accouplement mec

®

Backlash-freeMetal Bellow Couplings

GERWAH -Products • You can rely on them.

The company

Our company was established in1981.

The GERWAH-Group has beenexpanding continuously since itsestablishment and is represented inapproximately 25 countries.

We are constantly market-orientedand conformed to the permantentchanges in the economic require-ments. Nevertheless, we are able tofind the optimum solution and givethe most suitable support to ourcustomers for their specific applica-tions.

Due to our ideas of innovative pro-ducts, we have become one of thesignificant business partners in themechanical engineering industry.

We are a supplier of high-qualityproducts. Technical competenceand know-how, advice and servicesare the pillar of our company andrepresent the basis for our success-ful and professional co-operatingwith our customers, who are thefocus of our activities.

The structure of our organisationenables us to offer highly technicalsolutions on the one hand, and awide range of standard productson the other hand.

The ideal location of our companynearby the Rhein Main Airport inFrankfurt guarantees our clientsthroughout the world that theirdeliveries will be dispatched punc-tually.

Utilise our experience and know-how in motive power engineeringand do include us in your planningstage. The special quality and moti-vation provided by our engineerswill prevent you from wasting a lotof time and expenses.

We enjoy presenting solutions. Ouraim is nothing but your satisfaction.Speak to us.

Main

Frankfurt

Würzburg

Gießen Kassel

Stuttgart

München

Exit Stockstadt

Großwallstadt

Exit Rohrbrunn

A 3

A 45

B 469

A 7

A 81

4

Product information / Design

Metal bellows couplings

• Backlash-free transmission oftorque

• High torsional stiffness, precisionof transmission of rotational angle

• Different torsional stiffness

• Backlash-free shaft connection

• Small dimensions, low moment ofinertia

• Compensation for radial, axial,and angular misalignment

• Free of wear, maintenance-free,no standstill period

• Not sensitive to temperatures bet-ween -30 °C and +100 °C, highertemperature ranges available ondemand

• Simple and operationally safeassembly

• Economical and user-friendly dueto modular system

• Nominal moments between0.4 - 5000 Nm

Backlash-free, torsionally stiff metalbellows couplings are ready toinstall when delivered. The metalbellows are made of anti-corrosivesteel, all other parts are manufac-tured from aluminum or steel andpartly have an environmental fri-endly protective coating.

As a standard, the boreholes areequipped with a fitting in accordan-ce with ISO-H7. For the shafts, werecommend an transition, e.g.H7/g6. When selecting other shaftfitting, the fitting should not exceeda maximum of 0.03 mm.

The power transmission betweenthe coupling hub and the shaftoccurs through compression andfriction between the contact sur-faces. Special attention must be paidto the tightening torque of the re-taining screws as well as the perfectcondition of the contact surfaces.

The contact surfaces must be freeof oil and grease. Types with akeyway are available. The torquesindicated in the lists of TechnicalData can only be safely transferredif these points are complied with.Otherwise it would be necessary tomake compromises.

Typical characteristics of metal bellows couplings

The dimensioning in accordance with the torque

Metal bellows couplings are gene-rally designed according to thenominal torque stated in the lists ofthe Technical Data below. Thenominal torque must always be hig-her than the regularly transferredtorque. This generally applies to theuse of servo motors, whose accele-

ration moment in positive andnegative directions is much higherthan the nominal moment.

The use of metal bellows couplingswhich are put in controlled, highdynamic drives, the followingdimensioning values have proven tobe reliable in practice:

K = 1,5 for evenly shapedmovements

K = 2 for unevenly shapedmovements

K = 2,5 – 4 for jerky movements

For Servo drives within tool makingmachines, the values for K of 1.5-2should be used.

In general, the following relationships apply:

TKN ≥ K x TAS x = [Nm]JMach

JMot + JMach

5


Design

Design with consideration for dyna-mic torsional stiffness.

Although metal bellows couplingsare backlash-free and torsion-rigid,it should not be overlocked thatthey link two rotating masses. Indisadvantageous cases like torsionsprings the couplings can effect ahigh stiffness. The hunting of thedrives and the harmonic oscillationin the armature current of themotor, e.g. thyristor industrial driveswith low pulse number must there-fore never be within the range ofthe mechanical resonance frequency.

In practice the resonance frequency“fres” must be twice as large as theexcitation frequency of the drive.

For most normal drives, e.g. NC-machine tool, this will be between150 and 350 Hz.

In the development of metal bellowscouplings this factor was given spe-cial consideration. The dynamic tor-sional stiffness CT dyn was selected so

that it would not be within therange of clearance diameter frommost applications. Various levels oftorsional stiffness are available asstandard versions.

We would be pleased to designyour metal bellows couplings foryou. Feel free to use our experienceand know-how for your success.

Speak to us.

Sample calculation

Application of a metal bellows coupling in a machine tool drive Drive related data

Servo motor 1 FT 5104

Maximum torque TAS = 160 NmMoment of inertiaJMot = 18.3 x 10-3 kgm2

Output-data

Machine tool

Moment of inertia of ball screw andslide JMach = 17 x 10-3 kgm2

fres = CT dyn x = [Hz]JMot +JMach

JMot x JMach

12π

TKN ≥ K x TAS x = 2 x 160 Nm x = 154 NmJMach

JMot + JMach

17 x 10-3 Kgm2

(18,3 + 17) x 10-3 Kgm2

fres = x CT dyn x = x 116000 Nm/rad x = 578 HzJMot + JMach

JMot x JMach

0,0183 + 0,017 Kgm2

0,0183 x 0,017 Kgm2

12π

12π

Servo motor

Metall bellows coupling

Slide

Ball screw

Coupling selection: AKD 200, TKN = 200 Nm, CT dyn = 116 x 103 Nm/rad.

The metal bellows coupling is sufficiently dimensioned, since 200 Nm ≥ 154 Nm.

Design according to resonance frequency:

Design according to torque:

The arithmetic calculation is clearly much higher than the expected resonance frequency.

The low moment of inertia of the metal bellows coupling is disregarded. K = Load factor, impulse factorselected for this drive K = 2

6


Summary of type series

To connect two shafts, backlash-free shaft-hub connection usingcollet clamps. For torques between0.10 – 10 Nm.

Technical dataand dimensions

To connect two shafts, backlash-free shaft-hub connection using acollet clamp and an expandingclamp. For torques between 0.40 – 10 Nm.


To connect two shafts, backlash-free shaft-hub connection using set screws. For torques between 0.10 – 10 Nm.


To connect two shafts, backlash-free shaft-hub connection usingconical hubs. For torques between30 – 5000 Nm.


To connect two shafts, backlash-free shaft-hub connection usingcollet clamps. For torques between0.40 – 10 Nm.


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Series DK – miniature

Series DKN – miniature

Series DK/S – miniature

Series EK – miniature

Series AK

Discountinued model

Inner conical hub

7


Summary of type series

To connect two shafts, backlashfree shaft-hub connection usingouter conical hubs, contracting disc,no releasing screw required, releaseduring dismantling. For torquesbetween 18 – 5000 Nm.


Same as Series AKD but with shor-ter length and higher torsionalstiffness. For torques between18 – 500 Nm.


Variable installation element formounting of hubs, flanged shafts,flanges, etc. For torques between18 – 5000 Nm.


Appropriate coupling for Fanuc ACmotors. Shorter installation modelsavailable. For torques between18 – 60 Nm.


User-friendly solutions

To connect two shafts, backlashfree shaft-hub connection usingcollet clamps. For torquesbetween 18 – 500 Nm.


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Series AK/SB

Series AKD

Series AKN

Series CK

Series AKD-Fanuc

Outer conical hub

8

Series DK – miniature (discontinued model)


DK 20/47 6.35H7

D1

Length (L)

10H7––Type

D2

Ordering data

��

��

L±1

C

F= =

ø B ø A

ø D2

H7

ø D1

H7

D3

KG (DIN 912)

Keyway according to DIN 68851) on demand

Technical Data, Dimensions

(DIN 84)

Angular misalignment:1.2° to 2°, depending on length

Hub bores:Standard quality of fitting H7.Custom bores on demand.

Standard bores:DK 1 Ø 03H7DK 4-15 Ø 06H7DK 20 Ø 06H7 und 10H7DK 45-100 Ø 10H7

Tooling materials:Hubs made of anodized aluminum, metalbellows made of stainless steel.Stainless steel version also available.

1) Tolerance of keyway: Standard JS9.

XX–

Further details,e.g. special material, keyway

TYPE DIMENSIONS (mm) TECHNICAL DATA

Ø A Ø B C L F D1/D2 D3 G K Nominal- Misalignment Torsio- Moment Weight(±1) (H7) Clear- (DIN 912) torque (mm) nal of

from/to ance 8.8 stiffness inertiadia- TKN radial axial CT dyn J m

meter (Nm) �Kr �Ka (Nm/rad) (g cm2) (g)

DK 1/25 10 10 7 25 4.5 1 – 4 11 M1.6 3.4 0.1 0.12 0.2 65 0.7 5

DK 4/26 15.5 15 9 26 5.7 3 – 6.5 17.5 M2 5.6 0.4 0.1 0.2 254 2.6 9

DK 4/29 15.5 15 9 29 5.7 3 – 6.5 17.5 M2 5.6 0.4 0.15 0.3 190 2.6 9

DK 4/32 15.5 15 9 32 5.7 3 – 6.5 17.5 M2 5.6 0.4 0.2 0.4 152 2.6 9

DK 9/28 15.5 15 9 28 5.7 3 – 6.5 17.5 M2 5.6 0.9 0.1 0.2 507 2.6 9

DK 9/31 15.5 15 9 31 5.7 3 – 6.5 17.5 M2 5.6 0.9 0.15 0.3 380 2.9 10

DK 9/35 15.5 15 9 35 5.7 3 – 6.5 17.5 M2 5.6 0.9 0.2 0.4 305 3.2 11

DK15/33 20 19 12 33 7 3 – 10 21 M2.5 7 1.5 0.1 0.25 748 11 22

DK 15/37 20 19 12 37 7 3 – 10 21 M2.5 7 1.5 0.15 0.4 701 12 24

DK 20/37 25 24 13 37 8 3 – 12 27 M3 9 2 0.1 0.3 1530 25 36

DK 20/43 25 24 13 43 8 3 – 12 27 M3 9 2 0.2 0.4 1290 27 38

DK 20/47 25 24 13 47 8 3 – 12 27 M3 9 2 0.25 0.5 1030 28 40

DK 45/47 32 32 15.5 47 10 6 – 16 34 M4 11.5 4.5 0.1 0.3 6450 98 74

DK 45/55 32 32 15.5 55 10 6 – 16 34 M4 11.5 4.5 0.2 0.5 4030 103 78

DK 100/53 40 40 17 53 10 6 – 19 41.5 M4 15.5 10 0.15 0.4 8070 231 120

DK 100/64 40 40 17 64 10 6 – 19 41.5 M4 15.5 10 0.25 0.5 6720 250 130

9

Series DKN – miniature




Ø A Ø B C L I D1/D2 D3 G K Nominal- Misalignment Torsio- Moment Weight(±1) (H7) Clear- (DIN 912) torque (mm) nal of

from/to ance 8.8 stiffness inertiadia- TKN radial axial CT dyn J m


DKN 4/21 15.5 15 7 21 2.4 3 – 6.5 17.5 M2 5.6 0.4 0.1 0.2 254 2.6 9

DKN 4/24 15.5 15 7 24 2.4 3 – 6.5 17.5 M2 5.6 0.4 0.15 0.3 190 2.6 9

DKN 4/28 15.5 15 7 27 2.4 3 – 6.5 17.5 M2 5.6 0.4 0.2 0.4 152 2.6 9

DKN 9/23 15.5 15 7 23 2.4 3 – 6.5 17.5 M2 5.6 0.9 0.1 0.2 507 2.6 9

DKN 9/26 15.5 15 7 26 2.4 3 – 6.5 17.5 M2 5.6 0.9 0.15 0.3 380 2.9 10

DKN 9/30 15.5 15 7 30 2.4 3 – 6.5 17.5 M2 5.6 0.9 0.2 0.4 305 3.2 11

DKN 15/26 20 19 9 26 3 3 – 10 21 M2.5 7 1.5 0.1 0.25 748 11 22

DKN 15/30 20 19 9 30 3 3 – 10 21 M2.5 7 1.5 0.15 0.4 701 12 24

DKN 20/32 25 24 12 32 3.5 3 – 12 27 M3 9 2 0.1 0.3 1530 25 36

DKN 20/38 25 24 12 38 3.5 3 – 12 27 M3 9 2 0.2 0.4 1290 27 38

DKN 20/42 25 24 12 42 3.5 3 – 12 27 M3 9 2 0.25 0.5 1030 28 40

DKN 45/41 32.5 32 14 41 4.5 6 – 16 34 M4 11.5 4.5 0.1 0.3 6450 98 74

DKN 45/50 32.5 32 14 50 4.5 6 – 16 34 M4 11.5 4.5 0.2 0.5 4030 103 78

DKN 100/47 40.5 40 14.5 47 5 6 – 19 41.5 M4 15.5 10 0.15 0.4 8070 231 120

DKN 100/57 40.5 40 14.5 57 5 6 – 19 41.5 M4 15.5 10 0.25 0.5 6720 250 130



Standard bores:DKN 4-15 Ø 06H7DKN 20 Ø 06H7 und 10H7DKN 45-100 Ø 10H7

Tooling materials:Hubs made of anodized aluminum, metalbellows made of stainless steel.

��

��

L±1

C

I

ø B ø A

ø D2

H7

ø D1

H7

D3

KG (DIN 912)


DKN 20/42 6.35H7

D1

Length (L)

10H7––Type

D2

Ordering data

XX–


1) Tolerance of keyway: Standard JS9.

10

Series DK/S – miniature




Hub bores:D2: We recommend an H8 fitting for theshare bore.

Standard bores:DK/S 4-15 D1 = 06H7DK/S 20 D1 = 06H7 und 10H7DK/S 45-100 D1 = 10H7

Tooling materials:Hubs made of anodized aluminum, DK/S 4-9expanding hubs made of brass, DK/15-100expanding hubs made of steel, metal bellowsmade of stainless steel.Stainless steel version also available.

1) Tolerance of keyway: Standard JS9

DK/S 20/41

D1

Length (L)

10H7–Type

Ordering data

��

��

��

L±1

C

F

J

ø B

ø A

ø D2

f7

ø D1

H7

D3

KG (DIN 912)G1 (DIN 912)= =


XX–



Ø A Ø B C L F D1 D2 J D3 G K G1 Nominal- Misalignment Torsio- Moment Weight(±1) (H7) (f7) Clear- (DIN (DIN torque (mm) nal of

from/to ance 912) 912) stiffness inertiadia- TKN radial axial CT dyn J m


DK/S 4/29 15.5 15 9 29 5.7 3 – 6.5 8 8 17.5 M2 5.6 M3 0.4 0.1 0.2 254 3.0 10.9

DK/S 4/31 15.5 15 9 31 5.7 3 – 6.5 8 8 17.5 M2 5.6 M3 0.4 0.15 0.3 190 3.0 11.3

DK/S 4/35 15.5 15 9 35 5.7 3 – 6.5 8 8 17.5 M2 5.6 M3 0.4 0.2 0.4 152 3.0 11.4

DK/S 9/30 15.5 15 9 30 5.7 3 – 6.5 8 8 17.5 M2 5.6 M3 0.9 0.1 0.2 507 3.0 11.8

DK/S 9/33 15.5 15 9 33 5.7 3 – 6.5 8 8 17.5 M2 5.6 M3 0.9 0.15 0.3 380 3.0 12.7

DK/S 9/37 15.5 15 9 37 5.7 3 – 6.5 8 8 17.5 M2 5.6 M3 0.9 0.2 0.4 305 3.0 12.9

DK/S 15/37 20 19 12 37 7 3 – 10 10 12 21 M2.5 7 M4 1.5 0.1 0.25 748 11 23.6

DK/S 15/41 20 19 12 41 7 3 – 10 10 12 21 M2.5 7 M4 1.5 0.15 0.4 701 12 25.0

DK/S 20/41 25 24 13 41 8 3 – 12 10 12 27 M3 9 M4 2.0 0.1 0.3 1530 21 37.8

DK/S 20/47 25 24 13 47 8 3 – 12 10 12 27 M3 9 M4 2.0 0.2 0.4 1290 23 41.4

DK/S 20/51 25 24 13 51 8 3 – 12 10 12 27 M3 9 M4 2.0 0.25 0.5 1030 25 41.7

DK/S 45/52 32 32 16 52 10 6 – 16 14 16 34 M4 11.5 M5 4.5 0.1 0.3 6450 80 83.4

DK/S 45/61 32 32 16 61 10 6 – 16 14 16 34 M4 11.5 M5 4.5 0.2 0.5 4030 86 89.6

DK/S 100/61 40 40 16 61 10 6 – 19 16 20 41.5 M4 15.5 M6 10 0.15 0.4 8070 224 129.8

DK/S 100/71 40 40 16 71 10 6 – 19 16 20 41.5 M4 15.5 M6 10 0.25 0.5 6720 256 146.7

11

Series EK – miniature


��

L±1

C

ø B ø A

ø D2

H7

ø D1

H7

120°

G (DIN 916)I


EK 20/23 6.35H7

D1

Length (L)

10H7– ––Type

D2

Ordering data



Ø A Ø B C L D1/D2 G I Nominal- Misalignment Torsio- Moment Weight(±1) (H7) (DIN 916) (mm) torque (mm) nal of

from/to stiffness inertiaTKN radial axial CT dyn J m

(Nm) �Kr �Ka (Nm/rad) (g cm2) (g)

EK 1/22 10 10 6 22 1 – 4 M3 2 0.1 0.12 0.2 65 0.7 5

EK 4/20 13 15 6 20 3 – 8 M3 2 0.4 0.1 0.2 254 2.0 6

EK 4/23 13 15 6 23 3 – 8 M3 2 0.4 0.15 0.3 190 2.0 6

EK 4/26 13 15 6 26 3 – 8 M3 2 0.4 0.2 0.4 152 2.0 6

EK 9/21 13 15 6 21 3 – 8 M3 2 0.9 0.1 0.2 507 2.0 6

EK 9/25 13 15 6 25 3 – 8 M3 2 0.9 0.15 0.3 380 2.3 7

EK 9/28 13 15 6 28 3 – 8 M3 2 0.9 0.2 0.4 305 2.6 8

EK 15/25 19 19 12 25 3 – 10 2 x M4 3 1.5 0.1 0.25 748 7.5 17

EK 15/30 19 19 12 30 3 – 10 2 x M4 3 1.5 0.15 0.4 701 8 19

EK 20/23 21 24 12 23 3 – 12 2 x M4 3 2 0.1 0.3 1530 14 22

EK 20/29 21 24 12 29 3 – 12 2 x M4 3 2 0.2 0.4 1290 16 24

EK 20/33 21 24 12 33 3 – 12 2 x M4 3 2 0.25 0.5 1030 17 26

EK 45/39 29 32 16 39 6 – 15 2 x M6 4 4.5 0.1 0.3 6450 68 54

EK 45/48 29 32 16 48 6 – 15 2 x M6 4 4.5 0.2 0.5 4030 73 58

EK 100/44 36 40 20 44 6 – 19 2 x M6 4 10 0.15 0.4 8070 200 104

EK 100/54 36 40 20 54 6 – 19 2 x M6 4 10 0.25 0.5 6720 220 114



Standard bores:EK 1 Ø 03H7EK 4-15 Ø 06H7EK 20 Ø 06H7 und 10H7EK 45-100 Ø 10H7

Tooling materials:Hubs made of anodized aluminum, metalbellows made of stainless steel.Stainless steel version also available.

1) Tolerance of keyway: Standard JS9

XX


12

Series AK with conical hubs

Metal bellows couplingsMetal bellows couplings

��

I (DIN 933)L±2

HGF

ø A ø B

ø D2

H7

ø D1

H7

1)

AK 150/80 30H7

Bore diameter D2

Bore diameter D1

35H7– XX––

Length (L)

Type

Further details,e.g. special material 3)

Ordering data

Dimensions (mm) – Series AK

TYPE 30 60 80 150 200 300 500 800 1400 3000 5000

L±2 52 / 60 63 / 73 80 / 91 80 / 92 80 / 93 91 / 104 113 170 170 206 206

Ø A 56 66 82 82 90 110 122 157 157 157 208

Ø B 52 63 80 80 85 110 122 152 152 152 190

Ø D1H7 / Ø D2H7

- min. 12 15 20 20 20 25 35 50 50 55 60- max. 20 25 35 35 40 50 55 702) 702) 752) 852)

F 45 / 53 55 / 65 72 / 83 72 / 84 72 / 85 80 / 93 102 150 150 190 186

G 29 / 37 37 / 47 50 / 61 50 / 62 50 / 63 54 / 67 72 110 110 150 146

H 16/24 21/31 24/36 24/36 25/37 29/40 40 84 84 84 94

I (DIN 933) 6 x M5 6 x M6 6 x M6 6 x M6 6 x M6 6 x M8 6 x M8 6 x M16 6 x M16 6 x M12 6 x M16

Technical Data – Series AK

TYPE 30 60 80 150 200 300 500 800 1400 3000 5000

Nominal moment (Nm) TKN 30 60 80 150 200 300 500 800 1400 3000 5000

Torsional stiffness (103 Nm/rad) CT dyn 36 / 26 73 / 49 126 / 74 151 / 101 173 / 116 499 / 280 310 758 1266 2800 4800

Radial spring (N/mm) Cr 718 / 222 1125 / 333 1218 / 403 2030 / 601 2531/ 450 6328 /1470 972 512 706 2950 4920

Axial spring (N/mm) Ca 48 / 27 91 / 53 84 / 53 147 / 86 147 / 85 284 /153 86 186 278 310 510

Moment of inertia (10-3 Kgm2) J 0.15 0.4 0.8 0.8 1.5 4.0 7.2 26.1 26.1 48 62

Tightening torque of retaining screws (Nm) MA 4.5 8.5 10 14 14 18 26 45 80 85 210

Weight (ca. kg) m 0.4 0.8 1.3 1.3 1.6 3.4 4.2 8.5 8.5 15 21

Max. approved misalignment- radial (mm) �Kr 0.1 / 0.2 0.1 / 0.2 0.2 / 0.2 0.2 / 0.2 0.2 / 0.2 0.2 / 0.2 0.2 0.2 0.2 0.2 0.2- axial (mm) �Ka 0.4 / 0.5 0.4 / 0.5 0.4 / 0.5 0.4 / 0.5 0.4 / 0.5 0.4 / 0.5 1.0 1.0 1.0 1.0 1.0- angular (degree) �Kw 1.0 / 1.5 1.0 / 1.5 1.0 / 1.5 1.0 / 1.5 1.0 / 1.5 1.0 / 1.5 1.5 1.5 1.5 1.5 1.5

Max. rotating speed atV = 30 m/s (rpm) nmax 11000 9100 7000 7000 6700 5200 4600 3700 3700 2800 2800

1) Keep space for the releasing screws. 2) Larger bores on request. 3) Stainless steel version also available.

13

Series AK/SB with outer conical hubs – release during dismantling


��

��

I (DIN 933)L±2

HGF

ø A ø B

ø D2

H7

ø D1

H7

1)

Dimensions (mm) – Series AK/SB

TYPE 18 30 60 150 200 300 500 800 1400 3000 5000

L±2 65 / 73 60 / 68 80 / 90 98 /110 98 /110 111/122 135 180 180 220 245

Ø A 45 56 66 82 90 110 122 157 157 157 208

Ø B 45 52 65 80 85 110 122 152 152 152 190

Ø D1H7 / Ø D2H7

- min. 09 12 15 20 20 25 35 50 50 55 60- max. 15 20 32 35 42 50 55 70 70 75 85

F 58 / 66 53 / 61 73 / 83 90 /102 90 /102 100 /111 124 164 164 204 225

G 38 / 46 31 /39 37 / 47 50 / 62 51 / 63 56 / 67 72 110 110 146 146

H 24 / 32 16 / 24 21 / 31 24 / 36 25 / 37 29 / 40 40 84 84 84 94

I (DIN 933) 4 x M5 6 x M5 6 x M5 6 x M6 6 x M6 6 x M8 6 x M8 6 x M12 6 x M12 6 x M12 6 x M16

Technical Data – Series AK/SB

TYPE 18 30 60 150 200 300 500 800 1400 3000 5000

Nominal moment (Nm) TKN 18 30 60 150 200 300 500 800 1400 3000 5000

Torsional stiffness (103 Nm/rad) CT dyn 8 /6 36 / 26 73 / 49 151/101 173 / 116 499 / 280 310 758 1266 2800 4800

Radial spring (N/mm) Cr 204 / 86 718 / 222 1125 / 333 2030 / 601 2531 / 450 6328 /1470 972 512 706 2950 4920

Axial spring (N/mm) Ca 52 /39 48 / 27 91/ 53 147 / 86 147 / 85 284 /153 86 186 278 310 510

Moment of inertia (10-3 Kgm2) J 0.1 0.15 0.4 0.8 1.5 4 14 48 48 54 136

Tightening torque of retaining screws (Nm) MA 5.9 5.9 8.7 15 15 25 36 85 115 125 210

Weight (ca. kg) m 0.3 0.4 0.8 1.3 1.6 3.4 4 7.5 7.5 16 27

Max. approved misalignment- radial (mm) �Kr 0.1 / 0.2 0.1 / 0.2 0.1 / 0.2 0.2 / 0.2 0.2 / 0.2 0.2 / 0.2 0.2 0.2 0.2 0.2 0.2- axial (mm) �Ka 0.4 / 0.5 0.4 / 0.5 0.4 / 0.5 0.4 / 0.5 0.4 / 0.5 0.4 / 0.5 1.0 1.0 1.0 1.0 1.0- angular (degree) �Kw 1.0 / 1.5 1.0 / 1.5 1.0 / 1.5 1.0 / 1.5 1.0 / 1.5 1.0 / 1.5 1.5 1.5 1.5 1.5 1.5

Max. rotating speed atV = 30 m/s (rpm) nmax 12700 1100 9100 7000 6700 5200 4600 3700 3700 2800 2800

1) Keep space for the releasing screws. 2) Stainless steel version also available.

AK/SB 150/98 30H7

Bore diameter D2

Bore diameter D1

35H7– XX––

Length (L)

Type

Further details,e.g. special material 2)

Ordering data

14

Series AKD with collet clamp


��

��

��

L±2

ø A Hø B

ø D2

H7

ø D1

H7

C

F

KI (DIN 912)


Technical Data – Series AKD

TYPE 18 30 60 80 150 200 300 500

Nominal moment (Nm) TKN 18 30 60 80 150 200 300 500

Torsional stiffness (103 Nm/rad) CT dyn 6 26 49 74 101 116 280 310

Radial spring (N/mm) Cr 86 222 333 403 601 450 1470 972

Axial spring (N/mm) Ca 39 27 53 53 86 85 153 86

Moment of inertia (10-3 Kgm2) J 0.08 0.1 / 0.16 0.3 / 0.5 1.4 / 2.3 / 2.8 1.4 / 2.3 / 2.8 2.6 / 4.2 4.6 / 6.2 9

Tightening torque of retaining screws (Nm) MA 6 / 6 15 / 12 40 / 30 60 / 55 / 50 80 / 70 / 50 100 / 80 110 / 90 145

Weight (ca. kg) m 0.2 0.2 / 0.3 0.5 / 0.6 1.7 /2.1 /2.3 1.7 /2.1 /2.3 2.5 / 3.3 3.4 / 4.1 4.9

Max. approved misalignment- radial (mm) �Kr 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2- axial (mm) �Ka 0.5 0.5 0.5 0.5 0.5 0.5 0.5 1- angular (degree) �Kw 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5

Max. rotating speed atV = 30 m/s (rpm) nmax 12700 10200 8600 6800 6800 6300 5900 4900

AKD 150 30H7

Bore diameter D2

Bore diameter D1

35H7– XX––Type

Further details,e.g. special material, keyway 3)

Ordering data

Dimensions (mm) – Series AKD

TYPE 18 30 60 80 150 200 300 500

L±2 71 73 89 103 104 113 115 122

Ø A 45 56 66 82 82 90 110 112

Ø B 45 47 / 56 57 / 66 68 / 80 / 84 68 / 80 / 84 80 / 90 90 / 96 110

C 12 15 19.5 21.5 21.5 25.5 28 29.5

Ø D1H7 / Ø D2H7 2)- min. 10 / 20 10 / 20 14 / 23 20 / 28 / 35 20 / 28 / 35 25 / 32 32 / 40 40- max. 20 / 25 20 / 25 23 / 35 28 / 35 / 40 28 / 35 / 40 32 / 42 40 / 45 60

F 32 24 31 35 36 37 40 40

I M5 M6 M8 M10 M10 M12 M12 M12

K 17.5 16 / 20 20 / 24 24 / 27 / 28 24 / 27 / 28 26 / 31 32 / 35 40

H (parasitic disturbance) 48 56 70 84 84 93 102 108

Hubs 18 to 60 made of aluminum,Hubs 80 to 500 made of steel, othermaterials available on request.

1) Tolerance of keyway: Standard JS9. 2) Smaller Ø possible for lower torque oftransmission.

3) Stainless steel version also available.

15

Series AKN with retaining hub and increased torsional stiffness


��

��

��

L±2

ø A Hø B

ø D2

H7

ø D1

H7

C

F

KI (DIN 912)


AKN 150 30H7

Bore diameter D2

Bore diameter D1



Ordering data

Technical Data – Series AKN

TYPE 18 30 60 80 150 200 300 500

Nominal moment (Nm) TKN 18 30 60 80 150 200 300 500

Torsional stiffness (103 Nm/rad) CT dyn 8 36 73 126 151 173 499 680

Radial spring (N/mm) Cr 204 718 1125 1218 2030 2531 6328 8800

Axial spring (N/mm) Ca 52 48 91 84 147 147 284 105

Moment of inertia (10-3 Kgm2) J 0.08 0.1 / 0.16 0.3 / 0.5 1.4 /2.3 /2.8 1.4 /2.3 /2.8 2.6 / 4.2 4.6 / 6.2 9

Tightening torque of retaining screws (Nm) MA 6 / 6 15 / 12 40 / 30 60 / 55 / 50 80 / 70 / 50 100 / 80 110 / 90 145

Weight (ca. kg) m 0.2 0.2 / 0.3 0.5 / 0.6 1.7 /2.1 /2.3 1.7 /2.1 /2.3 2.5 / 3.3 3.4 / 4.1 4.8

Max. approved misalignment- radial (mm) �Kr 0.2 0.1 0.1 0.2 0.2 0.2 0.2 0.2- axial (mm) �Ka 0.5 0.4 0.4 0.4 0.4 0.4 0.4 0.5- angular (degree) �Kw 1.5 1.0 1.0 1.0 1.0 1.0 1.0 1.0

Max. rotating speed atV = 30 m/s (rpm) nmax 12700 10200 8600 6800 6800 6300 5900 4900

Dimensions (mm) – Series AKN

TYPE 18 30 60 80 150 200 300 500

L±2 63 65 78 91 91 100 102 110

Ø A 45 56 66 82 82 90 110 122

Ø B 45 47 / 56 57 / 66 68 / 80 / 84 68 / 80 / 84 80 / 90 90 / 96 110

C 12 15 19.5 21.5 21.5 25.5 28 29.5

Ø D1H7 / Ø D2H7

- min. 10 / 20 10 / 20 14 / 23 20 / 28 / 35 20 / 28 / 35 25 / 32 32 / 40 40- max. 20 / 25 20 / 25 23 / 35 28 / 35 / 40 28 / 35 / 40 32 / 42 40 / 45 60

F 24 16 20 24 24 24 27 28

I M5 M6 M8 M10 M10 M12 M12 M12

K 17.5 16 / 20 20 / 24 24 / 27 / 28 24 / 27 / 28 26 / 31 32 / 35 40

H (clearance diameter) 48 56 70 84 84 93 102 108

Hubs 18 to 60 made of aluminum,Hubs 80 to 500 made of steel, othermaterials available on request.

1) Tolerance of keyway: Standard JS9. 2) Smaller Ø possible for lower torque oftransmission.


16

Series CK for flange mounting


��

L±2ø

A

G

ø D1

H7

ø D2

H7

ø C±

0,15

ø B

F

CK 150/52 50H7

Bore diameter D2

Bore diameter D1



Ordering data

Length (L)

1) Other bore diameters available on request. 2) Stainless steel version also available.

Technical Data – Series CK

TYPE 18 30 60 80 150 200 300 500 800 1400 3000 5000

Nominal moment (Nm) TKN 18 30 60 80 150 200 300 500 800 1400 3000 5000

Torsional stiffness(103 Nm/rad) CT dyn 8 / 6 39 / 26 73 / 49 126 / 74 150 / 101 173 /116 499 / 280 310 758 1266 2800 4800

Radial spring (N/mm) Cr 204 / 86 718 / 222 1125 / 330 1218 / 403 2030 / 601 2531 / 450 6328/1470 972 512 706 2950 4920

Axial spring (N/mm) Ca 52 / 39 48 / 27 91 / 53 84 / 53 147/ 86 147/ 85 284 /153 86 186 278 310 510

Moment of inertia (10-3 Kgm2) J 0.05 0.09 0.3 0.67 0.84 1.48 3.75 5.1 10.6 10.6 10.6 62

Weight (ca. kg) m 0.2 /0.25 0.2 / 0.3 0.3 / 0.4 0.6 / 0.7 0.65 / 0.75 1.0 / 1.15 1.6 / 1.8 1.8 2.9 2.9 2.9 16

Max. approved misalignment- radial (mm) �Kr 0.2 0.1/ 0.2 0.1/ 0.2 0.2/ 0.2 0.2/ 0.2 0.2/ 0.2 0.2/ 0.2 0.2 0.2 0.2 0.2 0.2- axial (mm) �Ka 0.5 0.4/ 0.5 0.4/ 0.50 0.4/ 0.5 0.4/ 0.5 0.4 / 0.5 0.4/ 0.5 1.0 1.0 1.0 1.0 1.0- angular (degree) �Kw 1.5 1.0/ 1.5 1.0/ 1.5 1.0/ 1.5 1.0/ 1.5 1.0 / 1.5 1.0/ 1.5 1.5 1.5 1.5 1.5 1.5

Max. rotating speed atV = 30 m/s (rpm) nmax 13900 11000 9000 7100 7100 6600 5200 4600 3700 3700 3700 3000

Dimensions (mm) – Series CK

TYPE 18 30 60 80 150 200 300 500 800 1400 3000 5000

L±2 36 / 44 30 / 37 41 / 51 51 / 61 52 / 62 51 / 63 47 / 67 73 130 130 135 145

Ø A 45 56 66 82 82 90 110 122 157 157 157 208

Ø B 41 52 63 80 80 86 110 122 152 152 152 208

Ø C 31 37 46 62 62 62 80 94 110 110 110 130

Ø D1H7 / Ø D2H7 1) 22 28 38 50 50 50 65 70 85 85 85 100

F 24 / 32 16 / 24 21 / 31 24 / 35 24 / 36 24 / 37 28 / 41 41 87 87 84 94

G 6 x M5 6 x M5 6 x M6 6 x M6 6 x M6 6 x M6 6 x M8 6 x M8 6 x M16 6 x M16 6 x M16 6 x M16

Thread depth 6 7 10 13 13 13 13 16 18 18 22 25

17

Series AKD-Fanuc


��

��

G (DIN 933)

1:10

FL±1

ø B ø A

ø XF ø K

ø H±

1

ø DH

7

C N

M10 P=1,25

Series 30 – 60

Pfn. b = 5; t = 2,3

Series 18

��

��

G (DIN 933)

FL±1

ø B ø A

ø XF ø K

ø H±

1

ø DH

7

C N

1:10

M6 P=0,75

Pfn. b = 4; t = 1,5

AKD 18/54

Ø D

Length

18 H 7– XFII–Type

Taper type

Ordering data

1) Other motor types on demand. 2) Keyway according to DIN 68851) alternati-vely on demand.


Technical Data – Series AKD-Fanuc

TYPE 18/54 … XF11 18/62 … XF11 30/70 … XF16 30/78 … XF16 60/78 … XF16 60/89 … XF16

Ø A 45 45 56 56 66 66

Ø B 45 45 56 56 66 66

C from/to 12 12 15 15 19 19

Ø DH7 2) from/to 10 – 20 10 – 20 14 – 25 14 – 25 14 – 28 14 – 28

L 54 62 70 78 78 89

F 24 32 16 24 20 31

N 16 16 29 29 29 29

Ø H 31 31 37 37 46 46

G (DIN 912) M5 M5 M6 M6 M8 M8

Ø K 45 45 52 52 63 63

XF 11 11 16 16 16 16

Nominal moment (Nm) TKN 18 18 30 30 60 60

Moment of inertia (kg cm2) J 0.75 0.75 2.35 2.35 4.85 4.85

Weight (Kg) m 0.25 0.25 0.5 0.5 0.75 0.75

Torsional stiffness (Nm/rad) CT dyn 7.5 x 103 5.5 x 103 36 x 103 26 x 103 73 x 103 49 x 103

Max. approved misalignment- radial (mm) �Kr 0.1 0.2 0.1 0.2 0.1 0.2- axial (mm) �Ka 0.4 0.5 0.4 0.5 0.4 0.5- angular (degree) �Kw 1 1.5 1 1.5 1 1.5

Max. rotating speed atV = 30 m/s (rpm) nmax 13900 13900 11000 11000 9000 9000

Selection table – Series AKD-Fanuc

Motortyp 1) Fanuc Model 2-OS Model 1-OS Model OS Model 5S Model OL Model 5L Model 6L

Coupling type AKD18/54XF11 AKD18/62XF11 AKD30/78XF16 AKD60/89XF16 AKD30/70XF16 AKD30/70XF16 AKD60/78XF16

Bores D1 (mm) from/to 10 – 20 10 – 20 14 – 25 14 – 28 14 – 25 14 – 25 14 – 25

MRAT-T 1 2 2.9 6 2.9 5.9 8.8

MMAX-T 7.8 16 26 53 11.8 24 47

XX–


18

Sample applications


Variable Series

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��

��

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Series AK/AKDModel with collet clamp and inner conical hub

Series AKN/SModel with collet and expanding clamps

��

Series CKWith special flange

Series DKNApplication – Linear actuator

Series AKApplication – Gantry robot

Series AKNApplication – servo-drive / milling machine

Series AKD/AK/SBModel with collet clamp and outer conical hub

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��

��

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Series AKN-XXModel with special hub on both sides

Series AKD/CKModel with collet clamp and flange

19

Assembly instructions


Assembly

Clean shaft ends and bores in hubs,degrease and check the tolerances.

Insert both shaft trunks into thehubs of the metal bellows coupling,and firmly tighten the screws, afterexamining the axial installationdimensions.

The tightening torque of the screwsand the maximum approved misa-lignment should not be exceeded(refer to list of Technical Data).

Alignment

Figure 10 illustrates the individualtypes of misalignment.

The fitted metal bellows couplingmust now be aligned. Please checkthe values indicated in the lists ofTechnical Data.

If several types of misalignmentappear simultaneously, then each ofthe individual values should not beexceeded. Moreover, they shouldbe aligned.

The total of the real misalignments inpercentage of the maximum valueshould not exceed 100%. Figure 9shows how to regulate.

The more precise the alignment, themore reserves are available to handleadditional misalignments for opera-tion. This will have an advantageous

effect on the service life, balancequality, and the accuracy of trans-mission.

If several types of misalignmentoccur at once, then the values mustbe lower than each of the maxi-mum values.

Dismantling

After loosening the backlash-freeshaft-hub connections, the drivecan be pulled apart and the metalbellows coupling can be removed.

Conical bushings for Series AK areforced off with a hexagonal socketscrew.

Please ask for our detailed assemblyinstructions.

∆Ka axial misalignment (%)

∆Kw angular misalignment (%)

75%

50%

25%

0%

∆Kr r

adia

l mis

alig

nmen

t (%

)

20

0

40

60

80

100

20 30 40 60 80 100

angularradialaxial

Figure 9: Compensating for misalignment

Figure 10: Types of misalignment

SALES PROGRAMME

Magnetic ClutchesNo-contact torque transmissioncombined with jerk- and abra-sion-free overload protection.

Fon (+49) 60 22/22 04-0 · Fax (+49) 60 22/22 04-11eMail: [email protected] · Internet: http://www.gerwah.comLützeltaler Strasse 1-5 · D-63868 Grosswallstadt, Germany

DIN EN ISO 9001

®

Servo Insert CouplingsBacklash-free torque transfer,torsionally elastic damping, uni-versal misalignment capacity.

Metal Bellow CouplingsBacklash-free torque transfer,torsional stiffness for synchro-nous operation, universalmisalignment capacity, suitablealso for high torque values.

Safety CouplingsExact torque limitation bypositive-locking body, backlash-free, overload is indicated bysignals.

Miniature CouplingsBacklash-free torque transfer,torsional stiffness for synchro-nous operation, universal misa-lignment capacity, for lowesttorque values.

LockingElementsInternally clamping connectionuniversally applicable on ac-count of small locating space.

LockingAssembliesInternally clamping connectionfor high torque values; also self-centering with large tolerances.

® Shrink DiscsExternally clamping connection,also suitable for very high tor-ques, the concentricity is notaffected by the clampingsystem.

®

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®

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