Experience from more than 20,000 drive installations has led to the high torsional elasticity and excellent dampening capability of the SPIROFLEX shaft coupling that renders this marine coupling indispensable for propulsion systems prone to torsional vibration.

The most significant feature of the coupling is its rubber elements’ high torsional flexibility. Various rubber hardness grades effectively influence the natural frequencies arising in the respective drive system. As a result of major development efforts considerable improvements were attained in the area of attaching rubber material to steel parts.

The shaping of the vulcanization surfaces of ring elements and segments as well as the shaping of the rubber contours, which has been proven by comprehensive testing and documentation, led to an uniform, low stress/strain distribution over cross sectional area as well as to a low deformation energy density at the segmental faces. The extreme reductions of stresses in the marginal zone of rubber-to-metal bonding interfaces and a high dynamic safety are further advantages.