2015 BMW 2-Series Active Tourer xDrive

2015 BMW 2-Series Active Tourer xDrive
http://auto-rev.blogspot.com/2014/12/2015-bmw-2-series-active-tourer-xdrive.html

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Since the premiere of the first four-wheel drive BMW 325i in 1985, BMW has consistently expanded its four-wheel drive competence with new models and constant further development in the field of drive technology. One of the milestones is undoubtedly the intelligent four-wheel drive system BMW xDrive, which was first used in the BMW X3 and the X5 in 2004 and is now available for numerous models and series. Even at that time, engineers did not focus solely on improving traction and vehicle stability. In addition to a high degree of functionality and enhanced cornering dynamics, the minimisation of system-related losses and constant weight reduction are top priorities set to keep the fuel consumption and emission levels of four-wheel drive vehicles as low as possible. To this end, the intelligent four-wheel drive system BMW xDrive is always aligned to each vehicle concept (Sedan/Coupe, SAV, SAC) with the aim of implementing the optimum solution.

Premiere: BMW xDrive complements front-wheel drive concept.

The latest example of model-specific alignment of the four-wheel drive system is provided by the BMW 2 Series Active Tourer. The fundamental difference to previous variants is that, for the first time, BMW xDrive is premised on a front-wheel drive concept with transversally installed engines. The Active Tourer has already proven that front-wheel drive technology fully meets the brand’s demands in terms of driving dynamics. This is largely owed to the new range of modularly constructed three- and four-cylinder engines which, thanks to state-of-the-art TwinPower Turbo technology, excel to an equal extent through high performance characteristics and outstanding efficiency. With the BMW 225i xDrive Active Tourer (fuel consumption combined: 6,5–6,4 l/100 km; CO2 emissions combined: 152-148 g/km)* and the BMW 220d xDrive Active Tourer (fuel consumption combined: 4,8-4,6 l/100km; CO2 emissions combined: 127-122 g/km)*, the intelligent four-wheel drive system is now available for top-of-the-range power units to further improve traction, vehicle stability and cornering dynamics, with the aim of enhancing safety and driving pleasure. Both models feature BMW xDrive as standard in combination with the 8-speed Steptronic transmission.

Slender, lightweight four-wheel architecture.

The slender architecture featuring compact, lightweight components and the resulting low amount of space required by the new four-wheel drive system are excellently suited to the concept of the BMW 2 Series Active Tourer. Thus the additional weight of the entire four-wheel drive technology is only around 61 kg. Furthermore, measures for reducing system-related losses and an energy-efficient operating strategy ensure extremely favourable fuel consumption and emission levels.

Power from the front drive to the rear axle is transferred by means of an angular gear (Power Take-Off) on the front differential and a two-part cardan shaft. The central component of the four-wheel drive system is an electro-hydraulically controlled multiple-disk clutch (Hang-On) inside the rear axle drive, which facilitates infinitely variable distribution of torque to the front and rear wheels. The corresponding commands are provided by an electronic control unit which, like the hydraulic pump, is located on the rear axle.

Power Take-Off: angular gear and two-part cardan shaft.

The angular gear is mounted behind the engine on the automatic transmission and crankcase. The input shaft is a hollow shaft construction and directly connected to the front axle differential. In this way, part of the drive force is transferred from the differential basket to the cardan shaft via the hollow shaft, the crown wheel and the pinion shaft. The angular gear operates at a fixed gear ratio (1:1.74) and is permanently engaged, meaning that the cardan shaft always rotates when the vehicle is driven. Reversal of transmission takes place in the rear axle drive so that the front and rear axle drive shafts both rotate at exactly the same speed.
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