Abstract
In this paper, the tooth profile of a kind of full conjugate helical gear pump was designed. The tooth profile of each of the gears is composed of three curves which are an addendum arc, an involute and a dedendum curve. The dedendum curve of one gear is the conjugate curve of the addendum arc of the other gear. The addendum arc and the dedendum curve are joined tangentially by an involute. The equations of the curves were deduced by using differential geometry. The ranges of parameters in these equations were also obtained. The meshing characteristics of the gears were analyzed. Two gears transmit continuously with a fixed ratio. Two gears engage each other point by point continuously along the entire profile and formed a continuous space meshing curve. The trapping oil phenomenon could be eliminated and the sealing property could be better than conventional involute gear pumps. The results of calculation and analysis of an application example showed the theoretical analysis and the practicability of the design were valid.
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