nissan juke concept versiyon
4x4 system and torque vectoring. Juke will be available with a newly developed version of Nissan’s ALL-MODE 4x4-i electronic all-wheel-drive system. By default this drives the front wheels only, but can split torque 50/50 front to rear and can also now split torque from side to side across the rear axle. This ‘torque vectoring’ system is similar to that recently introduced on much more expensive vehicles like BMW’s X6 and the new Porsche 911 Turbo. Nissan says the Juke’s torque vectoring system is noticeably lighter and more compact than other systems.All torque vectoring systems follow a similar layout, with a system of gears which can transfer torque from one side of the rear axle to the other under computer control.By monitoring vehicle speed, wheel speed, gear, steering angle, lateral acceleration and vehicle yaw (turning) rate, the system can channel more torque to the outside rear wheel in corners to cut understeer and enhance the Juke’s cornering ability. Nissan says up to 50% of the total available engine torque – in other words, the whole output of the rear axle – can be sent to either rear wheel. Though the technology has been seen before, it's interesting that Nissan has decided to use it on such a small and (relatively) low-priced vehicle.
Manual and automatic gearboxes.The manual transmission, in five-speed and six-speed versions, has been carried over largely unchanged from Qashqai. The XTRONIC CVT unit used with the non-turbo 1.6-litre petrol engine is 10% shorter than before and 13% lighter, while internal friction has been reduced by a remarkable 30%. Nissan claims that this unit is the world’s first CVT with a sub planetary gear, allowing a far higher transmission ratio – 7.3:1 – than previous Nissan CVTs. Smaller, lighter pulleys, a flexible lock up damper and a more efficient oil pump all promote great fuel efficiency. The XTRONIC CVT with six-speed manual mode, which is available in the turbocharged petrol-engined Juke, has been tuned for a more sporting performance with revised manual modes which are said to offer sharper acceleration.
Suspension: The Juke’s front suspension is conventional supermini, with MacPherson struts. The Juke adds a subframe which is said to improve the stiffness of the front end, reducing sideways deflection to improve handling and ride comfort. While two-wheel drive Jukes have a torsion beam rear suspension which is common on superminis, the four-wheel drive versions get a new multi-link rear suspension similar to that on the Qashqai. Nissan claim the Juke’s roll centres front and rear are low, improving rough-road stability and leading to handling at the top of the supermini class despite the higher centre of gravity inevitable in a crossover with generous ground clearance. Speed sensitive electric power steering is standard on all models. One novelty is that Juke incorporates a ‘ring structure’ which connects the upper body to the rear suspension mountings to increase torsional rigidity, benefiting ride and handling.
