Cycloidal Pinwheel Pair with Uniform Contact and One-tooth Difference

Abstract

Disclosed is a cycloidal pinwheel pair with uniform contact and one-tooth difference, comprising a stator and a rotor. Each gear tooth profile of the rotor has a modified recess provided symmetrically on both sides; the starting point (A) of the modified recess on one side of the gear tooth profile is located between a first point and a second point determined by locations of two limit positions, the end point (B) of the modified recess on the same side of the gear tooth profile is located between a third point and a fourth point determined by locations of two limit positions. By adopting the present disclosure, the internal leakage formed between high and low pressure chambers is effectively avoided, thereby significantly improving the volume efficiency and mechanical efficiency. Meanwhile, the present disclosure is extremely simple in structure and can be molded by one-time grinding with better manufacturability.

What is claimed is: 
     
         1 . A cycloidal pinwheel pair with uniform contact and one-tooth difference, comprising a stator with pin teeth in interval distribution, and a rotor having gear teeth meshing with the pin teeth of said stator, and each gear tooth profile of the rotor has a modified recess provided symmetrically on both sides; wherein,
 a starting point of said modified recess on one side of the gear tooth profile is located between a first point and a second point: when a predetermined pin tooth locates nearest to a meshing instant center, a first meshing point, formed by a pin tooth locating farthest to said meshing instant center and a corresponding gear tooth meshing therewith on a same side, is the first point; and when the predetermined pin tooth locates farthest to said meshing instant center, a second meshing point, formed by an adjacent pin tooth and a corresponding gear tooth meshing therewith on a same side, is the second point;   an end point of the modified recess is located between a third point and a fourth point:   when the predetermined pin tooth locates nearest to said meshing instant center, a third meshing point, formed by an adjacent pin tooth and a corresponding gear tooth meshing therewith on the same side, is the third point; and when the predetermined pin tooth locates farthest to said meshing instant center, a fourth meshing point, formed by a pin tooth locating nearest to the meshing instant center and a corresponding gear tooth meshing therewith on the same side, is the fourth point.   
     
     
         2 . The cycloidal pinwheel pair with uniform contact and one-tooth difference according to  claim 1 , wherein, the starting point of said modified recess is located midway between the first point and the second point. 
     
     
         3 . The cycloidal pinwheel pair with uniform contact and one-tooth difference according to  claim 2 , wherein, the end point of said modified recess is located midway between the third point and the fourth point. 
     
     
         4 . The cycloidal pinwheel pair with uniform contact and one-tooth difference according to  claim 3 , wherein, said modified recess is an equi-depth recess of the gear tooth profile of a standard cycloidal pinwheel. 
     
     
         5 . The cycloidal pinwheel pair with uniform contact and one-tooth difference according to  claim 4 , wherein, a depth of said modified recess is between 0.03 mm and 0.008 mm. 
     
     
         6 . The cycloidal pinwheel pair with uniform contact and one-tooth difference according to  claim 5 , wherein, a transition between a bottom of the modified recess and the starting point, and a transition between the bottom of the modified recess and the end point, are both smooth arc transitions. 
     
     
         7 . The cycloidal pinwheel pair with uniform contact and one-tooth difference according to  claim 4 , wherein, a depth of said modified recess is 0.012 mm.