Nine-speed automatic transmission

  • 14-Feb-2013 12:07 EST
ZF 9HP_Schnittbild.jpg

ZF Friedrichshafen’s 9HP nine-speed automatic transmission was designed for passenger cars with front-transverse engine configurations. A construction kit principle design allows transmission customization to accommodate various starting elements and all-wheel-drive applications. The setup also can be implemented in space-restricted installation conditions. Model ranges cover 150 to 355 lb·ft (200 to 480 N·m). Four individual gear sets are nested within the transmission, with six shifting elements and nine gears sets. The 9HP also features interlocking dog clutches for power shifting; hydraulically operated constant-mesh elements reduce overall transmission length and optimize efficiency. With a total gear spread of 9.81, the 9HP improves fuel economy and achieves small gear ratios. RPMs are lowered by approximately 700 at a speed of 75 mph (120 km/h), reducing noise. A torque converter is the 9HP’s standard starting element, and a multilevel torsion damper system minimizes hydraulic losses. More information from ZF is available here.

HTML for Linking to Page
Page URL
Rate It
0.00 Avg. Rating

Read More Articles On

Thermal imaging data obtained from a FLIR high-performance camera shows that the expected turbine output temperature is approximately 285°C when the helicopter is in forward flight. However, during hover operations a steady state temperature of about 343°C will be reached.

Related Items

Technical Paper / Journal Article
Training / Education
Training / Education
Technical Paper / Journal Article