Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Reexamination Certificate
1999-02-25
2001-05-01
Jones, Deborah (Department: 1775)
Stock material or miscellaneous articles
All metal or with adjacent metals
Having metal particles
C428S553000, C428S565000, C428S567000, C428S568000, C123S193200, C123S193300, C029S888061
Reexamination Certificate
active
06224989
ABSTRACT:
CROSS-REFERENCES TO RELATED APPLICATIONS
This application is substantially similar to Korean Patent Application No 97-44749 filed on Aug. 30, 1997, the disclosure of which is incorporated herein by reference.
FIELD OF THE INVENTION
The present invention relates to a cylinder block for an automotive engine and a method for fabricating the cylinder block.
BACKGROUND OF THE INVENTION
A cylinder block for an automotive engine is subject to cylinder wear from piston thrust. That is, piston rings sliding on a cylinder wall of the cylinder block as a piston moves up and down cause cylinder wear. Therefore, to prevent or reduce cylinder wear, as shown in
FIG. 1
, a replaceable cylinder liner
103
that is made of cast iron is provided on the cylinder wall of a cylinder block body
101
or, as shown in
FIG. 2
, a special treatment is performed on a cylinder wall of a cylinder block
201
such that the cylinder wall is impregnated with silicon
203
.
However, when using the cylinder liner
103
, which is simply mechanically connected with the cylinder wall, noise may occur in engine operation, and engine performance may deteriorate.
In addition, the cylinder block with the silicon-impregnated cylinder wall has the disadvantages of reduced durability and castability.
To overcome the above drawbacks, in recent years, an aluminum alloy cylinder block impregnated with a ceramic reinforcement material has been developed. However, while pouring molten aluminum alloy into a cylinder block forming mold, the mold should be in a high-pressure state, making it difficult to cast the cylinder block and increasing manufacturing costs.
SUMMARY OF THE INVENTION
The present invention has been made in an effort to solve the above-described problems.
It is an objective of the present invention to provide a cylinder block for an automotive engine that is light-weight and has good wear resistance, and can be fabricated under a reduced or no pressure state.
To achieve the above objective, the present invention provides a cylinder block for an automotive engine that includes a sintered cylindrical body made of a first metal, the sintered cylindrical body having a plurality of pores, a powder of a second metal dispersed into the pores of the sintered cylindrical body, and a cylinder block body disposed around the sintered cylindrical body while filling the pores of the sintered cylindrical body, the main body being made of a third metal and integrally formed with the sintered cylindrical body by an intemetallic compound formed by a reaction between the first, second, and third metals.
Preferably, the first metal is selected from the group consisting of Ni, Cr, Fe, and Ni-Cr alloy, the second metal is selected from the group consisting of TiO
2
, Cr
2
,O
3
, Ti, Mg, Li, and Sn, and the third metal is preferably an Al-Si-Mg alloy.
The porosity of the sintered metal body is preferably between 70-97%, and more preferably, about 80%.
A weight rate of the second metal power with respect to an entire weight of the sintered metal body dispersed with the second metal powder is preferably between 3-36 wt %, and more preferably, between about 4-22 wt %.
According to another aspect of the present invention, the above described cylinder block may be fabricated according to a method comprising the steps of preparing a sintered metal body made of a first metal material, the sintered body having a plurality of pores, dispersing powder in the pores, the powder being made of a second metal material, disposing the sintered metal body within a cylinder block forming mold, and pouring a molten metal of a third metal material in the cylinder block forming mold such that the molten metal fills the pores of the sintered meal body and forms an intermetallic compound by reacting with the powder and the sintered metal body, thereby obtaining the cylinder block.
Preferably, the method may further comprise the step of heat-treating the sintered metal body to remove impurities remaining on the sintered metal body before the step for disposing the sintered metal body in the cylinder block-forming mold.
The method may further comprise the step of heat-treating the cylinder block to adjust an amount of the intermetallic compound generated by a reaction between the sintered metal body and the molten metal.
REFERENCES:
patent: 4976918 (1990-12-01), Nishi et al.
patent: 5466360 (1995-11-01), Ehrsam et al.
patent: 5598818 (1997-02-01), Domanchuck
patent: 5829405 (1998-11-01), Godel
patent: 5960762 (1999-10-01), Imai
Christie Parker & Hale LLP
Hyundai Motor Company
Jones Deborah
Savage Jason
LandOfFree
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