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Highly flexible couplings ELPEX-B series

  • Информационные материалы

    Информационные материалы

    ELPEX-B couplings are highly flexible and free of torsional backlash. Because of their low torsional stiffness and damping capacity, ELPEX-B couplings are especially suitable for coupling machines with a highly non uniform torque pattern. ELPEX-B couplings are also suitable for connecting machines with high shaft misalignment.

    Standard ELPEX-B coupling types are designed as shaft-shaft connections. Application-related types can be manufactured on request.

    Область применения

    The ELPEX-B coupling is available as a catalog standard in 15 sizes with a rated torque of between 24 Nm and 14500 Nm. The coupling can be fitted with elastic tires made of natural rubber for ambient temperatures of –50 °C to +50 °C and with elastic tires made of chloroprene rubber for –15 °C to +70 °C. The chloroprene rubber tire is marked FRAS, “Fire-resistant and Antistatic”.

    Дизайн

    The ELPEX-B coupling's transmission characteristic is determined essentially by the elastic tire. The elastic tire is manufactured from a natural rubber or a chloroprene rubber mixture with a multiply fabric insert. The elastic tire is fastened to the hubs with bolts and two clamping rings.

    In type EBWT, the shaft-hub connection is achieved with Taper clamping bushes, in type EBWN with finish-drilled hubs and parallel keys. The type EBWZ connects the machine shafts additionally via a detachable adapter.

    Materials

    Metal part materials

    EN-GJL-250 grey cast iron or steel.

    Elastic tire materials

    Material

    Hardness

    Identification

    Ambient temperature

    Natural rubber

    70 ShoreA

    048

    -50 °C … +50 °C

    Chloroprene rubber

    70 ShoreA

    068 FRAS

    -15 °C … +70 °C



    ELPEX-B coupling types

    Type

    Description

    EBWN

    Coupling as a shaft-shaft connection with drilled and grooved hubs

    EBWT

    Coupling as a shaft-shaft connection with Taper clamping bushes

    EBWZ

    Coupling as shaft-shaft connection with detachable adapter



    Further application-specific coupling types are available; dimension sheets for and information on these are available on request.

    The coupling types set up for shaft-hub connections with Taper clamping bushes are designated as follows:

    • Variant A: Coupling with part 3 – part 3
    • Variant B: Coupling with part 4 – part 4
    • Variant AB: Coupling with part 3 – part 4

    In the case of part 3, the Taper clamping bush is screwed in from the shaft end face side. The coupling half must be fitted before the machines to be connected are pushed together.

    In the case of part 4, the Taper clamping bush is screwed in from the machine-housing side. If there is insufficient room, the Taper clamping bushes cannot be fitted from this side. Besides fitting space for the Taper clamping bush bolts, space for the fitting tool (offset screwdriver) must be taken into account.

    In the case of coupling type EBWT, part 3 and part 4 can be combined as required. Furthermore, the variant with a Taper clamping bush can be combined with the finish-drilled hub.

    Unfitted coupling

    The elastic tire can simply be slipped over the hub parts. The elastic tire is held firmly in place by fitting the clamping ring. The connection transmits the torque by frictional engagement.

    Fitted elastic tire

    Fitted coupling, shown without connecting shafts.

    Особенности

    The ELPEX-B coupling is suitable for horizontal and vertical mounting positions or mounting positions at any required angle.

    The elastic tire is slit at the circumference and can be changed without having to move the coupled machines.
    The elastic tire is fitted without backlash and gives the coupling linear torsional stiffness, thus the torsional rigidity remains constant as the load on the coupling increases.

    The ELPEX-B coupling is especially suitable for reversing operation or operation with changing directions of load. The coupling parts can be arranged as required on the shaft ends to be connected.

    If the elastic tire is irreparably damaged or worn, the metal parts can rotate freely against one another because they are not in contact with one another.

    Технические данные

    Power ratings

    Size

    Rated torque

    Maximum torque

    Overload torque

    Fatigue torque

    Maximum speed

    Dynamic torsional stiffness for 100 %
    load

    Permitted shaft misalignment
    at speed n = 1500 rpm 1)

           

    Axial

    Radial

    Angle

     

    TKN

    TKmax

    TK0L

    TKW

    nKmax

    CTdyn

    ΔKa

    ΔKr

    ΔKw

     

    Nm

    Nm

    Nm

    Nm

    rpm

    Nm/rad

    mm

    mm

    Degrees

    105

    24

    48

    72

    7

    4500

    285

    1.3

    1.1

    4

    135

    66

    132

    200

    20

    4500

    745

    1.7

    1.3

    4

    165

    125

    250

    375

    38

    4000

    1500

    2.0

    1.6

    4

    190

    250

    500

    750

    75

    3600

    2350

    2.3

    1.9

    4

    210

    380

    760

    1140

    114

    3100

    3600

    2.6

    2.1

    4

    235

    500

    1000

    1500

    150

    3000

    5200

    3.0

    2.4

    4

    255

    680

    1360

    2040

    204

    2600

    7200

    3.3

    2.6

    4

    280

    880

    1760

    2640

    264

    2300

    10000

    3.7

    2.9

    4

    315

    1350

    2700

    4050

    405

    2050

    17000

    4.0

    3.2

    4

    360

    2350

    4700

    7050

    705

    1800

    28000

    4.6

    3.7

    4

    400

    3800

    7600

    11400

    1140

    1600

    44500

    5.3

    4.2

    4

    470

    6300

    12600

    18900

    1890

    1500

    78500

    6.0

    4.8

    4

    510

    9300

    18600

    27900

    2790

    1300

    110000

    6.6

    5.3

    4

    560

    11500

    23000

    34500

    3450

    1100

    160000

    7.3

    5.8

    4

    630

    14500

    29000

    43500

    4350

    1000

    200000

    8.2

    6.6

    4



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

    Torsional stiffness and damping

    The damping coefficient is Ψ = 0.9

    The technical data for the elastic tires made of natural rubber and chloroprene rubber are virtually identical.

    Torsional stiffness depends 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 correction factors for different speeds are specified in the following table.
    The maximum speed for the respective coupling size must be observed!

    ΔKperm = ΔK1500 · FKV

     

    Speed in rpm

     

    500

    1000

    1500

    3000

    Correction factor FKV

    1.6

    1.25

    1.0

    0.70



    The restorative force (including in the axial direction) depends on speed, system torque and shaft misalignment. Restorative forces on request.