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gearing tans and torque > torque converter > Flashcards

torque converter Flashcards

1
Q

what is the purpose of the split guide ring

A

is to prevent turbulence within the unit while it is in operation

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2
Q

scavenging pumps are used where

A

the housing and the transmission are on the same plane

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3
Q

rotary flow is also called

A

coupling phase

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4
Q

since the engine block and torque converter housing are structurally strong the engine mount design reduces the need to

A

check proper torque converter/engine alignment

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5
Q

when is torque multiplication achieved in a torque converter

A

whenever the impeller rotates faster than the turbine and the stator is stopped

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6
Q

fixed stators are

A

fixed in place does not rotate - usually splined to a sleeve - can never achieve rotary flow - single phase

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7
Q

what are the three types of variable capacity torque converters

A

multiple impellers - multiple turbine - variable pitch

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8
Q

what is a variable capacity torque converter

A

a unit that can increase or decrease the torque capacity within its own ratio range

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9
Q

cooler relief circuit

A

always connected to the converter outlet - removes heat and contamination

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10
Q

what are the functions of a torque divider

A

provide automatic clutching - multiply engine torque in accordance with output shaft load - absorb power train shock loads

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11
Q

what is another name of the impeller or pump on a torque converter

A

the pump element

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12
Q

rotary flow will create

A

low heat - high speed - low torque

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13
Q

when is the maximum ratio change in a torque converter achieved

A

at a stall condition

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14
Q

in a torque divider the internal gear is also connected to the

A

turbine

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15
Q

what is the converter phase

A

turbine is rotating slower than the impeller ( vortex flow )

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16
Q

what is another name for a impeller

A

a pump

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17
Q

what are the scavenging methods

A

gravity drain - scavenging pump -

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18
Q

what are the two types of stators

A

fixed and freewheeling

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19
Q

what component on a torque converter changes the kinetic energy of the fluid in motion to mechanical energy on the drive line or transmission

A

the turbine

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20
Q

when is the minimum ratio accomplished in a torque converter

A

when they achieve a 1:1 drive

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21
Q

how many phases or there in a torque converter

A

three

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22
Q

what is the reaction member of a torque converter

A

the stator

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23
Q

what are the two types of converter housings

A

wet and dry

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24
Q

where does the impeller receive torque from

A

the engine fly wheel

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25
Q

what is the arrangement called when the torque converter is not coupled to the engine flywheel

A

remote torque converter

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26
Q

gravity drains are used where

A

the torque converter housing is located above the transmission

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27
Q

never condemn a component based on the results of

A

a single test

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28
Q

when both impellers are locked together on a variable capacity multi impeller

A

high torque is created

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29
Q

how is volume controlled on a torque converter

A

physical size of the impeller - vane size and number of vanes and structure

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30
Q

in addition to engine mount design what also can accommodate slight differences in misalignment

A

rubber block tooth construction

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31
Q

what is a stage

A

the number of times oil is redirected before it returns to the impeller

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32
Q

when does the impeller of a torque converter start to move

A

whenever the flywheel of the engine is moving

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33
Q

what is a torque converter

A

it is a type of fluid coupling device with the addition of a third element the stator

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34
Q

lock up clutch

A

mechanically connects the turbine and impeller and eliminates the small amount of slippage for 1:1 drive

35
Q

why are the vanes in the impeller angled

A

to increase force and accuracy of the fluid flow onto the vanes of the turbine element

36
Q

how is velocity controlled in a torque converter

A

physical size of the torque converter - actual size of the vanes and angle of the vanes - speed of the impeller

37
Q

what must you check after torque converter installation

A

crankshaft end play

38
Q

in cold weather regardless of oil used - the transmission must always be

A

placed in neutral with the machine park brake applied before engine start up

39
Q

what are the elements of a torque converter

A

the impeller - turbine and the stator

40
Q

what are the disadvantages of fluid couplers

A

efficiency is lost due to slippage - heat generation - cannot increase or multiply torque

41
Q

the converter pressure regulating valve

A

maintains working pressure within the converter - prevents cavitation and aeration - usually found on the converter outlet

42
Q

how are multiple turbines connected in a variable capacity torque

A

by a overrunning clutch

43
Q

stall tests are conducted with the transmission in

A

the highest gear

44
Q

in a torque divider the flywheel is connected to the

A

sun gear and the impeller

45
Q

when light work is required out of a multiple turbine converter

A

only one turbine is doing work

46
Q

oil in a torque converter must be

A

reasonably light

47
Q

what can cause overheating of a torque converter

A

plugged oil cooler - charge pump faulty - low oil level - high oil level

48
Q

the exact amount of torque multiplication of a stator depends on

A

the angle of the vanes in the elements

49
Q

what drives the torque converter output shaft

A

the turbine

50
Q

what is a critical concern that must be considered when remote mount is used

A

proper drive line alignment between the engine and torque converter

51
Q

the converter relief valve

A

protects the converter from excessive pressure due to cold weather plugged filter or restriction - can also be used as the main pressure control for the transmission

52
Q

what are the three V’s in torque converter energy transfer

A

Velocity - Volume - Viscosity

53
Q

when light work is required on a multi impeller

A

one impeller is released

54
Q

what is the lock up phase

A

when the turbine and the impeller are locked together by a mechanical means

55
Q

what can cause a low stall speed during a T/S test

A

a slipping stator or over running clutch

56
Q

what is a torque divider

A

when a single stage torque converter and a planetary gear set are used to transmit power

57
Q

in a torque divider the carrier ( planetary gear set ) is also connected to the

A

output shaft

58
Q

what is the stator designed to do

A

change the direction of oil flow so that is assists in torque multiplication

59
Q

when a torque converter has multiple impellers

A

one is attached to the flywheel and constantly driven - the other is freewheeling and controlled by a valve or electrical switch controlling a piston that locks it to the first impeller

60
Q

what are the two types of oil flow in a torque converter during operation

A

rotary and vortex

61
Q

in a high speed stall if the engine speed is higher than specifications

A

the torque converter might not be multiplying torque as required or the forward clutch in the transmission may be slipping

62
Q

what is a stage

A

refers to the number of times oil strikes the turbine before it returns to the impeller ( normally classed as the number of turbines )

63
Q

when is minimum torque created in a variable pitch stator

A

closed position

64
Q

what principal do torque converters operate under

A

hydrodynamics

65
Q

dry housing

A

do not have a PTO or any gearing - are sealed so no oil leaks into housing

66
Q

what will happen during the stall condition

A

maximum torque multiplication and heat generation

67
Q

freewheeling stators

A

have an overrunning clutch - turns freely with turbine rotation at coupling phase - stationary at the coupling phase - able to achieve rotary flow - used in a two phased torque converter

68
Q

the charge pump for the torque converter

A

provides oil flow for the torque converter and transmission - is driven by the impeller or directly off the fly wheel

69
Q

what is a phase

A

the relationship of the impeller and turbine relative to energy transfer

70
Q

what is the coupling phase

A

turbine is rotating aprox the same speed as the impeller ( rotary flow )

71
Q

what are the three phases

A

converter - coupling - lockup

72
Q

wet housings

A

used to lubricate a gear train within the housing can have a PTO

73
Q

vortex flow will create

A

high heat - low speed - high torque

74
Q

when is maximum torque created in a variable pitch stator

A

open position

75
Q

what is another name for vortex flow

A

converter phase

76
Q

whenever the turbine is running at low speeds what type of slow is generated

A

vortex

77
Q

when you are conducting specific tests on a torque converter in the stall condition

A

never allow the torque converter to remain in this condition for longer then absolutely necessary due to heat generation

78
Q

what can help you isolate the problem when running tests

A

monitoring the heat of individual components at the same time

79
Q

what are the two possible locations for a torque converter to be mounted

A

remote mount or engine mount

80
Q

never conduct a stall test in

A

low gear - driveline/transmission damage can occur

81
Q

when would there be the most slippage in a torque converter

A

at low speeds

82
Q

whenever the turbine and impeller are rotating at the same speed

A

rotary flow is created

83
Q

what is another name for engine mount torque converters

A

integral design

84
Q

what are some advantages of a torque converter

A

no mechanical connection - shock absorption - gradual start up

gearing tans and torque (9 decks)

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