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EWELLIX
Roller screw catalogue

Roller screw catalogue

Product catalog summary

Introduction
Ewellix roller screws are high-performance solutions for actuation needs across various industries, known for their reliability, precision, and efficiency. The manufacturing process involves advanced machining and testing to ensure quality.

Product Overview
The catalogue details various roller screws:

Planetary Roller Screws (SR, HR, ISR): High load capacity and precision for demanding applications.
Recirculating Roller Screws (SV): Fine resolution and stiffness for ultra-precision applications.
Rotating Nut Roller Screws (SRR): Compact design with integrated support bearing.
Zero Lead Roller Screws: High thrust capacity in a compact form.

Selection Guide
Discusses load capacities, service life, speed limits, efficiency, and torque requirements. Key parameters include Dynamic Load Capacity (Ca), Static Load Capacity (C0a), Critical Rotating Speed (ncr), and Efficiency (η).

Product Range
Ewellix offers a range of roller screws with standard sizes and nuts available for quick delivery, with custom machining and special treatments available upon request.

Mounting Instructions
Recommendations for assembly, handling, storage, lubrication, and alignment to ensure optimal performance and longevity.

Technical Request Form and Symbols
Includes a form for custom solutions and explanations of symbols used throughout the document.

Company Overview
Ewellix, formerly part of SKF Group, is a global leader in linear motion and actuation solutions, focusing on innovation and customer support.

Specifications
Details specifications for roller screws, including nominal diameter, lead, basic load rating, and maximum shaft length. Distinguishes between nuts with axial play and those without backlash.

Advantages
Roller screws offer higher load carrying capacity, longer service life, and increased operational speeds compared to ball screws.

Applications
Used in industries like aerospace, automotive, and manufacturing, ideal for applications such as plastic moulding and factory automation.

Procedures
Service life affected by lubrication, wear, and contamination. Maximum cycle operating load should not exceed 80% of Ca.

Technical Concepts
Discusses equivalent dynamic load, basic static load carrying capacity, permissible speed limit, and critical rotating speed.

Recommendations
For high precision applications, operate below static load carrying capacity. Proper lubrication is crucial for heavily loaded applications.

Efficiency
Depends on contact surface geometry and working conditions, with practical efficiencies calculated using a practical coefficient of friction.

Back-driving and Braking Torque
Most roller screws are reversible; a braking mechanism is recommended to avoid back-driving.

Torque and Stiffness
Explains breakaway torque, driving torque, static axial stiffness, nut stiffness, and shaft stiffness.

Materials and Treatment
Standard screw shafts made from pre-treated steel, with specific materials and treatments for optimal performance.

Material Specifications
Through hardened 100Cr6 bearing steel used for nuts and rollers, with stainless steel options available.

Surface Hardness and Load Ratings
Surface hardness affects load ratings, with corrections for hardness below 654 HV (58 HRC).

Operating Temperature Considerations
High temperatures reduce steel hardness; low temperatures increase brittleness.

Screw Shaft Design and Strength
Design must consider dynamic and static compression loading.

Product Inspection and Certification
Inspection reports and certificates available, including conformity with specifications.

Axial Play and Preload
Standard roller screws have axial play; can be manufactured without backlash or with preload.

Preload Torque and Adjustment
Preload torque calculated for optimum stiffness, with tolerances based on screw thread helix angle.

Specifications and Calculations
Provides detailed specifications and calculations for selecting and evaluating planetary roller screws.

Procedures
Outlines procedures for calculating equivalent mean load, required dynamic carrying capacity, and critical speed.

Norms and Recommendations
Recommendations for selecting roller screws based on application requirements.

Key Data and Figures
Figures and diagrams illustrate configurations for stiffness calculation and critical speed evaluation.

Application Examples
Lists potential applications for planetary roller screws, such as presses and machine tools.

Overview
Provides a detailed technical description of inverted roller screws and their applications.

Specifications and Design Features
Inverted roller screws designed to replace hydraulic or pneumatic systems.

Product Range and Technical Characteristics
Lists various models of roller screws with technical characteristics.

Applications and Benefits
Used in diverse applications, offering high load carrying capacity and precise positioning accuracy.

Running-in Period
Non-preloaded roller screws require a running-in process during initial operation.

Monitoring Screw Life
Key indicators of screw wear include fatigue flaking and increased axial play.

Traceability
Each roller screw is engraved with a unique serial number.

Support Bearing Assembly
Includes checking the fitting direction and ensuring proper torque application.

Recommendations for Bolts
Use bolts complying with ISO class 12.9 for flanged nuts.

Alignment
Proper alignment of linear guidance systems is crucial to avoid non-axial loading.

Lubrication
Lubrication prevents metal contact, corrosion, and wear, maximizing service life.

Types of Lubricants
Grease is the most common, with synthetic base oils preferred for stability.

Lubrication Schedule
Initial lubrication involves applying grease to the shaft and nut.

Specifications and Procedures
Provides detailed instructions on the lubrication and maintenance of roller screws.

Lubrication Recommendations
For grease lubrication, a metallic complex soap or barium-based grease is recommended.

Wipers and Dry Lubricants
Wipers are crucial for preventing contamination and maintaining lubrication.

Technical Request Form
Includes a form for preselection design parameters and operating conditions.

Technical Document Summary
Provides specifications, procedures, and calculations for roller screws.

Catalog excerpts

Roller screws catalogue

Open the catalog to page 1

Ewellix is a global innovator and manufacturer of linear motion and actuation solutions used in assembly automation, 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 1200 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 world’s first precision...

Open the catalog to page 4

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...

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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...

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...

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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...

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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