9HP is

ZF Friedrichshafen AG ZF Friedrichshafen AG, also known as ZF Group, originally ''Zahnradfabrik Friedrichshafen'', and commonly abbreviated to ZF (ZF = "Zahnradfabrik" = "Cogwheel Factory"), is a German car parts maker headquartered in Friedrichshafen, in the south- ...

trademark A trademark (also written trade mark or trade-mark) is a type of intellectual property consisting of a recognizable sign, design, or expression that identifies products or services from a particular source and distinguishes them from others ...

name for its nine-speed

automatic transmission An automatic transmission (sometimes abbreviated to auto or AT) is a multi-speed transmission used in internal combustion engine-based motor vehicles that does not require any input from the driver to change forward gears under normal driving c ...

models (9-speed transmission with Hydraulic converter and Planetary gearsets) for

transverse engine A transverse engine is an engine mounted in a vehicle so that the engine's crankshaft axis is perpendicular to the direction of travel. Many modern front-wheel drive vehicles use this engine mounting configuration. Most rear-wheel drive vehicles ...

applications, designed by ZF's subsidiary in

Saarbrücken Saarbrücken (; french: link=no, Sarrebruck ; Rhine Franconian: ''Saarbrigge'' ; lb, Saarbrécken ; lat, Saravipons, lit=The Bridge(s) across the Saar river) is the capital and largest city of the state of Saarland, Germany. Saarbrücken is S ...

and built in Gray Court, South Carolina. It is used in

front-wheel drive Front-wheel drive (FWD) is a form of engine and transmission layout used in motor vehicles, where the engine drives the front wheels only. Most modern front-wheel drive vehicles feature a transverse engine, rather than the conventional longit ...

and

all-wheel drive An all-wheel drive vehicle (AWD vehicle) is one with a powertrain capable of providing power to all its wheels, whether full-time or on-demand. The most common forms of all-wheel drive are: ;1x1 : All unicycles Reflecting one axle with one w ...

vehicles.

Abstract

Land Rover Land Rover is a British brand of predominantly four-wheel drive, off-road capable vehicles, owned by multinational car manufacturer Jaguar Land Rover (JLR), since 2008 a subsidiary of India's Tata Motors. JLR currently builds Land Rovers ...

and

Jeep Jeep is an American automobile marque, now owned by multi-national corporation Stellantis. Jeep has been part of Chrysler since 1987, when Chrysler acquired the Jeep brand, along with remaining assets, from its previous owner American Moto ...

demonstrated the world's first nine-speed automatic transmissions for passenger cars at the 2013

Geneva Motor Show The Geneva International Motor Show is an annual auto show held in March in the Swiss city of Geneva. The show is hosted at the Palexpo, a convention centre located next to the Geneva Cointrin International Airport. The Salon is organised by th ...

. The 2014 Jeep Cherokee featured the world's first nine-speed automatic transmission for a passenger vehicle to market.

Specifications

Basic Concept

The 9HP is only 0.24 inches (6 mm) 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 clutch A dog clutch (also known as a positive clutch or dog gears) is a type of clutch that couples two rotating shafts or other rotating components by engagement of interlocking teeth or dogs rather than by friction. The two parts of the clutch are d ...

es, which replace bulkier conventional clutch packs, and a nested gear set. 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 9.8085:1. The transmission has a torque range between 280 and 480 Nm.

Technical data

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).

9HP Nomogram

▶️ Interactive Nomogram
br />
This interactive

nomogram A nomogram (from Greek , "law" and , "line"), also called a nomograph, alignment chart, or abac, is a graphical calculating device, a two-dimensional diagram designed to allow the approximate graphical computation of a mathematical function. ...

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 common usage, the abscissa refers to the (''x'') coordinate and the ordinate refers to the (''y'') coordinate of a standard two-dimensional graph. The distance of a point from the y-axis, scaled with the x-axis, is called abscissa or x coo ...

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 fro
Willis'
famous and tedious formula, because all calculations are exclusively determined by lengths ratios, respectively teeth numbers on the

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)

List of ZF 9HP variants

Applications

Acura

TLX Nuclear receptor TLX (homologue of the Drosophila tailless gene) also known as NR2E1 (Nuclear receptor subfamily 2 group E member 1) is a protein that in humans is encoded by the ''NR2E1'' gene. TLX is a member of the nuclear receptor family of ...

(V6 models, 2015–2020) * MDX (2016–2020, non-hybrid models)

Alfa Romeo

Alfa Romeo Tonale The Alfa Romeo Tonale (Type 965) is a compact crossover SUV produced by Italian car manufacturer Alfa Romeo. Introduced in February 2022, the Tonale is the first hybrid-powered Alfa Romeo. It slots below the Alfa Romeo Stelvio and became the fir ...

2.0T engine

Chrysler

Chrysler 200 The Chrysler 200 is a mid-size sedan that was manufactured and marketed by Chrysler from model years 2011 to 2017 across two generations in four-door sedan and two-door convertible (first generation only) body styles. The 200 nameplate debuted ...

* Chrysler Pacifica/Voyager minivan (gasoline version)

FIAT

* Fiat Dobló/RAM Promaster City 2015-on *

Fiat 500X The Fiat 500X (Type 334) is a subcompact crossover SUV manufactured and marketed by Stellantis (formerly Fiat Chrysler Automobiles), since its debut at the 2014 Paris Motor Show. Following the 500L, and produced from 2014 (from 2016 model year ...

Fiat Toro The Fiat Toro is a pickup truck made by Fiat in Brazil. It is derived from the Fiat FCC4 Concept and is based on the Small Wide 4×4 architecture shared with the Jeep Renegade, Jeep Compass, and the Fiat 500X. In several markets in Latin America ...

Fiat Ducato The Fiat Ducato is a light commercial vehicle jointly developed by FCA Italy and PSA Group (currently Stellantis), and mainly manufactured by Sevel, a joint venture between the two companies since 1981. It has also been sold as the Citroën C25, ...

2020

Opel/Vauxhall

Opel Astra The Opel Astra is a compact car/small family car (C-segment) developed and produced by the German automaker Opel since 1991, currently at its sixth generation. It was first launched in September 1991 as a direct replacement to the Opel Kadet ...

(2020; Diesel Engine) *

Opel Insignia The Opel Insignia is a large family car (D-segment in Europe) developed and produced by the German car manufacturer Opel since 2008. Taking its name from a 2003 concept car, the model line serves as the flagship Opel car line, slotted above the ...

(2020; Diesel Engine)

Honda

CR-V The Honda CR-V (also sold as the Honda Breeze in China since 2019) is a compact crossover SUV manufactured by the Japanese automaker Honda since 1995. The early model was built using the same platform as the Civic. Honda began producing the CR ...

(diesel, 2015-) *

Pilot An aircraft pilot or aviator is a person who controls the flight of an aircraft by operating its directional flight controls. Some other aircrew members, such as navigators or flight engineers, are also considered aviators, because they a ...

(2016–2020 optional, 2021 standard on all trims) * Avancier/UR-V (2016- 2.0L turbo) *

Odyssey The ''Odyssey'' (; grc, Ὀδύσσεια, Odýsseia, ) is one of two major Ancient Greek literature, ancient Greek Epic poetry, epic poems attributed to Homer. It is one of the oldest extant works of literature still widely read by moder ...

(2018–19 tandard, 10-speed automatic optional *

Honda Passport The Honda Passport is a line of sport utility vehicles (SUV) from the Japanese automaker Honda. Originally, it was a badge engineered version of the Isuzu Rodeo, a mid-size SUV sold between 1993 and 2002. It was introduced in 1993 for the 1994 mo ...

(2019- ) *

Honda Ridgeline The Honda Ridgeline is a midsize pickup truck manufactured by Honda. The Ridgeline is the only pickup truck currently produced by Honda. The Ridgeline is built using a unibody frame, a transverse-mounted engine, and is only offered in a crew–cab ...

(2020- ) *

Honda Civic The is a series of automobiles manufactured by Honda since 1972. Since 2000, the Civic has been categorized as a compact car, while previously it occupied the subcompact class. , the Civic is positioned between the Honda Fit/City and Honda Acc ...

(diesel, 2018- )

Infiniti

Infiniti QX60 The Infiniti QX60, formerly called the Infiniti JX until 2013, is a mid-size luxury crossover SUV with three-row seating produced by Infiniti, the luxury vehicle division of Japanese automaker Nissan. It is underpinned by an elongated Nissan Mura ...

2022

Jeep

Jeep Cherokee (KL) The Jeep Cherokee (KL) is a compact crossover SUV manufactured and marketed by the Jeep marque of Stellantis North America. Introduced for model year 2014 at the 2013 New York International Auto Show, sales began in November 2013. It occupies ...

Jeep Renegade The Jeep Renegade is a subcompact crossover SUV produced by Stellantis under their Jeep marque. It was first shown to the public in March 2014 at the Geneva Motor Show#2014, Geneva Motor Show and production started in late August of that year. , ...

* Jeep Compass (MP) *

Jeep Grand Commander The Jeep Grand Commander (project code: ''K8'') is a mid-size crossover SUV with three-row seating manufactured by Jeep through the GAC-Stellantis, GAC Fiat Chrysler joint venture in China from 2018 to 2022. Overview Previewed by the Yuntu Co ...

Ram Trucks

Ram ProMaster City Ram, ram, or RAM may refer to: Animals * A male sheep * Ram cichlid, a freshwater tropical fish People * Ram (given name) * Ram (surname) * Ram (director) (Ramsubramaniam), an Indian Tamil film director * RAM (musician) (born 1974), Dutch * Ra ...

Ram ProMaster The Fiat Ducato is a light commercial vehicle jointly developed by FCA Italy and PSA Group (currently Stellantis), and mainly manufactured by Sevel, a joint venture between the two companies since 1981. It has also been sold as the Citroën C25 ...

2022-

Land Rover

Range Rover Evoque The Land Rover Range Rover Evoque (generally known simply as the Range Rover Evoque) is a subcompact luxury crossover SUV developed and produced by Jaguar Land Rover, a British car manufacturer, under their Land Rover marque. The original Evoqu ...

Land Rover Discovery Sport The Land Rover Discovery Sport (internal code L550) is a compact luxury crossover SUV produced by British automotive company Jaguar Land Rover since 2014, under their Land Rover marque, and since 2017 their best-selling model. Introduced in ...

Jaguar

Jaguar E-Pace The Jaguar E-Pace (X540) is a subcompact luxury crossover SUV (C-segment in Europe) produced by the British car manufacturer Jaguar Land Rover (JLR) under their Jaguar marque. It was officially revealed on 13 July 2017 and was the 2nd productio ...

Nissan

* 2022–

Nissan Pathfinder The Nissan Pathfinder is a range of sport utility vehicles manufactured by Nissan since 1985. The vehicle was originally sharing Nissan's compact pickup truck platform, and having been through four generations is now in its fifth incarnation. Si ...

Technical imperfections

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. Chrysler issued Technical Service Bulletins (TSB) for the 2014

Jeep Cherokee The Jeep Cherokee is a line of SUVs manufactured and marketed by Jeep over five generations. Originally marketed as a variant of the Jeep Wagoneer, the Cherokee has evolved from a full-size SUV to one of the first compact SUVs and into its curr ...

to "fix rough and delayed gearshifts", and Acura has issued transmission-related recalls for the 2015

Acura TLX The Acura TLX is a four-door entry-level luxury sedan sold by Acura, a luxury division of Honda, since 2014. It is the successor to both the TL and TSX models. As of 2021, the discontinuation of the RLX leaves the TLX as the flagship sedan in ...

Production

Production of the 9HP started in 2013 at ZF's Gray Court facility in

Laurens, South Carolina Laurens is a city in Laurens County, South Carolina, United States. The population was 9,139 at the 2010 census. It is the county seat of Laurens County. History Located in upstate South Carolina, the city of Laurens is named after Henry Laure ...

. 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.Chrysler Group Dedicates New Plant and Launches Nine-Speed Production in Tipton, Ind.
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