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EWELLIX
Roller screws catalogue

Roller screws catalogue

Product catalog summary

Introduction to Roller Screws
Ewellix offers high-performance roller screws, emphasizing a shift from traditional linear actuation methods. Their roller screws are known for high quality and performance, with variants in stainless and high-temperature steel.

Product Overview
Ewellix provides several types of roller screws, including Planetary, Recirculating, Ultra Power, and Inverted Roller Screws, each designed for specific applications such as high load capacity, precision, and compact design.

Selection Guide
The guide covers dynamic load capacity, service life, efficiency, materials, heat treatment, operating temperature, and preload adjustments, with calculation formulas and examples for selecting the appropriate roller screw.

Product Range
Ewellix's product range includes various roller screw types with standard sizes for quick availability and custom machining options.

Mounting Instructions
Recommendations include handling, storage, lubrication, and alignment, with guidelines for starting up the screw and assembling support bearings.

Technical Request Form and Symbols
The document includes a technical request form for custom solutions and a section on symbols used throughout the catalogue.

Company Overview
Ewellix, formerly part of SKF Group, is a global leader in linear motion and actuation solutions, providing engineering expertise and integrated solutions across various industries.

Specifications
Detailed specifications for roller screws include nominal diameter, lead, basic load ratings, and maximum shaft lengths, with distinctions between nuts with axial play and those without backlash.

Advantages
Roller screws offer higher load carrying capacity, longer service life, increased speed and acceleration, and reduced noise compared to ball screws.

Applications
Used in industries like plastic molding, automotive, aerospace, and oil & gas for their efficiency, reliability, and ability to operate in harsh environments.

Specifications and Procedures
Includes nominal fatigue life, service life factors, static load carrying capacity, and recommendations for high precision applications.

Material Specifications
Discusses various steels used for roller screws, including through-hardened 100Cr6 bearing steel and stainless steel variants.

Surface Hardening and Coatings
Induction hardening enhances surface hardness, with coatings like manganese phosphate for corrosion resistance.

Operating Conditions
Highlights the impact of temperature on material properties and the importance of cooling mechanisms for high cycling rates.

Screw Shaft Design
Guidelines for calculating permissible loads using Euler formulae, considering buckling and column strength.

Preload and Stiffness
Effects of preload on load distribution and stiffness, with guidelines for preload torque tolerances.

Inspection and Certification
Inspection reports and certifications can be provided, including conformity with specifications and material analysis.

Working Environment
Roller screws are not ATEX certified, requiring compliance with European directives for explosive environments.

Specifications and Calculations
Detailed specifications and calculations for selecting and evaluating planetary roller screws, including bore diameter, braking torque, static axial stiffness, and dynamic carrying capacity.

Procedures
Procedures for selecting a planetary roller screw, including determining required linear speed and evaluating load cycles.

Norms and Recommendations
Recommendations for selecting support bearings and considering critical speed and buckling strength.

Product Range and Features
Describes the product range of planetary roller screws, highlighting features like high load carrying capacity and robustness.

Application Examples
Examples include presses for plastic injection moulding, electro-mechanical presses, and factory automation.

Tables and Diagrams
Includes tables and diagrams illustrating load cycles, screw configurations, and technical specifications.

Specifications and Procedures
Instructions on lubrication and maintenance of roller screws, emphasizing periodic lubrication and maintenance schedules.

Lubrication Recommendations
Recommendations for grease and oil lubrication, including types, schedules, and specific procedures.

Technical Request Form
Includes a form for preselection design parameters, customer and project information, and operating conditions.

Symbols
Concludes with a section on symbols used in the technical specifications.

Catalog excerpts

Roller screws catalogue

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Ewellix is a global innovator and manufacturer of linear motion and actuation solutions used in industrial automation, automotive assembly, medical applications and mobile machinery. Formerly part of SKF Group, the Ewellix Group consists of 16 sales units and eight factories. External net sales are approximately 2.3 SEK billion and we employ around 1 200 people. Ewellix is headquartered in Gothenburg, Sweden and is owned by Triton. Technology leadership Global presence and local support Our journey began over 50 years ago as part of the SKF Group, a leading global technology provider, with the...

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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....

Open the catalog to page 5

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...

Open the catalog to page 7

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...

Open the catalog to page 8

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...

Open the catalog to page 9

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...

Open the catalog to page 10

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...

Open the catalog to page 11

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

Open the catalog to page 13

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

Open the catalog to page 14

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

Open the catalog to page 16

All EWELLIX catalogs and technical brochures

*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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