Abstract： Aiming at the function of variable displacement gear pumps and the application of noncircular bevel gears, a kind of new intersection axis variable gear pump named higher order elliptic bevel gear pump was proposed. The gear pump is a non-circular bevel gear pump which takes the high-order ellipse bevel gear as working rotor. The gear profile formative method of gear rotor can be provided based on the space engagement theory. Transmission characteristic of the pump was analyzed according to the special kinematic traits of ellipse gear. Average theoretical flow formula, instantaneous flow formula and flow pulsation formula of this pump were deduced base on the differential theory of spherical space. Meanwhile the impact of eccentricity ratio and exponent number on flow characteristic was also analyzed. Average theoretical flow and instantaneous flow of high-order ellipse bevel gear pump were compared with both cylindrical gear one and noncircular cylindrical gear one under the same work condition and similar model parameter, and which shows that the characteristic of high-order ellipse bevel gear pump owns the features of higher delivery and wider range of variation.
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