Multi-ratio automatic transmissions

Function & Benefit

• Fast acceleration because ZF automatic transmissions change gear with minimal interruption to traction.
• Cost-effective driving because ZF automatic transmissions always operate in the most fuel-efficient engine speed range.
• Safe and comfortable because automatic transmissions reduce the stresses and strains of road traffic significantly, e.g. in city traffic and when parking.

By virtue of the complete range of products ZF is able to supply, the automatic transmission is now establishing itself firmly across the board, even at the lower end of the mid-range sector and compact class. An overview of 6 and 8-speed transmissions provides you with some information about the range and variety of ZF products available.

6-speed automatic transmissions for cars

The 6-speed automatic transmission for RWD and 4WD vehicles is truly state-of-the-art, and can accommodate power ratings of up to 1000 Nm. Close ratio steps make the transmission more responsive to the torque characteristics of the engine. The electronic transmission control unit can be networked via a CAN bus to the engine control unit, and to dynamic, brake and stabilization systems employed for dynamic drive management tasks.

Marvel of innovation with 8 gears

ZF has developed a new automatic car transmission with eight speeds that can achieve 11% fuel savings. The priority aim in development, however, was not the maximum number of gears, but minimum consumption.

Several innovations have been introduced in the new 8HP to reduce fuel consumption: the completely new transmission concept with four gear sets and only two shift elements open, a higher overall gear ratio, a variable oil pump, new torque converter, and optimized hydraulic and transmission control. Also available as an optional add-on is a stop/start function that automatically cuts out the engine when the vehicle stops and restarts it when the brake is released.

With the start/stop function of the hydraulic impulse oil storage, it is possible to reduce fuel consumption by another 5%. Compared with the worldwide most efficient 6-speed automatic transmission by ZF, the newly developed 8-speed automatic transmission saves another 11%.

Technical Data

You will find detailed technical information and data sheets in English or German language on zf.com/MultiRatioAutomatic .