Already more than 30 years ago Röhrs developed a new spring assembly consisting of helical springs made of flat wire and screwed into each other. For this spring assembly the brand names “SCHRAUBENTELLERFEDER®” and "HELICODISC®" have been created and protected.
Since the 1980s Röhrs has been successfully selling spring assemblies of this brand on the market. Thus they are proven and tested machine components which in many cases replace the common multi-layer disc spring assembly. The uninterrupted gain structure of the raw material leads to an increased durability and reduces the risk of breakage of the HELICODISC® helical disc springs. In principle, the characteristics of any inversely layered disc spring assembly can be realized with a helical disc spring. The load increase is proportional to the deflection since there appears only bending stress in the spring steel.
The essential advantages:
•Single component design, no breakup into individual parts
•Simple, cost-saving assembly and maintenance
•Extremely high spring load at a minimum outer diameter and a low hysteresis
•No erroneous diagram results caused by incorrect layering or grease influence
•High durability due to the use of strip steel with uninterrupted grain structure
•High operational safety due to stable spring loads even in case of breakage (no loss of deflection)
•Spring characteristics can be designed according to customers' requirements
•No friction at mandrel or sleeve due to the fact that the stiffness of the spring allows to dispense with any guidance
•High resistance to negative environmental conditions and extreme temperature variations
•Economical producibility for all applications, also in small quantities
This power pack is composed of a quadruplicated screwed together HELICODISC® helical disc spring.
It is applied in hydrogen fuel cells featuring a high energy density for instance (e.g. submarines and satellites)
The benefits include:
•Extreme high spring force by minimal outer diameter
Example: With an outer diameter of 18 mm a spring force of 10 kN is achieved. With an outer diameter of 23 mm a spring force of 25 kN is achieved.
•Designs to meet customer requirements
•High lifetime and operational safety
•Easy and low-cost assembly and maintenance due to single component design
•Little hysteresis, minimal wear