Euro-Bearings Ltd’s Combined Roller Bearing range offers one of the most versatile linear motion systems.
The combined roller bearing is a unit consisting of two roller bearings assembled on a weldable hub and it is designed to carry both axial and radial loads. The bearings are used in conjunction with special steel profiles (C or I) to form a heavy duty linear sliding system.
The bearings and rails can be used both horizontally and vertically, and can also be arranged telescopically to allow for full extension. The simplest system consists of just four bearings and two rails. Some application examples are shown below.
With the standard range of bearings offering diameters from 52.5mm to 149mm, and the Jumbo range offering sizes up to 390mm, the system is suitable for a wide variety of applications.
The bearings can be supplied pre-welded to a mounting plate which can then simply be bolted on, or they can be welded directly to the structure for a more compact configuration.
Our knowledgeable technical sales team can offer advice on applications, design, corrosion resistance and sizing. Please call or email to discuss your requirements.
Application Examples for Combined Roller Bearings and Profiled Rails:
There are now 3D STEP files available for all the carriages and rails of our Aluminium Motion Guidance range. The files can be downloaded from our website. Please see our webpage here: https://www.euro-bearings.com/mgsalu.htm
Please email us if you need a different file type.
In some applications, it is necessary to specify corrosion resistant products (e.g. food, drink & pharmaceuticals) while in other applications it may be desirable but not essential (e.g. offshore, external use). While a few linear motion products are available in stainless steel, there are often high prices, long lead times & lower load capacities associated with specifying stainless steel.
For heavy duty applications there is little choice but some products can be made corrosion resistant by the use of coatings. The most effective coating for linear motion systems is Thin Dense Chromium (TDC). TDC coating provides a hard finish which is able to withstand the high contact load between the bearing and its corresponding track.
Which Products are available?
Euro-Bearings Ltd can offer Combined Roller Bearings with TDC coating to provide a heavy duty corrosion resistant linear motion system. The bearings retain their load capacities (unlike stainless steel alternatives) and maintenance and downtime can be reduced. The TDC coating can also be applied to the rails (channel) and flanged clamps if desired. The combined roller bearings offer a versatile linear motion system which can be used in horizontal, vertical or cantilevered applications.
Another linear motion system to benefit from TDC coating is Vee bearings. While the Vee bearings themselves can be supplied in stainless steel, the T rail to suit the bearings is not so readily available due to the high costs associated with stainless steel. The rails can be TDC coated after any necessary fabrication work and the lead time can be as little as two weeks.
What should I choose?
Every linear motion application should be assessed individually. Use our flow chart to help select which product might be suitable, or ask our technical sales team for advice.
If corrosion resistance is required then consider the following products:
Traditionally, corrosion resistance of linear motion products has been provided in the form of stainless steel. However, today, coatings such as Thin Dense Chromium can provide corrosion resistance to bearings without compromising on load capacities and incurring long lead times.
Are you looking for a quiet linear motion system? Then look no further. Our new Vulkollan coated bearings are designed to run in our steel C channels to make a sliding system that is both smooth and quiet.
Choose from V.053P (52.5mm ø) or V.054P (62.5mm ø). V.054P is also available in stainless steel.
The Oilamid rubbing block can be adjusted – by simply turning a screw – to provide axial guidance and support which helps the system to run true.
Combined Roller Bearings & Mating Steel Profiles are one of the most versatile linear motion systems. Originally used on forklift trucks, the bearings are designed to carry both the axial and radial loads in one unit. The bearings and rails can be used horizontally and vertically, and can also be arranged telescopically to allow for full extension.
The main
advantage of Combined
Roller Bearings over other track rolling systems is that the smaller
axial rollers contact the web of the profiled rails. This helps to
keep the system running parallel and consequently prevents it from jamming.
The
bearings can be supplied pre-welded to a mounting plate and then
simply bolted onto the carriage or they can be welded directly to the structure
for a more compact configuration.
With good resistance to dirt and heat, Combined Roller Bearings can be used in many industrial applications: from packaging machines to furnace loaders, brick makers to offshore pipe and cable laying devices, to name just a few.
If you have a heavy duty linear motion application, please contact our technical sales team for help and advice.
There is a vast range of linear motion products on the market and it can be difficult to know which product to select. This article discusses the various types of products available according to their rolling element and explores their advantages, disadvantages and limitations. Finally a selection chart clearly lists each product’s characteristics to help with specifying the best linear motion product.
Some of our linear motion products are shown in the table below:
The primary purpose of linear motion products is to move something from one place to another in one direction along a straight line. Usually this is achieved using a bearing with a rolling element. Traditionally this rolling element would be a ball or roller, but these days some linear motion bearings do not incorporate a rolling element and consequently are known as ‘plain’ bearings. These plain bearings are simply plastic or ceramic bushes and are sometimes lined with PTFE or oil impregnated plastic to help reduce the sliding friction. Continue reading →
Our Euro-Vee Bearings are available in 4 sizes which can take radial loads from 100kg up to 800kg. A cost effective linear sliding system can be built using our corresponding T Rail and Euro-Vee Bushings for applications requiring either vertical or horizontal movement.
The bearings are sealed and lubricated for life and so will tolerate being used in dirty environments. The Vee Bushings are used to mount these bearings. We have both concentric and eccentric bushings on stock, in both imperial and metric sizes.
A typical system would use a pair of rails with a minimum of four bearings acting as wheels for a carriage. Half the number of bearings would be mounted on the concentric bushings and the other half mounted on the eccentric type. All the bearings are held in position on their bushings by a bolt fixed through the centre of the bushing. By rotating the eccentric bushings it is possible to tighten the bearings onto (or off) the track. The eccentric bushings have a hex head so that they can be rotated with a spanner before their fixing bolts are tightened back up. The system should be designed so that the main loads are taken by the bearings on the concentric bushings.
The T Rail can either be drilled and bolted down (to a square edge) or it can be welded into position. The body of the rail is soft so it can be easily drilled. The top edge of the rail (where the bearing runs) is induction hardened and polished.
It is also worthing knowing that our Euro-Vee Bearings can be run on round (hardened and ground) linear shaft.
Example applications include:
packaging machinery
laboratory automation
woodworking machinery
vending machines
sliding doors (eg machine tool doors)
Our Euro-Vee Bearings are also available in stainless steel.
This blog is being developed to provide you with more information about our product range. Each blog will focus on a product range. The aim is to highlight the advantages it offers and give you an overview of typical applications.