Since long ago

the stepless variable speed gear′s drive is considered to be impossible. The success in design of the stepless variable speed gear′s drive has changed the idea. Since this is a kind of meshing drive

high drive efficiency and reliability can be provided. In case of being overloaded

it does not slide and the transmitting ratio is accurate. It is easy and flexible to change velocity. Also

the value of output revolution can be set to zero. So

it may serve as a clutch. The gear drive is a space mechanism

which is compact and versatile in form

so that the manufacture technology is delicate.