GS 14 - 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]
14	12.5	–	16	16	16	16	–	30	10.5	35	11	–	13	10	1.5	2.0	M 4	5.0	1.5

The GS 14 Coupling (Size 14) is a highly versatile, zero-backlash flexible coupling used extensively in high-speed automation and precision drive systems. With an outer diameter of 30mm, it bridges the gap between miniature couplings and larger industrial servo couplings, offering a robust torque capacity of up to 12.5 Nm.

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Key Specifications (Model GS 14)

The GS 14 is a standard choice for NEMA 34 motors and similar frame sizes. Below are the technical specifications:

Parameter	Value
Coupling Size	GS 14 (Size 14)
Nominal Torque	7.5 Nm (92 ShA Yellow) / 12.5 Nm (98 ShA Red)
Max. Torque (Peak)	15.0 Nm to 25.0 Nm (approx. 2x Nominal)
Max. Rotational Speed	Up to 32,000 RPM (Hub Dependent)
Bore Range	6 mm to 16 mm (Standard)
Outer Diameter	30 mm
Hub Material	High-Strength Aluminum

How It Works

The GS 14 relies on a pre-tensioned elastomer design to ensure zero backlash:

Backlash Elimination: The polyurethane spider is dimensionally slightly larger than the precision-machined jaws of the aluminum hubs. During assembly, the spider is compressed into the jaws, creating a tight interference fit that removes all clearance.
Torque Transmission: The concave jaw profile concentrates the compression load toward the center of the spider teeth. This allows the coupling to transmit high torque loads while maintaining stiffness during reversing operations.
Vibration Damping: The elastomeric insert acts as a buffer, absorbing torsional vibration and shock loads from the motor, which protects the ball screw or gearbox from resonance and wear.

Benefits of GS 14 Couplings

High Speed Capability: With a balanced aluminum design, the GS 14 can operate at speeds up to 32,000 RPM, making it suitable for high-speed spindles and centrifuges.
Positioning Accuracy: The zero-backlash connection ensures high repeatability, critical for CNC machining centers and robotic arms.
Electrical Isolation: The non-conductive spider electrically isolates the motor shaft from the driven load, preventing ground loops that can damage encoders.
Easy Installation: The axial "plug-in" assembly allows for blind installation in difficult-to-reach areas, such as inside motor housings.
Customizable Performance: Users can select different spider hardness levels (e.g., 92 Shore A for damping, 98 Shore A for stiffness) to tune the coupling's performance to the application.

Typical Applications

The GS 14 is widely used in precision industrial automation:

Machine Tools: Main spindle drives and axis feed drives in CNC lathes and mills.
Packaging Machinery: High-speed labeling and filling machines.
Linear Technology: Coupling servo motors to precision ball screws and belt actuators.
Robotics: Joint drives for collaborative robots (cobots) and Cartesian robots.
Medical Equipment: Centrifuges and automated diagnostic machines.

Summary

The GS 14 Backlash-Free Coupling is a high-performance solution for engineers demanding precision and speed. Capable of handling up to 12.5 Nm of torque in a compact 30mm diameter, it provides the stiffness required for accurate positioning while protecting components from vibration. Its maintenance-free, electrically isolating design makes it an industry standard for servo-driven machinery.