Intarder

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A Intarder (composition of integrated and retarder ) is one of ZF developed, wear-free hydrodynamic retarder brake for trucks and buses , which is largely a function in their retarder like. The intarder is also called a secondary retarder.

The main difference to the retarder, which is usually flanged to the outside of the gearbox and can also be freely positioned in the drive train (for example in front of the rear axle differential or in trailers / semi-trailers , then usually as an electrodynamic retarder ), the intarder is at least partially integrated in the gearbox, with the it has a common oil supply and it dissipates the heat via its cooling water circuit. The intarder is essentially a hydrodynamic coupling (similar to a torque converter from the automatic transmission ), consisting of a housing with a centrifugal pump ( rotor ) driven from the transmission output via a gear ratio and a turbine wheel ( stator ) - here stationary . For braking, a quantity of oil depending on the desired braking force is pumped into the housing, which flows alternately through the pump and turbine, whereby a strong braking torque acts on the pump. The oil heats up and the braking torque is in turn transferred to the output flange of the gearbox.

The braking effects of the intarder can vary depending on the engine speed. The braking effect is usually better at higher speeds. An Intarder can also be made more compact, as it manages with smaller turbine wheels that generate higher speeds than the cardan shaft. At the retarder manufacturer Voith , they are also called "inline retarders" and are attached directly to the transmission. A further development is the Pritarder , which is installed on the transmission input side from MAN or Aquatarder from Voith, which work with cooling water and weighs just 32 kg compared to an Intarder with up to 150 kg.

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