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Direct-shift gearbox

This article is about the Volkswagen Group dual-clutch transmissions. For dual-clutch transmissions in general, see Dual-clutch transmission.
Automotive transmissions
Manual
Automatic / Semi-automatic
DSG DL 501 Mechatronics
DSG DL 501

Part-cutaway view of the Volkswagen Group 6-speed direct-shift gearbox. The concentric multi-plate clutches have been sectioned, along with the mechatronics module. This also shows the additional power take-off for distributing torque to the rear axle for four-wheel drive applications. (View this image with annotations)
Schematic diagram of a dual-clutch gearbox:
  • 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

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.

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]

  1. ^ Volkswagen Service Training Manual 308 - 02E 6-speed DSG
  2. ^ a b c d e f g "Volkswagen DSG - World's first dual-clutch gearbox in a production car". Volkswagen-Media-Services.com (Press release). Volkswagen Group / Volkswagen AG. 22 November 2002. Archived from the original on 24 May 2006. Retrieved 30 October 2009.
  3. ^ a b "Twin Clutch / Direct Shift Gearbox (DSG) - What it is, how it works". Cars.About.com. Archived from the original on 7 July 2011. Retrieved 27 October 2009.
  4. ^ a b c "How the Dual Clutch Transmission Works". DCTfacts.com. The Lubrizol Corporation. 2009. Archived from the original on 17 September 2009. Retrieved 27 October 2009.
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