ZF confirms 8Speed auto — Volkswagen Passat Lingyu

18 Июн 2015 | Author: | Комментарии к записи ZF confirms 8Speed auto — Volkswagen Passat Lingyu отключены
Volkswagen Passat Lingyu

UK: ZF confirms plans to manufacture auto

At two separate events ZF publicly confirmed rumours it is developing a new 8-speed automatic for launch in 2010. This the introduction by Mercedes -Benz of its W7A-700 in 2003, and more the Aisin TL-80SC (=Toyota AA80E) 8-speed automatic, is fitted in the Lexus LS460 writes Chris Guile, analyst at CSM Worldwide .

The new ZF ‘8HP’ will, like its 5HP and 6HP predecessors, be in passenger car applications with mounted engines, and rear-wheel or drive configurations. It will, be no surprise to learn that the 1st for the 8HP will be the new BMW 7-Series [F01], CSM Worldwide is currently forecasting to in late 2008, rather 2010.

With subsequent likely to include several BMW cars, plus those the VW/Audi Group and the Ford ZF has ambitious plans for the 8HP, to supply 1.1 million units by 2013. However, this may be a scenario, in which GM decides not to ZF with an 8-speed, and loses its with BMW (currently both ZF and GM automatics to BMW). This be great news for ZF, but not so good for which has been able to the two suppliers off against each in terms of price and technical But even assuming this plays out, ZF will that it has a new competitor to contend in the form of Getrag, which by then have been BMW with the 436 (7DCI600) Dual Transmission (DCT) for a couple of So, maybe BMW won’t be in such a bad after all.

In the past there has only limited competition between two independent transmission suppliers, ZF concentrating on automatics, and Getrag on the But the new DCTs will change all of with both of the companies to get a foothold in this new market so far, Volkswagen has had a monopoly its wet-clutch DQ250 and the Ricardo DL1300 which is fitted to the Veyron [BG824].

As mentioned BMW will not be the only customer for the new with all consumers of the current 6HP potential targets. This is true as the 8HP is said to have a package size and weight possibly even cost) to the making them essentially But these transmission changeovers only occur at certain for a given vehicle, such as a new launch, a mid life-cycle refresh, or a new or re-engineered engine is added to the line-up. For this reason is a limit to how quickly ZF could out the 6HP, and ramp up volumes of the Based on our current assumptions, CSM is forecasting that demand for the 8HP rise to about 900,000 by 2013, compared to the 1.1 million by ZF.

Despite now concentrating on its 1st and 2nd generation 6HP and new 8HP it might seem surprising to that ZF still manufactures a number of its old 4-speed 4HP programs, in for use in the Peugeot 407 [D2], whilst the 5HP is still supplied to Porsche. and Volkswagen. One production line for the 5HP has already been shipped to where it supplies the Volkswagen [VW451/1]. And in the next few years, CSM expects to see a 6HP line being from the German Saarbrüken to China, as demand falls in in favour of the 8HP.

In terms of technology, the 8HP does with the Lepelletier design of the 6HP, opting instead for 4 planetary gear-sets, with 5 elements, compared to the 3 gear-sets and 5 elements for the 6HP. By minimising the of open clutches/brakes to just in any gear, ZF believes it has improved the of the transmission, based on computer The reason that the open and brakes are important is because lose energy in the form of to the fluid that surrounds

Additional efficiency gains from the gears themselves, the 6HP gears having between 96% and efficiency, while the 8HP has between 98% and efficiency. This 100% is achieved only in 6th gear, has a direct or 1:1 ratio between and output. These differences, some other contributing factors, leads ZF to believe the 8HP will be up to 6% more efficient the recently launched 2nd generation This now puts the automatic up against the manuals and newer in terms of efficiency, an issue has been worrying automatic for some time.

The ratio spread (the between first and top gear) is increased from 6.04 on the to 7.01 on the 8HP. This both a higher ratio in gear, for better launch and a lower top gear ratio, for engine speed when the is at cruising speeds — being particularly important for engines. It also enables the between gears to be smaller, results in better acceleration and shifting quality.

ZF says the 8HP is capable of using different of start-up or launch devices, suggests that it could the torque converter with a much like it did on the 7-speed automatic which was shown in In addition, ZF also say that it is of being used in a mild configuration, or a full hybrid with the torque converter by a motor, resulting in an identical size.

So what of the competitors will they follow ZF to 8 or above? Well, Mercedes-Benz is carrying out further developments to its having recently launched a new which combines the transmission and case, for use in its 4 wheel drive applications. This W7A-700 W7X-550 variant) has a ratio of 6.0, which Mercedes-Benz almost certainly want to with the next design possibly with a clutch of a torque converter, although will tell if this is a 7, 8 or 9-speed.

And as for GM, it has only recently launched its new automatics (6L45, 6L50, 6L90), so may not have the time to an 8 or 9-speed to compete with ZF. GM could make better use of its and investment in developing DCT technology

ZF claims that 8 forward is an optimum, resulting in lower consumption and a higher ratio calculated following extensive of many different configurations. But it happens to be one more gear the Mercedes-Benz W7A-700, which is its most direct competitor.

One that has been used to the proliferation of gears is that, in cases, the drivers of premium with 6 or 7 forward gears don’t even realise it, so is the point of giving them Well, the usual justification is consumption, and ZF is no exception, but there has to a point where the efficiency of the extra gears is outweighed by the gear-set losses. Plus, the of those same vehicles don’t care about the costs, so perhaps this is about one-upmanship between the

Chris Guile is a Powertrain with CSM Worldwide.

ZF 8HP Preliminary

Torque Capacities: Two versions c.500/550N.m and c.750/800N.m

Configurations: RWD and AWD (including transaxle)

Weight: Gear Ratios:


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