JP2002161743A - Cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent cooling water from stagnating at a lower part of a jacket at a part coping with a cooling water outlet port and improve the cooling efficiency in an cooling device of an internal combustion engine in which a water jacket is formed between a cylinder block outer wall and a Siamese cylinder barrel, a partitioning barrel is installed between the Siamese cylinder barrel and the cylinder block outer wall at an end along an arrangement direction of the cylinder barrel, the cooling water inlet passage introducing cooling water into the water jacket and the cooling water outlet passage guiding the cooling water of the water jacket into a cylinder head side are arranged at an end side along the arrangement direction as binding the partitioning part between each other. SOLUTION: A circulating passage 22 circulating cooling water from the cooling water inlet passage of the water jacket into the cooling water outlet passage is formed between a lower part of the partioning part 16 and a bottom face of the water jacket 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling apparatus for an internal combustion engine, and more particularly to a siamese cylinder barrel between an outer wall of a cylinder block and a siamese cylinder barrel formed by integrally combining a plurality of cylinder barrels arranged in a line. A water jacket is formed so as to approach substantially the entire circumference of the cylinder, a partition portion is provided between the siamese cylinder barrel and the outer wall of the cylinder block at one end side along the arrangement direction of the cylinder barrel, and cooling water for introducing cooling water to the water jacket is provided. A cooling device for an internal combustion engine, wherein an inlet passage and a cooling water outlet passage for leading the cooling water of the water jacket to the cylinder head side are arranged at one end side along the arrangement direction so as to sandwich the partition portion therebetween. .

[0002]

2. Description of the Related Art Conventionally, such a cooling device is disclosed in, for example, Japanese Patent Application Laid-Open No. 55-66612 and Japanese Patent Application Laid-Open No. 7-25955.
The cooling water introduced into the water jacket from the cooling water inlet passage flows almost all the way around the entire circumference of the Siamese cylinder barrel in one direction, and flows out from the cooling water outlet passage toward the cylinder head. It is configured to be.

[0003]

Incidentally, in the above-mentioned conventional cooling device, the partition portion is configured to completely shut off the water jacket. However, since the cooling water outlet passage communicates with the upper part of the water jacket, if the partition portion is configured to completely shut off the water jacket, the water jacket of the water jacket is formed at the portion where the cooling water outlet passage is arranged. Cooling water stagnation occurs in the lower part, and the cooling effect of the cooling water is reduced.

The present invention has been made in view of such circumstances, and can prevent the stagnation of the cooling water at the lower portion of the water jacket at a portion corresponding to the cooling water outlet passage, thereby improving the cooling effect. An object of the present invention is to provide a cooling device for an internal combustion engine as described above.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, an outer wall of a cylinder block is provided.
A water jacket is formed between the plurality of cylinder barrels arranged in a line and a siamese cylinder barrel formed integrally with the siamese cylinder barrel. The water jacket faces substantially the entire circumference of the siamese cylinder barrel. A partition portion is provided between the cylinder barrel and the outer wall of the cylinder block, a cooling water inlet passage for introducing cooling water to the water jacket, and a cooling water outlet passage for leading cooling water of the water jacket to the cylinder head side, In a cooling device for an internal combustion engine arranged at one end side in the arrangement direction so as to sandwich a partition portion therebetween, a cooling water inlet of the water jacket is provided between a lower portion of the partition portion and a bottom surface of the water jacket. Flow cooling water from the passage to the cooling water outlet passage Characterized in that the passage is formed.

According to such a configuration, the cooling water introduced into the water jacket from the cooling water inlet passage basically rotates substantially the entire circumference of the siamese cylinder barrel in one direction, and the cooling water exit passage side However, since part of the cooling water flows from the cooling water inlet passage through the flow passage to the lower portion of the water jacket on the cooling water outlet passage side, the water jacket at the portion corresponding to the cooling water outlet passage There is no stagnation of the cooling water at the lower part of the space, and the cooling effect by the cooling water can be improved.

[0007] The invention according to claim 2 provides the above-described claim 1.
In addition to the configuration of the invention described, the partition portion is configured by fitting an elastic body between the cylinder block outer wall and the siamese cylinder barrel, and according to the configuration, the cylinder block and When connecting the cylinder head, the tightening load acting on the Siamese cylinder barrel from the partition is absorbed by an elastic body, and local deformation occurs in the Siamese cylinder barrel due to the provision of the partition. Can be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIGS. 1 to 4 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing a part of an internal combustion engine, and is a sectional view taken along line 1-1 in FIG. 2 is a plan view of the cylinder block as viewed from the direction of the arrows 2-2 in FIG. 1, FIG. 3 is an enlarged sectional view taken along the line 3-3 in FIG. 2, and FIG. 4 is a sectional view taken along the line 4-4 in FIG. .

First, in FIG. 1 and FIG.
The cylinder block 8 provided in the cylinder internal combustion engine includes a siamese cylinder barrel 10 in which four cylinder barrels 9, 9,... Arranged in a line are integrally connected. Each cylinder barrel 9, 9,.
The cylinder liners 12, 12,... Forming the 1, 11,.

The cylinder block 8 is formed as an open deck type, and a water jacket 14 having an upper surface opened on the connecting surface of the cylinder block 8 to the cylinder head 13 faces substantially the entire circumference of the siamese cylinder barrel 10. And formed between the cylinder block outer wall 15 and the Siamese cylinder barrel 10.

A partition 16 is provided between the siamese cylinder barrel 10 and the cylinder block outer wall 15 at one end (the left end in FIGS. 1 and 2) along the arrangement direction of the cylinder barrels 9, 9,. A cooling water inlet passage 17 through which cooling water passes through the jacket 14;
And a cooling water outlet passage 18 extending to the side.
6 are arranged on one end side in the arrangement direction so as to sandwich them between each other.

A gasket 19 is interposed between the cylinder block 8 and the cylinder head 13 so as to cover an upper end opening of the water jacket 14, and a cooling water outlet passage 18 allows the cooling water in the water jacket 14 to flow through the cylinder. The gasket 19 is provided so as to be guided to a water jacket 20 provided on the head 13.
The cooling water inlet passage 17 is provided in the cylinder block 8.

By the arrangement of the cooling water inlet passage 17, the cooling water outlet passage 18 and the partition portion 16, the main flow of the cooling water introduced from the cooling water inlet passage 17 into one end of the water jacket 14 is transmitted to the Siamese cylinder barrel. 10 flows in the water jacket 14 toward the other end along the arrangement direction of the cylinder barrels 9, 9,..., And is further inverted by 180 degrees so that the water jacket 14 flows through the water jacket 14 on the other side of the siamese cylinder barrel 10. .. Flows to one end of the cylinder barrels 9, 9,... In the arrangement direction, and is led out of the cooling water outlet passage 18 to the water jacket 20 of the cylinder head 13.

By the way, Siamese cylinder barrel 1
0, the portion of the connecting portion of the cylinder barrels 9, 9,... Facing the water jacket 14 is formed in a concave shape inward, so that the cooling water flows into the water jacket 14 at the portion corresponding to the connecting portion. Stagnation may occur. Therefore, notches 21, 21... Are provided at the upper portions of the connection portions of the cylinder barrels 9, 9.
A communication hole (not shown) communicating with the water jacket 20 in the cylinder head 13 is provided corresponding to each of the notches 21, 21,. Thereby, a part of the cooling water in the water jacket 14 flows from the portion corresponding to the connecting portion of the cylinder barrels 9, 9,... To the water jacket 20 of the cylinder head 13 through the notches 21, 21,. As a result, the cooling water does not stagnate in the portion corresponding to each connecting portion in the water jacket 14.

Further, the cooling water outlet passage 1 disposed at a position sandwiching the partition 16 with the cooling water inlet passage 17.
8 communicates with the upper portion of the water jacket 14, so that the partition 16
When the cooling water outlet passage 18 is disposed, the water jacket 1 is completely shut off.
There is a possibility that stagnation of the cooling water may occur in the lower part of 4.

Therefore, as shown in FIG.
Between the lower portion of the water jacket 14 and the bottom surface of the water jacket 14.
A flow passage 22 for flowing the cooling water from the side 7 to the cooling water outlet passage 18 is formed.

Referring also to FIG. 4, the partition 16
Is constructed by fitting an elastic body 23 containing a core member 24 between the cylinder block outer wall 15 and the siamese cylinder barrel 10.
3 is fitted between the cylinder block outer wall 15 and the Siamese cylinder barrel 10 so as to form a flow passage 22 between a lower portion thereof and a bottom surface of the water jacket 14.

In order to fit the elastic body 23, a recess 25 is provided in the upper inner surface of the outer wall 15 of the cylinder block, and the elastic body 23 is integrally provided with a projection 23a which fits elastically into the recess 25. Provided.

The core member 24 includes a vertically extending flat plate portion 24a.
And a rectangular tube portion 24b formed in a rectangular cross section and integrally connected to the upper portion of the flat plate portion 24a, and formed by bending a metal plate. That is, a part of the square tube portion 24b is
The core member 24 is built in the elastic body 23 so as to be disposed on the side of the concave portion 25 by a distance L from the inner surface of the elastic member 23.

Next, the operation of the first embodiment will be described. The cooling water introduced from the cooling water inlet passage 17 into the water jacket 14 formed between the cylinder block outer wall 15 and the siamese cylinder barrel 10 is basically Flows around the entire circumference of the siamese cylinder barrel 10 substantially in one direction toward the cooling water outlet passage 18 side, so that the cooling water inlet passage 17 and the cooling water inlet passage 17 arranged at one end side along the arrangement direction of the cylinder barrels 9, 9,. Cooling water outlet passage 1
In the case where the partition 16 disposed between the water jackets 8 is configured to completely shut off the water jacket 14, the water jacket 14 is disposed at a portion where the cooling water outlet passage 18 communicating with the upper portion of the water jacket 14 is disposed. There is a possibility that stagnation of the cooling water may occur at the lower part of 14.

However, a flow passage 22 is formed between the lower portion of the partition portion 16 and the bottom surface of the water jacket 14 for flowing the cooling water from the cooling water inlet passage 17 side of the water jacket 14 to the cooling water outlet passage 18 side. A part of the cooling water introduced from the cooling water inlet passage 17 into the water jacket 14 flows from the cooling water inlet passage 17 through the flow passage 22 to the lower portion of the water jacket 14 on the cooling water outlet passage 18 side. Therefore, the cooling water outlet passage 18
Therefore, the cooling water does not stagnate at the lower portion of the water jacket 14 at the portion corresponding to the above, so that the cooling effect due to the stagnation of the cooling water can be avoided and the cooling effect by the cooling water can be improved.

The partition 16 is formed by fitting an elastic body 23 between the cylinder block outer wall 15 and the siamese cylinder barrel 10, so that when the cylinder block 8 and the cylinder head 13 are connected, the partition 16 The elastic body 23 absorbs the tightening load acting on the Siamese cylinder barrel 10 from the above, thereby preventing the Siamese cylinder barrel 10 from being locally deformed due to the provision of the partition portion 16. be able to.

Further, a core member 24 is provided in the elastic body 23, and the elastic body 23 is
The protrusion 23a on the upper part of the elastic body 23 is elastically fitted into the concave part 25 provided on the upper inner surface of the cylinder block, and is fitted between the cylinder block outer wall 15 and the siamese cylinder barrel 10, and the core member 24 is one of them. The portion is disposed in the elastic body 23 so as to be disposed on the concave portion 25 side by a distance L from the inner surface of the cylinder block outer wall 15.

Therefore, the protrusion 23a of the elastic body 23 is provided.
The core member 24 prevents the protrusion 23a from being deformed such that the elastic fitting state of the protrusion 23a to the concave portion 25 is released.
The elastic body 23 is prevented from coming off from between the cylinder block outer wall 15 and the siamese cylinder barrel 10, the elastic body 23 is securely brought into close contact with the cylinder block outer wall 15 and the siamese cylinder barrel 10, and cooling is performed at a portion other than the flow passage 22. Water can be prevented from leaking from the cooling water inlet passage 17 to the cooling water outlet passage 18.

FIGS. 5 and 6 show a second embodiment of the present invention. FIG. 5 is a sectional view corresponding to FIG. 3, and FIG. 6 is a sectional view taken along line 6-6 of FIG.

Between the cylinder block outer wall 15 and the siamese cylinder barrel 10, a partition 1 forming a flow passage 22 with the bottom surface of the water jacket 14.
The partition 16 'is formed by fitting an elastic body 23' containing a core member 24 'between the cylinder block outer wall 15 and the Siamese cylinder barrel 10.

The elastic body 23 'is integrally provided with a projection 23a' which elastically fits into a recess 25 provided in the upper inner surface of the cylinder block outer wall 15. The core member 24 ′
Formed by bending a metal plate having a flat plate portion 24a 'extending vertically and a reversing portion 24b' formed in a substantially U-shape opened downward and integrally connected to the upper portion of the flat plate portion 24a '. The upper part of the core member 24 ′, that is, a part of the reversing part 24 b ′ is arranged on the recess 25 side by a distance L ′ from the inner surface of the cylinder block outer wall 15,
A core member 24 'is housed in the elastic body 23'.

The surface of the elastic body 23 'facing the siamese cylinder barrel 10 is provided with a plurality of (two in this embodiment) grooves 26, 26 extending vertically.
A plurality of (two in this embodiment) grooves 27, 27 extending vertically are provided on the surface of the 3 'facing the cylinder block outer wall 15.

According to the second embodiment, in addition to the effects of the first embodiment, the workability when fitting the elastic body 23 'between the cylinder block outer wall 15 and the siamese cylinder barrel 10 is improved. Can be. That is, a plurality of grooves 26, 2 are formed on the surface of the elastic body 23 'facing the siamese cylinder barrel 10 and the cylinder block outer wall 15.
6; 27, 27 are provided, so that the contact area of the elastic body 23 ′ with the siamese cylinder barrel 10 and the cylinder block outer wall 15 is reduced, and the frictional resistance when the elastic body 23 ′ is inserted is reduced, so that the fitting is achieved. The mounting work can be facilitated.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible.

[0032]

As described above, according to the first aspect of the present invention, a part of the cooling water in the water jacket passes from the cooling water inlet passage through the flow passage to the lower part of the water jacket on the cooling water outlet passage. To prevent the stagnation of the cooling water at the lower part of the water jacket at the portion corresponding to the cooling water outlet passage, and the cooling effect by the cooling water can be improved.

According to the second aspect of the invention, it is possible to prevent local deformation of the Siamese cylinder barrel due to the provision of the partition.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a part of an internal combustion engine according to a first embodiment, and is a sectional view taken along line 1-1 in FIG.

FIG. 2 is a plan view of the cylinder block as viewed from the direction of arrows 2-2 in FIG. 1;

FIG. 3 is an enlarged sectional view taken along line 3-3 of FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;

FIG. 5 is a sectional view corresponding to FIG. 3 of a second embodiment.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

[Explanation of symbols]

 9 ... Cylinder barrel 10 ... Siamese cylinder barrel 13 ... Cylinder head 14 ... Water jacket 15 ... Cylinder block outer wall 16,16 '... Partition part 17 ... Cooling water inlet passage 18 ... Cooling water outlet passage 22 ... Flow passage 23,23 '... Elastic body

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukio Konishi 1-4-1 Chuo, Wako-shi, Saitama Prefecture Inside Honda R & D Co., Ltd. (72) Yuji Mitsumori 1-4-1 Chuo, Wako-shi, Saitama No. Within Honda R & D Co., Ltd. (72) Inventor Makoto Ito 2-3-7 Chuo, Wako-shi, Saitama F-term in Sanno Tec Co., Ltd. 3G024 AA28 CA11 DA18

Claims (2)

[Claims] An almost entire Siamese cylinder barrel (10) is provided between an outer wall (15) of a cylinder block and a Siamese cylinder barrel (10) formed by integrally joining a plurality of cylinder barrels (9) arranged in a line. A water jacket (14) facing the periphery is formed, and partitions (16, 16 ') are provided between the siamese cylinder barrel (10) and the cylinder block outer wall (15) at one end side in the arrangement direction of the cylinder barrel (9). A cooling water inlet passage (17) for introducing cooling water into the water jacket (14), and a cooling water outlet passage (18) for leading cooling water from the water jacket (14) to the cylinder head (13) side. ) And the partition (16,
16 '), the cooling device for an internal combustion engine arranged at one end side in the arrangement direction with the lower portion of the partition portion (16, 16') and the bottom surface of the water jacket (14) interposed therebetween. In the meantime, a flow passage (2) through which cooling water flows from the cooling water inlet passage (17) side of the water jacket (14) to the cooling water outlet passage (18).
2. A cooling device for an internal combustion engine, wherein 2) is formed. 2. An elastic body (23, 23 ') is fitted between the cylinder block outer wall (15) and the siamese cylinder barrel (10) to form the partition portion (1).
6. The cooling device for an internal combustion engine according to claim 1, wherein the cooling device comprises: