The BRG10-50 bevel reduction gearbox transforms a rotational movement into
a push-pull movement. The reduction gearbox is always positioned close to
the rudder stock. Via a draglink with rose joints, the push-pull movement
is transmitted to the tiller lever and rudder shaft. The BRG10-50 has
a gear reduction of 5:1. This results in 1.8 revolutions of the input
shaft for a corresponding 72 degrees of rudder travel. This can be
increased with steps of 1.2:1 by using step ratio bevel boxes (2.2 turns
with one step ratio and 2.7 turns with two step ratio bevel boxes). The output
lever centres are 130 mm to a corresponding 200 mm centres of the tiller
lever. This difference in length results in the so called "wide angle
geometry". Please click here for more in
depth explanation.
The maximum input torque is 40.5 KgfM resulting in a maximum rudder torque
of 591 KgfM. The maximum rudder torque according to the CE rating is 208 KgfM midships and
394 KgfM full rudder (the CE regulations use a safety
factor of 150%). This makes the gearbox suitable for boats from 30' to
around 48'. Except for the input shaft and the gears, the complete
gearbox is machined out of solid aluminium 6082 for maximum strength and minimum
weight. Positioning the reduction gearbox correctly to the
rudderstock is very important for the wide angle geometry to function
correctly. Please look at the mounting examples at the bottom of this
page. Please click on the picture for a
larger view. |
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