| 摘要 |
A wave gear device ( 1 ), wherein when a wave generator ( 4 ) is in a low speed rotating state, a rolling bearing state is formed by a wave bearing ( 43 ) and the wave generator ( 4 ) and a flexible external gear ( 3 ) are held in a relatively rotatable state and when the wave generator ( 4 ) is in a high speed rotating state, partition pieces ( 7 ) and split side plate pieces ( 8 ) forming the retainer ( 47 ) of the web bearing ( 43 ) are displaced to the outside to stop the rotation of balls ( 46 ) in their axes and the revolution thereof. Accordingly, a sliding bearing state is formed by lubricating oil film ( 9 ) formed between the wave generator ( 4 ) and the flexible external gear ( 3 ) and the wave generator and the flexible external gear are held in a relatively rotatable state. When the wave generator ( 4 ) returns to the low speed state, the constraint of the wave bearing ( 43 ) is released by the elastic return force of the elastic ring ( 5 ) of the retainer ( 47 ) and the wave bearing ( 43 ) returns to the rolling bearing state. Since a rolling fatigue does not occur on the wave bearing ( 43 ) in high speed rotation, the wave gear device allowing the input of the high speed rotation therein can be realized.
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