KR20030021685A - cylinder liner structure for an Al cylinder block casting - Google Patents

Abstract

PURPOSE: A cylinder liner structure for die-casting an aluminum cylinder block is provided to easily attach/detach a liner guide to/from a cylinder block core by preventing core sand from falling down while minimizing a contact area between the liner guide and a cylinder liner. CONSTITUTION: A cylinder liner structure includes a liner guide(30) having an upper liner guide(31) and a lower liner guide(32) having a ring shape with a predetermined width. A groove is formed at an inner circumferential portion of the upper liner guide(31) and a lower liner guide(32). A barrel core(11) is mounted on a main core(10). The groove prevents the upper and lower liner guides(31,32) from being easily released from the barrel core(11). A stepped part is formed at an outer peripheral portion of the lower liner guide(32). The stepped part fixedly secures a liner inserted into the liner guide(30).

Description

Cylinder liner structure for an Al cylinder block casting

The present invention relates to a cylinder liner structure for casting aluminum cylinder blocks, and more particularly, by mounting ring type liner guides at both ends of barrel core molding, respectively, to facilitate removal of the liner guide, It is related with the cylinder liner structure for aluminum cylinder block casting which can expect improvement.

Recently, a lot of lightweight vehicles have been made for the purpose of improving fuel efficiency of automobiles. In particular, in the case of an engine, the engine block is made of aluminum in place of a cast iron material, which has a high specific gravity, and thus the weight is reduced.

However, the aluminum engine block can be made lighter than cast iron, but since the wear resistance is inferior, the cylinder liner is integrally manufactured when the engine block is cast in a place where abrasion resistance is required such as a cylinder. The cylinder liner usually uses a composite material, an overprocessed aluminum alloy, or a wear resistant cast iron material.

Hereinafter, a state of a cylinder block integrating a cylinder liner by a conventional method is as follows.

3A is a cross-sectional view showing a state in which a cylinder liner is mounted on a conventional aluminum cylinder block core. In order to cast the cylinder block, the block core 10 is usually formed of sand or the like. At this time, the block core 10 is integrally manufactured with the barrel core 11 for forming a cylinder on the upper surface. Subsequently, the barrel liner 11 is preheated to a predetermined temperature at a cylinder liner 20a, and the cylinder liner 11 is pre-heated to a predetermined temperature, and the cylinder block 11 is manufactured through a casting process.

However, this type of cylinder liner 20a causes the sand for the core at the top of the barrel core 11 to fall into the mold (not shown) upon or after insertion into the barrel core 11. After the casting caused a failure in the cylinder block needs to be improved.

Another example of manufacturing a cylinder block by applying another cylinder liner 20b is shown in FIG. 3B. When forming the block core 10 for manufacturing the cylinder block is formed integrally with the liner guide 30a made of steel in advance on the upper surface on which the cylinder is formed. The cylinder liner 20b is then fitted to the liner guide 30a to manufacture the cylinder block in the mold.

However, when manufacturing the cylinder block in this way, since the surface contact with the liner guide 30a when the cylinder liner 20b is inserted, it is difficult to remove the cylinder liner 20b after the insertion and the product is completed, Rapid cooling becomes difficult between the cylinder liner 20b, which is preheated to about 500 to 550 占 폚, with the liner guide 30a made of steel. Of course, there is a method of raising the preheating temperature of the cylinder liner 20b in order to prevent rapid cooling, but in this case, the structure of the liner becomes weak or the mechanical properties change.

The present invention has been made in view of the above, and minimizes the area in contact with the cylinder liner, while preventing the flow of the sand for the core, it is possible to facilitate the installation and removal of the liner guide cylinder liner cylinder liner structure The purpose is to provide.

1 is a perspective view showing a cylinder liner structure according to the present invention,

2 is a cross-sectional view showing an example in which the cylinder liner structure according to the present invention is applied to an aluminum cylinder block core;

3A is a cross-sectional view showing a state where a cylinder liner is mounted on a conventional aluminum cylinder block core;

3B is a cross-sectional view showing a state in which a cylinder liner is mounted on another conventional aluminum cylinder block core;

[Description of Symbols for Main Parts of Drawing]

10: block core 11: barrel core

20, 20a, 20b: cylinder liner 30, 30a: liner guide

31: upper liner guide 32: lower liner guide

33 glove 34 step

The present invention for realizing this is made of a ring shape having a predetermined width, the upper liner guide is inserted into the upper end of the barrel core to be mounted on the core, and the outer circumferential surface is formed in a stepped shape, the lower liner guide mounted to the lower portion of the barrel core Characterized in that consisting of.

In a preferred embodiment of the present invention, the upper and lower liner guide is characterized in that the glove is formed on the inner peripheral surface to prevent separation from the barrel core.

Hereinafter, with reference to the accompanying drawings, the configuration and effect of the present invention will be described.

1 is a perspective view showing a cylinder liner structure according to the present invention. Here, reference numeral 10 denotes a cylinder block core used for manufacturing the cylinder block, and 20 denotes a cylinder liner, respectively.

The present invention is to mount the cylinder liner 20 together to form an integral cast in forming the cylinder block core 10, in particular, the cylinder liner 20 is easily installed in the cylinder block core 10 And it relates to a liner guide structure that can be easily removed after casting.

The liner guide structure according to the present invention for realizing this includes a liner guide 30 composed of a ring-shaped upper liner guide 31 and a lower liner guide 32 having a predetermined width. In particular, a glow portion 33 is formed in the upper liner guide 31 and the lower liner guide 32 at regular intervals along the circumferential surface, and the glow portion 33 is the core 10. This is to prevent the barrel core 11 from being easily removed after inserting the respective liner guides 31 and 32 into the barrel core 11 mounted on the shell. In addition, the lower liner guide 32 has a step 24 formed on an outer circumferential surface, and the step 24 is for fixing a position by inserting the liner into the liner guide.

The liner guides 31 and 32 formed as described above are inserted into the barrel core 11 when forming the core 10 as shown in FIG. 2. Here, the barrel core 11 is inserted into the upper surface of the block core 10 to form each cylinder, and as shown in the accompanying drawings will be used to fit the block core 10. As described above, the barrel liner 11 is fitted with the upper liner guide 31 at the upper end thereof, and the lower liner guide 32 is fitted at the lower end thereof. In this case, the lower liner guide 32 is inserted into the barrel core 11 so that the step 34 faces upward.

In this way, the liner guide 30 is inserted into the barrel core 11, and then the barrel core 11 is inserted into the block core 10, and above it, that is, the cylinder liner 20 from the upper surface of the barrel core 11. Inserting is to complete the formation of the block core 10.

At this time, the cylinder liner 20 is fitted to the stepped portion of the liner guide 32 at the bottom to fix the position.

Therefore, the cylinder liner 20 is in surface contact by the width of the upper liner guide 31 and the lower liner guide 32 in the entire length of the barrel core 11, in particular, the cylinder to the barrel core 11 When the liner 20 is inserted, contact with the sand used as the core can be eliminated.

As described above, the present invention separates and partitions the liner guides used to install the cylinder liner into upper and lower liner guides, and these guides are configured to support the upper and lower inner circumferential surfaces of the cylinder liner.

1) By preventing the cylinder liner from directly contacting the sand for the core of the block, it is possible to reduce the defective rate of the cylinder block caused by the sand for the core.

2) Since the cylinder liner is in surface contact with the liner guide at the top and the bottom, it is possible to quickly insert the cylinder liner preheated to a certain temperature to maintain the mechanical properties of the cylinder liner.

3) It is also possible to facilitate removal of the liner guide from the cylinder liner after cylinder block manufacture.

Claims (2)

An upper liner guide having a ring shape having a predetermined width and inserted into an upper end of the barrel core mounted on the core; Cylinder liner structure for casting aluminum cylinder block, characterized in that the outer peripheral surface is made of a stepped shape consisting of a lower liner guide mounted to the lower portion of the barrel core. The cylinder liner structure for aluminum cylinder block casting according to claim 1, wherein the upper and lower liner guides have a glove formed on an inner circumferential surface thereof to prevent separation from the barrel core.