The float axle
SA, consisting of a tube mounted on bearings located in
the main hull, pivots together with the float around a vertical line a.
|also pivots around a horizontal axis
at the lower end of the vertical axis. This pivoting axis
is represented by line b in the cross section and point B
in the longitudinal section. The corresponding bearings
are found in the float. The vertical axle is mounted on
two sets of bearings in the main hull. Radial forces are
transferred to the bottom of the main hull by a
cylindrical roller bearing. At the top, both radial and
axial forces are absorbed by a cone roller bearing mounted
at the roof. A spherical roller bearing allows the float
to pivot around the horizontal axis. This bearing
transfers mostly axial force (weight of the main hull) but
also some radial force (i.e. caused by waves impacting
from the side). This is facilitated by having the vertical
axle end at the bottom in a transversely mounted cylinder.
A segment of the spherical roller bearing is sufficient
for this purpose, since the float is only able to deviate
from the horizontal position by a maximum of 30°.
Several gearwheels connected to the bearing (not shown in
the drawing) ensure that this roller segment remains
centred beneath the vertical axis when the float is in the
horizontal position. A number of rollers with rigid axes
are additionally mounted at the upper part of the float in
order to transfer radial forces (see cross section) The
bearings are sealed at the float by means of a rubber
sleeve GM and at the bottom of the main hull by means of a
radial drag seal made of rubber. The rollers of the
bearings are made of teak impregnated with paraffin (which
serves as a lubricant and prevents water absorption).