Page 11 - BPW axles with air suspension Series O SL AL

Forces when braking 3.4

Normal forces of axle load:

F A ± D F A
F NB = 2
L2
F StN = F NB x L1 + L2

L1
F LfN = F NB x
L1 + L2

Braking force:
z
F B = x F NB
100

Forces of braking moment support:
F
F NB = Wheel force on ground during braking (N) ∆ F = B x h A
∆ FA = Axle load displacement when braking (N) ZB L1 + L2
(Depending upon design of vehicle, particulary with
drawbar trailer front axles)
Total force on the hanger bracket in
F StN = Hanger bracket force of wheel force on direction “X”:
ground (N) F StX = F B
F LfN = Air bag force of wheel force on ground (N)
F B = Braking force (N) Total force on the hanger bracket in
z = Braking performance (%) direction “Z”:
∆ FZB = Reaction force of braking moment (N) F StZ = F StN - ∆ F ZB

h A = Height of deflection over road surface
F StX = Total force on the hanger bracket in Total force on the air bag in direction “Z”:
direction “X” F LfZ = F LfN + ∆ F ZB
F StZ = Total force on the hanger bracket in
direction “Z”
F LfZ = Total force on the air bag in direction “Z”

Example HSFALM 9010 30 K:

F A = 88290 N h A = 600 mm
∆ F A = Zero is assumed in example
35316 x 600
∆ F ZB = = 24079 N
88290
FNB = = 44145 N 880
2
F StX = 35316 N
380
F StN = 44145 x = 19063 N
500 + 380
F StZ = 19063 - 24079 = -5016 N
500
F LfN = 44145 x = 25082 N
500 + 380 F LfZ = 25082 + 24079 = 49161 N
z = 80 %
F B = 0,8 x 44145 = 35316 N

BPW-EA-Luft 1023701e 11