Automobilzulieferer ZF gives a view of the fourth generation its proven Eight-speed automatic transmission, From 2022 should the gearbox in modular Tobe offered. Depending on the application, the gear set for Mild and plug-in hybrid drives be used. Without electrical components and with classic torque converter, it can also be used for classic vehicles with a pure combustion engine.
Burners continue to be the means of choice
Currently it is not clear how the drive mix develop in motor vehicles. ZF estimates that by 2030 around 30 percent of all legal vehicles purely electric be on the way. So that would be so 70 percent still in one form or another internal combustion engine fitted. Reason enough for ZF to equip its transmission for all coming events. The manufacturers also appreciate that, which is why they shop industriously for the Swabians. Awarded in early 2019 BMW a double-digit billions order over the coming 8HP transmission to ZF. In July, joined FCA (Fiat-Chrysler).
Modular construction is the key
The secret of ZF's next 8HP transmission is its modular construction, Each configuration receives the same mechanical eight-speed gearset. He will continue to come four planetary gear sets and five switching elements, but could minimize friction losses in detail. It is interesting, however, what happens before this gear set. mild hybrids can get the electric drive either before the transmission, so on the crankshaft at the engine output – or alternatively in front of the converter on the transmission input shaft. The electric motor can achieve a maximum power of 25 kW.
Plug-in hybrids wear the new 8 HP electric motor instead of a torque converter in the bell housing. The drive developed by ZF brings it up maximum 160 kW and 450 Nm. Thus, the transmission can also be used for larger vehicle classes. This is made possible by the renunciation of classic copper windings. Instead, put the Friedrichshafen on the “Hair-pin method”in which welded together, square copper wires significantly increase the power density. Depending on the power requirement, there are more or fewer wires around the collector. For conventional drives the transmission simply loses the electric elements, and it gets a classic torque converter,
Frame size remains the same
No matter how the transmission is used, it always stays same size, This provides the vehicle manufacturers flexibility, You do not have to plan now, which drive types will be queried by customers in the future. So the manufacturer is developing a floor group and can adapt the transmission flexibly.
To make this possible, ZF has the power electronics for the hybrid drives integrated into the transmission. This electrical component converts the direct current from the battery into the alternating current required by the electric motor and also regulates the electric machine in terms of power and speed. So far, this component usually found its place in the car near the trunk. Due to the integration in the gearbox housing less cables are necessary. This saves weight and eliminates sources of error. Since the electronics develop a lot of heat, it is cooled down via the cooling circuit of the air conditioning.
From 2022 in production
The transmission will installed longitudinally
and aims at that Premium segment
, It will be more likely to be found in larger cars. From 2022
should production in Saarbrucken
start. A little later, the transmission but also in the USA and China
produced for the respective markets.