| 7G-Tronic | |
|---|---|
 | |
| Overview | |
| Manufacturer | Daimler AG |
| Production | 2003–2020 |
| Body and chassis | |
| Class | 7-speed longitudinal automatic transmission |
| Related | ZF 6HP · ZF 8HP |
| Chronology | |
| Predecessor | 5G-Tronic |
| Successor | 9G-Tronic |
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 E500, S 430, S 500, CL 500, and SL 500. It also soon became available on many 6-cylinder models. 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.[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 Model
|
R 2 | R 1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | Total Span |
Span Center |
Avg. Step |
Compo- nents |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| W7A All 2003 |
−2.231 | −3.416 | 4.377 | 2.859 | 1.921 | 1.368 | 1.000 | 0.820 | 0.728 | 6.016 | 1.785 | 1.349 | 4 Gearsets 4 Brakes 3 Clutches |
- ^ Differences in gear ratios have a measurable, direct impact on vehicle dynamics, performance, waste emissions as well as fuel mileage
- ^ a b "7G-Tronic: Mercedes-Benz presents the world's first seven-speed automatic transmission for passenger cars" (PDF). DaimlerChrysler press release. Archived from the original (PDF) on 2011-07-06. Retrieved 2011-02-22.
- ^ 19 July 2010. "Merc plans nine-speed auto'". Autocar.co.uk. Retrieved 2010-07-20.
{{cite web}}: CS1 maint: numeric names: authors list (link)