Page 42 - BPW axles with air suspension Series O SL AL

BPW axles with air suspension

8 Shock absorber

G Geenneerraall
The purpose of shock absorbers is to rapidly redu-
ce the vibrations occurring between the axle and
body during driving. This prevents any further
yawing of the body and running gear components,
and ensures that the tyres maintain optimum
ground contact. In turn, this ground contact is
responsible for the tracking stability and braking
properties of the vehicle.

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BPW shock absorbers operate according to the
twin-tube principle. In the compression stage (cor-
responding to upward travel), the oil is pressed into
the working space at the top, which then flows
back into the working space at the bottom during
the rebound travel (corresponding to downwards
movement). The built-in valves produce the requir-
ed damping characteristics.
L max.
BPW shock absorbers are matched to the vehicle,
ride height, installation position and range of appli-
cations. For air suspension systems with split
pistons (combination air bag and Airlight Direct ), the
shock absorbers are provided with an end stop to
prevent further lowering of the axles.

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Shock absorbers may be arranged in different ways
depending on the version:

- On the side next to the air suspension hanger
bracket (towards the middle of the axle next to
the trailing arms)
- Centrally in relation to the air suspension hanger
brackets above the trailing arms
The shock absorbers are attached using hexagonal
bolts or weld-on threaded bolts with lock nuts.
Depending on the version, it may be necessary to
use additional rings, discs and sleeves for installa-
Lateral Central tion.
arrangement arrangement
The following depictions provide an overview of the
current versions.

Tightening torques, see last page.

42 BPW-EA-Luft 1023701e