Posted to News on 17th Jul 2026, 13:00
Simple-Flex spacer coupling with flexible composite tube
The "Simple-Flex" series from JAKOB Antriebstechnik is a spacer coupling that can be manufactured in lengths ranging from 0.5 m to 6 m and operates without the need for additional intermediate bearings, even over large shaft spans.
Thanks to a sophisticated composite tube featuring a multi-layer, angle-specific fibre configuration, the design is remarkably simple; it accommodates axial, radial, and angular misalignments without requiring the compensating elements typically found in such couplings.
Extensive simulation calculations and testing led to the development of a composite tube that combines bending flexibility with high torsional stiffness. Its very low weight - resulting in low moments of inertia - and optimal balance quality ensure peak operating speeds and torque levels with exceptionally smooth running, all while effectively compensating for shaft misalignment.
At the same time, the composite tube provides good damping characteristics, helping to reduce vibrations within the drive system. Typical applications include positioning tasks in gantry systems, fan drive units, indirect drives, spindles, and test stand setups.
Two hub types to choose from
The "Simple-Flex" spacer coupling is available with either a rotationally symmetrical conical clamping ring or an easy-to-install split-hub design. The split hub features two radial clamping screws and offers minimal mass and moment of inertia, making it the more cost-effective option; meanwhile, the conical hub - with its high clamping forces - is particularly well-suited for high rotational speeds.
Other hub designs and tube diameters are available upon request. Custom configurations are also possible, including flange hubs for flexible assembly, expanding conical hubs for integrated mounting, and positive-locking hub designs featuring keyways (tolerances P9 and JS9) or internal splines (e.g., DIN 5480).
The three available composite tube sizes are suitable for torques up to 2,900 Nm. These spacer couplings are backlash-free, maintenance-free, and corrosion-resistant, and they are designed for operating temperatures ranging from -10degC to 60degC.
Compared to conventional spacer couplings, the Simple-Flex covers a wider range of applications.
