Speed reducer, production method for speed reducer, roller...

Details Speed reducer, production method for speed reducer, roller... Speed reducer, production method for speed reducer, roller...

2006-09-25

2009-06-30

Le, David D. (Department: 3655)

Planetary gear transmission systems or components

Planet periphery surrounds axis of interacting gear

Means to change speed ratio between input and output

C475S162000, C475S163000, C475S166000, C475S168000, C475S179000

Reexamination Certificate

active

07553249

ABSTRACT:
A speed reducer has a crankshaft to be rotated in conjunction with a drive unit. First through third eccentric portions are provided on the crankshaft. First through third externally-toothed gears are adapted to be moved respectively in conjunction with the first through third eccentric portions. Pin teeth are disposed along an inner periphery of a case to allow each of the first, second and third externally-toothed gears to be in meshing engagement therewith. An output shaft unit is adapted to be rotated in conjunction with the first, second and third externally-toothed gears. The first, second and third eccentric portions are arranged with a given phase difference in a rotation direction of the crankshaft with respect to each other. Each of the first, second and third externally-toothed gears is in meshing engagement with less than half of the plurality of pin teeth.

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