| 摘要 |
PROBLEM TO BE SOLVED: To provide a radial needle bearing capable of reducing friction, and capable of realizing high rotation. SOLUTION: This radial needle bearing 20 is arranged between a support shaft 4e and a planetary gear 4c in the planetary gear mechanism 4 of an automatic transmission for a vehicle, and includes a cage 10 for rollingly holding a plurality of needles 16 arranged at a predetermined interval in the peripheral direction and used for guiding an outer diameter, and a floating bush 17 arranged between the cage 10 and the planetary gear 4c and relatively rotatable to the cage outer peripheral surface 15 and a planetary gear inner peripheral surface 4c1. COPYRIGHT: (C)2011,JPO&INPIT
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