ABSTRACT
As shown in Figure 1, the new type of multi-gear pump is composed of one center gear and several
centers of the center gear and the NO. 1 driven gear in a horizontal manner, and also the symmetry line of the first tooth of the center gear. And then, the two lines coincide. When the line which connects centers of the center gear and NO. i driven gear coincides with the symmetry line of any tooth of the center gear, the instantaneous states of the NO. i and NO. 1 are completely synchronous. But if two lines do not coincide anywhere else, the instantaneous states of all sub-pumps contained in the multi-gear pump are not synchronous.
