Recently, seems like the automobile manufacturers compete each other, who will develop more sophisticated gearbox. Back in 1980’s, the cars with 5-speed manual gearboxes were very rare and the automatic transmission were with only 3 or 4 speeds. In the 1990’s, the premium brands – Audi, BMW, Mercedes, VW started to install 6-speed manual gearboxes and 5-speed automatics.
During the last 10 years, VW released DSG – 7-speed double clutch transmission, Mercedes came up with 7G-Tronic and nowadays BMW and Lexus put in their vehicles 8-speed automatic transmissions. The „pioneer” in creating transmissions with many speeds is Mercedes, they were the first to install 7G-Tronic in 2003 in their models.
Of course, it is turn to Mercedes to show their excellence and create a nine-speed automatic gearbox – 9G-Tronic. It will improve the fuel efficiency and reduce the CO2 emissions. The new automatic will probably debut on the 2012 Mercedes-Benz S-Class.
International debut for the first automatic transmission with torque converter nine reports 9G-TRONIC. Thanks to this innovative transmission system, the engine of the Mercedes-Benz E 350 BlueTEC will be one of six diesel most frugal in its class. The consumption of the E-Class BlueTEC with 9G-TRONIC, in fact, amounts to just 5.3 liters of diesel per 100 km. Outstanding traction and comfort for ultra-smooth gear engagement showing real quality typical of the Star. E 350 BlueTEC with 9G-TRONIC series can already be ordered, despite the widening of the price of equipment Sedan and Station-Wagon remain unchanged.
The E 350 BlueTEC V6 diesel engine with 185 kW (252 hp) and the new 9G-TRONIC as standard, available in both sedan that Station-Wagon boasts an average fuel consumption in the combined cycle of 5.3 l/100 km ( Station-Wagon 5.5 l/100 km), compared to CO 2 of 138 g / km (Station-Wagon 144 g / km). This means that the new models with 9G-TRONIC beat their predecessors both in terms of reduced consumption and emissions of CO 2 . The largest number and spacing of relationships are then all to the advantage of the traction and comfort of the exploitation of engine power during its progress.
Perfect interaction: the E 350 BlueTEC diesel V6 and 9G-TRONIC
The overall reduction in the level of the system provides a two-fold contribution: on the one hand improves NVH values, thus increasing the comfort on board of the E-Class, on the other hand also reduces external noise by 4 dB (A), then the noise environmental.
In terms of fuel economy, the E 350 BlueTEC with 9G-TRONIC benefits mainly to the high effectiveness of the change. The wide spacing of 9.15 from the first to ninth, in fact, in addition to allowing a noticeable reduction in the level of the number of revolutions is decisive for the high energy efficiency and driving comfort. Shift times and response times ensure maximum spontaneity in the face of a very comfortable plug. The 9G-TRONIC reacts with extreme quickness, increasing driving pleasure, especially in manual mode and and S.
Mercedes-Benz 9-Gang Automatik 9G-TRONICA comprehensive package of measures ensures the particular comfort of grafting the new 9G-TRONIC automatic transmission characteristic of the Mercedes-Benz which has been given the greatest attention in the development phase. These measures include the innovative direct command, which allows shorter shift times and barely perceptible. The combination of double torsional damper and centrifugal pendulum in the drive technology ensures exceptional comfort and traction. Due to the increased spacing of the reports, you can also reach higher speeds at lower engine speeds, with even more comfort. To give a concrete example, in 9th gear at 120 km / h, the engine speed is only 1,350 rev / min about.
High-tech for a transmission unprecedented
The development engineers of the new 9-speed automatic transmission have paid particular attention to the question of "lightweight compact". Despite two more reports and a maximum torque transferable which can reach 1,000 Nm, the exchange rate has a smaller footprint than the previous as well as being lighter. The bipartition of the gearbox has been maintained: the converter box is lightweight aluminum, while that of the exchange with the oil sump in synthetic material weight is optimized in a magnesium alloy even lighter.
Another objective was the creation of nine positions shift with a minimum number of planetary trains and controls. Thanks to intensive breeding and computer analyzes this goal has been achieved, with just four simple planetary trains and six controls. Three sensors RPM monitor the operation and provide the management of the exchange the necessary data for the maximum effectiveness of graft. In this way, if the situation so requires, during acceleration or deceleration, you can skip more than one gear to engage the desired one.
The new automatic transmission is equipped with two pumps, so that the contribution of light oil Synthetic Fuel Economy 2nd generation, cut-resistant and long-lasting, is reliable and at the same time very efficient from an energy point of view. The main pump mechanical structure with offset and scaled via chain drive is located next to the primary shaft and is supported by a separate electric pump extra. This structure, on the one hand allows you to actively adjust the volumetric flow rate of lubricating oil and cooling according to needs and on the other, makes the 9G-TRONIC compatible for the start / stop function. For the first time in the world then a nine planetary gearbox ratios have a direct command, which allows you to greatly increase the hydraulic efficiency inside the gearbox.
About 22 million automatic transmissions for Mercedes-Benz since 1961
For over 50 years Mercedes-Benz develops and produces excellent automatic transmissions are characterized by exceptional comfort graft, exceptional energy efficiency and superior durability. Overall far from the factory in Stuttgart-Hedelfingen, not far from the Group's headquarters in Stuttgart-Untertürkheim, came out about 22 million automatic transmissions for passenger cars.
The 9G-TRONIC, compatible with rear wheel drive, drive, hybrid and plug-in hybrid also in the coming years will be used in almost all series and for almost all engines
The E 350 BlueTEC with 9G-TRONIC series can already be ordered in both sedan that ito Station-Wagon. Customers will benefit also the advantages of the new automatic transmission at no extra cost. The launch is scheduled for September 2013.
9G TRONIC Ratio :
Gear
1
5.50
2 3.33
3 2.31
4 1.66
5 1.21
6 1.00
7 0.87
8 0.72
9 0.60
R 4.93
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