Importance

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Abstract

A swing reduction gear assembly for a swing device which prevents admission of grease into the same and in which the pressing force of grease squeezed out from between mutually meshing teeth of a pinion and an internal gear wheel thereof is reduced. The swing reduction gear assembly comprises a lower bearing for supporting an output shaft for rotation on a casing, a sealing collar fitted on an outer periphery of the output shaft and located above a pinion integrated with the output shaft, a retainer mounted on the casing below the lower bearing, and an oil seal fitted around the retainer and normally held in engagement with an outer periphery of the sealing collar. The oil seal has a lower face side lip portion formed thereon, and a disk-shaped plate is mounted on an outer periphery of the sealing collar such that the lower face side lip portion of the oil seal is normally held in contact with an upper face of the disk-shaped plate to prevent oil from entering the swing reduction gear drive.

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First Claim