JP2007056771A - Cooling device of water-cooled internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling device of a water-cooled internal combustion engine in which the inside of a water jacket is partitioned into an upper part and a lower part by easily inserting a partition member into the water jacket. <P>SOLUTION: This cooling device comprises the partition member 4 partitioning the inside of the water jacket 5 around a cylinder bore in a cylinder block 1 into the upper part 5a and the lower part 5b. A cooling water larger in quantity than that at the lower part 5b of the water jacket flows at the upper part 5a of the water jacket partitioned by the partition member 4. The partition member 4 is formed of an elastic body. The partition member 4 is held by a separate holding member 7 facing downward from a part of a cylinder head gasket 3 interposed between the cylinder block 1 and the cylinder head 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cooling device in a water-cooled internal combustion engine.

  Conventionally, in a cylinder block of an internal combustion engine, if the upper portion of the cylinder bore close to the combustion chamber is appropriately cooled, the lower portion of the cylinder bore far from the combustion chamber is supercooled, and the temperature difference between the upper portion of the cylinder bore and the lower portion of the cylinder bore is increased, resulting in distortion. In order to facilitate this, as disclosed in Patent Document 1, a throttle is provided in the gasket interposed between the cylinder block and the cylinder head, and this throttle is inserted into a water jacket formed around the cylinder bore. Thus, there is a structure in which the inside of the water jacket is vertically separated by the throttle portion.

Further, as disclosed in Patent Document 2, a partition member that is inserted into a water jacket around the cylinder bore and separates the water jacket up and down is provided, and a projecting piece of the partition member and a projecting piece of the cylinder gasket are provided. There is a structure in which the two are integrally connected by caulking.
JP 11-294254 A JP 2000-345838 A

  In the configuration disclosed in Patent Document 1, since the drawn portion is deep drawn in the cylinder head gasket, the product accuracy is reduced, the influence on the seal is reduced, and the insertion workability into the water jacket is deteriorated. In addition, there is a problem that the cylinder head gasket needs to be made of an expensive material for countermeasures such as residual stress by deep drawing, and the cost is increased.

  In the configuration disclosed in Patent Document 2, the partition member is a flat plate made of stainless steel or the like, so that the workability of insertion into the water jacket is poor, and the protrusion on the gasket side and the partition member side There is a problem in that workability is poor because it is necessary to caulk the protruding piece.

  The present invention has been devised in view of the above-described conventional problems, and provides a cooling apparatus for a water-cooled internal combustion engine that can be easily inserted into a water jacket and can be well separated into the upper and lower sides. According to the first aspect of the present invention, a partition member for partitioning the inside of the water jacket around the cylinder bore into an upper part and a lower part is provided, and the upper part of the water jacket partitioned by the partition member is cooled with a larger amount of water than the lower part of the water jacket. In a cooling apparatus for a water-cooled internal combustion engine configured to flow water, the partition member is formed of an elastic body that can be inserted into a water jacket, and the partition member is interposed between a cylinder block and a cylinder head. It is held by a separate holding member provided downward from the cylinder head gasket.

  According to a second aspect of the present invention, the holding member has a U-shape, an upper end of the holding member abuts on a lower surface of the cylinder head, and the lower end holds the partition member at a predetermined height in the water jacket. It is.

  According to a third aspect of the present invention, in the state in which the partition member is inserted into the water jacket, a communication gap that connects the upper portion of the water jacket and the lower portion of the water jacket is formed at a position between the cylinders in the cylinder row direction. It is configured.

  A fourth aspect of the present invention is that a plurality of the holding members are arranged between cylinder head bolts arranged in the cylinder row direction.

  According to a fifth aspect of the present invention, a substantially horizontal engagement portion is formed at the lower end of the holding member, and an engagement recess into which the engagement portion is engaged is formed in the partition member. It is.

In the cooling device for a water-cooled internal combustion engine of the present invention, a partition member that partitions the interior of the water jacket into an upper part and a lower part is formed of an elastic body that can be inserted into the water jacket, and the partition member is interposed between the cylinder block and the cylinder head. Since the partition member is made of an elastic body by being held by a separate holding member provided downward from the cylinder head gasket, the workability of insertion into the water jacket can be improved, and the holding member is also a separate part. For this reason, the degree of freedom in setting the cylinder head gasket is expanded.
In addition, since the partition member, the holding member, and the cylinder head gasket are separate, the product accuracy of the cylinder head gasket can be relaxed, and the influence on the sealing performance can be greatly reduced, so that an inexpensive material can be used. Therefore, the product cost can be reduced.

  Further, the holding member has a U-shape, the upper end of which is in contact with the lower surface of the cylinder head, and the lower end is configured to hold the partition member at a predetermined height position in the water jacket. When the portion is assembled in contact with the lower surface of the cylinder head, the lower end of the holding portion is disposed at a predetermined height position in the water jacket, and the partition member can be reliably held at the predetermined height position in the water jacket. Thus, the cooling water passage at the upper part of the cylinder block is surely secured, and the cooling efficiency is improved. Further, it is not necessary to change the shape of the cylinder block upper surface.

  In addition, with the partition member inserted in the water jacket, a communication gap that connects the upper portion of the water jacket and the lower portion of the water jacket is formed at a position between the cylinders in the cylinder row direction. When cooling water is poured into the jacket, the air can be easily extracted through the communication gap, and the cold water at the bottom of the water jacket is guided well through the communication gap to the upper water jacket, The cooling performance is improved.

  Further, since the holding member is arranged between the cylinder head bolts arranged in the cylinder row direction, the holding member supporting the partition member is arranged between the cylinder head bolts so that the holding member is partitioned. The members can be supported evenly, the shape before the partition member is inserted into the water jacket is stabilized, and the insertion operation can be easily performed.

  In addition, a substantially horizontal engaging portion is formed at the lower end of the holding member, and an engaging recess into which the engaging portion is engaged is formed in the partition member, so that the partition member and the holding member Assembling work becomes easy, and workability is improved.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic explanatory view of a cooling device for a water-cooled internal combustion engine. A cylinder head 2 is fixed on a cylinder block 1 of the internal combustion engine, and a cylinder head is interposed between the cylinder block 1 and the cylinder head 2. A gasket 3 is interposed.
A partition member 4 is disposed in a water jacket 5 formed in the cylinder block 1, and the partition member 4 partitions the inside of the water jacket 5 into a water jacket upper portion 5a and a water jacket lower portion 5b.
The cooling water supplied from the water pump is supplied to the water jacket upper part 5a and the water jacket lower part 5b, respectively, and is also supplied to the water jacket formed on the cylinder head 2 side, so that the cylinder block 1 and the cylinder head 2 The cooling water is cooled, and then the cooling water passes through the outlet housing and is returned to the water pump. A part of the cooling water is cooled by the radiator and then returned to the water pump.

FIG. 2 is a plan view of a configuration in which the cylinder head gasket 3 is disposed on the upper surface of the cylinder block 1, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. BB line sectional drawing is shown.
In this example, the cylinder block 1 is provided with four cylinders 6a, 6b, 6c, 6d, and a water jacket 5 is formed around the cylinder bore 1a forming the cylinders 6a, 6b, 6c, 6d. The partition member 4 that divides the water jacket 5 into a water jacket upper part 5a and a water jacket lower part 5b is an elastic body that can be inserted into the water jacket 5 from the upper side and is formed in a shape as shown in FIG. It is.

  In the state where the partition member 4 of FIG. 10 is inserted into the water jacket 5 of the cylinder block 1 shown in a plan view in FIG. 11, the communication gaps S, formed between the cylinders 6a, 6b, 6c, 6d, The portions other than S and S are configured such that the partition member 4 is in close contact with the inner wall of the water jacket 5.

As shown in an enlarged view in FIG. 5, the partition member 4 has a vertical bore side surface 4a on the cylinder bore 1a side and a vertical outer wall side surface 4b on the outer wall 1b side. The substantially center is formed on tapered surfaces 4c, 4c projecting downward.
Further, a standing piece 4d is formed upward from the upper surface of the partition member 4, and a hanging piece 4e is formed extending horizontally from the upper end of the standing piece 4d to the outer wall 1b side. An engagement recess 4 f is formed between the piece 4 d and the upper surface of the partition member 4.

  As shown in FIG. 10, the standing pieces 4d, the latching pieces 4e, and the engaging recesses 4f are formed to face each other at intervals in the cylinder row direction. , 4f, 4f are arranged outside the cylinders 6a, 6b, 6c, 6d as shown in FIG.

In this example, a plurality of cylinder head gaskets 3 interposed between the lower surface of the cylinder head 2 and the upper surface of the cylinder block 1 are formed at predetermined intervals in the cylinder row direction as shown in FIGS. A plurality of through holes 3a penetrating vertically are formed between the bolt holes 3c, 3c through which the cylinder head bolts are passed. A separate holding member 7 is inserted into each through hole 3a, and a plurality of through holes 3a are inserted from the cylinder head gasket 3. The holding member 7 can be provided downward.
Each holding member 7 is formed in a U-shape, and an upper end abutting portion 7a is integrally formed substantially horizontally at the upper end of the vertical vertical portion 7c, and an upper end abutting portion 7a is formed at the lower end of the vertical portion 7c. A parallel lower end engaging portion 7b is formed.

As shown in FIGS. 5 and 7, the holding member 7 passes the vertical portion 7 c through the through hole 3 a of the cylinder head gasket 3, and the upper end contact portion 7 a is in contact with the upper surface of the cylinder head gasket 3. In this state, the upper end contact portion 7a protrudes upward from the upper surface of the cylinder head gasket by about 3 mm corresponding to its thickness.
In this state, the lower end engaging portion 7b of the holding member 7 is engaged in the engaging recess 4f of the partition member 4, and the partition member 4 can be held at the lower end of the holding member 7. In such a state, the cylinder The partition member 4 can be inserted and assembled into the water jacket 5 from the upper surface side of the block 1.
Since the bottom surface of the partition member 4 is formed with tapered surfaces 4c and 4c on the cylinder bore 1a side and the outer wall 1b side, respectively, the partition member 4 can be smoothly inserted into the water jacket 5. Is easy.

  As shown in FIGS. 5 and 7, when the lower surface of the cylinder head 2 is subsequently brought into contact with the upper surface of the cylinder head gasket 3, the lower surface of the cylinder head 2 is brought into contact with the upper end contact portion 7 a of the holding member 7. When the cylinder head 2 is fixed to the cylinder block 1 with the cylinder head bolt, the lower end engaging portion 7b of the holding member 7 is in contact with the upper surface and presses the holding member 7 downward. It will be surely arranged at a predetermined height position (5 to 20 mm). That is, the partition member 4 is securely disposed in the water jacket 5 5 to 20 mm below the upper surface of the cylinder block, and the water jacket 5 is partitioned into the water jacket upper portion 5a and the water jacket lower portion 5b by the partition member 4. It can be done.

In the state of FIG. 5, the bore side surface 4a of the partition member is in contact with the wall surface of the cylinder bore 1a, and the outer wall side surface 4b of the partition member 4 is in contact with the inner wall of the outer wall 1b.
The plurality of holding members 7 are provided between the bolt holes 3c and 3c arranged in the cylinder row direction (also between the bolt holes 2d and 2d of the cylinder head and between the bolt holes 1c and 1c of the cylinder block 1). Since the cylinders 6a, 6b, 6c, and 6d are arranged on the outer peripheral side, the partition member 4 can be evenly supported by the plurality of holding members 7 and 7, and the shape before insertion into the water jacket 5 is achieved. Becomes stable, and the operation of inserting the partition member into the water jacket 5 is facilitated.

In FIG. 6, the main portion in a state where the lower end engaging portion 7 b of the holding member 7 is engaged with the engaging recess 4 f of the partition member and the partition member 4 is mounted in the water jacket 5 from above in this state. An enlarged plan view is shown.
FIG. 6 shows a state in which the above-described communication gap S is formed in the vertical direction between the bore recess 1aa of the cylinder bore 1a between the cylinders and the inner periphery of the partition member 4.

  It is controlled that a larger amount of cooling water flows in the flow path formed by the water jacket upper portion 5a than in the flow path formed by the water jacket lower portion 5b. By flowing, the upper part of the cylinder bore 1a corresponding to the water jacket upper part 5a close to the combustion chamber can be cooled satisfactorily, and distortion is generated so as not to cause a temperature difference between the upper part and the lower part of the cylinder bore 1a. It can be prevented.

Further, since communication gaps S, S, S for communicating the water jacket upper part 5a and the water jacket lower part 5b are formed at positions between the cylinders 6a, 6b, 6c, 6d, The cold water in the jacket lower part 5b can be guided to the water jacket upper part 5a which becomes high temperature, and the cooling performance is further improved.
Since the communication gaps S, S, S are formed, air can be vented well when cooling water is poured into the water jacket 5, and the communication gap S also functions as an air vent. It is something that can be done.

FIG. 8 is a bottom view of the cylinder head 2, and a plurality of holes 2 c communicating with the water jacket in the cylinder head 2 are opened in the lower surface of the cylinder head 2. In the present embodiment, since the holding member 7 is fixed by sandwiching the upper end contact portion 7a of the holding member 7 between the lower surface of the cylinder head 2 and the upper surface of the cylinder head gasket 3, avoid the formation position of the hole 2c. It is necessary to dispose the holding member 7.
Further, when the upper end abutting portion 7a hits the cylinder bore 1a or the outer wall 1b of the cylinder block 1, the sealing performance of the cylinder head gasket 3 is deteriorated. is there.
In the figure, 2d is a bolt hole on the cylinder head side corresponding to the bolt hole 1c on the cylinder block 1 side, 2a is an intake port, and 2b is an exhaust port.

It is the schematic which shows the effect | action of the cooling device of a water cooling type internal combustion engine. It is a plane arrangement block diagram in the state where the cylinder head gasket was arranged on the upper surface of the cylinder block. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line BB in FIG. 2. It is a principal part enlarged block diagram of FIG. It is a principal part enlarged plan block diagram of FIG. It is operation | work explanatory drawing of the state which inserts the support member hold | maintained at the cylinder head gasket in a water jacket. It is a bottom view of a cylinder head. It is a top view of a cylinder head gasket. It is a top view of a partition member. It is a top view of a cylinder block.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder block 1a Cylinder bore 1aa Bore recessed part 1b Outer wall 1c Bolt hole 2 Cylinder head 3 Cylinder head gasket 3a Through hole 3c Bolt hole 4 Partition member 4a Bore side face 4b Outer wall side face 4c Tapered surface 4d Standing piece 4e Engaging recessed part 4f Water jacket 5a Water jacket upper part 5b Water jacket lower part 6a, 6b, 6c, 6d Cylinder 7 Holding member 7a Upper end contact part 7b Lower end engagement part 7c Vertical part S Communication gap

Claims (5)

A water-cooled internal combustion engine in which a partition member for partitioning the water jacket around the cylinder bore into an upper part and a lower part is provided, and a larger amount of cooling water flows through the upper part of the water jacket divided by the partition member than the lower part of the water jacket. In the engine cooling system,
The partition member is composed of an elastic body that can be inserted into a water jacket,
A cooling apparatus for a water-cooled internal combustion engine, wherein the partition member is held by a separate holding member provided downward from a cylinder head gasket interposed between the cylinder block and the cylinder head.   2. The water cooling according to claim 1, wherein the holding member has a U shape, an upper end of the holding member is in contact with a lower surface of the cylinder head, and the partition member is held at a predetermined height position in the water jacket by the lower end. Cooling device for internal combustion engine.   In the state where the partition member is inserted in the water jacket, a communication gap for communicating the upper portion of the water jacket and the lower portion of the water jacket is formed at a position between the cylinders in the cylinder row direction. The cooling device for a water-cooled internal combustion engine according to claim 1.   The cooling device for a water-cooled internal combustion engine according to claim 1 or 2, wherein a plurality of the holding members are arranged between cylinder head bolts arranged in the cylinder row direction.   2. A substantially horizontal engaging portion is formed at a lower end of the holding member, and an engaging recess into which the engaging portion is engaged is formed in the partition member. Alternatively, the cooling apparatus for a water-cooled internal combustion engine according to claim 2, claim 3, or claim 4.

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