Abstract:In order to study the oil film flow of the actual bearing in the transition zone,a high speed visualization shear viscosity tester was developed and designed based on the related research results at home and abroad.The problems were solved for the shear viscosity tester such as visualization,how to get the high speed uniform clearance,and how to control the inner and outer cylinder size and position precision,and etc.The shear viscosity of several common mediums was measured with the new test device.Result shows that the developed shear viscosity tester can measure the shear viscosity of the base oil and compound oil,and the precision can meet the test requirements.