Mercedes-Benz 9G-TRONIC

9G-Tronic is the sales description Neunstufen- converter automatic transmission for various Mercedes-Benz car , starting with the W9A 700 ( W andler- 9 -Gang- A utomatik to 700  Nm input torque; Series  725.0 ) of Daimler as a core model.

demolition

Cutaway model of the transmission with components for hybrid drive

After the 5G and 7G Tronic, this is the third generation of modern transmissions, in which the previously common restriction to the design as a pure series coupling transmission is overcome and combined with that of the parallel coupling transmission in order to increase the range of ratios What was only possible with the help of high-performance computers and which has led to a wheel set concept that is patented worldwide. Therefore, the internal name is NAG3 ( N ew A utomatik G etriebe 3 . Generation). The transmission was introduced in the Mercedes-Benz E 350 BlueTEC in September 2013 and is gradually replacing the 7G-Tronic (Plus) seven-speed transmission. Initially, the transmission was only produced at the Daimler plant in Stuttgart-Hedelfingen , where over 22 million car automatic transmissions have been manufactured over the past 50 years. The development takes place not far from here at the corporate headquarters in Stuttgart-Untertürkheim . Since April 2016, the transmission has also been produced by the Daimler subsidiary Star Assembly in Sebeş , Romania .

technology

Development priorities

The main focus was on high shift comfort, which is achieved through several measures: on the one hand through the new direct control, which enables quick, smooth gear changes, and on the other hand through a combination of twin turbine torsion damper and centrifugal pendulum technology in the converter. The gearbox is designed for a maximum torque of 1,000 Nm.

Another goal was to achieve at least one more forward gear without exceeding the construction costs of the previous model. The wide gear spread (first version with a total spread of more than 9: 1) allows the speed level of the combustion engine to be reduced (downspeeding), which is a decisive factor in improving energy efficiency and thus reducing fuel consumption. In addition, the reduced engine speed level improves the noise vibration harshness comfort and external noise is reduced by up to 4 dB (A). The Mercedes-Benz E 350 BlueTEC achieves a speed of 120 km / h in 9th gear at an engine speed of approx. 1,350 / min.

Despite two additional gears, the transmission has the same installation space as the previous model and is 1 kg lighter at 95 kg including oil and converter.

Technical specifications

With 9 forward gears, the transmission meets all requirements. Achieving this goal with only 10 main components (planetary gear sets, brakes, clutches) shows how advanced the concept is.

Gears and translations				Planetary gear set: teeth				number	total	Average
model model series	First- delivery			Sun 1 Hollow 1	Sun 2 Hollow 2	Sun 3 Hollow 3	Sun 4 Hollow 4	Brakes Clutch	Spreading tongue	Gear- step
gear	1	2	3	4th	5	6th	7th	8th	9	R.
W9A ALL 725.0	2013			46 98	44 100	36 84	34 86	3 3	9.1495	1.3188
Transl.	5.5032	3.3333	2.3148	1.6611	1.2106	1.0000	0.8651	0.7167	0.60148	- 4.9316
W9A ALL 725.0	2016			46 98	44 100	37 83	34 86	3 3	8.9022	1.3143
Transl.	5,35448	3.2432	2.2523	1.6356	1.2106	1.0000	0.8651	0.7167	0.60148	- 4.7983

1. ↑ First version with a total spread of more than 9: 1.
2. ↑ Automatic Transmission 9G-Tronic 725.0 System Description . September 2013. (PDF)
3. ↑ Second version introduced without notice with the Mercedes-Benz E-Class (W213) to reduce the level between gear 4 and 5 below that of the 7G-Tronic (1.3684: 1).
4. ↑ The new Mercedes-Benz SL: The legend - now even more dynamic . February 2016.

Torque converter

The hydrodynamic torque converter was largely taken over from the previous 7G-Tronic transmission . It has a torque converter lock-up clutch and a twin turbine torsion damper with a centrifugal pendulum.

Oil supply

For an energy efficient supply of the durable synthetic Fuel Economy low-viscosity oil , the transmission is equipped with two oil pumps: a significantly reduced compared to its predecessor, arranged next to the main shaft, mechanical vane pump with a chain drive, and an additional electrical G-rotor pump , by a brushless DC motor is driven. The mechanically driven pump is responsible for the basic supply of the transmission, whereby the delivery volume flow depends on the speed of the combustion engine. The additional pump is activated as required by the electronic transmission control. This design enables needs-based, active control of the lubricating and cooling oil volume flow and makes the 9G-Tronic start / stop capable. When the internal combustion engine is not running, the transmission remains ready to start simply by supplying the electrical auxiliary pump.

Filter elements for the two pumps are integrated in the plastic oil pan.

control

The switching elements are controlled via a hydraulic direct control with electromagnetically actuated valves. Compared to the previous transmission, which had a hydraulic pilot control, the leakage losses could be reduced by 80%.

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maintenance

Compared to the previous gearboxes NAG1 (5G-Tronic) and NAG2 (7G-Tronic) , the NAG3 gearbox is much more highly integrated, so that in the event of service repairs are only possible by replacing entire assemblies. This applies, for example, to the oil filters permanently integrated in the plastic oil pan. Another example is the fully integrated mechatronic module with sensors, control unit and electro-hydraulic circuit board. This module must be replaced as a unit, even if, for example, only one sensor is defective.

use

When the 9G-Tronic was launched, it was initially only available in the Mercedes-Benz E 350 BlueTEC . The GLE Coupé (C 292) was the first series that came onto the market with the 9G-Tronic right from the start. The 9G-Tronic was already available as standard in all models (except AMG) when it was launched.

The 9G-Tronic is suitable for rear-wheel , all-wheel , hybrid and plug-in hybrid drives and will be used in most series with a longitudinally installed engine in the years to come.

The following table shows the availability of the 9G-Tronic in the individual series.

Sales description	model series	Construction period	Gasoline engine	diesel	Hybrid
C class	W / S 205	from 04/2016	All models, 160 and 180 subject to a surcharge	All models, 180 d and 200 d, subject to a surcharge	300 e, 300 de
C-Class Coupé	C 205	from 04/2016	200 4MATIC, 400 4MATIC, AMG 43 4MATIC	220 d , 220 d 4MATIC, 250 d (4MATIC)	-
CLS	C / X 218	from 09/2014	500	350 BlueTEC	-
		from 04/2015	500 4MATIC	220 d, 250 d, 350 d (4MATIC)	-
		from 04/2016	400	-	-
GLC	X 253	from 06/2015	250 4MATIC	220 d 4MATIC, 250 d 4MATIC	-
		from 04/2016	AMG 43 4MATIC	-	-
		from 10/2016	300 4MATIC	350 d 4MATIC	-
GLC Coupé	C 253	from 09/2016	250 4MATIC	220 d 4MATIC, 250 d 4MATIC	-
		from 10/2016	300 4MATIC, AMG 43 4MATIC	350 d 4MATIC	-
GLE	W 166	from 08/2015	450 AMG 4MATIC, 500 4MATIC	250 d (4MATIC), 350 d 4MATIC	-
GLE Coupé	C 292	from 07/2015	400 4MATIC, 450 AMG 4MATIC, 500 4MATIC	350 d 4MATIC	-
GLS	X 166	from 11/2015	400 4MATIC, 500 4MATIC	350 d 4MATIC	-
E class	W / S 212	03/2014 - 06/2016	-	350 BlueTEC	-
		09/2014 - 06/2016	-	220 BlueTEC , 250 BlueTEC , 300 BlueTEC	-
	W / S 213	from 02/2016	200	220 d	-
		from 07/2016	200 , 200 4MATIC, 250, 300, 400 4MATIC, AMG 43 4MATIC	200 d, 350 d	350 e, 300 de
E-Class Coupé / Cabriolet	A / C 207	from 09/2014	-	220 d , 250 d , 350 d	-
S-Class / Mercedes-Maybach	W / X 222	from 10/2015	500 (4MATIC)	350 d (4MATIC)	-
SL	R 231	from 03/2016	400, 500	-	-
SLK	R 172	05/2015 - 03/2016	200 , 300	250 d	-
SLC		from 03/2016	180 , 200 , 300, AMG 43	250 d	-

1. ↑ ^{a b c d e f g h i} As an optional extra.

literature

• Christoph Dörr, Henrik Kalczynski, Anton Rink, Marcus Sommer: The 9G-Tronic nine-speed automatic transmission from Mercedes-Benz , in: ATZ 116 (2014), No. 1, pp. 40–45, Springer Vieweg, Wiesbaden

Individual evidence

1. ↑ ^{a b c d e f} New nine-speed automatic in the Mercedes-Benz E 350 BlueTEC: Start of the new 9G-Tronic . March 6, 2014. Archived from the original on November 6, 2014. Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved November 6, 2014. 
2. ↑ Developed on our own initiative: The best of 85 billion possibilities .
3. ↑ ^{a b} 50 years of Mercedes-Benz automatic transmissions . April 12, 2011. Archived from the original on February 9, 2015. Info: The archive link was automatically inserted and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved February 9, 2015. 
4. ↑ Daimler starts production of nine-speed automatic transmissions in Romania . April 4, 2016. Retrieved April 4, 2016.
5. ↑ ^{a b} 9G-Tronic · In-depth information . Archived from the original on November 20, 2015. Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved November 20, 2015. 
6. ↑ Thomas Harloff: Nine-course menu . In: Süddeutsche Zeitung . May 27, 2014 ( sueddeutsche.de ).
7. ↑ ^{a b c} Christoph Dörr, Henrik Kalcynksi, Anton Rink, Marcus Sommer: The 9G-Tronic nine-speed automatic transmission from Mercedes-Benz , in: ATZ 116 (2014), No. 1, pp. 40–45, Springer Vieweg, Wiesbaden