机械齿轮的参数优化，设计一直齿圆柱齿轮传动, 已知其齿数比u= 4, 小轮轴

扭矩T 1= 100N. m, 单向传动, 润滑良好, 非对称布置, 两齿

轮材料 小齿轮40Cr, 调质, 齿面硬度HB= 250~ 280, [ RH ] 1

= 630MPa, [ RF ] 1= 288MPa 大齿轮45 钢, 调质, 齿面硬度

HB= 220~ 250, [ RH ] 2= 550MPa, [ RF ] 2= 204MPa, 取载荷系

数K = 1. 28。-Parameter optimization of the mechanical gear design has been Cylindrical Gear, known gear ratio u = 4, small axle torque T 1 = 100N m, one-way transmission, well-oiled, non-symmetrical arrangement of the materials of the two gears　pinion 40Cr quenched and tempered tooth surface hardness HB = 250 ~~ 280 [RH] 1 = 630 MPa [RF] 1 = 288MPa　large gear 45 steel, quenched and tempered tooth surface hardness HB = 220 to 250, [RH] = 550MPa , [RF] 2 = 204MPa, to take load factor K = 1 28.