Page 11 - Catalog spare parts BPW brake disc

Auto Parts / Page 10 BPW-EL-TSB 31231601e
2 Steering axle, steering lock

General

BPW Steering axles series LL
No one wants to loose rubber from their tyres every time
they turn a corner. So we’ve developed an axle which
allows your tyres to roll instead of slide.
The BPW LL self-steering axle.
The enormous advantages of the steering axle come
to the fore when manoeuvring: Better manoeuvrability,
reduced wear on all tyres and less fuel consumption.
As a result, the BPW self-steering axle is the right
economical solution for delivery and distribution traffi c
chiefl y consisting of journeys in congested conurbations
and cities.

Function
LL stands for “load-dependent steering stabilisation”
and it describes the unique functional principle of the
BPW self-steering axle.

Conventional steering axle designs require steering
stabilisers powered from an external source – this is not
the case with the BPW self-steering axle. The axle beam
and axle stub are connected to undulating thrust bearings
via steering pivots.
When driving straight ahead (zero position), the
undulations in the thrust washers keep the wheels on
track. The weight of the vehicle presses the undulating
contours of the upper and lower thrust washers together.
The wheels remain stable in the correct straight-ahead
position.
When the semi-trailer follows the tractor unit into a
curve, the wheel castor action ensures the wheels turn
in accordance with the curve radius (the thrust washers
slide over one another).
The frictional resistance changes according to the load
on the axle. As a result, a steering angle (of 8 to 27°,
depending on the axle type) is achieved according to the
load, and is entirely controlled by mechanical means.
The link connecting the wheels uses a steering lock to
prevent the wheels from steering when the vehicle is
reversing.

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