Basic Brake Calculation Formulas
Input parameters
Input force: F
Outside diameter: D
Inside diameter: D 0 (for disc and cone brakes only)
Width: b
Cone angle: β (for cone brakes only)
Number of brakes (brake surfaces): N
Brake pressure(Max.): p (Max.)
Brake pressure.Speed(Max.): p.v (Max.)
Start speed: n 0
End speed: n 1
Start energy: E, see Energy Calculation chapter
Calculated Parameters
Friction force
for band brakes
for others
where:
| α | Length by angle | |
| f | Friction factor | |
| F n | Normal force | |
| for disc brakes: | ||
F n = F / sin (β) | ||
| for others: | ||
F n = F | ||
Brake torque calculation
T = 0.5 D e F t
where:
Pressure calculation
where:
A = N b L | brake surface | |||
b | width | |||
L = 0.5 D s α | length | |||
| α | angle | |||
D s | mean diameter, for cone and disc brakes D s = 0.5 (D + D 0 ) | |||
for other D s = D | ||||
Rough check of warming a brake
p ≤ p (M ax. )
p v ≤ p v (M ax. )
where:
Calculation of braking time
where:
Number of revolutions until stop
Output Force F0
for band brakes only:
F 0 = F + F t = F e fα