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gearing tans and torque > powershift and automatic transmission > Flashcards

powershift and automatic transmission Flashcards

1
Q

what are the two types of transmission applications

A

cycling transmissions - hauling transmissions

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2
Q

what are the two classifications of powershift transmissions based on the internal gearing

A

planetary - countershaft type

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3
Q

the function of the transmission is to

A

modify engine power to propel heavy equipment

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4
Q

what can powershift transmissions also provide

A

a place to mount a PTO

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5
Q

what is a major advantage to powershift transmissions over manual transmissions

A

allow speed and directional changes with no interruption in the flow of power that is propelling the machine

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6
Q

how do powershift transmissions and automatic transmissions differ

A

powershift transmissions require speed and directional changes to be made solely at the discretion of the operator

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7
Q

automatic transmissions has the ability to

A

receive information on machine ground speed as well as operator demand for power and automatically makes up or downshifts

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8
Q

machines equipped with powershift transmissions are most often used in what type of application

A

cycling

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9
Q

what is a cycling application

A

a repeated forward and reverse motion

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10
Q

most power shift transmissions will feature

A

the same number of gears in forward as reverse

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11
Q

automatic transmissions are normally used in

A

hauling applications

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12
Q

why is a planetary capable of transmitting the same amount of torque as a larger spur gear set

A

because gear tooth loading is spread among all the contact points in the gear set

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13
Q

in most cases what do the gears in a planetary rotate on

A

needle bearings

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14
Q

the greater the number of the planetary pinion gears in a planetary

A

the greater the amount of torque the planetary is able to transmit

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15
Q

how do you achieve direct drive in a planetary gear set

A

any two members locked together or rotating the same rpm in the same direction

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16
Q

when can you achieve neutral in a planetary gear set

A

when there is an input but no held member or when there is no input

17
Q

how are clutches always released

A

spring

18
Q

when multiple clutches are on a powershift transmission gear set

A

only one clutch at a time per gear set can be applied at any one time

19
Q

a differential planetary set is by definition a simple planetary set with

A

three rotating members and dual inputs with a single output

20
Q

what is the turbine shaft

A

is the output shaft of the torque converter

21
Q

the mainshaft is

A

internal in the transmission and connected to two of the planetary gear sets

22
Q

what are the most commonly used clutch assemblies

A

multiple disc clutch

23
Q

how are multiple disc clutches applied

A

by pressurized oil flow from the transmission - charging pump

24
Q

what are the components of multiple disc clutches

A

clutch discs and clutch plates

25
Q

clutch discs

A

are steel discs that have a friction material bonded to both sides

26
Q

what are the grooves on the friction material that produce ridges called

A

lands

27
Q

what is the purpose of the grooves in a clutch disc

A

to allow oil to lubricate the disc when disengaged and squeeze out when applied

28
Q

clutch discs have teeth cut in the

A

internal circumference

29
Q

the teeth on the clutch disc engage

A

the splines on the component that is to be held

30
Q

clutch plates are located

A

between every pair of clutch discs

31
Q

the plates provide

A

a reaction surface on witch the clutch discs can act on

32
Q

what would a clutch plate have on the outside circumference if it was intended to hold a components of a planetary gear set

A

tangs

33
Q

what would a clutch plate have on the outside circumference if it was intended to hold two rotating components together

A

teeth

34
Q

what is used to apply the clutch

A

hydraulically actuated pistons

35
Q

how is the actuating piston of a clutch held in the piston housing

A

by teeth that are machined into its outer surface

36
Q

what type of seal is used on the clutch actuation piston to ensure good sealing

A

a lip type seal

37
Q

in general the bearings and shafts of a countershaft transmission will have to be

A

larger than the planetary design

gearing tans and torque (9 decks)

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