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ZF reveals 9HP - 9 Speed automatic transmission

By SYF77 on 25 Jun 2011

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About 4 years ago in May 2007, ZF unveiled their 8 speed automatic transmission which found its place under the bonnets of the BMW 760LI saloon, Rolls-Royce Ghost and many others. In the quest for efficiency, car manufacturers have increased the number of gear selection to their products and even a base model such as the latest BMW 1 series is benefiting from an 8 speed transmission. Recognizing such a need, ZF launched the world’s first 9-speed automatic transmission for passenger cars in the VDI Conference “Transmissions in Vehicles 2011”.

The new gearbox, code-named 9HP, is designed for cars with front-transverse drive. It is available in two model ranges and can handle torque between 280 and 480 Nm. It can be combined with start/stop systems, hybrid setup or all wheel drive application according to manufacturer’s requirements. The 9HP is, by default, compatible with stop-start systems without the need for an additional oil pump. It can also be deployed in parallel hybrid architectures, in which case the torque converter is replaced by an electric motor.

According to ZF, the 9HP offers fuel savings up to 16% compared to today’s 6-speed automatic transmissions in front-wheel drive cars. This is attributed to the extremely high total spread of 9.84, and the high number of gears that allow the engine to run in the most fuel efficient speed range. For example, in the 9th gear, one can travel at 120 km/h with the engine running at just 1,900 rpm, compared to 2,600 rpm in a 6-speed auto. ZF states that it has designed all components for faster response and shift times are actually below the threshold of the driver’s perception, even though it uses a standard torque converters instead of the increasingly popular dual clutch configuration.

On a seperate note, perhaps its high time that the 4 speed or even 5 speed auto transmission make its way to the museum.

new technology and 5 more...

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Written by SYF77
I have been a car fanatic since 1989, when my father was changing our family car then to a Toyota Corolla 1.6 GL fitted with a Twin Cam 16 valve engine that was carburetor-fed, a big deal back in those days. The automobile technology and industry fascinates me and I hope to broadcast these interesting developments to everyone out there through this blog.

  • 1
ER-3682 Jun 25 2011 03:42 PM
Ageed,most Japanese car still using 4 speed Auto[2L camry].....
Friendstar Jun 26 2011 11:25 AM
with 9 speed.... comes 10 speed... comes more speed

might as well CVT?
  • 1
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