401Db: Transmission Fundamentals Flashcards
The auxiliary section of a transmission can havve which of the following arrangements?
a) two-speed
b) three-speed
c) four-speed
d) all of the above
d) all of the above
401Db
What type of gearing can the auxiliary section have?
Range & Splitter
or
Range & Deep Reduction
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Where in an auxillary transmission is a synchronizer typically found?
Range Shift
On the mainshaft between the low and high range gears
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How is the auxillary transmission output shaft held in position?
By two tapered roller bearings in the rear bearing housing
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What gearing combination is provided by a two-speed auxiliary section?
Deep Reduction
Direct
What gearing combination is provided by a three-speed auxiliary section?
Deep Reduction
Low Range
High Range
What gearing combination is provided by a four-speed auxiliary section?
Low range & low split - Large Reduction
Low range & high split - Small Reduction
High range & low split - Smaller Reduction
High range & high split - Direct
401Db
What type of lubrication method is most common on transmission?
Splash
401Db
To aid a splash lubricated transmission, what is used to direct oil to critical areas of the transmission?
- Galleries cast in the housing
- Bolt-on troughs
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How is oil in a splash lubricated transmission filtered?
- Magnetic drain plugs
- Magnets on bottom of the housing
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What would operating the transmission with a high oil level cause?
- Foaming oil or overheating
- Air boubles would result in lack of lubrication and bearing or gear failure
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What drives the transmission oil pump?
Countershaft PTO gear
Driven whenever the input shaft is turning
401Db
Where is the transmission filter generally located?
a) between cooler and transmission on return line
b) between pump and cooler on outlet line
c) between suction screen and pump
b) between pump and cooler on outlet line
401Db
What weight of oil is used in Eaton transmissions?
SAE 50
401Db
what is a mild hybrid vehicle
a vehicle that assists in the acceleration of take-off of a vehicle
What is a full hybrid vehicle?
- Assists in acceleration on take-off
- Propel the vehicle without any input from the engine durring normal driving
401Db
What is a mild hybrid vehicle?
Assists in acceleration on take-off only
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What are the two types of hybrid architectures?
Series
- Engine never directly drives the drivetrain
Parallel
- Engine, electric motor, or hydraulic motor are all capable of driving drivetrain
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What are the defining traits of a series hybrid drivetrain?
The engine never directly powers the vehicle.
Connected in series with a device that provides the power to propel the vehicle.
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What are the defining traits of a parallel hybrid drivetrain?
The electric motor or hydraulic pump is mounted between engine and transmission.
The engine or the electric or hydraulic motor are all capable of driving the transmission and propelling the vehicle.
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What are the two main functions of a motor/generator?
- Used as a motor to propel the vehicle
- Used as a generator to charge the batteries when regenerative braking
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What are the three main components of a diesel parallel electric hybrid?
- Motor/generator
- Inverter
- Power electronics carrier (PEC)
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What are the main purposes of the inverter in a hybrid vehicle?
- Convert DC to AC for propel mode
- Convert AC to DC during regenerative braking to charge the batteries
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What is the PEC in a hybrid vehicle?
Power Electronic Carrier
- Contains high voltage batteries
- Relay box
- Cooling fan and filter
401Db
What type of batteries are prefered in electric hybrid vehicles due to their low self-discharge rates?
a) nickel–metal hydride (NiMH)
b) lithium-ion (Li-ion)
c) lithium iron phosphate (LiFePO4)
d) nickel–cadmium (NiCd)
b) lithium-ion
401Db
In a diesel electric hybrid, what color are the high voltage cables?
Orange
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What is the minimum time to wait for the accumulators to bleed down after a vehicle shut off?
5 minutes
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When the operator releases the accelerator on a Hydraulic Launch Assist, the hydraulic motor and accumulator assist in slowing down the vehicle.
What can the operator do to bypass this feature and allow the vehice to coast?
Keep the accelerator slightly depressed about 10%
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What is the required buffer zone to establish when working on an electric hybrid vehicle?
1m or 3’
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What are worn on technician’s hands to protect them from high voltage?
- Inner rubber protective gloves
- Outer leather gloves
401Db
A three-speed auxiliary section provides how many usable gears?
12 usable gears
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