A Globoidal-Cam Type Gearing

Abstract This paper describes a globoidal-cam type gearing with roller-wheel composed of two lines of roller followers to obtain a no-backlash reduction gearing. A principal advantage of this system is the reduction of backlash of the gearing by holding the cam’s rib with the roller followers of each line. We suggest that the roller’s axis should make a reasonable angle to the wheel’s axis. By setting this angle to a suitable amount, the power loss of the gearing will be reduced significantly. The gearing of which roller’s axes are inclined can be applied to high speed and large torque gearing indicating a remarkable improvement upon roller-wheel gearing. A typical globoidal-cam type gearing is analyzed geometrically, its frictional loss of power in meshing is calculated, and a substantial reduction of friction loss was resulted. Additionally, the stiffness of the roller-wheel was estimated and is practically sufficient for our application.