What the SICK KUP-1012-J Claw Coupling Does

The SICK KUP-1012-J is a claw (jaw) shaft coupling with a blue polyurethane damping element, designed to link an encoder shaft to a drive shaft. It provides a 10 mm bore on the encoder side and a 12 mm bore on the drive side, with a maximum torque capacity of 8 N·m. For engineers specifying motion feedback in rugged oil and gas environments, this coupling is a field-proven interface between the encoder and the machine.

Why Specify This unit for Encoder Shaft Adaptation?

Misalignment between an encoder shaft and the drive shaft is a common source of premature encoder failure. This unit addresses this by compensating for axial, radial, and angular offsets while transmitting torque through a flexible polyurethane element. The aluminum flange provides a rigid mounting base, and the 80 Shore blue damping element absorbs shock and vibration that would otherwise reach the encoder bearings.

Because the coupling is part of SICK's shaft adaptation series, it is engineered to match SICK encoder shaft dimensions. The result is a dependable mechanical link that protects mission-critical feedback signals in demanding environments.

Key Features and Technical Specifications

• Coupling type: Claw coupling with polyurethane damping element.
• Bore diameter (encoder side, D1): 10 mm.
• Bore diameter (drive side, D2): 12 mm.
• Material: Aluminum flange and polyurethane damping element (80 Shore, blue).
• Nominal torque: 8 N·m maximum (800 Ncm per datasheet).
• Maximum speed: 19,000 rpm; maximum angle of twist 10°.
• Axial offset compensation: ±1 mm maximum.
• Radial offset compensation: ±0.22 mm maximum; angular offset ±1.3° maximum.
• Fastening: Socket set screws per ISO 4029; tightening torque 150 Ncm maximum.
• Operating temperature: –30 °C to +80 °C.
• Overall length: 28.5 mm (J family).

These parameters make This unit suitable for applications where space is limited and misalignment must be managed without sacrificing torque transmission. The maximum speed of 19,000 rpm supports high-speed encoder feedback, while the temperature range covers typical outdoor and process-area conditions in oil and gas facilities.

Installation and Setup Guidance

Proper installation is essential to realize the coupling's compensation capabilities. First, verify that the encoder shaft diameter matches the 10 mm bore and the drive shaft matches the 12 mm bore. Then, align the shafts as closely as possible before tightening the socket set screws to 150 Ncm maximum. Over-tightening can damage the aluminum flange or strip the screw threads.

After mounting, check that the axial offset does not exceed ±1 mm, radial offset does not exceed ±0.22 mm, and angular offset does not exceed ±1.3°. Exceeding these limits will reduce coupling life and may transmit excessive force to the encoder bearings. Finally, confirm that the operating temperature remains within –30 °C to +80 °C during operation.

Maintenance and Reliability in Oil and Gas Environments

The polyurethane damping element is the primary wear component. In demanding environments, inspect the coupling periodically for signs of cracking, discoloration, or material loss. Also check the set screws for tightness, as vibration can loosen them over time. Because the coupling compensates for misalignment, it reduces radial loads on the encoder shaft, which extends encoder bearing life and supports reliability you can depend on.

When replacing an encoder or drive component, always inspect the coupling for wear and replace it if necessary. A worn coupling can introduce backlash or vibration that compromises feedback accuracy. For mission-critical operations, keeping a spare coupling on hand minimizes downtime.

Compatibility and Integration Notes

This unit is designed for SICK encoders with a 10 mm shaft and drive shafts with a 12 mm diameter. It is a mechanical accessory and does not include electrical connections. If the encoder is part of a fieldbus network, wiring may require an external gateway or connection module. Confirm cable and gateway compatibility with your supplier before commissioning.

Frequently Asked Questions

What is the operating temperature range of the SICK unit?

The SICK unit operates from –30 °C to +80 °C, as stated in the datasheet. This range suits many outdoor and process-area installations in oil and gas facilities.

Can This unit compensate for shaft misalignment?

Yes. It accommodates up to ±1 mm axial offset, ±0.22 mm radial offset, and ±1.3° angular offset. These values are maximums; aligning shafts as closely as possible improves coupling life.

What is the maximum torque and speed of this coupling?

This unit has a maximum torque capacity of 8 N·m (800 Ncm) and a maximum speed of 19,000 rpm. The maximum angle of twist is 10°.

Is This unit a suitable servo motor replacement part?

This unit is a shaft coupling for encoders, not a servo motor. For servo motor replacement or VFD parts, contact PetroPartsOnline to discuss your application requirements.

What is the tightening torque for the clamping screws?

Tighten the socket set screws per ISO 4029 to a maximum of 150 Ncm. Do not exceed this value to avoid damaging the coupling.

Contact PetroPartsOnline for parts suited to your application's requirements.

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