The coupling with drum teeth is very sensitive to the lubrication state, and the poor lubrication often makes the coupling fail in a short time, so it is necessary to analyze this phenomenon theoretically. The forming Angle of lubricating oil film is the Angle between the direction of the contact line and the relative motion speed in the meshing process, which has a great influence on the conditions of forming oil film when the tooth surfaces are in relative motion.

The paper introduces the forming Angle of lubricating oil film for drum gear coupling

In order to analyze the lubricating oil film forming Angle of the coupling, the geometric mathematical model of the internal and external gear tooth surface must be established first, that is, the tooth surface equation of the internal and external gear. The meshing state in the moving region is the worst, and the meshing state of the coupling with non-conjugate tooth surface is similar to that of the coupling with conjugate tooth surface.

Their use shows that most of them fail in the middle of the inner gear tooth width and the glue wear of the middle section of the outer gear, and are very sensitive to the lubrication state. At most of the same meshing positions, the larger the number of teeth, the smaller the oil film formation Angle, but the smaller the rate of change for any drum tooth coupling with the same modulus of the number of teeth, the value is unchanged at all the same meshing positions.