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HET3 > 190303c > Flashcards

190303c Flashcards

1
Q

What is another name for the reactionary member in a planetary?

A

Held member or being held.

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2
Q

What is the middle gear in a planetary called?

A

The sun gear.

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3
Q

What is the gear called that is in constant mesh with the sun and the internal gears?

A

Planetary gears or planet pinons.

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4
Q

Planetary gears are mounted, what is the member called the gears are mounted to?

A

Planetary carrier.

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5
Q

What are the two names of the outside gear that is a constant mesh with the planetary pinions?

A

Internal gear or ring gear.

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6
Q

What determines the number of planetary pinons in a gear set?

A

Depends on the load or torque the gearset is required to transmit. The greater the number of pinons, the greater the torque.

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7
Q

What is gear ratio?

A

Refers to the number of revolutions the input gear makes to complete one revolution of the output gear.

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8
Q

What is the formula for gear ratio?

A

Drive

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9
Q

What is an example of a 3 to 1 ratio gear set?

A

Non hunting reduction gear set.

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10
Q

What is an example of 4.25:1 gearset?

A

Partial non-hunting reduction gear set.

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11
Q

What is an example of a 4.11111111:1 gearset?

A

A hunting reduction gear set.

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12
Q

Why are planetary gears used in powershift and automatic transmissions?

A

These are used as a basic means to modify torque and speed from the engine.

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13
Q

In a planetary gear set how do you get 1st speed reduction?

A

Input is the sun gear
Output is the carrier
Held is the internal gear

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14
Q

How do you get a 2nd speed(mild) reduction in a planetary gear set?

A

Input is the internal gear
Output is the carrier
Held(reactionary) sun gear

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15
Q

Explain 1st speed overdrive?

A

Input is the planet carrier
Output is the internal
Sun gear is held

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16
Q

Explain 2nd speed overdrive?

A

Input is the carrier
Output is the sun
Internal gear is held reactionary

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17
Q

In a planetary gear set if the carrier is held you will always get what condition?

A

Reverse

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18
Q

Explain reverse reduction in a planetary?

A

Carrier is held
Sun is the input
Internal gear is the output

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19
Q

How is reverse overdrive is achieved ?

A

Carrier is held reactionary
Internal gear is input
Sun gear is output

20
Q

3 way to get neutral in a planetary?

A

1) no held member
2) no input(drive)
3) sun and internal gear driven in opposite directions at the same TOOTH SPEED

21
Q

Direct drive in a planetary

A

1) locking 2 members together

2) driving 2 members in the same direction at the same rpm

22
Q

A clutch that holds an internal gear to transmission case is also know as?

A

Brake

23
Q

A single planetary gear set must meet what 3 conditions?

A

1) One member must be drive or input
2) one member must be driven or output
3) one member must be reaction(held)

24
Q

What are the two basic design types of powershift and automatic transmissions?

A

Planetary type and countershaft type.

25
Q

A dump truck is an example of a machine used in a cycling type application. (T/F)

A

False

26
Q

A scraper is typically used in a hauling application. (T/F)

A

True

27
Q

What are the two type of clutch discs used in transmission clutch assemblies

A

Clutch discs and clutch plates

28
Q

What is the purpose of the grooves on the face of the friction material?

A

Carry oil to lube the discs when the clutch is disengaged and allow the oil to be squeezed out when clutch is applied

29
Q

How are the transmission clutch packs applied?

A

Hydraulically Actuated piston assemblies

30
Q

Reverse gear in a countershaft transmission is possible through two main components

A

Idler gear on countershaft and reverse clutch activation

31
Q

Gear selection in a countershaft transmission is engaged by

A

Drilled oil passages that hydraulically apply clutch discs

32
Q

Countershaft transmissions are made by combining?

A

Reversing countershafts with countershafts that provide multiple speed ranges through clutch disc operation

33
Q

The function of the transmission in a piece of mobile heavy equipment is to modify
the engine power that propels the machine. The transmission allows the operator to

A

decrease vehicle speed and increase torque under conditions of heavy load. Speed can
be increased and torque decreased when the load is light.

34
Q

Many heavy equipment transmissions provide a place to couple auxiliary components
such as hydraulic pumps. This drive is known as:

A

power takeoff.

35
Q

The major advantage of using powershift or automatic transmissions rather than a
manual transmission is that

A

is that power flow is not interrupted when shifts are made.

36
Q

A powershift differs from an automatic transmission in that shifts are made solely at
the discretion of the operator.
a) true
b) false

A

true

37
Q

The planetary gear set component that meshes with the sun and internal gear is called the planet carrier.

a) true
b) false

A

false

The planet pinions do

38
Q

A gear ratio that is expressed .33:1 means that:

A

the input must be rotated .33 revolutions to produce one output revolution.

39
Q

Which component is being held reactionary when a planetary gear set is producing its
deepest speed reduction?

A

the internal gear

40
Q

. Which component of a single planetary gear set is the input member when the output
member is in overdrive?

A

the carrier

41
Q

Countershaft type powershift and automatic transmissions transmit power by locking
spur gears to a countershaft using a hydraulically applied clutch.
a) true
b) false

A

true

42
Q

How are clutch assemblies applied and released

A

Hydraulically applied

Spring released

43
Q

What are two friction materials used to make clutch discs

A

Sintered bronze

Composite materials

44
Q

Where are clutch plates located

A

Between every pair of clutch discs

45
Q

How are transmission clutch assemblies applied?

A

A pressurized oil flow from the transmission charging pump.

HET3 (35 decks)

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