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By Product group

KOYO brand bearings from JTEKT are found virtually anywhere where accurate rotational control is required

JTEKT Corporation is one of the world’s leading manufacturers of bearings and automotive steering systems.

At JTEKT we are focused and committed to deliver our customer high quality products and the best solutions because they are at the core of everything we do. By combining technology with our design engineering expertise we are able to offer a breadth of advanced bearings and solutions which are well known under the KOYO brand.

KOYO brand bearings from JTEKT are found virtually anywhere where accurate rotational control is required. Bearing applications vary from jet engine main shaft support, manufacturing equipment used to produce semiconductors and LCD displays, through modern windmills, automobiles, high-speed trains and agricultural machinery to medical equipment, drilling machines at your dentist’s surgery and various appliances at your household. We are proud to say: our bearings are found from the heights of the stratosphere to the depths of the ocean – many specially developed to function with optimum efficiency in harsh environments such as weightless or extremely corrosive conditions. In short, you will find Koyo bearings wherever there is a need for innovative engineering and reliability that will last.

Product Range

The size range of Koyo bearings is truly vast: from tiny examples of 1 millimeter inside diameter to huge bearings measuring 7 meters on the outside. JTEKT designers and development engineers pride themselves on their ability and willingness to work in close liaison with their customers to develop bearings for specific new applications, or to refine and improve existing product technology. Our Koyo branded bearings includes a broad range of rolling bearings, accessories and systems. At our production section you will get an initial impression of what we can offer.

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Bearing 3D

What is an angular contact ball bearing?

An angular contact ball bearing uses axially asymmetric races. An axial load passes in a straight line through the bearing, whereas a radial load takes an oblique path that tends to want to separate the races axially. So the angle of contact on the inner race is the same as that on the outer race. Angular contact bearings better support "combined loads" (loading in both the radial and axial directions) and the contact angle of the bearing should be matched to the relative proportions of each. The larger the contact angle (typically in the range 10 to 45 degrees), the higher the axial load supported, but the lower the radial load. In high speed applications, such as turbines, jet engines, and dentistry equipment, the centrifugal forces generated by the balls changes the contact angle at the inner and outer race. Ceramics such as silicon nitride are now regularly used in such applications due to their low density (40% of steel). These materials significantly reduce centrifugal force and function well in high temperature environments. They also tend to wear in a similar way to bearing steel—rather than cracking or shattering like glass or porcelain.

Most bicycles use angular-contact bearings in the headsets because the forces on these bearings are in both the radial and axial direction.

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