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4th year HET > Transmission fundamentals part B > Flashcards

Transmission fundamentals part B Flashcards

1
Q

the auxiliary section of a transmission can be a

A

two speed - three speed and four speed arrangement

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2
Q

how is the auxiliary section generally shifted

A

with air, eliminating the need for a secondary shift lever and mechanical linkage

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3
Q

what type of gearing can the auxiliary section have

A

range, splitter or deep reduction

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4
Q

what type of gearing typically accounts for a large ratio change

A

range gearing

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5
Q

what type of gearing will account for a small ratio change

A

splitter gearing

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6
Q

what type of gearing will account for a lower starting gear than otherwise allowed

A

deep reduction

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7
Q

what style of gearing in the auxiliary section will use a synchronizer to aid in the shift process

A

range shift

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8
Q

how is torque provided to the auxiliary section

A

by the mainshaft of the main section

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9
Q

how dose the auxiliary drive gear receive torque

A

from the main section and the manshaft

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10
Q

how is the auxiliary drive gear mounted on the mainshaft

A

mounted on the part of the mainshaft that extends into the auxiliary housing and it may be directly splined to the mainshaft or may be floating between the two auxiliary countershafts

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11
Q

where do the auxiliary countershafts receive torque from

A

from the auxiliary drive gear and then deliver that torque to the selected output shaft gear

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12
Q

how is auxiliary torque calculated

A

auxiliary torque = engine torque in the main section x gear ratio

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13
Q

how are synchronizers utilized in the auxiliary section of the transmission

A

use to match the speed of the gear being engaged with the output shaft

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14
Q

where is the synchronizer most often used in the auxiliary section of the transmission

A

mounted on the output shaft between the low and high range gears

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15
Q

what is the main purpose of the output shaft

A

to deliver torque to the driveline

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16
Q

how is the output shaft held in position

A

by two tapered roller bearings in the rear bearing housing

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17
Q

if a mechanical speedometer is used

A

a speedometer drive gear is also positioned on the output shaft

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18
Q

if a electronic speedometer system is used the transmission output shaft will have

A

one or more magnetic pick-ups positioned closely to a tooth ring ( tone ring or tone wheel )

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19
Q

what type of lubrication is most common on transmission

A

splash type

20
Q

what is a method used to direct oil to critical areas of the transmission

A

galleries cast in the housing

21
Q

other than galleries what is another method of directing oil to critical areas of the transmission

A

bolt on troughs

22
Q

how Is the oil in a splash oil type transmission filtered

A

with magnetic drain plugs located in the bottom of the transmission case

23
Q

what would operating the transmission with a high oil level cause

A

failure from foaming the oil or overheating . air bubbles trapped in the oil reduces lubrication qualities

24
Q

what is a mild hybrid vehicle

A

a vehicle that assists in the acceleration of take-off of a vehicle

25
Q

what is a full hybrid vehicle

A

provides acceleration on take off and can also have the ability to propel the vehicle without any input from the vehicle

26
Q

what are the two types of hybrid architectures

A

series and parallel

27
Q

series hybrids

A

the engine never directly powers the vehicle . the engine is connected in series with a device that provides the power to propel the vehicle

28
Q

parallel hybrids

A

the electric motor or hydraulic pump is sandwiched between engine and transmission , the engine or the electric or hydraulic motor are both capable of driving the transmission and propelling the vehicle

29
Q

what are the two functions of a motor/generator

A

used as a motor when used to propel the vehicle

used as a generator to charge the high voltage batteries during deceleration

30
Q

what are the three main components of a diesel parallel electric hybrid

A

motor/generator
inverter
power electronics carrier

31
Q

what is the purpose of the inverter

A

to convert dc volts to ac for propel and converts ac volts to dc during regenerative braking to charge the batteries

32
Q

what are the three different methods a electric diesel can be propelled

A

electric only
diesel electric
diesel only

33
Q

when would electric only mode most beneficial

A

in city stop and go traffic where low to moderate acceleration is required

34
Q

diesel electric mode ( parallel mode )

A

when both the motor/generator and diesel engine provide torque to the drive axles . the electric assist that the motor provides lowers the duty cycle on the diesel engine during acceleration

35
Q

diesel only mode

A

only the diesel engine powers the vehicle . the generator still turns but does not produce any electricity to charge the batteries and is also not a parasitic drain on the engine

36
Q

when are the batteries charged in a hybrid vehicle

A

during braking or coasting

37
Q

how dose a diesel hydraulic parallel hybrid provide assist in acceleration

A

uses transfer case - hydraulic pump - accumulators and reservoir

38
Q

when will the transfer case engage

A

only when the engine is running, the vehicle is in drive, the vehicle is stopped and no faults are present

39
Q

to obtain maximum life from the transfer case

A

ensure the driveline angles are correct and it contains the correct quality and quantity of oil

40
Q

when will regenerative braking automatically shut off

A

when the accumulator is fully charged, a system fault occurs, an abs event is triggered,

41
Q

the purpose of the range, splitter and deep reduction cylinders is to

A

use air signal to shift the auxiliary section sliding clutches

42
Q

the two speed auxiliary section provides

A

reduction and direct drive

43
Q

the three-speed auxiliary section provides how many usable gears

A

12

44
Q

which position provides direct drive in the four-speed auxiliary section

A

high range high splitter

45
Q

when a spin on filter is used on a transmission lubrication system, the filter is located between the oil cooler and the .

A

pump outlet port

46
Q

in a diesel electric hybrid what color are the high voltage cables

A

orange

47
Q

what is the minimum time to wait for the accumulators to bleed down after vehicle shut off

A

5 min

4th year HET (31 decks)

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