ZF 8HP transmission

ZF 8HP
Overview
Manufacturer ZF Friedrichshafen
Production 2008–
Body and chassis
Class 8-speed longitudinal automatic transmission
Chronology
Predecessor ZF 6HP
Automatic Transmission 8HP70

The ZF 8HP is an eight-speed automatic transmission, designed and built by ZF Friedrichshafen's subsidiary in Saarbrücken.[1] It had its debut in the new BMW 7 Series (F01) 760Li saloon fitted with the V12 engine, and since then each new BMW model in all Series down to the 1 Series in rear-wheel-drive and all-wheel-drive versions have been equipped with it.

One of its main aims is to improve vehicle fuel economy, and it can achieve an 11% saving compared to the ZF 6-speed transmission and 14% versus modern 5-speed transmissions.[2][3] 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.[4] In the 8HP70 version, it has a torque handling limit of 700 newton metres (516 lbf·ft), and weighs 90 kilograms (198 lb).[5]

Future development will see two four-wheel drive versions available, with a version destined for Volkswagen Group applications using a Torsen centre differential.[5] It will be able to encompass a torque range from 300 newton metres (221 lbf·ft) to 1,000 newton metres (738 lbf·ft), and will be available for use in middle-class cars through to large luxury sport utility vehicles.[5]

Chrysler Group LLC initially received the 8HP 8-speed automatic transmissions from the ZF Getriebe GmbH plant in Saarbrücken, Germany. By 2013, in parallel with Chrysler Group, ZF had set up a new transmission production plant in Indiana, USA, where the 8-speed transmissions are to be produced.[6] ZF Friedrichshafen and Chrysler Group have reached a supply and license agreement for ZF's 8HP 8-speed automatic transmission. Chrysler Group is licensed to produce the 8HP at the company’s Kokomo Transmission Plant and the Kokomo Casting plant, production began in 2013.

2nd generation 8HP products were released starting in 2014. Efficiency improvements over the original design include a wider ratio spread of 7.8:1, reduced drag torque from the shift elements, reduction in required oil pump pressure, and broadened use of the coasting and start-stop systems.[7] ZF estimated fuel economy improvement over 1st generation 8HP kits to be 3%. Refinements were also made with respect to vibration.

Gear ratios

Below is a table of reference gear ratios as provided with the ZF 8HP transmission, though actual implementations may differ depending on the tuning and specifications of individual vehicle manufacturers such as Mercedes Benz, BMW and Audi. Differences in gear ratios have a measurable, direct impact on vehicle dynamics, performance, waste emissions as well as gas mileage.

12345678R
4.7143.1432.1061.6671.2851.0000.8390.6673.300
5.0003.2002.1431.7201.3141.0000.8220.6403.456

List of ZF 8HP variants

Name Max. gasoline torque (N·m) Max. diesel torque (N·m) Application examples
8HP30 300 300 -
8HP45 (a separate 845RE is by Chrysler)[8] 450 500 BMW 1 Series (F20), BMW 3 Series (F30), BMW 5 Series (F10), BMW X4 (F26), Chrysler 300 V6, Dodge Charger V6, RAM 1500 V6 (2013- )
8HP50 (2nd Generation)[9] 500 500 BMW 3 Series (F30 LCI), BMW 5 Series (F10)
8HP55 550 550 Audi Q5, Audi Q7, Audi A8 and A8L (D4)
8HP70 700 700 BMW 7 Series (F01), BMW X5 (E70), Dodge Durango V8, Iveco Daily, Jeep Grand Cherokee V8 & diesel, Ram 1500 V6, V8, & diesel, Range Rover Sport (2012), Rolls-Royce Phantom, Maserati Quattroporte (2013–), Dodge Charger V8 (2015-), Dodge Challenger V8 (2015-), Aston Martin Vanquish (2015), Aston Martin Rapide (2015)
8HP75 (2nd Generation) 750 750 BMW 7 Series (G11/12),[10] BMW X5 (F15)[11]
8HP90 900 1000 Rolls-Royce Ghost,[12] Rolls-Royce Wraith (2013), Bentley Mulsanne, Dodge Challenger SRT Hellcat, Dodge Charger SRT Hellcat, Bentley Bentayga, Audi RS6

Applications

Alfa Romeo

Aston Martin

Audi

Bentley

BMW

Chrysler

Dodge

Iveco

Jaguar

Jeep

Lancia

Land Rover

Maserati

Ram Trucks

Rolls-Royce

Volkswagen

Potential future vehicle uses

See also

References

  1. ↑ "ZF unveils new 8-speed automatic gearbox". PaulTan.org. 3 May 2007. Retrieved 18 September 2009.
  2. ↑ "Fuel saving and minimizing CO2 emissions". ZF Friedrichshafen AG. Retrieved 18 September 2009.
  3. ↑ Mike, Hanon. "ZF Develops 8-Sped automatic". Article. Gizmag.
  4. ↑ "Maximum driving enjoyment with maximum agility". ZF Friedrichshafen AG. Retrieved 18 September 2009.
  5. 1 2 3 "The freedom to exceed limits" (PDF). ZF Friedrichshafen AG. Retrieved 18 September 2009.
  6. ↑ "ZF and Chrysler Reach Agreement for new 8-Speed Automatic Transmissions". Retrieved 10 June 2010.
  7. ↑ "ZF showcasing second-generation 8HP 8-speed transmission at NAIAS; additional 3% boost in fuel savings". Green Car Congress. Retrieved 13 July 2015.
  8. ↑ "New Eight Speed Transmission Introduced by Chrysler". Retrieved 2 September 2011.
  9. ↑ "New Generation of the 8HP in the BMW 5 Series". Retrieved 20 August 2014.
  10. ↑ "2016 BMW 7 SERIES SEDAN: TEUTONIC TECHNOLOGY". Retrieved 24 April 2016.
  11. ↑ "BMW Model Year Actions – July and August 2014". Retrieved 24 April 2016.
  12. ↑ "RR ghost specification". Retrieved 21 February 2010.
  13. ↑ "New vehicles with ZF technology". Retrieved 18 June 2011.
  14. ↑ "New vehicles with ZF technology". Retrieved 18 June 2011.
  15. ↑ "Audi Considering 8-Speed Transmissions for Majority of Its Lineup". Retrieved 17 February 2010.
  16. ↑ "First Full Hybrid Based on the Audi Q5's ZF 8-Speed Automatic Transmission". Retrieved 14 September 2011.
  17. ↑ "America’s First Luxury Sedan With Eight-speed Automatic Transmission". Retrieved 5 September 2011.
  18. ↑ "2012 Chrysler Fleet Buying Guide" (PDF). Retrieved 21 July 2011.
  19. ↑ "SEC filing reveals new V6 and 8-speed transmission for Ram". Retrieved 9 March 2012.
  20. ↑ "2014 Dodge Durango Bows With Eight-Speed". Retrieved 28 March 2013.
  21. ↑ "ON TOUR WITH MORE COMFORT ZF DELIVERS 8-SPEED AUTOMATIC TRANSMISSION FOR NEW IVECO DAILY". Retrieved 16 November 2014.
  22. ↑ "2014 Maserati Quattroporte [w/video]". Retrieved 12 December 2012.
  23. ↑ "2013 Ram 1500 Unveiled With Eight-Speed". Retrieved 5 April 2012.
  24. ↑ "ZF to Supply 8-Speed Automatic Transmission to new 2013 Ram 1500 Pick-up Truck". ZF Friedrichshafen AG. Retrieved 20 April 2012.
  25. ↑ "2013 Ram 1500 Crew Cab SLT 4x4 [w/video]". Autoblog.com. Retrieved 25 August 2012.
  26. ↑ "Volkswagen Amarok With 8-Speed Automatic Transmission" (PDF). Retrieved 9 November 2015.

External links

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