Mercedes-Benz 7G-Tronic transmission

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7G-Tronic is Mercedes-Benz's trademark name for its 7-speed automatic transmission, starting off with the W7A 700 and W7A 400 (Wandler-7-Gang-Automatik bis 700 oder 400 Nm Eingangsdrehmoment; converter-7-gear-automatic with 516 or 295 ft·lb maximum input torque; type 722.9) as core models.

This fifth-generation transmission was the first 7-speed automatic transmission ever used on a production passenger vehicle.^[1] In all applications this transmission is identified as the New Automatic Gearbox Generation Two, or NAG2. It initially debuted in Autumn 2003 on 5 different V8-cylinder models: the E 500, S 430, S 500, CL 500, and SL 500. It became available on many 6-cylinder models too. Turbocharged V12 engines, 4-cylinder applications and commercial vehicles continued to use the older Mercedes-Benz 5G-Tronic transmission for many years.

The company claims that the 7G-Tronic is more fuel efficient and has shorter acceleration times and quicker intermediate sprints than the outgoing 5-speed automatic transmission.^[1] It has 2 reverse gears.

The transmission can skip gears when downshifting. It also has a torque converter lock-up on all 7 gears, allowing better transmission of torque for improved acceleration. The transmission's casing is made of magnesium alloy, a first for the industry, to save weight.Template:Citation needed The 7G-Tronic transmission is built at the Mercedes-Benz Stuttgart-Untertuerkheim plant in Germany, the site of Daimler-Benz's original production facility.

In July 2009, Mercedes-Benz announced they are working on a new nine-speed automatic.^[2]

Gear RatiosTemplate:Efn
Template:Diagonal split header	R 2	R 1	1	2	3	4	5	6	7	Total Span	Span Center	Avg. Step	Compo- nents

W7A All 2003	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	4 Gearsets 4 Brakes 3 Clutches

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Specifications

Operating Modes

Regular

In normal condition it sequentially shift gears, but if required it can skip some gears, that are: 7 to 5, 6 to 2, 5 to 3 and 3 to 1.^[3]

On vehicles with 6 or 8 cylinder engines with comfort mode engaged, as well as on off-road vehicles with low range selected, the transmission will always use 2nd gear as initial gear.^[4]

„Limp-Home Mode“

If the transmission control unit senses a critical fault during driving, it will activate an emergency operating mode: Upon hydraulic failures, it will stop shifting gears and permanently retain the currently selected gear; if the failure can be pinpointed to one of the internal hydraulic control valves, the transmission will continue shifting but stop using the affected gear(s). Upon electrical failure, the transmission shifts to 6th gear. If the critical fault persists after the vehicle is stopped and the engine restarted, only 2nd gear and reverse gear #2 are available.^[3]

AMG SpeedShift

AMG SpeedShift TCT

The TCT transmission is essentially the 7G-Tronic automatic transmission including "Torque Converter Technology".

Sporty, performance-oriented version with the same gear ratios. First used in 2005 Mercedes-Benz SLK 55 AMG.^[5]

In 2007, 7G-Tronic transmission with AMG SpeedShift was also called '7G-Tronic Sport'.^[6]

AMG SpeedShift MCT

Mercedes-AMG developed the 7-speed MCT "Multi Clutch Technology" planetary automatic transmission.

The MCT transmission is essentially the 7G-Tronic automatic transmission without a torque converter. Instead of a torque converter, it uses a compact wet startup clutch to launch the car from a stop and also supports computer-controlled double-clutching. The MCT (Multi-Clutch Technology) acronym refers to a planetary (automatic) transmission's multiple clutches and bands for each gear.^[7]

The MCT is fitted with 4 drive modes: "C" (Comfort), "S" (Sport), "S+" (Sport plus) and "M" (Manual) and boasts 0.1 second shifts in "M" and "S+" modes. MCT-equipped cars are also fitted with the new AMG Drive Unit with an innovative Race Start function. The AMG Drive Unit is the central control unit for the AMG SpeedShift MCT 7-speed sports transmission and all driving dynamics functions. The driver can change gears either using the selector lever or by nudging the steering-wheel shift paddles. The new Race start Function is a launch control system that enables the driver to call on maximum acceleration while ensuring optimum traction of the driven wheels.

It is available on the 2009 SL 63 AMG and E 63 AMG, and will be used for the 2011 S 63 AMG and CL 63 AMG, and the 2012 CLS 63 AMG and C 63 AMG.

Compulsory on the 2014 CLS 63 and E 63 AMG models, as well as their "S--Model" variants. Improved with the release of the 2015 model year, by decreasing the lag time between shifts.

Layout

Progress is reflected in 7 forward gearsTemplate:Efn using 11 main components,^[8]^[3]^[9] compared to 5 forward gearsTemplate:Efn with 9 main components in the previous 5G-Tronic transmission. This turns out the design as advanced compared to its predecessor but less economical compared to its competitors. It uses no bands nor sprag clutches.^[3] It is fully electronic controlled. Torque converter lock-up can operate in all 7 forward gears.^[3]

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Gear Ratios
With Assessment				Planetary Gear Set: TeethTemplate:Efn				Count	TotalTemplate:Efn CenterTemplate:Efn	Avg.Template:Efn
With Assessment				Ravigneaux		Simple		Count	TotalTemplate:Efn CenterTemplate:Efn	Avg.Template:Efn

Model Type	Version First Delivery			S₁Template:Efn R₁Template:Efn	S₂Template:Efn R₂Template:Efn	S₃Template:Efn R₃Template:Efn	S₄Template:Efn R₄Template:Efn	Brakes Clutches	Ratio Span	Gear StepTemplate:Efn
Gear Ratio	Template:Font color Template:Efn $i_{R 3}$	R 2 $i_{R 2}$	R 1 $i_{R 1}$	1 $i_{1}$	2 $i_{2}$	3 $i_{3}$	4 $i_{4}$	5 $i_{5}$	6 $i_{6}$	7 $i_{7}$
StepTemplate:Efn	Template:Font color	$\frac{i_{R 1}}{i_{R 2}}$	$- \frac{i_{R}}{i_{1}}$ Template:Efn	$\frac{i_{1}}{i_{1}}$	$\frac{i_{1}}{i_{2}}$ Template:Efn	$\frac{i_{2}}{i_{3}}$	$\frac{i_{3}}{i_{4}}$	$\frac{i_{4}}{i_{5}}$	$\frac{i_{5}}{i_{6}}$	$\frac{i_{6}}{i_{7}}$
Δ StepTemplate:Efn Template:Efn		Template:Font color			$\frac{i_{1}}{i_{2}} : \frac{i_{2}}{i_{3}}$	$\frac{i_{2}}{i_{3}} : \frac{i_{3}}{i_{4}}$	$\frac{i_{3}}{i_{4}} : \frac{i_{4}}{i_{5}}$	$\frac{i_{4}}{i_{5}} : \frac{i_{5}}{i_{6}}$	$\frac{i_{5}}{i_{6}} : \frac{i_{6}}{i_{7}}$
Shaft Speed	Template:Font color	$\frac{i_{1}}{i_{R 2}}$	$\frac{i_{1}}{i_{R 1}}$	$\frac{i_{1}}{i_{1}}$	$\frac{i_{1}}{i_{2}}$	$\frac{i_{1}}{i_{3}}$	$\frac{i_{1}}{i_{4}}$	$\frac{i_{1}}{i_{5}}$	$\frac{i_{1}}{i_{6}}$	$\frac{i_{1}}{i_{7}}$
Δ Shaft SpeedTemplate:Efn	Template:Font color	$\frac{i_{1}}{i_{R 1}} - \frac{i_{1}}{i_{R 2}}$	$0 - \frac{i_{1}}{i_{R 1}}$	$\frac{i_{1}}{i_{1}} - 0$	$\frac{i_{1}}{i_{2}} - \frac{i_{1}}{i_{1}}$	$\frac{i_{1}}{i_{3}} - \frac{i_{1}}{i_{2}}$	$\frac{i_{1}}{i_{4}} - \frac{i_{1}}{i_{3}}$	$\frac{i_{1}}{i_{5}} - \frac{i_{1}}{i_{4}}$	$\frac{i_{1}}{i_{6}} - \frac{i_{1}}{i_{5}}$	$\frac{i_{1}}{i_{7}} - \frac{i_{1}}{i_{6}}$

W7A ALL 722.9	Template:Convert 2003^[8]^[9]			42 86	86 110	28 76	46 114	4 3	Template:Round Template:Round	Template:Font color
Gear Ratio	Template:Font color Template:Efn $\frac{598}{399}$	Template:Round $\frac{38, 272}{17, 157}$	Template:Font color	Template:Round $\frac{203, 840}{46, 569}$	Template:Font color Template:Efn $\frac{133, 120}{46, 569}$	Template:Round $\frac{2, 080}{1, 083}$	Template:Font color	Template:Font color	Template:Font color	Template:Font color
Step	Template:Font color	1.5313	Template:Font color Template:Efn	1.0000	Template:Font color	1.4884	Template:Font color	Template:Font color Template:Efn	1.2189	1.1276
Δ StepTemplate:Efn		1.0288			Template:Font color Template:Efn	1.0605	Template:Font color Template:Efn	1.1226	1.0810
Speed	Template:Font color	–1.9622	Template:Font color	1.0000	1.5313	2.2791	3.1987	4.3772	Template:Font color	Template:Font color
Δ Speed	Template:Font color	0.6808	Template:Font color	1.0000	0.5313	0.7478	0.9196	1.1785	Template:Font color Template:Efn	Template:Font color Template:Efn

Ratio R & Even	$i_{R 3} = - \frac{S_{4} (S_{3} + R_{3})}{S_{3} R_{4}}$		$- \frac{S_{4} (S_{1} + R_{1}) (S_{3} + R_{3})}{R_{1} S_{3} R_{4}}$		$\frac{(S_{1} + R_{1}) (S_{3} + R_{3}) (S_{4} + R_{4})}{R_{1} R_{3} R_{4}}$		$i_{4} = \frac{S_{3} + R_{3}}{R_{3}}$		$\frac{S_{4} (S_{1} + R_{1}) (S_{3} + R_{3})}{S_{4} (S_{1} + R_{1}) (S_{3} + R_{3}) + S_{1} S_{3} R_{4}}$
Ratio R1 & Odd	$i_{R 1} = - \frac{S_{4} (S_{2} + R_{2}) (S_{3} + R_{3})}{S_{2} S_{3} R_{4}}$			$\frac{(S_{2} + R_{2}) (S_{3} + R_{3}) (S_{4} + R_{4})}{S_{2} R_{3} R_{4}}$		$\frac{(S_{3} + R_{3}) (S_{4} + R_{4})}{R_{3} R_{4}}$		$i_{5} = \frac{1}{1}$	$\frac{S_{4} (S_{2} + R_{2}) (S_{3} + R_{3})}{S_{4} (S_{2} + R_{2}) (S_{3} + R_{3}) + R_{2} S_{3} R_{4}}$
Algebra And Actuated Shift ElementsTemplate:Efn
Brake 1Template:Efn		❶			❶				❶
Brake 2Template:Efn				❶	❶	❶	❶
Brake 3Template:Efn			❶	❶						❶
Brake BRTemplate:Efn	Template:Font color Template:Efn	❶	❶
Clutch 1Template:Efn	Template:Font color Template:Efn					❶	❶	❶
Clutch 2Template:Efn							❶	❶	❶	❶
Clutch 3Template:Efn	Template:Font color Template:Efn	❶	❶	❶	❶	❶		❶	❶	❶

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Applications

Mercedes models

Mercedes C-Class

2005–2007 Mercedes-Benz W203 (C 320 CDI, C 230, C 280, C 350; post-facelift)
2005–2007 Mercedes-Benz CL203 (C 230 Sport Coupé, C 350 Sport Coupé; post-facelift), (CLC 250, CLC 350)
2011–2018 Mercedes-Benz W204 (C 63 AMG, C 63 AMG Black Series)
2014 Mercedes-Benz W205 (C 180)

Mercedes E-Class

2009–2016 Mercedes-Benz W212 (E 200 AMG 7G-Tronic, E 63 AMG)
2009–2013 Mercedes-Benz W212 (E 200 AMG 7G-Tronic)
2007–2009 Mercedes-Benz W211 (E 230 V6 7G-Tronic)

Mercedes S-Class

2013–2017 Mercedes-Benz W222 (all models except Maybach S 500 and Maybach S 500 4Matic)
2017–2020 Mercedes-Benz W222 (V12 models only)

Non Mercedes-Benz models

Infiniti

2014–2019 Infiniti Q50 (2.0t (M274 DE20 LA)^[10]).
2015–2016 Infiniti Q50 (2.2d (OM651 22 LA)^[11]).
2017–2018 Infiniti Q60 (2.0t (M274 DE20 LA)).

SsangYong Motor

2017–2020 SsangYong Rexton G4 (2.2 e-XDi Euro 6 Turbo-Diesel)
SsangYong Rodius Korando Turismo (in South Korea)
SsangYong Rodius Turismo (in UK)

References

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External links

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Mercedes-Benz 7G-Tronic transmission

Contents

Specifications

Operating Modes

Regular

„Limp-Home Mode“

AMG SpeedShift

AMG SpeedShift TCT

AMG SpeedShift MCT

Layout

Applications

Mercedes models

Mercedes C-Class

Mercedes E-Class

Mercedes S-Class

Mercedes SLK-Class

Mercedes CLS-Class

Mercedes CLK-Class

Non Mercedes-Benz models

Infiniti

SsangYong Motor

See also

References

External links

Navigation menu

Mercedes-Benz 7G-Tronic transmission

Specifications

Operating Modes

Regular

„Limp-Home Mode“

AMG SpeedShift

AMG SpeedShift TCT

AMG SpeedShift MCT

Layout

Applications

Mercedes models

Mercedes C-Class

Mercedes E-Class

Mercedes S-Class

Mercedes SLK-Class

Mercedes CLS-Class

Mercedes CLK-Class

Non Mercedes-Benz models

Infiniti

SsangYong Motor

See also

References

External links

Navigation menu

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