JPH0932629A - Cooling device of siamese cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the wall thickness of a continuous wall part of a Siamese cylinder to the utmost limits so as to reduce the size and weight of the cylinder by disposing non-cavity parts and wedge-like cooling water passages alternately formed in multi- stage vertically between right and left jacket communicating passages and between right and left cooling water introducing parts of a water passage forming member. SOLUTION: A water passage forming member 10 is casted in a part 4a a little to the head of a continuous wall part 4 of a Siamese cylinder, and cooling water in a cylinder jacket 8 is passed and circulated through a pair of right and left cooling water introducing parts 13, a cooling water passage 15, and a jacket communicating path 12 formed on the water passage forming member 10 to cool the cylinder. The water passage forming member 10 is so constructed that non-cavity parts 11 and wedge-like cooling water passages 15 are alternately formed in multi-stage vertically between a pair of right and left jacket communicating passages 12 positioned on the upper half part, and a pair of right and left cooling water introducing parts 13 positioned on the lower part thereof are formed in such a manner that a pair of front and rear cooling water guide plates 14 projected on the right and left sides are expanded along the outer peripheral surfaces 3b of the front and rear adjacent cylinders.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system for a Siamese cylinder of a multi-cylinder engine, which strongly cools a head portion of a continuous wall portion of the cylinder to relatively reduce the size and weight of the multi-cylinder engine and increase the output. Provide what can be achieved.

[0002]

2. Description of the Related Art In recent years, it has been necessary to reduce the size and weight of a multi-cylinder engine so that the intervals between the cylinder bores are narrowed, or to increase the displacement to increase the engine output. Siamese cylinders with thinner meat walls have been adopted. As a conventional technique of this type, for example, Japanese Utility Model Publication No. 1-38278.
The one disclosed in Japanese Patent Application Laid-Open Publication No. H10-260, 1993 is known.

FIG. 5 shows the above-mentioned conventional example, FIG. 5 (A) is a longitudinal sectional view of an essential part of a siamese cylinder, and FIG. 5 (B) is a cross-sectional plan view taken along the line BB in FIG. 5 (A). FIG. 5 (C) is a perspective view of the water channel forming member that is cast into the continuous wall portion of the Siamese cylinder. In this conventional example, a plurality of cylinders 3 are arranged side by side in a front and rear direction in a cylinder block 1, and adjacent cylinders 3 and 3 are connected by a continuous wall portion 4 to form a siamese cylinder 2 so that the siamese cylinder 2 is surrounded. A cylinder jacket 8 is formed on the continuous wall portion 4
The water channel forming member 110 is cast into the.

This water channel forming member 110 is shown in FIGS.
As shown in (C), a pair of left and right jacket communication paths 112
112, a pair of left and right cooling water inlets 113, 113 located below each jacket communication passage 112, 112 and opening toward each cylinder jacket 8, 8 and each jacket communication passage 112 and cooling water introduction A pair of left and right cooling water channels 115 communicating with the mouth 113 are provided.
Is formed in a flat shape in a front view, in a longitudinal shape in a vertical cross-section, and in a bag shape. The cooling water in the cylinder jacket 8 is
The cooling water introduction port 113, the cooling water passage 115, and the jacket communication passage 112 are sequentially discharged to the head jacket,
In the meantime, the head portion 4a of the continuous wall portion 4 is configured to be cooled.

The water channel forming member 110 is formed by molding two metal plate-shaped members 110a and 110a, and laterally H-shaped non-cavity portions 111 and 111 are fixed to each other. , Left and right jacket communication passage 112.1.
The joint portion 117 formed on the outer side of 12 is merely superposed and not fixed. Further, the front and rear two metal plate-shaped members 110a and 110a are not symmetrical because the joint portion 117 is different.

[0006]

In the above-mentioned conventional example, since the cooling water passage 115 is flat and vertically long, in machining the cylinder bore 3a, insufficient strength occurs at the corresponding portion of the cooling water passage 115, and eventually the local portion of the cylinder bore 3a. Distortion may occur. In order to avoid this, it is necessary to increase the thickness of the continuous wall portion 4 to some extent. That is, since the wall thickness of the continuous wall portion 4 cannot be made sufficiently thin, there is a problem in narrowing the interval between the cylinder bores 3a or increasing the displacement to increase the output of the engine.

Further, in the above-mentioned conventional example, the cooling water introducing port 113 is formed by notching the lower portion of the cylindrical body forming each jacket communication passage 112, but the cooling water introducing port 113 is formed.
Since the frontage is small, a large amount of cooling water cannot be smoothly introduced into the cooling water passage 115. That is, there is a drawback that the head-side portion 4a of the continuous wall portion 4 cannot be cooled strongly. As described above, if the head-side portion 4a of the continuous wall portion 4 cannot be strongly cooled and the heat radiation ability is low, it is impossible to increase the output of the engine from the viewpoint of suppressing the heat load.

That is, although the piston ring is cooled through the cylinder wall, if the heat radiating ability of the head-side portion 4a is low, the top ring is particularly fixed from the top surface of the piston from the viewpoint of preventing seizure of the piston ring. There is no choice but to install them separated by a distance. This means that a ring-shaped dead space that does not contribute to combustion occurs on the outer circumference of the piston top. For this reason, it is not possible to improve the air utilization rate, which in turn cannot increase the output of the engine.

Particularly in recent years, it has been demanded to further reduce the size and weight of the engine and to increase the output of the engine. However, the conventional example has the above-mentioned drawbacks, so that these requirements cannot be sufficiently satisfied. The present invention has been made in view of such circumstances, and by further reducing the wall thickness of the continuous wall portion to the utmost, further downsizing and weight saving of a multi-cylinder engine and improvement of engine output, It is a technical subject to improve the air utilization rate and the engine output by cooling the portion of the meat wall near the head more strongly and positioning the top ring higher.

[0010]

In order to solve the above problems, the present invention is configured as follows. That is, claim 1
In the invention described in (1), the water channel forming member 10 is cast into the head-side portion 4a of the continuous wall portion 4 of the Siamese cylinder 2 to cool the cooling water in the cylinder jackets 8 and 8 into a pair of left and right channels. Cooling of a Siamese cylinder configured so as to flow out to the head jacket 22 located above the continuous meat wall portion 4 through the cooling water introduction portion 13/13, the cooling water passage 15/15, and the jacket communication passage 12/12 in order. In the device, the water channel forming member 10
Is a pair of left and right jacket communication passages 12 located in the upper half.
12 and a pair of left and right cooling water introducing portions 13 and 13 positioned below the jacket communication passages 12 and 12 and opening toward the cylinder jackets 8 and 8 and the left and right jacket communication passages 12 and 12. Between and left and right cooling water inlets 13.1
3 is provided with non-cavity portions 11 and wedge-shaped cooling water channels 15 that are alternately formed in upper and lower stages, and each wedge-shaped cooling water channel 15 has a wedge-shaped cavity portion 15a in plan view. The left and right cooling water introducing parts 13, 13 are symmetrically arranged so that their tips are directed to the center, and the pair of front and rear cooling water guide plates 14, 14 projecting left and right are provided in front and rear adjacent cylinders, respectively. It is characterized in that it is configured by expanding along the respective outer peripheral surfaces 3b and 3b of 3.3.

According to a second aspect of the present invention, in the cooling device for the Siamese cylinder according to the first aspect, at least the upper edge 15b of each of the pair of left and right cooling water passages 15 is formed to have an upward slope in the left-right direction. It is a thing. Here, "at least" requires that the upper edge 15b of each of the pair of left and right cooling water passages 15 is formed to have an upward slope in the left-right direction, but the lower edge 15c of each cooling water passage 15 is formed in the left-right direction. It means that it does not matter whether or not it forms an upward gradient to the outside.

According to a third aspect of the present invention, in the cooling device for the Siamese cylinder according to the first or second aspect, the water channel forming member 10 is formed by molding two metal plate-shaped bodies 10a and 10a. The non-hollow portions 11 and 11 are formed symmetrically in the front-rear direction and are formed in a multi-tiered manner, and the outer edge joint portions 17 and 17 that are formed by projecting vertically outward on the outer edges of the left and right jacket communication passages 12 and 12. It is configured by being fixed to each other.

According to a fourth aspect of the present invention, in the cooling device for the Siamese cylinder according to the third aspect, the left and right side portions of the head leaning portion 4a of the continuous wall portion 4 are a pair of left and right cylinder head fastening boss portions. The outer edge joint 17 is formed between the cylinder 3 and the cylinder head fastening boss portion 5, and the other outer edge joint 17 is formed between the other cylinder 3 and the cylinder head. Between the fastening boss portion 5 and one of the cylinders 3 on the one side and the other side, respectively, they are offset and cast.

[0014]

In the invention described in claim 1, the non-hollow portion 11 formed in the upper and lower multi-stages of the water channel forming member 10 functions as a rib that mechanically reinforces the continuous wall portion 4. That is, the non-hollow part 1
The cooling water passages 15 formed alternately in the upper and lower multi-stages are markedly increased in mechanical strength as compared with the flat and vertically long cooling water passages 115 of the conventional example. As a result, there is no possibility that partial distortion will occur in the drilling of the cylinder bore 3a.

The wall thickness of the continuous wall portion 4 is thinnest in the central portion and thickest in both left and right end portions, but in the invention according to claim 1, it corresponds to the wall thickness of the continuous wall portion 4. Since the cooling water channel 15 is formed in a wedge shape in a plan view and is symmetrically configured so that its tip faces the center, the water channel forming member 10 can be made as thin as possible, and the continuous wall portion 4 can be made as thin as possible. Can be thin. As a result, the wall thickness of the continuous wall portion 4 can be made thinner than in the conventional example, and the pitch between the cylinder bores can be reduced. Alternatively, by increasing the diameter of the cylinder bore, it is possible to increase the exhaust amount and thus the output.

Moreover, in the invention according to claim 1,
A pair of front and rear cooling water guide plates 14, 14 projecting left and right from the lower half of the left and right ends of the water channel forming member 10 are expanded along the cylinder outer peripheral surfaces 3b, 3b adjacent to the front and rear, respectively, to introduce the cooling water. Because of the construction of 13/13, the cooling water in the cylinder jacket 8 /
3b smoothly flows along the cooling water guide plates 14 and 14 which are widened, and most of the cooling water is in the cooling water introducing portion 13.1.
3, the cooling water passage 15 and the jacket communication passage 12
Flowing in a large amount into the head jacket 2 located above the continuous meat wall portion 4 through the jacket communication passages 12 and 12.
Exit to 2. In the meantime, the head side portion 4a is strongly cooled. Then, the piston ring is strongly cooled through the cylinder wall. This makes it possible to bring the top ring as close as possible to the top surface of the piston and minimize the ring-shaped dead space that does not contribute to combustion on the outer circumference of the piston to improve the air utilization rate. Further, along with this, the sticking of the top ring due to the carbonization of the unburned portion of the fuel and the lubricating oil can be eliminated.

As the top ring is brought as close as possible to the piston top surface, the position of the piston pin is brought as close as possible to the piston top surface, and the swinging dimension of the crankshaft can be lengthened accordingly. , It is possible to increase the piston stroke and eventually the displacement without changing the physique (height) of the connecting rod engine. That is, it is possible to reduce the size of the multi-cylinder engine relatively and increase the output of the engine. On the contrary, when the piston stroke is not changed, the connecting rod can be set longer as much as the position of the piston pin is closer to the top surface of the piston, so that the piston side pressure can be reduced and, as a result, the friction loss can be reduced.

According to the second aspect of the invention, at least the upper edge 15b of each of the pair of left and right cooling water channels 15 formed in the water channel forming member 10 is formed to have an upward slope in the left-right direction. Even when the cooling water boils in 11a to generate water vapor, the water vapor moves upward along the upper edge 15b of each cooling water passage 15 formed in an upslope,
Escape to the head jacket 22 through the jacket communication passage 12. This keeps the cooling performance high.

In the invention according to claim 3, the water channel forming member 10 is formed by forming two metal plate-like bodies 10a, 10a symmetrically in the front-rear direction, and the non-cavity portions 11, 11 are formed in upper and lower stages. , And left and right jacket communication passages 12.1.
An outer edge joint portion 17 formed by projecting in an outer longitudinal direction on the outer edge of No. 2
Since the 17 members are fixed to each other, the water channel forming member 10 can be easily manufactured only by fixing the metal plate-shaped members 10a molded in the same shape to each other.

In the invention according to claim 4, the left and right side portions of the head leaning portion 4a of the continuous wall portion 4 are formed continuously with the pair of left and right cylinder head fastening boss portions 5, 5, and one outer edge joint is formed. The portion 17 is provided between the cylinder 3 and the cylinder head fastening boss portion 5 on one side, and the outer edge joint portion 17 on the other side.
Is the other cylinder 3 and the cylinder head fastening boss portion 5
Since they are cast while being offset toward the one and the other cylinders 3, respectively, as compared with the conventional example in which the joint portions are superposed on the outside of the left and right jacket communication passages, The substantial passage cross section of the jacket communication passage can be increased.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 shows a water channel forming member according to a first embodiment of the present invention, FIG. 1 (A) is a perspective view of the water channel forming member, and FIG. 1 (B) is a plan view in which the right half of the water channel forming member is broken. FIG. 1C is a vertical cross-sectional view taken along the line CC in FIGS. 1A and 2B. 2 shows a main part of a vertical multi-cylinder engine equipped with a cooling device for a Siamese cylinder according to the present invention, and FIG. 1 (A) is a partial vertical sectional view,
FIG. 2B is a partial plan view of the cylinder block. Further, FIG. 3 is a vertical cross-sectional view of a main part of a vertical multi-cylinder engine equipped with a cooling device for a Siamese cylinder according to the present invention.

In this vertical multi-cylinder engine E, as shown in FIG. 3, a cylinder head 20 is fixed with a head bolt 6 on a cylinder block 1 integrally formed with a crankcase, and a cylinder formed on the cylinder block 1 is formed. The jacket 8 and the head jacket 22 formed on the cylinder head 20 are communicated with each other through a large number of jacket communication holes 24 formed in a portion other than the continuous wall portion 4, and the cylinder head 20 is cooled with cooling water that has cooled the cylinder block 1. Is configured to.

The cooling device for the Siamese cylinder according to the present invention has the same basic structure as the conventional example. That is,
As shown in FIG. 2 and FIG. 3, a plurality of cylinders 3 are arranged in parallel in the cylinder block 1 in the front-rear direction, and adjacent cylinders 3 and 3 are arranged.
Are continuous with the continuous wall portion 4 to form the Siamese cylinder 2, and a cylinder jacket 8 is formed so as to surround the Siamese cylinder 2. A water channel forming member 10, which will be described later, is cast into the continuous wall portion 4.

The characteristic configuration of this apparatus will be described below. As shown in FIG. 1, the water channel forming member 10 includes two metal plate-like bodies 1 which are formed symmetrically by press molding.
0a and 10a are overlapped with each other so as to face each other, and the non-cavity portions 11 formed in the upper and lower multistage and the left and right jacket communication paths 1
The outer edge joint portions 17 and 17 formed by protrudingly projecting in the outer vertical direction on the outer edges of 2 and 12 are integrally formed by seam welding. Thus, the two metal plate-shaped bodies 10a, 10a molded in the same shape can be simply manufactured by simply fixing them to each other.

The water channel forming member 10 is located at the lower half of the jacket communication passages 12 and 12 and a pair of left and right jacket communication passages 12 and 12 located in the upper half of the water passage formation member 10. A non-hollow part formed in a vertically multi-tiered manner alternately between the pair of left and right cooling water introducing parts 13, 13 and between the left and right jacket communication passages 12, 12 and between the left and right cooling water introducing parts 13, 13. 11 and a wedge-shaped cooling water passage 15, and a cylinder jacket 8.
The cooling water in 8 is passed through the pair of left and right cooling water introduction portions 13, 13, the cooling water passages 15, 15 and the jacket communication passages 12, 12 in order to the head jacket 22 located above the continuous meat wall portion 4. It is configured to drain.

The non-cavity portion 1 formed in the upper and lower stages in this manner
1 functions as a rib that mechanically reinforces the continuous wall portion 4, and the cooling water passage 15 that is alternately formed with the non-hollow portion 11 in the upper and lower stages is compared with the flat and vertically long cooling water passage 115 of the conventional example. Therefore, the mechanical strength is remarkably increased. As a result, there is no possibility that partial distortion will occur in the drilling of the cylinder bore 3a.

The wedge-shaped cooling water passages 15 are shown in FIG.
As shown in (A) and (B), the cavity 15a has a wedge shape in a plan view.
Is symmetrically configured so that its tip faces the center. That is, the wall thickness of the continuous wall portion 4 is the thinnest in the central portion,
Although it is thickest at both left and right ends, this continuous wall part 4
The water channel forming member 10 can be made as thin as possible by forming the cooling water channel 15 in a wedge shape in plan view so as to correspond to the wall thickness and symmetrically configured so that its tip faces the center, and thus the continuous wall wall. The portion 4 can be made as thin as possible. As a result, the wall thickness of the continuous wall portion 4 can be made thinner than in the conventional example, and the pitch between the cylinder bores can be reduced. Alternatively, by increasing the diameter of the cylinder bore, it is possible to increase the exhaust amount and thus the output.

The pair of left and right cooling water passages 15 are
As shown in FIG. 1 (A), the upper edge 15b is formed in an upward slope outward in the left-right direction. That is, even when the cooling water boils in each cooling water passage 15 to generate water vapor, the water vapor moves upward along the upper edge 15 b of each cooling water passage 15 formed in an upward slope and passes through the jacket communication passage 12. Escape to the head jacket 22. This keeps the cooling performance high.

Further, a pair of left and right cooling water introducing parts 13, 13
Are a pair of front and rear cooling water guide plates 14.1 protruding from the left and right.
4 is expanded along the outer peripheral surfaces 3b and 3b of the cylinders 3 and 3 adjacent to each other in the front-rear direction. As a result, the frontage of the cooling water introducing portions 13 is formed large. Therefore, most of the cooling water is the cylinder jacket 8.
A large amount of cooling water is introduced into the cooling water passage 15 and the jacket communication passage 12 from the cooling water introduction portions 13 and 13 which are expanded toward 8, and is located above the continuous meat wall portion 4 through the jacket communication passages 12 and 12. Exit to the head jacket 22. In the meantime, a large amount of cooling water flows through the cooling water passages 15 and 15 and the jacket communication passages 12 and 12 to strongly cool the head side portion 4a.

That is, since the piston ring can be strongly cooled through the cylinder wall by strongly cooling the head side portion 4a, the top ring can be brought as close as possible to the piston top surface to burn the outer periphery of the piston top. The ring-shaped dead space that does not contribute can be minimized to improve the air utilization rate. Further, along with this, the sticking of the top ring due to the carbonization of the unburned portion of the fuel can be eliminated.

Moreover, the position of the piston pin is moved as close as possible to the piston top surface as the top ring is moved as close as possible to the piston top surface, and the swinging dimension of the crankshaft is lengthened accordingly. The connecting rod engine can be made relatively small without changing its height and the piston stroke can be increased to increase the displacement. Further, since the head side portion 4a can be strongly cooled, it is possible to increase the exhaust amount by increasing the diameter of the cylinder bore. Further, by applying the present invention to a multi-cylinder engine equipped with a turbocharger, it is possible to achieve relative miniaturization and increase in engine output. On the contrary, when the piston stroke is not changed, the connecting rod can be set longer as much as the position of the piston pin is closer to the top surface of the piston, so that the piston side pressure can be reduced and, as a result, the friction loss can be reduced.

As shown in FIGS. 1 (B) and 2 (B),
By forming the left and right side portions of the head-side portion 4a of the continuous wall portion 4 and the pair of left and right cylinder head fastening boss portions 5, 5 in a continuous manner, the interval between the head bolts 6, 6 is narrowed. The cylinder 3 is configured so as to be fastened uniformly and strongly along the circumferential direction by the amount. The present invention is not limited to this, but by connecting the cylinder head fastening boss portions 5, 5 and both left and right sides of the head-side portion 4a to each other, a jacket communication hole 23 formed in the upper end wall of the cylinder block 1 is formed. A pair of jacket communication passages 12
-There is an advantage that the hole diameter of 12 can be enlarged and a large amount of cooling water can be circulated.

Further, one outer edge joint portion 17 of the outer edges of the jacket communication passages 12, 12 is provided between the one cylinder 3 and the cylinder head fastening boss portion 5 and the other outer edge joint portion 1 thereof.
No. 7 is cast between the other cylinder 3 and the cylinder head fastening boss 5 while being offset toward the one and the other cylinders 3 and 3, respectively. That is, since the interval between the left and right cylinder head fastening bolts 6 is constant, if the joint portion 17 is overlapped on the outside of the left and right jacket communication passages 12 as in the conventional example, the jacket communication passage 12 is substantially formed. The passage cross section is narrowed. Therefore, as described above, the outer edge joints 17, 17 are respectively connected to the cylinders 3
By displacing it toward the 3 side, the substantial passage cross-sectional profile of the jacket communication passage 12 can be increased.

As shown in FIG. 2 (A), the pair of jacket communication passages 12 and 12 are located inside the boss portions 5 and 5 and are located at the upper end wall of the cylinder block 1 and the cylinder head 2.
It communicates with the jacket communication hole 23 opened in the lower end wall of No. 0. Further, as shown in FIG. 1 (A), the upper end portion of the jacket communication passage 12 is slightly taller than the non-hollow portion 11 at the upper edge. This is intended to make the sand core 12b for forming the jacket communication hole 23 hard to break by setting the jacket communication hole 23 in the upper end wall of the cylinder block 1 to be relatively short and set. .

Reference numeral 11a in FIG. 1 (A) is a front and rear meat wall connecting hole of the continuous meat wall portion 4. The non-hollow portion 11 of the present invention is not limited to the one having the front and rear meat wall connecting holes 11a, but in the case of having the front and rear meat wall connecting holes 11a, the continuous meat wall portion during machining of the cylinder bore or during engine operation. There is an advantage that the pressing force acting on No. 4 can be more strongly countered.

FIG. 4 shows a water channel forming member according to a second embodiment of the present invention, FIG. 4 (A) is a perspective view of the water channel forming member, and FIG. 4 (B) is a vertical sectional front view of the water channel forming member. . In this embodiment, as shown in FIGS.
1 is formed in a V shape, and each of the left and right wedge-shaped cooling water channels 1
The upper edge 15b and the lower edge 15c of the No. 5 are formed in an upward slope to the outside in the left-right direction, and the other points are configured similarly to the first embodiment (FIG. 1). That is, even when the cooling water boils in each cooling water passage 15 to generate water vapor, the water vapor moves upward along the upper edge 15 b of each cooling water passage 15 formed in an upward slope and passes through the jacket communication passage 12. Escape to the head jacket 22.

In each of the above-described embodiments, the case where two metal plate-like members are opposed to each other and fixed to each other to form the water channel forming member has been exemplified. However, the water channel forming member is integrally molded by, for example, precision casting. It doesn't matter.

[Brief description of drawings]

1 shows a water channel forming member according to a first embodiment of the present invention, FIG. 1 (A) is a perspective view of the water channel forming member, and FIG. 1 (B) is a cutaway right half of the water channel forming member. Top view, Figure 1
1C is a vertical cross-sectional view taken along the line C-C in FIGS. 1A and 1B.

FIG. 2 shows a main part of a vertical multi-cylinder engine equipped with a Siamese cylinder cooling device according to the present invention.
2A is a partial vertical sectional view, and FIG. 2B is a partial plan view of the cylinder block.

FIG. 3 is a vertical cross-sectional view of a main part of a vertical multi-cylinder engine equipped with a cooling device for a Siamese cylinder according to the present invention.

FIG. 4 shows a water channel forming member according to a second embodiment of the present invention, FIG. 4 (A) is a perspective view of the water channel forming member, and FIG. 4 (B) is a vertical sectional front view of the water channel forming member.

FIG. 5 shows a conventional example, FIG. 5 (A) is a vertical cross-sectional view of a main part of a Siamese cylinder of a vertical engine, and FIG. 5 (B) is a cross-sectional plane taken along the line BB in FIG. 5 (A). FIG. 5 (C) is a perspective view of the water channel forming member.

[Explanation of symbols]

1 ... Cylinder block, 2 ... Siamese cylinder, 3
... Cylinder 3a ... Cylinder bore 3b ... Cylinder outer peripheral surface 4 ... Continuous wall portion 4a ... Head portion of continuous wall portion 5 ... Cylinder head fastening boss portion 8 ... Cylinder jacket 10 ... Water channel Forming member, 10a ... Metal plate, 11 ... Non-hollow part, 12 ... Jacket communication path, 13 ...
Cooling water introduction part, 14 ... Cooling water guide plate, 15 ... Wedge-shaped cooling water channel, 15a ... Wedge-shaped cavity part, 15b ... Upper edge of cooling water channel, 17 ... Outer edge joint part, 22 ... Head jacket, E ... Many Cylinder engine.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hoichi Kamata 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd. (72) Inventor Masahiko Sugimoto 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd. (72) ) Inventor Nobuhiro Yamamoto 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd.

Claims (4)

[Claims] 1. A water channel forming member (1) is provided at a head portion (4a) of a continuous wall portion (4) of a siamese cylinder (2).
0) is cast to cool the cooling water in the cylinder jackets (8) and (8) to the pair of left and right cooling water introducing portions (13) and (13) formed in the water channel forming member (10) and the cooling water channel (15).
In a cooling device for a Siamese cylinder, which is configured to flow out to a head jacket (22) located above the continuous meat wall portion (4) through the (15) and the jacket communication passages (12) and (12) in order, The water channel forming member (10) is located below the pair of left and right jacket communication passages (12) and (12) located in the upper half portion, and below the jacket communication passages (12) and (12), and each cylinder jacket ( 8) A pair of left and right cooling water introduction portions (13) (13) opening toward (8) and the left and right cooling water introduction portions (1) between the left and right jacket communication passages (12) (12).
3) A non-cavity portion (11) and a wedge-shaped cooling water channel (15) alternately formed in upper and lower stages are provided between (13), and each wedge-shaped cooling water channel (15) is formed. The cavities (15a) having a wedge shape in a plan view are symmetrically configured so that the tip ends thereof are directed toward the center, and the pair of left and right cooling water introducing portions (13) and (13) are provided in a pair of front and rear projections, respectively. Cooling water guide plates (14) (14)
A cooling device for a siamese cylinder, characterized in that the cooling device is configured by expanding along the outer peripheral surfaces (3b), (3b) of the cylinders (3), (3) adjacent to each other in the front and rear. 2. The pair of left and right cooling water channels (15),
The cooling device for a siamese cylinder according to claim 1, wherein at least an upper edge (15b) thereof is formed to have an upward slope in the lateral direction. 3. The non-hollow part (11) in which the water channel forming member (10) is formed by forming two metal plate-like bodies (10a) (10a) in a front-rear symmetry by molding, and forming a multi-tiered structure.
(11) to each other and to the left and right jacket communication paths (12)
The cooling device for a siamese cylinder according to claim 1 or 2, wherein outer edge joint portions (17) (17) formed by projecting in an outer longitudinal direction on the outer edge of (12) are fixed to each other. 4. The left and right side portions of the head-side portion (4a) of the continuous wall portion (4) are formed continuously with a pair of left and right cylinder head fastening boss portions (5), (5), and one outer edge The joint portion (17) is between one cylinder (3) and the cylinder head fastening boss portion (5), and the other outer edge joint portion (17) is between the other cylinder (3) and the cylinder head fastening boss. The cooling device for a siamese cylinder according to claim 3, wherein the cooling device is formed by displacing between the portion (5) and one of the cylinders (3) and casting.