powershift and automatic transmission

Question 1

what are the two types of transmission applications

Answer 1

cycling transmissions - hauling transmissions

Question 2

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

Answer 2

planetary - countershaft type

Question 3

the function of the transmission is to

Answer 3

modify engine power to propel heavy equipment

Question 4

what can powershift transmissions also provide

Answer 4

a place to mount a PTO

Question 5

what is a major advantage to powershift transmissions over manual transmissions

Answer 5

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

Question 6

how do powershift transmissions and automatic transmissions differ

Answer 6

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

Question 7

automatic transmissions has the ability to

Answer 7

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

Question 8

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

Answer 8

cycling

Question 9

what is a cycling application

Answer 9

a repeated forward and reverse motion

Question 10

most power shift transmissions will feature

Answer 10

the same number of gears in forward as reverse

Question 11

automatic transmissions are normally used in

Answer 11

hauling applications

Question 12

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

Answer 12

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

Question 13

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

Answer 13

needle bearings

Question 14

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

Answer 14

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

Question 15

how do you achieve direct drive in a planetary gear set

Answer 15

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

Question 16

when can you achieve neutral in a planetary gear set

Answer 16

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

Question 17

how are clutches always released

Answer 17

spring

Question 18

when multiple clutches are on a powershift transmission gear set

Answer 18

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

Question 19

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

Answer 19

three rotating members and dual inputs with a single output

Question 20

what is the turbine shaft

Answer 20

is the output shaft of the torque converter

Question 21

the mainshaft is

Answer 21

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

Question 22

what are the most commonly used clutch assemblies

Answer 22

multiple disc clutch

Question 23

how are multiple disc clutches applied

Answer 23

by pressurized oil flow from the transmission - charging pump

Question 24

what are the components of multiple disc clutches

Answer 24

clutch discs and clutch plates

Question 25

clutch discs

Answer 25

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

Question 26

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

Answer 26

lands

Question 27

what is the purpose of the grooves in a clutch disc

Answer 27

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

Question 28

clutch discs have teeth cut in the

Answer 28

internal circumference

Question 29

the teeth on the clutch disc engage

Answer 29

the splines on the component that is to be held

Question 30

clutch plates are located

Answer 30

between every pair of clutch discs

Question 31

the plates provide

Answer 31

a reaction surface on witch the clutch discs can act on

Question 32

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

Answer 32

tangs

Question 33

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

Answer 33

teeth

Question 34

what is used to apply the clutch

Answer 34

hydraulically actuated pistons

Question 35

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

Answer 35

by teeth that are machined into its outer surface

Question 36

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

Answer 36

a lip type seal

Question 37

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

Answer 37

larger than the planetary design