Study on lubrication and dynamic sealing performance of seals under high pressure and high speed

The sealing ring, as the rotary sealing devices, are one of the most important components in the wet clutch unit of a heavy load vehicle, whereas the failure of the rings occurred only after a service of about several months. So it is necessary to investigate the wear mechanism and failure cause of sealing rings in order to provide the essential evidence and critical feedback into the design process. According to the environmental and service conditions of seals in the transmission, the characteristics of the fluid film were studied. The pressure and their regular pattern with working conditions were obtained. The lubrication of seals was researched by fluid film. Based on the force analysis of sealing ring, the balance between closing force and bearing force was confirmed to discuss the patterns of sealing friction and wear behavior. Selecting reasonably conditions exerted on seals and simulating the actual operations of the transmission, axial force and its variabilities with pressure and rotating speed were obtained by computation of equations.