Gearing princibles Flashcards

1
Q

what are the key areas of the gear tooth

A

Face - flank - heel - toe - centerline - pitch line

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2
Q

once a gear tooth has been divided lengthwise, what is the name of the upper half of the tooth

A

face

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3
Q

once a gear tooth has been divided lengthwise, what is the name of the lower half of the tooth

A

flank

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4
Q

when a gear tooth has a larger end and a smaller end what is the smaller end of the tooth called

A

toe

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5
Q

when a gear tooth has a larger end and a smaller end what is the larger end of the tooth called

A

heel

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6
Q

why is the root fillet of a gear tooth rounded slightly

A

to give the tooth strength and reduce the chances of cracking in this area

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7
Q

when the engine is driving a tractor the driving force acting on the gears in mesh is happening on what side of the gear tooth

A

drive side of the gear tooth

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8
Q

when the throttle has been let off and a tractor is coasting down a highway . with the loaded vehicle pushing the powertrain what side of the gear teeth are being used

A

the coast side

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9
Q

what are the three dimensions when looking at a pitch circle of a gear

A

. root diameter = shortest measurement
. outside diameter = greatest measurement
. pitch diameter = starts at the line that divides face and flank

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10
Q

in order to determine circular gear pitch what must first be established

A

pitch circle

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11
Q

why is it important to have the pitch circles of gears in mesh intersect

A

this relationship provides great gear strength, maximum force can then be delivered through the gears

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12
Q

wat is the purpose of having clearance between the root and tip of gear teeth in mesh

A

helps maintain a lubrication film between the teeth as they mesh together

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13
Q

what is the purpose of gear backlash

A

to allow for tooth expansion and lubrication

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14
Q

what is the purpose of having timed gear sets

A

this ensures that they always operate in a specific relationship with one another

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15
Q

what will proper timing of gears promote

A

long service life because they will develop distinctive wear patterns during operation

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16
Q

non - hunting gear sets

A

will have to be timed - will have a whole ratio 3:1 - 2:1 ect

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17
Q

partial - nonhunting gear sets

A

will have to be timed - will have a ratio without a run on number 4.50:1 - 3.75:1 ect

18
Q

hunting gear sets

A

will not have to be timed . number of teeth will divide unequally into the crown gear 3.89: 1 - 2.333333:1 ect

19
Q

direct drive

A

when two gear of identical size are in mesh with each other will have a one to one ratio 1:1

20
Q

how is a gear ratio calculated

A

number of driven teeth over number of drive teeth

21
Q

how is a reduction created in a gear set

A

small gear driving a big gear

22
Q

how would a overdrive be created in a gear set

A

large gear driving a big gear

23
Q

how can you change rotation of gears on mesh

A

by adding an idler gear

24
Q

what is the most basic type of gears

A

straight spur cut gears

25
do straight cut spur gears require thrust washers
no because no end thrust is created
26
what is an advantage of internal gear design
very strong and they can handle high loads
27
what is an advantage of helical cut gears
provides great strength and less noise in operation
28
because of the design of helical cut gears what do they need to have
thrust washers because axial thrust is created when they are in mesh
29
what is a herringbone type of gear
a double helical cut gear . used for heavy torque loads
30
what type of gear set can be used to change rotary motion into linear motion
rack and pinion
31
in order to gain strength in design of angle cut gear sets what type of gear was developed
spiral cut gears . allows the contact to be more extensive and noise to be reduced
32
when would a hypoid gear configuration be used
where high torque loads are expected
33
when would a amboid gear configuration be used
when the vehicle is operating off road and this will allow for a higher drive line position
34
what is the difference between hypoid and amboid gear sets
. Hypoid gear sets are positioned so the centerline of the pinion shaft is below the centerline of the crown gear . Amboid gear sets are positioned so the centerline of the pinon shaft is above the centerline of the crown gear
35
what are the components of a simple planetary
sun gear - pinion gears ( planets ) and internal gear
36
how is direct drive achieved in a planetary
any two members held
37
how is reverse achieved in a planetary
carrier held or planets
38
how is reduction achieved in a planetary
carrier driven
39
how is overdrive achieved in a planetary
carrier drive
40
how is neutral achieved in a planetary
no members held