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SIPEX Backlash free Coupling high performance

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.

product details

Benefits

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.

Application

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.

Design and configurations

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, halfshell 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

Hub Description

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

SHH-W Drive shaft with half-shell clamping hubs

SII Clamping hubs with internal taper on both sides

SGS Hub 1: Slotted, Hub 2: Expanding hub

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:

TKN ≥ TAS ⋅ FB or TLS ⋅ FB

Torque characteristic of drive Service factor FB

Uniform 1.5

Non Uniform 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:

Coupling dimensioning

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:

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.