trucks have some form of auxiliary brakes. For almost two decades Scania’s
customers have been able to appreciate just how powerful, yet smooth, effect a
hydraulic retarder from Scania can provide. Besides comfort and a relaxing
drive, it also provides savings by reducing the need for normal brake system
maintenance. In this latest version, the retarder automatically disengages and
freewheels when not in use to save on fuel. And it is now even more powerful
to a company statement, one of the Scania Retarder models is now available in a
new version (R4100D) that automatically disengages and enters a freewheeling
mode when not active. This reduces drag losses because both vaned wheels that
provide braking power when rotating in oil are disengaged. Actual fuel savings
will vary depending on road conditions, but an average of a half percent
reduction is taken as the rule of thumb.
driver doesn’t have to do anything. When braking power is needed, the
freewheeling stops and the engagement takes place smoothly and immediately
using a type of synchronisation that is similar to that in Scania gearboxes.
Besides not requiring any energy, the freewheeling retarder also provides
higher braking power, 4,100 Nm instead of 3,500 Nm, as well as an increased
braking effect at lower engine rpm with the help of higher gear ratios.
fuel consumption is Scania’s main priority,” says Örjan Åslund, responsible for
Product Affairs at Scania Trucks. “The freewheeling retarder produces further savings
that also contributes to an elevated driving experience.”
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