| 摘要 |
PROBLEM TO BE SOLVED: To extend the durability and life of a bearing by protecting a lower bearing arranged in a position close to a grease bath from a foreign matter spouting from the grease bath. SOLUTION: The rotation of a revolving hydraulic motor 10 is decelerated in two stages by epicyclic reduction gear mechanisms 14 and 19 within a reduction gear 4, and a rotating force of high torque is taken out from the output shaft 24 of the reduction gear 4. The pinion 25 of the output shaft 24 is meshed with the inner teeth 37 of a rotating wheel 32, and the revolution of the pinion 25 is transmitted from the output shaft 24 to a revolving frame 2 through a housing 5 to rotate a superstructure on a base carrier. Of upper and lower bearings 26 and 28 for supporting the output shaft 24 within the housing 5 of the speed reducer 4, the lower surface side of the lower bearing 28 vertically opposed to grease G in the grease bath 38 is covered with, for example, a filler 41 such as foamed urethane to protect the lower bearing 28 from the lower side.
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