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UTD.123.2019-10.00_EN
9 - Motor assembly and disassembly
9.1 - General
Attention. Verify that motor:
– respects the application limits (P
1max
,
n
1max
,
etc.) stated on nameplate of gear reducer on which it is
mounted
(gearmotor without motor),
– it has ATEX protection specifications equal to or higher than the gear reducer ones on which it is
mounted
(gearmotor without motor)
– it is complying with the minimum safety requirements of the use area
(see table 7.1).
As all gearmotors are fitted with
standardized
motor, the mounting or replacement of motor is user-
friendly. Simply observe the following instructions (after having observed the safety instructions relevant
to machine, see maintenance procedure of ch. 13.1:
– be sure that the matin surfaces are machined under accuracy rating (IEC 60072-1);
– clean surfaces to be fitted, thoroughly. If painted, remove paint;
– in the event of a lowered keyway, replace the motor key with the one supplied with the gear reducer; if
necessary, check the key so that between its top and the bottom of the hole keyway there is a backlash of
0,1 0,2 mm; iin case of output shaft keyway, lock the key by pins;
– check that motor centering is in the relevant gear reducer flange seat;
– check that the length of the fastening screws from motor to flange is enough to have 2
×
pitch over the
nut;
– consider the tightening torque stated at ch. 7.4:
9.2 - Gearmotors with motor keyed onto hollow high speed shaft of gear reducer
Worm gearmotors MR V
(A series)
Helical gearmotors MR 2I, MR 3I sizes 40 ... 360
(G series)
Bevel gearmotors MR CI, MR C2I
(G series)
– check that the fit-tolerance (push-fit) between hole and shaft end is G7/j6 for D
<
28 mm, F7/k6 for D
38 mm;
– apply a thread-braking seal type LOXEAL 23-18 the coupling surfaces to prevent contact oxydation;
– push the motor up to shoulder;
do not force the motor shaft inside the gear reducer: danger of severe
injury;
– tighten the motor fastening screws or nuts to gear reducer motor flange;
In presence of hub clamp (helical gearmotors 2I, 3I with motor size
200) proceed as follows, for the
mounting
:
– Turn the hub clamp until the fastening screw head is aligned with one of the access holes on gear
reducers flange, after having removed the relevant closure plugs;
– do not modify the axial position of the hub clamp supplied from workshop, as this position is the
excellent one in order to achieve the maximum tightening effect;
– push the motor up to shoulder;
– tighten the motor fastening screws or nuts to gear reducer motor flange;
–
tighten the hub clamp by
dynamometric key up to the tightening
torque specified in tab. 9.2.1; during
this operation pay attention not to
modify the axial position of hub clamp;
–
screw again the closure plugs of
access holes to gear reducer flange;
For the disassembly, proceed as follows:
–
acting on motor shaft rear end,
whenever possible, or disconnecting the gear reducer from machine and acting on gear reducer low
speed shaft (with brake motor the brake must be released), align the wrench hole with the tightening
screw of hub clamp;
– loosen the tightening screw and consequently the hub clamp (taking care not to modify the axial
position of hub clamp);
– unscrew the motor fastening screws of nuts to gear reducer flange;
– disassemble the motor.
Tab. 9.2.1 - Tightening torque for hub clamp
Gear reducer size
Screw
M
s
2I
3I
UNI 5931
N m
160 ... 225
200 ... 280
M12
×
45 cl. 12.9
143
250... 360
320 ... 360
M12
×
45 cl. 12.9 Ød
75
143
M14
×
50 cl. 8.8 Ød = 80
135
Содержание Rossi A Series
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