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The dual-clutch transmission DQ200 of the Volkswagen Group was the subject of recall actions in several countries due to technical problems. [55] In 2009, 13,500 vehicles with DQ200 were recalled in the USA due to issues and sent to workshops.
A direct-shift gearbox (DSG, German: Direktschaltgetriebe [1]) [2] [3] is an electronically controlled, dual-clutch, [2] multiple-shaft, automatic gearbox, in either a transaxle or traditional transmission layout (depending on engine/drive configuration), with automated clutch operation, and with fully-automatic [2] or semi-manual gear selection.
Subaru owners have complained about problems with the Lineartronic CVT transmissions [3] and Subaru extended the warranty for cars from model years 2010 to 2018. [4] [5] [6] Gear Ratios: 6.32:1; Usage: 2010–current Subaru Legacy / Outback / Exiga / Impreza / Levorg / Forester / XV and 2015 Subaru WRX Premium and Limited Editions. TR580. 2012 ...
Schematic of a DCT. A dual-clutch transmission (DCT, sometimes referred to as a twin-clutch transmission, or double-clutch transmission) uses two separate clutches for odd and even gear sets. [36] The design is often similar to two separate manual transmissions with their respective clutches contained within one housing, and working as one unit.
A cone CVT varies the drive ratio by moving a wheel or belt along the axis of one or more conical rollers. The simplest type of cone CVT, the single-cone version, uses a wheel that moves along the slope of the cone, creating variation between the narrow and wide diameters of the cone. Some cone CVT designs use two rollers.
The operation of a dual-clutch transmission is analogous to two traditional manual transmissions, each with its own clutch, operating in parallel and alternating shifts. The Ford unit is a six-speed with one clutch acting on reverse, first, third, and fifth gears, and the other used for second, fourth, sixth gears.
A continuously variable transmission (CVT) can change seamlessly through a continuous range of gear ratios. This contrasts with other transmissions that provide a limited number of gear ratios in fixed steps. The flexibility of a CVT with suitable control may allow the engine to operate at a constant RPM while the vehicle moves at varying speeds.
Automated manual transmissions can be semi-automatic or fully-automatic in operation. Several different systems to automate the clutch and/or shifting have been used over the years, but they will generally use one of the following methods of actuation for the clutch and/or shifting: hydraulic or electro-hydraulic actuation, [12] electro-mechanical, [13] pneumatic, [6] [14] [15] electromagnetic ...