KR20040021976A - Integral type cylinder for using in vehicles and manufacturing method thereof - Google Patents

Abstract

PURPOSE: An integrated type cylinder for vehicles and a manufacturing method thereof are provided to reduce weight of a cylinder and restrict a defect of an engine by removing gaskets and bolts. CONSTITUTION: In manufacturing a cylinder, convex combination parts(600) are respectively formed in a cylinder head(100) and a cylinder block(200) to form a normal cylinder shape after the cylinder head is combined with the cylinder block. A predetermined pressure and friction are applied to the combination parts for combing the cylinder head with the cylinder block. A groove(700) is formed around each combination part to prevent frictional heat from being transferred to other parts except the combination part.

Description

Integrated cylinder for vehicle and manufacturing method therefor {INTEGRAL TYPE CYLINDER FOR USING IN VEHICLES AND MANUFACTURING METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder for a vehicle and a manufacturing method thereof, and more particularly, to an integral formation of a cylinder head and a cylinder block.

The cylinder for a vehicle must secure a cooling water distribution path in the outer periphery of the cylinder, and its structure is complicated in order to improve the assemblability of the intake and exhaust valves. For this reason, vehicle cylinders have been manufactured by assembling several parts produced separately.

Looking at the schematic structure of a conventional vehicle cylinder with reference to Figure 1, as follows. The upper part of the cylinder head 100 is formed with a bolt hole into which the head bolt 400 can be inserted. The head bolt 400 inserted through the bolt hole includes the cylinder head 100, the valve seat 500, It is fastened to the cylinder block 200 by passing through the gasket 300.

However, components such as the head bolt 400, the bolt hole, the gasket 300, and the valve seat 500 are obstacles to the weight reduction of the cylinder for the vehicle, resulting in an increase in cost. In addition, these fastening structures can loosen over time, resulting in various engine failures.

For example, in the related art, as shown in FIG. 1, in coupling the cylinder head 100 and the cylinder block 200, a gasket between the cylinder head 100 and the cylinder block 200 is prevented to prevent the outflow of gas. 300 is used. However, due to the endurance performance of the gas cat 300, if not exchanged after a certain period of use, a gap in which gas may leak may occur, thereby reducing the explosion force inside the cylinder. On the other hand, the head bolt 400, which is used as a means for fastening the cylinder head 100 and the cylinder block 200, should be given a large torque to maintain the bolt axial force at a constant value in order to prevent the above-described gas leakage. Due to this, residual stresses may be generated in the cylinder head 100 and the cylinder block 200, which may cause damage to the cylinder head 100 or the cylinder block 200. In addition, the engine oil leaks during driving depending on the hardening state of the gasket 300, fine dust, or the like during assembly. This increases the risk of fire.

Accordingly, it is an object of the present invention to provide a lighter cylinder and a manufacturing method thereof by removing fastening structures such as gaskets and bolts.

It is another object of the present invention to provide a cylinder and a method of manufacturing the same, which prevent the gas leakage and thereby reduce the explosion pressure inside the cylinder.

It is still another object of the present invention to provide a cylinder and a method for manufacturing the same, which reduce manufacturing costs and shorten the time required for assembly by eliminating complicated fastening structures.

1 is a configuration diagram showing the structure of a conventional cylinder.

2 is a cross-sectional view showing a cross section of the cylinder head and the cylinder block before coupling the cylinder head and the cylinder block when manufacturing the integrated cylinder according to the embodiment of the present invention.

3 is a view illustrating a process of welding the coupling portion of the cylinder head and the cylinder block by friction when manufacturing the integrated cylinder according to the exemplary embodiment of the present invention.

Figure 4 is a cross-sectional view showing a cross section of the integral cylinder manufactured according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100.cylinder head

200 ... cylinder block

300 ... Gascat

400 ... head bolt

500 ... valve seat

600 ... Joint

700 ... Home

In order to achieve the above object, the present invention provides a method of integrally manufacturing a cylinder head and a cylinder block mounted on the upper and lower portions, respectively. By applying a pressure and friction of the, provides a method for manufacturing an integrated cylinder for a vehicle comprising the step of coupling the cylinder and the cylinder block.

More preferably, the present invention provides a method of manufacturing an integrated cylinder for a vehicle, wherein the forming of the coupling portion further comprises forming a groove around the convex shape.

More preferably, the present invention provides a method for manufacturing an integrated cylinder for a vehicle, characterized in that the cross section of the coupling portion of the cylinder head and the cylinder block coincide with each other.

Referring to the process of manufacturing a cylinder according to an embodiment of the present invention, as follows. First, the valve seat and the valve are mounted on the cylinder head. Fix the valve by using a temporary tong to prevent the valve from moving up and down. Use a jig to match the contact surfaces of the cylinder head and cylinder block to each other. Thereafter, the convex portion of the cylinder engaging portion formed in the circumferential direction of the cylinder is rubbed using a friction rod inside and outside the cylinder while applying a predetermined pressure. The liner is inserted after the welding by friction is completed, and the subsequent steps are the same as in the conventional cylinder assembly method.

Figure 2 is a cross-sectional view of the cylinder head and the cylinder block before the coupling in the manufacturing method according to an embodiment of the present invention, Figure 3 is a view for explaining the coupling step of coupling using a friction rod, Figure 4 after coupling Sectional view of the cylinder. The present invention will be described in more detail with reference to the following.

As shown in FIG. 2, the present invention allows the coupling portion 600 to be convexly formed inside or outside the cylinder in forming the coupling portion 600 of the cylinder head 100 and the cylinder block 200. As such, the reason why the coupling part 600 is convex is to be convex in advance in consideration of the fact that the coupling part 600 is deformed by frictional heat when the coupling part 600 is rubbed under a predetermined pressure. This is to ensure a normal cylinder shape after joining. In addition, by forming the engaging portion 600 convex in this manner, the friction of the engaging portion 600 by the friction rod becomes easier.

On the other hand, the groove 700 is formed around the coupling portion 600. By forming the groove 700 in this way, the frictional heat is suppressed from being conducted to other portions other than the coupling portion 600 to shorten the time required for the engagement by friction, and the shape of the portion other than the coupling portion 600. To prevent deformation due to the frictional heat, and when the convex portion of the coupling portion 600 is deformed due to the frictional heat, the component of the convex portion can be introduced into the groove 700 portion, so that the cylinder becomes flat. to be.

On the other hand, in order to increase the coupling force of the cylinder head 100 and the cylinder block 200, it is more preferable that the cross sections of the cylinder head 100 and the cylinder block 200 coincide with each other. In addition, the size of the convex portion of the coupling portion 600 is important for more fully coupling the cylinder head 100 and the cylinder block 200, which is appropriately determined according to the size of the groove 700 and the amount of frictional heat. do.

3 illustrates a process of rubbing the coupling part 600 by using a friction bar. As shown in Fig. 3, by applying the axial load to the friction rod and rotating it, friction heat is generated and welding is performed. do. 4 is a cross-sectional view of the cylinder in which the welding is completed, and it can be seen that the convex portion and the groove before the welding are processed flat.

As described above, in the present invention, when the cylinder head and the cylinder block are fastened by using a welding method without using bolts and gaskets, the engine defects caused by loosening of the fastening can be suppressed and the engine weight can be reduced. It's effective.

In addition, the present invention provides an optimized process in welding the cylinder head and the cylinder block by welding, thereby preventing deformation of portions other than the joining portion and minimizing the time required for welding.

As mentioned above, the present invention has been described by way of example, and the present invention is not limited to the above-described examples, and the rights of the present invention are determined according to the appended claims. In addition, various modifications of the present invention can be carried out by those skilled in the art, but it is obvious that all belong to the scope of the present invention.

Claims (5)

A method of manufacturing a cylinder head and a cylinder block integrally mounted on an upper part and a lower part, respectively, Forming a convexly shaped coupling portion in each of the cylinder head and the cylinder block, Engaging the cylinder and the cylinder block by applying a predetermined pressure and friction to the engaging portion. The method of claim 1, Forming the coupling portion further comprises forming a groove around the convex shape. The method according to claim 1 or 2, And a coupling portion of the cylinder head and the cylinder block coincides with each other. In a vehicle integrated cylinder comprising a cylinder head and a cylinder block, The cylinder head and the cylinder block each have a coupling portion formed for mutual coupling, The coupling unit is a vehicle-integrated cylinder, characterized in that having a convex cross-section to facilitate engagement by friction. The integral cylinder for a vehicle according to claim 4, wherein the coupling part has a groove formed around the convex shape.