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Old April 12th 11, 02:44 PM posted to rec.autos.tech
C. E. White[_2_]
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Posts: 617
Default Automatic vs. Manual transmission


"Mr.E" > wrote in message
...
>
> http://www.egmcartech.com/2009/01/21...matic-gearbox/
>
>
>
> In Europe, Ford currently offers a PowerShift transmission in the Ford
> Focus. This PowerShift uses a twin wet-clutch system to handle the
> higher torque levels of the 2.0-liter TDCI engine available in the
> Focus.
>
> In North America, a dry-clutch derivative of Ford's PowerShift
> transmission will be used for added efficiency and durability. A dry
> clutch transmits power and torque through manual transmission clutch
> facings, while most automatic transmissions utilize wet clutch plates
> submerged in oil. As a result, the dry-clutch PowerShift transmission
> does not require an oil pump or torque converter, providing superior
> mechanical efficiency.
>
> "A dry clutch is a real sweet spot for lighter vehicle applications,"
> said Piero Aversa, manager, Ford Automatic Transmission Engineering.
> "PowerShift is more efficient, it saves weight, is more durable, more
> efficient and the unit is sealed for life, requiring no regular
> maintenance."
>
> PowerShift, unlike conventional automatic transmissions, does not need
> the heavier torque converter or planetary gears. In addition, the
> dry-clutch derivative eliminates the need for the weighty pumps,
> hydraulic fluids, cooling lines and external coolers that wet clutch
> transmissions require. As a result, the dry-clutch PowerShift
> transmission can weigh nearly 30 pounds less than, for example, the
> four-speed automatic transmission featured on today's Ford Focus.


Thanks very interesting...but what operates the dry clutches? The article
says "electro-mechanical"...so does this mean a solenoid(s)?

Ed


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