| 摘要 |
PROBLEM TO BE SOLVED: To provide a speed reducer which has high processability of a main bearing and, further, can reduce a cost thereof.SOLUTION: A speed reducer 2 includes a casing 16, an internal teeth gear 48, an external teeth gear 44 which is inscribed and mated to the internal teeth gear 48, and a main bearing 18 interposed between the casing 16 and a flange body 12. Therein, a pair of cylindrical roller arrays 60, 61 comprising a plurality of cylindrical rollers 60A, 61A having rotation shafts O2, O3 inclined to an axial line O1 of the internal teeth gear 48 are provided as rolling bodies of the main bearing 18, inner races 64, 66 and outer races 68, 70 which provide rolling surfaces of the cylindrical rollers 60A, 61A are provided, there are not flange parts which restrain the movement of the cylindrical rollers 60A, 61A in the axial direction on the inner races 64, 66 and the outer races 68, 70, the movement of the cylindrical rollers 60A, 61A in the axial direction is restrained by retainers 74, 76, and the retainers 74, 76 are in contact with members besides the main bearing 18. |
