V-Belt Drive; Main Bearing Load; Electromagnetic Clutch Assembly - Danfoss BOCK FK20 Operating Manual

4| Compressor assembly

4.3 V-belt drive

4.4 Main bearing load

To prevent the belt drive overloading the compressor main bearing,
ensure that:
The engagement force applied by the belt tension (see Fig. 5)
must not exceed F
If the force engagement point shifts to the right (see Fig. 5,
small point), the force F
formula:
=
F
(50 mm + L
max per.
D
GB

4.5 Electromagnetic clutch assembly

F
The following description applies for an electromagnetic clutch secured to a shaft.
I
To absorb the magnetic field of the electromagnetic clutch, the sliding ring lid has
TR
a snug fit Ø 38 h8 (see Fig. 6).
To connect the magnetic field, remove the marked Allen head screws of the sliding ring lid
(see Fig. 7).
Slide the magnetic field to a snug-fit and fasten using the three M5 x 20 cheese head
screws provided (Fig. 7). Screw torque = 9 Nm.
Further assembly of the electromagnetic clutch according to the clutch manufacturer.
Fig. 6
Snug fit
10 | AQ451838788471en-000201
ATTENTION! Inappropriately designed belt drives, especially belt knocking
(offsets, inclinations) 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 profile and the belt length.
= 600 N.
max per.
reduces as per the following
max per.
30 kNmm
[mm])
1
Sliding ring lid
Magnetic field
Fig. 7
© Danfoss | Climate Solutions | 2023.07
F 600 N
max =
M 30kNmm
bmax =
Fig. 5