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ZF 8HP transmission

The ZF 8HP transmission is ZF Friedrichshafen AG's trademark name for its 8-speed automatic transmission models for longitudinal engine applications. The name is short for 8-speed transmission with hydraulic converter and planetary gearsets. Designed and first built by ZF's subsidiary in Saarbrücken, Germany, it debuted in 2008 on the BMW 7 Series (F01) 760Li sedan fitted with the V12 engine. BMW remains a major customer for the transmission.

Another major customer is Stellantis, who both received a license to produce the transmission and set up a joint-venture plant with ZF. Stellantis has built the transmission at its Kokomo Transmission plant since 2013 under their own brand name, the Torqueflite 8.[1][2] The joint venture plant in Gray Court, South Carolina opened in 2012.[3]

Specifications

Layout

One of the main aims of the ZF 8HP transmission is to improve vehicle fuel economy with extra speeds. Compared to the six-speed ZF 6HP transmission it uses 12 % less fuel, and 14 % less than a 5-speed transmission.[4][5] Due to changes in internal design, the shift times have reduced to 200 milliseconds; additionally, the unit brings the ability to shift in a non-sequential manner – going from gear 8 to gear 2 in extreme situations.[6] In the 8HP 70 version, it has a torque handling limit of 700 N⋅m (516 lb⋅ft), and weighs 87 kg (192 lb).[7]

First generation 8HP products were released starting in 2010. In addition to the rear-wheel drive variant, two different four-wheel drive versions were available, with a version destined for Volkswagen Group applications using a Torsen centre differential.[8] It is able to encompass a torque range from 300 N⋅m (221 lb⋅ft) to 1,000 N⋅m (738 lb⋅ft), and is available for use in middle-class cars through to large luxury sport utility vehicles.[8]

Second generation 8HP products were released starting in 2014. Efficiency improvements over the original design and the first generation include a wider ratio spread of 7.81, reduced drag torque from the shift elements, reduction in required oil pump pressure, and broadened use of the coasting and start-stop systems.[9] ZF estimated fuel economy improvement over first generation 8HP kits to be 3 %. Refinements were also made with respect to vibration.

Third generation 8HP products were released starting in 2018. Major improvements are total spread of 8.59 and a fuel economy improvement of 2.5 % compared to the second generation. There are several options in maximum torque available, also the gearbox is available with mild hybrid and plug in hybrid options: With 15 kW (20 hp) and 200 N⋅m (148 lb⋅ft) supporting boosting and recuperation in combination with 48 Volt technology up to 90 kW (121 hp) and 250 N⋅m (184 lb⋅ft) for usage with higher voltage.[10]

  1. ^ Differences in gear ratios have a measurable, direct impact on vehicle dynamics, performance, waste emissions as well as fuel mileage

Variants and Applications

  1. ^ without any claim of completeness

See also

References

  1. ^ Duane, Salerno (25 April 2019). "Reviewed: Chrysler Group's 8 speed automatic transmission". salernoduanesummit.com. Retrieved 10 May 2019.
  2. ^ "Ram ZF 8 Speed Automatic Transmission TorqueFlite 8 ZF 8HP70". 29 September 2014. Archived from the original on 15 December 2021. Retrieved 10 May 2019 – via YouTube.
  3. ^ "ZF and Chrysler Reach Agreement for new 8-Speed Automatic Transmissions". Retrieved 10 June 2010.
  4. ^ "Fuel saving and minimizing CO2 emissions". ZF Friedrichshafen AG. Archived from the original on 19 July 2009. Retrieved 18 September 2009.
  5. ^ Mike, Hanon (4 May 2007). "ZF Develops 8-Sped automatic". Gizmag.
  6. ^ "Maximum driving enjoyment with maximum agility". ZF Friedrichshafen AG. Retrieved 18 September 2009.
  7. ^ "8-Speed Automatic Transmission". ZF Friedrichshafen AG. Retrieved 19 September 2016.
  8. ^ a b "The freedom to exceed limits" (PDF). brainfunkers.co. ZF Friedrichshafen AG. Retrieved 7 January 2020.
  9. ^ "ZF showcasing second-generation 8HP 8-speed transmission at NAIAS; additional 3% boost in fuel savings". Green Car Congress. Retrieved 13 July 2015.
  10. ^ "Transmission technology from ZF" (PDF). ZF.com. Retrieved 20 February 2018.
  11. ^ a b c d "8HP 70 Repair Manual · Picture 10106" (PDF). 2014. p. 110.
  12. ^ a b "Timur Apakidze · Saturation Dive: ZF 8-Speed Automatic". TTAC: The Truth About Cars. 11 March 2014. Retrieved 7 July 2019.
  13. ^ a b "8HP 55A Repair Manual · Picture 10106" (PDF). 2014. p. 169.
  14. ^ a b c d e f g h i 2nd Generation and 3rd Generation "Efficient And Dynamic · ZF Gearbox Brochure" (PDF). 1 September 2017. Retrieved 7 July 2019.
  15. ^ "Der neue BMW M760 Li xDrive. Technische Daten" [The new BMW M760 Li xDrive. Technical data]. www.press.bmwgroup.com (in German). January 2017.
  16. ^ "Technical Data: ALPINA Automobiles".
  17. ^ a b c "Specifications of the all-new BMW 3 Series Sedan, valid from 03/2019".
  18. ^ "Technical Data: ALPINA Automobiles".
  19. ^ "Technical Data: ALPINA Automobiles".
  20. ^ a b "Durable and fast – ZF Race Transmissions" (PDF). www.zf.com.
  21. ^ "PowerLine > Powershift Transmission - ZF".
  22. ^ "ZF PowerLine - 8 Speed Automatic Transmission" (PDF). www.zf.com.
  23. ^ "Product Overview - Transmission & E-Mobility Driveline Systems for Trucks & Vans" (PDF). www.zf.com. p. 7.
  24. ^ a b "Data Sheet - PowerLine" (PDF). www.zf.com.
  25. ^ a b Efficient Torque Converter Automatic Transmission for Commercial Vehicles (ZF 8AP) · Winfried Gründler · Herbert Mozer · Frank Sauter: ATZ worldwide 06/2017 · pp. 36–39
  26. ^ "The New Driving Experience - 8-speed automatic transmission ZF-PowerLine" (PDF). www.zf.com.
  27. ^ "New Eight Speed Transmission Introduced by Chrysler". Retrieved 2 September 2011.
  28. ^ "America's First Luxury Sedan With Eight-speed Automatic Transmission". Retrieved 5 September 2011.
  29. ^ "2012 Chrysler Fleet Buying Guide" (PDF). Retrieved 21 July 2011.
  30. ^ a b c d e "SEC filing reveals new V6 and 8-speed transmission for Ram". Retrieved 9 March 2012.
  31. ^ a b c d e "2014 Dodge Durango Bows With Eight-Speed". Retrieved 28 March 2013.
  32. ^ a b c "2013 Ram 1500 Unveiled With Eight-Speed". Retrieved 5 April 2012.
  33. ^ a b c "ZF to Supply 8-Speed Automatic Transmission to new 2013 Ram 1500 Pick-up Truck". ZF Friedrichshafen AG. Retrieved 20 April 2012.
  34. ^ a b c "2013 Ram 1500 Crew Cab SLT 4x4 [w/video]". Autoblog.com. Retrieved 25 August 2012.
  35. ^ Audi. "Audi 8-speed to replace 6-speed automatic across most of range". Motor1.com. Retrieved 4 February 2020.
  36. ^ a b c "Getriebekatalog Abfrage – Technische Daten –" (PDF). zfservis.sk. Retrieved 21 August 2021.
  37. ^ a b "Aston Martin Automatic Gearboxes". JT Automatics Ltd. Archived from the original on 25 April 2016.
  38. ^ "On Tour With More Comfort ZF Delivers 8-Speed Automatic Transmission for New Iveco Daily". Retrieved 16 November 2014.
  39. ^ "2014 Maserati Quattroporte [w/video]". Retrieved 12 December 2012.
  40. ^ "RR ghost specification". Retrieved 21 February 2010.
  41. ^ "New Generation of the 8HP in the BMW 5 Series". Retrieved 20 August 2014.
  42. ^ a b 8HP 75 Data Sheet · p. 4 · Saarbruecken 2016
  43. ^ "2016 BMW 7 Series Sedan: Teutonic Technology". 24 September 2015. Retrieved 24 April 2016.
  44. ^ "BMW Model Year Actions – July and August 2014". Retrieved 24 April 2016.
  45. ^ "New vehicles with ZF technology". Retrieved 18 June 2011.
  46. ^ "New vehicles with ZF technology". Retrieved 18 June 2011.
  47. ^ "BMW ALPINA B7 Long-wheelbase AWD Technical Data". Retrieved 10 May 2019.

External links