Ford patents eleven-speed automatic transmission
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As was revealed recently, the Ford Motor Company has filed a patent in the United States that documents the development of an eleven-speed automatic gearbox in several configurations — a cool reference to Spinal Tap? But to understand it better we decided to take a look at the actual gear ratios to determine just what makes this 'box different to existing Ford units. The patent filing, which was published this month, follows an announcement in early 2013 that Ford and GM were working on a joint venture to develop a ten-speed automatic gearbox, which will feature in the 2015 Ford F-150 Raptor. Like most manufacturers, patent filings are created for everything from engineering concepts through to production designs. This particular application appears to be the former, given the lack of detail and reference to several potential configurations. Key to the concept is a transmission that offers eleven forward gears and one reverse gear. The transmission is detailed in three configurations: - One design includes four simple planetary gear sets, four clutches and two brakes. - The second design includes two axis transfer gear pairs, three simple planetary gear sets, four clutches and two brakes. - The third design includes four simple planetary gear sets, four brakes and two clutches.