Post on 25-Mar-2020
Automotive Service Modern Auto Tech Study Guide Chapter 57 Pages 10831109 Automatic Transmissions 17 Points
Automotive Service 1. An automatic transmission senses engine _________ and engine ________
to determine shift points.
Speed, Load Torque, Speed Load, Vacuum
Automotive Service 2. Internal hydraulic pressure is used to _____________ gears. A PCM can also
be used to sense conditions and actuate hydraulic pressure to control shift points inside of an automatic transmission (AT).
Shift Cancel Delete
TQC
P u m p
Valve Body
Planetary Gear Sets Clutches
Bands
Governor
Vacuum Modulator or
Throttle Valve PCM & Shift Solenoids
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Automotive Service 3. Automatic transmissions use __________, ______________ & _________ as
methods to transmit power.
Fluids, Friction Gears Fluids, Blood, Skin Fluids, Friars, Gears
Automotive Service 4. The main external parts that make up an AT are the _______ housing,
transmission ________, oil _____, and the extension housing at the rear.
Bell, Case, Pan Dell, Case, Pan Well, Case, Pan
Automotive Service 5. The ___________ __________________ is a fluid clutch that is the means
of coupling and uncoupling the engine from the transmission. ATF is the fluid used inside the transmission. It’s color is red.
Flex Plate Torque Converter Harmonic Balancer
Automotive Service 6. Besides the housing, a converter is made up of the __________________ or
pump (input), the _________, which is the driven or output member, and the stator, which is designed to improve oil circulation inside.
Impeller, Compressor Impeller, Turbine Propeller, Turbine
Automotive Service 7. The ________ __________ connects the crankshaft to the torque converter &
holds the starter ring gear.
Fly Wheel Flex Plate VIN Plate
Automotive Service 8. A ____________ torque converter improves fuel economy (mpg) by directly
connecting the engine to the input shaft of the transmission. PCMactuated, it takes away lost motion from inside the torque converter.
Lockup Backup Wrapup
Automotive Service 9. An AT has an _________ shaft or turbine shaft and an ____________ shaft
on the same axis or centerline.
Input, Output Input, Turbine Turbo, Output
Automotive Service 10. Automatic transmissions use _________________ gear sets, consisting of
a sun gear, planetary pinions in a carrier and an internal ring gear. Reductions, directs, overdrives, reverse, & neutral are all possible!
Helical Hypoid Planetary
Automotive Service 11. Wet, multidisc _________________ and __________ are the friction devices
used to drive and lock planetary gear set components in order to achieve different gear ratios and directions of rotation.
Clutches, Flywheels Clutches, Bands Clutches, Torringtons
Automotive Service 11. Wet, multidisc _________________ and __________ are the friction devices
used to drive and lock planetary gear set components in order to achieve different gear ratios and directions of rotation.
Clutches, Flywheels Clutches, Bands Clutches, Torringtons
Automotive Service 12. Clutches are applied by fluid pressure and released by _______________.
_______ are actuated by hydraulic servos, which are a form of “apply pistons”.
Springs, Bands Springs, Discs Springs, Drums
Automotive Service 13. Bands are steel ___________ with linings of friction materials.
They clamp around clutch drums to stop rotation. Bands are often adjustable, sometimes even from the outside of the transmission case.
Straps Belts Springs
Automotive Service 14. Oneway roller or sprag clutches are often called ______________ clutches.
They can hold in one direction and allow components to spin freely in the other direction. They operate instantly without fluid pressure.
Underrunning Overrunning Marathonning
Automotive Service 15. Transmission ______________ are needed because of the tremendous heat
developed in the converter.
Heaters Inverters Coolers
Automotive Service 16. The transmission __________ generates the fluid flow needed to develop
pressure to apply hydraulic components and the fluid flow for lubrication.
Pump Sump Dump
Automotive Service 17. The manual valve is operated by the action of the ____________ selecting
gears. The _______________ modulator valve senses engine load and the _______________ valve senses vehicle speed. Both are used to determine shift points. The kick down valve is used to downshift for fast acceleration (passing gear).
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Automotive Service CVT Continuously Variable Transmission
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Automotive Service The easiest way to remember which mode a planetary gearset is in is to look at the planetary carrier.
Carrier drives = overdrive Carrier driven = reduction Carrier held = reverse Two members held = direct drive Nothing driven or held = neutral Parking Pawl engaged to the output shaft = park