| 摘要 |
PROBLEM TO BE SOLVED: To achieve a labyrinth structure which can restrict inflow of lubricating oil with relatively simple structure, by employing an existing general-purpose conical roller bearing as a bearing apparatus for supporting a pinion shaft, thereby to suppress increase of production cost. SOLUTION: A pinion shaft 12 is arranged and supported in a housing 11 by two conical roller bearings 13, 14 which are arranged separately from each other in an axial direction, and these two conical roller bearings 13, 14 are lubricated with lubricating oil in the housing 11 in an oil bath lubrication method. A labyrinth forming member 40 in a disc-like shape is disposed with respect to a backward conical roller bearing 13 of the two conical roller bearings, on an end face at a small diameter side of an inner ring 22 thereof in a press-contact manner, to be opposed to a rib part 24b which is formed inwardly in a radial direction at a small diameter end of a cage 24. In this manner, the labyrinth structure for restricting the inflow of the lubricating oil is formed between the rib part 24b at the small diameter end side of the cage 24 and the labyrinth forming member 40. COPYRIGHT: (C)2009,JPO&INPIT |
