Page 55 - BPW axles with air suspension Series O SL AL

Raising and Lowering 12.2

S Sttrrookkee lliimmiittaattiioonn
The spring deflection is limited by a rubber stop in-
side the air bag. Under certain operating conditions
the rebound travel must be limited.

A Aiirr bbaagg TTyyppee 3366--11,, 3366--55 oorr 3366--22

Stroke limiting is required in vehicles with a lifting
and lowering device and type 36-1, 36-5 or 36-2 air
bags.

A Aiirr bbaagg TTyyppee 3300 KK,, 3300,, 3366 KK oorr 3366

As a rule, no stroke limiting is required when type
30 K, 30, 36 K or 36 air bags are used.

R Raappiidd uunnllooaaddiinngg
With vehicles where the payload is unloaded quick-
ly, e.g. tippers, container vehicles, coil vehicles etc.,
stroke limitation is required by means of check
straps or rapid venting of the air bags.

C Crraannee,, rraaiillwwaayy oorr sshhiipp llooaaddiinngg

With vehicles for crane, railway or ship loading,
BPW recommends air bags with a split piston, sys-
tem Kombi Air bag II. If not expressly demanded in
the technical documentation, no stroke limitation is
needed when the Kombi Air bag is used.

S Sttrrookkee lliimmiittiinngg vveerrssiioonnss

1. The stroke limitation can be carried out via an air
levelling valve with integrated shut-off (fig. Page
53) or a separate shut-off valve. The shut-off
Catch straps valve is fixed to the vehicle frame and the valve
plunger is connected to the axle via a spring.
After the maximum stroke is achieved, the air
supply to the air bags is interrupted in order to
limit the length of the stroke.
170
10 2. Stroke limitation can also be carried out via catch
straps. When installing, ensure that they do not
rub against the axle beam.
~ 32
Depending on the version, the limiting function is in
the shock absorbers in axles with a lifting and low-
ering device without stroke limiting by shut-off
valves or catch straps. The shock absorbers are
Axle centre
equipped with a travel limiter; however they are not
designed to operate with airbag pressures above
DIRECTION OF TRAVEL
approx. 8.5 bar.

BPW-EA-Luft 1023701e 55