![]() Therefore, all 8HP automatic transmissions feature particularly advanced torsional vibration dampers: These dampers eliminate the vibrations that occur on the engine side in a particularly effective manner so that they are unable to move further along and into the driveline and the body. Another positive effect is that the oil pump belonging to the ZF automatic transmission works with a system pressure that has been reduced from 5 to 3.5 bar and, as a result, requires less energy overall.įurthermore, the objective was to take the changing vibration behavior of the increasingly economical yet, at the same time, more powerful downsizing units into account. "Consequently, it is no longer necessary to 'brake' against the drive," explains Jürgen Greiner. Meanwhile, a further innovative function minimizes the creeping torques: A clutch is now fully opened during deceleration and when the vehicle is stationary. ![]() This is primarily ensured by the new multidisk separation: Additional springs integrated into the multidisk packages of the shift elements ensure that the friction shift elements are almost fully opened and, consequently, cause less drag torque. Jürgen Greiner, head of Passenger Car Transmission Development at ZF Friedrichshafen AG.įurthermore, the ZF developers have succeeded in once again reducing the internal transmission losses. "This measure alone reduces the speed across all gears by 50 revolutions per minute on average and reduces fuel consumption by almost one percent," explains Dr. It is the reduction of the speeds in particular that demands transmissions with a higher spread which is the reason why ZF has increased it from 7.0 to 7.8 on the new 8HP by means of optimized gearsets.
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