Under the condition of certain lubricating medium, transmission torque and shaft speed, the mating clearance between the Journal of gear shaft and their respective sliding bearings (hereinafter referred to as mating clearance) of high temperature melt gear pump directly affects the formation of lubricating oil film. Because of the friction force of gear shaft and the length of operation life, the mating clearance has a direct impact on the formation of lubricating oil film. It also changes with the condition of lubrication film, so the fit clearance position has a certain relationship with the friction force and service life of gear shaft.
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