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Direct-shift gearbox
Type of dual-clutch transmission / From Wikipedia, the free encyclopedia
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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. The first dual-clutch transmissions were derived from Porsche in-house development for the Porsche 962 in the 1980s.
![DSG DL 501 Mechatronics](http://upload.wikimedia.org/wikipedia/commons/thumb/4/46/Mechatronics_DSG_DL_501.jpg/640px-Mechatronics_DSG_DL_501.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/VW_DSG_transmission_DTMB.jpg/640px-VW_DSG_transmission_DTMB.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/4e/Cambio_a_doppia_frizione.svg/640px-Cambio_a_doppia_frizione.svg.png)
- M: Motor
- A: Primary drive and driving shaft
- B: Dual clutch
- C: Driven shaft
- D: Layshaft, hollow, even gears
- E: Layshaft, odd gears
- F: Output
In simple terms, a DSG automates two separate "manual" gearboxes (and clutches) contained within one housing and working as one unit.[2][3][4] It was designed by BorgWarner and is licensed to the Volkswagen Group, with support by IAV GmbH.[citation needed] By using two independent clutches,[2][4] a DSG can achieve faster shift times[2][4] and eliminates the torque converter of a conventional epicyclic automatic transmission.[2]