JP2839427B2 - Castings with passages - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting such as a cylinder block having a passage.

[0002]

2. Description of the Related Art As a casting having a passage, for example, there is a water-cooled cylinder block. The cylinder block is provided with a water-cooling jacket, which is a passage between the inner wall of the cylinder and the outer wall of the block. Cooling water as a fluid circulates through the water-cooling jacket to cool the cylinder block. The passage has a long cross section so that the cooling water flows efficiently.

[0003]

However, in recent cylinder blocks, the cylinders are close to each other in order to make the cylinder linerless and compact, and the thickness between the cylinders is made thin. It has been difficult to form a communication passage having a long hole cross section using a core in the thin portion.

[0004] In view of the above problems, an object of the present invention is to provide a cast product in which a communication passage having a high flow efficiency of a fluid is formed in a thin portion.

[0005]

In order to achieve the above object, the present invention takes the following measures. That is, the feature of the present invention is that a stuffed material having a passage having an elongated cross section with both ends opened is cast into a thin portion to form a communication passage having an elongated cross section in the thin portion . For castings with passages
And the cast-in material is made of a 0.5 mm thick plate.
The width of the passage is formed to be 1 mm.
For the thin part, insert the sand into the passage and fill it
That's the point.

[0006]

In the present invention, since the cast-in-place material having the passage is integrally cast at the time of casting, the communication passage in the thin portion can be easily formed. In addition, since the cross section of the communication path is elongated, the flow efficiency of the fluid is good.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a cylinder block as an example of a casting according to the present invention. Three cylinders 1 are provided integrally on the upper part of the cylinder block, and a crank support part 2 is provided integrally on the lower part.

A water cooling jacket portion 3 is formed between the upper cylinder inner wall and the block outer wall in a substantially rectangular shape in plan view, and an intermediate portion of the water cooling jacket portion 3 is formed in a thin portion between the cylinders 1. The insert material 4 is inserted so as to be connected. The cast-in material 4 is formed by bending a thin steel plate (stainless steel material) into a substantially U-shape, and joining the free end side of the cast-in material 4 by spot welding, caulking, or the like so that the cross section becomes an elongated hole. As a result, a passage 5 having an elongated cross section with both ends opened is formed inside the cast-in material 4. This passage 5 becomes a communication passage 6 that communicates with the middle part of the water-cooled jacket 3 after casting. At both ends of the passage 5, side plates 7, which are outwardly widened in the width direction, are provided on both sides of the passage 5 so that cooling water (fluid) easily enters the passage 5.

At the time of casting, the passage 5 of the cast-in material 4 is connected to the water-cooled jacket 3 after casting.
The cast-in material 4 is set in a portion to be a thin portion between the cylinders 1. The passage 5 of the cast-in material 4 is filled with sand and cast.
U. After the casting, the cylinder block is removed from the mold, and the sand in the water cooling jacket 3 and the sand filled in the passage 5 are removed .

In the present embodiment, the thickness of the thinnest portion between the cylinders 1 is 5 mm, and the thickness of the steel
The width of the passage 5 is 1 mm. That is, a long hole-shaped communication passage 6 having a width of 1 mm is formed so as to communicate with the water cooling jacket portion 3 in a thin portion of 5 mm. According to the above configuration, since the cast-in material 4 having the passage 5 is integrally cast at the time of casting, the communication passage 6 can be easily provided in the thin portion of the cylinder block, which has been conventionally difficult.
Further, since the communication passage 6 having a long-hole cross section is formed in the thin portion so as to communicate with the water-cooling jacket portion 3, the flow efficiency of the cooling water is high, and the thin portion, which tends to be particularly high in temperature, can be efficiently cooled. .

It should be noted that the present invention is not limited to the above embodiment, and the cast-in material may be a pipe material obtained by deforming a pipe material into a flat shape, and the number of cylinders may be two or four or more. Is also good. Further, as the casting, a water-cooled cylinder head may be used instead of the cylinder block, and the invention can be applied to a casting having other passages. In the case of an air-cooled cylinder block, air serves as a fluid.

[0012]

According to the present invention, a cast-in material having a passage having an elongated cross section with both ends open is cast into a thin portion, and a communication passage having an elongated cross section is formed in the thin portion. So
A communication path can be easily formed in the thin portion, and
The fluid passing through the communication passage can be efficiently flown.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 4 Cast-in material 5 Passage 6 Communication passage

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model 1-93345 (JP, U) Japanese Utility Model 2-22254 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) B22D 19/00

Claims (1)

(57) [Claims] 1. A cast product having a passage in which a cast-in material having a passage having an elongated cross section open at both ends is cast into a thin portion and a communication passage having an elongated cross section is formed in the thin portion.
The cast-in material has a passage width of 0.5 mm in thickness.
Is formed to a thickness of 1 mm.
So that the passage is filled with sand in the passage
A casting having a passage characterized by the following.