Jeep WK2 Grand Cherokee 8HP-75 8-Speed Transmission

By Jeep Experts

New 2nd era ZF 8-speed Transmission

  • New gear set design: 4 planetary gear units and solely 5 shift parts decrease the drag loss and improve the transmission effectivity
  • Optional hydraulic impulse oil storage (HIS) opens up the opportunity of the start-stop operate and will increase the gasoline financial savings potential
  • Integrated transmission management unit with extraordinarily fast response time
  • Basic transmission might be mixed with a number of energy take-up parts together with the torque converter, the hybrid drive, and the built-in energy take-up factor
  • Full hybrid compatibility: on the premise of the parallel hybrid idea, delicate, full and plug-in hybrid techniques might be carried out with the essential transmission of the 8-speed automated transmission
  • The transmission is suitable with the next all-wheel-drive ideas: All-whell drive middle differential built-in, built-in all-wheel drive system (IAS©), hang-on all-wheel-drive
  • Input torque 750 newton meter (553 lb-ft.)
  • Multidisk separation of brakes
  • Optimized cooling: much less cooling oil for low system pressures, extra cooling oil for top system pressures
  • Automatic idle shift system at automobile standstill and engaged service break (stand-by management)

One transmission – many prospects

For the 8-speed automated transmission, ZF got down to design and develop a completely new gear set idea. The result’s a revolution in transmission design: a transmission idea with 4 gearsets which requires solely 5 shift parts – of which solely two are open in any given gear. The 8HP additionally requires not more than 3 multi-disk clutches and a couple of brakes, which permits it to realize a better diploma of effectivity than different ideas. As a results of the truth that solely 2 shift parts are open per gear, drag losses within the transmission are sustainably decreased. This impact is supported by way of a brand new parallel-axis vane-type oil pump. 4 A torque vary from 300 to 1000 newton meter makes the 8HP the right companion for all rear-wheel-drive and all-wheel-drive designs. From the decrease midsize section to sporty luxurious automobiles, and in each sort of SUV and offroad automobile – its revolutionary design is all the time an environment friendly and economical resolution. Although the 8HP options 2 extra speeds than the extraordinarily profitable 6HP, the scale have remained unchanged and the load was even decreased by 3% to 87 kg (transmission modular system 8HP70) together with oil. At the identical time, the overall transmission ratio unfold of seven.0 ensures that the engine is all the time in its optimum working vary. This interprets into improved acceleration and decreased gasoline consumption.

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Based on a very profitable product, it combines dynamics and luxury with improved effectivity – additionally with regard to the prices. And it’s ideally outfitted for even stricter gasoline consumption and CO2 emission rules. In the premium and mid-size automotive vary, the optimized 8HP product household allows the typical gasoline consumption to be reduce by one other 3%. CO2 emissions lower to the identical extent. These potentials can be fully transferred to hybrid drives. Incidentally, further financial savings potential by an extra optimized startstop operate will not be but included right here. To obtain these improvements, ZF engineers have optimized some particulars. Thus, the discount of drag torques and engine speeds additional decreased the already very low energy losses. Essential success features are the upper transmission ratio unfold and the discount of system pressures in lots of areas. Another issue is the multidisk separation of the brakes. Furthermore, superior torsional vibration dampers allow a quicker bypassing of the hydrodynamic energy transmission and subsequently additional discount in velocity. Thus, the brand new 8HP is completely ready to be used with the brand new engines (3-8 cylinders) which is able to decide the pattern of the years-to-come.

8HP75 Data Sheet (PDF)

–WK2Jeeps.com

 

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