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Torsionally Rigid Couplings - SIPEX Series

  • Информационные материалы

    Информационные материалы

    SIPEX couplings are torsionally rigid and backlash-free. They are characterized by their compact design and high power density. SIPEX couplings connect machine shafts and compensate for shaft misalignment that can occur during assembly or operation.

    SIPEX couplings are suitable for all drive applications which require a coupling that offers positioning accuracy as well as a reliable, wear- and maintenance-free torque transmission.

    Область применения

    SIPEX couplings are available in 19 sizes within the standard catalog range, 7 of which are miniature versions and the other 12 standard designs. Rated torques range from 0.1 to 5000 Nm. The coupling is suitable for ambient temperatures of between -30 °C to +120 °C

    Couplings manufactured by alternative methods are available for higher ambient temperatures up to +250 °C.

    SIPEX couplings from the standard range are especially suitable for application in highly dynamic drives such as, for example, linear axes in machine tools, packaging machines or printing presses, or generally for automation technology.

    SIPEX couplings from the miniature range are designed for use in combination with rotary encoders, stepper motors or tachometers.

    Дизайн

    SIPEX couplings consist of two hub parts that are connected by means of bellows made of high-strength stainless steel.

    The hubs can be coupled to the shafts by many different methods including set screws, key joint, slotted clamping hubs, half-shell hubs, clamping hubs or expanding hubs.

    Thanks to their metal bellows, SIPEX couplings are torsionally rigid, but flexible. Misalignment between the connected shafts deforms the metal bellows.

    Coupling materials:

    Depending on the coupling version, hubs are made of aluminum (N, G, H) or steel (K, I), but stainless-steel variants are also optionally available.

    All the metal bellows are made of stainless steel and are available as single-wall or multiple-wall devices depending on size and application. Metal bellows come in various standard lengths.

    Metal bellows can be combined with different hub versions to create a complete unit. Once the hubs have been joined to metal bellows, they cannot be dismantled again.

    Hub versions:

    N: Hub with set screws
    G: Slotted clamping hub
    H: Half-shell clamping hub
    K: Clamping hub with external taper
    I: Clamping hub with internal taper
    S: Expanding hub

    Hubs are supplied as standard with bore tolerance H7 and without keyway.

    Versions N, G and H are optionally available with keyway in accordance with DIN 6885-1.

    The fitting tolerance of the coupled shaft ends should be g6 or h7.

    Versions of SIPEX couplings:

    Type

    Description

    SNN

    Hub with set screw on both sides

    SGG

    Slotted clamping hub on both sides

    SGG-A

    Slotted clamping hub - for axial plug-in

    SHH

    Half-shell clamping hub on both sides

    SKK

    Clamping hub with external taper on both sides

    SGS

    Hub 1: Slotted/Hub 2: Expanding hub

    SHH-W

    Drive shaft with half-shell clamping hubs

    SII

    Clamping hubs with internal taper on both sides



    Hub variants

    Set screw

    Clamping hub

    Axial plug-in

    Half-shell clamping hub

    External taper

    Internal taper

    Expanding hub

    Особенности

    SIPEX couplings are suitable for mounting horizontally, vertically or in any desired position. The coupling parts can be arranged as required on the shaft ends to be connected.

    The metal bellows are very torsional-resistant and combined with different clamping connections they ensure an absolutely angle-preserving torque transmission between the connected shafts. The moment of inertia is low.

    SIPEX couplings compensate axial, radial and angular shaft misalignment with only low restoring forces. SIPEX couplings are wear-free within their technical limits and therefore offer an unlimited service life.

    Технические данные

    Coupling dimensioning

    Dimensioning according to torque

    It must be ensured that the coupling is capable of safely transferring peak torques that regularly occur at the drive or load end. The service factor is provided in order to describe the deviation between the real coupling load and ideal load conditions:

    TKNTAS × FB or TLS × FB

    Torque characteristic of drive

    Service factor FB

    uniform

    1.5

    nonuniform

    2

    rough

    2.5 - 4

    Servomotors (machine tools)

    1.5 - 2



    Dimensioning according to acceleration torques

    The correct coupling size can be calculated more accurately on the basis of acceleration or deceleration torques because the peak torque at the coupling is reduced by the ratio between the moments of inertia on the drive and load ends:

    TKNTS × FB

    TS = TAS × JL : (JA + JL) or TS = TLS × JL : (JA + JL)

    Checking the maximum torsion angle

    If the application requires a maximum torsion angle of the coupling, the selected coupling size must be checked to ensure that it is sufficiently torsionally rigid for the application in question:

    φ = (180 : π) × (TS : CTdyn)

    Checking the maximum speed

    For all load situations nKmax > nmax

    Checking the permitted shaft misalignment

    The actual shaft misalignment must be less than the permitted shaft misalignment for all load situations.

    Checking the shaft-hub connection

    In the case of clamping connections without feather key, it must be ensured that the transmissible torque of the hub connection is greater than the peak torque at the coupling.

    Formula symbols

    Key to formula symbols

    Name

    Formula symbol

    Unit

    Explanation

    Rated coupling torque

    TKN

    Nm

    Torque which can be transmitted as static torque by the coupling over the period of use.

    Coupling overload torque

    TKOL

    Nm

    Torque which can be transmitted very rarely as maximum torque by the coupling.

    Peak torque at drive end

    TAS

    Nm

    Peak torque during non-periodic torque surges at drive end

    Peak torque at load end

    TLS

    Nm

    Peak torque during non-periodic torque surges at load end

    Peak torque

    TS

    Nm

    Peak torque at the coupling

    Service factor

    FB

     

    Factor that expresses the real coupling load as a ratio of the nominal coupling load

    Moment of inertia of drive end

    JA

    kgm2

    Sum of the moments of inertia at the drive end referred to the coupling speed

    Moment of inertia of load end

    JL

    kgm2

    Sum of the moments of inertia at the load end referred to the coupling speed

    Torsion angle

    φ

    °

    Torsion angle of the coupling under torsional load

    Torsional stiffness, dynamic

    CTdyn

    Nm/rad

    Dynamic torsional stiffness of the coupling

    Axial stiffness

    Ca

    N/mm

    Axial stiffness of the coupling

    Radial stiffness

    Cr

    N/mm

    Radial stiffness of the coupling

    Rated speed

    nN

    rpm

    Coupling speed

    Maximum coupling speed

    nKmax

    rpm

    Maximum permissible coupling speed

    Axial misalignment

    ΔKa

    mm

    Axial misalignment of the coupling halves

    Radial misalignment

    ΔKr

    mm

    Radial misalignment of the coupling halves

    Angular misalignment

    ΔKw

    °

    Angular misalignment of the coupling halves



    Technical specifications

    Power ratings of the miniature series

    Size

    Rated torque

    Maximum torque

    Maximum speed

    Torsional stiffness

    Stiffness

    Permitted shaft misalignment

         

    Radial

    Axial

       
     

    TKN

    TKOL

    nKmax

    CTdyn

    Cr

    Ca

    ΔKa

    ΔKr

    ΔKw

     

    Nm

    Nm

    rpm

    Nm/rad

    N/mm

    N/mm

    mm

    mm

    grad

    1

    0.1

    0.15

    15000

    65

    10

    14

    0.2

    0.1

    1.5

    5

    0.5

    0.75

    15000

    258

    128

    18

    0.2

    0.1

    1.5

    195

    54

    13

    0.3

    0.2

    1.5

    160

    26

    11

    0.4

    0.2

    2

    10

    1

    1.5

    15000

    510

    187

    36

    0.2

    0.1

    1.5

    380

    82

    27

    0.3

    0.2

    1.5

    308

    42

    22

    0.4

    0.2

    2

    15

    1.5

    2.25

    15000

    750

    139

    23

    0.3

    0.1

    1.5

    700

    81

    12

    0.4

    0.2

    2

    20

    2

    3

    15000

    1510

    147

    18

    0.3

    0.2

    1.5

    1300

    96

    14

    0.4

    0.2

    1.5

    1040

    46

    9

    0.5

    0.3

    2

    45

    4.5

    6.75

    15000

    6480

    444

    47

    0.3

    0.1

    1.5

    4100

    108

    29

    0.5

    0.2

    2

    100

    10

    15

    15000

    8080

    361

    46

    0.4

    0.2

    1.5

    6750

    193

    34

    0.6

    0.3

    2



    Power ratings of the standard series

    Size

    Rated torque

    Maximum torque

    Maximum speed

    Torsional stiffness

    Stiffness

    Permitted shaft misalignment

         

    Radial

    Axial

       
     

    TKN

    TKOL

    nKmax

    CTdyn

    Cr

    Ca

    ΔKa

    ΔKr

    ΔKw

     

    Nm

    Nm

    rpm

    Nm/rad

    N/mm

    N/mm

    mm

    mm

    grad

    18

    18

    27

    12800

    19

    200

    50

    0.5

    0.2

    1.5

    17

    85

    40

    0.5

    0.2

    2.0

    30

    30

    45

    10300

    36

    720

    50

    0.5

    0.2

    1.5

    26

    220

    30

    0.8

    0.2

    2.0

    60

    60

    90

    8700

    75

    1100

    90

    0.5

    0.2

    1.5

    50

    330

    55

    0.8

    0.2

    2.0

    80

    80

    120

    6900

    128

    1200

    80

    0.5

    0.2

    1.5

    75

    400

    55

    0.7

    0.2

    2.0

    150

    150

    225

    6900

    155

    2000

    150

    0.5

    0.2

    1.5

    102

    600

    85

    0.6

    0.2

    2.0

    200

    200

    300

    6400

    175

    2500

    150

    0.5

    0.2

    1.5

    120

    450

    85

    0.7

    0.2

    2.0

    300

    300

    450

    6000

    502

    6300

    280

    0.5

    0.2

    1.5

    282

    1500

    85

    0.7

    0.2

    2.0

    500

    500

    750

    5000

    690

    8800

    100

    0.5

    0.2

    1.5

    315

    1000

    85

    0.8

    0.2

    2.0

    800

    800

    1200

    3700

    760

    510

    190

    0.8

    0.2

    1.8

    1400

    1400

    2100

    3700

    1300

    710

    280

    0.8

    0.2

    1.8

    3000

    3000

    4500

    2800

    2800

    8060

    880

    0.8

    0.2

    1.5

    5000

    5000

    7500

    2800

    4800

    9190

    740

    0.8

    0.2

    1.5



    Permitted shaft misalignment

    The permitted shaft misalignments ΔKa, ΔKr und ΔKw are maximum values and must not occur simultaneously. The following formula can be used to roughly calculate whether combinations of misalignments are permissible:

    (ΔKract : ΔKr) + (ΔKaact : ΔKa) + (ΔKwact : ΔKw) < 1

    The different torsional stiffness values apply to the various lengths of metal bellows of the relevant SIPEX type.