The Parts Inside Your Automatic Transmission

PARTS INSIDE YOUR TRANS MISSION PLANETARY GE ARSET Creates all of the gear ratios used by the transmission Three primary components: (1) Sun gear (2) Planet gears (3) Ring gear • Planet gears revolve around sun gear • Gear ratios determined by which gears are locked and which are unlocked TORQUE CONVE RTOR Indirectly connects the engine to the transmission • Shaped like a big donut • Main components: impeller (pump), turbine, stator (guide wheel) • Transmission fluid is sent from the impeller to the turbine, causing them both to spin • Stator sends the fluid back to the pump • Modern transmissions lock the impeller and turbine together around 40 mph to improve overall efficiency | impeller stator turbine SENSORS • Sensors decide which gear is needed based on cngine speed and wheel speed • The brains of your transmission CLUTCE PACH/BANDS Shift the gears • Many automatic transmissions use either a clutch pack or bands - Clutch pack: Fluid is applied to the clutch pack, the piston engages, and the transmission sends power to the wheels - Bands: Fit around the clutch housing, tightening to engage the gears and loosening to disengage them OUTPUT SHAFT AND AILES Connect transmission to wheels output shaft The transmission turns the output shaft Output shaft is connected to the axles - Axles turn the wheels Infographic provided by MIRAMAR TRANSMISSION MIRAMAR http://www.transmissionsandiego.com/ TRANSMISSION Sources: http://www.edmunds.com/car-technology/automatic- transmissions-what-makes-them-work.html http://auto.howstuffworks.com/automatic-transmission1.htm http://www.carparts.com/transmission.htm http://en.wikipedia.org/wiki/Automatic_transmission#History_and_improvements