| 摘要 |
The present invention relates to a lubrication supply structure of a main bearing for a crank shaft of an engine, which comprises: the crank shaft (10) rotated axially, and having a flow path (11) diametrically penetrated therein; the main bearing (20) comprising a lower bearing (22) and an upper bearing (21) covering the lower half part and the upper half part of the outer circumferential surface of the crank shaft (10) respectively, and having multiple lubricant supply paths (21b); and an engine block (30) arranged on the upper side of the upper bearing (21), and having a lubrication supply path (31) supplying a lubricant to the flow path (11) of the crank shaft (10) through the lubricant supply paths (21b) of the upper bearing (21), wherein the lubricant supply paths (21b) circumferentially arranged in the upper bearing (21) is capable of supplying the lubricant while being matched with the flow path (11) of the axially rotated crank shaft (10). Therefore, the lubrication supply structure according to the present invention can be a diameter size variable structure in which the diameter size of the lubricant supply paths are varied to minimize a variation in the flow rate of the lubricant in the flow path of the axially rotated crank shaft while the flow path deviates from the upper bearing, so a pressure variation generated while the lubricant supply flow paths are closed when a crank is axially rotated can be minimized to reduce cavitation damage, thereby extending the service lives of parts and improving the reliability of equipment. |
