двойно задвижване при Ferrari FF

[nightroller]

Колеги,от известно време се мъча с тази загадка, значи колата има двойно задвижване а е транзаксиал, при предните колела има два съединителя за полуосите и някакъв редуктор но не мога да разбера как променя предавателните числа и въобще как се синхронизира.

Темата е с чисто любознателен характер и няма отношение към Алфа Ромео, моля всеки, който знае да ми обясни колкото може по-добре.

Благодаря ви предварително.

[Furious 155]

http://en.wikipedia.org/wiki/Ferrari_FF
бледо, но някакво описание -
Four wheel drive system

The new four-wheel drive system, engineered and patented by Ferrari, is called 4RM: it is around 50% lighter than a conventional system, and provides power intelligently to each of the four wheels as needed.[3] It only functions when the manettino dial on the steering wheel is in the "comfort" or "snow" positions, leaving the car most often in the traditional rear wheel drive layout.[10]

This system is based around a second, simple, gearbox (gears and other components built by Carraro, taking power from the front of the engine. This gearbox (designated "power take off unit", or PTU) has only two forward gears (2nd and 4th) plus reverse (with gear ratios 6% taller than the corresponding ratios in the main gearbox), so the system is only active in 1st to 4th gears. The connection between this gearbox and each front wheel is via independent haldex-type clutches, without a differential.[11] Due to the difference in ratios "the clutches continually slip"[12] and only transmit, at most, 20% of the engine's torque. A detailed description of the system (based on a conversation with Roberto Fedeli, Ferrari's technical director) has been published.[10]

[kolev]

и източника
http://blogs.insideline.com/straight...ve-system.html

http://blogs.insideline.com/straight...s-4rm-awd.html

[The_Game]

Не предполагах, че е толкова сложно