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Flexible Couplings - BIPEX-S Series

  • Информационные материалы

    Информационные материалы

    BIPEX-S couplings are torsionally flexible and are free of backlash in the pretensioned state. They are characterized by their compact design and high power density. BIPEX-S couplings connect machine shafts and compensate for shaft misalignment that can occur during assembly or operation. The damping properties of the couplings can be varied by the use of cam rings made of elastomer of various degrees of hardness.

    BIPEX-S couplings are suitable for all drive applications which require a coupling that offers positioning accuracy and vibration damping.

    Область применения

    BIPEX-S couplings within the standard catalog range are available in 10 sizes with torque ratings ranging from 0.5 to 655 Nm. The coupling is suitable for ambient temperatures of between -30 °C and +90 °C. Cam rings with alternative hardness grades can be supplied for ambient temperatures down to -50 °C or up to +120 °C.

    BIPEX-S couplings are ideal for use in servo drives, linear axes or rotary encoders of the type typically deployed in machine tools, packaging machines or printing presses.

    Дизайн

    BIPEX-S couplings each comprise two hub parts connected by a cam ring made of polyurethane (PU).

    The couplings can be axially plugged in during assembly. 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.

    BIPEX-S couplings are positive-locking and torsionally flexible thanks to the polyurethane cam ring. Misalignment between the connected shafts deforms the cam ring.

    Coupling materials:

    Hubs:
    Up to size 38 aluminum
    Sizes 42 and 48 steel

    Cam ring:
    PU 80 ShoreA -50 °C to +80 °C
    PU 92 ShoreA -40 °C to +90 °C
    PU 98 ShoreA -30 °C to +90 °C
    (standard ring)
    PU 64 ShoreD -50 °C to +120 °C

    The coupling types can be combined from the available range of hub versions and different elastomer grades.

    Hub versions:

    N: Hub with set screw
    G: Slotted clamping hub
    C: Slotted clamping hub, compakt
    H: Half-shell clamping hub
    K: Clamping hub with external taper
    S: Expanding hub

    Versions N, G, C and H are optionally available with keyway.

    BIPEX-S coupling versions

    Type

    Description

    BNN 1)

    Hub with set screw on both sides

    BGG 1)

    Clamping hub on both sides

    BCC 1)

    Compact clamping hub on both sides

    BHH 1)

    Half-shell clamping hubs on both sides

    BKK 1)

    Clamping hub with external taper on both sides

    BCS 1)

    Hub 1: Clamping hub/Hub 2: Expanding hub

    BHH-W 1)

    Drive shaft with half-shell clamping hub

    BNG

    Hub 1: Set screw/Hub 2: Clamping hub

    BNC

    Hub 1: Set screw/Hub 2: Compact cl. hub

    BNH

    Hub 1: Set screw/Hub 2: Half-shell

    BNK

    Hub 1: Set screw/Hub 2: External taper

    BGC

    Hub 1: Clamping hub/Hub 2: Compact cl. hub

    BGH

    Hub 1: Clamping hub/Hub 2: Half-shell

    BGK

    Hub 1: Clamping hub/Hub 2: External taper

    BGS

    Hub 1: Clamping hub/Hub 2: Expanding hub

    BCH

    Hub 1: Cl. hub compact/Hub 2: Half-shell

    BCK

    Hub 1: Cl. hub compact/Hub 2: External taper

    BHK

    Hub 1: Half-shell/Hub 2: External taper

    BHS

    Hub 1: Expanding hub/Hub 2: Half-shell

    BKS

    Hub 1: Expanding hub/Hub 2: External taper



    1) Standard version

    Hub variants

    Set screw

    Clamping hub

    Compact camping hub

    Half-shell clamping hub

    External taper

    Expanding hub

    Cam rings

    98 ShoreA (red) 92 ShoreA (yellow) 80 ShoreA (blue) 64 ShoreD (green)

    Особенности

    BIPEX-S 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 coupling can be axially plugged in.

    The cam ring is pretensioned and is therefore assembled without backlash. The cams attached to the cam ring allow the coupling to compensate shaft misalignment, and also provide electrical isolation since they prevent contact between the two hub parts.

    BIPEX-S couplings are fail-safe. When the cam ring is worn, the claws of the coupling hubs provide for fail-safe operation.

    Available in 4 different Shore hardness grades, the cam rings allow to select the optimum degree of rigidity for any application.

    Технические данные

    Preliminary dimensioning

    Dimensioning according to torque

    The coupling must be dimensioned such that the rated torque of the drive including service factors does not exceed the rated torque of the coupling:

    TKNTN × FB × FT

    Torque characteristic

    Service factor FB

    Uniform

    1.25

    Nonuniform

    1.5

    Rough

    2.0



    In order to increase the torsional rigidity and therefore minimize the torsional backlash, it is possible to apply significantly higher service factors for main spindle or positioning drives.

    Temperature range

    Temperature factor FT

    -30 °C to +30 °C

    1.0

    to +60 °C

    1.4

    to +80 °C

    1.8

    to +100 °C

    2.0

    to +120 °C

    2.8



    Note:

    Please note the permissible temperature ranges of different cam rings.

    Starts per hour

    Startup factor FA

    < 125

    1.0

    125 to 250

    1.3

    250 to 500

    1.6

    500 to 1000

    1.8

    > 1000

    2.0



    Checking the peak torques

    The coupling size selected during the preliminary dimensioning process must also be suitable with respect to peak torques at the drive and load ends:

    TKNTS × FB × FT

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

    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 symbols

    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

    Temperature factor

    FT

     

    Factor that takes into account the reduction in strength of flexible rubber materials at higher temperatures

    Startup factor

    FA

     

    Factor that takes into account additional loading as a function of starting frequency

    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



    Power ratings

    Size

    Shore hardness

    Rated torque

    Maximum torque

    Maximum speed

    Maximum speed

    Maximum speed

    Torsional stiffness

    Radial stiffness

    Permitted shaft misalignment

    Type

    Type

    Type

    BNN

    BGG, BHH, BCC, BCS

    BKK

    TKN

    TKOL

    nKmax

    nKmax

    nKmax

    CTdyn

    Cr

    ΔKa

    ΔKr

    ΔKw

    Nm

    Nm

    rmp

    rmp

    rmp

    Nm/rad

    N/mm

    mm

    mm

    degrees

    5

    80 ShoreA

    0.3

    0.6

    47500

    38000

    -

    10

    82

    0.4

    0.12

    1.1

    92 ShoreA

    0.5

    1.0

    16

    154

    0.4

    0.06

    1

    98 ShoreA

    0.9

    1.8

    25

    296

    0.4

    0.04

    0.9

    7

    80 ShoreA

    0.7

    1.4

    35000

    26000

    -

    26

    114

    0.6

    0.15

    1.1

    92 ShoreA

    1.2

    2.4

    43

    219

    0.6

    0.1

    1

    98 ShoreA

    2.0

    4.0

    69

    421

    0.6

    0.06

    0.9

    64 ShoreD

    2.4

    4.8

    103

    630

    0.6

    0.04

    0.8

    9

    80 ShoreA

    1.8

    3.6

    24000

    18000

    -

    52

    125

    0.8

    0.19

    1.1

    92 ShoreA

    3.0

    6

    95

    262

    0.8

    0.13

    1

    98 ShoreA

    5.0

    10

    155

    518

    0.8

    0.08

    0.9

    64 ShoreD

    6.0

    12

    224

    769

    0.8

    0.05

    0.8

    14

    80 ShoreA

    4.0

    8

    16000

    12000

    25000

    180

    153

    1

    0.21

    1.1

    92 ShoreA

    7.5

    15

    344

    335

    1

    0.15

    1

    98 ShoreA

    12.5

    25

    513

    655

    1

    0.09

    0.9

    64 ShoreD

    16

    32

    702

    855

    1

    0.06

    0.8

    19

    80 ShoreA

    5

    10

    12000

    9500

    18500

    1030

    582

    1.2

    0.15

    1.1

    92 ShoreA

    10

    20

    1720

    1125

    1.2

    0.1

    1

    98 ShoreA

    17

    34

    2580

    2010

    1.2

    0.06

    0.9

    64 ShoreD

    21

    42

    3720

    2950

    1.2

    0.04

    0.8

    24

    92 ShoreA

    35

    70

    8700

    7000

    13900

    4300

    1490

    1.4

    0.14

    1

    98 ShoreA

    60

    120

    6190

    2550

    1.4

    0.1

    0.9

    64 ShoreD

    75

    150

    8930

    3695

    1.4

    0.07

    0.8

    28

    92 ShoreA

    95

    190

    7400

    6000

    11800

    6880

    1785

    1.5

    0.15

    1

    98 ShoreA

    160

    320

    10310

    3210

    1.5

    0.11

    0.9

    64 ShoreD

    200

    400

    13050

    4350

    1.5

    0.08

    0.8

    38

    92 ShoreA

    190

    380

    6000

    4700

    9600

    13750

    2350

    1.8

    0.17

    1

    98 ShoreA

    325

    650

    21490

    4410

    1.8

    0.12

    0.9

    64 ShoreD

    405

    810

    31620

    6475

    1.8

    0.09

    0.8

    42

    92 ShoreA

    265

    530

    5000

    4000

    8000

    24300

    2440

    2

    0.19

    1

    98 ShoreA

    450

    900

    48000

    5575

    2

    0.14

    0.9

    64 ShoreD

    560

    1120

    71700

    7280

    2

    0.1

    0.8

    48

    92 ShoreA

    310

    620

    4600

    3500

    7100

    18055

    2590

    2.1

    0.23

    1

    98 ShoreA

    525

    1050

    55925

    5950

    2.1

    0.16

    0.9

    64 ShoreD

    655

    1310

    90500

    8280

    2.1

    0.11

    0.8



    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 a frequency of 10 Hz and an ambient temperature of 20 °C. The dynamic torsional stiffness is load-dependent and increases in proportion to capacity utilization..

    The relative damping coefficient is
    ψ = 0.8 for 98, 92 and 80 ShA
    ψ = 0.75 for 64 ShD.

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

    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