| 摘要 |
PROBLEM TO BE SOLVED: To provide a crank bearing capable of properly discharging foreign matters in a bearing part. SOLUTION: This crank bearing rotatably supports a crank journal through the combination of semicircular upper bearing and lower bearing. Inner peripheral faces 15, 23 of end parts of the bearings are provided with crash reliefs 18, 24 and chamber parts 19, 26. The inner peripheral face 15 of the upper bearing is provided with an oil supply groove 13 circumferentially formed from one end face 16 of the bearing to the other end face 16. An area of a virtual circle Co having a maximum diameter in an opening face 13o of the oil supply groove 13 is determined to be larger than an area of a virtual circle Cr having a maximum diameter in a relief passage R5 formed in a state of being surrounded by the crash reliefs 18, 24, the chamber parts 19, 26 and an outer peripheral face 41o of the crank journal, and an area of the virtual circle Cr is determined to be larger than "0". COPYRIGHT: (C)2005,JPO&NCIPI
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