HKS / HKSI 5 Safety Single-joint Couplings

Description

HKS / HKSI 5…

Safety single joint couplings

For encoder attachments requiring functional safety (PL e)
Play-free, torsion resistant and failsafe
Extends service life of encoders
Options: Isolated version (HKSI 5) or Ex certified version (HKS 5 Ex)

Description

Safety single joint couplings

Corrosion proof HKS metal multiple disc couplings compensate an angular offset up to 0.5° and an axial misalignment up to ±1 mm as well as extending the service life of encoders in the process. They are safety components in accordance with DIN EN ISO 13849-2 (PL e) with CE declaration of conformity and designed in high safety factors relating to fatigue resistance and fault exclusion. In addition, it is possible to implement failsafe encoder attachment solutions in potentially explosive atmospheres. As a consequence, they are ideal for extreme operating conditions. Single joint couplings are available with different hub lengths and bore diameters in addition to isolated coupling versions for attachments where the risk of shaft currents is a concern.

Technical Data

Product usage	Compensate axial misalignment Compensate angular offset Attachment points with functional safety requirement (SIL/PL) Attachment points in potentially explosive atmospheres (ATEX / IECEx) Isolate against existing bearing/shaft currents
Coupling specification	HKS 5… / HKS 5… Ex: Stainless steel coupling HKSI 5…: Stainless steel coupling with plastic isolating bushing (electrically isolated)
Bore drive side	Max. Ø 22 mm with keyway
Bore encoder side	HKS 5… / HKS 5… Ex: Max. Ø 22 mm with keyway HKSI 5…: Max. Ø 10-14 mm with keyway (plastic isolating bushing)
Outer diameter	Ø 54 mm
Total length	52 – 68 mm
Mounting accuracy	Angular offset: up to 0.5° / axial misalignment: up to ±1 mm
Maximum rotation	6000 rpm
Temperature range	HKS 5…: -50 °C to +120 °C HKSI 5…: -25 °C to +85 °C HKS 5… Ex: -50 °C to +70 °C
Shock resistance	10 g (briefly 100 g)
Vibration resistance	3 g (briefly 20 g)
Insulated against currents	HKS 5… / HKS 5… Ex: No HKSI 5…: Yes
Mechanical options	Isolation against bearing/shaft currents (type HKSI) Attachment to larger shaft diameters possible with adapter shaft
Special features and certificates	Designed as safety component with fault exclusion to DIN EN ISO 13849-2 (up to PLe), with CE declaration of conformity Additional safety claws ensure availability even if spring washers fracture due to overload Spring washers made of high tensile steel with special corrosion protection Certified for Ex zones 1 and 2 (gas) as well as 21 and 22 (dust); isolated version type HKSI 5… not available for Ex applications due to the risk of build-up of electrostatic charge (plastic).