机设书)查得动载系数02.1?vK由表10-2查得使用系数15?AK斜齿轮,假设mmNbFKtA/100/?由表10-3查得4.1??FaHaKK由表10-4查得7级精度,小齿轮相对支承非对称布置式423.1??HK由b/h=10.55,423.1??HK查图10-13得335.1??FK,故载荷系数1003.2423.14.102.11????????HHVAKKKKK7)按实际的载荷系数校正所算得的分度圆直径,由式(10-10a)得mmmmKKddtt73.706.103.249.653333????8)计算模数mmmmmzdmn98.22314cos73.70cos33??????3、按齿根弯曲强度设计由式(10-17)得弯曲强度的设计公式为??32322cos2FSaFadnYYzYKTm????????(1)确定公式内的各计算数值1)计算载荷系数91.1335.14.102.11????????FFVAKKKKK2)根据纵向重合度83.1???,从图10-28查得螺旋角影响系数88.0??Y3)计算当量齿数18.2514cos23cos3333?????ZZv24.9514cos87cos3344????ZZv4)查取齿形系数由表10-5查得616.23??FY190.24??FY5)查取应力较正系数由表10-5查得591.13??SY785.14??SY6)由图10-20c查得小齿轮的弯曲疲劳强度极限MPaFE5003??大齿轮的弯曲疲劳强度极限MPaFE3804??7)由图10-18取弯曲疲劳寿命系数91.03?FNK92.04?FNK8)计算弯曲疲劳许用应力取弯曲疲劳安全系数S=1.4,由式(10-12)得??MPaMPaSKFEFNF3254.150091.0333????????MPaMPaSKFEFNF71.2494.138092.0444??????
全文预览
