BOCK FK40 Series - V-Belt Drive; Main Bearing Load

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4| Compressor assembly
 Duringoperationwith capacitycontrollers (Accessories, Chap. 7), thechanging loadcan cause
increased running noises and belt drive vibrations.
4.3 V-belt drive
4.4 Main bearing load
4.5 Electromagnetic clutch assembly
The following description applies for an electromagnetic clutch secured to a shaft.
Toabsorbthemagneticeldoftheelectromagneticclutch,thefrontbearingangehasa
snugtØ148h8(seeFig.8).
Toconnectthemagneticeld,loosenthe4cheeseheadscrewsM8onthebearingange
(seeFig.8).
Slidethemagneticeldtoasnugtandre-attachusingthefourcheeseheadscrewsM8
(Fig.9).Screwtorque=37Nm.
Further assembly of the electromagnetic clutch according to the clutch manufacturer.
To prevent the belt drive overloading the compressor main bearing,
ensure that:
The force applied at the force engagement force by the belt
tension(seeFig.7)mustnotexceedF
max
= 2750 N.
If the force engagement point shifts forwards (see Fig.11, small
point),theforceF
max
reduces as per the following formula:
F
max
=
245 kNmm
(90 mm + L
1
[mm])
F
max
=
2750 N
M
bmax
=
245kNmm
L
1
(mm)
Fig. 7
ATTENTION Inappropriately designed belt drives, especially belt knocking
or excessive tensioning forces can cause compressor damage!
Make sure that the drive belt is designed correctly, e.g. by using
tensionersandselectingthebeltproleandthebeltlength.
Fig. 8
Bearingange,front
Magneticeld
Fig. 9
148 h8