Automotive Service Modern Auto Tech Study Guide Chapter

Automotive Service Modern Auto Tech Study Guide Chapter 55 Pages 1049 -1069 Manual Transmissions 15 Points

Automotive Service 1. A _______ transmission must be shifted by hand to change the amount of torque going to various parts of the drive train. Manual Automatic Hybrid

Automotive Service 2. Automatic transmissions use __________ pressure and sensing devices to detect engine speed and load. Resulting shifts take place based on a shift program. A fluid coupling called a torque converter is used to connect the engine to the transmission instead of a dry, friction-type clutch. Hydraulic Automatic Pneumatic

Automotive Service 3. A ________ combines both a transmission and a differential in the same housing. Both front wheel drive and rear wheel drive vehicles have used transaxles. They may be either manual or automatic Multimeter Differential Hybrid

Automotive Service 4. Transmissions are designed to change the vehicle’s drive wheel speed and ______ in relation to engine speed and torque. Without a transmission, an engine wouldn’t develop enough power to accelerate from a standstill! Gears are used to change torque: Gear ratios of greater than 1: 1 are reductions in speed and gains in torque (1 st, 2 nd, 3 rd) Gear ratios of exactly 1: 1 are direct drives with no change in torque or speed (4 th) Gear ratios of less than 1: 1 are overdrives or increases in speed and losses in torque (5 th) Torque Power Wattage

Automotive Service 5. In low gears, the crankshaft must turn several times to make the input shaft turn once. This increases _______ to the wheels, but reduces vehicle speed. This condition is known as a gear reduction. Horsepower Torque Wattage

Automotive Service 6. In higher gears, the crankshaft speed matches input shaft speed or even exceeds it. This decreases _______ to the wheels, but increases vehicle speed. This condition is known as an overdrive. Torque Power Pressure

Automotive Service 7. Gear ______ are calculated by dividing the # of teeth on the driven gear by the # of drive gear teeth. Gear Ratio A mathematical comparison of either the# of teeth or the diameter or the radius used to determine mechanical advantage Fractions Proportions Ratios Output # of Teeth ÷ Input # of Teeth = Gear Ratio

Automotive Service Input 9 teeth Output 12 teeth 9÷ 9=1 Direct Ratio 1: 1 12 ÷ 8 = 1. 5 Reduction Ratio 1. 5: 1 Input 8 teeth Output 8 teeth Input 12 teeth 8 ÷ 12 =. 66 Overdrive Ratio. 66: 1

Automotive Service 8. ____ gears have teeth cut parallel to the axis of rotation. _______ gears have their teeth cut at an angle to their axis of rotation. Angled teeth on helical gears are stronger & quieter than spur gears. Spur Gears Spur, Bevel Spur, Helical Spur, Worm Helical Gears

Automotive Service 9. Most cast iron case, manual transmissions are ______ - lubricated with SAE 80 w 90 gear oil. Many aluminum case, manual transmissions are lubricated by ATF. Always check specs before adding fluid. Splash Pump Externally

Automotive Service 10. Bearings inside of transmissions are usually the ________ type such as needles, balls, or rollers. Friction Anti-Friction Bushing

Automotive Service 11. Manual transmissions typically have four internal shafts: the ____ shaft - splined to the friction disc, the ___________ - also called the cluster shaft, the ________ shaft, and the _______ shaft or main shaft which is connected to the drive shaft to turn the wheels. Mentioned in this picture below

Automotive Service 12. Gears are in constant mesh but are not connected to the output shaft until _________, operated by shift forks move them into engagement. Terminator Synchronizer Economizer

Automotive Service 13. Synchronizers consist of ________ rings, and a _______ that slides over a hub which is splined to the output shaft. Splines are multiple grooves cut into a shaft designed to hold gears in place. Bauk, Spur Blocking, Sleeve Nub, Sleeve

Automotive Service 13. Synchronizers consist of ________ rings, and a _______ that slides over a hub which is splined to the output shaft. Splines are multiple grooves cut into a shaft designed to hold gears in place. Bauk, Spur Blocking, Sleeve Nub, Sleeve

Automotive Service 14. Transmissions may have 3, 4, 5, or even 6 forward _______ (gear ratios) plus reverse and neutral. Speeds Sleeves Torques

Automotive Service 15. The transmission may contain the ____ - ____ light switch which is used to turn on the reverse lights. Brake-Stop Back-up Start-Stop

Automotive Service

Automotive Service

Automotive Service

Automotive Service