| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw rotor, capable of restricting irregularity of deformation quantity by centrifugal force at the time of rotation. SOLUTION: This screw rotor 2 comprises a plurality of spiral teeth 13, and it is formed hollow. A front side tooth flank part 22 and a rear side tooth flank part 23 on both sides of a tooth apex 21 are formed in such a way that their diametric cross sectional form is asymmetric, and thickness size d1 of the front side tooth flank part 22 and thickness size d<SB>2</SB>the rear side tooth flank part 23 are in inverse proportion to arc length size L<SB>1</SB>and L<SB>2</SB>in the respective diametric cross sections. COPYRIGHT: (C)2006,JPO&NCIPI
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