Belts 1 Flashcards
The 3 main categories of belts are?
V or wedge
Flat
Synchronous or toothed
The driving pulley on a v belt system is called a what?
Sheave
Tooth style belts use this style of pulley?
Sprocket
Flat belt uses this type of pulley
Drum-style pulley
Advantages of belts
Economical to maintain
They are simple to design
They are easy to install
No lubrication required
They lend themselves to a wide variety of applications
They can adjusted to almost any speed
Pulleys are less expensive than chain sprockets
Belts can act like a fuse or clutch by failing before the machine does
Less overhung weight
What kind of belt can be put around corners due to their flexibility?
Flat belts
What is a disadvantage of a flat belt?
It relies on high tension in order to keep firm contact with the pulley to keep from slipping
Pulleys have crowns or flanges often times for flat belts because?
They belt could go off center or walk off the pulley.
V belts are generally found in 2 broad categories which are?
Envelope, Raw edge
B90 would tell me what about a belt?
Classical V
B=5/8
90 inch inside length
5V500 tells me what?
It’s a 5/8 wedge belt
The nominal outside length of 50 inches
3VX950 is what type of belt?
3/8 top width wedge V belt with cogs
95 inch nominal outside length.
3L400 is what type of belt?
It’s a 3/8s top width and 40 inch nominal outside length and its fractional horsepower
3L400 is what type of belt?
It’s a 3/8s top width and 40 inch nominal outside length and its fractional horsepower
Banded belts are?
V belts that have been joined together by a top band
V ribbed belts
Basically a flat belt with ribs running longitudinally around the surface of the belt.
Synchronous belts are also known as
Timing belts
A belt that does not require friction but requires positive engagement of belt teeth with complimentary teeth on a sprocket
Timing belts
Top widths
A=1/2”
B=5/8”
C=7/8
D=1-1/4
Parts of the belt
Backing fabric
Tensile cord
Insulation rubber
Cushion rubber
