JPS61149548A - Cylinder block of multicylinder water-cooled engine and manufacture thereof - Google Patents

Abstract

PURPOSE:To reduce the number of cooling water intake ports and to ensure uniform circulation cooling water to each cylinder, by a method wherein a cooling water intake port, communicated to the water jacket of two cylinders, is formed in a side between adjoining cylinders. CONSTITUTION:A cooling water intake port 3, communicated with water jackets 5A and 5B of two cylinders 2A and 2B, is provided in a front side between the plural cylinders 2A and 2B formed in a cylinder block 1. The water cooling intake port 3 comprises a common passage 10, extended straightly toward the interior in an about 2-equally-dividing position between the two cylinders 2A and 2B, and branch passages 11A and 11B which are branched laterally symmetrically and obliquely from the common passage 10 and communicated with the water jackets 5A and 5B, respectively. This enables cooling water to be fed about in a laterally symmetrically uniform manner to the water jackets 5A and 5B only through formation of the cooling water intake port 3 in one spot, and permits about uniform cooling of the two cylinders 2A and 2B.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cylinder block for a multi-cylinder water-cooled ennon and a method for manufacturing the same, and in particular, to a structure of a cooling water intake port leading from the side of the cylinder block to the water jacket inside the cylinder. and related to improvements in manufacturing methods.

[Conventional technology]

In a water-cooled engine, a cooling system is generally employed in which cooling water from a water tank is circulated through a water jacket formed in a cylinder and a cylinder head. In this case, the circulation path is usually configured as follows: water pump discharge port -> cylinder quarter jacket -> water cylinder head water jacket -> lazoator -> water pump suction port.

In the case of a cylinder block of a multi-cylinder water-cooled engine, that is, a water-cooled twin cylinder in which multiple 7 rings are formed in one block, a water jacket is formed around each cylinder, and a quarter It is necessary to supply low-temperature cooling water from a pump.

[Problems that the invention helps solve]

By the way, in the cylinder block of a conventional multi-cylinder engine, a cooling water intake port is provided for each cylinder, and cooling water from a quarter pump is fed to each cylinder via a manifold pipe.

However, in such a conventional structure, the cooling water intake must be fabricated for each cylinder, and the number of connections with the manifold pipes must be laid as many as the number of cylinders. The problem is that it is complex, requires a lot of man-hours to process and assemble, and also requires a considerable amount of space.

In addition, in a two-cylinder cylinder block, one cylinder is provided with a cooling water intake in one cylinder, and the water jackets of each cylinder are connected to each other to circulate water from one water jacket to the other. However, this type of structure often had the problem of not being able to cool it uniformly.

〔the purpose〕

The present invention was completed in view of the above problems, and is capable of reducing the number of cooling water intakes in a multi-cylinder cylinder block, ensuring uniform circulation of cooling water to each cylinder, and furthermore, It is an object of the present invention to provide a cylinder block for a multi-cylinder water-cooled engine that can be easily manufactured without requiring an extra core or the like, and a method for manufacturing the cylinder block.

[Ninth way to solve the problem]

The present invention reduces the number of cooling water intakes (from 2 to 1 in the case of two cylinders) and reduces the number of cooling water intakes by providing cooling water intakes that communicate with the water jackets of both cylinders on the side surfaces between adjacent cylinders. The purpose is to achieve uniform cooling of the air, thereby achieving the above objective.

Further, the present invention (second invention) relates to a manufacturing method that allows the cylinder block to be easily cast without increasing the number of cores, etc., in which a cooling water intake port is provided in the mother mold on the side surface between adjacent cylinders. An inward protrusion for molding the inner cavity of each cylinder is provided, and an outward protrusion having mating surfaces with both sides of the inward protrusion is provided on each core for molding each cylinder inner cavity, and these mother molds and the core The mold removal of the mating surface of the casting product obtained using the method is carried out simultaneously with the inner diameter machining of the cooling water intake by machining through the inner diameter, and thereby,
The present invention provides a method for manufacturing a cylinder block, characterized in that a cooling water intake port communicating with the water jackets of both cylinders is formed.

〔Example〕

Hereinafter, the present invention will be specifically explained with reference to the drawings.

FIG. 1 shows a plane of a cylinder block of a multi-cylinder water-cooled engine according to an embodiment, and FIG. 2 shows a front side of FIG. 1,
FIG. 3 shows a longitudinal section taken along the line 1--Rin in FIG.

In FIGS. 1 to 3, two Ir1 7 rings (cylinder cavities) 2A, 2B are formed in the illustrated cylinder block 1, and the front side surface between both cylinders 2A, 2B is provided with water of both cylinders 2A, 2B. A cooling water intake 3 leading to the jacket is formed.

The cylinder block l is manufactured by molding by aluminum casting or the like and then machining the required parts, and each cylinder cavity 2A, 2B is provided with a cylinder liner 4A as shown by the chain double-dashed line in FIGS. 1 and 3. The water jackets SA and 5B (FIG. 3) are formed around the outer periphery of the cylinder liners 4A and 4B by press-fitting the cylinder liners 4B and the like. The seven reinodar liners 4A and 4B are made of iron, for example.

In addition, the cylinder head is fastened to the upper surface 6 of the cylinder frying wheel, and the lower surface 7 is fastened to the crankcase, and these fastenings are formed (usually by drilling) at desired locations (6 locations in total in the illustrated example). This is done through the melt hole 8. , and an O-ring groove 9A at the bottom of each cylinder 2A, 2B.

9B are formed, and these Q IJ grooves 9A.

The watertightness of the quarterno jackets 5A, 5B is maintained by pressing an O-ring (not shown) inserted into the liner 9B to the outer peripheral surface of the 7-ring liners 4A, 4B.

4 shows a cross section along the line w-pt in FIG. 2, and FIG. 5 shows a cross section along the line V-V in FIG. 4, each of which shows the internal structure of the cooling water intake 3. shows.

In FIG. 4 and FIG. 5 Gζ, the cooling water intake 3
is formed between both cylinders 2A and 2B, and between the cylinders 2A and 2B is a common passage 10 that goes straight inward at a position equally divided by y2, and a common passage 10 that branches diagonally symmetrically from the common passage 10 to each water nozzle. It is formed by branch passages 11A and IIB leading to the containers SA and 5B.

Therefore, by simply providing the cooling water intake port 3 at one location, the cooling water pumped from a quarter pump or the like can be branched to each branch passage 11A, IIB at an equal flow rate and pressure. It is also possible to feed the water jackets 5A and 5B in a symmetrical and even manner.

In this way, both cylinders 2A and 2B can be cooled equally.

Next, a method for manufacturing the cylinder block 1 will be explained.

This cylinder block 1 is cast (molded) using a mother die (usually a metal mold) for forming the outer surface and a core (usually a felt type) for forming each cylinder 2A, 2B.

Although the general casting method using this mother die and core is well known, the present invention is characterized by the method for manufacturing (casting and post-processing) the portion of the cooling water intake 3 as described above. Therefore, casting and post-processing of the cooling water intake 30 portion will be specifically explained below.

The mother mold has an inward protrusion (tV double-point chain 11112 in FIGS. 4 and 5) for forming a common passage portion of the cooling water intake 3 on the side surface between the adjacent rings 2A and 21.
A, 12E, 13"t'f) are provided, while each cylinder 2A.

Each core forming the inner cavity of 2B is provided with an outward protrusion having mating surfaces with both sides of the inward protrusion. As shown in FIG. 4, the protrusions of the cores of the two cylinders have mating surfaces 12A, and the protrusions of the cores of cylinder 2B have mating surfaces 12B. In addition, in FIG. 2, the combination ff11 of the inward protruding portion and the outward protruding portion is shown.
2A, 12B and the front shape of the cross section 13 of the inward protrusion.

After casting using the mother mold and core having such a shape, the inner diameter 15 (see Figs. 2, 4, and 5) is expanded to the depth shown by the two-dot chain line 14 with respect to the common passage portion 1o. A hole with a circular cross section is machined.

Usually, flash is generated on the mating surfaces 12A and 12B, but in the illustrated example, the width of both mating surfaces 12A and 12B is set to be smaller than the inner diameter 15, so that the depth of the two-dot chain line 14 is smaller than the inner diameter 15. Simultaneous iζ by drilling holes
Cast flash is also removed. In this way, quarterno jacket 5
The cooling water intake port 3 leading to A and 5B can be finished into a predetermined shape only by hole machining.

In the illustrated example, the flash is removed at the same time as the inner diameter 15 is machined, but the flash may be removed in a separate step through the inner diameter 15 if necessary.

According to the embodiment described above, it is possible to obtain the cylinder block 1 which can cool two cylinders equally by providing the cooling water intake port 3 at one location. Therefore, compared to the conventional structure in which an intake port is provided for each cylinder, it is possible to reduce the number of machining steps for the intake port and the number of parts for the piping connection, and also to simplify the structure and save space. can be achieved.

When casting the cylinder block l, it is easy to cast by simply providing a protrusion on the core, and there is no need to use a complicated casting mold with an extra core.
It is also possible to reduce man-hours and mold costs.

Furthermore, post-processing of the cooling water intake can be performed in substantially the same way as conventional processing for one cylinder.
Since the number of cooling water intakes is reduced, the number of post-processing steps can also be reduced.

Although the embodiments illustrated above have been described using a two-cylinder cylinder block as an example, the present invention can be similarly applied to a cylinder block having more cylinders.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a cylinder block for a multi-cylinder water-cooled ennon can be obtained which can uniformly cool each of the seven cylinders despite reducing the number of cooling water intakes, and further , a manufacturing method is provided that allows the cylinder block to be easily manufactured without requiring an extra core.

[Brief explanation of drawings]

FIG. 1 is a plan view of a cylinder block of a multi-cylinder water-cooled engine according to an embodiment of the present invention, FIG. 2 is an IeI side view of FIG. 1, and FIG. cross-sectional view, 4th
The figure is a sectional view taken along line ■-W in figure 2, and figure 5 is a cross-sectional view taken along line
It is a sectional view taken along the line V-V in the figure. 1. Misery... cylinder block, 2A, 2B...
Cylinder, 3...Cooling water intake, 4A. 4B...Cylinder liner, 5A, 5B...
・Water jacket, 10... Common passage, 11
M, IIB...Branch passage, 12A, 12B...Mating surface, 15...Inner diameter (during machining). Agent Patent Attorney Yasushi Ooto Figure 1 2A, 2B Ninth 9th corner 3: Immediate water, intake Figure 2

Claims (2)

[Claims] (1) A cylinder block for a multi-cylinder water-cooled engine, characterized in that a cooling water intake port communicating with the water jackets of both cylinders is provided on a side surface between adjacent cylinders. (2) In a method for manufacturing a cylinder block for a multi-cylinder water-cooled engine, the mother mold is provided with an inward protrusion for forming a cooling water intake on the side surface between adjacent cylinders, and
Each core forming the inner cavity of each cylinder is provided with an outward protrusion having a mating surface with both sides of the inward protrusion, and the above-mentioned mating of the cast product obtained using these mother molds and cores is provided. A cylinder block characterized in that flash removal on the surface is performed simultaneously with machining of the inner diameter of the cooling water intake or by machining through the inner diameter, thereby forming a cooling water intake that communicates with the water jacket of each cylinder. manufacturing method.