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Power and transmission > Belt Drives > Flashcards

Belt Drives Flashcards

1
Q

Identify three factors which determine the potential grip of a v belt

A

Area of contact
Belt tension
Fiction between velt and pulley

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2
Q

Belt width and the arc of contact determine

A

Belts area of contact

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3
Q

Identify three methods used to increase the arc of contact

A

Crossed belt
Moving input and output shafts farther apart
Using an idler or snub pulley

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4
Q

Belt idlers put an additional bending stress on the belt which reduces belt life to or f

A

True

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5
Q

The best tension for a v belt is the —– at which the belts will not slip under full load.

A

Lowest tension

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6
Q

Bearing life is —— when belts are over tightened

A

Shortened

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7
Q

Friction between two surfaces

A

Is not influenced by the area of surface

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8
Q

The wedging effect of v belts results in

A

Lower velt take up tension required

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9
Q

Industry standards for v belts

A

Control sheave groove details for v belts

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10
Q

Which component of a typical v belt receives the tension or pull

A

Tensile member

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11
Q

Which type of v belt length system is most only used by belt manufacturers

A

Exact length

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12
Q

Conventional v belts are identified as to cross section sizes

A

A b c d e

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13
Q

Which type of v belt had a narrow cross section but sits deeper in the sheave groove?

A

High capacity v belts

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14
Q

What is the top width of a 8 v v belt

A

1 inch

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15
Q

Not he’s v belts have a —— horsepower rating than conventional c belts

A

Higher

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16
Q

The notches in a notched v belt

A

Reduce bending stresses
Help to dissipate heat
Provide more uniform distribution of load

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17
Q

Serpentine drives usually use why type of v belt

A

Double v belt

18
Q

To solve the problem of continually rolling or jumping v belts it is recommended to

A

Use power band v belts

19
Q

Which belts are generally used where power transmission is less than one horsepower

A

2l 3l 4l 5l v belts

20
Q

Are poly v belts as flexible as flat belts

A

Yes

21
Q

Poly v belts have —– area of belt sheave contact than eithe flat, standard or high capacity v belts

A

Greater

22
Q

What best gives the variable speed belt it’s flexibility over small sheave diameters

A

Inner cog construction

23
Q

What variable speed drive has a fixed shaft center distance

A

Dual variable sheave drive

24
Q

On dual variable sheave drives , the ratio of maximum driver pitch diameter to the minimum driven pitch diatmeter develops —– drive output speed

A

Maximum

25
Q

If the driver and driven sheaves of a variable speed are check and found to be the same width, a straightedge can be used

A

Without having to consider offset allowance

26
Q

Allowing a variable speed belt to bottom on the sheave is correct

A

No

27
Q

Which type of belt is used where slippage is not tolerated

A

Timing belt

28
Q

Positive drive belts have the same positive engagement as two other power tranission drive systems , these are

A

Chain

Gear

29
Q

Belt code 185 h 050

A

Pitch length 18.5 inches
Pitch h
Width 1/2 inch

30
Q

Pulley code 18 h 050

A

Number of grooves 18
Pitch h
Width 1/2

31
Q

Linked v belts

A

Are used in conventional v belt sheave grooves
Are used where it is difficult to install an endless v belt
Are held together with metal studs

32
Q

What are two disadvantages of using flat belts

A

High belt tension

Failure to track properly

33
Q

The difference between the diameter of a flat belt pulley at its center and at it’s edge is called

A

Pulley crown

34
Q

Excess crowning

A

Increases the tension at the center of the belt

Causes premature belt failure

35
Q

Identify two methods used to join flat belts

A

Vulcanizing

Mechanical fasteners

36
Q

A sheave groove gage is used to

A

Check cleave size
Find groove wear
Determine groove angle

37
Q

A straightedge touching the driver and driven sheave at —— indicates good sheave alignment

A

Four points

38
Q

Taper lock bushings are used to

A

Located a sheave anywhere on a cylindrical shaft

39
Q

Which belts require the greatest amount of slack off and take up movement

A

Conventional v belts

40
Q

To remove v belts from a sheave it is best to pry them off while the sheave is rotated slowly t or f

A

False

41
Q

What usually causes the v belts cross section to swell up

A

Oil or grease on the belt

42
Q

Belt drives for power transmission are classed as

A

Frictional drives

Power and transmission (1 decks)

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