Description of the Pumping Rate of Shaft Counterfaces in the Sealing System Radial Lip Seal Using the 3D Parameters of ISO 25178

Abstract

The sealing system radial lip seal represent a complex tribological system with high requirements to be fulfilled over a long time. The surface texture of shaft counterface has a great influence on the performance of radial lip sealing system. A usability evaluation of shaft counterface with standardized 2D roughness parameters is not possible, because they represent only limited functional properties of the shaft counterface. With optical measurement instruments, shaft counterfaces can be measured in 3D. By using 3D metrology shaft counterface data the circumferential direction can also be evaluated. Together with the 3D surface parameters according to ISO 25178 this provides a fully new approach to evaluate shaft counterface. After the measurement, the data must be preprocessed to obtain meaningful parameters and to get a uniform database regardless of the manufacturing process. Measuring the pumping rate of shaft counterfaces is a common but time-consuming method to describe the quality of radial lip seals. For the evaluation of the 3D surface parameter according to ISO 25178 correlation analyses were performed by using a linear regression analysis. The correlation analyzes have shown, that the 3D parameters have the potential to describe the quality of shaft counterfaces for sealing purpose.

Keywords

• seals
• iso 25178
• roughness
• surface texture
• surface analysis