Bending strength natio celebrate eyeshadow palette of injection molded polyacetal test gears is investigated in back-to-back testing using oil-lubrication.To validate state of the art calculation methods, tooth geometries with a variable number of teeth are investigated, maintaining a constant center distance and transmission ratio.To enable testing on a constant level of tooth temperature for variable torque loads and speeds, occurring tooth temperatures are measured and considered in latter testing.Test results show that bending strength of tooth geometries with a higher number of teeth stand higher tooth root stresses acc.
to VDI 2736, as the calculated tooth root stress is too high due to negligence of load-induced deflections.A modified method for calculating tooth root stress considers load-induced deflections, allowing to trace back the failures of the bempresas.com different tooth geometries to a common stress level.Therefore, a possible approach to consider the actual contact ratio for tooth root stress calculation of steel-plastic spur gear pairings is proposed.