Calculation of torque

Transcription

1 Calculation of toque = toque that is exete on the ajusting nut (N) = eveage (N) = eve a () = xial foce (N) = oces on etic v-thea: N = Noal foce (N) = ictional foce (N) t = Tangential foce (N) Chaacteistics: = Noinal thea () = Pitch () = lank = () VS = Pitch angle = actan = actan ( ) ( ) = Half flank angle = 30 VS = Coefficient of fiction of steel/goun steel 0.15 = iction angle on v-thea ( ) = actan cos actan tan cos is a elatively sall angle 0.15 silifie: = actan = actan = 9.86 cos cos30 The following also alies: tan with '+' fo tightening an ' ' fo loosening t = Calculation of the toque / an axial foce on the thea: / = = Theefoe: t =.5 tan 0 = = tightening toque (N) = = loosening toque (N)

2 = = 0 / =.5 tan 0.5 / 0.5 tan actan tan actan / ( ) is a elatively sall angle We assue an aveage value of 0.9 (lease see table below) 6x0.5 8x x1 5x1 50x1.5 55x 150x 155x 00x = / tan fo futhe silification we use only instea of ( ) = / 0.5 tan = oosen: = Calculation of the fictional toque ajusting nut beaing suface = : Silifie with : = ictional toque ajusting nut beaing suface (N) = Coefficient of fiction 0.15 = veage suface of ajusting nut Note: only coes into effect if the ajusting nut is essing on the beaing suface. Toque being exete on the ajusting nut: oosen: n Note: Deivation of lease see below Values still to be taken into account: Suface essue on the thea flanks ax. axial loa 0.15 n

3 Pa Pa Silifie: Pa Pa H Pa = N/ ieck Z18 / = Nube of thea itches = thea length/itch = lank = () = xial foce (N) H 1 = Thea loa-beaing eth (VS) = () n shea stess on thea Silifie: = justing nut height () = 560 N/ echanical engineeing.39 Baking effect of gib /- (aial) cos60 With = 3.3 aveage value of thea 4-1 n 0. actan actan 13 cos cos30 with the silification 0.5 tan 0.5 tan tan Theefoe: cos Tightening toque (N) of the gub scew as e Bossa T.037 fo 4-16: Theefoe fo (N) fo one gib: Theefoe the esult fo fictional toque : n n n = Tightening toque of gub scew (N) = xial foce of gub scew (N) = ictional foce of gib on ajusting nut thea. (N) = Coefficient of fiction gub scew ajusting nut0. = of gub scew () = Baking toque of gib on ajusting nut thea (N) = of ajusting nut thea () = of gub scew () n = Nube of gibs = Tightening toque of gub scew (N)

4 Baking effect of gib /- (axial) = oce of eccentic on gib (N) t = Tangential foce on eccentic (N) = aius on oute suface of eccentic () = Tightening toque on eccentic (N) = ngle of eccentic to gib ( ) = ictional foce of gib on ajusting nut thea. (N) = Coefficient of fiction gib ajusting nut 0. t sin with t t sin Theefoe: cos60 (lease see above) cos60 sin sin 0.1 Theefoe the esult fo fictional toque : n 0.05 n sin = Baking toque of gib on ajusting nut thea (N) = of ajusting nut thea () n = Nube of gibs Note: The angle is eenent on which osition the gib has been goun. The toleances when anufactuing the eccentic, as well as the gib, also have a geat influence on the angle. Sale calculation: ssuing: n ajusting nut 50x1.5 ( gibs with 6) is use to cla a sinle beaing. The axiu axial loa on the beaing ust not excee 10,000 N. What ae the tightening an loosening toques? Tightening an loosening toque of the ajusting nut:

5 N oosen: n N 0.15 n Check suface essue/shea stess ax. axial loa: 14 Pa N 1.5 OK N OK ssuing: n ajusting nut 100x ( gibs with 8) is use to cla a sinle beaing. The axiu axial loa on the beaing ust not excee 5,000 N. What ae the tightening an loosening toques? Tightening an loosening toque of the ajusting nut: N oosen: n N n Check suface essue/shea stess ax. axial loa: 0 Pa N OK N OK