Monorail guidance systems 4.0: RUE-E series from Schaeffler

Schaeffler is introducing its fifth generation of linear recirculating roller bearing and guideway assemblies. The RUE-E series now includes sensor units that provide both automatic relubrication and bearing condition monitoring.

Where necessary, the sensors monitoring the condition of the lubricant send a message to the machine control system, initiating automatic relubrication via, for example, Schaeffler's innovative FAG CONCEPT8 multi-point lubrication system. In order to monitor the condition of the bearing, a piezoelectric accelerometer is mounted to the steel saddle plate on the carriage. This provides the vibration velocity, vibration acceleration and rolling bearing parameters to the attached signal converter, as well as monitoring the pre-set limit values.

With this new concept for the RUE-E, Schaeffler has developed a system that provides users with direct feedback and communication with the unit's control system, automated lubrication where necessary and automated maintenance. Manual lubrication is no longer necessary and lubricant usage can be reduced by up to 30 per cent. Automated condition monitoring provides predictive maintenance which, in turn, increases availability and quality, as well as reducing total cost of ownership.

In its as-delivered condition or when a linear roller bearing and guideway assembly is used in a feed spindle, the guideways are generally in optimum condition with regards to their running characteristics and lubricant condition. This can be seen through the vibration behaviour of the saddle plate when the system is in motion. In order to establish variations and deviations from this ideal nominal value, piezoelectric accelerometers are mounted to the steel saddle plate on the guideway carriage. The accelerometers are suitable for use with coolants and in harsh, contaminated environments. The permanently connected, two-wire, separately shielded cable is completely encased in polyurethane. The sensor has a sensitivity of 100mV/g, a resolution of 0.001g and a frequency range of 5000 to 50,000Hz for measuring energy spikes.

The accelerometer measures vibration velocity, vibration acceleration and provides rolling bearing parameters to the attached signal converter via the cable, as well as monitoring the pre-set limit values. The signals are then separated into different frequency ranges or an energy evaluation of the impulse peaks is carried out using spike energy (gSE). 4-20mA and 0-10V signals are passed to the PLC, the Schaeffler Box (controller) and the lubrication unit via analogue outputs. This closes the loop between the monitoring and automated lubrication.

The FAG CONCEPT8 multi-point lubricator is an integral part of the lubrication control loop. This lubrication system for rolling bearings ensures that optimum lubricant is fed to the bearings without the need for any manual intervention. If the actual evaluated signal values sent by the signal converter deviate from the nominal (pre-set) values, FAG CONCEPT8 automatically ensures appropriate maintenance measures or relubrication are initiated.

Increased life and productivity through higher limiting speeds

In order to optimise the performance of screw drives in feed spindles, it is vital they are supported by bearings with the appropriate performance, load-carrying capacity and dynamics. This is where the benefits of the ZKLN and ZKLF series of double row, preloaded angular contact ball bearings from Schaeffler come into their own. These bearings, which have been used successfully over many years, are now available in premium X-life quality.

As part of the modified X-life manufacturing process, it was possible to increase the basic dynamic load rating by a further 10 per cent, which corresponds to a 30 per cent increase in the nominal operating life. Tests have also shown that limiting speeds can also be increased by up to 60 per cent. The user benefits from reduced friction and the subsequent reduction in heat generated in the bearing. This leads to improved accuracy, increased dynamics and improved machining results. At the same time, higher speeds can be achieved during rapid traverse, which leads to increased machine efficiencies. Behaviour during changes in the direction of rotation, which often occurs in machine tools during precise positioning, also improves. Uniform frictional torque during the whole positioning process is critical here. Benchmark tests have shown that the new ZKLN and ZKLF bearings have a constant frictional torque during slow changes in the direction of rotation, resulting in very accurate positioning.

For more information about the RUE-E series of linear recirculating roller bearing and guideway assemblies please visit

Schaeffler (UK) Ltd

Unit 308, Fort Dunlop
Fort Parkway
B24 9FD

+44 (0)121 313 5830

More products
2 days ago
Compair highlights the importance of compressor energy efficiency
With the global rise in electricity prices, the energy costs of compressed air have increased to as much as 91% of the total cost of ownership, and operators need to urgently review the efficiency of their system says Graham Read, product manager for industrial compressors at Compair.
2 days ago
RS awarded platinum-level sustainability rating by Ecovadis
RS Group has been awarded a platinum medal by Ecovadis, the independent provider of global sustainability ratings used by many large organisations to help support sustainable purchasing decisions.
3 days ago
Sensor software up for industry 4.0 innovation award
The success of Baumer’s BSS sensor software has been acknowledged with it reaching the final round of the prestigious Industrie 4.0 Innovation Awards 2022. An independent jury nominated the software as contributing significantly to smart manufacturing.
3 days ago
Emka collaborates with enclosure OEM on new handle
Emka has worked with Italian control cabinet manufacturer MP Gamma to develop a newly designed handle with changeable lock inserts, with the enclosure company looking to modernise the design of its portfolio.
4 days ago
Webinar explores creating OEM-standard bodywork seams
The latest innovations in sealing technology make it possible for any body shop to replicate seams that are as good as new. In a webinar on the subject on 10 November 2022, Henkel will give delegates the benefits of its wide expertise.
4 days ago
European Springs invests in prototyping proficiency
Ensuring it maintains its position at the forefront of prototyping in the industry and is able to deliver industry leading laser-cutting speeds, European Springs and Pressings has purchased a Bodor i5 2KW fibre laser-cutting machine.
5 days ago
Omron launches cobot and AMR ROI calculator
A new ROI calculator from Omron has been launched to support the process of evaluating an investment in collaborative and mobile robots, including easy and affordable leasing opportunities that are ideal for small and medium enterprises (SMEs).
5 days ago
Mitsubishi Electric exhibits at the North East Automotive Expo
Mitsubishi Electric is showcasing how its automation technologies can drive the entire electric vehicle value chain forward at the North East Automotive Expo 2022, taking place on 29th September 2022.
6 days ago
Farnell increases investment in Traco Power portfolio
Farnell has increased its investment in Traco Power to ensure product availability and overcome supply chain challenges. Farnell now stocks Traco Power’s most popular ranges including high-performance DC/DC converters, AC/DC power supplies and DIN rail products.
6 days ago
Visitors to see the benefits automation offers at PPMA 2022
CKF Systems is delighted to be exhibiting at PPMA 2022 where it will be sharing with visitors the benefits of robotics and automation through live demos and video footage of real-world systems in action.

Login / Sign up