Catalog CX-N/NL-E-0�-05Power TransmissionLeading by innovation

CENTAX®-SECSuper Elastic Coupling system

SERIES N and NLfor freestanding Marine gears with high speed Diesel engines

We reserve the right to amend any dimensions or detail speci-fied or illustrated in this publication without notice and without incurring any obligation to provide such modification to such couplings previously delivered. Please ask for an application drawing and current data before making a detailed coupling selection. We would like to draw your attention to the need of prevent-ing accidents or injury. No safety guards are included in our supply. Copyright to this technical document is held by CENTA Antriebe Kirschey GmbH. CENTAX® registered trademark of CENTA Antriebe.

Torsional responsibility

The responsibility for ensuring the torsional vibration com­patibility of the complete drive train, rests with the final assem-bler. As a component supplier, CENTA is not responsible for such calculations, and cannot accept any liability for gearbox noise/damage or coupling damage caused by torsional vibrations. CENTA recommend that a torsional vibration analysis is carried out on the complete drive train prior to start up the machinery. Generally, torsional vibration analysis can be undertaken by engine manufacturers, consultants or classicfication societies. CENTA can assist with such calculations using our broad expe­rience in coupling applications and torsional vibrations.

Diesel engines, which are mounted seperately from the marine gear, can be placed on rather soft flexible mounts, because then these mounts must not bear the axial thrust of the propeller. These soft mounts provide optimum isolation of the vibrations of the diesel engine from the hull.In this case, the flexible couplings must be able to dampen the torsional vibrations and to absorb the unavoidable, substantial misa-lignments, mainly radial misalignment, bet-ween the engine and the gear.

For these applications CENTA has develo-ped special, purposely designed flexible cou-plings:

CENTAX-N and CENTAX-NL for the torque range up to 25 kNm.

Specially for high speed diesel engines with SAE-flywheels in the power range up to about 2500 kW, the CENTAX-series CX-N and CX-NL are a technically and commercially advan-tageous solution.

This is an economical combination of a torsional and radial flexible CENTAX rubber element with an axial and angular flexible steel membrane or link system. The steel membrane of the CX­N compen-sates for moderate axial and angular misalignments and the link system of the CX­NL provides outstan-ding flexibility for substantial misalignments.In order to achieve good torsional behaviour, the secondary inertia of the coupling has purposely been made large enough, so that the main order of the torsional vibration is usually shifted well below idling speed of the diesel engine. Therefore no gear chatter should occur. If in single cases more inertia should be required, the OD of the output flange and thereby its inertia can easily be increased.

Important features and advantages of the CENTAX­series N and NL:

• High compensation of misalignment in radial, axial and angular direction with low reaction forces.

• High torsional flexibility with linear characteri-stics. Various shore hardnesses result in diffe-rent torsional stiffness for optimum tuning of the torsionals and for damping of vibration and noise.

• High allowable energy loss by intensive inner and outer ventilation.

• Economical design and well proven parts pro-duced in series, low weight and favourable con-necting dimensions.

• Free of maintenance and wear, long life expec-tancy, easy assembly and disassembly with radial removal of elements in­situ.

• Engine connection dimensions acc. SAE, special flanges are possible. The driven hubs made of high grade steel with connections for the various gear input shafts are available on short delivery.

• Torque range from 1.1 up to 25 kNm at the moment. For higher torques up to 650 kNm we recommend the larger sizes of the CENTAX­SEC series.

Please refer to the CENTAX­SEC main catalog, where detailed explanations of the Technical Data are also available.

CENTA Power Transmission leading by innovationCX-N/NL-2

Technical Data

CENTAXsize

Shore­hardness

Nominaltorque

Max.torque

Continu-ous vibr. torque at

10 Hz

Dyn. torsional stiffness

Specific torsional stiffness

Allowable energy

loss30°C

Relative damping

Allowable axial shaft

displacement

Axial stiff-ness

Allowable radial shaft

displace-ment

Radial stiffness

50°C

Allowable angular dis-placement

Max. speed

ShoreA

TKN[kNm]

TKmax[kNm]

TKW[kNm]

CTdyn[kNm/rad] CTdyn/TKN

PKV[KW]

∆Ka

[mm]Cka

[kN/mm]∆Kr

[mm]Crdyn

[kN/mm]∆Kr[°]

nmax[min­1]

N NL N NL N NL

35455060

1,101,201,40

3,303,604,20

0,280,300,35

4,805,807,20

4,364,835,14

0,200,210,23

1,001,051,10

±5 – 0,18 –3,003,002,00

0,360,420,50

0,5 – 3600

45455060

1,601,802,20

4,805,406,60

0,400,450,55

7,108,5010,60

4,444,724,82

0,230,240,26

1,001,051,10

±5 – 0,20 –3,003,002,00

0,410,490,59

0,5 – 3600

51455060

2,102,503,00

6,307,509,00

0,530,630,75

9,7011,3014,10

4,624,524,70

0,260,270,29

1,001,051,10

±5 – 0,30 –3,003,002,00

0,470,680,80

0,5 – 3600

52

45506070

2,252,803,003,50

6,758,409,0010,50

0,560,700,750,88

10,2012,0015,0029,00

4,534,295,008,29

0,270,280,290,30

1,001,051,101,15

±5 ±10 0,22 0,29

3,003,003,001,00

0,370,440,530,91

0,5 1 3600

56

45506070

2,903,504,004,40

8,7010,5012,0013,20

0,730,881,001,10

13,0015,4019,3036,50

4,484,404,838,30

0,300,310,330,35

1,001,051,101,15

±5 ±10 0,28 0,29

3,003,002,001,00

0,420,490,591,03

0,5 1 3600

64506070

5,506,006,50

16,5018,0019,50

1,381,501,63

21,2026,3056,00

3,854,388,62

0,360,380,40

1,051,101,15

±5 ±10 0,47 0,363,003,001,00

1,001,302,10

0,5 1 2900

67506070

6,006,607,20

18,0019,8021,60

1,501,651,80

25,5031,0065,00

4,277,708,47

0,360,380,40

1,051,101,15

±5 ±10 0,53 0,403,003,001,00

1,301,602,80

0,5 1 2900

66506070

7,508,259,00

22,5024,7527,00

1,882,062,25

47,0059,00105,00

6,277,1511,67

0,460,480,50

1,051,101,15

±5 ±10 0,69 0,434,004,001,20

1,201,502,50

0,5 1 2900

69506070

11,0012,0013,00

33,0036,0039,00

2,753,003,25

68,0085,00155,00

6,187,1011,92

0,540,570,60

1,051,101,15

±5 ±13 0,53 0,524,004,001,20

1,401,803,00

0,5 1 2900

71506070

11,5012,5013,00

34,5037,5039,00

2,883,133,25

68,0085,00155,00

5,916,8011,92

0,540,570,60

1,051,101,15

±5 ±13 0,84 0,524,004,001,20

1,501,803,00

0,5 1 2900

72506070

15,0016,5018,00

45,0049,5054,00

3,754,134,50

94,50118,00212,00

6,307,1511,78

0,610,640,67

1,051,101,15

±6 ±13 1,00 0,625,005,001,50

1,802,203,80

0,5 1 2750

75506070

20,0022,0025,00

60,0066,0075,00

5,005,506,25

135,00169,00305,00

6,757,1512,20

0,680,710,75

1,051,101,15

±6 ±13 1,12 0,755,505,501,70

2,102,504,30

0,5 1 2300

For further explanation of the technical data please refer to the general section of the CENTAX­SEC catalog

CX­N CX­NL

CENTA Power Transmission leading by innovationCX-N/NL-�

CENTAX-NFS-�00with membrane

Dimensions massesmass moments of inertia

CENTAXsize

Nominaltorque A C d1 d6 E L N Flange Dimension

TKN[KNm]

min. – max.SAE DA DT Z S

J620 js7

35­SAE11,5 1,1 ­ 1,4 124,9 230 20 ­ 85 380 4 100 125 11,5/290 352,4 333,4 8x45° 11

45­SAE11,5 1,6 ­ 2,2 127,4 232 20 ­ 85 400 5 100 125 11,5/290 352,4 333,4 8x45° 11

45­SAE14 1,6 ­ 2,2 129,9 210 20 ­ 85 400 4 100 125 14/355 466,7 438,2 8x45° 13

51­SAE11,5 2,1 ­ 3,0 126,4 232 20 ­ 85 400 5 100 125 11,5/290 352,4 333,4 8x45° 11

52­SAE14 2,25 ­ 3,0 152,0 256 45 ­ 115 460 5 125 160 14/355 466,7 438,2 16x22,5° 12,5

56­SAE14 2,9 ­ 4,0 153,0 256 45 ­ 115 460 5 125 160 14/355 466,7 438,2 16x22,5° 12,5

64­SAE14 5,5 ­ 6,5 164,5 280 50 ­ 118 500550* 6 140 165 14/355 466,7 438,2 16x22,5° 12,5

67­SAE18 6,0 ­ 7,2 162,5 279 50 ­ 118 550 5 140 165 18/460 571,5 542,9 12x30° 17

66­SAE18 7,5 ­ 9,0 150,5 285 65 ­ 118 600 6 155 185 18/460 571,5 542,9 12x30° 17

69­SAE18 11,0 ­ 13,0 162,0 298 65 ­ 150 588 7 160 210 18/460 571,5 542,9 6x60° 17

71­SAE21 11,5 ­ 13,0 161,5 297 65 ­ 150 588 6 160 210 21/530 673,1 641,4 24x15° 17

72­SAE21 15,0 ­ 18,0 175,0 327 80 ­ 150 672 7 180 235 21/530 673,1 641,4 24x15° 17

75­SAE24 20,0 ­ 25,0 206,5 375 65 ­ 170 722 10 200 235 24/610 733,4 692,2 24x15° 19

* In some cases (e.g. on 10 cyl. engines) the torsional analysis may require the higher inertia of the larger dia d6.

CENTAXsize flange type mass moments of inertia

[kgm2]mass[kg]

distance to centre of gravity[mm]

SAE J620 J1 J2 m1 m2 mtotal S1 S2

35 SAE11,5/290 0,068 0,366 3,4 30,2 33,6 7,5 108,5

45 SAE11,5/290 0,056 0,45 2,4 34,4 36,8 8,0 113,0

45 SAE14/355 0,17 0,44 5,7 31,8 37,5 6,0 97,0

51 SAE11,5/290 0,071 0,45 3,8 33,6 37,4 9,5 112,5

52 SAE14/355 0,16 1,04 4,9 55,3 59,8 7,5 117,5

56 SAE14/355 0,17 1,04 5,2 55,2 60,4 8,4 115,9

64 SAE14/355 0,24 1,47 / *1,92 7,2 65,9 / *72,9 73,1 / *80,1 10,0 132,5 / *135,3

67 SAE18/460 0,46 1,84 10,3 72,0 82,3 7,3 134,0

66 SAE18/460 0,47 2,84 9,1 91,1 100,2 7,8 146,0

69 SAE18/460 0,57 3,49 9,7 111,0 120,7 11,1 148,0

71 SAE21/530 0,97 3,50 13,6 111,1 124,7 7,6 148,0

72 SAE21/530 1,14 5,76 15,2 147,1 162,3 10,9 163,0

75 SAE24/610 2,22 9,36 25,5 193,2 218,7 13,0 193,0

* this spacer for radial exchange only for sizes 35, 45 and 51**this adapter only for sizes 35, 45­SAE14, and other sizes as

special version with larger SAE or non standard flanges.

*

**

CENTA Power Transmission leading by innovationCX-N/NL-�

CENTAX-NFS-�01with membrane and failsafe

Dimensions massesmass moments of inertia

CENTAXsize

Nominaltorque A C d1 d6 E L N Flange Dimension

TKN[KNm]

min. – max.SAE DA DT Z S

J620 js7

35­SAE11,5 1,1 ­ 1,4 134 240 20 ­ 85 380 18 100 125 11,5/290 352,4 333,4 8x45° 11

45­SAE11,5 1,6 ­ 2,2 139 245 20 ­ 85 400 18 100 125 11,5/290 352,4 333,4 8x45° 11

45­SAE14 1,6 ­ 2,2 139 220 20 ­ 85 400 18 100 125 14/355 466,7 438,2 8x45° 13

51­SAE11,5 2,1 ­ 3,0 139 235 20 ­ 85 400 18 100 125 11,5/290 352,4 333,4 8x45° 11

52­SAE14 2,25 ­ 3,0 171,5 272 45 ­ 115 460 21 125 160 14/355 466,7 438,2 16x22,5° 12,5

56­SAE14 2,9 ­ 4,0 171,5 272 45 ­ 115 460 21 125 160 14/355 466,7 438,2 16x22,5° 12,5

64­SAE14 5,5 ­ 6,5 179,5 296 50 ­ 118 500550* 22 140 165 14/355 466,7 438,2 16x22,5° 12,5

67­SAE18 6,0 ­ 7,2 179,5 296 50 ­ 118 550 22 140 165 18/460 571,7 542,9 12x30° 17

66­SAE18 7,5 ­ 8,7 169,5 301 65 ­ 118 600 22 155 185 18/460 571,5 542,9 12x30° 17

69­SAE18 11,0 ­ 12,5 179,0 315 65 ­ 150 588 24 160 210 18/460 571,5 542,9 6x60° 17

71­SAE21 11,5 ­ 13,0 179,0 315 65 ­ 150 588 24 160 210 21/530 673,1 641,4 24x15° 17

72­SAE21 15,0 ­ 17,5 190,5 344 80 ­ 150 673 24 180 235 21/530 673,1 641,4 24x15° 17

75­SAE24 20,0 ­ 25,0 226,0 395 65 ­ 170 722 30 200 235 24/610 733,4 692,2 24x15° 19

* In some cases (e.g. on 10 cyl. engines) the torsional analysis may require the higher inertia of the larger dia d6.

CENTAXsize flange type mass moments of inertia

[kgm2]mass[kg]

distance to centre of gravity[mm]

SAE J620 J1 J2 m1 m2 mtotal S1 S2

35 SAE11,5/290 0,162 0,389 8,1 32,7 40,8 10,3 113,2

45 SAE11,5/290 0,165 0,492 7,4 36,5 43,9 11,0 119,0

45 SAE14/355 0,470 0,464 14,6 33,9 48,5 10,0 102,0

51 SAE11,5/290 0,196 0,464 9,9 36,1 46,0 12,3 117,0

52 SAE14/355 0,61 1,10 16,7 58,7 75,4 12,0 122,3

56 SAE14/355 0,62 1,11 17,0 59,1 76,1 12,5 122,7

64 SAE14/355 0,74 1,53 /*1,97 20,7 73,5 /*78,6 94,2 /*99,3 14,2 139,2 /*141,1

67 SAE18/460 1,59 1,97 33,2 78,6 111,8 12,7 141,1

66 SAE18/460 1,50 3,00 27,1 96,5 123,6 13,0 148,7

69 SAE18/460 1,50 3,67 24,7 115,9 140,6 12,5 149,9

71 SAE21/530 3,06 3,72 40,1 116,5 156,6 14,4 153,6

72 SAE21/530 3,08 5,87 38,6 162,4 201,0 15,6 168,9

75 SAE24/610 5,85 9,81 65,0 203,8 268,8 19,0 194,6

* this spacer for radial exchange only for sizes 35, 45 and 51**this adapter only for sizes 35, 45­SAE14, and other sizes as

special version with larger SAE or non standard flanges.

*

**

CENTA Power Transmission leading by innovationCX-N/NL-5

CENTAX-NLFS1with Link-coupling

CENTAXsize

Nominaltorque A C d1 d6 E L N Flange Dimension

TKN[KNm]

min. – max.SAE DA DT Z S

J620 js7

52 2,25 ­ 3,0 183 306 45­115 450 5 125 160 14/355 466,7 438,2 16x22,5° 12,5

56 2,9 ­ 4,0 183 306 45­115 450 5 125 160 14/355 466,7 438,2 16x22,5° 12,5

64 5,5 ­ 6,5 189,5 327 50­118 485535* 6 140 165 14/355 466,7 438,2 16x22,5° 12,5

67 6,0 ­ 7,2 188,5 326 50­118 535 5 140 165 18/460 571,5 542,9 12x30° 17

66 7,5 ­ 9,0 178 330,5 70­130 590 6 155 185 18/460 571,5 542,9 12x30° 17

69 11,0 ­ 13,0 189,0 346 65­150 575 7 160 210 18/460 571,5 542,9 6x60° 17

71 11,5 ­ 13,0 188,0 345 65­150 575 6 160 210 21/530 673,1 641,4 24x15° 17

72 15,0 ­ 18,0 236 413 85­165 605 7 180 235 21/530 673,1 641,4 24x15° 17

75 20,0 ­ 25,0 243 439 90­170 685 10 200 235 24/610 733,4 692,2 24x15° 19

* In some cases (e.g. on 10 cyl. engines) the torsional analysis may require the higher inertia of the larger dia d6.

CENTAXsize flange type mass moments of inertia

[kgm2]mass[kg]

distance to centre of gravity[mm]

SAE J620 J1 J2 m1 m2 mtotal S1 S2

52 SAE14/355 0,16 1,00 4,9 53,5 58,4 7,5 146,5

56 SAE14/355 0,17 1,01 5,2 53,8 59,0 8,5 147,0

64 SAE14/355 0,24 1,4/*1,81 7,2 65,3/*71,5 72,5/*78,7 10,0 161,0/*160,1

67 SAE18/460 0,46 1,83 10,4 72,1 82,5 8,0 161,0

66 SAE18/460 0,47 2,83 9,1 91,5 100,6 8,0 172,0

69 SAE18/460 0,57 3,40 9,7 102 111,7 11,0 176,5

71 SAE21/530 0,97 3,41 13,6 102,1 115,7 8,5 176,5

72 SAE21/530 1,14 5,79 15,2 158 173,2 11,0 208,0

75 SAE24/610 2,22 9,24 25,5 197,5 223 13,0 234,5

CENTA Power Transmission leading by innovationCX-N/NL-�

CENTA - the complete range of advanced flexible couplings and shafts for all kinds of boat drives.

CENTA Couplings for flange mounted gears

CENTAMAX-Slinear disc type couplingT = 0,25 - 40 kNm

CENTA Couplings for remote mounted gears, V-drives, stern-drives and water jets

CENTAX-Vintermediate coupling for u/jT = 0,2 - 50 kNm

CENTA-FH flange housing with flexible coupling for u/jT = 1 - 20 kNm

CENTAFLEX-A-G/A-GZ/A-GBtorsional soft flexible shaft for angle up to 2° per elementT = 0,1 - 14 kNm

CENTAFLEX-DSprogressive dual stage couplingT = 0,25 - 2 kNm

CENTAFLEX-Rprogressive roller couplingT = 0,25 - 15 kNm

CENTA also delivers all kinds of flexible couplings and lightweight steel or carbonfibre shafts- with or without propeller thrust - to be installed between gear and propeller or waterjet

Free standing gears - close coupled

CENTAMAX-Bfor slight misalignmentT = 0,25 - 20 kNm

CENTAX-Nfor reasonable misalignmentT = 1,1 - 25 kNm

CENTAX-Lfor substantial misalignmentT = 2 - 90 kNm

CENTAX - L - G -B - DPFor larger boats and ships CENTA has the complete range of advanced flexible couplings and shafts up to 650 kNm torque.

CENTA Couplings for large free standing gears

CENTA Power Transmission leading by innovationCX-N/NL-�

AustraliaCENTA Transmissions Pty. Ltd.P.O. Box 6245South Windsor, NSW 2756

AustriaHainzl Industriesysteme GmbHIndustriezeile 56A-4040 Linz

BelgiumCaldic Techniek Belgium N.V.Tollaan 73B-1932 Sint-Stevens-Woluwe

BrazilCENTA Transmissoes Ltda.Rua Josè AméricoCançado Bahia 199Cidade Industrial32.210-130 Contagem MG

CanadaCENTA CORP.815 Blackhawk DriveWestmont, IL 60559, USA

ChileComercial TGC Ltda.Calle Dr. M. Barros Borgoño 255-263Casilla 16.800 (P.O. Box)Santiago-Providencia

ChinaCENTA Representative OfficeRoom.11C, Cross Region PlazaNo. 899 LingLing RoadShanghai, PC200030

DenmarkCENTA Transmissioner A/SA.C. Illums Vej 5DK-8600 Silkeborg

EgyptHydraulic MisrP.O. Box 418Tenth of Ramadan City

FinlandMovetec OyHannuksentie 1FIN-02270 EPOO

FrancePrud’HommeTransmissions66 Rue des St. DenisB.P. 73F-93302 Aubervilliers Cedex

GermanyCENTA AntriebeKirschey GmbHBergische Str. 7D-42781 Haan

Great BritainCENTA Transmissions Ltd.Thackley Court,Thackley Old Road,Shipley, Bradford, West Yorkshire, BD18 1BW

GreeceIndustry: Marine:Kitko S.A. Technava S.A.

1, Rodon St. 6,Loudovikou Sq.17121 N.Smymi 18531 PiraeusAthens

Hong Kong/ChinaFoilborn Enterprise Ltd.Unit A8-9, 13/FVeristrong Industrial Centre34-36 Au Pui Wan StreetFotan, ShatinN.T. Hong Kong

IndiaNENCONational Engineering CompanyJ-225, M.I.D.C., Bhosari,Pune - 411 026

IsraelRedco Equipment & Industry3, Rival StreetTel Aviv 67778IL - Tel Aviv

ItalyCENTA Transmissioni SrlViale A. De Gasperi, 17/19I-20020 Lainate (Mi)

JapanMiki Pulley Co.Ltd.1-39-7, Komatsubara Zama-City, KanagawaJAPAN 228-857

KoreaMarine Equipment Korea Co. Ltd.#823, Ocean Tower760-3 Woo 1 DongHaeundae-Gu, Busan

MexicoCENTA CORP.815 Blackhawk DriveWestmont, IL 60559, USA

NetherlandsCENTA Nederland b.V.Nijverheidsweg 4NL-3251 LP Stellendam

New ZealandBrevini Ltd.9 Bishop Croke PlaceEast TamakiPO Box 58-418 - GreenmountNZ-Auckland

NorwayCENTA transmisjoner A.S.P.O.B. 1551N-3206 Sandefjord

PolandIndustry: Marine:IOW Trade FBSMSp.z.o.o. Engineering & Co. ul. Zwolenska 17 UL.Podmokla 304-761 Warszawa 71-776 Szczecin

PortugalPINHOL Import Dep.Avenida 24 de Julho, 174P - LISBOA 1350

SingaporeCENTA TRANSMISSIONSFAR EAST PTE LTD51 Bukit Batok Crescent #05-24 Unity CentreSingapore 658077

South AfricaEntramarc (PTY) Ltd.P.O. Box 691892021 BryanstonZA - Transvaal

SpainHerrekor S.A.Zamoka LantegialdeaOialume Bidea 25, Barrio ErgobiaES-20116 Astigarraga-Gipuzkoa

SwedenCENTA Transmission Sweden ABMetalgatan 21AS-26272 Ängelholm

SwitzerlandHAWE – Hydratec AGChamerstrasse 172CH-6300 Zug

TaiwanACE Pillar Trading Co., Ltd.No. 2 Lane 61, Sec. 1. Kuanfu Road, San-Chung City, R.O.C. Taipei

TurkeyIndustry:Erler Makina ve Gida Sanayi Ltd.Sti.IvedikOrganize SanayiHas Emek Sitesi 676. Sokak No. 3Ostim/Ankara

USACENTA CORP.815 Blackhawk DriveWestmont, IL 60559

CENTA Antriebe is also represented in:Bulgaria, CSFR, Hungaria, Jugoslavia, Romania and further countries.

CENTA the international service

CENTA Headquarters Germany

CENTA Australia

CENTA Denmark

CENTA Italy CENTA Great Britain CENTA Singapore

CENTA Netherland

CENTA Norway

CENTA USA

D-42755 Haan P.O.B 1125tel.: ++49-2129-912-0e-mail: centa@centa.de

Bergische Strasse 7Fax: ++49-2129-2790http://www.centa.de

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