Importance

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Abstract

In a gear train in which a gear case encases a first gear meshing with a second gear having a diameter smaller than that of the first gear, a sufficient amount of lubricant is normally supplied to the upper second gear. As a result, it is possible to provide a lubrication structure of a gear train encased in a gear case designed to prevent occurrence of problems such as poor lubrication and seizure of a gear train. In a lubrication structure inside a gear case having a configuration in which the gear case encases the first gear meshing with the second gear having the diameter smaller than that of the first gear, and the first gear is disposed so as to have a minute gap between the gear case and an outer diameter of the first gear, oil inside an oil chamber below the first gear is pumped up with a movement of gear teeth forming a minute gap by a rotation of the first gear; the pumped oil is discharged into a space above the first gear and inside the gear case; the pumped oil is received by an oil receiver provided in the upper portion of the second gear and including a rib for receiving the pumped oil and a recess surrounded by the rib; and then the oil is supplied to lubricate a gear tooth portion and a bearing portion of the second gear.

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First Claim