Profile rail guides - LLT catalogue

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....

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....

The productivity and economic success of a given application depends, to a large extent, on the quality of the selected linear components. Often these components determine market acceptance and thus help to obtain a competitive edge for the manufacturer. To do this, the linear components have to be as adaptable as possible to precisely meet the application’s requirements, ideally with standard components. The Ewellix profile rail guide series LLT satisfies these market demands: available in a wide range of sizes, carriages and accessories as well as in various preload and precision classes, LLT...

Due to the design-related smaller lever arm, the X-arrangement provides better self-aligning capability. Just as with rotary bearings, the raceways of profile rail guides can be arranged in an X- or O-configuration. The technical characteristics of these two arrangements are e ssentially the same. Therefore, there are no basic differences in behaviour in the vast majority of load situations, except when they are subjected to moment loads around the x-axis. In combination with a two-point contact of the rolling elements, running friction is kept to a minimum. This results in a smooth and stick-slip-free...

1.2.1 Components and material specifications 1 Steel balls 3 Square nut 4 End plate 5 Lubricant reservoir 6 Front seal Screw 8 Grease nipple 9 Material specifications 1. Steel, inductive hardened 2. Steel, case hardened 3. Bearing steel 4. Steel, zinc coated 5. POM, reinforced 6. EPU foam 7. PA 6.6 and Elastomer; alternative low friction S0 shield made from PA 6.6 8. Steel 9. Steel, nickel coated

1.2.2 Standard carriage components Grease nipple Seals The ingress of dirt, swarf and liquids, as well as lubricant leakage can significantly reduce the service life of a profile rail guide system. Ewellix LLT profile rail guide carriages are therefore supplied with front, side and inner seals as standard, which can significantly extend service life. Front seal Two lube ports with metal thread are located on both front sides of each carriage. As standard, one grease nipple for manual relubrication is supplied along with the carriage, while the opposite side is secured by a set screw. The metal...

Improved running performance The LLT profile rail guide has four rows of balls with a 45° contact angle between the rolling elements and raceways. This X-arrangement improves the system’s self-aligning capability. Mounting deviations can be accommodated even under preload, resulting in smooth running performance. Friction is kept to a minimum due to two-point ball contact. This enables reliable, stick-slip-free operation for the life of the rail guide. Modular concept for customized solutions Applications have different speed, precision and environmental requirements. As a result, Ewellix LLT...

1.4 Product range 1.4.1. Product overview LLTHC ... SA Flanged carriage, short length, standard height Further information on page 38 Flanged carriage, standard length, standard height. Further information on page 40 Flanged carriage, extended length, standard height Further information on page 42 LLTHR profile rail with blind holes Additional information on page 58 LLTHC … R Slim-line carriage, standard length, extended height Further information on page 50 LLTHR profile rail with standard holes Additional information on page 56 LLTHR profile rail with protective metal plugs Additional information...

Carriages Table 1 Size Precision class Designation Preload class T0

Precision class Designation Preload class T0

Rails Table 2 Size Precision class Designation One-piece-rail LLTHR 25-…P5 A LLTHR 25-…P5 A D4 LLTHR 25-…P5 A D6 LLTHR 25-…P3 A LLTHR 25-…P3 A D4 LLTHR 25-…P3 A D6 LLTHR 20-…P5 A LLTHR 20-…P5 A D4 LLTHR 20-…P3 A LLTHR 15-…P5 A LLTHR 15-…P5 A D4 LLTHR 15-…P3 A LLTHR 15-…P3 A D4

2.1.1 Load rating Definition of the basic dynamic load rating C The basic dynamic load rating C is the radial load, constant in magnitude and direction, which a linear rolling bearing can theoretically accommodate for a basic rating life represented by a travelled distance of 100 km (according to ISO 14728 Part 1). NOTE: As per ISO 14728 Part 1, it is also permissible to state a reference distance of 50 km travelled. In this case, a conversion factor of 1,26 should be applied in order to enable proper comparison of the two load rating values (⮑ formula 1). (1) Definition of the basic static load...

2.1.2 Preload classes To adjust a profile rail guide to the specific requirements of a given application, it is advisable to choose an appropriate preload. Preload can enhance the performance of an entire linear guidance system and increase the rigidity of the carriage under load . Preload is determined by oversizing between steel balls and raceways on carriage and rail track. This is ensured by state-of-the-art, high-precision grinding processes carefully matched with rolling elements. LLT ball profile rail guides are available in three different preload classes, as shown in table 1. NOTE: The...