JPH09209824A - Manufacture of cylinder block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a closed deck type cylinder block excellent in mechanical strength. SOLUTION: A cylinder block main body 3 and a sealing member 5 are constituted of an aluminum made casting, and a zinc alloy soldered layer is formed on a surface by applying ultrasonic oscillation at least to either one of an end part region of the cylinder block main body 3 and the sealing member 5. Thereafter, the sealing member 5 is fit on an end part region of a recessed part 9, a liner support hole of roughly the same as an outside diameter of a cylinder liner 11 is formed on the sealing member 5, a through hole for the liner is machined roughly in the same as the outside diameter of the cylinder liner 11 and the cylinder liner 11 is press fit in the liner support hole and the through hole for the liner.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a method of manufacturing a cylinder block, and more particularly to a method of manufacturing a cylinder block used for an automobile engine.

[0002]

2. Description of the Related Art A cylinder block of a water-cooled internal combustion engine such as an engine for an automobile has recently been particularly made of aluminum. Here, as the cylinder block type, there are a so-called closed deck type and an open deck type. In the closed deck type, a cooling water passage is formed around a cylinder, and members on the cylinder side and the cylinder block side are partially connected to each other at an upper end. On the other hand, in the open deck type, a cooling water passage is formed in the entire peripheral portion of the cylinder, the entire peripheral portion of the cylinder on the upper end surface of the cylinder block is released, and the cooling water passage is formed like glasses. It is a thing.

The closed deck type is generally manufactured by a low pressure casting method using a collapsible core for structural reasons (so-called undercut exists), while the open deck type is die cast. It is manufactured by the casting method. Here, in the open deck type, since the entire upper end of the cylinder block is released, the strength of this region is low. Therefore, conventionally, the following improvements have been proposed, but they have not been put into practical use.

For example, Japanese Laid-Open Patent Publication No. 1-100352 (first conventional example) proposes to weld and fix a piece member having a predetermined shape to the opening of the cooling water passage. In Japanese Patent Application Laid-Open No. 1-147145 (second conventional example), a predetermined piece member is welded and fixed to a release portion of a cooling water passage similarly to the first conventional example. It is made of an aluminum alloy having a higher melting point than the block body. Also, JP-A-2-1055
In Japanese Patent No. 57 (third conventional example), a predetermined plug member (piece member) is made of a material having a lower melting point than the cylinder block main body, and this is heated by a heat source such as an arc or a laser to the cylinder block main body. Weld.

[0005]

However, the above-mentioned prior art has the following disadvantages. That is, the production of cylinder blocks by the low pressure casting method is very expensive at present for complicated shapes such as cylinder blocks. Further, when the cylinder block body is manufactured by the die-cast casting method, gas is dispersed as fine voids and trapped inside the casting due to the characteristics of this manufacturing method. For this reason, the conventional welding method (laser, arc welding, etc.) has a disadvantage that gas defects appear remarkably and sufficient mechanical bonding strength cannot be obtained.

Further, the third conventional example in which a metal material having a melting point lower than that of the cylinder block is melted by the heat of the heat source has the following disadvantages. That is, a strong oxide film is formed on the aluminum surface of the cylinder block after casting, and cannot be firmly welded by an existing welding method or the like. On the other hand, even when welding is performed after surface treatment using a flux or the like, it is difficult to ensure sufficient bonding strength. Conversely, there has been a disadvantage that the flux induces corrosion of the aluminum member and the like.

Further, in the conventional welding method and the like, the influence of heat is exerted not only on the joint portion but also on a wide area around the joint portion, and there is a problem that the aluminum member is thermally deformed or thermally stressed. This is particularly problematic for engine parts that require precision machining.

[0008]

An object of the present invention is to provide a method for manufacturing a closed deck type cylinder block which has improved the disadvantages of the prior art and has particularly excellent mechanical strength.
With that purpose.

[0009]

In order to achieve the above-mentioned object, in the invention described in claim 1, the cylinder liner is formed as a cooling water passage having an inner diameter larger than the outer diameter of the cylinder liner. A cylinder block main body having a concave portion, a sealing member fitted in an end region of a passage wall surface forming the concave portion where the cylinder head is disposed, and sealing the concave portion; In a cylinder block having a liner through hole formed on the crankcase side of the main body, the cylinder block main body and the sealing member are made of aluminum casting, and at least one of the end region of the cylinder block main body and the sealing member. Ultrasonic vibration is applied to one of them to form a zinc alloy solder layer on the surface, a sealing member is fitted in the end region of the recess and they are joined together, and then sealed. The member and the liner through-hole processed almost equally to the outer diameter of the cylinder liner, press-fitting the cylinder liner to the liner support hole and the through-hole liner, adopts a configuration and method of.

As described above, the cylinder block main body is made of aluminum (alloy) casting, and the sealing member is also made of aluminum (alloy) casting individually.
Then, the sealing member is fitted to the end region of the recess via the zinc alloy solder layer while preheating.

At the same time, while the sealing member is being pressed against the cylinder block body, ultrasonic vibration is applied to the cylinder block body or the sealing member to form between the sealing member and the cylinder block body. The zinc alloy solder layer is melted. As a result, zinc alloy is generated at the joint between the cylinder block body and the joint member, and the temperature of the joint is lowered by stopping the ultrasonic vibration, and the two are firmly coupled.

After that, the cylinder liner is inserted into the cylinder block body integrated with the sealing member. As a result, the region surrounded by the cylinder liner, the cylinder block body, and the sealing member is formed as a cooling water passage. In particular, in the present invention, the open-deck type cylinder block body is first manufactured. Then, by fitting and fixing the sealing member, a wet liner type closed deck type can be obtained.

The invention according to claim 2 has a construction in which the sealing member has at least two liner support holes, and other aspects are the same as the invention according to claim 1.

According to the invention of claim 3, the range of formation of the zinc alloy solder layer on the cylinder block body is
The configuration and method of forming the end region of the cylinder block body is adopted, and other aspects are the same as the invention of claim 1 or 2.

Further, in the invention according to claim 4, when the cylinder block main body and the sealing member are joined, the sealing member is fitted to the end region of the cylinder block main body at a predetermined pressure and the vicinity of the end region. The method is the same as that of the invention according to claim 1, 2 or 3, in which the structure and method of heating the above at a temperature equal to or higher than the melting point of the zinc alloy solder.

Further, in the invention according to claim 5, when the cylinder block main body and the sealing member are joined, the sealing member is fitted to the end region of the cylinder block main body at a predetermined pressure and the end region is The configuration and method of heating the vicinity and thereafter applying ultrasonic vibration to at least one of the cylinder block body and the sealing member are adopted. Others are the same as the invention according to claim 1, 2, or 3. is there.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
A description will be given based on FIGS. 1 to 14.

First, FIG. 1 shows a completed cylinder block 1
3, reference numeral 3 indicates a cylinder block body of an engine (not shown), reference numeral 5 indicates a sealing member, and reference numeral 7 indicates a joint portion by ultrasonic vibration.

First, the cylinder block 1 according to the present embodiment is provided with a recess 9 formed around the cylinder liner 11 and having an inner diameter larger than the outer diameter of the cylinder liner 11 to form a cooling water passage. Body 3
A sealing member 5 which is fitted into an end region 9a (see FIG. 2) on the wall surface of the passage forming the recess 9 and on which the cylinder head is disposed, and which seals the recess 9; The main body 3 is provided with a liner through hole 10 formed on the opposite side of the end region 9a of the recess 9.

The cylinder block body 3 and the sealing member 5 are made of cast aluminum alloy, and ultrasonic vibration is applied to at least one of the end region 9a of the cylinder block body 3 and the sealing member 5. And a zinc alloy solder layer is formed on the surface. And after that,
The sealing member 5 is fitted into the end region 9a of the recess 9 and joined together. After that, the sealing member and the through hole for the liner are processed to have substantially the same outer diameter as the cylinder liner, and the liner support hole 6 is formed. Also, the cylinder liner 11 is press-fitted into the liner through hole 10. Here, liner through hole 1
As described below, 0 is machined after casting.
Therefore, their diameters are slightly different between the cast stage and the machined stage. However, for convenience of explanation,
Here, both are represented by using the reference numeral 10.

The method of joining the sealing member 5 to the end region 9a of the cylinder block body 3 will be described in detail. First, the portions of the zinc alloy solder bath 19 which are in mutual contact with each other are first described. While being immersed in the molten solder bath 15 (see FIG. 8), ultrasonic vibration is applied to form a zinc alloy solder layer on the surface of the joining portion. Then, after that, a process of inserting the sealing member 5 into the end region 9a with a predetermined pressing force and subsequently applying ultrasonic vibration while uniformly heating the periphery of the end region 9a to join them is adopted. doing. Here, when heating the end region 9a, a high-frequency heating method is used to uniformly heat the surrounding area, but the method is not limited to this, and low-frequency heating may be used, or LPG gas may be used. It may be heating by a burner or the like. Moreover, after inserting the sealing member 5 into the end region 9a with a predetermined pressing force, these are heated in a heating furnace (not shown), and then taken out from the heating furnace and the sealing member 5 or the cylinder block body 3 is superposed. Sonic vibration may be applied.

This will be described in detail below. As shown in FIG. 6, in this embodiment, a cylinder block main body 3 for a so-called four-cylinder engine in which four cylinders are arranged in a line is provided. The cylinder block body 3 is a die cast product made of aluminum. And this material is generally used ADC10, ADC12 and ADC1.
It is 4 mag.

Further, a predetermined concave portion 9 functioning as a cooling water passage is formed in the entire peripheral portion of the cylinder liner 11. As shown in FIG. 1, the recess 9 has a depth that reaches the vicinity of the lower end region of the cylinder liner 11, and the side on which the cylinder head is mounted before the sealing member 5 is fitted. Most of the ends of the are open (see Figures 2-4). Here, on the upper end surface of the cylinder block body 3, a cylinder head (not shown) is mounted,
It is processed flat. In addition, the concave portion 9 serving as the cooling water passage
Is formed to have a spectacle-shaped (see FIG. 6) outer shape so as to surround the periphery of each cylinder liner 11, and the cooling water passages of all the cylinders are connected to each other.

A crankcase 13 is formed in a lower region of the cylinder block body 3 so that a predetermined crankshaft (not shown) can be mounted therein (see FIG. 1). The lower end of the crankcase 13 is formed so as to be flush with a bottom case (not shown), and is connected to each other by a bolt member (not shown).

Next, a specific method of manufacturing the cylinder block 1 will be described. First, as shown in FIG. 2, an open deck cylinder block body 3 in which the entire upper end of the recess 9 is opened is used. The cylinder block body 3 is manufactured by the casting method (die casting method) as described above (S1 in FIG. 10) and then undergoes predetermined machining (S2). As shown in FIG. 3, this machining involves fitting the sealing member 5 into the end region 9a of the recess 9 so that the fitting portion 9b corresponds to the shape and size of the sealing member 5.
Is formed. When the fitting portion 9b is processed, end mill processing is used. By this machining, the fitting portion 9b is formed, and at the same time, the oxide film formed on the surface by casting is also removed, and the active metal surface appears on the surface. At this time, the shape of the fitting portion 9b is formed in a so-called oval shape so that the sealing member 5 described later can be fitted therein. However, this machining is not always necessary, and if the dimensions of the fitting portion 9b are formed with a predetermined accuracy by casting, for example, pretreatment may be performed by so-called pickling. .

After the above machining, the fitting portion 9b is preheated to a maximum temperature of 350 [° C.] (S.
3). Then, after that, the fitting portion 9 into which the sealing member 5 is fitted
b is immersed in the molten solder bath 15 (see FIG. 8), and a zinc alloy solder layer is formed on the fitting portion 9b (S in FIG. 10).
4).

The process for forming the zinc alloy solder layer will be described in more detail. As shown in FIG. 8, when the cylinder block body 3 and the sealing member 5 are joined together, it is necessary to preliminarily set a predetermined position on both of them. A zinc alloy solder layer is formed by applying sonic vibration. A zinc alloy solder layer is formed only on the fitting portion 9b of the recess 9 of the cylinder block body 3, and specifically, a zinc alloy solder layer is formed up to about 30 [mm] from the upper end surface on the side where the cylinder head is mounted. To be done.
In this case, the material of the zinc alloy solder is, for example, AH-Z95A (JIS Z) having a melting point of about 382 [° C.].
3281) is used. The fitting portion 9b is immersed in the molten solder bath 15 in which the zinc alloy solder is melted and held at 410 [° C.] to 430 [° C.], and ultrasonic vibration is applied.

The frequency of ultrasonic vibration is about 1
The frequency is set to about 8 [KHz] to 20 [KHz], and the oscillator output is applied in the range of 100 to 1000 [W]. The specific application time is several seconds. As a result, a predetermined zinc alloy solder layer is formed on the fitting portion 9b of the cylinder block body 3.

Here, the device for applying ultrasonic vibration to the cylinder block body 3 will be described in detail. The cylinder block body 3 has a predetermined vibration plate 1 as shown in FIG.
7 and the above-mentioned fitting portion 9b is the molten solder bath 15
Immersed in. The molten solder bath 15 is held by a solder bath 19 with a heater,
Is maintained at the above-mentioned predetermined value. Further, an ultrasonic oscillator 21 is engaged with the diaphragm 17 so that ultrasonic vibration is transmitted. The ultrasonic oscillating device 21 includes a horn 2 for applying vibration to the diaphragm 17.
3, a vibrator 25 for transmitting vibration to the horn 23, and an oscillator 27 for transmitting an oscillation signal to the vibrator 25.

On the other hand, when manufacturing the sealing member 5, FIG.
As shown in FIG.
It is formed in such a shape and size that it can be inserted into b (S5 in FIG. 10). However, the manufacturing method is not limited to the die-cast casting method, and may be manufactured by another casting method or by cutting a predetermined shape from the wrought material. Here, as shown in FIG. 7, the concrete shape of the sealing member 5 is such that four liner support holes 6 into which a cylinder liner 11 to be described later is inserted are arranged in a line, and the planar shape thereof has a semi-finished shape at both ends. It has a circular, so-called oval shape. That is, the sealing member 5 can integrally support the plurality of cylinder liners 11.

A plurality of cooling water passage holes 6a are formed around each liner support hole 6. The cooling water passage hole 6a is for circulating the cooling water between the cylinder head side (not shown).

Then, the surface of the sealing member 5 which is in contact with the cylinder block body 3 is subjected to predetermined machining. This is to make the joint between the sealing member 5 and the cylinder block body 3 stronger.

After being machined, it is preheated to a maximum of about 350 ° C. as in the case of the cylinder block body 3,
In addition, it is immersed in the molten solder bath 15 and ultrasonic vibration is applied. At this time, the conditions for forming the zinc alloy solder layer are almost the same as those for the cylinder block body 3 described above. As described above, the zinc alloy solder layer is formed on the surface of the sealing member 5. Here, when the sealing member 5 is immersed in the molten solder bath 15, a zinc solder layer is formed on the entire surface of the sealing member 5, but there is no particular problem in manufacturing. In addition, in FIG.
Although the work of forming the zinc alloy solder layer of the sealing member 5 is not described, it is similar to the case of the cylinder block body 3.

Here, the formation mechanism of the zinc alloy solder layer in the above-mentioned working process will be described with reference to FIG. 8. First, ultrasonic vibration is applied to the vibration plate 17 installed in the molten solder bath 15. Causes cavitation. Next, the generated cavitation destroys the fitting portion 9b of the recess 9 of the cylinder block body 3 and the oxide film on the surface of the sealing member 5, and an active metal surface appears. Then, an alloy reaction occurs between this active metal surface and zinc in the molten solder bath 15, whereby a strong zinc alloy solder layer is formed. Here, the diaphragm 1 of FIG.
The upper and lower parts of 7 are described as if they were divided. However, the molten solder is allowed to flow freely above the vibrating plate 17, and the molten solder is sufficiently adhered to the fitting portion 9b of the cylinder block body 3.

Next, the process of inserting and joining the sealing member 5 into the cylinder block body 3 will be described. As described above, the cylinder block body 3 and the sealing member 5 on which the zinc alloy solder layers are formed are prepared, and the sealing member 5 is an end region of the cylinder block body 3 as shown in FIGS. And is inserted into the predetermined fitting portion 9b.

Subsequently, the cylinder block body 3 in which the sealing member 5 is inserted into the fitting portion 9b is installed in the ultrasonic bonding device 28 (see FIG. 9) provided separately. This ultrasonic bonding device 28 carries a cylinder block body 3 and a horn 31 bonded to an ultrasonic vibrator 29 described later.
An air cylinder 33 for contacting the sealing member 5 is provided. Above the air cylinder 33, a predetermined ultrasonic oscillator 37 is provided. The ultrasonic oscillator 37 includes a horn 31 for directly applying ultrasonic vibration to the sealing member 5, and a vibrator 2 for transmitting the vibration to the horn 31.
9 and an oscillator 35 for giving an oscillation signal to the vibrator 29.
Consists of.

A predetermined heating device (not shown) is installed near the horn 31. This heating device includes a joint portion 7 between the cylinder block body 3 and the sealing member 5.
It is for preheating and is composed of a high frequency heater. However, the heating device is not limited to this, and may be, for example, a gas burner using a gas such as LPG.

The cylinder block body 3 carried on the air cylinder 33 is moved upward by the action of the air cylinder 33 and abuts on the horn 31 arranged above it. Correctly, it is inserted in the fitting part 9b,
The sealing member 5 still protruding from the cylinder block body 3 comes into contact with the horn 31. After that, the joint portion 7 is heated by the above-described heating device, and ultrasonic vibration is applied to the sealing member 5 by the horn 31. At this time, the air cylinder 31 is connected to the cylinder block body 3
Is constantly pressed against the horn 31 with a predetermined pressure, the zinc alloy solder layer is melted with application of ultrasonic vibration, and the sealing member 5 is fitted into the fitting portion 9b of the cylinder block body 3.
Is being inserted into.

Through the above steps, the cylinder block body 3 and the sealing member 5 are integrated. After that, the upper end surfaces of the sealing member 5 and the cylinder block body 3 become the same surface by a series of machining processes. Further, as described above, the liner support hole 6 of the sealing member 5 and the liner through hole 10 are machined to have substantially the same outer diameter as the cylinder liner 11. Further, as shown in FIG. 5, a liner fitting portion 9c having an inner diameter larger than that of the liner supporting hole 6 is formed around the liner supporting hole 6 on the upper surface of the sealing member 5. The liner fitting portion 9c is for fitting the flange portion when the cylinder liner 11 having a predetermined flange portion is press-fitted into the cylinder block body 3.

The present embodiment described above shows the case where ultrasonic vibration is applied when fixing the sealing member 5 to the cylinder block body 3. However, the present invention is not limited to this, and for example, instead of step S10 in FIG. 10, the vicinity of the joint 7 between the two may be heated to a temperature equal to or higher than the melting point of the zinc alloy solder and fixed by pressing. May be.

Finally, the cylinder liner 1 is inserted into the liner support hole 6 of the sealing member 5 and the liner through hole 10 described above.
1 is press-fitted. As a result, as shown in FIG. 1, the cylinder liner 11, the recess 9 of the cylinder block body 3 and the sealing member 5 form a cooling water passage in the entire peripheral portion of the cylinder liner 11, and substantially the wet liner. The closed deck type cylinder block 1 of the mold is completed.

Example Regarding the present invention, as shown in FIG. 11, ultrasonic vibration is applied to a test piece made of a plurality of kinds of materials to bond the two, and then a tensile test is performed to verify the bonding strength. did. In this test, the test piece A is regarded as a cylinder block body, while the test piece B is regarded as a sealing member. And as the dimensions of each test piece,
As shown in FIG. 11, the test piece A has an outer diameter of 16.0 [mm].
Thus, a recess having an inner diameter of 12.5 [mm] is formed, and the depth of this recess is 0.3 [mm]. In addition, the abutting surface of the recess is smoothed by precision processing to increase the reliability of the experiment. On the other hand, the test piece B is
It has an outer diameter of 12.0 [mm] and is designed to be inserted into the above-mentioned recess (see FIG. 12). Similar to the test piece A, the abutting surface of the test piece B is also formed by precision machining to have a smooth surface. The material of the solder used is the same as that described above, and AH-Z95A (J
IS Z3281) is used.

According to the results of using the above test pieces, as shown in FIG. 13, the test pieces A and B are "ADC1".
The average tensile strength when using 2 "is 142 [MP
a], and the fracture position is not the joint surface but the base material. Further, when the material was AC4B, the tensile strength averaged 200 [MPa], which also resulted in the base material breaking. The result of this base material fracture is shown in FIG. As is clear from FIG. 14, the joint surface did not collapse at all, and the base material near the joint surface was broken.

[0044]

As described above, according to the first aspect of the present invention,
Since the sealing member is ultrasonically soldered to the open deck type cylinder block main body, the cylinder block main body can be manufactured at low cost by using the die-cast casting method, etc. It can be soldered to the block body. Thus, the cooling water passage surrounded by the cylinder liner, the sealing member and the cylinder block body can be formed, and at the same time, the cylinder block having the mechanical strength and the strength similar to the closed deck type can be manufactured. It produces the excellent effect that

Further, since the closed-deck type cylinder block can be manufactured by the die-cast casting method, it has an excellent effect that the manufacturing cost can be greatly reduced as the productivity is improved as compared with the low-pressure casting method. Cause

According to the second aspect of the invention, since the plurality of cylinder liners are supported by the integrally formed sealing member, it is possible to manufacture a cylinder block having high rigidity. Cause

According to the third aspect of the present invention, since the zinc alloy solder layer is formed only in the end region of the cylinder block body, that is, the end region where the cylinder head is mounted, unnecessary zinc alloy solder is formed in the other regions. This has the excellent effect of preventing the formation of layers.

According to the fourth aspect of the present invention, the joint portion is heated to a temperature equal to or higher than the melting point of the zinc alloy solder to join the joint member to the cylinder block body. For this reason, a zinc alloy solder layer is formed between the two, resulting in an excellent effect that they are firmly bonded to each other.

Furthermore, in the fifth aspect of the invention, ultrasonic vibration is applied when the cylinder block body and the joining member are joined. For this reason, the excellent effects of heating each other more efficiently and forming a strong zinc alloy solder layer are produced.

[Brief description of drawings]

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

FIG. 2 is a side sectional view showing a state before a sealing member is fitted to the cylinder block body.

FIG. 3 is a side sectional view showing a state in which a sealing member is fitted to the cylinder block body.

FIG. 4 is a side sectional view showing a state in which a sealing member is fitted to the cylinder block body.

FIG. 5 is a side sectional view showing a state in which a liner fitting portion for fitting a cylinder liner is formed on the upper surface of the sealing member.

FIG. 6 shows a plan view of the cylinder block body disclosed in FIG.

FIG. 7 shows a plan view of a sealing member.

FIG. 8 is a schematic explanatory diagram of an apparatus showing a case of ultrasonically soldering a cylinder block body.

FIG. 9 is an explanatory diagram showing a case where ultrasonic vibration is applied to the joint after the sealing member is inserted into the cylinder block body.

FIG. 10 shows a flowchart for manufacturing the cylinder block of the present invention.

FIG. 11 is a diagram showing each test piece used for verifying the bonding strength, FIG. 9 (A) corresponds to a cylinder block body, and FIG. 9 (B) corresponds to a sealing member. .

FIG. 12 is an explanatory view showing a state in which the test pieces disclosed in FIG. 9 are butted against each other and ultrasonically soldered.

13 is a diagram showing the results of a tensile test of the test pieces of FIGS. 9 and 10. FIG.

FIG. 14 is an enlarged cross-sectional view showing the vicinity of the fracture surface of the test piece fractured by the tensile test shown in FIG.

[Explanation of symbols]

 1 Cylinder Block 3 Cylinder Block Body 5 Sealing Member 6 Liner Support Hole 7 Joint 9 Recess 9a End Area 9b Fitting 10 Liner Through Hole 11 Cylinder Liner

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[Procedure amendment]

[Submission date] April 23, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 11 is a diagram showing each test piece used for verifying the bonding strength, FIG. 11 (A) corresponds to a cylinder block body, and FIG. 11 (B) corresponds to a sealing member. .

Claims (5)

[Claims] 1. A cylinder block main body having a recess formed in a peripheral portion of a cylinder liner, the recess having a larger inner diameter than the outer diameter of the cylinder liner and being formed as a cooling water passage; A cylinder block provided with a sealing member that fits in an end region on the side where the cylinder head is disposed and seals this recess, and a liner through hole formed on the crankcase side of the cylinder block body. In the above, the cylinder block main body and the sealing member are made of cast aluminum, and ultrasonic vibration is applied to at least one of the end region of the cylinder block main body and the sealing member to apply a zinc alloy to the surface. A solder layer is formed, and then the sealing member is joined to the end region of the recess, and a liner having an outer diameter substantially equal to the outer diameter of the cylinder liner is attached to the sealing member. While forming a holding hole, the through hole for the liner is processed to have substantially the same outer diameter as the cylinder liner, and the cylinder liner is press-fitted into the liner support hole and the through hole for the liner. Cylinder block manufacturing method. 2. The method of manufacturing a cylinder block according to claim 1, wherein the sealing member has at least two liner support holes. 3. The method of manufacturing a cylinder block according to claim 1, wherein the range of formation of the zinc alloy solder layer on the cylinder block body is the end region of the cylinder block body. 4. The sealing member is fitted to an end region of the cylinder block body with a predetermined pressure, and the vicinity of the end region is joined by heating at a temperature equal to or higher than the melting point of the zinc alloy solder. Claims 1 and 2 characterized in that
Alternatively, the method of manufacturing a cylinder block according to the item 3 above. 5. The sealing member is fitted into an end region of the cylinder block body at a predetermined pressure, and the vicinity of the end region is heated, and at least the cylinder block body and the sealing member are at least heated. The method for manufacturing a cylinder block according to claim 1, wherein the joining is performed by applying ultrasonic vibration to either one of them.