| 摘要 |
PROBLEM TO BE SOLVED: To provide a power transmission device in which a load variation is not directly transmitted to a drive source, and a stepless gear change function can be automatically obtained without the necessity for manually operating the device.SOLUTION: A power transmission device comprises: a plurality of arms which can turn with an output rotating shaft as a pivot, and are connected to the output rotating shaft via a plurality of oneway rotating mechanisms, respectively; a plurality of elastic bodies which energize the plurality of arms to rotation-permitted directions of the respective oneway rotating mechanisms; a drive rotating shaft which is parallel with the output rotating shaft, and turned by a drive source; and a plurality of pins which are connected to the drive rotating shaft in parallel therewith so as to co-rotate with the drive rotating shaft, and can abut on tips of the plurality of arms, respectively. When the plurality of pins abut on the plurality of arms, the arms accumulate elastic energy at the elastic bodies by being pushed and returned by the pressing of the pins to directions in which the arms withstand energization forces of the plurality of elastic bodies, and when the pins are released in the abutment, the arms are driven to the rotation-permitted directions of the oneway rotating mechanisms so as to be turnable by energization forces generated by the elastic energy which is respectively accumulated at the plurality of elastic bodies.SELECTED DRAWING: Figure 1 |
