Micrometer Accurate Measurement of Tooth Wear Application-Specific in-situ Transmission Testing of Injection Molded Plastic Gears

摘要

Injection molded plastics are finding increasing application as gears due to their economical workability and innate material advantages over metals.Plastic gears are usually designed according to VD12736,which describes three aspects: thermal,mechanical,and tribological design.Tooth deformation is one of the important design parameters related to load-,temperature-,and time-dependent deformation and the underlying wear on the plastic gear.The concept of wear distinguishes between the running-in and the stationary phases [1].Its characteristic develops very differently depending on the load collective,e.g.,acting torque or operating temperature.In the running-in phase,non-linear wear rates are characteristic.In the stationary phase,wear rates are linear and comparatively low [2](Fig.i).Information regarding wear-related time-dependent tooth deformation and materials loss to the gear is essential in order to design a gear pair for a specific application.