Jeep Grand Cherokee Greenville Sc

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The ZF 9HP is a nine-speed automatic transmission built by ZF Friedrichshafen AG subsidiary ZF Transmissions in Gray Court, South Carolina. It is a front-transverse transmission, used in front-wheel drive and all-wheel drive vehicles. ZF claims that it is able to save an average of 16% in fuel compared with current 6-speed automatic transmissions. The gear ratio spread is 9.81:1. The transmission has a torque range between 280 and 480 Nm.

The 9HP is only 0.24 inches (6mm) longer than, and weighs 16.5 lbs (7.5 kg) less than, the outgoing six-speed transmission. The compact packaging is achieved by using a number of innovative design features: a new compact hydraulic vane-type pump, two patented dog clutches, which replace bulkier conventional clutch packs, and a nested gear set.

Land Rover and Jeep demonstrated the world's first nine-speed automatic transmissions for passenger cars at the 2013 Geneva Motor Show. The 2014 Jeep Cherokee featured the world's first nine-speed automatic transmission for a passenger vehicle to market. The transmission has been problematic, as customers of Jeep, Chrysler, and Acura models equipped with the transmission have experienced problems in their vehicles regarding slow shifting and noisy operation. ZF has said this is due to software problems, not mechanical issues.


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How It Works

An Animated Drive Line Schematic & A Rotational Speeds Nomogram

These ordinates are positioned on the abscissa in strict accordance with the proportions of the sun gears' teeth numbers relative to those of their rings. Consequently, the output ratios on the ordinate C4 (carrier of the last planetary gearset RS4) follows closely to those of the actual transmission. Note that elements A and F are labelled interchanged (cf. legend below).


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9HP Nomogram

? Interactive Nomogram

This interactive nomogram is a real geometric calculator exactly representing the rotational speeds of the transmission's 3x4 = 12 internal shafts for each of its 9 ratios (+ reverse), grouped according to their 5 permanent coupling on 4 joint ordinates and 3 independent ordinates. These ordinates are positioned on the abscissa in strict accordance with the proportions of the sun gears' teeth numbers relative to those of their rings. Consequently, the output ratios on the 6th ordinate (carrier of the fourth planetary gearset) follows closely those of the actual transmission. This advantageous geometric construction sets us free from Willis' famous and tedious formula, because all calculations are exclusively determined by lengths ratios, respectively teeth numbers on the abscissa for the 4 epicyclic ratios, and of rotational speeds on the 6th ordinate for the 10 gear ratios.

Legend:
A : Dog Clutch (couples r1+s2 with input shaft)
B : Clutch (couples s1 with input shaft)
C : Brake (blocks s1 sun gear)
D : Brake (blocks r2 ring gear)
E : Clutch (couples c3+r4 with input shaft)
F : Dog Brake (blocks s3+s4 sun gears)


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Gear Ratios


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List of ZF 9HP variants


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Applications

Acura

  • TLX (V6 models only)
  • MDX (2016- models)

Chrysler

  • Chrysler 200
  • Chrysler Pacifica minivan (gasoline-only version)

FIAT

  • Fiat Doblò 2015-on
  • Fiat 500X
  • Fiat Toro

Honda

  • CR-V (2015-on European model, diesel)
  • Pilot (2016- [optional, 6-speed automatic standard])
  • Avancier (2016- 370TURBO models only])
  • Odyssey (2018- [standard, 10-speed automatic optional])

Jeep

  • Jeep Cherokee (KL)
  • Jeep Renegade
  • Jeep Compass (MP)

Ram Trucks

  • Ram ProMaster City

Land Rover

  • Range Rover Evoque
  • Land Rover Discovery Sport

Jaguar

  • Jaguar E-Pace

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Future applications

  • Fiat Chrysler Automobiles transverse mounted engines
    • Dodge Dart
    • Fiat Tipo

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Recalls

Some of the cars utilizing the ZF 9HP have been plagued with problems, resulting in TSBs (Technical Service Bulletins) being issued for the Jeep Cherokee and transmission-related recalls for the Acura TLX.

  • TLX transmission recall

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Production

Production of the 9HP started in 2013 at ZF's Gray Court facility in Greenville, South Carolina. 400,000 units are produced per year.

Production of the 9HP for Fiat and Chrysler vehicles began in May 2013 at Indiana Transmission Plant I (ITPI), followed by Tipton Transmission Plant in Tipton County, Indiana in May 2014.

Source of the article : Wikipedia



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