KR19980045365A - Manufacturing method of engine bearing cap of automobile - Google Patents

Abstract

The present invention relates to a manufacturing method for wrapping a bearing in contact with a crankshaft and locally strengthening an engine bearing cap that is coupled to a lower portion of a cylinder block to support a crankshaft. Ac ₄ C + 5 to 15% by weight of the aluminum alloy formed of Al ₂ O _{3 It} is characterized by pressing the surface again. Accordingly, the bearing cap has sufficient durability against loads and shocks caused by power strokes, corresponding to engine performance and weight reduction, and also reduces vibration and noise.

Description

Manufacturing method of engine bearing cap of automobile

1 is a cross-sectional view showing an engine bearing and a bearing cap of an automobile according to the present invention.

2 is a side cross-sectional view of the engine bearing cap of the motor vehicle according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: Crankshaft 2: Cylinder Block

3: bearing cap 4: bearing

5: surface

[Technical Field of Invention]

The present invention relates to a method for manufacturing an engine bearing cap of an automobile, and more particularly, in a bearing cap of a crankshaft formed of aluminum (Al) instead of cast iron to reduce the weight of an engine, The present invention relates to a method of manufacturing a crankshaft bearing cap to have sufficient durability against impact.

[Private Technology]

In general, an engine of a vehicle includes a piston in which a plurality of piston pins are coupled to a plurality of combustion chambers formed inside an engine block, and is sealed with a cylinder head, and the piston is configured with a connecting rod connected to a crank shaft. .

Here, the crankshaft has an important function of generating power by converting the linear reciprocating motion of the piston of each cylinder into the rotational motion.

The crankshaft is rotatably supported on the lower part of the cylinder block, and is fixed to the inner surface of the cylinder block and the bearing cap through a sliding bearing.

Here, the bearing is made of a plate bearing formed in a semi-circular shape, the oil inlet is formed so that the engine oil flows into the inside.

Since the crankshaft bearing must convert the force of the reciprocating piston into the force of the rotational movement, the connecting rod is connected to the balancer so as to rotate and the crankshaft rotates.

[Technical problem to be achieved]

In the above-described support structure of the crankshaft, a large load and an impact are transmitted to the bearing and the bearing cap by the power stroke, and vibration and noise are likely to be generated by the rotation of the crankshaft.

In order to solve this problem, conventionally, an oil film is formed on the bearing surface to absorb loads and shocks, and to reduce vibrations and noises.

However, in recent automobile engines, aluminum bearing caps are used instead of cast iron for light weight, and the load is increased according to high performance, and thus, the durability of loads and shocks transmitted through the crankshaft is weak, and vibration and noise are high. There is a problem that occurs.

The present invention has been made to solve the problems of the prior art, the present invention has a sufficient durability in response to the high performance and light weight of the engine, and provides a method for manufacturing an engine bearing cap of a vehicle having a large damping effect of vibration and noise. .

[Configuration of Invention]

As a means for realizing the above object, the present invention proposes a method for manufacturing an engine bearing cap of a motor vehicle having a configuration described below.

That is, the present invention relates to a manufacturing method for auditing a bearing in contact with a crankshaft, and locally strengthening an engine bearing cap coupled to a lower portion of a cylinder block to support a crankshaft, wherein the surface in contact with the bearing is made of aluminum alloy. It forms, and press-casts the surface again, It is characterized by the above-mentioned.

Here, the aluminum alloy is formed of Al ₂ O ₃ of Ac ₄ C + 5 to 15% by weight. In addition, Ac ₄ C + It may be formed of 5 to 15% by weight of SiC.

EXAMPLE

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment for implementing this invention is demonstrated in detail based on an accompanying drawing.

1 is a partial cross-sectional view showing the engine bearing and the bearing cap of the motor vehicle according to the present embodiment, and FIG. 2 is a side cross-sectional view of the engine bearing cap structure of the motor vehicle according to the present embodiment, and FIG.

Reference numeral 1 in the drawings refers to the crankshaft. The crankshaft 1 is supported by a bearing cap 3 coupled to the lower part of the cylinder block 2, and is mounted by inserting a bearing 4 between the cylinder block 2 and the crankshaft 2. .

In this case, the bearing 4 is composed of upper and lower semicircular plate bearings, and has a structure in which an oil film is formed on the surface in contact with the crankshaft 1.

Here, in order to overcome the fragility of the aluminum material, the bearing cap 3 of the present embodiment locally strengthens a portion that is in contact with the bearing 4, that is, a portion that is subjected to a load and an impact by the power stroke of the engine. In order to improve, the surface 5 in contact with the bearing 4 is formed of an aluminum alloy, and the technical configuration is produced by press casting the surface again.

Here, the aluminum alloy is formed of Al ₂ O ₃ of Ac ₄ C + 5 to 15% by weight. In addition, Ac ₄ C + It may be formed of 5 to 15% by weight of SiC. Such aluminum alloys are well known for their high durability and wear resistance.

Although not shown in the drawings, the surface of the cylinder block 2 can also be locally strengthened in the same manner in this embodiment.

According to the manufacturing method of the present embodiment, the bearing cap 3 has a sufficient durability and attenuation of vibration and noise in a high-power engine, unlike a bearing cap made of simply aluminum according to high performance and light weight of the engine.

[Effects of the Invention]

Through the embodiments described above, it can be seen that the manufacturing method of the engine bearing cap of the automobile according to the present invention substantially solves the problems of the prior art.

That is, the bearing cap of the present invention has the effect of maintaining durability against large loads and shocks generated during power strokes, corresponding to high performance and light weight of the engine. Moreover, it has the effect of attenuation of vibration and noise by rotation of a crankshaft.

This effect ultimately extends the life of the bearing caps and provides a firm support for the crankshaft.

On the other hand, the present invention is not limited to the above-described specific preferred embodiment, and any person having ordinary skill in the art to which the invention belongs without departing from the gist of the invention claimed in the claims, various modifications Would be possible.

Claims (3)

An engine bearing cap of a motor vehicle which surrounds a bearing in contact with a crankshaft and is coupled to a lower part of a cylinder block to support a crankshaft, wherein the surface in contact with the bearing is made of aluminum alloy and manufactured by press casting the surface again. Method for producing an engine bearing cap of the vehicle, characterized in that. The method of claim 1, wherein the aluminum alloy is Ac ₄ C + 5 to 15% by weight of Al ₂ O ₃ The manufacturing method of the engine bearing cap of the automobile, characterized in that. The method of claim 1, wherein the aluminum alloy is Ac ₄ C + 5 to 15% by weight of SiC manufacturing method of the engine bearing cap of the automobile, characterized in that formed.