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Ewellix
Roller screws catalogue

Roller screws catalogue

Product catalog summary

Introduction
Ewellix roller screws are advanced electro-mechanical actuation solutions used in various industries. They offer high performance and energy efficiency, with three main variants: SR, HR Ultra Power, and ISR inverted roller screws, along with special variants like SRR rotating nut roller screws.

Product Overview
The catalogue details different roller screw types designed for high load capacity and precision, offering up to 70% energy savings compared to traditional technologies.

Selection Guide
Technical concepts such as dynamic load capacity, service life, and torque requirements are covered. Material considerations, heat treatment, and operating temperature are also discussed.

Product Range
Includes planetary roller screws (SR), ultra power roller screws (HR), inverted roller screws (ISR), and recirculating roller screws (SV), each designed for specific applications.

Mounting Instructions
Recommendations for assembly, handling, storage, lubrication, and startup are provided, including support bearings assembly and lubrication methods.

Technical Request Form and Symbols
A technical request form and a section on symbols used throughout the document are included.

Company Background
Ewellix, formerly part of the SKF Group, is now owned by the Schaeffler Group, specializing in linear motion and actuation solutions.

Specifications and Product Range
Specifications for planetary and recirculating roller screws are outlined, including nut types and load ratings. Export considerations for certain applications are mentioned.

Technical Advantages
Planetary roller screws offer higher load capacities and longer service life compared to ball screws, suitable for high-performance applications.

Application Examples
Used in industries like plastic molding, automotive, and aerospace, roller screws improve productivity and energy savings.

Specifications and Technical Concepts
Focus on dynamic and static load capacities, nominal fatigue life, and service life. Load calculations and safety factors are emphasized.

Specifications and Materials
Standard screw shafts are made from pre-treated steel, with options for stainless steel. Surface coatings enhance corrosion resistance.

Operating Conditions
High temperatures can affect steel hardness, while low temperatures increase brittleness. Cooling mechanisms are offered for high cycling rates.

Preload and Stiffness
Roller screws can be preloaded for higher stiffness and reduced backlash, improving positioning accuracy.

Inspection and Certification
Inspection reports and certifications are available, including conformity with specifications and material analysis.

Concept Overview
Inverted planetary roller screws are ideal for compact applications requiring low torque and high load capabilities.

Applications
Used in industries like factory automation and aerospace, offering long service life and high load capacity.

Design Features and Benefits
Planetary roller screw design offers design flexibility and reduced motor torque requirements.

Rotating Nut Assemblies
Suitable for space-limited applications, designed for easy integration and maintenance.

Recirculating Roller Screws
Used in precision applications, offering high load capacity and positioning accuracy.

Specifications and Procedures
Emphasizes proper lubrication, alignment, and monitoring for optimal performance and longevity.

Lubrication Recommendations
Frequent small amounts of grease are advised, with specific guidelines for oil lubrication and wipers.

Environmental Constraints
Outlines operating conditions, including corrosive and vacuum environments.

Symbols and Definitions
Includes a comprehensive list of symbols and definitions related to mechanical properties.

Disclaimer
Notes that Ewellix does not take responsibility for damages from omissions or errors, and specifications are subject to change.

Catalog excerpts

Roller screws catalogue

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The heritage of innovation Ewellix is a global innovator and manuacturer of linear motion and actuation solutions. f Our state-of-the-art linear solutions are designed to increase machine performance, maximise uptime, reduce maintenance, improve safety and save energy. We engineer solutions for assembly automation, medical equipment, mobile machinery, distribution and a wide range of other industrial applications. Technology leadership We earned our reputation through decades of engineering excellence. Our journey began over 50 years ago as part of the SKF Group, a leading global technology provider....

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Trusted engineering expertise Our industry is in motion; pushing towards solutions that reduce environmental impact and leverage new technology. We provide technical and manufacturing expertise to overcome our customers’ challenges. We work in a wide range of industries, where our solutions provide key functionality for business critical applications. We have a unique understanding of linear equipment and how it’s integrated in customers’ applications to provide the best performance and machine efficiency. For the medical industry, we provide precision components for use in core medical equipment....

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Introduction to roller screws Ewellix roller screws, high performance driving solutions A wide assortment of industries rely on Ewellix roller screws for their actuation requirements. Leading the trend to move from traditional forms of linear actuation, Ewellix roller screws represent the state of the art driving force for powerful electro–mechanical actuation. Ewellix is a pioneer in the technology of roller screws and offers high quality, high performance and the widest assortment of roller screws available on the market. The Ewellix in–house highly integrated manufacturing process uses the...

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Product overview Planetary roller screws SR Ultra Power planetary roller screws HR Inverted planetary roller screws ISR • Wide assortment of diameters and leads for numerous applications • Extreme load carrying capacity • All the feaures and benefits of the planetary roller screw design • Reliable driving solution with high loads and speeds capabilities • Robustness and long service life for highly demanding applications • Plus small leads, high load carrying capacity within a compact design Rotating nut planetary roller screws SRR Zero lead roller screws Recirculating roller screws SV • Operation...

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Preferred range The Ewellix preferred range encompasses the most frequently used sizes of planetary roller screws and recirculating roller screws. Within that assortment, standard size nuts are stocked at Ewellix factories in Europe and North America for improved availability, greater value, and shorter delivery times. Shafts are manufactured according to customer requirements. Design and manufacturing operations • Standard roller screws with standard and maximum load ratings are available with axial play (SR or SV prefix), or without backlash (BR or BV prefix) • Nut dimensions are detailed hereafter...

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Planetary roller screws with standard nuts in stock • SRC cylindrical nut with axial play • BRC cylindrical nut without backlash SRC/BRC cylindrical nut with wipers SRF/BRF flanged nut with wipers • SRF flanged nut with axial play • BRF flanged nut without backlash • SRC/BRC/SRF/BRF nuts with wiper recesses as standard • Standard wipers supplied on request • Right handed thread only • Standard or maximum number of rollers available Nominal diameter Basic load rating Maximum total shaft length Ltp mm SRC/BRC SRC/BRC SRC/BRC/SRF/BRF SRC/BRC SRC/BRC/SRF/BRF SRC/BRC SRC/BRC SRC/BRC/SRF/BRF SRC/BRC/SRF/BRF...

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With planetary roller screws, the application load is transmitted from the nut to the shaft through the barrel–shaped surfaces of the rollers. The number of contacts and the total surface area of the contacts between the shaft, the rollers and the nut are substantially increased compared to the ball screw design, resulting in larger dynamic and static load carrying capacities (⮑ fig. 1). This mechanical advantage minimizes input torque and increases application resolution and performance. They can simplify a complete transmission and improve its rigidity. They are often used in applications involving...

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Selection guide Planetary roller screws SR/BR, HR: Standard and maximum dynamic load carrying capacity Ca [kN] Nominal diameter d0 mm SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR HR SR/BR SR/BR SR HR SR SR HR SR HR HR SR HR HR HR HR HR HR Standard number of rollers Maximum number of rollers, on request Preferred range

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SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR SR/BR HR SR/BR SR/BR SR HR SR SR HR SR HR HR SR HR HR HR HR HR HR SR (C, F or P): Planetary roller screw with axial play BR (C, F or P): Planetary roller screw without backlash HR (C, F or P): Ultra Power planetary roller screw C: Cylindrical nut, F: Centered flange, P: Off–centered flange

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Planetary roller screws PR, with internal preload: Standard and maximum dynamic load carrying capacity Ca [kN] Nominal diameter Standard number of rollers Maximum number of rollers, on request PR (U or K): Planetary roller screw with preloaded split nut U: Cylindrical nut, K: Centered flange

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Inverted roller screws ISR/IBR: Standard dynamic load carrying capacity Ca [kN] Nominal diameter d0 mm ISR/IBR ISR/IBR ISR/IBR ISR/IBR ISR/IBR ISR/IBR ISR: Inverted roller screw with axial play IBR: Inverted roller screw without backlash Rotating nut roller screws SRR/BRR: Standard dynamic load carrying capacity Ca [kN] Nominal diameter d0 mm SRR/BRR SRR/BRR SRR/BRR SRR/BRR SRR/BRR SRR: Rotating nut roller screw with axial play BRR: Rotating nut roller screw without backlash

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