FEATURE BEARINGS, SEALS & GASKETS PROTECTION
AGAINST CURRENT Schaeffler has
against the risk of current passage.
introduced a new series of bearings featuring a coating that offers improved
protection against the risk of current passage
T
he use of electric motors or generators with frequency converters is increasingly becoming the norm – whether in traction
motors for rail transport, wind energy systems or drive technology. This trend, however, also introduces the risk of electrical voltage developing between the inner and outer rings of rolling bearings, which can damage lubricants, rolling elements and raceways, and result in premature bearing failure. Implementing measures to prevent such damage and failures is therefore advisable at the early planning stage. To help, the new J20G series bearings
from Schaeffler have an optimised Insutect A coating, offering even greater protection
RELIABLE PROTECTION The outer surfaces of the outer and inner rings are coated with Insutect A, an insulating aluminium oxide coating applied using plasma spraying. The aluminium oxide coating is extremely hard, resistant to wear, and a good conductor of heat. Schaeffler has refined the bearing coating
process for enhanced reliable protection against current passage to provide a more efficient insulation protection, even under challenging operating conditions such as high humidity. The result is reduced maintenance costs, increased machine availability and operational safety, and an extended grease service life. The bearings can withstand direct voltages
of at least 3,000 volts and exhibit a higher impedance and an ohmic resistance of at least 250 megaohms. The bearings, the company explains, are available as standard in the J20GA, J20GB, and J20GI variants to meet diverse requirements. The J20GB coating thickness provides enhanced protection for higher electrical currents, such as those encountered in the rail sector. The highest level of protection is achieved with bearings that feature a coated inner ring (J20GI). Other
variants are available upon request.
MEETING REQUIREMENTS The external dimensions of the bearings conform to the dimensions specified in DIN 616 standards, which means they have the same dimensions and tolerances as standard bearings and offer seamless interchangeability. Deep groove ball bearings and cylindrical
roller bearings are most commonly used with aluminium oxide coatings, although other bearing designs are also available with the coating by agreement. Insutect A-coated bearings from Schaeffler meet all requirements relating to service life, maintenance intervals, operational safety and cost-efficiency. In addition to bearings with coated rings, the
company offers hybrid bearings with ceramic rolling elements, which offer the highest resistance to current passage. For applications with elevated requirements or outside diameters measuring less than 120mm, Schaeffler experts recommend the use of hybrid bearings.
Schaeffler (UK)
www.schaeffler.co.uk/en/
SLIP RING BEARINGS: THE BENEFITS
systems requiring freedom of movement. Invaluable across
industries including marine, aerospace, and defence, supporting applications like mechanical winches, wind turbines, and fibre benoptic rotary joint, slip rings offer a number of benefits:
The smooth and continuous transmission of power, data and signals between rotating and stationary parts is crucial across many applications, especially in defence and other critical military and industrial fields. Engineers and designers must access the latest technologies and advances in key components to ensure optimal system performance. Bearings are a critical part of this equation, and advancements in their design, such as the integration of Slip Rings and Thin Section Bearings, have made them indispensable. Carter Manufacturing, in collaboration with
Silverthin, excels in integrating thin section bearings into slip rings. These designs enable reliable communication and power flow without limiting rotation, an essential feature for
Transmission of various signals Slip rings facilitate the transfer of critical signals like Ethernet, CAN-bus, HDMI, and USB. This capability is crucial in data-driven sectors like defence and industrial automation, where real-time data exchange enhances performance and accuracy.
Longevity and reduced wear Engineered with Silverthin precision technology, slip rings are designed for continuous rotation with minimal maintenance, significantly extending equipment lifespan. They provide reliable solutions for challenging environments like deep-sea exploration or remote control operations, where frequent maintenance is impractical.
36 DESIGN SOLUTIONS DECEMBER/JANUARY 2025
Customisation for specialised environments Slip rings, including those utilising Silverthin thin section bearings, can be tailored for extreme environments such as high altitudes, intense temperatures, and corrosive conditions. This flexibility ensures their suitability for applications ranging from defence radar systems to heavy- duty industrial machinery.
Enhancing Safety and Efficiency Slip rings reduce the need for complex wiring, eliminating hazards associated with flexing cables. This feature is particularly vital in high- speed or high-vibration applications where safety and durability are critical.
Compact and lightweight design The compact and lightweight design of Carter slip rings, powered by Silverthin technology, makes them the ideal choice for space-critical applications. Whether in medical imaging equipment or surveillance cameras, their reduced mass minimises rotational inertia, ensuring precision and energy-efficient performance.
Carter Manufacturing T: 01865 821720
www.carterbearings.co.uk
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