DSG

The abbreviation of the English founded DSG Direct Shift Gear connection, the German equivalent Direktschaltgetriebe sounds. DSG gearbox is combining the advantages of mechanical and automatic transmissions. DSG gearbox is a joint effort of designers and companies Volkswagen BorgWarner. The development of this new DSG gearbox lasted from pure paper to the introduction of mass production as much as 5 years.

cut DSG

History

For the inventor of the dual clutch technology is considered the Frenchman Adolphe Kegresse, who gave his idea patented in 1939. The production has already taken place, it prevented the Second World War. The car came up again in the 80th years, in prototype sports car manufacturer Porsche 956 and 962, marking carried gearbox PDK (Porsche Doppelkupplungs) . Later, Audi used this type of gear at special contest the Audi Sport Quattro S1. To gain a valuable competitive advantage seconds was the largest of their rapid shifting gears. Sufficiently fast and reliable control of mainly two clutches but only help solve today's modern electronics and hydraulics. The principle of using two related transmission was therefore introduced into production much later. At present, dual-clutch gearbox produces several companies - Getrag, Ricardo and Borg-Warner.

Construction

In the following, we describe the first generation of the 6-stage DSG gearbox, which is designed for transverse installation in the car is able to transmit torque to 350 Nm and her weight was 90 kg (with oil filling). The DSG is a pair of parallel arranged dvouhřídelových transmissions. In order to minimize transmission, the input shaft inserted into each other, see section transmission.

kinematic scheme DSG

Inside the DSG gearbox is 6.5 liters of oil to a temperature of 140 ° C. Gear pump delivers 15 to 90 liters of oil per minute. Oil circulation for proper cooling and lubrication of gears, shafts and other mechanisms. At the other end of transmission (away from the engine) is a heat exchanger and filter.

Another important part is the multi-plate clutch, which was in charge of the development company BorgWarner. Clutch discs are working in an oil bath which lubricates the clutch system while cooling. Select oil bath clutch ensures longer life and a wider range of possible operating conditions. The disadvantage of this solution is the need to continuously power the oil pump, which increases the losses. Each of the two clutches wet multiple-disc clutch transmits power to a shaft. First clutch controls 1, 3 and 5 gear and reverse gear. The second clutch shaft spins with 2, 4 and 6 gear.

multi-plate clutch

A new seven-speed DSG gearbox is a dry clutch, which is designed for smaller engines. By limiting the maximum transmission is transferable torque of 250 Nm 350 Nm compared to the older six-tract. The advantage of the higher efficiency and therefore a little less fuel consumption.

seven-speed DSG

How does the DSG?

DSG has a near-normal efficiency of manual transmissions. It is thanks to the intelligent management mode, and clutches a pair of shift mechanisms. Electro-hydraulic control module prepares a more forward transmission gear. For example, when starting is also ranked first and 2 gear. After the foot of gas is activated clutch for first gear. the car starts and when the engine reaches optimum speed for sorting will only gradually off No. 1 clutch while switching clutch No. 2 There is no way to interrupt the flow of power to the wheels. The moment the clutch is energized and the No. 2 power is transferred by this part, the second branch transmission prepare the inclusion of the third degree. The whole sort takes only 0.3 to 0.4 s.

When the electronics detects that the car begins to slow down without the burden of preparing a lower transmission speeds. In a situation where it should be subsumed by two or more degrees (for example, the number two sixes), electronics entire operation divided into two parts. Six of the first ranks five, and the release shaft for inclusion in twos. This downshift handles the complex DSG for 0.9 s

Ordering with DSG is the same as with the classic controller. Gear selector lever in position "D" is the standard mode Drive. Sport mode "S" allows the driver to ride sharper by the control unit engine and gearbox together with wheel rotation sensors (eg different speed bike show on the road curve) and prevent accidental shift up during cornering. The "Tiptronic" shift lets the driver to select gears, the driver can be used as buttons on the steering wheel, the classic voter.

Order with DSG

In the "S" and "Tiptronic" transmission offers the "Launch Control", which ensures an effective and quick acceleration. Simply depress the brake at the same time add full throttle, the engine automatically adjusts the speed to 3000, after releasing the brake and acceleration even brisker.

Launch Control function

Dual-clutch gearbox DSG is celebrating significant achievements. In recent years, and are more competitive car variants dvouspojkového your order. DKG (BMW), Getrag PowerShift (Ford, Volvo, Chrysler, Mitsubishi) PDK (Porsche).

At present, dual-clutch gearbox produces several companies - Getrag, Ricardo or Borg-Warner, and now joined them also Italian-Swiss company Oerlikon Graziano. Globally, perhaps not one of the largest (in Europe annually sells 20,000 gearbox), the more interesting, however, is its clientele. The customers include Ferrari, Lamborghini, Maserati and Aston Martin.

Text: John Sajdl
Photo: www.media.vw.com, www.photobucket.com, archive
Keywords: automatic, dual-clutch gearbox DSG, Direct Shift Gear, sort