Abstract:Design principle and structures of several gearbox churning loss testers used by former researchers from home and abroad were introduced.To overcome the defect of cumbersomeness and unrotatable gearbox part,a new multiuse tester with changeable inclination angle was developed.According to the test data,the new tester is proved to be flexible and fitting for churning loss experiments under many different working conditions,especially for those concerned with the effect of gearbox inclination.By adding additional insertions with different shape into the gearbox,the new tester can be used to investigate the influence of inner wall shape of gearbox on churning torque loss.