| 摘要 |
A power transmission device has a primary driven gear and a scissor gear arranged abreast in a superimposed manner concentrically with the primary driven gear so as to be shiftable from it. Both the gears have plural pairs of openings superimposable to each other, so that each pair of the openings form an opening space. In each opening window a damper spring is provided and compressed so that the spring's ends press both edges of the opening space, with the spring's side portions engaged with the side face of the rotor so that one or both the primary driven gear and scissor gear, are resiliently coupled with the rotor by way of the damper springs. Further, for each damper spring, a scissor spring having a smaller diameter than that of the damper spring is inserted inside the damper spring so that the ends of the scissor spring press both edges of the openings, to thereby urge and regulate the primary driven gear and scissor gear so as to keep the phase difference therebetween with respect to the rotational direction thereof, constant in a steady state. |
