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Mechanics Personal > Belts 1 > Flashcards

Belts 1 Flashcards

1
Q

Main advantage of belt drives?

A

Belt will act as a clutch and slip or fail before the equipment does.

Also cost less than chain drives

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2
Q

What are the three main types of belts?

A

V or wedge belt

Flat belt

Toothed / synchronous / timing

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3
Q

What is the component being turned by the belt refers to as?

A

Pulley

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4
Q

The v style belt uses what type of pulley?

A

Sheave

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5
Q

The toothed style belt uses what type of pulley?

A

Sprocket

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6
Q

The flat style belt uses what style pulley?

A

Drum style pulley.

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7
Q

Advantages of belt drives over close coupled, roller chain, and gear drives?

A

They are relatively economical to install and maintain

They are simple to design

They are easy to install

No lubrication is required

Wide variety of applications

Can adjust for any speed requirements

V belt drives are quiet and operate smoothly

Pulleys are less expensive then comparable chain sprockets

Long sheave / pull life

Belts act as a clutch to prevent machine failure

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8
Q

Advantage of flat belts?

A

They have flexibility and can go around corners

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9
Q

Disadvantage of flat belts?

A

Relies on high tension to keep belt in contact with pulley and high friction to keep it from slipping

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10
Q

Why must pulleys be crowned and often have flanges?

A

To keep belt centered and keep it from walking off.

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11
Q

Will smaller or larger sheave wear out faster?

A

Smaller

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12
Q

Is the slack side or tight side opposite of rotation?

A

Slack side

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13
Q

What are the two construction categories of v belts?

A

Envelope and raw edge

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14
Q

How do you know it’s envelope style v belt?

A

Tensile cord is not showing. And is protected from from elements. (Used outside)

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15
Q

How to you know it’s raw edge style v belt?

A

Tensile cord is showing. Not protected

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16
Q

How do you know if a belt is sitting right in sheave.

A

Belt sits just above flush

17
Q

What are the parts of the v belt (bottom to top)

A

1) cushion rubber (bottom)
2) tensile cord ( adds strength )
3) insulation rubber (protects cord)
4) backing fabric (top)

18
Q

What do cogs on a v belt do for us?

A

Impart more flexibility when used with small diameter pulleys.

19
Q

Load range of classic v belts?

A

Less than 1 to 500 HP

20
Q

Classic v belts contribute to what?

A

Higher overhung bearing loads and are less efficient to narrow v belt systems

21
Q

T of F v belts have a high tolerance for poor operating conditions and unusual drive conditions l.

A

True

22
Q

Advantage of narrow v belts over classic v belts?

A

More support, transmits more power, slips less, more support to the center of the belt, greater contact surface with sheave

23
Q

What is a Fractional horsepower v belt designed for?

A

Operate drives of less than 1 horsepower

24
Q

The L in belt identification stands for what?

A

Fractional horsepower v belt

25
Q

Are fractional horsepower belts and classic v belts interchangeable?

A

Yes but not recommended

26
Q

Advantage of banded belts?

A

Has backing material across several single belts used to protect belts from whipping or turning over in the sheave. Roll over tendency is vertically eliminated

27
Q

V ribbed belts are what?

A

A flat belt with corrugated ridges running longitudinally around the inside surface of the belt.

This makes it easier to keep on pully or easier to steer

28
Q

Timing belts or synchronous belts are what?

A

Belts that resemble flat belts with evenly spaced raised teeth that are perpendicular to the long axis of the belt.

29
Q

Timing belts rely on what to transmit torque?

A

Positive engagement of belt teeth with complimentary teeth of sprocket

30
Q

B90

A

5/8 “ top width
Classic v belt
90 “ inside length

31
Q

5v500

A

5= 5/8” top width

V= wedge or narrow v belt

50=50”

0= outside length

32
Q

6vx350

A

3/4” top width

Wedge or narrow v belt

X = cogged

35” outside length

33
Q

2LX500

A

1/4” top width

L= fractional horse power

Cogged

50” outside length

34
Q

4/5VX500

A

4 bands

5/8”

Wedge or narrow

50 outside length

35
Q

X in belt identification stands for

A

Belt is Cogged

36
Q

V in belt identification stands for?

A

Wedge v belt

37
Q

If letter is before number in belt identification it means what?

A

Classic v belt and inside length
A = 1/2”
B= 5/8”
C= 7/8”
D= 1 1/4”

Mechanics Personal (13 decks)

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