A sliding bearing having a groove-shaped oil storage space on the inner peripheral surface and its manufacturing method

Abstract

The present invention relates to a sliding bearing including embossing groove-shaped oil storing place at inner circumference and, more specifically, to a sliding bearing capable of remarkably improving lubricating path life time by easily providing the embossing groove-shaped oil storing place, which stores the sufficient oil in the inner circumference of a cylinder-shaped sliding bearing through plasticity processing of a metal flowing method. The present invention is particularly useful for a high load and low speed sliding bearing.

Description

technical field [0001] The present invention relates to a sliding bearing having an oil storage space in the shape of a groove on the inner peripheral surface by molding, and more particularly, to a concave groove that can store sufficient oil on the inner peripheral surface of a cylindrical sliding bearing easily by plastic working by a metal flow method. The groove-shaped oil storage space can greatly improve the lubricating life of the sliding bearing through one-time lubrication, and is especially suitable for the production of high-load and low-speed sliding bearings. Background technique [0002] In general, the sliding bearing is provided between the movable body and the fixed body, and is a device that smoothly moves the movable body on the fixed body while being in surface contact with the movable body and the fixed body. In particular, the above-mentioned sliding bearing has better impact resistance than the rolling bearing, and thus is widely used in sliding parts...

AI Technical Summary

Problems solved by technology

[0009] The basic goal to be pursued in all the above-mentioned prior technologies is to store as much lubricating oil as possible on the inner peripheral surface of the sliding bearing while minimizing the area of ​​the oil storage space where the lubricating oil is stored, thereby ensuring load-carrying performance, From this point of view, in order to store a relatively large amount of lubricating oil relative to the inner peripheral surface area of ​​the sliding bearing, the depth of the oil storage space in the groove shape should be deep, but if the depth of the oil storage space exceeds 1 / of the thickness of the sliding bearing 3. Because the strength of the bearing becomes weaker, the pull-off force becomes smaller relative to the amount of bending, so that the bearing will be detached during use. In addition, if the angle formed by the side wall of the oil storage space and the inner peripheral surface of the sliding bearing If the supplementary angle (α) is close to 90°, a sharp edge will be formed, which will prevent the stored lubricating oil from flowing out smoothly to the inner peripheral surface of the sliding bearing. The sharp edge (edge) interacts with the sliding bearing, thereby damaging the internally mounted part (shaft)

[0010] In addition, if the area of ​​the groove-shaped oil storage space exceeds a certain area ratio of the entire inner peripheral surface area of ​​the sliding bearing, although the area for supplying lubricating oil increases, the area for supporting the load becomes smaller, resulting in a relatively high load state , resulting in oil film breakage and insufficient bearing capacity

Therefore, the scheme of storing as much lubricating oil as possible while minimizing the area ratio is described in Korean Laid-Open Patent Publication No. 10-2011-0100254 figure 2 As shown, except for the first lubricating oil storage space formed on the inner peripheral surface (please refer to figure 2 The reference numeral 111), the second lubricating oil storage space is additionally formed on the outer peripheral surface (please refer to figure 2 reference numeral 112), and the above-mentioned two lubricating oil storage spaces are connected to each other through through holes, but in the above-mentioned prior art, although another lubricating oil storage space is formed on the outer peripheral surface, it cannot be optimally formed on the inner peripheral surface. The shape of the first lubricating oil storage space needs to ensure a high area ratio, that is, an excessive area ratio of 20.8 to 48.1%, in order to supply enough lubricating oil to the inner peripheral surface S1 of the sliding bearing 100 and make it circulate, thereby Reduce local oil film breakage, therefore, such a high level of area ratio is difficult to improve load-carrying

[0011] In addition, the groove-shaped oil storage space of the above-mentioned prior art, for example, as disclosed in Korean Laid-Open Patent Publication No. 10-2011-0091928 (Korean Patent Application No. 10-2009-0128646), is provided in a machining center (MCT) Korean One to three tools with a special shape of the tool tip in the shape of a font (similar to the Arabic numeral 7) are sequentially formed by machining one to three, so that an oil storage space is formed by machining on the inner peripheral surface of the cylindrical sliding bearing. Therefore, the rotation force of the tool is bent at 90°, so the rotation load rate is high, and excessive heat is generated in the tool, which brings great difficulties to the production

[0012] In the above-mentioned machining method, in order to optimize the cross-sectional shape of the oil storage space and process the groove whose cross-sectional structure changes with the processing depth of the groove, it is necessary to change the tip of the tool to a double structure for production. At this time, the shape of the processing line changes The discontinuity of the part may hinder the flow of oil in the final product, or in the actual processing operation, due to the short life of the tool, the time and cost required for tool replacement are quite high, thereby reducing productivity

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