| 摘要 |
Assuming that N1 and N2 are the respective numbers of pinion rollers (23, 63); rho1 is the ratio between the inner diameter of a ring roller (22) and the outer diameter of a sun roller (21); and rho2 is the ratio between the inner diameter of a ring roller (62) and the outer diameter of a sun roller (61); and it holds that N1=3, and (rho11)×(p21)>=24+16×20.5, in the case where N2=3, then it holds that rho1>=0.102×(rho1+1)×(rho2+1)+1.196, and rho1@min[0.204×(rho1+1)×(rho2+1)+3.123, 7+4×30.5], and in the case where N2=4, then it holds that rho1>=(2-20.5)×(rho1+1)×(p2+1)/4-1, and rho1@min [0.185×(rho1+1)×(rho2+1)+1.320, 7+4×30.5].
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