PRODUCTS BEARINGS, SEALS & LINEAR MOTION NEW BEARING SEALING CONCEPTS
Two new sealing concepts for its Generation C bearings have been developed by Schaeffler. The new Z-type dust shield with its labyrinth seal helps to reduce grease loss by 20%, and reduces contamination by 30% compared to the previous design. The patented ELS lip seal (optional) provides maximum sealing at low friction and is particularly suitable for alternating axial loads, such as those found in the wheel bearings of motorcycles. In addition, non-contact BRS lip seals and HRS lip seals, which start at the inner ring, are available with increased sealing performance in the standard range. The high quality of the balls and a noise-
optimised cage enable Generation C bearings to run at significantly reduced noise levels and with lower friction, the company explains. Their benefits mean Generation C bearings
are ideal for use in electric motors. The efficiency of small electric motors with low capacity – the type often found in electrical consumer goods such as washing machines,
dishwashers, fans and power tools – is mostly determined by the power loss of the internal bearings. Generation C bearings not only offer 35% less friction than their predecessor, but also cut noise levels by 50%. This means a more efficient motor, resulting in reduced energy consumption. Motorcycle manufacturers are also
benefitting from Generation C bearings, including in emerging markets such as South East Asia and India, where road conditions and the environment are challenging and the bearings are often exposed to severe contamination and ingress of water.
Schaeffler UK
www.schaeffler.co.uk
to medical data such as blood pressure. The mother’s breathing sounds and
expressions of pain, as well as the child’s heart rate, are audible; and the effects of medications are simulated. The position of the child in the pelvis is displayed in 3D on the screen. It is possible for the physician to call up 14 birth scenarios on the touchscreen, but there is also a ‘random programme’ with undefined parameters. Mechanical optimisation work was required
LINEAR SYSTEM HELPS TO DELIVER A MAINTENANCE- FREE BIRTH SIMULATOR
With 3B Scientific’s SIMone birth simulator, gynaecologists and midwives in training help a plastic foetus to be delivered in different scenarios, each requiring specific procedures. The actual birth process is both recorded and predefined with the aid of a force feedback system so the foetus moves through the birth canal. The integrated force-moment sensor measures the forces and the directions with which the obstetrician brings the baby into the world, and displays on the screen, in real time, these actual values in comparison with the set points regarded as optimal, in addition
for this - especially on the linear axis, which provides the path through the birth canal. In one of the original designs a recirculating ball bearing guide was used but it had to be cleaned regularly because the lubricant needed to simulate the birth process dripped into the unit. So, the drylin system from igus was selected
as an alternative. These linear axes use a sliding pair of hard-anodised slide rails and liners made of plastic iglidur with incorporated lubricant. For the positioning of the foetus, a drive rod
consisting of an igus lead screw and an anti backlash lead screw nut is used. The worm wheel on the force feedback sensor, which causes the rotation of the foetus and was originally made of brass, was also replaced.
igus
www.igus.co.uk/drylin AN INFORMATIVE GUIDE TO CERAMIC BEARINGS
The ‘Ceramic bearings: Your essential guide to ceramic bearings’ guidebook from SMB Bearings has been created for engineers working on design projects in which non-conductive or corrosion resistant bearings are required. This can be downloaded for free from the website. This distinguishes between common ceramic materials and their properties. Each ceramic
material, including zirconia (CCZR), is accompanied with a list of material properties and applications. The guide also identifies the difference between full ceramic and hybrid bearings. Chris Johnson, managing director of SMB Bearings, said: “The team is committed to
helping engineers select the specific bearing material, size and lubrication to ensure the application operates as effectively as possible... This free downloadable guide to ceramic bearings should further inform perspective buyers, including those who are unfamiliar with the different ceramic material types.”
SMB Bearings 20 SEPTEMBER 2019 | DESIGN SOLUTIONS
www.smbbearings.com
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