear gallery 20 around the head side flange. In between, the outer periphery of the outward flange portion 5a of the wet liner 5, the cylinder block l and the cylinder head 2
It is possible to uniformly and efficiently cool high-temperature heating parts such as the joint surface with the Then, the refrigerant in the refrigerant jacket 20 around the head side flange portion flows to the head side refrigerant jacket JII through the plurality of communication holes 22 .
to cool down.

In addition, a part of the refrigerant in the upstream refrigerant gear gallery 1 flows into the straight inter-flange refrigerant passage 17, and from there passes through relatively large-diameter vertical passages 18..., 23... at both ends of the straight flange refrigerant passage 17 directly to the head side. The refrigerant flows into the jacket J and the flange portions 5a of the adjacent wet liners 5,5.

It is possible to intensively cool the adjacent boundary portion 5a.

A second embodiment of the device of the present invention is shown in FIGS. 12-14. In this embodiment, the same members as in the first embodiment are given the same reference numerals. In this second embodiment, a plurality of cooling fins 30 along the cylinder axis 1+1+ direction are provided in the lower half of the chamfer 1 of the flange portion 5a of the wet liner 5, and these cooling fins 30... - A plurality of refrigerant short passages 31 are formed between them, and the downstream refrigerant gear gallery 13 is communicated with the inter-flange refrigerant passage 17 via these short passages 31. Therefore, the refrigerant in the downstream refrigerant gear 13 flows into the inter-flange refrigerant passage 17 through the short passages 31 between the plurality of cooling fins 30, as shown by the arrows in FIG. The adjacent portions of the flange portions 5a, 5a of the wet liners 5, 5 can be efficiently cooled.

FIG. 15 shows a third embodiment of the invention.

In this third embodiment, the same members as in the first embodiment are given the same reference numerals. In this third embodiment, as shown in FIG. 15, a plurality of cooling fins are provided along the cylinder axis 1+1+ direction on one flat chamfered portion of the outward flange portions 5a of adjacent cylinder liners 5 that contact each other. 32 .
... are opened on the upper and lower surfaces of the outward flange 5a and communicate with the downstream refrigerant gear gallery 13 and the head refrigerant jacket J. Therefore, the refrigerant in the downstream refrigerant gear gallery 13 flows through the plurality of refrigerant passages 33 .
The adjacent portions of the flange portions 5a, 5a of No. 5 can be efficiently cooled.

In addition, the above 1. Although the second embodiment describes the case where the present invention is applied to a closed-cylinder engine, it is of course possible to apply the present invention to other types of multi-cylinder engines. You may.

Effects of the C6 Invention As described above, according to the invention of claim 0, the outward flange portion at the upper end of the cylinder liner inserted into the cylinder of a multi-cylinder engine can be cooled uniformly and efficiently.

According to the invention of claim 1, in order to shorten the length in the cylinder arrangement direction of a multi-cylinder engine, adjacent portions of outward flanges of cylinder liners of adjacent cylinders are chamfered, and the chamfered portions are chamfered. Even though they are in contact with each other, the contact surfaces can be directly cooled by the refrigerant, and the outward flange of the cylinder liner can be cooled evenly over its entire circumference. The difference in temperature distribution can be significantly reduced.

Furthermore, according to the invention of claim 0, the cooling effect between the contact surfaces is further enhanced by allowing the refrigerant to flow directly between the contact surfaces of the outward flanges of adjacent cylinder liners.

Furthermore, according to the invention of claim 0, in a multi-cylinder engine in which cylinder liners each having an outward flange portion at the upper end are inserted into a plurality of cylinders, the cylinder block and cylinder liner at the outer peripheral portion of the outward flange portion are inserted into a plurality of cylinders. - Coolant can be distributed evenly between the joint surfaces that are heated to high temperatures to efficiently cool the joint surfaces.

[Brief explanation of the drawing]

Figures 1 to 1O show a first embodiment of the present invention, in which Figure 1 is a plan view of a cylinder block with a cylinder liner inserted into the cylinder, taken along the line 1-1 in Figure 4, and Figure 2 is a plan view of the cylinder block with the cylinder liner removed from the cylinder, FIG. 3 is a vertical cross-sectional view of the cylinder block taken along line 1-III in FIG. 1, and FIG. 4 is taken along line IV-IV in FIG. 3. FIG. 5 is a vertical cross-sectional view of the cylinder block and cylinder head, and FIG.
7th cross-sectional view of the cylinder block along the l-Vl line
The figures are a cross-sectional view taken along the line ■-■ in Figure 3, a perspective view of a portion of the cylinder block in Figure 8, a partial bottom view of the cylinder head taken along the line Figure 1O is Figure 4X-
FIG. 3 is a partial vertical sectional view of the cylinder block and cylinder head taken along an X-ray. FIG. 11 shows a modification of the first embodiment, and is the same partial vertical sectional view as FIG. 10, and FIGS. 12 to 14 show a second embodiment of the present invention, and FIG. FIG. 13 is a plan view of a part of the cylinder block in which the
Figure 2 is a vertical cross-sectional view of the cylinder block and cylinder head taken along the line FIG. Cc...Combustion chamber, Gll...Collective refrigerant gear gallery around the flange, J,...Block side refrigerant jacket, Jl
+...Head side refrigerant jacket, 1. -x,...Crank axis, ■...Cylinder block, 3...Cylinder, 5...
・Wet liner as cylinder liner, 5a...
Outward flange portion, 15...U-shaped distribution passage, 1G.
... Refrigerant gear rally around block side flange, 17...
Refrigerant passage for flange, 18...Vertical passage, 21...Water hole, 22...Communication rL, 3I...Refrigerant short passage Fig. 8

Claims (1)

[Claims] [1] Cylinder liners (5) each having an outward flange (5a) formed at its upper end are inserted into a plurality of cylinders (3) arranged in a row in a cylinder block (1). This cooling device for a multi-cylinder engine includes a cylinder block (5) surrounding the outer circumference of the body of each cylinder liner (5).
1) Block side refrigerant jacket (J_B) provided in
and the outward flange portion (5) of the cylinder liner (5).
The refrigerant gallery (16) around the block side flange provided in the cylinder block (1) so as to surround the outer periphery of
), and a plurality of distribution passages (15) communicating the block-side refrigerant jacket (J_B) and the flange-around refrigerant gallery (16). [2] An engine cooling system in which cylinder liners (5) each having an outward flange (5a) formed at the upper end are inserted into a plurality of cylinders (3) arranged in a row in a cylinder block (1). There, each cylinder liner (5)
A block-side refrigerant jacket (J_B) provided on the cylinder block (1) so as to surround the outer periphery of the body of the cylinder block ( 1), and a plurality of distribution passages (15) communicating between the block-side refrigerant jacket (J_B) and the flange-around refrigerant gallery (16), and adjacent cylinder liners. Adjacent parts of the outward flange parts (5a) of (5) are flatly chamfered and in contact with each other, and a straight inter-flange refrigerant passage (17) is formed between the contact surfaces.
) is formed, and the refrigerant passage (17) is communicated with the block side refrigerant jacket (J_B). [3] Both open ends of the inter-flange refrigerant passage (17) are communicated with the flange-surrounding refrigerant gallery (16), and the refrigerant from the block-side refrigerant jacket (J_B) passes through the inter-flange refrigerant passage (17) to the block. The cooling device for a multi-cylinder engine according to item [2], in which the coolant is guided to the coolant gallery (16) around the side flange. [4] The block side refrigerant jacket (J_B) and the block side flange surrounding refrigerant gallery (16) are directly connected to each other via vertical passages (18) provided at both ends of the inter-flange refrigerant passage (17). [3] The cooling device for a multi-cylinder engine according to item [3]. [5] The straight inter-flange refrigerant passage (17) extends in a direction substantially perpendicular to the engine crank axis (l_2-l_2) and connects to the block-side flange surrounding refrigerant gallery (
16) The cooling device for a multi-cylinder engine according to item [3], which communicates with the cooling device. [6] Below the straight interflange refrigerant passage (17),
A plurality of short passages (31) are formed along the cylinder axis (l_1-l_1) of the engine, and these short passages (31)
The cooling device for a multi-cylinder engine according to item [3], wherein the block-side refrigerant jacket (J_B) and the flange-around refrigerant gallery (16) communicate with each other via. [7] An engine cooling device in which cylinder liners (5) each having an outward flange (5a) formed at the upper end are inserted into a plurality of cylinders (3) arranged in a row in a cylinder block (1). There, each cylinder liner (5)
A block-side refrigerant jacket (J_B) provided on the cylinder block (1) so as to surround the outer periphery of the body of the cylinder block ( 1), and a plurality of distribution passages (15) communicating between the block-side refrigerant jacket (J_B) and the flange-around refrigerant gallery (16), and adjacent cylinder liners. Adjacent parts of the outward flange part (5a) of (5) are flat chamfered and in contact with each other, and between the contact surfaces there is a straight line extending in the cylinder axis direction and opening at the upper and lower surfaces of the outward flange part (5a). A cooling device for a multi-cylinder engine, characterized in that an inter-flange refrigerant passage (33) is formed, and the refrigerant passage (33) communicates with the block side refrigerant jacket (J_B). [8] An engine cooling device in which cylinder liners (5) each having an outward flange (5a) formed at the upper end are inserted into a plurality of cylinders (3) arranged in a row in a cylinder block (1). There, each cylinder liner (5)
A block-side refrigerant jacket (J_B) is provided on the cylinder block (1) so as to surround the outer periphery of the body of the cylinder head (2) on the cylinder block, and a combustion chamber (Cc) is provided on the cylinder head (2) on the cylinder block to surround the combustion chamber (Cc) formed therein. a head-side refrigerant jacket (J_H) provided to 16), and a plurality of distribution passages (
15) and the refrigerant gallery around the block side flange (
16) and a plurality of communication passages (22) communicating with the head side refrigerant jacket (J_H). [9] The block-side flange-around refrigerant gear gallery (16) and the head-side flange-around refrigerant gear gallery (20) are superimposed and communicated with each other to form a flange-around collective refrigerant gallery (G_R);
The cooling device for a multi-cylinder engine according to item [8]. [10] Refrigerant gallery around the block side flange (1
6) and the refrigerant gallery (20) around the head side flange are a plurality of water holes (21) bored in a gasket (G) interposed between the cylinder block (1) and the cylinder head (2).
) The cooling device for a multi-cylinder engine according to item [9], which communicates with each other via the cooling device. [11] The water hole (21) and the communication hole (22) are located in the [1st
0] A cooling device for a multi-cylinder engine according to item 0. [12] Flange portions of adjacent cylinder liners (5) (
5a), the block-side refrigerant jacket (J_B) and the head-side refrigerant jacket (J_H) are directly connected to each other through the water hole (21) of the gasket (G). Engine cooling system. [13] The cylinder liner (5) is a wet liner in which a block-side refrigerant jacket (J_B) is directly formed on the outer periphery of the cylinder liner (5).
4], [5], [6], [7], [8], [9], [1
0], [11] or [12].