Page 51 - Catalog auto parts VECTOR for trucks GIGANT

Auto Parts / trailer axles
centre of gravity
payload
centre of gravity
chassis and body
Note: Brake calculation acc. EEC regulations
is done by factor h. This centre of gravity
r
is not the same as in a calculation for sus-
pensions, as h means centre of gravity of the
r
complete vehicle and is lower than centre of
gravity height of the suspension.
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trailer axles
Permissible
Centres of Gravity Height
for Air Suspensions
2
centre of gravity
sprung material
All permissible centres of gravity height are based on:
• 0,4g transverse acceleration
• about 3º inclination of body not accounting the tipped limit and
tyre deflection
• about 500mm static radius of tyre for LR/NLR
• about 400mm static radius of tyre for TLR
centre of gravity height will change if tyre is altered
• uniform distributed loads
on the trailer deck for hanging loads and for tankers we
recommend a suspension with thicker springs to cater for
higher centre of gravity e.g.: calculated centre of gravity +20%
All permissible centres of gravity are based on max. capacity of
the suspension. That means that the load on the king pin must be
stabilized by the truck.
The centre of gravity height is the distance between centre of
gravity of sprung material and road.
The sprung material is the total of max. axle load minus unsprung
material.
Unsprung material means axles, rims, tyres, suspension and brake
cylinders.
The percentage of unsprung material to the max. suspension
capacity is about 10%.
Air Suspension 51 / Auto Parts