How are multiple screw jacks mechanically synchronised?

A robust and reliable principle that ensures absolute uniformity without complex electronics.

Mechanical synchronisation is one of the core strengths of screw jack systems in the ZIMM modular system. It makes it possible to move large, spatially distributed loads at several points simultaneously and with identical stroke. This is achieved by rigidly coupling all individual screw jacks mechanically to a single central drive motor. As long as the shafts are turning, all gearboxes are forced to move in exact synchronism. The reliability of such a system depends largely on careful design and precise assembly of the connecting elements.

The components for mechanical synchronisation

A typical mechanically synchronised system consists of the following key components:

Principles of system design

For robust and long-lasting synchronisation, the following principles should be observed in the design:

• Symmetrical load distribution: The motor should ideally be positioned so that torques and loads on the connecting elements are distributed as evenly as possible. A central power input in the middle of a long shaft line is often more favourable than feeding in from just one end.
• Minimum number of components: Every additional component (gearbox, shaft, bearing) introduces small efficiency losses and additional backlash. A layout that is as direct and simple as possible with short load paths increases efficiency, stiffness and service life of the system.
• Precise alignment: This is one of the most critical points. All screw jacks, bevel gearboxes, connecting shafts and pedestal bearings must be mounted exactly at the same height and in precise alignment. Even small misalignments lead to stresses in the system, generate radial forces on shafts and bearings and cause increased wear up to premature failure.

By consistently adhering to these principles, a mechanically synchronised lifting system is created that offers high precision, robustness and reliability – and all this without complex electronics, based solely on the mechanical ZIMM modular system.