Traction drive for e.g. driving cam shaft for valve operation of internal-combustion engine, has roller lying at return strand of actuated drawing unit, and another roller lying at loading strand of positive drawing unit

摘要

The drive has an actuated drawing unit (1) and a positive drawing unit (5), which runs parallel to the actuated drawing unit and is guided to a drive shaft (3) and a driven shaft (4) over a drawing unit disk (6). An adjusting unit has tensioning rollers (7, 8), which are supported on a radially movable tensioning roller shaft (9). The roller (7) lies at a return strand (1L) of the actuated drawing unit, and the roller (8) lies at a loading strand (5L) of the positive drawing unit.