GS 19 - AXIS GS Couplings

GS standard types - For size 5 to 38 hub material aluminium/for size 42 to 90 hub material steel
Size	Spider GS ¹⁾ torque T_KN [Nm]			D_max. for hub type			Dimensions [mm]										Setscrew DIN EN ISO 4029
Size	98 ShA	57 ShD	64 ShD	1.0	1.1	1.2	DN	DH	DI1	L	L1, L2	M, N	E	B1	S	A	G	T	TA [Nm]
19	21	23	26	24	–	–	–	40	18	66	25	–	16	12	2.0	3.0	M 5	10	2.0

The GS 19 Coupling (Size 19) is a robust, zero-backlash flexible coupling designed for high-performance servo drives and positioning systems. With an outer diameter of 40mm, the GS 19 offers a significant step up in torque capacity compared to smaller sizes, handling up to 21 Nm of nominal torque.

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Key Specifications (Model GS 19)

The GS 19 is a standard size for medium-duty servo applications. Below are the typical technical specifications:

Parameter	Value
Coupling Size	GS 19 (Size 19)
Nominal Torque	10.0 Nm (92 ShA Yellow) / 17.0 Nm (98 ShA Red) / 21.0 Nm (64 ShD Green)
Max. Torque (Peak)	20.0 Nm to 42.0 Nm (approx. 2x Nominal)
Max. Rotational Speed	Up to 19,000 RPM (Standard Hubs) / Higher with balancing
Bore Range	6 mm to 20 mm (Standard) / 24 mm (Max)
Outer Diameter	40 mm
Hub Material	High-Strength Aluminum (Steel options available)

How It Works

The GS 19 uses a pre-tensioned design to ensure backlash-free operation:

Zero Backlash fit: The elastomeric spider is dimensionally slightly larger than the precision-machined jaws of the hubs. Upon assembly, the spider is compressed, creating a tight interference fit that eliminates all mechanical clearance.
Torque Transmission: The concave jaw profile ensures that contact pressure is distributed evenly across the spider teeth. This allows the coupling to transmit high torque loads while maintaining high torsional stiffness.
Vibration Damping: The internal spider acts as a mechanical filter, absorbing torsional vibrations and shock loads from the motor, protecting downstream components like ball screws and gearboxes.

Benefits of GS 19 Couplings

High Torque Capacity: Capable of transmitting up to 21 Nm (nominal) in a compact 40mm diameter, providing excellent power density for servo drives.
Positioning Accuracy: The zero-backlash connection ensures precise repeatability, which is critical for CNC machining centers and automated positioning stages.
Electrical Isolation: The non-conductive polyurethane spider electrically isolates the driving and driven shafts, preventing ground loops that can interfere with sensitive encoders.
Easy Installation: The axial "plug-in" design allows for blind assembly, making installation easy even in confined spaces or bell housings.
Tunable Damping: By selecting different spider hardness levels (e.g., 92 Shore A for damping, 98 Shore A for stiffness), engineers can optimize the drive system's dynamic behavior.

Typical Applications

The GS 19 is widely used in industrial automation and precision manufacturing:

CNC Machines: Main spindle drives and feed axis drives in milling machines and lathes.
Packaging Technology: Servo-driven labeling, filling, and carton erecting machines.
Linear Motion: Coupling servo motors to precision ball screws and linear actuators.
Robotics: Joint actuators for industrial robots and automated grippers.
Test Benches: Precision torque measurement and dynamometer connections.

Summary

The GS 19 Backlash-Free Coupling is the standard for high-performance servo applications requiring torque up to 21 Nm. Its compact 40mm design combines high stiffness with vibration damping and zero backlash, ensuring the accuracy and reliability demanded by modern automation systems. Whether in a CNC machine or a robotic arm, the GS 19 delivers precise motion control.