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Flexible couplings N-EUPEX and N-EUPEX DS series

  • Информационные материалы

    Информационные материалы

    N-EUPEX as overload-holding, fail-safe series

    N-EUPEX DS as overload-shedding, non-fail-safe series

    N-EUPEX and N-EUPEX DS claw couplings connect machines. They compensate for shaft misalignment, generating only low restorative forces.

    The torque is conducted through elastomer flexibles, so the coupling has typically flexible rubber properties.

    N-EUPEX couplings are overload-holding. By contrast, the N-EUPEX DS series is designed so that overload or advanced wear causes irreparable damage to the elastomer flexibles. The metal parts of N-EUPEX DS couplings can then rotate freely against one another without contact.

    Elastomer flexible of the N-EUPEX series

    The flexibles of the N-EUPEX coupling are subjected to compression. If the flexibles are irreparably damaged, the hub parts come into contact with metal. This “emergency operation capability” is required, e.g., in the case of fire pump drives.

    Elastomer flexible of the N-EUPEX DS series

    The flexibles of the N-EUPEX DS series are subjected to compression and bending forces. If the flexibles are irreparably damaged, the metal parts turn against one another without contact, and the power transmission is separated. Fitting new flexibles will make the coupling once more usable.

    The capacity of the N-EUPEX DS series to shed overloads is especially in demand for highly sensitive machines.

    Область применения

    The N-EUPEX coupling is available as a catalog standard in 23 sizes with a rated torque of between 19 Nm and 62000 Nm. The coupling is suitable for use at ambient temperatures of between –30 °C and +80 °C. By using alternative elastomer buffers, the permissible ambient temperature range can be extended to between –50 °C and +100 °C.

    Frequently, the coupling is used to connect the motor to the gear unit input shaft. The coupling is suitable especially for drives with uniform to average dynamic loads. Examples of applications are pump drives, ventilator drives or crane running gear. Furthermore, N-EUPEX couplings can be used as add-on couplings, particularly on FLUDEX fluid couplings or ARPEX AKR safety couplings. In the case of drives with a diesel engine, N-EUPEX couplings are suitable for driven machines with a low mass moment of inertia.

    In the case of diesel engine drives, the actual dynamic coupling load should be checked by measurement or torsional vibration calculations.

    Coupling suitable for potentially explosive environments. Complies with Directive 94/9/EC for:

    II 2 G T4 / T5 / T6 D120 °C

    –30 °C ≤ Ta ≤ +80 °C / +50 °C / +40 °C

    I M2

    Дизайн

    N-EUPEX and N-EUPEX DS couplings consist of two hub parts mounted on the machine shafts. The coupling parts are connected positively by means of elastomer flexibles. On the twopart variant, the elastomer flexibles can be changed only if one of the coupled machines is moved. On the three-part variants, the bolted cam ring can be released and moved to enable the flexible to be changed without moving the coupled machines.

    Materials

    Cam parts, pocket parts, adapters and hubs

    Grey cast iron EN-GJL-250

    Flexible materials

    • N-EUPEX Series

    Material/description

    Hardness

    Identification

    Ambient temperature

    NBR standard type

    80 Shore A

    Flexible black with blue stripe

    –30 °C … +80 °C

    NBR soft

    65 Shore A

    Flexible black with green stripe

    –30 °C … +80 °C

    NBR hard

    90 Shore A

    Flexible black with magenta stripe

    –30 °C … +80 °C

    NBR normal low backlash

    80 Shore A

    Flexible black with yellow stripe

    –30 °C … +80 °C

    NBR soft low backlash

    65 Shore A

    Flexible black with white stripe

    –30 °C … +80 °C

    NR for low temperature

    80 Shore A

    Flexible black with orange stripe

    –50 °C … +50 °C

    HNBR high temperature

    80 Shore A

    Flexible black with red stripe

    –10 °C … +100 °C



    • N-EUPEX DS Series

    Material/description

    Hardness

    Identification

    Ambient temperature

    NBR compound flexibles
    for size 66 …  272

    80/90 ShoreA
    2 components

    Flexible black

    –30 °C … +80 °C

    NBR hard
    for size 305 ... 556

    90 Shore A

    Flexible black

    –30 °C … +80 °C

    PU electrically insulating

    95 Shore A

    Flexible blue

    –30 °C … +50 °C



    PU elastomer flexibles in special design on request.

    The technical data and the product codes do not include the flexible variants NBR low backlash, HNBR high temperature and
    NR low temperature and the DS flexibles polyurethane electrically insulating.

    Technical data, prices and product codes on request.

    Brake disks

    EN-GJS-400 spheroidal graphite cast iron or S355J2G3 steel

    Brake drums

    Grey cast iron EN-GJL-250

    Low-temperature application

    Shock loads in the drive caused by e.g. starting of drives with large masses to be accelerated (e.g. in fan drives) result in high component loads, particularly at low temperatures.
    For such applications a particularly robust coupling series must be selected. Of the flexible couplings, the RUPEX pin-and-bush coupling is especially suited for this.

    Types of N-EUPEX claw coupling

    Type

    Description

    A

    Fail-safe, 3-part

    B

    Fail-safe, 2-part

    D

    Fail-safe. 3-part, flange variant

    E

    Fail-safe. 2-part, flange variant

    H

    Fail-safe, with adapter

    O

    Fail-safe, 2-part, with brake drum

    P

    Fail-safe, 3-part, with brake drum

    EBD

    Fail-safe, 2-part, with brake disk

    DBD

    Fail-safe, 3-part, with brake disk

    DBDR

    Fail-safe, 3-part, with brake disk, brake disk radially dismountable

    ADS

    Non-fail-safe, 3-part

    BDS

    Non-fail-safe, 2-part

    HDS

    Non-fail-safe, with adapter



    Further application-related coupling types are available. Dimension sheets for and information on these are available on request.

    Types of N-EUPEX claw coupling on request

    Type

    Description

    AT

    Fail-safe, 3-part, with Taper clamping bush

    BT

    Fail-safe, 2-part, with Taper clamping bush

    G

    Fail-safe, 2-part, with intermediate shaft

    F

    Fail-safe, 3-part, with intermediate shaft

    K

    Fail-safe, 3-part, with brake drum to customer's requirement

    L

    Fail-safe, 2-part, with brake drum to customer's requirement

    M

    Fail-safe, 2-part, with flange dimensions to SAE J620d



    Modular principle of N-EUPEX types

    Types A and ADS

    Types B and BDS

    Type D

    Type E

    Type P

    Type O

    Type DBDR

    Type DBD

    Type EBD

    Types H and HDS

    Further application-related coupling types are available. Dimension sheets for and information on these are available on request.

    Функции

    The motor torque is transmitted to the hub at the drive end via the shaft-hub connection, which is mostly designed as a keyway connection. The torque is transmitted to the hub on the output side with the aid of elastomer flexibles. The hub on the output side further transmits the torque to the driven machine or a gear unit placed in between. Because of the primarily compressionloaded elastomer flexibles, the coupling has a progressive torsional stiffness.

    In the case of the N-EUPEX DS coupling series, the elastomer flexible is subjected to bending and compression loads. In the event of overload or advanced wear, the coupling disconnects positively and the flexibles are irreparably damaged. The metal parts then rotate without touching one another. After new elastomer flexibles are fitted, the N-EUPEX DS coupling is once more operable.

    N-EUPEX DS couplings are maintenance-free, even in potentially explosive environments, so long as the possible torque interruption does not lead to an unacceptable disruption of the production process.

    Особенности

    N-EUPEX couplings are designed on the modular principle and have a very simple construction. N-EUPEX types are made up of subassemblies to suit requirements. The couplings are assembled by simply fitting the coupling halves together. Wear is restricted to the elastomer flexibles, which must be replaced at the end of their service life.
    Depending on type, the elastomer flexibles can be changed without moving the coupled machines.
    The coupling parts are readily available from stock and are mostly finish-machined, i.e. with finished bore, keyway, set screw and balancing.

    Optionally:

    The wear indicator for N-EUPEX couplings enables the condition of the flexible to be easily assessed. The wear condition can also be ascertained with the aid of a stroboscope while the coupling is rotating. The production process can thus continue undisturbed.

    If the stroboscope is to be used in a potentially explosive environment, you can enquire about the equipment for this at FLENDER.

    The wear indicator must be attached to the outside diameter of the coupling after the coupling has been fitted.

    Технические данные

    Power ratings of the N-EUPEX series

    Size

    Rated torque for
    flexible type

    Torsional stiffness at 50 %
    capcity utilization for flexible type

    Assembly

    Permitted shaft alignment at n = 1500 rpm 1)

     

    65 ShoreA

    80 ShoreA

    90 ShoreA

    65 ShoreA

    80 ShoreA

    90 ShoreA

    Gap dimension 2)

    Axial

    Radial

    Angle

     

    TKN

    TKN

    TKN

    CTdyn 50 %

    CTdyn 50 %

    CTdyn 50 %

    ΔS

    ΔKa

    ΔKr

    ΔKw

     

    Nm

    Nm

    Nm

    kNm/rad

    kNm/rad

    kNm/rad

    mm

    mm

    mm

    °

    58

    11

    19

    19

    0.21

    0.50

    0.93

    1.0

    0.2

    0.2

    0.15

    68

    21

    34

    34

    0.39

    0.90

    1.80

    1.0

    0.2

    0.2

    0.15

    80

    37

    60

    60

    1.05

    2.40

    4.50

    1.0

    0.2

    0.2

    0.12

    95

    63

    100

    100

    1.64

    4.00

    7.40

    1.0

    0.2

    0.2

    0.12

    110

    100

    160

    160

    2.49

    6.00

    11.40

    1.0

    0.2

    0.2

    0.10

    125

    150

    240

    240

    3.70

    9.00

    17

    1.0

    0.25

    0.25

    0.10

    140

    230

    360

    360

    5.60

    13.2

    25

    1.0

    0.25

    0.25

    0.10

    160

    350

    560

    560

    11.2

    26.7

    51

    2.0

    0.3

    0.3

    0.10

    180

    550

    880

    880

    19.2

    46

    88

    2.0

    0.3

    0.3

    0.10

    200

    850

    1340

    1340

    31.6

    75

    139

    2.0

    0.3

    0.3

    0.09

    225

    1260

    2000

    2000

    48

    115

    212

    2.0

    0.35

    0.35

    0.09

    250

    1760

    2800

    2800

    68

    162

    302

    2.5

    0.35

    0.35

    0.08

    280

    2460

    3900

    3900

    95

    226

    420

    2.5

    0.4

    0.4

    0.08

    315

    3500

    5500

    5500

    171

    370

    730

    2.5

    0.4

    0.4

    0.08

    350

    4850

    7700

    7700

    235

    520

    950

    2.5

    0.5

    0.5

    0.08

    400

    6500

    10300

    10300

    316

    750

    1420

    2.5

    0.5

    0.5

    0.08

    440

    8500

    13500

    13500

    390

    930

    1920

    2.5

    0.6

    0.6

    0.08

    480

    10500

    16600

    16600

    510

    1200

    2300

    2.5

    0.6

    0.6

    0.07

    520

    13300

    21200

    21200

    600

    1410

    2710

    2.5

    0.65

    0.65

    0.07

    560

    18300

    29000

    29000

    1000

    2340

    4400

    3.0

    0.65

    0.65

    0.07

    610

    24000

    38000

    38000

    1300

    3030

    5700

    3.0

    0.75

    0.75

    0.07

    660

    30900

    49000

    49000

    1640

    3800

    7100

    3.0

    0.8

    0.8

    0.07

    710

    39000

    62000

    62000

    2140

    4900

    9100

    3.0

    0.9

    0.9

    0.07



    1) The maximum speed of the respective type must be noted. For further information on permissible shaft misalignment, please see the operating instructions.

     2) Does not apply to type H.

    For maximum coupling torque: TKmax = 3.0 · TKN

    For coupling overload torque: TKOL = 3.5 · TKN

    For coupling fatique torque: TKW = 0.15 · TKN, where TN > TW must be adhered to.

    Torsional stiffness and damping

    The values stated in the above table apply to a capacity utilization of 50 %, an excitation amplitude of 10 % TKN with the frequency 10 Hz and an ambient temperature of 20 °C. Dynamic torsional stiffness is dependent on load and increases in proportion to capacity utilization. The following table shows the correction factors for different nominal loads.

    CTdyn = CTdyn 50 % · FKC

     

    Capacity utilization TN/TKN

     

    20 %

    40 %

    50 %

    60 %

    70 %

    80 %

    100 %

    Correction factor FKC
    65/80/90 ShoreA

    0.54

    0.84

    1.00

    1.18

    1.36

    1.55

    1.97



    The damping coefficient is Ψ = 1.4

    Furthermore, torsional stiffness and damping depend on the ambient temperature and the frequency and amplitude of the torsional vibration excitation. More precise torsional stiffness and damping parameters on request

    Permitted shaft misalignment

    The permitted shaft misalignment depends on the operating speed. As the speed increases, lower shaft misalignment values are permitted. The following table shows the correction factors for different speeds.
    The maximum speed for the respective coupling size must be observed!

    ΔKperm = ΔK1500 · FKV

     

    Speed in rpm

     

    500

    1000

    1500

    3000

    Correction factor FKV

    1.7

    1.2

    1.0

    0.70



    The axial misalignment may occur dynamically at frequencies up to 10 Hz. For fitting a maximum gap dimension of Smax = S + ΔS and a minimum gap dimension of Smin = S – ΔS is permitted. Shaft misalignments ΔKa, ΔKr and ΔKw may occur simultaneously.

    Power ratings of the N-EUPEX DS series

    Size

    Rated torque

    Torsional stiffness at 50 %
    capcity utilization

    Assembly

    Permitted shaft misalignment at
    speed n = 1500 rpm

       

    Gap dimension 1)

    Axial

    Radial

    Angel

     

    TKN

    CTdyn

    ΔS

    ΔKa

    ΔKr

    ΔKw

     

    Nm

    kNm/rad

    mm

    mm

    mm

    °

    66

    19

    0.73

    1.0

    0.2

    0.2

    0.15

    76

    34

    1.36

    1.0

    0.2

    0.2

    0.15

    88

    60

    2.62

    1.0

    0.2

    0.2

    0.12

    103

    100

    4.00

    1.0

    0.2

    0.2

    0.12

    118

    160

    6.30

    1.0

    0.2

    0.2

    0.10

    135

    240

    10.5

    1.0

    0.25

    0.25

    0.10

    152

    360

    13.6

    1.0

    0.25

    0.25

    0.10

    172

    560

    27.2

    2.0

    0.3

    0.3

    0.10

    194

    880

    47.0

    2.0

    0.3

    0.3

    0.10

    218

    1340

    70.0

    2.0

    0.3

    0.3

    0.09

    245

    2000

    106

    2.0

    0.35

    0.35

    0.09

    272

    2800

    149

    2.5

    0.35

    0.35

    0.08

    305

    3900

    214

    2.5

    0.4

    0.4

    0.08

    340

    5500

    350

    2.5

    0.4

    0.4

    0.08

    380

    7700

    480

    2.5

    0.5

    0.5

    0.08

    430

    10300

    730

    2.5

    0.5

    0.5

    0.08

    472

    13500

    990

    2.5

    0.6

    0.6

    0.08

    514

    16600

    1270

    2.5

    0.6

    0.6

    0.07

    556

    21200

    1540

    2.5

    0.65

    0.65

    0.07



    1) Does not apply to type HDS.

    Flexibles of sizes 66 to 272 are of the compound type with a hard core and soft thrust pieces.
    Sizes 305 to 556 are of 90 ShoreA NBR material.

    For maximum coupling torque: TKmax = 2.0 · TKN

    For coupling overload torque: TKOL = 3.0 · TKN

    For coupling fatigue torque: TKW = 0.15 · TKN

    Torsional stiffness and damping

    The values stated in the above table apply to a capacity utilization of 50 %, an excitation amplitude of 10 % TKN with the frequency 10 Hz and an ambient temperature of 20 °C. Dynamic torsional stiffness is dependent on the load and increases in proportion to capacity utilization. The following table shows the correction factors for different rated loads.

    CTdyn = CTdyn 50 % · FKC

     

    Capacity utilization TNTKN

     

    20 %

    40 %

    50 %

    60 %

    70 %

    80 %

    100 %

    Correction factor FKC

    0.7

    0.9

    1

    1.1

    1.2

    1.3

    1.5



    The damping coefficient isΨ = 1,4
    Torsional stiffness and damping is further dependent on the ambient temperature and the frequency and amplitude of the torsional vibration excitation. More precise torsional stiffness and damping parameters on request.

    Permitted shaft misalignment

    The permitted shaft misalignment depends on the operating speed. As the speed increases, lower shaft misalignment values are permitted. The following table shows the correction factors for different speeds.
    The maximum speed for the respective coupling size must be noted!

    ΔKperm = ΔK1500 · FKV

     

    Speed in rpm

     

    500

    1000

    1500

    3000

    Correction factor FKV

    1.6

    1.20

    1.0

    0.70



    The axial misalignment must occur dynamically at frequencies up to 10 Hz. For fitting a maximum gap dimension of Smax = S + ΔS and a minimum gap dimension of Smin = S – ΔS are permitted.

    Shaft misalignment ΔKa, ΔKr and ΔKw may occur simultaneously.

    Assignment of N-EUPEX sizes to IEC standard motors

    The assignment applies to an application factor of 1.25.

    Outputs PM of IEC motors and assigned N-EUPEX couplings

    Three-phase motor

    Output at ≈ 3000 rpm

    N-EUPEX coupling

    Output at ≈ 1500 rpm

    N-EUPEX coupling

    Output at ≈ 1000 rpm

    N-EUPEX coupling

    Output at ≈ 750 rpm

    N-EUPEX coupling

    DE shaft end D x E to IEC

    Size

    PM

    Size

    PM

    Size

    PM

    Size

    PM

    Size

    D

    E

     

    kW

     

    kW

     

    kW

     

    kW

     

    mm

    mm

    56

    0.09

    58

    0.06

    58

        

    9

    20

     

    0.12

    58

    0.09

    58

          

    63

    0.18

    58

    0.12

    58

        

    11

    23

     

    0.25

    58

    0.18

    58

          

    71

    0.37

    58

    0.25

    58

        

    14

    30

     

    0.55

    58

    0.37

    58

          

    80

    0.75

    58

    0.55

    58

    0.37

    58

      

    19

    40

     

    1.1

    58

    0.75

    58

    0.55

    58

        

    90S

    1.5

    68

    1.1

    68

    0.75

    68

      

    24

    50

    90L

    2.2

    68

    1.5

    68

    1.1

    68

      

    24

    50

    100L

    3

    80

    2.2

    80

    1.5

    80

    0.75

    80

    28

    60

       

    3

    80

      

    1.1

    80

      

    112M

    4

    80

    4

    80

    2.2

    80

    1.5

    80

    28

    60

    132S

    5.5

    95

    5.5

    95

    3

    95

    2.2

    95

    38

    80

     

    7.5

    95

            

    132M

      

    7.5

    95

    4

    95

    3

    95

    38

    80

         

    5.5

    95

        

    160M

    11

    95

    11

    95

    7.5

    95

    4

    95

    42

    110

     

    15

    95

        

    5.5

    95

      

    160L

    18.5

    95

    15

    110

    11

    110

    7.5

    110

    42

    110

    180M

    22

    110

    18.5

    110

        

    48

    110

    180L

      

    22

    125

    15

    125

    11

    125

    48

    110

    200L

    30

    125

    30

    125

    18.5

    125

    15

    125

    55

    110

     

    37

    125

      

    22

    140

        

    225S

      

    37

    140

      

    18.5

    140

    55

    110

             

    60

    140

    225M

    45

    125

    45

    140

    30

    140

    22

    140

    55

    110

             

    60

    140

    250M

    55

    140

    55

    160

    37

    160

    30

    160

    60

    140

             

    65

    140

    280S

    75

    160

    75

    180

    45

    180

    37

    180

    65

    140

             

    75

    140

    280M

    90

    160

    90

    180

    55

    180

    45

    180

    65

    140

             

    75

    140

    315S

    110

    160

    110

    200

    75

    200

    55

    200

    65

    140

             

    80

    170

    315M

    132

    160

    132

    200

    90

    200

    75

    200

    65

    140

             

    80

    170