2、超前系数p 有图可知:huH=h2u p UH=u u= pub 设:h2=e(辊隙) h=h2+2(R-Rcose)=h2+2R(1 cose)=h2+4Rsin2(0/2) 当0很小时n2≈ 14RB2=1R2 P=+ 02 h222、超前系数ρ 有图可知:huH= h2u 1 2 = uH u h h ρ= ∵ uH= ub ∴u= ρub 设: h2 =e(辊隙) ∴h=h2+2(R-Rcosθ)=h2+2R(1- cosθ)=h2+4Rsin2 (θ/2) ∵ 当θ 很小时 ∴ 2 2 sin 2 2 2 ) 1 2 ( 4 1 e R h R = + = +