Unformatted text preview: nd radial forces at pitch po int. The tangent ial force transfers mot ion/torque between two shafts and the radial co mponent separates the two meshing gears. (a). W t tangent ial component W t × V power transmitted V pitch line velocit y V = pdn / 60000 [m/s], where d, pitch diameter, in mm, n rotation speed, rev/min o r V = pdn / 12 [ft/min], where d is pitch diameter, in inch, n is rotation speed, in rev/min (b). W r radial co mponent, which does no work, but tends to push gears apart. The components are related by: W r = W t × tan f The total force between two meshing teeth is W = (W t ) 2 + (W r ) 2 The transmitted power: W t (pdn ) Power = (in kilowatts), where Wt is in kN, d in mm, and n, in rev/min 60000 o r W t (pdn ) Power = (in horsepower), where Wt is in lbf, d in inch, n in rev/min 33000 12 Helical Gears: the force between meshing teeth can be decomposed to three components: tangential, radial and axial forces at pitch point. Only the tangent ial force transfers motion/torque between two shafts; both radial and axial co mponents separate the two meshing gears in radial and axial direct ions respectively. (a). W t tangential co mponent W t × V power transmitted V pitch line velocit y [similar to (a) of Spur gears’] (b). W r , W a are radial and axial co mponents, which does no wor...
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- Fall '09
- gear, po int, pitch diameter, ang le, Pitch circle Pitch