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The ZF 9HP is a nine-speed automatic transmission built by ZF Friedrichshafen AG subsidiary ZF Transmissions in Gray Court, South Carolina. It is a front-transverse transmission, used in front-wheel drive and all-wheel drive vehicles. ZF claims that it is able to save an average of 16% in fuel compared with current 6-speed automatic transmissions. The gear ratio spread is 9.81:1. The transmission has a torque range between 280 and 480 Nm.〔 The 9HP is only 0.24 inches (6mm) longer than, and weighs 16.5 lbs (7.5 kg) less than, the outgoing six-speed transmission. The compact packaging is achieved by using a number of innovative design features: a new compact hydraulic vane-type pump, two patented dog clutches, which replace bulkier conventional clutch packs, and a nested gear set. Land Rover and Jeep demonstrated the world's first nine-speed automatic transmissions for a passenger car at the 2013 Geneva Motor Show.〔 The 2014 Jeep Cherokee had the world's first nine-speed automatic transmission for a passenger vehicle to market. The transmission has been problematic, as customers of Jeep, Chrysler, and Acura models equipped with the transmission have experienced shifting problems in their vehicles. ==How It Works== An Animated Drive Line Schematic & A Rotational Speeds Nomogram File:ZF 9HP Animated Schematic Drive Line & Nomogram.gif These ordinates are positioned on the abscissa in strict accordance with the proportions of the sun gears' teeth numbers relative to those of their rings. Consequently, the output ratios on the ordinate C4 (''carrier of the last planetary gearset RS4'') follows closely to those of the actual transmission. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ZF 9HP transmission」の詳細全文を読む スポンサード リンク
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