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The Haldex clutch: turning front-wheel drive into four-wheel drive

1/20/2012

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Picture
_One of Volkswagen’s star cars at the recent Tokyo Motor Show was the 2012 Passat Alltrack.  More than an all-wheel-drive Passat Estate, this, it says, has real off-road ability.  Open to order in April, it arrives in July.  At its heart is the Haldex 4x4 system – now much more sophisticated than a part-time 4x4 device.

The motor vehicle’s classic drivetrain evolved before the First World War.  A front-mounted engine “face forward” (radiator ahead) and drive out of the back to a gearbox which transmitted power by way of a propeller shaft to the rear axle.


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