TREMEC Introduces New 7-Speed Dual Clutch Transmission February 25, 2019. Extreme performance with lightning fast shift times. Wixom, Mich, February 25, 2019 – TREMEC dual-clutch technology has transformed automated manual transmissions with the new TR-9070 DCT. The innovative transmission provides extreme performance with 900 Nm (664 lb-ft) of torque capacity and lightning fast shift times. To channel power and torque to the unique carbon fiber driveshaft, Ford Performance leveraged learnings from the tuning of its Ford GT supercar’s dual-clutch transmission and selected the TREMEC 7-speed dual-clutch transmission. This dual-clutch transmission is designed for a number of drive modes, including normal, weather, sport, drag and track, and activates features like line-lock and launch. 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. The S tronic dual-clutch transmission is a successful technology. It combines the convenience of an automatic with the efficiency of a manual transmission, while adding its own dynamic touch. Throughout much of the model line-up, the S tronic is available in four different versions, with six or seven gears. Audi A6 Avant ultra – 7-speed S tronic.
Seven Speed Dual Clutch Transmission
The S tronic dual-clutch transmission is a successful technology. It combines the convenience of an automatic with the efficiency of a manual transmission, while adding its own dynamic touch. Throughout much of the model line-up, the S tronic is available in four different versions, with six or seven gears.
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For longitudinally installed engines, Audi has developed a special version of the seven-speed S tronic in which the gear wheels for all gears are situated one behind the other on an output shaft. The three versions for transversely installed engines are configured in a single layout with two output shafts, allowing a compact design. The S tronic for transverse engines is available with six or seven gears. The seven-gear S tronic itself has two versions. Which version is used with which engine depends on the amount of torque to be transmitted.
The following is a description of the seven-speed S tronic for longitudinal engines; however, the basic principle is the same for all designs. The S tronic comprises two subunits and integrates two multi-plate clutches that control the various gears. The large K1 clutch located on the outside directs the torque via a solid shaft to the gear wheels for the odd-numbered gears 1, 3, 5 and 7. A hollow shaft rotates around the solid shaft. It is connected to the smaller K2 clutch, which is integrated into the inside of its larger sibling, and which controls the gear wheels for the even-numbered gears 2, 4 and 6, as well as the reverse gear.
Both transmission structures are continuously active, but only one is connected to the engine at any one time. For example, when the driver accelerates in third gear, the fourth gear is already engaged in the second transmission structure. The shifting process takes place as the clutch changes – K1 opens and K2 closes. Shifting gears takes only a few hundredths of a second and is completed with almost no interruption of traction. It is so smooth, dynamic and comfortable that the driver barely notices it.
The mechatronics module, a compact and robust block, comprises the electronics along with the hydraulic control elements. Its control concept allows it to vary the speed of the gear shifting process and to precisely control the necessary power. The multi-plate clutches are managed with extreme precision; the seven-speed S tronic is responsive even in stop-and-go traffic and during maneuvering.
The seven-speed S tronic can be used in a number of ways. Automatic mode has two programs: D (Drive) and S (Sport). The driver can take control of the shifting via the selector lever or with the standard paddles behind the steering wheel. Another feature of the high-performance models is the launch control system, which fully exploits the car’s acceleration potential. The sporty seven-speed S tronic for longitudinal engines can handle engine speeds of up to 9,000 rpm.
All versions of the S tronic offer a number of strengths: high efficiency, intelligent management and a large gear-ratio spread with very wide top gears. Thus the high-tech transmission delivers lower fuel consumption in many cases compared with a manual gearbox. The ultra-compact seven-speed S tronic in the A1* and A3 weighs only about 70 kilograms (154.32 lb). Their two dry clutches do not need a separate oil supply, adding further to their efficiency. All versions of the S tronic can be combined with the Audi start-stop system.
*Audi A1 Combined fuel consumption in l/100 km: 7.1 – 3.8; Combined CO₂-emissions in g/km: 162 - 99
7 Speed Dual Clutch Automatic
Status: 2011