Hydraulic shrink discs

The shrink disc creates a backlash-free connection by pressing the hub onto the shaft. This connection is primarily used to transmit torque. In doing so, the shrink disc is solely responsible for providing the necessary forces, but does not itself transmit any forces or torques between the shaft and the hub. It therefore remains outside the force path.

The basic principle of the mechanical, three-part shrink disc has been retained in the hydraulic version. This proven design is characterised by a clear separation of the force-transmitting friction surfaces from the hydraulic system. This reliably prevents oil from contaminating the friction surfaces.

The hydraulically shrink discs in the standard SHS series offer a safe, fast and cost-effective solution for friction-fit shaft-hub connections. They are used in applications where high reliability, short assembly times and ease of use are required.

The SHS-P and SHS-PA series were developed for use in gearbox test benches, where frequent clamping and release is a fundamental requirement.

Thanks to the hydraulic clamping principle, the shaft and hub can be connected particularly quickly and reliably. Compared to conventional mechanical shrink discs, this can save up to 95% of the assembly time. This reduces downtime and significantly increases the efficiency of maintenance and assembly processes.

Installation is carried out by sliding the shrink disc onto the hollow shaft and then tightening it using the hydraulic system. The use of tapered surfaces reduces the internal diameter and builds up radial pressure. Once tightening is complete, the hydraulic shrink disc is mechanically locked in place and the hydraulic pressure is released.

Due to this simple procedure, the series is suitable for repetitive clamping operations, such as those occurring on a test bench.

To ensure proper function and to achieve a sufficiently high coefficient of friction, the contact surfaces between the shaft and hub must be free of grease, dry and clean. The functional surfaces of the shrink disc are already lubricated at the factory. The contact surfaces between the shrink disc and hub must also be lubricated prior to assembly.