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Belt Tracking

Pulley Crowns

Crowning one or several pulleys in a belt system is the most common way oftracking a belt. For flat power transmission belts and narrow conveyor belts

(200mm wide), a radius crown is used. For wider conveyor belts, typically, atrapeoidal crown is applied. !ote" !ever utilie an ape# crown$

Radius Crown Specifcations or Flat Belt Pulleys

% radius crown represents a great wayto track a belt. &imensionally, it does

not take a big crown height in order forthe belt to track properly, and

e#ceeding the seemingly smallamounts below will actually do more

harm than good$ 

'n a system with multiple pulleys,

crown the pulleys that turn the sameway.

 

Standard Radius Crown Height hPulley Face

Width Wp

Pulley Diameter D25-15 15-

!

!-" "-

1

1-

15

#15

mm mm mm mm mm mm mm

25-125 0. .2 .* .+ 2.0 2.

125-25 .0 .* . 2.0 2.* 2.

25-$ . .- .+ 2.2 2. *.0

#$ .2 . 2.0 2. *.0 *.

he min. pulley face width /p  (belt width /b # .) 1 mm.

he ma#. belt width /b  (pulley face width /p  mm) 3 .0

http://www.visusa.com/glossary.htm#apexhttp://www.visusa.com/glossary.htm#apex

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Trapezoidal Crown Specifcations or Conveyor Pulleys

Pulley Diameter D Crown Height hmm mm

25 to " 0.*

" to 1 0.-*

1 to 15 0.4

15 to 2 0..44

2 to 2% 0.4

2% to !5 .04#!5 .-

  &ote' he cylindrical part of the pulley /c is half of the belt width /b.

%lso, it is recommended for the pulley width /p to be appro#imately0 to 205 wider than the belt width /b for the pulley crown to

function properly. For pulley widths less than 200mm, use a radiuscrown and refer to the flat belt pulley specifications above.