Abstract
A model and criterium for the jumping limit torque of timing belt drives are presented. The following parameters are considered: pulley geometry, belt geometry, belt strain stiffness, belt tooth stiffness, belt flexural rigidity, shaft stiffness and initial tension. Friction is important in separating jumping on driver and driven pulleys since the jumping behaviour is different at the two sides. Other parameters might influence the jumping limit torque as well. Moreover, great care must be taken to get good parameter data from the test setup.
The present analysis is restricted to driven pulleys. Calculated results of jumping limit torque and shaft load are presented for an XL-belt drive. The results exhibit the same behaviour as test results presented in the literature.
