| 摘要 |
PROBLEM TO BE SOLVED: To provide the bearing structure of an eccentric shaft, moderating the wear rate of a plurality of needles of a needle bearing and improving the durability of the needle bearing. SOLUTION: This bearing structure of the eccentric shaft 3 is such a structure that the eccentric shaft 3 with an unbalance mass 32 decentered with respect to the axial center of a shaft 31 is supported with a bearing 21 through the needle bearing 4 on both axial sides with respect to the unbalance mass 32. Each of the plurality of needles 41 of the needle bearing 4 has a crowning portion 411 formed into a crowning shape having a narrowest end and formed in an axial portion positioned on a side where the unbalance mass 32 is arranged, and a straight portion 412 formed into a straight shape parallel to an axial direction and formed in the remaining axial portion. COPYRIGHT: (C)2011,JPO&INPIT
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