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4.3 Installation of the motor (when the blower adopts the specification of
V-belt drive main body only)
4.3.1 Assembly
For the names of parts, refer to the disassembling
structure drawing in page 6.
•
Prepare the motor, pulley on the motor side, and
V-belt that are required.
•
Exactly “center” the pulley on the fan side and pulley
on the motor side as shown in the drawing at right.
Operating the blower with them not centered exactly
causes abnormal vibration of bearing and/or
significant reduction in the durability of V-belt, pulley
and bearing.
•
Adjust the tension of the belt as follows: Neglecting
the tension adjustment causes a failure.
When adjusting the tension of the belt, use
adjustment nuts to fix the motor base.
•
Procedure for tensing the belt
Step 1. Span calculation
First calculate the span (
ℓ
) of the V belt.
The span of the V belt is part of the connection
of the V belt with the motor pulley and the fan
pulley.
Step 2. Calculation of deflection
When a deflection load is applied, calculate the
deflection (
δ
) by the formula at right.
Step 3. Measurement of deflection load
Apply a deflection load (P) to the center of the
belt span. When the deflection of
δ
mm is the
value calculated in Step 2, read the value of the
deflection load.
It is convenient to use a tension meter etc., for
measurement of deflection load.
X
Pulley on the
fan side
V belt
X
≒
0
Adjustment nuts
Pulley on the
motor side
ℓ
δ
Ｄ
ｄ
Ｐ
Ｃ
（Ｄ－ｄ）
2
＝
Ｃ
2
－
4
ℓ：
span
(mm)
C
：
distance from shaft
(mm)
D
：
big pulley diameter
(mm)
d
：
small pulley diameter
(mm)
ℓ
Span
δ
＝ ０．０１６
×
ℓ
δ
:
Deflection
(mm)
ℓ
: Span (mm)
Deflection
