JPS6094230A - Method of manufacturing cylinder block - Google Patents

Abstract

PURPOSE:To facilitate the manufacturing of a cylinder block to enhance the productivity thereof, by integrally fitting, in a cylinder block member, a member in which cylinder liners of the number corresponding to the number of engine cylinders are integrally incorporated by means of a plurality of substantially continuous ring-like connecting members which are vertically spaced. CONSTITUTION:Upon manufacturing of a cylinder block, top, middle and bottom substantially continuous ring-like connecting blanks 4' through 6' made of steel plates are prepared, and a steel cylinder liner 3 is fitted into cylinder liner fitting bores 4'a through 6'a, and is welded to the latter to obtain an integral member. Then the profile surface of the connecting blanks 4', 6' are cut into predetermined shapes to complete a cylinder bore block 1. Meanwhile, after a cylinder block blank 2' having bore recess 7, bolt holes and cooling water channel holes i cast, the fitting sections of the connecting member 4 through 6 are cut so that stepped parts 11, 12 are obtained. Then the above-mentioned bore block 1 is cooled while the cylinder block blank 2 is heated so that both are fitted together, and thereafter, bolts which are screwed into the above-mentioned bolt holes are fastened to complete a cylinder block.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a cylinder bore block having a plurality of bores formed separately from the cylinder bore block.

An IJ printer configured to be housed and fixed within a block body.

Relating to a method of manufacturing blocks.

(Prior art) Recently, as part of efforts to reduce the weight of vehicle engines, there has been a trend towards making the cylinder block itself from aluminum chestnuts, and there is a tendency for cylinder blocks to change from iron to aluminum. Due to the size of the engine, it is easy to cast an iron liner, but as the engine becomes larger than a medium-sized engine, this relationship becomes less proportional, and it becomes difficult to fix the iron liner, requiring a large wall thickness. This has the problem of being of excessive quality. In addition, using aluminum for part of the liner has inherent problems such as consistency in phase properties and other complications, and the reality is that it cannot be widely put into practical use. In addition, the coefficient of thermal expansion of aluminum is approximately twice that of iron, and the structure around the bore is
It is basically inferior to iron-based materials. Therefore, it cannot be used as a substitute for iron-based cylinder blocks, which have a small coefficient of thermal expansion and excellent properties against piston sliding surfaces.

Therefore, the inventor of the present invention has recently developed an iron-based cylinder bore block that has bores for the number of cylinders, taking into account the piston's sliding surface characteristics, and has attempted to reduce the weight of the cylinder block by accommodating and supporting this cylinder bore block. We have developed a cylinder block consisting of a cast cylinder block body made of aluminum material.

The above-mentioned cylinder bore block has a structure in which cylinder liners for the number of cylinders forming the bore are lined up and integrated using a pair of connecting bodies in order to reduce the distance between adjacent bores and make the cylinder block itself more compact. There is. This integration was achieved by welding together the upper and lower steel plate connecting bodies in which the holes into which each cylinder liner was inserted were lined up in the same number of meters, and the cylinder liners that were inserted into the holes of the six connected bodies. was.

The contour surface shape of these connecting bodies is usually a concave that faces inwardly and symmetrically with the large diameter arc around each cylinder liner due to the relationship with the tension bolt holes provided between each adjacent cylinder in the cylinder block body. It has a connected ring shape consisting of joints connecting adjacent large-diameter circular arc parts made of arc contours, but this surface has conventionally been milled by an operator.

For this reason, there is a problem in that the profile of the connected body cannot be made homogeneous depending on the skill level of the operator or the conditions at the time of processing. This also applies when cutting the endless step formed on the cylinder block main body side that fits and supports the connecting body, that is, the surface that forms the bore hole recess that accommodates the cylinder bore block. I can say that.

In this way, if there is an error between the connecting body of the cylinder bore block and the stepped part of the cylinder block body into which it is fitted, it is necessary to fit them together to firmly integrate them1^). There is a problem in that if the connecting body and the step part do not fit closely together or do not come into close contact with each other when they are fitted, the connecting body and the step part cannot maintain their watertight properties.

(Object of the Invention) The present invention is intended to solve the above problem, and is to connect the connecting body of the cylinder bore block to the j+ of the cylinder block body.
It is an object of the present invention to provide a method for manufacturing a cylinder block having a structure in which the parts are integrally integrated with each other while maintaining constant and watertightness.

(Structure of the invention) In order to achieve such object, the present invention Jj method (d.

Cylinder liners for the number of cylinders are integrated by connecting at least the earth part and lower part of each cylinder liner in the form of one line. The contour surface of the l1IT contact body is cut by numerical control into a shape that can be press-fitted by temperature difference fitting so that the size of the contour of the upper connecting body is larger than the size of the contour of the lower connecting body, and the number of cylinders is Create a cylinder bore block with an integrated structure of the 7/7 ring liner and at least the upper and lower connecting bodies,
In a separate process from the manufacturing process of the cylinder bore block, a cylinder block body having a bore hole recess for accommodating the cylinder bore block with a gap is cast, and then the upper and lower parts of the bore hole recess forming surface of the cylinder block body are numerically controlled. The cylinder bore block is assembled to the cylinder block body by cutting to create an endless step that matches the contour of the upper and lower connecting bodies, and press-fitting the upper and lower connecting bodies into the corresponding steps by temperature difference fitting. It is characterized by

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a cylinder block manufactured using the method of the present invention. In FIGS. 1 and 2, 1 is a cylinder bore block having bores corresponding to the number of cylinders, and 2 is a cylinder block main body in which the cylinder bore plot 1 is housed and protected. The cylinder bore block 1 is constructed by integrating steel cylinder liners 5 corresponding to the number of cylinders forming each bore through annular upper, middle, and lower steel plate connecting bodies 4, 5, and 6. On the other hand, the cylinder block main body 2 is cast from aluminum in order to reduce the weight of the cylinder block itself, and has a bore hole recess 7 with a capacity that can accommodate the entire cylinder bore block 1 with a gap, and a tension for connecting the cylinder head. It is equipped with a tensilon port hole 8 into which the port is screwed together, and in addition, water is provided on the outer surface of each cylinder liner 6, the surface forming the bore hole recess 7, and the water jacket 9 formed by being surrounded by the upper and lower connecting bodies 4 and 6. JL (+iji L)
There is C.

This cylinder block body 2 is the famous cylinder liner 5
The lower part of each hole 7aK, which is drilled for the number of cylinders at a predetermined interval at the bottom of the bore hole recess 7, is press-fitted with a differential fit. 11,
By press-fitting the connecting bodies 4 and 6 into 12 by temperature difference fitting,
It supports the cylinder bore block 1.

To manufacture a cylinder block with such a configuration,
First, as shown in Figure 3, the upper, middle, and lower parts of the steel are roughly connected to each other before contour surface processing! Rough connecting body 4' made by fi, da.

6′ are prepared, and the respective connectors 4/ , s/ ,
A steel cylinder liner 3 is press-fitted by temperature difference fitting into each of the cylinder liner fitting holes 4/a, 5/a, and 6/a, which were arranged in a row and drilled for the number of cylinders in 6/, and each fitting part is spot-fitted. Then, it is integrated with the cylinder liner 5 by beam welding (the welded portion is shown as a black area in FIGS. 1 to 5). In addition, the upper, middle and lower coarse connecting bodies 4', ”/,
The size of the contour of the cylinder block body 2 is gradually reduced so that it can be easily inserted into the bore hole recess 7 of the cylinder block body 2.

Also, if necessary, perform trapping, annealing, shot peening,
Antirust plating may be applied. In Figures 1 to 5, 1
3 is a cooling water hole.

After that, the ancestor clitic 4', 6' (if desired, the difference clitic 5')
The contour surface of (m) is cut using a commonly used numerically controlled milling machine. Cutting is performed on the large-diameter arc portion of the three circumferences of each adjacent cylinder liner. , (see Figure 1)
They are connected by an inwardly concave small-diameter arc part r (see Figure 1) that forms the outline of the joint, and are inflected on a straight line connecting the center of the large-diameter arc part R and the center of the small-diameter arc part r. Adjustments are made using the adjustment scale 1 so that the points are located. In the connecting body 4 shown in FIGS. 1 and 2 which has been cut, the radius of the large diameter circular arc portion R of the connecting body 4 is now R6 and the small diameter circular arc i7B.
If the radius of r is r4, the radius of the large-diameter arc portion R of the connecting body 60 is the peak, and the radius of the small-diameter arc portion r is r6, then R is R.
6 and r4 is smaller than r6. It goes without saying that the numerically controlled cutting of the connecting bodies 4/ and b/ of the cylinder liner 3 may be performed before the cylinder liner 3 is inserted and integrated.

Even after this cutting process, the connecting bodies 4, 5 (5'l
.

The size of the outline of 6 is 1r, which is smaller than l1ifi.

Apart from the manufacturing process of the cylinder bore block 1 mentioned above, the rough cylinder block main body 2' is prepared by cutting the machining allowances corresponding to the trap, the bore hole recess 7 and the stepped portions 11 and 12 after machining, as shown in FIG. Although not shown, it is cast in a shape provided with tension port holes 8 and cooling channel holes 1Ly. 1. After that, the machining allowance parts 11' and 12' are adjusted so that the connecting body 4.6 of the cylinder bore block 1 can be press-fitted with a temperature difference fit, that is, the difference between the usage environment conditions (maximum) for the temperature difference fit press-fit plus the machining error. In order to generate residual stress between the mating pressure surfaces when mating, numerically controlled cutting is performed using a numerically controlled milling machine to form steps 11 and 12 in accordance with the contour surface of the connecting body 4.6. do.

Then, the cylinder bore block 1 formed by cutting the connecting body 4.6 is cooled, and the cylinder block main body 2 formed by actual cutting is heated, so that the connecting body 4 is formed into the stepped portion 11, and the connected body 6 is formed into the stepped portion. 12, and by press-fitting the lower part of each cylinder liner 6 into the hole 7a of the bore hole recess 7 by temperature difference fitting and supporting it closely, the connecting body 4 and the step 11 and the connecting body 6 and the step 12 are connected. Maintains aqueous properties. Then, if desired, the upper surfaces of the cylinder bore block 1 and the cylinder block body 2 are machined in one direction (IJ), and the cylinder head and the cylinder block body 2 are passed through the gasket from the cylinder head side to each tension of the cylinder block body 2. They are integrated by tightening a tension bolt screwed into the bolt hole 8.

In the above embodiment, the connecting body 5 at the center of the cylinder bore glock 1 is provided for reinforcement, but this is not necessarily intended to be rigid. If desired, with the cylinder bore block 1 inserted into the four bore holes 7 of the cylinder block body 2, an endless fitting protruding stepped portion is formed at the location where the connecting body 5 is located. Then, connect the connecting bodies 4 and 5.6 to the connecting bodies 5 and 17L.

Furthermore, although the cylinder bore block 1 and the cylinder block body 2 are of different types in the embodiment,
This may be homologous.

For example, the cylinder bore block 1 and the cylinder block main body 2 may be iron-based castings or Narumi alloy castings. In the case of aluminum alloy castings, the cylinder bore block 1 may be made of a high-grade material that has good sliding surface characteristics with the piston, while the cylinder block body 2 may be made of a low material.

(Effects of the Invention) As explained above, according to the present invention, at least the contour surfaces of the upper and lower connecting bodies before or after integration with the cylinder liners for the number of cylinders and the connecting bodies should be press-fitted by temperature difference fitting. After cutting the cylinder block main body into a desired shape using numerical control, the cylinder bore block, which is composed of cylinder liners for the number of cylinders and at least the upper and lower connecting bodies, is placed in the bore hole recess of the cylinder block main body. The connecting body and the endless stepped portion of the cylinder block body to be fitted thereto are assembled by 1F temperature difference fitting, and the upper and lower connecting bodies and the stepped portion into which they are fitted are fully assembled. It is possible to easily obtain a cylinder block that is solidly integrated with two pins and has water-stop properties. In addition, the connecting body, the I-da part, and the T part are always machined to be uniform by numerical control to enable pressure-fitting through temperature difference, so the fitting can be carried out accurately, dramatically increasing the productivity of cylinder blocks. can be improved.

[Brief explanation of drawings]

Figure 1e is a plane 1'7I showing the cylinder block obtained by the present invention, Figure 2 is a sectional view taken along the IT-H line of Figure 11, Figure 5)'', Ren J, +? (Perspective view showing the cylinder bore block before machining, No. 4 [ν, 1 (l)
-1: Numerical control of the stepped part for supporting the 1'5G body 109
FIG. 3 is a cross-sectional view showing the cylinder block main body before cutting. 1... Cylinder bore block 2... Cylinder block body 5... Cylinder liner 4... Upper connecting body 6.
...Bottom (i!, jl connecting body 7...Bore hole recess 11
...Danbe (and 1 other person)

Claims (1)

[Claims] (1) The contour surface of the connecting body that is made by connecting cylinder liners for the number of cylinders by fitting at least the upper and lower parts of each cylinder liner into one body, The cylinder bore block has an integrated structure with cylinder liners for the number of cylinders and at least the upper and lower connecting bodies, by cutting the cylinder liner for the number of cylinders and at least the upper and lower connecting bodies by cutting into a shape that is press-fitted by temperature difference fitting "T Qi'" so that it is larger than the outline size of A cylinder block body having four bore holes for accommodating the cylinder bore block with gaps is cast in a process separate from the manufacturing process of the cylinder bore block, and then the upper and lower parts of the surface where the four bore holes are formed are cast. is cut using Ll value control to create an endless stepped portion that matches the contour surface of the upper and lower connecting bodies, and the upper and lower connecting bodies are press-fitted into the corresponding stepped portions by temperature difference fitting to form a silicon dowel block. A method for manufacturing a cylinder block, characterized in that a button is attached to a cylinder block body.