K.940.V07.GB

ROBA-ESBacklash-free flexible shaft coupling

l Simple plug-in installationl Vibration-damping functionl Maintenance-free

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ROBA-ES

ROBA-ESfor smooth running in vibration-critical drive systemsA flexible coupling in high-precision servo axes? This concept is not a contradiction in terms, as the ROBA-ES coupling convinces customers even in critical applications with backlash-free torque transmission, ideal rigidity and optimum vibration damping.

ROBA-ES couplings are also available in ATEX design according to the directive 94/9 EC (ATEX 95).

ROBA-ES - flexible and backlash-free smartflex - torsionally rigid and backlash-freeBacklash is the angular tolerance between the input and the out-put, also known as torsional backlash. Many conventional flexible couplings are subject to backlash due to their construction type.

The mayr-couplings ROBA-ES, smartflex and ROBA-DS Type series transmit the torque backlash-free.

The couplings differ in damping behaviour and torsional rigidity:

The ROBA-ES is torsionally rigid and can damp vibrations to a small extent. Its torsional rigidity is 2 to 4 times higher than a toothed belt drive.

The smartflex and ROBA-DS are torsionally rigid all-metal couplings. They feature the smallest torsional angle at maximum torque. Due to the transmission element design in steel, they have no damping characteristics.

Backlash-free torque transmission due to pre-tensioned star-shaped elastomer element through which hardness, rigidity and damping behaviour can be varied.

Compensation of radial, axial and angular shaft misalignment.

Simple plug-in installation, maintenance-free function, agent resistance and temperature resistance guarantee highest operational safety.

ROBA-ES, the alternative to torsionally rigid shaft couplings.

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Standard flexible coupling

Torque

torsional angle

backlash = 0 backlash = 0 backlash

max

with TK max

max

ROBA-ES smartflex

ROBA-ES Contents

Elastomeric Elements Page 4

Nominal torques 4 to 1040 Nm Temperature Influence Page 4

Agent Resistance Page 4Max. axial displacement ,6 mm Torques Page 5Max. radial misalignment 0,5 mm Perm. Misalignment Values Page 5Max. angular misalignment 1,3 Spring Rigidity Page 5

ROBA-ES with keyways Type 940._._ Page 6

Nominal torques 4 to 1040 Nm Technical Data Page 6Bores 6 to 80 mm Dimensions Page 6Max. axial displacement ,6 mm Order Example Page 6Max. radial misalignment 0,5 mm

Max. angular misalignment 1,3

ROBA-ES with clamping hubs Type 940._00._ Page 7

Nominal torques ,5 to 1040 Nm Technical Data Page 7Bores 6 to 80 mm Dimensions Page 7Max. axial displacement ,6 mm Order Example Page 7Max. radial misalignment 0,5 mm

Max. angular misalignment 1,3

ROBA-ES with aluminium shrink disk hubs Type 940._11. A Page 8

Nominal torques 7 to 617 Nm Technical Data Page 8Bores 6 to 45 mm Dimensions Page 8Max. axial displacement 1,8 mm Order Example Page 8Max. radial misalignment 0, mm

Max. angular misalignment 1,3

ROBA-ES with steel shrink disk hubs Types 940._11.P and 940._11.F Page 9

Nominal torques 7 to 1040 Nm Technical Data Page 9Bores 6 to 75 mm Dimensions Page 9Max. axial displacement ,6 mm Order Example Page 9Max. radial misalignment 0,5 mm

Max. angular misalignment 1,3

Frictionally-locking transmittable torques on clamping and shrink disk hubs Page 10

Technical Explanations Page 1

Installation Guidelines and Examples Page 13

Coupling Dimensioning Page 14

3

Elastomeric Elements

ROBA-ES elastomeric elements

The elastomeric elements are the central element of the ROBA-ES-coupling. They define the application range as well as the shaft connection behaviour via the permitted torque, rigidity, damping and misalignment values.

By using a unique polyurethane material and a special injection procedure, it is possible to achieve a high dimensional accuracy and evenness in the teeth of the elastomeric element.

The elastomeric elements are available in different shore hardnesses.

The teeth of the elastomeric element are chamfered at the sides. This makes blind installation easier.

Temperature InfluenceThe ambient temperatures present during operation have a considerable effect on the dimensioning of a ROBA-ES-coupling (see Dimensioning page 14).

Agent ResistanceThe elastomeric elements are very resistant against: pure mineral oils (lubricating oils) and anhydrous greases.They have a similar resistance against fuels such as regular-grade petroleum diesel oil kerosene.Damage may occur after longer exposure to alcohols or aromatic fuels (super/four star petrol).

The elastomeric element material used is resistant to hydrolysis. In contrast to other polyurethane materials, water (including seawater) causes, even after years of exposure, no particular changes to the mechanical characteristics. Hot water, however, reduces the mechanical strength.

For information on contact with special agents or radiation, please contact the manufacturers.

DimensioningThe characteristics of ROBA-ES couplings can be greatly varied by using different elastomeric elements. Due to different damping characteristics and the non-linear rigidity of the elastomer, this element also offers more parameters than the steel shaft connection, which should be taken into account on selection.

We therefore recommend careful, thorough coupling dimensioning (see Dimensioning page 14).

Elastomeric elementhardness[Shore]

Colour

Permitted temperature range

Permanent temperature Temporary max. temperature

80 Sh A Blue -50 to +80 C -60 to +120 C

92 Sh A Yellow -40 to +90 C -50 to +120 C

98 Sh A Red -30 to +90 C -40 to +120 C

64 Sh D Green -30 to +100 C -40 to +140 C

Please Observe:According to German notation, decimal points in this document are represented with a comma (e.g. 0,5 instead of 0.5).

We reserve the right to make dimensional and constructional alterations.4

ROBA-ES elastomeric elements

Size

Torque Type 940._ _ _._ 1)

Elast. element hardness 80 Sh A (blue)

Elast. element hardness9 Sh A (yellow)

Elast. element hardness98 Sh A (red)

Elast. element hardness64 Sh D (green)

TKN )

[Nm]TK max[Nm]

TKN )

[Nm]TK max[Nm]

TKN )

[Nm]TK max[Nm]

TKN )

[Nm]TK max[Nm]

14 4 8 8 16 13 26 16 3219 5 10 10 20 17 34 21 424 17 34 35 70 60 120 75 1508 46 92 95 190 160 320 200 40038 - - 190 380 325 650 405 8104 - - 265 530 450 900 560 112048 - - 310 620 525 1050 655 131055 - - 410 820 685 1370 825 165065 - - 900 1800 1040 2080 - -

Only available on P-design (page 9)14-3 4 8 8 16 13 26 16 32

19-37,5 4 8 8 16 14 28 17 344-50 12 24 25 50 43 86 54 108

Torques

Permitted Misalignment Values

Spring Rigidity

1) The permitted max. torque for Types 940._00._ and 940._11._ is dependent on bore diameter d3/d4, see Tables 1 to 4, pages 10 and 11.2) For permitted alternating torques, see Coupling Dimensioning page 14.

Size

Shaft misalignments

Axial Radial Angular

DKa80/9/98 Sh A

64 Sh D

DKr80 Sh A

DKr9 Sh A

DKr98 Sh A

DKr64 Sh D

a80 Sh A

a9 Sh A

a98 Sh A

a64 Sh D

[mm] [mm] [mm] [mm] [mm] mm] [mm] [mm] [mm]

14 1,0 0,21 0,15 0,09 0,06 1,1 1,0 0,9 0,819 1,2 0,15 0,1 0,06 0,04 1,1 1,0 0,9 0,84 1,4 0,18 0,14 0,1 0,07 1,1 1,0 0,9 0,88 1,5 0,2 0,15 0,11 0,08 1,3 1,0 0,9 0,838 1,8 - 0,17 0,12 0,09 - 1,0 0,9 0,84 2,0 - 0,19 0,14 0,1 - 1,0 0,9 0,848 2,1 - 0,21 0,16 0,11 - 1,0 0,9 0,855 2,2 - 0,24 0,17 0,12 - 1,0 0,9 0,865 2,6 - 0,25 0,18 - - 1,0 0,9 -

Only available on P-design (page 9)14-3 1,0 0,21 0,15 0,09 0,06 1,1 1,0 0,9 0,8

19-37,5 1,2 0,15 0,1 0,06 0,04 1,1 1,0 0,9 0,84-50 1,4 0,18 0,14 0,1 0,07 1,1 1,0 0,9 0,8

Size

Static torsional spring rigidity Dynamic torsional spring rigidity Static radial spring rigidity

CT stat.80 Sh A

CT stat.9 Sh A

CT stat.98 Sh A

CT stat.64 Sh D

CT dyn.80 Sh A

CT dyn.9 Sh A

CT dyn.98 Sh A

CT dyn.64 Sh D

Cr80 Sh A

Cr9 Sh A

Cr98 Sh A

Cr64 Sh D

[Nm/rad.] [Nm/rad.] [Nm/rad.] [Nm/rad.] [Nm/rad.] [Nm/rad.] [Nm/rad.] [Nm/rad.] [N/mm] [N/mm] [N/mm] [N/mm]

14 50 80 120 230 120 240 300 730 180 300 470 96019 350 820 900 1400 1050 1800 2200 4200 700 1200 2100 27004 820 2300 3700 4500 1300 4800 7600 10800 800 1900 2800 42008 1300 3800 4200 7000 2200 6800 10100 17200 950 2100 3500 490038 - 5600 7400 9000 - 11900 19900 30500 - 2900 4800 56004 - 9800 13800 15000 - 20500 31100 64900 - 4100 5400 690048 - 12000 15100 28500 - 22800 44900 102800 - 4500 6200 820055 AVAILABLE ON REQUEST AVAILABLE ON REQUEST AVAILABLE ON REQUEST65

Only available on P-design (page 9)14-3 50 80 120 230 120 240 300 730 180 300 470 960

19-37,5 280 660 720 1120 840 1440 1760 3360 560 960 1680 21604-50 600 1700 2700 3300 1000 3600 5700 8100 600 1500 2100 3200 5

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Fig. 1: Type 940._22._

ROBA-ES with keyways Type 940._._ Sizes 14 to 65

Dimensi-ons

Size )

14 19 4 8 38 4 48 55 65

a 2 4 4 5 5 5 5 9 8

b 10 12 14 15 18 20 21 22 26

D - - - - - 75 - - -

DH 30 40 55 65 80 95 105 120 135

dH 10,5 18 27 30 38 46 51 60 68

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