The paper analysed the influence of x gear on the movement law of each engaging point and the flow characteristic of the second kind of compound gear pump with x gear.

According to the analyses of initial and instantaneous displacement of each engaging point of the first kind of balanced compound gear pump, the formulas of instantaneous flow and flow pulsation of this pump with standard gear or X Gear are given, Furthermore the influence of X Gear on it’s flow characteristic is discussed.

The formulas are derived to calculate the axial coordinates of the characteristicpoints of the involute belical gear engagement of interlace axes, the condition equations arepresented for the synchronization of the right and left engaging point past the traverse plane,which provides theoretical basis to calculate the axial error and profile error in fine machin-ing.

Based on the unified mathematical model,it put forward the equivalent roller concept and showed the correspondence relationship between an equivalent roller and actual roller on the basis of the design concept of controllable point contacts of a spatial cam mechanism.

Comparing with normal involute gear transmission,point-line meshing gear transmission has a serial of advantages: good meshing capability,small abrasion,high efficiency,low noise,great carrying capacity,high intension,long life etc.

Different types of multi-point gear-meshing flexible transmission are introduced in the paper, the two-point gear-meshing construction is put forward, and the designing problems is preliminary researched.

Sphere-conical roller globoid cam point-contact mechanism and the application;