JPS6347632Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a cylinder block having a cylinder wall between the cylinder bores, in which coolant passage members communicating with water jackets provided on both sides of the bore are cast in the cylinder wall between the cylinder bores. The present invention relates to a cylinder block intermediate body for manufacturing a cylinder block designed to cool a bore portion located in a cylinder wall portion between two cylinder blocks.

In a cylinder block with a cylinder wall between the cylinder bores, the cooling effect of the bore located in the cylinder wall between the cylinder bores is poor.
Cylinder blocks in which a pipe is cast into the cylinder wall between the cylinder bores to serve as a passage for cooling fluid have already been proposed in order to increase the cooling effect of that part (Japanese Patent Publication No. 49-29966, Japanese Patent Publication No. 42744-1982). reference). However, in the case of conventional technology,
Since the pipe was cast with both ends open, sand got into the pipe during casting, making it difficult to remove the sand after casting.

It is also possible to drill holes in the cylinder wall between the cylinder bores from the side wall of the cylinder block after casting, but this poses problems in terms of sealing, as the holes drilled in the side wall of the cylinder block must be plugged. This is not possible in cylinder blocks that have bolt bosses between the cylinder bores.

The present invention was made for the purpose of solving the above-mentioned drawbacks of the conventional cylinder block in which a coolant passage member, which serves as a coolant passage, is cast into the cylinder wall between the cylinder bores. In a cylinder block having a cylinder wall therebetween, a coolant passage member closed at both ends is cast into the cylinder wall between the cylinder bores with each end protruding into a water jacket provided on both sides of the bore. A cylinder block intermediate is provided.

After casting, a hole is drilled at each end of the coolant passage member protruding into the water jacket from the top surface of the cylinder block, or by notching each end, a water jacket is formed on the cylinder wall between the cylinder bores. A communicating coolant passage is formed. Also, when holes are drilled into each end of the coolant member or when each end is cut out, the holes formed in the top surface of the cylinder block can be used as passages for the coolant to the cylinder head.

As described above, according to the present invention, both ends of the coolant passage member cast into the cylinder wall between the cylinder bores are closed during casting, so the inconvenience of sand or the like getting into the coolant passage member during casting is completely eliminated. Ru.

The coolant passage member may be a pipe whose both ends are crushed and closed, or a pipe whose both ends are closed in advance, and its cross-sectional shape may be either circular or square. A plurality of these pipes are then cast along the cylinder wall between the cylinder bores. Moreover, instead of casting a plurality of such pipes, only one relatively wide hollow body may be cast along the cylinder wall between the cylinder bores.

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

FIG. 1 shows a part of cylinder block 1, and 2
is a side wall of the cylinder block, which in this example has a bolt boss 3 between the cylinder bores 4, 4. 4 is a cylinder bore, 5 is a cylinder wall between the cylinder bores 4, and 6 is a water jacket. In the cylinder wall 5 between the cylinder bores 4, 4, a coolant passage member 7, which is closed at both ends, connects each end to the cylinder bores 4, 4.
A plurality of pieces are cast into the water jackets 6, 6 provided on both sides of the water jacket so as to protrude from the water jackets 6, 6. The coolant passage member 7 is a pipe 7A with both ends crushed and closed as shown in FIG. 2A, or a pipe 7B with both ends closed in advance as shown in FIG. 2B.
The cross-sectional shape may be either circular or square. Also, instead of casting a plurality of pipes 7A or 7B, only one relatively wide hollow body with both ends closed may be cast. In order to cast such a coolant passage member 7, it is sufficient to embed the coolant passage member 7 in core sand when manufacturing a water jacket core.

After casting, as shown in FIG. 3A, a coolant passage member 7 protruding from the top surface of the cylinder block 1 into the water jackets 6, 6 is drilled using a drill D.
Either make a hole in each end 7a, 7a of the
As shown in Figure B, each end 7 of the coolant passage member 7
Cut out a and 7a. Thereby, the coolant passage member 7 communicates with the water jackets 6, 6, and the coolant circulates through the coolant passage member 7, so that the portions of the cylinder bores 4, 4 located on the cylinder wall 5 are also well cooled. Also, use a drill to drill the coolant passage member 7.
The holes 1a formed in the upper surface of the cylinder block 1 when drilling or notching each end 7a, 7a can be used as a passage for cooling fluid to the cylinder head.

As explained above, according to the present invention, sand or the like does not get into the coolant passage member when the coolant passage member is cast into the cylinder wall between the cylinder bores, and the coolant passage protruding into the water jacket is prevented from entering the coolant passage member. The holes formed in the top surface of the cylinder block when holes are drilled or cut out at each end of the member also serve as passages for cooling fluid to the cylinder head, allowing efficient casting of the cylinder head. Furthermore, it is also possible to implement the present invention in a cylinder block having a bolt boss between the cylinder bores.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a cylinder block according to an embodiment of the present invention. FIGS. 2A and 2B are longitudinal sectional views showing an example of a coolant passage member used in an embodiment of the present invention. 3A and 3B are sectional views taken along the line A--A in FIG. 1, showing a manner in which a hole is drilled or the end of the coolant passage member is cut out using a drill. 1... Cylinder block, 2... Cylinder block side wall, 3... Bolt boss, 4... Cylinder bore, 5... Cylinder wall between cylinder bores, 6...
Water jacket, 7...coolant passage member,
D...Drill.

Claims (1)

[Scope of utility model registration request] In a cylinder block having a cylinder wall between cylinder bores, a coolant passage member with both ends closed is cast in the cylinder wall between the cylinder bores so that each end thereof projects into a water jacket provided on both sides of the bore. An intermediate material for cylinder blocks, which is characterized by the fact that: