32
ROSSI
GEARMOTORS
UT.D 123 rev. 3
8.6 - Motor assembly/replacement
Since gearmotors are fitted with
standard
motors, motor
re placement – in case of failure – is extremely easy.
Simply observe the following instructions (after having observed the
safety instructions relevant to machine, see maintenance procedure
of ch. 8.1):
– be sure that motor’s category complies with the zone where it
is used and the mating surfaces are machined under accuracy
rating (UNEL 13501-69; DIN 42955);
– clean surfaces to be fitted, thoroughly. If painted, remove paint;
– check and, if necessary, lower the parallel key so as to leave a
clearance of 0,1
0,2 mm between its top and the bottom of the
keyway of the hole. If shaft keyway is without end, lock the key
with a pin.
When the motor shaft end is keyed direct to worm or to cylindrical
or bevel pinion (gearmotors: worm MR V, parallel shaft MR 3I sizes
140 ... 360 and MR 2I, right angle shaft MR Cl and MR C2I):
– 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;
– lubricate surfaces to be fitted against fretting corrosion.
Before disassembling motor sizes 200 ... 315 on MR 2I, 3I or ser-
vomotors (coupled with key and bronze bush with hub clamp)
and for gear reducer sizes 40 ... 81 design «square flange for
servomotors» proceed as follows:
– align tightening screw of hub clamp with the access hole;
– loosen the tightening screw and consequently the hub clamp;
– disassemble the motor.
When a cylindrical pinion is keyed onto the motor shaft end (gear-
motors: worm MR IV, 2IV; parallel shaft MR 3I sizes 50...125, MR 4I;
right angle shaft MR ICI, C3I; coaxial gearmotors):
– check that the fit-tolerance (standard locking) between hole and
shaft end is K6/j6 for D
28 mm, and J6/k6 for D
38 mm; key
length should be at least 0,9 pinion width;
– make sure that the motors have bearing location and overhang
(distance S) as shown in the following table;
1) Values advised in order to minimize sound levels. These values refer to the maximum
power of motor size; proportionally they increase when the applied power decreases. They
can double accepting higher sound levels (3÷5 dB(A)). These values
do not affect the
gearmotor compliance with ATEX directive
.
– locate the spacer (with sealant, check that between keyway
and motor shaft shoulder there is a grounded cylindrical part of at
least 1,5 mm) and pinion on the motor (pinion pre-heated to +80
+100 °C) locking the entire assembly by means of a bolt to the
butt-end or hub clamp;
– grease the pinion teeth, the sealing ring rotary seating and the ring
itself, and assemble carefully.
9 - Sound levels
Most of the ROSSI MOTORI-
DUTTORI product range is cha-
racterised
by
sound pressure
levels
L¯
pA
(mean value of mea-
surement, assuming nominal
load and input speed n
1
=
1 400 min
-1
, at 1 m from exter-
nal profile of gear reducer stan-
ding in free field on a reflecting
surface, according to ISO/CD
8579)
lower or equal to 85
dB(A).
The table indicates the pro-
ducts which
can exceed
a.m.
threshold. For further infor-
mation about sound levels of
every single product see ROSSI
MO TORIDUTTORI technical
catalogues.
Gear reducer/train of gears
i
N
Size
Parallel shaft
R I
3,15
160
4
200
R 2I
all
320
R 3I
all
400
R 4I
160
500
200
630
Right angle shaft R CI
all
320
R C2I
63
400
71
500
R C3I
all
630
Motor
Min dynamic load capacity
Max dimension
size
daN
‘S’
1)
Front
Rear
mm
63
450
335
16
71
630
475
18
80
900
670
20
90
1 320
1 000
22,5
100
2 000
1 500
25
112
2 500
1 900
28
132
3 550
2 650
33,5
160
4 750
3 350
37,5
180
6 300
4 500
40
200
8 000
5 600
45
225
10 000
7 100
47,5
250
12 500
9 000
53
280
16 000
11 200
56
gea reducer
motor
groove for pulling
pinion
U
T.C
725
