Belts Flashcards
Belt length eqs
L = pi r1 + pi r2 + 2sprt[c^2 + (r2 - r1)^2]
Cross-belt Belt Length eqs
L = 2c + pi(r2 + r1) + [(r2 + r1)^2 / c)]
Wrap angles eqs
Formula sheet
θ1 = pi - 2 sin^-1[d2 - d1 / 2c]
θ2 = pi + 2 sin^-1[d2 - d1 / 2c]
Cross-belt wrap angles eqs
formula sheet but the d2-d1 is different
θ1 = θ2 = pi + 2 sin^-1[d2 + d1 / 2c]
Wrap angles eqs if d2 / d1 < 2
formula sh
θ1 = pi - [d2 - d1 / 2c]
θ2 = pi + [d2 - d1 / 2c]
Tension ratio eqs in static config
F1 / F2 = exp^μθ
Tension ratio eqs at high speed config
formula sh
[F1 - Fc] / [F2 - Fc] = exp^μθ
What is Fc in the high speed config tension ratio eqs
formula sh
Fc = ρ V^2 A
Turning force on a belt
F = F1 - F2
Driving torque on a belt
T = (F1 - F2) r
Power eqs
P = F V
What is V in the Power eqs
V = omega r = pi/60 N D/2
Common ratio of the Forces in the belts for a FLAT BELT
2.5 : 1
Common ratio of the Forces in the belts for a V-BELT
5 : 1
Common ratio of the Forces in the belts for a SYNCHRONOUS BELT
> 8 : 1
