上游久通大学 Tangential component: F,=2T/d1 Radial component: F.F,tg a cos B Axial component: F。=F,gB Total normal force: F=F/cos an cos B B-Helix an-Normal pressure angle 法向压力角 angle a,一Transverse pressure angle端面压力角 上游文大学 f=-F2F,1=-f2F1=-F2 directions:FF same as spur gears Fa-depends on directions of rotating and helix angle F 019 Tangential component: 1 1 Ft  2T / d Fr  Ft tg  n / cos  Fa  Ft tg  / cos  cos  Fn  Ft n αn—Normal pressure angle 法向压力角 αt —Transverse pressure angle 端面压力角 β—Helix angle Radial component: Axial component: Total normal force: 2 1 Ft1 Ft 2     Fr 1 Fr 2     directions：Ft 、Fr same as spur gears Fa — depends on directions of rotating and helix angle Fa1 Fa 2     n2 n1 Fr2 Fr1 Ft2 Ft1 n1 n2 Fa1 Fa2