One such six-speed automatic unit, made by ZF, is found in the 2011 Hyundai Genesis Coupe. Traditional automatic transmissions differ from manual units in that they use a torque converter rather than a clutch in switching between gears. Several years ago, automakers began adding extra gears to their automatic transmissions to maintain power and fuel economy throughout the rpm range. In more recent times, even some mainstream cars such as the 2011 Ford Fusion have offered six-speed manual units. The Mazda RX-8 is one of many such cars that use a six-speed manual. These transmissions feature closer gear ratios than a five-speed manual unit, allowing the driver to stay within the engine’s ideal rpm range.Īlso, the sixth forward gear allows highway cruising without making the engine work so hard. Traditionally, six-speed manual units have been reserved for high-performance cars. All the gears on the main shaft, except the reverse, have synchromesh engagement. The transmission has six forward gears and one reverse gear. The weight-optimized cast aluminum shift forks are installed on anti-friction bearings on the shift rods, to reduce the shift forces. The three-cone synchronization of the first two gears serves the same purpose, while the following gears are provided with two-cone synchronization. This reduces drag torque, thus facilitating gear shifting at low temperatures in particular. The overhead camshaft with third and fourth gears and the reverse gear do not run in the oil bath. The clutch is operated hydraulically and the gears are actuated via cables. The large spread of 6.7 allows a reduction in engine speed while at the same time ensuring that sufficient tractive power is available when moving off with a fully laden A-Class and trailer up to a gross weight of 3.4 tons. The signal for the reverse gear activates the reversing lights. The idle position is identified in this way, making the start/stop function possible. An integrated magnet on the gearshift shaft is detected by a Hall sensor. The three-shaft transmission is also very compact (length 345 mm) and light (dry weight 46 kg) and incorporates several special features for particularly pleasant gear shifting. The first 6-speed manual transmission was introduced in the 1967 Alfa Romeo 33 Straddle. Six-speed manual transmissions started to emerge in high-performance vehicles in the early 1990s, such as the 1990 BMW 850i and the 1992 Ferrari 456. In more recent times, 6-speed automatic and sequential-manual transmissions have worked themselves onto passenger cars as well. The most common 6-speed transmissions are traditional manual units where the driver actuates a clutch with her foot while shifting through the gears. In the automotive world, 6-speed refers to a transmission with 6 forward gears.
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