Patent ID: 7565741
Filing Date: 2009-07-28
Classification: F04C,G06F,G16Z,Y10T

Abstract:
1. A method for designing lobe-type rotors adapted for generating a defined rotor and a conjugate rotor both having three or more than three lobes intermeshing and conjugating to each other by setting suitable parameters, including: curve portions of a single lobe of the defined rotor as a pattern generated by a curve E, an arc A, an arc B, an arc F, a straight line Y, then imaging (N−1) copy of the curve portion in which N represents the number of lobes and is bigger than or equal to three, and then respectively rotating each copy curve portion in sequence at an appropriate degree computed by 360/N to terminal degree which is computed by (N−1)*360/N, whereby to integrately form the defined rotor with three or more than three lobes; furthermore, by way of the curve portions of the defined rotor to generate conjugate curve portions for forming the conjugate rotor, wherein the method for designing a single lobe curve portion of the defined rotor comprising: designating a maximum radius R of the defined rotor and a width D of the defined rotor, a pitch circle radius Rp of the defined rotor and the conjugate rotor, a first center t defining a reference horizontal line h designating a second point P defining a second line h defining an arc B by drawing around the third center t defining an arc F by drawing around the first center t defining a straight line Y which is the external common tangent line of the arc B and the arc F, and respectively taking two tangent points P generating the curve portion of the single lobe of the defined rotor by linking the curve E, the arc A, the arc B, the arc F, and the straight line Y.