the backlash-free flexible shaft coupling for couplings/roba-es/k_… · the backlash-free flexible...

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


J


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.



Order example:

To be included when ordering,please state: size type bore Ø bore Ø

Order No.: 940. _ 00._


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


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


J


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


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

®


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


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



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

®


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]

HongkongHungaryIndonesiaIsraelMalaysiaNew ZealandNorwayPhilippines

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

the backlash-free flexible shaft coupling for couplings/roba-es/k_… · the backlash-free flexible...

Documents