K.940.V06.GB
ROBA®-ES
ww
w.m
ayr.d
eThe Backlash-free FlexibleShaft Coupling forThe Backlash-free FlexibleShaft Coupling for
Machine ToolsPrinting MachineryPositioning Drives
● Simple plug-in blind assembly● Vibrational damping● Maintenance-free
powertransmission
2
cloc
kwis
e ro
tatio
nan
ti-cl
ockw
ise
rota
tion
traditional flexible coupling
torque
radial deflection
f backlash = 0f backlash = 0f backlash
f max
with TK max
f max
ROBA®-ESsmoothes vibration critical drive systems.
An elastomeric coupling in high precision servo axis drives?Of course, but only if it is the mayr® ROBA®-ES!The ROBA®-ES is not just another elastomeric coupling.The ROBA®-ES is a zero-backlash shaft coupling with damping and torque transmissionproperties not possible with conventional couplings.
ROBA®-ES - flexible and backlash-free smartflex® - torsionally rigid and backlash-freeBacklash is the angular tolerance between input and output, alsoknown as circumferential backlash. Many traditional flexible couplings have backlash due to their design.
mayr®-couplings in the series ROBA®-ES,smartflex® and ROBA®-DS for backlash-free torque transmission.
The couplings differentiate in their dampingbehaviour and torsional stiffness.
■ The ROBA®-ES is torsionally flexibleand vibrational damping. Its torsionallystiffness is 2-4 times higher comparedto tooth belt drives.
■ The smartflex® and ROBA®-DS aretorsionally rigid all-steel flexible couplings with the smallest torsionalangle with maximum torque. Due totheir transmission element designs insteel they do not have any dampingfeatures.
■ Zero-backlash torque transmissiondue to optional elastomeric elements where the hardness,stiffness and damping behaviourcan be varied.
■ Compensation of radial,axial and angular shaftmisalignments.
■ Simple plug-in blind assembly,maintenance media and temperature resistant guaranteehighest operational reliability.
powertransmission
ROBA®-ES
ROBA®-ES smartflex®
ROBA®-ES, the alternative for traditional torsionally rigid shaft couplings.
®
3
power transmission
sets the standards for innovative and technically ecconomic solutions.
You profit from our
quality – experience – competence
Contact us directly under
+49-8341/804-241or at your local sales office
ROBA®-ES
CONTENTS STRUCTURAL SHAPES
Page
Structural shapes 3
Technical data and dimensions 4 – 9
Technical explanations 10
Mounting examples 10
Assembly – Mounting instructions 11
Coupling design + selection 12 – 13
ROBA®-ES with clamping hubs
Page 7
ROBA®-ES with shrink discs
Pages 8 – 9
Page 6
ROBA®-ES with keyways
Type 940._00._
Type 940._22._
Type 940. _11._
drawn displaced
powertransmission
®
4
ROBA®-ES
Elastomeric elementsThe elastomeric elements are the central component of the ROBA®-ES coupling.They define the application range and behaviour of the shaftconnection by the permissible torque, stiffness, damping and misalignment values.
By the use of a new polyurethane material and a special injectionmoulding a high degree of dimensional stability and uniformity of theteeth of elastomeric element is achieved.
The elastomeric elements are available in different shore hardnesses.
The teeth of the flexible elastomeric element are laterallly chamferedto ease blind assembly.
Temperature influenceThe temperatures arising during operation effect a considerable influence on the design of the ROBA®-ES coupling (see selection onpage 12).
Medium resistanceThe elastomeric elements are resistant against
• pure mineral oils (lubricating oils) • and anhydrous grease
The resistance against fuels is similar, for example• standard petrol• diesel oil• kerosene
Damage can occur in case of the longer action of• alcohol or• aromatic fuels (super petrol)
The elastomer used is resistant against hydrolisis. Water or seawaterdoes not cause any essential alteration of the mechanical characteristicseven after many years contact contrary to other polyurethane material.However, hot water reduces the mechanical strength.
Please contact the factory in case of difficult environmental conditions.
SelectionROBA®-ES couplings can be varied essentially in their features byusing different elastomeric elements. Due to their different dampingcharacteristics and the stiffness of the elastomer not being linear thiselement has more parameters contrary to a steel-shaft connectionwhich should be considered for a selection.
Therefore, the coupling has to be selected carefully (see selection onpage 12).
Elastomeric elementHardness[Shore]
80 Sh A
92 Sh A
98 Sh A
64 Sh D
blue
yellow
red
green
-50 to +80 to °C
-40 to +90 to °C
-30 to +90 to °C
-30 to +100 to °C
-60 to +120 °C
-50 to +120 °C
-40 to +120 °C
-40 to +140 °C
Colour Permissible temperature range
Continuous temperature Max. shorttermtemperature
powertransmission
®
5
ROBA®-ES
Torques
Permissible misalignment values
Spring characteristic
torque Type 940._ _ _ 1)
elastomeric hardness80 Sh A (blue)
elastomeric hardness92 Sh A (yellow)
elastomeric hardness98 Sh A (red)
elastomeric hardness64 Sh D (green)
TKN6)
[Nm]TK max[Nm]
TK max[Nm]
TK max[Nm]
TK max[Nm]
TKN6)
[Nm]TKN
6)
[Nm]TKN
6)
[Nm]size
14
19
24
28
38
42
48
14-32
19-37,5
24-50
4
5
17
46
-
-
-
4
4
12
8
10
34
92
-
-
-
8
8
24
8
10
35
95
190
265
310
8
8
25
16
20
70
190
380
530
620
16
16
50
13
17
60
160
325
450
525
13
14
43
26
34
120
320
650
900
1050
26
28
86
16
21
75
200
405
560
655
16
17
54
32
42
150
400
810
1120
1310
32
34
108
1) Perm. max. torques for Type 940._00._ and 940._11._ dependent on bore diameters d3/d4, see tables 1, 2 and 3, pages 7, 8 and 9.6) Perm. alternating torques, see clutch design page 12
shaft misalignmentsaxial radial angular
∆Ka80/92/98 Sh A
64 Sh D
[mm]
∆Kr80 Sh A
[mm]
∆Kr92 Sh A
[mm]
∆Kr98 Sh A
[mm]
∆Kr64 Sh D
[mm]
�80 Sh A
[°]
�92 Sh A
[°]
�98 Sh A
[°]
�64 Sh D
[°]size
14
19
24
28
38
42
48
14-32
19-37,5
24-50
1,0
1,2
1,4
1,5
1,8
2,0
2,1
1,0
1,2
1,4
0,21
0,15
0,18
0,2
-
-
-
0,21
0,15
0,18
0,15
0,1
0,14
0,15
0,17
0,19
0,21
0,15
0,1
0,14
0,09
0,06
0,1
0,11
0,12
0,14
0,16
0,09
0,06
0,1
0,06
0,04
0,07
0,08
0,09
0,1
0,11
0,06
0,04
0,07
1,1
1,1
1,1
1,3
-
-
-
1,1
1,1
1,1
1,0
1,0
1,0
1,0
1,0
1,0
1,0
1,0
1,0
1,0
0,9
0,9
0,9
0,9
0,9
0,9
0,9
0,9
0,9
0,9
0,8
0,8
0,8
0,8
0,8
0,8
0,8
0,8
0,8
0,8
static torsional stiffness dynamic torsional stiffness static radial stiffness
CT stat.
80 Sh A
[Nm/rad.]
CT stat.
92 Sh A
[Nm/rad.]
CT stat.
98 Sh A
[Nm/rad.]
CT stat.
64 Sh D
[Nm/rad.]
CT dyn.
80 Sh ACT dyn.
92 Sh ACT dyn.
98 Sh ACT dyn.
64 Sh DCr
80 Sh ACr
92 Sh ACr
98 Sh ACr
64 Sh D
[Nm/rad.] [Nm/rad.] [Nm/rad.] [Nm/rad.] [N/mm] [N/mm] [N/mm] [N/mm]size
14
19
24
28
38
42
48
14-32
19-37,5
24-50
50
350
820
1300
-
-
-
50
280
600
80
820
2300
3800
5600
9800
12000
80
660
1700
120
900
3700
4200
7400
13800
15100
120
720
2700
230
1400
4500
7000
9000
15000
28500
230
1120
3300
120
1050
1300
2200
-
-
-
120
840
1000
240
1800
4800
6800
11900
20500
22800
240
1440
3600
300
2200
7600
10100
19900
31100
44900
300
1760
5700
730
4200
10800
17200
30500
64900
102800
730
3360
8100
180
700
800
950
-
-
-
180
560
600
300
1200
1900
2100
2900
4100
4500
300
960
1500
470
2100
2800
3500
4800
5400
6200
470
1680
2100
960
2700
4200
4900
5600
6900
8200
960
2160
3200
Only available with AP-design (page 9):
Only available with P-design (page 9):
Only available with AP-design (page 9):
powertransmission
®
6
ROBA®-ES with keyways Type 940._22._
Sizes 14 to 48 Sizes 14 to 48
mass momentsof inertia
J
weight max.speednmax.
boreø d5
1)
dimensions [mm]per hub and max. bore
[kgm2] [kg] [rpm] min. max.size 2)
14
19
24
28
38
42
48
2,8x10-6
20,4x10-6
50,8x10-6
200,3x10-6
400,6x10-6
2246x10-6
3786x10-6
0,020
0,066
0,132
0,253
0,455
1,850
2,520
19000
14000
10600
8500
7100
6000
5600
6
6
8
10
12
14
20
15
24
28
38
45
55
601) Recommended connection of fits H7/K62) Further sizes and types on request
ROBA®-ES couplings are supplied either without a bore (machiningby customer) or with finish bore and keyway JS9 (DIN 6885/1). There is a set screw in the hub for an axial attachment which is displaced by 180° to the keyway (Fig. 4).
Up to size 38 aluminium is used as hub material and steel from size 42.Preferred bores are available ex stock.
a
2
4
4
5
5
5
5
b
10
12
14
15
18
20
21
D
-
-
-
-
-
75
-
DH
30
40
55
65
80
95
105
dH
10,5
18
27
30
38
46
51
E
13
16
18
20
24
26
28
G
M4
M5
M5
M6
M8
M8
M8
L
35
66
78
90
114
126
140
l111
25
30
35
45
50
56
N
-
-
-
-
-
28
-
s
1,5
2,0
2,0
2,5
3,0
3,0
3,5
t
5
10
10
15
15
20
25
14 ÷ 48elastomeric hardness 98 Sh A (red) . . . . . . . . . . . . . .0elastomeric hardness 92 Sh A (yellow) . . . . . . . . . . .1elastomeric hardness *80 Sh A (blue) . . . . . . . . . . . . .5elastomeric hardness 64 Sh D (green) . . . . . . . . . . . .6
Example: order number 42/940.022.F/Ø d5 30/Ø d5 30
Order example:To be included when ordering,please state: size type bore Ø bore Ø
Order No. 940. _ 22._
possible ø d5see table of dimension
A (alu-design up to size 38)F (steel-design from size 42 on)
d5 H7 d5
H7
*only up to size 28
drawn displaced only for size 42
powertransmission
®
We reserve the right to make dimensional and design alterations.
7
ROBA®-ES with clamping hubs Type 940._00._
Sizes 14 to 48
mass momentsof inertia
J
weight max.speednmax.
boreø d3
tighteningtorques
clampingscrews
TA
per hub and max. bore
[kgm2] [kg] [rpm] min. max. [Nm]size 2)
14
19
24
28
38
42
48
2,8x10-6
20,4x10-6
50,8x10-6
200,3x10-6
400,6x10-6
2246x10-6
3786x10-6
0,020
0,066
0,132
0,253
0,455
1,850
2,520
19000
14000
10600
8500
7100
6000
5600
6
10
15
19
20
28
35
15
20
28
35
45
45
55
1,4
10,0
10,0
25,0
25,0
25,0
902) Further sizes and types on request
ROBA®-ES couplings with clamping hubs are designed for fast andsafe assembly or disassembly. They don’t have a keyway. The tightening torque (TA) of the clamping screws must be observed inorder to guarantee a reliable, friction torque transmission.
Please observe the max. permissible torques (Table 1). The hubs aremade of aluminium up to size 38, from size 42 on steel is used.On request the clamping hub can be additionally designed withkeyway.
14 ÷ 48elastomeric hardness 98 Sh A (red) . . . . . . . . . . . . . .0elastomeric hardness 92 Sh A (yellow) . . . . . . . . . . .1elastomeric hardness *80 Sh A (blue) . . . . . . . . . . . . .5elastomeric hardness 64 Sh D (green) . . . . . . . . . . . .6
Example: order number 42/940.000.F/Ø d3 30/Ø d3 30
Order example:
To be included when ordering,please state: size type bore Ø bore Ø
Order No.: 940. _ 00._
possible ø d3see table of dimension
The bore fit can vary due to thesplit hub.
A (alu-design up to size 38)F (steel-design from size 42 on)
d3 F7 d3
F7
*only up to size 28
size
14
19
24
28
38
42
48
ø 6
2,5
-
-
-
-
-
-
ø 7
3,0
-
-
-
-
-
-
ø 8
3,4
-
-
-
-
-
-
ø 9
3,8
-
-
-
-
-
-
ø 10
4,2
23
-
-
-
-
-
ø 11
4,7
25
-
-
-
-
-
ø 12
5,1
27
-
-
-
-
-
ø 14
6,0
32
-
-
-
-
-
ø 15
6,4
34
34
-
-
-
-
ø 16
-
36
36
-
-
-
-
ø 19
-
43
43
79
-
-
-
ø 20
-
45
45
83
83
-
-
ø 22
-
-
50
91
91
-
-
ø 24
-
-
54
100
100
-
-
ø 25
-
-
57
104
104
-
-
ø 28
-
-
63
116
116
116
-
ø 30
-
-
-
124
124
124
-
ø 32
-
-
-
133
133
133
-
ø 35
-
-
-
145
145
145
238
ø 38
-
-
-
-
158
158
259
ø 40
-
-
-
-
166
166
272
ø 42
-
-
-
-
174
174
286
ø 45
-
-
-
-
187
187
306
ø 48
-
-
-
-
-
-
327
ø 50
-
-
-
-
-
-
341
ø 55
-
-
-
-
-
-
360
prefered bores ø d3 (clamping hub) and friction transmittable torques TR [Nm]of the clamping hub
Table 1 The transmittable torques of the clamping connection consider the max. tolerance with shaft k6/bore F7. The torque decreases in case of larger tolerances.
powertransmission
®
only for size 42
We reserve the right to make dimensional and design alterations.
a
2
4
4
5
5
5
5
b
10
12
14
15
18
20
21
D
-
-
-
-
-
75
-
DH
30
40
55
65
80
95
105
DK
32,2
47
56,4
72,6
83,3
78,8
108
dH
10,5
18
27
30
38
46
51
E
13
16
18
20
24
26
28
L
35
66
78
90
114
126
140
l111
25
30
35
45
50
56
M1
M3
M6
M6
M8
M8
M8
M12
N
-
-
-
-
-
28
-
s
1,5
2,0
2,0
2,5
3,0
3,0
3,5
t1
5,5
12
12
13,5
20
20
21
t2
11
14
20
24
30
27,5
36
dimensions [mm]
8
ROBA®-ES with shrink disc hub(aluminium) Type 940._11.A
Sizes 14 to 38/45
mass momentsof inertia
J
weight max.speednmax.
boreø d4
tighteningtorques
strainingscrews
TA
dimensions [mm]per hub and max. bore
[kgm2] [kg] [rpm] min. max. [Nm]size
14
19
24
28
38
0,07x10-4
0,31x10-4
1,35x10-4
3,13x10-4
9,60x10-4
0,049
0,12
0,28
0,45
0,95
28000
21000
15500
13200
10500
6
10
15
19
20
14
20
28
38
45
1,3
3,0
6,0
6,0
10,0
The hub body consists of aluminium for this design, the ring is madeof annealed, phosphated steel. The dimensions are as the P-design(page 9). Optimum true running is achieved by the symmetry, the missing keyways and radial bores. Therefore, essential higher speeds
than with other hub designs (observe diagram balancing, page 11) arepossible.The torque is transmitted to the shaft via friction. Therefore, observethe max. torques of this shaft-hub connection (Table 2).
a
2
4
4
5
5
b
10
12
14
15
18
DH
30
40
55
65
80
dH
10,5
18
27
30
38
E
13
16
18
20
24
L
50
66
78
90
114
l118,5
25
30
35
45
M2
4xM3
6xM4
4xM5
8xM5
8xM6
s
1,5
2,0
2,0
2,5
3,0
14 ÷ 38/45elastomeric hardness 98 Sh A (red) . . . . . . . . . . . . . .0elastomeric hardness 92 Sh A (yellow) . . . . . . . . . . .1elastomeric hardness *80 Sh A (blue) . . . . . . . . . . . . .5elastomeric hardness 64 Sh D (green) . . . . . . . . . . . .6
Example: order number 38/940.011.A/Ø d4 30/Ø d4 30
Order example:
To be included when ordering,please state: size type bore Ø bore Ø
Order No.: 940. _ 11.A
possible ø d4see table of dimension
d4 H7 d4
H7
*only up to size 28
size
14
19
24
28
38
ø 6
7
-
-
-
-
ø 7
9
-
-
-
-
ø 8
11
-
-
-
-
ø 9
13
-
-
-
-
ø10
15
33
-
-
-
ø11
17
38
-
-
-
ø14
24
55
-
-
-
ø15
-
61
56
-
-
ø16
-
67
62
-
-
ø17
-
73
68
-
-
ø18
-
78
74
-
-
ø19
-
84
81
141
-
ø20
-
88
87
153
197
ø22
-
-
100
177
228
ø24
-
-
112
203
261
ø25
-
-
118
216
279
ø28
-
-
135
256
332
ø30
-
-
-
282
368
ø32
-
-
-
308
405
ø35
-
-
-
343
460
ø38
-
-
-
373
513
ø40
-
-
-
-
547
ø42
-
-
-
-
577
ø45
-
-
-
-
617
prefered bores ø d4 and friction transmittable torques TR [Nm]of the shrink discs
Table 2 The transmittable torques of the shrink connection consider the max. tolerance with shaft k6/bore H7. The torque decreases in case of larger tolerances.
powertransmission
®
We reserve the right to make dimensional and design alterations.
9
ROBA®-ES with shrink disc hub made of steelType 940._11._
The hub body consists of steel (oiled), the ring is made of annealedphosphated steel. This design is available in a standard version anda version to DIN 69002. The DIN version has an elastomeric elementwith central, standard bore and standard bore diameters in the hubs.
The DIN variation has been designed for the use in spindles with shortbores and multi-spindle heads. This DIN-design combines robust-ness with steel hubs precision. For designs with dynamic or alterna-ting load this design should be selected.
Order example:
Sizes 14-32 to 48 Sizes 14-32 to 28 acc. to DIN 69002mass
momentsof inertia
J
weight max.speednmax.
boreø d4
tighteningtorques
strainingscrews
TA
dimensions [mm]per hub
and max. bore
[kgm2] [kg] [rpm] min. max. DIN7) [Nm]size
14-32
19-37,5
19
24-50
24
28
38
42
48
0,11x10-4
0,37x10-4
0,46x10-4
1,36x10-4
2,01x10-4
4,38x10-4
13,2x10-4
31,7x10-4
52,0x10-4
0,1
0,16
0,19
0,33
0,44
0,64
1,3
2,3
3,1
28000
21000
21000
15500
15500
13200
10500
9000
8000
6
10
10
15
15
19
20
28
35
14
16
20
24
28
38
45
50
60
14
16
19
24
25
35
-
-
-
1,3
3,0
3,0
6,0
6,0
6,0
10,0
25,0
30,07) Elastomeric elements with DIN-bore only with 98 Sh (red), Type 940.011.P
a
2
4
4
4
4
5
5
5
5
b
10
12
12
14
14
15
18
20
21
DH
32
37,5
40
50
55
65
80
95
105
dH
10,5
18
18
27
27
30
38
46
51
d6
17
19
22
29
30
40
46
55
60
d7 7)
8,5
9,5
9,5
12,5
12,5
14,5
-
-
-
E
13
16
16
18
18
20
24
26
28
L
50
66
66
78
78
90
114
126
140
l118,5
25
25
30
30
35
45
50
56
M2
4xM3
6xM4
6xM4
4xM5
4xM5
8xM5
8xM6
4xM8
4xM8
s
1,5
2,0
2,0
2,0
2,0
2,5
3,0
3,0
3,5
t2
3
4
4
5
5
5
5
5
6
14 ÷ 48elastomeric hardness 98 Sh A (red) . . . . . . . . . . . . . .0elastomeric hardness 92 Sh A (yellow) . . . . . . . . . . .1elastomeric hardness *80 Sh A (blue) . . . . . . . . . . . . .5elastomeric hardness 64 Sh D (green) . . . . . . . . . . . .6
Example: order number 42/940.011.F/Ø d4 30/Ø d4 30
To be included when ordering,please state: size type bore Ø bore Ø design
Order No.: 940. _ 11._
possible ø d4see table ofdimension
P (steel design up to size 38)F (steel design from size 42 on)
DINno indicationfor standard
d4 H6 d4
H6
*only up to size 28
size
14-32
19-37,5
19
24-50
24
28
38
42
48
ø 6
7
-
-
-
-
-
-
-
-
ø 7
9
-
-
-
-
-
-
-
-
ø 8
11
-
-
-
-
-
-
-
-
ø 9
13
-
-
-
-
-
-
-
-
ø10
15
26
33
-
-
-
-
-
-
ø11
17
30
38
-
-
-
-
-
-
ø14
24
45
55
-
-
-
-
-
-
ø15
-
50
61
45
56
-
-
-
-
ø16
-
60
67
50
62
-
-
-
-
ø17
-
-
73
54
68
-
-
-
-
ø18
-
-
78
60
74
-
-
-
-
ø19
-
-
84
65
81
141
-
-
-
ø20
-
-
88
70
87
153
197
-
-
ø22
-
-
-
85
100
177
228
-
-
ø24
-
-
-
112
112
203
261
-
-
ø25
-
-
-
-
118
216
279
-
-
ø28
-
-
-
-
135
256
332
300
-
ø30
-
-
-
-
-
282
368
350
-
ø32
-
-
-
-
-
308
405
400
-
ø35
-
-
-
-
-
343
460
500
450
ø38
-
-
-
-
-
373
513
600
500
ø40
-
-
-
-
-
-
547
680
600
ø42
-
-
-
-
-
-
577
730
720
ø45
-
-
-
-
-
-
617
790
850
ø48
-
-
-
-
-
-
-
850
1000
ø50
-
-
-
-
-
-
-
880
1180
ø52
-
-
-
-
-
-
-
-
1270
ø55
-
-
-
-
-
-
-
-
1353
ø58
-
-
-
-
-
-
-
-
1428
ø60
-
-
-
-
-
-
-
-
1471
prefered bores ø d4 (shrink disc) and friction transmittable torques TR [Nm]of the shrink discs
Table 3 The transmittable torques of the shrink connection consider the max. tolerance with shaft k6/bore H6. The torque decreases in case of larger tolerances.
powertransmission
®
We reserve the right to make dimensional and design alterations.
10
ROBA®-ES
Technical explanations Shaft misalignmentsThe ROBA®-ES coupling compensates radial, axial and angular shaftmisalignments (Fig. 4) without influencing its backlash-free design.However, the permissible misalignments indicated on page 5 mustnot achieve simultaneously the maximum values. In case severalkinds of misalignments occur simultaneously they influence eachother, i. e. the permissible value of the misalignment depend on eachother corresponding to Fig. 3.The amount of the actual misalignments, in percentage of the maximumvalue, must not exceed 100 %.The permissible misalignment values indicated on page 5 refer to acoupling use with nominal torque, an ambient temperature of +30 °Cand an operating speed of 1500 rpm.
Fig. 1
radial misalignment axial displacement angular misalignment
Fig. 4
Fig. 3
ROBA®-ES couplings consist of two coupling hubs and one flexible intermediate ring in the form of a star (Fig. 1).
ROBA®-ES couplings are designed especially for backlash-freeuse at comparatively high speeds.
ROBA®-ES couplings are mainly used in measurement and control techniques as well as in material processing
Supply conditionROBA®-ES couplings are supplied ready for assembly.The flexible elastomeric element is pressed under a slight pretension(Fig. 2) into the claws which are machined in a special shape.
Mounting examples
ROBA®-ES with keyways
ROBA®-ES with clamping hubs
ROBA®-ES with shrink discs
Fig. 2
Due to this pre-tension the principle of the backlash-free torque transmission is achieved.
ROBA®-ES couplings are supplied in four torque variations, i.e. withfour alternative flexible intermediate rings different in shore hardnessand colour (see type chart, page 5).
Due to the small dimensions and low inertia, excellent installationpossibilities, even in compact areas, are achieved.
powertransmission
®
coupling hub
flexible intermediate ring
angular misalignment
axial displacement
rad
ial m
isal
ignm
ent
11
ROBA®-ES
The cone surfaces of the shrink disc hubs are greased in the factorywith a special grease (if necessary, grease it again with a special greaseafter cleaning).
– Attach shrink disc hubs on both shaft ends, align them and tightenshrink disc bolts slightly until contact.
– Tighten shrink disc bolts uniformly step by step and crosswise tothe indicated tightening torque (see pages 8 and 9) by means of atorque wrench.
– To dismantle, unscrew all shrink disc bolts to release somethreads.
– Unscrew the shrink disc bolts located beside the extraction holesand screw them into the extraction holes until contact.
– Tighten shrink disc bolts uniformly step by step and crosswise, loosen the shrink disc from the conical shrink disc hub.
Safety regulationsThe coupling rotates during operation. It must be secured from theuser against unintended contact. Assembly and maintenance shouldbe made by well trained specialists.
BalancingKeyway hubs and clamping hubs:The keyway hubs and clamping hubs rotate with max. speed with acircumferential speed of 30 m/s. They are not balanced as standard.
Shrink disc hubs:The shrink disc hubs keep the balance quality G = 6,3 up to the speednG (corresponds to approx. 30 m/s) without balancing. Balancing is recommended in case the speed is higher. The hubs arebalanced single. The diagram indicates reference values for which werecommend to balance the coupling elements.
The quiet running of a machine or equipment depends not only onbalancing quality of the coupling, but also on many parameters asstiffness or distance of the adjacent bearings. Therefore, there is nofixed rule at which conditions balancing is necessary.
Assembly – Mounting indications Assembly of the shrink disc hub(ROBA®-ES Type 940._11._)Due to its optimum construction the ROBA®-ES coupling offers the
possibility to connect the coupling axially after the hubs have beenassembled onto the input or output shafts. Any additional fitting andspecial housings are not necessary (see mounting examples page 10).
Please observe!!!
The installation or the installation dimensions must be maintained toavoid thrust load on the faces of the flexible element.
By observing the installation dimensions (especially dimension "E”,as shown on pages 6 – 9) it is guaranteed that the flexible elementcan move axially.
For elastomeric elements with different amount of dimples the sidewith more dimples must be assembled at first (facilitates assembly).
When pushing both coupling halves together an axial assembly forcemust be exerted due to the pre-tension of the flexible element.
The axial assembly force can be decreased by slightly greasing theelastomeric element. ATTENTION: Only use greases on mineral oilbase and without additions, vaseline can also be used.
diagram: balancing of the shrink disc hub
powertransmission
®
balancing recommended
spee
d (r
pm
)
size
12
Selection of ROBA®-ES couplings
1. Approximate calculation of the coupling torque:1.1. TN from the nominal capacity
TN =
1.2. Dynamic torques TS and TW (5.1 and 5.2):
Excitation at the input side: Excitation at the load side:
Shock torque: TS = TAS x x SA Shock torque: TS = TLS x x SL
Alternating torque: TW = TAW x x VR Alternating torque: TW = TLW x x VR
2. Comparison of the existing torques in the coupling with the permissible torquesThe coupling must be designed in this way that the existing loads do not exceed the permissible values in any operational condition (5.3).
2.1. Load by the nominal torqueTKN ≥ TN x S� x SD
2.2. Load by shock torques (5.4)TK max ≥ TS x SZ x S� + TN x S� x SD
2.3. Load during transit of the resonance (5.5)TK max ≥ TS x SZ x S� x VR + TN x S� x SD
2.4. Load by continuous alternating torque cycle operation (5.6 and 5.7)Permissible alternating torque of the coupling:
TKW = 0.25 x TKN (for aluminium hubs)
TKW = 0.35 x TKN (for steel hubs)
TKW ≥ TW x S� x Sf x SD
3. Examination of the permissible misalignment∆Ka ≥ ∆Wa x S�
∆Kr ≥ ∆Wr x S� x Sn
∆Kw ≥ ∆Ww x S� x Sn
Observe Fig. 3 (page 10) in case several kinds of misalignment occur simultaneously.
4. Examination of the frictional resistance of the hub connectionTR > Tmax : Tmax is the max. torque which occurs in the coupling.
Values for TR are mentioned on pages 7, 8 and 9.
5. Explanations5.1. The determination of the torque existing on the coupling is valid, when the shaft coupling is the torsional softest element in the
equipment and, therefore, the equipment can be considered as two-mass oscillator. If this is not the case the calculation of the torque existing on the coupling requires further calculation procedures.
5.2. The shock factors SA / SL describe the shock process. A square process of the shock torque is the heaviest shock (SA/SL=2.0). Aneven sine process of the shock torque is a light shock (SA/SL = 1.2).
5.3. The torsional rigidity factor SD can influence the dimensioning of the coupling considerably. It must be checked, if the coupling isbetween the object to be positioned and a measuring system (indirect measurement). If this is not the case SD=1 can be selected.
5.4. TS, the impact torque existing in the coupling is the maximum torque existing in the coupling during the shock minus nominal drive torque which acts in the coupling during standard operation.
5.4. TS = Tmax, impact - TN5.5. In case a drive is operated supercritical, i. e. the operating speed n is over the resonance speed nR, the passing of the resonance
generates special loads.5.4. In case of a very fast passing of the resonance below the operating speed only a few resonance peaks occur. The alternating
torque in resonance can, therefore, be compared with the maximum torque of the coupling (also see 5.7).
5.6. Sf allows the dependance on the frequency of the service life. The dependance on the frequency is only considered over 5 Hz.5.7. In case of worth mentioning vibrating excitation the resonance should be displaced off the operating area by selecting a suitable
torsional stiffness of the coupling.
ROBA®-ES
9550 x PAN/LN
n
JL
JA + JL
JA
JA + JL
JL
JA + JL
JA
JA + JL
powertransmission
®
13
nR = resonance speed
[rpm]nR = √CT dyn.
√
JA+JL
JA xJL
no positioningrequirement
simple positioningequipment
machine tools torsional angletransmitter
1 2–5 3–8 10–>
SZ = starting factor/shock frequency S� = safety factor for temperature
T [°C] -30 °C / +30 °C +60 °C +90 °C
S� 1 1,5 2
Sf = frequency factor
f in Hz ≤ 5 > 5
f5
SL or SA = shock factor
impacts
slight impacts 1,2
medium impacts 1,6
heavy impacts 2,0
SA or SL
30π
fR = resonance frequency
[1/s]fR = √CT dyn. JA+JL
JA xJL
12π
ROBA®-ES
SD = rigidity factor
f indicates the load change per second(Hz = 1/s)
Terms and factors for the coupling designPAN/LN [kW] Capacity at the input side/load sideTR [Nm] Transmittable torque (friction tight, table
pages 7, 8, 9)TAS/AW [Nm] Exciting torque input sideTLS/LW [Nm] Exciting torque load sideTN [Nm] Nominal drive torqueTW [Nm] Alternating torqueTS [Nm] Peak torque Tmax [Nm] Max. torque in the couplingTKN [Nm] Permissible nominal torqueTKmax [Nm] Permissible max. torqueTKW [Nm] Permissible continuous alternating torqueJA [kgm2] Mass moment of inertia input sideJL [kgm2] Mass moment of inertia load side∆Ka [mm] Permissible axial displacement∆Kr [mm] Permissible radial misalignment
∆Kw [°] Permissible angular misalignment∆Wa [mm] Axial shaft displacement∆Wr [mm] Radial shaft misalignment∆Ww [mm] Angular shaft misalignmentcT [Nm/rad] Torsional stiffnessn [rpm] Nominal speednR [rpm] Resonance speedSA/L [ - ] Shock factor input side/load sideSD [ - ] Torsional stiffness factorSZ [ - ] Starting factor/shock frequencyS� [ - ] Temperature factorSf [ - ] Frequency factorVR [ - ] Resonance factorf [1/s]=[Hz] Load factorfR [Hz] Resonance frequency
Operating factors:
n [rpm]
VR = resonance factor
Sn = speed factor
n/nRf/fR
VR
Sn
blue: elastomeric element 80 Sh Ayellow: elastomeric element 92 Sh Ared: elastomeric element 98 Sh Agreen: elastomeric element 64 Sh D
Sf 1
S/h 0-100 101-200 201-400 401-800 801-1600
SZ 1 1,2 1,4 1,6 1,8
powertransmission
®
14
In addition to the backlash-free, flexible ROBA®-ES mayr® offers two further backlash-freecouplings for compensation of shaft misalignments and torsionally rigid torque transmission.Combinations of ROBA®-ES couplings and EAS®-NC-safety clutches additionally offerreliable protection of overload damage together with the backlash-free connection of twoshafts.For detailed catalogues on our ROBA®-DS and smartflex® couplings as well as EAS-NC®
clutches please contact your nearest mayr® representation.
Further Zero-Backlash Shaft Couplings from mayr®
ROBA®-DS torsionally rigid all-steel flexible coupling
ROBA®-DS couplings guarantee reliable torque transmission evenunder difficult conditions and can be used at high temperatures.
The coupling operates similar to a cardan joint, however, disk packagescompensate axial, radial and angular misalignments of the shafts.These packs are alternately connected with input or output hub/sleeve.A backlash-free torque transmission is guaranteed. Various backlash-free shaft hub connections as well as keyway connectionsare available.
smartflex® backlash-free, torsionally rigidsteel bellows coupling
smartflex®-couplings have an increased misalignment capability withradial shaft misalignment up to three times that of standard steel bellows coupling.Reduced costs by using them. Highly competitive price/value ratio,fast and easy shaft attachment, high reliability and no maintenance arethe result.These shaft couplings can especially be used for dynamic and reversingdrives due to the backlash-free shaft attachment, backlash-free torque transmission and high torsional rigidity, but also for drives where problems arise with standard all-steel couplings.
EAS®-NC lastic backlash-free
The EAS®-NC limits the torque to an exact adjustable value and reliablyprevents costly overload damage on your machines and equipment.
The ROBA®-ES is the compensating component in the drive system.It compensates shaft misalignment and damps vibrations. All componentsconnected with the torque transmission operate backlash-free.
EAS®-NC and ROBA®-ES cope with critical drive axes.
powertransmission
®
15
powertransmission
Worldwide representation
Great BritainMayr Transmissions Ltd.Valley Road, Business ParkKeighley, BD21 4LZWest YorkshireTel.: 0 15 35/66 39 00Fax: 0 15 35/66 32 [email protected]
ItalyMayr Italia S.r.l.Viale Veneto, 335020 Saonara (PD)Tel.: 0 49/8 79 10 20Fax: 0 49/8 79 10 [email protected]
FranceMayr France S.A.Z.A.L. du MinopoleBP 1662160 Bully-Les-MinesTel.: 03.21.72.91.91Fax: [email protected]
USAMayr Corporation4 North StreetWaldwickNJ 07463Tel.: 2 01/4 45-72 10Fax: 2 01/4 45-80 [email protected]
SingaporeMayr Transmission (S)Pte. Ltd. – Blk 133Jurong East Street 13Unit 03-291Singapore 600133 AseanTel.: 0065/65601230Fax: 0065/[email protected]
ChinaMayr ShanghaiRoom 608, No. 1277West Zhongshan Road,Conch Building,200051 Shanghai, ChinaTel.: 021/62953138Fax: 021/[email protected]
KoreaMayr Korea60-11, Woongnam-DongROK ChangwonRep. of KoreaTel.: 055/262-4024Fax: 055/[email protected]
Headquarters Chr. MayrGmbH + Co. KGEichenstraße 187665 MauerstettenTel.: 49-83 41/8 04-241Fax: 49-83 41/[email protected]://www.mayr.de
AustriaBenelux StatesBrazilCanadaCzech RepublicDenmarkFinlandGreece
your reliable partner
TaiwanGerman Tech Auto Co. Ltd.No. 58, Wu Chuan RoadWu-Ku Industrial ParkTaipei Hsien, TaiwanTel.: 02/22990237Fax: 02/[email protected]
IndiaNational EngineeringCompany (NENCO)J-225, M.I.D.C. BhosariPune 411026Tel.: 0202/7474529Fax: 0202/[email protected]
AustraliaTransmission Australia Pty. Ltd.22 Corporate Ave,3178 Rowville, VictoriaAustralienTel.: 039/755 4444Fax: 039/755 [email protected]
South AfricaTorque TransferPrivate Bag 9Elandsfontein 1406Tel.: 011/3458000Fax: 011/[email protected]
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PolandRomaniaRussiaSlovakiaSloveniaSpainSwedenThailand
Note:If a country is notshown, please referto headquarters orour web site to beadvised of the nearest responsibleagent.
SwitzerlandMayr Kupplungen AGTobeläckerstrasse 118212 Neuhausen
am RheinfallTel.: 0 52/6 74 08 70Fax: 0 52/6 74 08 [email protected]
Machine Tool Applications in ChinaDTC. Co.Ltd., Block 5th, No. 1699,East Zhulu Road,201700 Shanghai, ChinaTel.: 021/59883978Fax: 021/[email protected]
JapanSumitomo HI-PTC Sales Co., Ltd.3-5-8, Kandakaji-Cho,Chiyoda-KuTokyo J101-0045Tel.: 03/52563091Fax: 03/[email protected]
Turkey
your reliable partner
Safety clutches/torque limiters
❑ EAS®-Compact®/EAS®-NCPositive, absolutely backlash-free torque limiter
❑ EAS®-smartic®
Economic torque limiters with fast assembly❑ EAS®-element clutch/EAS®-elements
Load disconnecting protection for high torques ❑ EAS®-axial
Exact limitation of tensile and compressive forces❑ EAS®-Sp/EAS®-Sm/EAS®-Zr
Residual torque free disconnecting torque limiter with ON/OFF function❑ ROBA®-slip hubs
Load holding, friction type torque limiting clutch❑ ROBA®-contitorque
Magnetic continuous slip clutch
Shaft couplings
❑ smartflex®
Perfect precision coupling for servo and stepper motors❑ ROBA®-ES
Backlash-free and damping of vibration critical drives❑ ROBA®-DS/ROBA®-D
Backlash-free, torsionally rigid all-steel coupling❑ EAS®-control-DS
Low cost torque-measuring coupling
Electromagnetic brakes/clutches
❑ ROBA-stop® StandardMulti-functionally all-round safety brake
❑ ROBA-stop®-M motor brakesRobust, cost effective motor brake
❑ ROBA-stop®-SWaterproof, robust monobloc brake
❑ ROBA-stop®-Z/ROBA-stop®-silenzio®
Double security elevator brake❑ ROBA®-diskstop®
Compact quiet disk brake❑ ROBA®-topstop®
Brake systems for gravity loaded axes❑ ROBA®-linearstop
Backlash-free brake system for linear motor axes❑ ROBATIC®/ROBA®-quick/ROBA®-takt
Energise to engage electromagnetic pole face clutches and brakes, CBU
DC drives
❑ tendo®-PMPermanent-magnet D.C. motors
❑ tendo®-SC1 and 4 Q transistor controllers
Delivery Programme
20/1
0/20
05 IM
Telephon 083 41/804-241 Telefax 083 41/804 422http://www.mayr.deeMail: [email protected]
Chr. Mayr GmbH + Co. KGEichenstrasse 1D-87665 MauerstettenGermany