Database Product Finder
T-140 The  directions  of  forces acting on a helical gear mesh are   shown   in   Figure   16-4. The  axial  thrust  sub-compo- nent   from   drive   gear,   Fa1, equals  the  driven  gear's,  Fa2, but   their   directions   are   op- posite.  Again, this case is the same   as   tangential   compo- nents Fu1, Fu2 and radial com- ponents Fr1, Fr2. 16.3  Forces In A Straight     Bevel Gear Mesh The   forces   acting   on   a straight bevel gear are shown in   Figure   16-5.      The   force which is normal to the central part of the tooth face, Fn, can be  split  into  tangential  com- ponent,  Fu,    and  radial  com- ponent,   F1,   in   the   normal plane of the tooth. Fu = Fn cosa ü ï ý  (16-5) ï F1 = Fn sina þ Again,  the  radial  compo- nent,  F1,  can  be  divided  into an axial force, Fa, and a radial force, Fr , perpendicular to the axis. Fa = F1 sind ü ï ý   (16-6) ï Fr = F1 cosd þ And the following can be derived: Fa = Fu tanan sind  ü ï ý   (16-7) ï Fr = Fu tanan cosd þ Fig. 16-5     Forces Acting on a      Straight Bevel Gear Mesh F1 Fn Fu a d d F1 Fr Fa Right-Hand Pinion as Drive Gear Left-Hand Gear as Driven Gear I Left-Hand Pinion as Drive Gear Right-Hand Gear as Driven Gear II Fr1 Fa2 Fr1 Fr1 Fr1 Fa1 Fu1 Fr2 Fa2 Fu2 Fu2 Fr2 Fa1 Fu1 Fa1 Fa2 Fu1 Fr2 Fa1 Fu2 Fu2 Fr2 Fa2 Fu1 Fig. 16-4     Directions of Forces Acting on a    Helical Gear Mesh