JPS5979056A - Cylinder block of engine and manufacture thereof - Google Patents

Abstract

PURPOSE:To simplify the structure of the block by a method wherein a spectacles type plate member is arranged on the stepped part of the upper surface around the bores of the main body of the cylinder block and the upper ends of wet-type liners are secured to the inside of the spectacles type plate while the lower parts thereof are fixed to the lower surfaces of the bores by tight-fitting. CONSTITUTION:The stepped part 4 is provided on the upper surface around the bores 2 of the main body 1 of the cylinder block, formed with water jacket 3 at the periphery thereof while the spectacles-type plate member 7, equipped with an engaging groove 6 at the inner peripheral side lower part thereof and holes 5 corresponding to the bores 2, is arranged on the stepped part 4. The upper end of the wet-type liner 8 is engaged with the engaging groove 6 by tight-fitting while the squeeze-out part is secured by welding at welded place 8. On the other hand, the lower part of the wet-type liner 8 is fixed to the lower surface around the bores 2 by tight-fitting and a seal member 10 is provided on the upper end of the fixing part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine cylinder block and a method for manufacturing the same.

Conventionally, the technology to reduce weight by using aluminum-based materials for cylinder blocks was General Motor Company's 1-Vega.
It is a technology that has been widely tried, not to mention car engines, and the combined use of steel liners has already been proven in racing car engines, but it is a mass-produced type with long-term durability and reliability. The reality is that they promise a connositive (small cylinder gap) and cheap manufacturing method, but the reality is that there are no viable products.

In general, the engine is made of aluminum Vt, and in light and small engines,
It is possible to make the wall relatively thin, the effect of the coefficient of thermal expansion is small, and rigidity can be obtained, so there are fewer problems, but as the engine becomes larger, it is necessary to make the wall thinner. As a result, various shortcomings begin to appear. Additionally, in order to extend the life of diesel engines, etc., a dry or wet method was used to press-fit the cylinder liner. There is an idea to use a sleeve made of cast steel or other material as a liner, but the above 1. For light and small engines, the capacity and weight of the aluminum block can be large relative to the size of the liner, so there are few problems with rigidity, but if this relationship is changed to a 4- or 6-cylinder engine, - If the size of the aluminum block is increased, the relatively proportional amount of aluminum blocks per volume and weight will be excessive, leading to excessive quality and increased costs. It is necessary to reduce the wall thickness of this aluminum block and provide ribs to increase its rigidity, but aluminum basically has a tensile strength of about 1/3 of that of iron, which poses practical problems, and There are many technical problems, such as the difficult solution and the difficulty in accumulating the know-how. Furthermore, aluminum has a thermal expansion coefficient approximately twice that of iron, and thermal changes and temperature differences cause problems in bonding with dissimilar metals. If the block is thick, it is possible to fasten the block in the form of compressive residual stress, but if the block is thin, it will bend, making it technically difficult. Alternatively, if a thick wet liner is simply provided, the cylinder spacing becomes large. Although it is not impossible to weld @ and aluminum, there is a problem with mass production technology, such as separability and poor productivity when casting iron with aluminum. many.

The present invention has been made in view of the above-mentioned problems, and is lightweight and can be mass-produced, has long-term durability and reliability, and has a cylinder block made of a wet type 2-inner cylinder and a steel alloy such as aluminum. It is an object of the present invention to provide an engine cylinder block and a method for manufacturing the same, which can solve the problems of connection and rigidity with the engine and further minimize the cylinder gap to achieve significant downsizing.

For this reason, the configuration of the cylinder block of the engine of the present invention is such that a stepped portion is provided on the surface around the bore portion around which the water jacket portion of the cylinder block body is formed, and a hole corresponding to the bore portion is formed in the stepped portion. A spectacle-shaped plate material having a shape and having no engaging portion formed on the inner circumferential F side portion is disposed, and the engaging portion is tightly fitted so as to protrude inwardly, and the spectacle-shaped plate material is A wet liner is fixed to the glass-shaped plate material by welding at the boundary with the part that protrudes inward, and further, the F side part of the liner is fixed to the lower surface around the bore part by tight fit. It is characterized by what it did.

In addition, the method for manufacturing an engine cylinder block according to the present invention has a configuration in which: a bore portion h of a cylinder block body; A spectacle-shaped plate material having a corresponding hole and an engaging portion formed in a lower portion on the inner circumferential side and a wet liner are each made separately in advance, and then the liner is inserted inwardly into the retaining portion. The liner and the spectacle-shaped plate are fixed by an interference fit so that the liner and the spectacle plate are fixed together, and the lower part of the liner is fixed by an interference fit to the peripheral F surface of the bore part, and The eyeglass-shaped plate material is arranged on the stepped portion formed on the upper surface of the periphery of the eyeglass-like plate material, and then the eyeglass-like plate material, ! : A feature is that welding is performed at the boundary with the liner that protrudes inward from the spectacle-shaped plate material.

+) Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIGS. 1 to 3, 1 is an aluminum cylinder block body, and 2 is a bore portion around which a water jacket portion 3 is formed. A stepped portion 4 is formed on the upper surface of the periphery of the bore portion 2, and this stepped portion 4 has a hole 5 corresponding to the bore portion 2, and a groove portion 6 serving as a retaining portion on the lower inner circumferential side. A blank spectacle-shaped plate 7 is provided. The wet liner 8 is closely fitted into the groove 6 and integrated into the spectacle plate 7. Here, the groove width in the horizontal direction of the groove portion 6 is smaller than the wall thickness of the liner 8, and protrudes from the liner 8 glass-shaped plate member 7 toward the cylinder side as shown in FIG. Further, this can be achieved by tight fitting, temperature difference fitting, press fitting, etc. between the spectacle-shaped plate material 7 and the two-in-one 8. 'P
(c) The alignment engagement portion is not limited to the groove portion 6, but may be a mere circumferential portion. In that case, a groove will be provided on the lychee side. If you like, it's okay to have no grooves. The lower part of the liner 8 is fitted into the bore part 2 by a glass-shaped plate 7 and the glass-shaped plate 7 by temperature differential fitting, press-fitting, etc.
There are several reinforcing welds on the circumference of the boundary with the liner 8 that protrude from the liner. In the figure, 101d is a seal member, 11 is the upper part of the piston, 12 is a cooling water passage,
The cylinder gap and bore pitch of the 133-inch cylinder bolt are shown.

Here, when forming the welded portion 9, the thermal influence does not reach the highest point of the first piston ring near the L end face of the liner 8. Naturally, the glasses-shaped plate material 7 and the liner 8 are made of metal-to-metal material, but in extreme cases, it is also possible to beam-weld both the 4F ceramic materials 2 together. However, the present invention is not only applicable to cylinder blocks made of aluminum, but can also be applied to cylinder blocks made of cast iron.

Next r1: The method for manufacturing an engine cylinder block according to the present invention will be further explained.

The spectacle-shaped plate material 7 and the liner 8 are each manufactured individually.

The bore pitch of each of the spectacle-shaped plate material 7 and the cylinder block body 1 can be manufactured with high precision, and the socket and the insertion portion between the spectacle-shaped plate material 7 and the liner 8 can also be processed with high precision.

A liner 8 is integrated with the spectacle-shaped plate 7 by tight fit, and the lower part of the liner is fixed to the lower part of the bore part 2 by tight fit. Then, the glasses-shaped plate material 7 is arranged on the stepped portion 4. In this case as well, the lower part of the liner 8 and the bore part 2 can be manufactured with high precision, and in particular, the part on the side of the bore part 20 is machined to the bore pitch. In addition, since the stepped portion 4 can also be milled with No. 7 tape, it can be processed with high precision.After this, reinforcing welding is required as shown in the welded portion 9. In this case, beam welding is of course acceptable, but it is also possible to assemble the glasses-shaped plate material with the reverse taper structure in advance by integrally setting the casting in the casting process of the cylinder block body.

Furthermore, since the subassembly consisting of the glass-shaped plate 7 and the liner 8 which are not integrated is made of iron, the coefficient of thermal expansion is small. (b), so there is little movement at the stepped part 4, and even though aluminum has a large coefficient of thermal expansion, the water cooling of the water jacket part 3 also prevents the upper glass-shaped part from moving. Since the temperature is lower than that of the plate material 7, there is no problem with the engagement with aluminum in the lower portion of the liner 8.Furthermore, the subassembly branch alone is sufficient to withstand the explosive force.

A cylinder head (not shown) is attached to the upper part of the cylinder block main body 1 configured as described above, and is covered with a gasket (not shown). Pressure is fixed.

As described above, according to the first invention, since the cylinder block is a combination of the cylinder block main body, liner, and spectacle-shaped plate material, weight reduction can be achieved, and the thermal expansion coefficient of the liner, which becomes high temperature, can be reduced. Since a small diameter liner can be used, it is possible to minimize variations in bore diameter and prevent performance deterioration.Also, although it is a wet liner system, it has high rigidity and mass production is improved. The liner was fitted with an interference fit so that it protruded inward into the groove, so
The cylinder rI11 gap can be minimized to achieve compactness, and the thin liner improves cooling performance.Moreover, the liner can be configured with fins, in which case cooling performance is further improved. It is possible to provide an engine cylinder block that has many effects such as:

Further, according to the second invention, since the glass-shaped plate material and the liner can be manufactured as a single unit, both parts can be processed with extremely high precision, and the degree of freedom in hardening, polishing, etc. is increased, and the company,
Various heat treatment methods can be selected, which greatly facilitates practical application, improves mass production, and reduces costs.Furthermore, the subassembly made by integrating the glass-shaped plate material and the liner is compatible. , it is easy to repair, and the cylinder block can be rebuilt by simply changing the dimensions of the subassembly until the cylinder block main body is t.
Furthermore, since the liner protrudes from the glass-shaped plate material, it is possible to provide a method for manufacturing an engine cylinder plot that has effects such as extremely simple and reliable welding of the boundary between the liners.

[Brief explanation of the drawing]

Figure 1 is a plan view of an embodiment according to the present invention, and Figure 2 is a plan view of an embodiment of the present invention.
! FIG. 3 is a perspective view of a liner and a subassembly in which the liner and the spectacle-shaped plate are integrated. 1... Cylinder block body 2-... Bore part 3.
...Water jacket part 4...Step part 5°°°
Hole 6... Groove 7... Spectacle-shaped plate material 8... Wet liner 9... Welded part Patent applicant Toyota Motor Corporation Figure 2 Figure 3 Figure 361-

Claims (1)

[Claims] (1) A stepped portion is provided on the upper surface of the periphery of the bore portion around which the water jacket portion of the cylinder block body is formed, and the stepped portion has a Z hole corresponding to the bore portion, and a lower portion on the inner peripheral side is provided with a stepped portion. A spectacle-shaped plate material with an engaging portion formed thereon is disposed;
11 A wet liner is fixed to the spectacle-shaped plate material by welding at the boundary with the part protruding inward from the spectacle-shaped plate material, and further, the F side part of the liner is attached to the lower surface around the bore part. An engine cylinder block characterized by being fixed with an interference fit. A spectacle-shaped plate material and a wet liner are each made separately in advance, and then the liner is fixed to the engaging portion with an interference fit so as to protrude inwardly, thereby bonding the liner and the spectacle-shaped plate material. nine, the lower part of the liner is fixed to the circumferential lower surface of the bore part by interference fit, and the spectacle-shaped plate material is disposed in a stepped part formed on the circumferential upper surface of the bore part. ,
A method of manufacturing a cylinder block for an engine, which further comprises welding the boundary between the spectacle-shaped plate material and the inner part protruding inward from the spectacle-shaped plate material.