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Flexible couplings RUPEX series

  • Информационные материалы

    Информационные материалы

    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

    RUPEX pin and bush couplings link machine shafts and compensate for shaft misalignment with weak restorative forces.
    The torque is conducted through elastomer buffers, so the coupling has typically flexible rubber properties.
    Thanks to their robust design, RUPEX couplings are also suitable for rough operating conditions.

    Область применения

    RUPEX couplings are available as a catalog standard in 26 sizes with a rated torque of between 200 Nm and 1300000 Nm.

    The coupling is suitable for ambient temperatures of between –30 °C and +80 °C. By using alternative elastomer buffers the ambient temperature range can be extended to between –50 °C and +100 °C.

    Frequently, the coupling is used to connect the gear shaft to the driven machine. In the case of drives without gear units, the coupling is particularly suitable for operation in rough conditions or heavy-duty drives with electric motor drive. Ventilator drives with high ventilator mass and drives in the cement industry are typical applications.

    Examples of particularly safety-relevant areas of application are cable railway drives, lifting gear for crane drives or escalator drives.

    Дизайн

    A RUPEX coupling comprises two hub sections which are mounted on the machine shafts. The hub parts are connected positively by steel pins and elastomer buffers. The coupling can be fitted with add-on parts such as brake disks or brake drums. Up to size 360, the pins and buffers are fitted on one side. From size 400 up, the pins and buffers are fitted in the hubs on alternate sides.

    Materials

    Hubs

    • Type RWN and RWB made of grey cast iron EN-GJL-250
    • Types RWS and RBS made of steel

    Flange

    Types RFN, RFS made of steel

    Pin

    Material steel 42CrMo4, surface fine-machined

    Buffer material

    Material/description

    Hardness

    Identification

    Ambient temperature

    NBR standard type

    80 ShoreA

    Buffer black

    –30 °C ... +80 °C

    NBR electrically insulating

    80 ShoreA

    Buffer green

    –30 °C ... +80 °C

    NBR soft

    60 ShoreA

    Buffer black with green dot

    –30 °C ... +80 °C

    NBR hard

    90 ShoreA

    Buffer black with magenta dot

    –30 °C ... +80 °C

    NR for low temperature

    80 ShoreA

    Buffer black with white dot

    –50 °C ... +50 °C

    HNBR high temperature

    80 ShoreA

    Buffer black with red dot

    –10 °C ... +100 °C



    Brake disks

    • Type RWB made of EN-GJS-400 spheroidal graphite cast iron
    • Type RBS made of steel

    Brake drums

    • Type RWB made of EN-GJL-250 grey cast iron
    • Type RBS made of steel

    RUPEX pin and bush coupling types

    Type

    Description

    RWN

    Coupling made of grey cast iron

    RWS

    Coupling made of steel

    RWB

    Coupling made of grey cast iron with brake drum or brake disk

    RBS

    Coupling made of steel with brake drum or brake disk

    RFN

    Coupling made of grey cast iron in flange-shaft variant

    RFS

    Coupling made of steel in flange-shaft variant



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

    RUPEX pin and bush coupling types on request

    Type

    Description

    All

    Coupling with axial backlash limitation

    All

    Coupling with pretensioned buffers

    All

    Coupling with lengthened pins and spacer sleeves

    RKS

    Coupling for engaging/disengaging during standstill

    RWNH, RWSH

    Coupling with extension piece

    RBM

    Coupling with lengthened pins for sliding rotor motors

    RAK

    Coupling combination RUPEX with ARPEX all-steel membrane coupling



    Types RWN/RWS – One-sided arrangement of pins and buffers

    Types RWN/RWS – Alternate-sided arrangement of pins and buffers

    Types RWB/RBS with brake drum

    Types RWB/RBS with brake disk

    Types RFN, RFS

    Функции

    The motor torque is transmitted to the hub on the drive side via the shaft-hub connection, which is mostly designed as a keyway connection. With the aid of elastomer buffers mounted on steel pins, the torque is conducted to the hub on the output side.

    The hub on the output side further transmits the torque to the driven machine or a gear unit located in between. Because of the primarily compression-loaded buffers, the coupling has a progressive torsional stiffness.

    Особенности

    RUPEX couplings can also hold loads when overloaded and are therefore especially suitable for drives for special safety and reliability requirements.

    Torque shock loads and changing loads are no problem for robust, compact flexible RUPEX couplings.

    The steel variant is also especially suitable for high-speed drives.

    RUPEX couplings are fitted by putting together the coupling halves. Fitting with low torsional backlash is simplified by the barrel-shaped geometry of the buffers.

    RUPEX couplings require little maintenance. Only the elastomer buffers, as wear parts, need be replaced and the coupled machines need not be moved to do so.

    RUPEX couplings are suitable for reversing operation and horizontal and vertical fitting or fitting at any required angle.

    Технические данные

    Power ratings

    Size

    Rated torque for buffer type

    Torsional stiffness at 50 %
    capacity utilization for buffer type

    Assembly

    Permitted shaft misalignment at speed n = 1500 rpm1)

     

    65 ShoreA

    80 ShoreA

    90 ShoreA

    65 ShoreA

    80 ShoreA

    90 ShoreA

    Gap dimension

    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

    Degree

    105

    120

    200

    200

    5

    13

    21

    1.0

    0.2

    0.2

    0.11

    125

    210

    350

    350

    9

    25

    37

    1.0

    0.2

    0.2

    0.10

    144

    300

    500

    500

    15

    43

    64

    1.0

    0.23

    0.23

    0.09

    162

    450

    750

    750

    20

    55

    83

    1.5

    0.25

    0.25

    0.09

    178

    570

    950

    950

    31

    85

    130

    1.5

    0.27

    0.27

    0.09

    198

    780

    1300

    1300

    43

    123

    187

    1.5

    0.29

    0.29

    0.08

    228

    1300

    2200

    2200

    65

    184

    270

    1.5

    0.3

    0.3

    0.08

    252

    1650

    2750

    2750

    92

    256

    380

    1.5

    0.34

    0.34

    0.08

    285

    2600

    4300

    4300

    141

    390

    560

    1.5

    0.36

    0.36

    0.07

    320

    3300

    5500

    5500

    195

    540

    790

    1.5

    0.4

    0.4

    0.07

    360

    4700

    7800

    7800

    276

    610

    940

    1.5

    0.43

    0.43

    0.07

    400

    7500

    12500

    12500

    410

    1130

    1710

    1.5

    0.48

    0.48

    0.07

    450

    11000

    18500

    18500

    570

    1600

    2380

    1.5

    0.52

    0.52

    0.07

    500

    15000

    25000

    25000

    860

    2350

    3600

    1.5

    0.57

    0.57

    0.07

    560

    23500

    39000

    39000

    1130

    3070

    4700

    2.0

    0.62

    0.62

    0.06

    630

    31000

    52000

    52000

    1640

    4600

    7400

    2.0

    0.68

    0.68

    0.06

    710

    50000

    84000

    84000

    2560

    7200

    10900

    2.0

    0.75

    0.75

    0.06

    800

    66000

    110000

    110000

    3900

    10700

    16700

    2.0

    0.84

    0.84

    0.06

    900

    90000

    150000

    150000

    5200

    14300

    22500

    2.5

    0.93

    0.93

    0.06

    1000

    115000

    195000

    195000

    7700

    21300

    33000

    2.5

    1.03

    1.03

    0.06

    1120

    160000

    270000

    270000

    9800

    27300

    44000

    2.5

    1.14

    1.14

    0.06

    1250

    205000

    345000

    345000

    14000

    39000

    62000

    2.5

    1.26

    1.26

    0.06

    1400

    320000

    530000

    530000

    22800

    62000

    97000

    3.0

    1.39

    1.39

    0.06

    1600

    450000

    750000

    750000

    37000

    103000

    160000

    3.0

    1.55

    1.55

    0.06

    1800

    585000

    975000

    975000

    48000

    133000

    208000

    4.0

    1.76

    1.76

    0.06

    2000

    780000

    1300000

    1300000

    73000

    201000

    314000

    4.0

    2.17

    2.17

    0.06



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

    All product codes listed below apply to standard buffers of NBR material in the 80 ShoreA variant.

    For maximum coupling torque:
    TKmax = 3.0 · TKN

    For overload torque:
    TKOL = 4 · TKN

    For coupling fatigue torque:
    TKW = 0.20 · TKN

    The axial misalignment may occur dynamically at frequencies up to 10Hz.

    For fitting, a maximum gap dimension of Smax = S + ΔS and a minimum gap dimension of Smin = S – ΔS are permitted.

    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 TNTKN

     

    20 %

    40 %

    50 %

    60 %

    70 %

    80 %

    90 %

    100 %

    Correction factor FKC
    65/80/90 Shore A

    0.51

    0.83

    1.00

    1.18

    1.38

    1.58

    1.80

    2.03



    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 and type must be observed!

    ΔKperm = ΔK1500  · FKV

     

    Speed in rpm

     

    500

    1000

    1500

    3000

    Correction factor FKV

    1.60

    1.20

    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 are permitted.

    Shaft misalignments ΔKa, ΔKr and ΔKw may occur simultaneously.