Supply channels in planetary rotary hydraulic and pneumatic machines with central wheel wave numbers different by unit

Abstract

The physical criteria limiting the size of the channels, including the conditions excluding the fl ow of the medium between adjacent cameras "under the satellite", are considered. The comparison of the variants of the channels execution is carried out: in the end wall of the epicycle; in the end wall of the sun gear; in the cylindrical toothed surface of the sun gear. The design criteria that characterize the relative sizes of the channels have been refi ned. For any planetary rotary machines with the number of waves N of the epicycle, which exceeds the number of waves M of the sun gear by two (N – M = 2), the channels should be located at the ends of the epicycle, but with N – M = 1, the relative cross-sections of the channels in the cylindrical toothed surface of the sun gear are much larger than in the end wall of the epicycle, therefore, for a planetary rotary machines with a low pressure of the medium, for example, vacuum pumps, it is advisable to make the channels in the cylindrical toothed surface of the sun gear.