NSK reveals bearing line-up featuring a bioplastic cage

Following its development in 2021 of a bioplastic cage for rolling bearings, NSK can now reveal its initial product line-up. The new heat-resistant cage will be available on its 60 and 62 series of deep groove ball bearings.

Moving forward, NSK will continue expanding its product portfolio and the associated range of applications for OEMs looking to develop environmentally friendly products.

By manufacturing the bearing cage from a bioplastic material – which derives from renewable biomass sources (mainly plants) – it is possible to reduce lifecycle CO2 emissions by 91% in comparison with conventional plastics made from fossil fuels, thus contributing to carbon-neutral initiatives. As a point of note, conventional bioplastic components have suffered from low heat resistance, but tests show that the cage material selected by NSK can withstand operating temperatures of up 120°C.

NSK says typical applications include air conditioners and fan motors. Sales of new air conditioners are set to increase as they enter the price range of a growing number of households across Europe, while homes and workplaces with existing air conditioners are looking to upgrade due to the Covid-19 pandemic and the benefits that enhanced ventilation bring. Bearings are a key component within the fan motors of air conditioners. By taking advantage of NSK 60 and 62 series deep groove ball bearings and the 100% bioplastic cage brought to mass market, air conditioner OEMs can boost their sustainability credentials.

Bearings for air conditioner fan motors are required to exhibit low noise and friction, in addition to high reliability. NSK’s functional evaluation tests confirmed that bearings featuring the bioplastic cage have a noise and friction performance equivalent to that of conventional cages made from polyamide 66.

Ultimately, alongside its potential to help OEMs develop carbon-neutral products, the new bioplastic cage demonstrates equivalent strength, heat resistance, grease resistance and weld strength to that of polyamide 66, as well as comparable stiffness, fatigue resistance, creep resistance and impact resistance.

Moving forward NSK will continue expanding its use of bioplastics in products for other sectors, such as automotive, with a view to further reducing carbon emissions and contributing to the creation of a carbon-neutral society.