JP2001132534A - Cylinder block provided with cooling water jacket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylinder block provided with a cooling water jacket capable of eliminating a process for removing a filler of a cavity part. SOLUTION: In the cylinder block provided with the cooling water jacket molded by insert casting an insert member, a hollow reinforcing member is inserted into the inserting member to be insert molded. The reinforcing member is formed of a pipe having a communicating hole. A plate member having the communicating hole is molded into a pipe shape, and thereby, the reinforcing member is molded. The plate member is spirally molded, so that the reinforcing member is formed. The reinforcing member is formed with a single member of a hollow shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine having a cylinder block provided with a cooling water jacket.

[0002]

2. Description of the Related Art A cooling water passage (cooling water jacket) in a cylinder block of an internal combustion engine has conventionally been made of an aluminum die-cast die. A mold corresponding to the cooling water jacket is made by aluminum die-casting, and a cavity is formed in this mold in advance for water to be cast. However, since the hollow portion is crushed by the casting pressure by itself, the hollow portion is filled with sand or shot balls as a countermeasure, and these fillers are removed after casting. However, considerable care must be taken to sufficiently fill the cavity with a filler such as sand. If the filling is insufficient, the strength may be uneven.

[0003]

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a cylinder block having a cooling water jacket which can omit a step of removing a filling material in a hollow portion.

[0004]

According to a first aspect of the present invention, there is provided a cylinder block having a cooling water jacket formed by casting an insert member therein. The members were inserted and cast and molded. In the invention of claim 2, in the invention of claim 1, the reinforcing member is formed of a pipe having a communication hole. According to a third aspect of the present invention, in the third aspect, the reinforcing member is formed by forming a plate member having a communication hole into a pipe shape. According to a fourth aspect of the present invention, in the second aspect, the reinforcing member is formed by forming the plate member into a spiral shape. In the invention of claim 5, claim 2
In the invention, the reinforcing member is formed of a single hollow member.

[0005]

FIG. 1 is a schematic vertical sectional front view of a cylinder block 100 of an internal combustion engine common to the first to fifth aspects of the present invention. In FIG. 1, a cylinder block 100 is shown.
The cooling water jacket 5 in which an insert member 4 to be described later is inserted surrounds the periphery of the cylinder block 1.

In the cylinder block 100 after casting, cooling water is supplied to the cooling water jacket 5 from the lower part by the pump 3, and the cooling water is supplied to the inside of the insert member 4 in the cooling water jacket 5 or to the cooling water jacket. Absorbs the heat of the cylinder block 1 while passing between 5,
The cooling water is sent from the upper part of the cooling water jacket 5 through the cylinder head 2 to the radiator 6 from the cooling water outlet to be cooled, and is again supplied into the cooling water jacket 5 by the pump 3.

(Embodiments of the Inventions of Claims 1 and 2) FIG.
Cylinder block 1 according to the first and second aspects of the invention
FIG. 2 is a plan view of an insert member 4 inserted into the internal member 00 (FIG. 1). FIG. 3 is a sectional view taken along line III-III of FIG.

As shown in FIGS. 2 and 3, the insert member 4 has an annular groove 7 with a bottom on the periphery, and the inside is hollow. In the annular groove 7 of the insert member 4, a hollow and annular reinforcing member 8 having a thickness and rigidity which is concentric with the annular groove 7 and can be stored in the annular groove 7 is provided at the bottom 7 of the annular groove 7.
a (FIG. 3) to the opening 7b (FIG. 3). The reinforcing member 8 has a hollow portion 8a (FIG. 3).
It is formed by bending a pipe material having a circular shape. After inserting the reinforcing member 8 into the annular groove 7, the annular lid 10 shown in FIG. 3 is fitted into the opening 7 b of the annular groove 7.

The left side of the dashed line in FIG. 1 shows the virtual shape of the cylinder block 100 in which the insert member 4 in the cooling water jacket 5 is not crushed after casting. The right side of the dashed line in FIG. 1 shows the actual shape of the cylinder block 100 after casting. Although the cooling water jacket 5 slightly crushes the recessed portion between the adjacent reinforcing members 8 together with the insert member 4, a sufficient space for passing the cooling water is secured in the cooling water jacket 5. . The cover 10 fitted on the upper part of the insert member 4 has a hole 10a for allowing a necessary amount of water to flow in a necessary place in advance.
Are provided at a plurality of locations (only one of them is shown in FIG. 1), and cooling water flows to the cylinder head portion 2 through the holes 10a.

The cooling water jacket 5 shown in FIG. 1 is molded around the outer periphery of the cylinder block 1 with the outer shape of the insert member 4 as a boundary. The cooling water jacket 5 is formed by pressure during casting as shown on the right side of FIG. The cooling water is stored in the cooling water jacket 5,
Alternatively, the cylinder block 1 can be cooled.

Here, as shown in FIG. 2, a plurality of holes 9 are provided in the reinforcing member 8, and each hollow portion 8a of the adjacent reinforcing member 8 is provided.
(FIG. 3), and the cooling water supplied by the pump 3 of FIG. 1 passes through the hole 9 (FIG. 2) and the hollow portion 8a (FIG. 3) of the reinforcing member 8 in the insert member 4 and the cylinder head. It can also be made to flow to the section 2. The insert member 4 is formed of, for example, an easily processable metal such as aluminum, and the reinforcing member 8 can be, for example, a steel pipe.

(Embodiment 3) An example of a method of manufacturing the reinforcing member 8 will be described. FIG. 4A shows the reinforcing member 8.
It is a front view of the flat plate 11 which is a raw material. In the elongated flat plate 11 shown in FIG. 4A, a plurality of holes 11a are provided in two rows in the longitudinal direction of the flat plate 11.

As shown by arrow A, this flat plate 11
1b and 11c are curved so as to face each other to form a pipe 12 as shown in FIG. 4B. The pipe 12 is further curved in an annular shape so that the ends 12a and 12b of the pipe 12 face each other as shown by an arrow B, thereby forming an annular hollow reinforcing member 8 as shown in FIG.

FIG. 5A is a front view of a flat plate 13 which is another raw material of the reinforcing member 8. Flat plate 1 shown in FIG.
The holes 3 are staggered in 3. This flat plate 13 is curved as shown by the arrow C in the same manner as the flat plate 12 of FIG. 4A to form a mesh pipe 15 shown in FIG. 5B.
Further, as shown in FIG. 5C, the mesh pipe 15 is curved in a ring shape as shown by the arrow D to form the reinforcing member 8.

FIG. 6A is a front view of a flat plate 16 which is another raw material of the reinforcing member 8. In the flat plate 16 of FIG. 6A, square holes 17 are regularly arranged vertically and horizontally. The flat plate 16 is bent as shown by the arrow E to form the pipe 18 shown in FIG. 6B, and then bent in a ring shape to form the reinforcing member 8 (not shown).

FIG. 11 shows that the annular groove 7 of the insert member 4 has the pipe 1 shown in FIGS. 4 (b), 5 (b) and 6 (b).
FIG. 2 is a plan view showing a state in which the mesh pipe 15 and the pipe 18 are inserted in a straight shape. In this case, the trouble of bending the pipe 12 and the like can be omitted, and the working process can be simplified.

(Embodiment of Claim 4) FIG. 7 (a)
FIG. 9 is a front view of a flat plate 19 which is a raw material for forming the reinforcing member 8 by a method different from the embodiment of the third aspect of the present invention. The flat plate 19 is spirally curved along the side surface of the cylinder to form a spiral member 20 as shown in FIG.
The reinforcing member 8 (not shown) is formed by bending the spiral member 20 in an annular shape. As shown in FIG. 11 described above, the spiral member 20 of FIG. 7B may be inserted into the insert member 4 in a state where the spiral member 20 is not curved but remains straight.

FIG. 8 is an exploded perspective view of a reinforcing member 21 according to the fifth aspect of the present invention. FIG. 9 is a partial longitudinal sectional view of the cooling water jacket 5 in a state where the reinforcing member 21 is inserted in the cooling water jacket 5.

The insert member 4 has the same structure as the above-described insert member 4, but the reinforcing member 21 has an integral structure from the bottom 7a of the annular groove 7 (FIG. 1) of the insert member 4 to the opening 7b. This is different from the reinforcing member 8 in each of the above embodiments in the point.

To facilitate understanding of the structure of the annular reinforcing member 21 inserted in the cooling water jacket 5 in FIG. 9, the annular reinforcing member 21 is shown open in a plane in FIG. In FIG. 8, the reinforcing member 21 is formed by bending a single flat plate at two locations, overlapping both ends, providing a step in the joint portion 22 in a key shape, and receiving the other end. By performing the joining method like the joining portion 22, the unevenness of the joining portion can be accommodated in the hollow portion 23 of the reinforcing member 21 as shown in FIG. 9, and the reinforcing member 21 is inserted into the insert member 4. It will be easier.

As shown in FIG. 8, a hole 24 and a hole 25 (FIG. 9) are provided in the folded portion of the flat plate. This hole 2
Numerals 4 and 25 are an inlet and an outlet of the cooling water as shown in FIG. End 21 of reinforcing member 21 configured as shown in FIG.
a and 21 b are curved in an annular shape so as to face each other and inserted into the cooling water jacket 5.

The reinforcing member 21 is made of a material such as steel, for example, and can be formed by deep drawing using an annular groove form having the same shape as the annular groove 7 of the cooling water jacket 5.

If the reinforcing member 21 has a problem in strength, a rib 26 may be arranged in the hollow portion 23 as shown in FIG. The rib 26 is disposed in the hollow portion 23 before deep drawing of the upper folded portion 27 shown in FIG. Although not shown, it is preferable to provide a hole in the rib 26 so that the cooling water can easily pass therethrough.

[0024]

According to the first aspect of the present invention, the insert member 4
By inserting the hollow reinforcing member 8 into the interior of the cooling water jacket 5, it is possible to prevent the space in the cooling water jacket 5 from being crushed by the pressure during casting.

In addition, the following effects can be achieved by not using padding such as sand and shot balls in the cooling water jacket 5 as in the prior art.

By using the hollow reinforcing member 8, the operation of removing the padding after casting can be omitted, and the efficiency of the operation can be increased.

Since no filling is used, the filling does not seize during casting, and the cylinder block 100 having the cooling water jacket 5 of uniform quality can be manufactured.

It is difficult to fill an appropriate amount of padding, and if casting is performed with the amount of padding being insufficient, there is a possibility that a cooling water jacket having unevenness in strength may be produced. However, the reinforcing member 8 is used instead of the padding. Thereby, the cooling water jacket 5 having uniform strength can be manufactured.

According to the second aspect of the present invention, by using a pipe member having a hole as the reinforcing member 8, cooling water can be passed through the pipe and through the hole. Filling with water or cooling water jacket 5
The cooling water inside can be discharged.

According to the third aspect of the present invention, the communication hole (hole 11a)
The reinforcing member 8 can be formed at low cost by forming a plate member (flat plates 11, 13, 16) having the shape of a pipe.

According to the invention of claim 4, the plate member (the flat plate 19)
Can be spirally formed to form the reinforcing member 8, so that the degree of freedom can be increased when selecting the shape of the reinforcing member 8. Can be).

According to the fifth aspect of the present invention, since the reinforcing member 21 is formed of a single hollow member, the degree of freedom of the shape of the reinforcing member 21 can be increased within a range where sheet metal forming is possible. . Reinforcing member 8 according to claims 2 to 4
The flow resistance of the cooling water is lower than in the case of using the cooling water, and the cooling water is easily circulated in the cooling water jacket 5.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a cylinder block 100 of an internal combustion engine.

FIG. 2 is a plan view of an insert member inserted into the cylinder block according to the first and second aspects of the present invention.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4A is a front view of a flat plate that is a raw material of a reinforcing member. (B) is a front view of the pipe formed based on the flat plate of (a). (C) is a plan view of a reinforcing member formed by bending the pipe of (b) into an annular shape.

FIG. 5A is a front view of a flat plate that is a raw material of a reinforcing member. (B) is a front view of the mesh pipe formed based on the flat plate of (a). (C) is a plan view of a reinforcing member formed by bending the mesh pipe of (b) into an annular shape.

FIG. 6A is a front view of a flat plate that is a raw material of a reinforcing member. (B) is a front view of the pipe formed based on the flat plate of (a).

FIG. 7A is a front view of a string-shaped flat plate as a raw material of a reinforcing member. (B) is a front view of the spiral member formed based on the flat plate of (a).

FIG. 8 is an exploded perspective view of a reinforcing member inserted into a cooling water jacket used for forming a cylinder block according to the invention of claim 5;

FIG. 9 is a schematic sectional view of a cooling water jacket portion of a cylinder block according to the invention of claim 5;

FIG. 10 is a schematic sectional view showing a state in which a rib is added to the reinforcing member in FIG. 9;

FIG. 11 is a plan view showing a state where a linear reinforcing member is inserted into the insert member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Water storage part 3 Pump 4 Insert member 5 Cooling water jacket 6 Radiator 7 Annular groove 8 Reinforcement member 9,14 hole 10 Cover 11,13,16 Plate 12 Pipe 14 Hole 15 Mesh pipe 17 Hole 23 Hollow part 26 Rib 24 , 25 holes 90 combustion chamber 100 cylinder block

Claims (5)

[Claims] 1. A cylinder block provided with a cooling water jacket formed by casting and molding an insert member, wherein the cooling water jacket is formed by casting and molding by inserting a hollow reinforcing member into the insert member. Equipped cylinder block. 2. The cylinder block provided with a cooling water jacket according to claim 1, wherein the reinforcing member is formed by a pipe having a communication hole. 3. The cylinder block provided with a cooling water jacket according to claim 1, wherein the reinforcing member is formed by forming a plate member having a communication hole into a pipe shape. 4. The cylinder block provided with a cooling water jacket according to claim 1, wherein the reinforcing member is formed by shaping the plate member into a spiral shape. 5. The cylinder block provided with a cooling water jacket according to claim 1, wherein the reinforcing member comprises a single hollow member.