JPH11294254A - Cooling device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exclude the necessity for additionally machining a cylinder block by inserting part of a gasket inserted between the cylinder block and a cylinder head into a water jacket. SOLUTION: A gasket 11 is inserted between a cylinder block 1 and a cylinder head. A contraction section 12 is inserted into a water jacket 3 to separate the water jacket 3 into an upper section and a lower section. Since the contraction section 12 is a separate member from the cylinder block 1, the cylindricity of a cylinder bore 2 can be kept at a proper value even at the time of the thermal expansion of the cylinder block 1. The contraction section 12 is part of the gasket 11, and the contraction section 12 can be positioned against the cylinder block 1, thus the necessity for additionally machining the cylinder block 1 to position the contraction section 12 can be excluded, thereby the strength and durability of the gasket 11 can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cooling device for an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, there has been known a cooling device for an internal combustion engine in which a water jacket is formed around a cylinder bore for cooling the internal combustion engine. An example of this type of cooling device for an internal combustion engine is disclosed in, for example, Japanese Utility Model Laid-Open No. 4-14750. 7 is a plan view of a cylinder block when a conventional cylinder head and a gasket are removed, and FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7 and 8, 101 is a cylinder block, 102 is a cylinder bore, 103 is a water jacket formed around the cylinder bore 102, and 104 is a cylinder bore 102.
And the water jacket 103. As shown in FIG. 7, the cooling water supplied from the left side of the cylinder block 101 flows through the water jacket 103 of the cylinder block 101 when the cylinder bore 1
02 is cooled and discharged from the right side of the cylinder block 101. As shown in FIG. 8, the water jacket 103 extends in the axial direction of the cylinder bore from the upper portion to the middle lower portion.

[0003]

By the way, since the temperature of the upper portion of the cylinder block 101 is higher than that of the lower portion, it is necessary to mainly cool the upper portion than the lower portion.
However, as described above, the water jacket 103
Although the water jacket 103 extends in the axial direction of the cylinder bore from the upper portion to the lower portion, the interior of the water jacket 103 is not partitioned by the upper portion and the lower portion. Therefore, the low-temperature cooling water supplied to cool the upper portion of the cylinder block 101 moves to the middle and lower portions in the water jacket 103, and cannot effectively cool the upper portion of the cylinder block 101.

In order to solve this problem, there has been known a cooling device for an internal combustion engine in which an upper portion and a middle and lower portion in a water jacket 103 are separated by a partition portion. FIG. 9 is a sectional view similar to FIG. 8 of a conventional cylinder block having a partition formed integrally with a cylinder block, and FIG. 10 is a diagram of a conventional cylinder block having a partition formed of a separate member from the cylinder block. It is sectional drawing similar to. In FIG. 9, reference numeral 105 denotes a partition formed integrally with the cylinder block 101 '. In FIG. 10, reference numeral 105' denotes a partition formed as a separate member from the cylinder block 101 "and attached to the cylinder block 101". is there. FIG.
And the cylinder block shown in FIG. 10 can prevent low-temperature cooling water supplied to cool the upper part of the cylinder block 101 from moving to the middle and lower parts in the water jacket 103.
1 can be effectively cooled.

However, in the case of the cylinder block 101 'shown in FIG.
Since the cylinder block 101 'is formed integrally with the cylinder block 101', the cylindricity of the cylinder bore 102 cannot be maintained at an appropriate value when the cylinder block 101 'is thermally expanded. In the case of the cylinder block 101 ″ shown in FIG. 10, the cylinder block 101 ″ must be additionally processed in order to position the partition portion 105 ′ with respect to the cylinder block 101 ′.

In view of the above problems, the present invention eliminates the need for additional machining of the cylinder block while maintaining the cylindricity of the cylinder bore at an appropriate value during thermal expansion, and separates the water jacket up and down. It is an object of the present invention to provide a cooling device for an internal combustion engine that can perform the cooling.

[0007]

According to the first aspect of the present invention, a part of a gasket inserted between a cylinder block and a cylinder head is inserted into a water jacket formed around a cylinder bore. Further, there is provided a cooling device for an internal combustion engine in which a water jacket is vertically separated by a part of the gasket.

According to a second aspect of the present invention, there is provided the cooling apparatus for an internal combustion engine according to the first aspect, wherein the gasket is provided separately for each cylinder.

According to a third aspect of the present invention, there is provided the cooling apparatus for an internal combustion engine according to the first aspect, wherein the gasket is a single gasket provided for a plurality of cylinders. Is done.

In the cooling device for an internal combustion engine according to the first to third aspects, the inside of the water jacket can be vertically separated by a part of the gasket. Further, since a part of the gasket is a member separate from the cylinder block, the cylindricity of the cylinder bore during thermal expansion can be maintained at an appropriate value. In addition, since the partition part for vertically separating the inside of the water jacket is a part of the gasket, the partition part can be positioned with respect to the cylinder block by positioning the gasket with respect to the cylinder block. Therefore, it is possible to eliminate the necessity of additional machining of the cylinder block in order to position the partition with respect to the cylinder block.

According to the fourth aspect of the invention, the cooling water flowing in the upper portion of the water jacket is brought into direct contact with a wall disposed between the water jacket and the cylinder bore. The cooling device for an internal combustion engine according to the above is provided.

The cooling device for an internal combustion engine according to claim 4 is
The cooling water flowing in the upper part in the water jacket is brought into direct contact with the wall arranged between the water jacket and the cylinder bore, so that the cooling water is more effective than cooling the wall through a part of the gasket. Can be cooled.

According to the fifth aspect of the present invention, the water jacket formed around the cylinder bore and the water jacket formed in the cylinder head communicate with each other. Is provided.

According to a fifth aspect of the present invention, there is provided a cooling device for an internal combustion engine.
Since the cooling water flowing in the upper part of the water jacket formed around the cylinder bore can be supplied to the cylinder head, not only the cylinder block but also the cylinder head adjacent to the cylinder block is supplied by the cooling water supplied to the cylinder block. Can also be cooled.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view of a gasket and a cylinder block when a cylinder head is removed in a first embodiment of a cooling device for an internal combustion engine of the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG. FIG. 3 is an enlarged view of part III of FIG. 1 to 3, reference numeral 1 denotes a cylinder block, 2 denotes a cylinder bore, 3 denotes a water jacket formed around the cylinder bore 2, and 4 denotes a wall disposed between the cylinder bore 2 and the water jacket 3. 11
Is a gasket inserted between the cylinder block 1 and a cylinder head (not shown), and 12 is a water jacket 3
The throttle portion is inserted into the water jacket 3 and separates the inside of the water jacket 3 into an upper portion and a middle lower portion. As shown in FIG. 1, the cooling water supplied from the left side of the cylinder block 1 cools the cylinder bore 2 when flowing through the water jacket 2 of the cylinder block 1 and is discharged from the right side of the cylinder block 1. As shown in FIG. 2, the water jacket 3 extends in the axial direction of the cylinder bore from the upper part to the middle lower part.

As described above, according to the present embodiment, the inside of the water jacket 3 is divided into an upper portion and a middle lower portion.
Therefore, as in the case where the inside of the water jacket is not separated into the upper part and the middle and lower parts, low-temperature cooling water supplied to cool the upper part of the cylinder block 1 moves to the middle and lower parts in the water jacket. That can be avoided. Therefore, the upper part of the cylinder block 1 can be effectively cooled. Further, the throttle portion 12 of the gasket 11 that separates the inside of the water jacket 3 into an upper portion and a middle lower portion is a separate member from the cylinder block 1. Therefore, even when the cylinder block 1 is thermally expanded, the cylindricity of the cylinder bore can be maintained at an appropriate value. Also, a squeezing section 12 for separating the inside of the water jacket into an upper part and a middle lower part.
Is a part of the gasket 11. Therefore, by positioning the gasket 11 with respect to the cylinder block 1, the throttle unit 12 can be positioned with respect to the cylinder block 1 without having to separately position the throttle unit 12 with respect to the cylinder block 1. therefore,
It is possible to eliminate the necessity of additionally processing the cylinder block 1 in order to separately position the throttle unit 12 with respect to the cylinder block 1. Further, since it is not necessary to arrange a new member separate from the cylinder block 1 and the gasket 11 in order to separate the inside of the water jacket 3 into an upper portion and a lower portion, the number of components of the cooling device of the internal combustion engine can be reduced. Can be. In addition, the squeezed portion 12 which is a part of the gasket 11
By immersing the gasket into the water jacket 3, the gasket 11 itself can be cooled, and therefore, the strength and durability of the gasket 11 can be improved.

FIG. 4 is an enlarged view similar to FIG. 3 of the second embodiment of the cooling device for an internal combustion engine of the present invention. In the second embodiment, components not shown are the same as the components of the first embodiment, 21 is a gasket, 22 is a wall 4 disposed between the cylinder bore 2 and the water jacket 3.
Is a narrowed portion having a hole 23 on the side of. As shown in FIG. 4, according to the present embodiment, the cooling water flowing in the upper part in the water jacket 3 can be brought into direct contact with the wall 4 arranged between the water jacket 3 and the cylinder bore 2. Therefore, the wall 4 can be cooled more effectively than when the cooling water indirectly cools the wall 4 via a part of the gasket.

FIG. 5 is an enlarged view similar to FIG. 3 of a third embodiment of the cooling device for an internal combustion engine of the present invention. In the third embodiment, parts not shown are the same as the parts of the first embodiment, 31 is a gasket, 32 is a wall 4 disposed between the cylinder bore 2 and the water jacket 3.
Is a bent portion of the gasket formed to open. As shown in FIG. 5, according to the present embodiment, similarly to the second embodiment, the cooling water flowing in the upper part of the water jacket 3 is supplied to the wall 4 disposed between the water jacket 3 and the cylinder bore 2. Can be in direct contact.
Therefore, the wall 4 can be cooled more effectively than when the cooling water indirectly cools the wall 4 via a part of the gasket.

FIG. 6 is an enlarged view similar to FIG. 3 but showing a modification of the third embodiment of the cooling device for an internal combustion engine of the present invention. In the modification of the third embodiment, components not shown are the same as the components of the first embodiment. Reference numeral 41 denotes a gasket, and reference numeral 42 denotes an open side of a wall 4 disposed between the cylinder bore 2 and the water jacket 3. This is a bent portion of the gasket formed so as to be bent. As shown in FIG. 6, this modification is a modification of the third embodiment in which the bending direction is changed. The bent portion 42 of the present modification also has the same effect as the second and third embodiments because the side of the wall 4 is open similarly to the bent portion 32 of the third embodiment.

Although not shown, in another embodiment, the water jacket 3 and a water jacket (not shown) formed in a cylinder head (not shown) are provided to supply the cooling water flowing in the upper portion of the water jacket 3 to the cylinder head. It is possible to make changes to all the embodiments described above so as to communicate. According to the present embodiment, not only the cylinder block 1 but also the cylinder head adjacent to the cylinder block via the gasket can be cooled by the cooling water supplied to the cylinder block 1.

In all of the above embodiments,
The gasket is formed as a single gasket provided for multiple cylinders, but in other embodiments,
The gasket can be formed as a separate gasket for each cylinder or for each cylinder group consisting of several cylinders.

[0023]

According to the first to third aspects of the present invention,
While maintaining the cylindricity of the cylinder bore at an appropriate value during thermal expansion, it is possible to eliminate the need for additional machining of the cylinder block and to separate the water jacket up and down.

According to the fourth aspect of the invention, the wall can be cooled more effectively than when the wall is cooled by a part of the gasket with the cooling water.

According to the fifth aspect of the present invention, not only the cylinder block but also the cylinder head adjacent to the cylinder block can be cooled by the cooling water supplied to the cylinder block.

[Brief description of the drawings]

FIG. 1 is a plan view of a gasket and a cylinder block when a cylinder head is removed in a first embodiment of a cooling device for an internal combustion engine of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged view of a part III of FIG. 2;

FIG. 4 is an enlarged view similar to FIG. 3 in a second embodiment of the cooling device for an internal combustion engine of the present invention.

FIG. 5 is an enlarged view similar to FIG. 3 in a third embodiment of the cooling device for an internal combustion engine of the present invention.

FIG. 6 is an enlarged view similar to FIG. 3 in a modification of the third embodiment of the cooling device for an internal combustion engine of the present invention.

FIG. 7 is a plan view of a cylinder block when a conventional cylinder head and a gasket are removed.

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7;

FIG. 9 is a sectional view similar to FIG. 8 of a conventional cylinder block having a partition formed integrally with the cylinder block.

FIG. 10 is a sectional view similar to FIG. 8 of a conventional cylinder block having a partition part made of a cylinder block and another member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cylinder block 2 ... Cylinder bore 3 ... Water jacket 11 ... Gasket 12 ... Restricted part

Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16J 15/08 F16J 15/08 M

Claims (5)

[Claims] 1. A part of a gasket inserted between a cylinder block and a cylinder head is inserted into a water jacket formed around a cylinder bore, and the inside of the water jacket is vertically separated by a part of the gasket. Internal combustion engine cooling device. 2. The cooling device for an internal combustion engine according to claim 1, wherein said gasket is provided separately for each cylinder. 3. The cooling device for an internal combustion engine according to claim 1, wherein said gasket is a single gasket provided for a plurality of cylinders. 4. The cooling water flowing in an upper part in the water jacket is brought into direct contact with a wall disposed between the water jacket and the cylinder bore.
3. The cooling device for an internal combustion engine according to claim 1. 5. The cooling device for an internal combustion engine according to claim 1, wherein a water jacket formed around the cylinder bore communicates with a water jacket formed in the cylinder head.