Transmission Fundamentals Part A Flashcards
The function of a transmission is to only provide a means of increasing torque.
True
False
False
The engine, transmission and other powertrain components must be carefully matched in order to achieve maximum service life in a specific vehicle and operating application.
True
False
True
Some vehicles carry loads over short distances at low speeds. Other vehicles pull loads over long distances at high speeds. An identical transmission in terms of gearing and torque handling capacity should be used in both applications.
True
False
False
Identify three types of commonly used synchronizer assemblies.
- Block type synchronizers.
- Pin type synchronizers.
- Plate and disc synchronizers.
Identify three advantages of a multiple countershaft transmission.
- The countershafts, bearings and housings can be lighter because of the smaller forces they are required to withstand.
- Floating design eliminates the need for bearings between the mainshaft and the mainshaft gears.
- The gear width can be half as wide due to the doubled tooth contact area. As well, less expensive spur gears can be used, eliminating the need for thrust control washers.
Multiple countershaft transmissions use several housings. These housings are kept in alignment through the use of:
a. shouldered bolts
b. precise doweling
c. tapered plugs
d. floating cap screws
b. precise doweling
In a single countershaft constant mesh transmission, the countershaft gears:
a. are floating on the countershafts
b. are in constant mesh with the mainshaft gears
c. are identical from one countershaft to another.
d. are all individually replaceable.
b. are in constant mesh with the mainshaft gears.
What is used to reduce transmission noise from being transmitted up into the cab?
a. a vibration dampener
b. a hollow shift lever
c. a plastic pin
d. an isolator
d. an isolator
Identify the function of a detent system.
A detent system helps hold the shift rails in neutral or a selected position during operation.
Identify the function of a spring loaded plunger.
The spring loaded plunger prevents the operator from selecting first or reverse when the vehicle is moving forward at a great speed.
The formula for determining gear ratio is the number of teeth on the driven gear divided by the number or teeth on the drive gear.
True
False
True
An engine that develops high torque over several hundred rpm can be coupled with a transmission that has fewer gears.
True
False
True
Explain two functions of a synchronizer assembly.
a. to match or syncronize the speed of a main shaft gear with the speed of the mainshaft during the shifting process.
b. to temporarily connect a selected mainshaft gear to the mainshaft once the speeds of the mating parts have been synchronized.
Multiple countershaft transmissions only have two countershaft assemblies.
True
False
False
When a multiple countershaft transmission is used, the main transmission section often has 5 forward gear selections.
True
False
True
