Mercedes-Benz announces launch of new 9G TRONIC - torque converter with 92% efficiency
by Mark Jordan | March 7, 2014
Mercedes-Benz has these days the "start for the new 9G-TRONIC" reported that as a nine-speed automatic transmission only at the Mercedes-Benz E 350 BlueTEC premiered. We therefore expected soon with the "rollout" of the new transmission, "in the following years in almost all models and engines" - the manufacturers themselves
First use so far only in the E 350 BlueTEC
So far, the gear 350 BlueTEC was in E rather an exotic car, if the vehicle has already been partially delivered as E 350 BlueTEC. With the new, innovative power transmission, the E-class here means 9G one of the most fuel-efficient six-cylinder diesel models in its class with high Wirkungstgrad - the NEDC fuel consumption is to be reduced to 5.3 liters of diesel per 100 kilometers in here - the Model T to 5.5 liters / 100km (CO2 emissions of 138 g / km and 144g/km), the gear changes are barely perceptible. At 120 km / h in 9 Transition is due to a rotation of only 1.350 U / min
Power transmission
Transmission 9G-TRONIC automatic transmission
Translations Final drive
1 Gear
2 Gear
3 Gear
4 Gear
5 Gear
6 Gear
7 Gear
8 Gear
9 Gear
REVERSE
2.24
5.50
3.33
2.32
1.66
1.21
1.00
0.87
0.72
0.60
-4.93
9G TRONIC automatic transmission - in-house development of Mercedes-Benz
The spread of the gear is at 9.15 which is the maximum possible torque of the transmission at 1000 Newton meters, the transmission has become even easier for the 7G-TRONIC PLUS. The transducer housing is made of lightweight aluminum, the gearbox with optimized weight plastic oil pan from an even lighter magnesium alloy.
The control box is 2 pumps equipped. The significantly reduced, major mechanical pump in "Off Axis" construction is adjacent to the main shaft is driven via a chain and supplemented by a separate electric auxiliary pump. This design allows one hand the demand, active control of the lubricating and cooling oil flow rate and makes the 9G-TRONIC other hand Start-/Stopp-fähig. Through the world's first direct control in a planetary automatic transmission with nine speeds also the hydraulic efficiency could be increased significantly within the transmission.
The 9G-TRONIC is suitable for the rear, four-wheel drive, hybrid and plug-in hybrid drive and will come in the following years in almost all models and engines used. A first test of the transmission in the E 350 BlueTEC we have already completed - far ahead of other newspapers - the test of us is also a corresponding video to find.
Pictures: Daimler AG
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