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Company

Company

Koyo Seiko was founded in 1921 by Mr. Ikeda. In the decennia that followed it has become one of the world’s leading manufacturers of bearings and automotive steering systems.

Koyo Seiko was founded in 1921 by Mr. Ikeda. In the decennia that followed it has become one of the world’s leading manufacturers of bearings and automotive steering systems.

With the merge of Koyo Seiko Co., Ltd. and Toyoda Machine works, Ltd. on January 1, 2006 JTEKT Corporation came into existence. Nowadays with a Head Office in Osaka, Japan, JTEKT Corporation has global operations in Europe, Asia, U.S and Latin America.

With activities focused on four major areas: bearing, steering, driveline and machine tools JTEKT aims at meeting the high expectations of its customers and winning the trust of the society. Highest business standards and a firm technological base combined with the engineering capabilities are JTEKT’s bedrock of growth and innovation. JTEKT’s ambition is to be among the world's top 10 automotive parts suppliers. In its four product divisions it will therefore continue to pursue excellence in product quality and reliability. JTEKT Corporation is presently the leading steering systems maker in Japan and the No. 2 maker worldwide. Through consistently high levels of product quality and performance, JTEKT has earned the respect and trust of automakers and industrial manufacturers around the world. It was equally the first maker to develop electric and hydroelectric power steering systems. (more info: www.jtekt-hpi.com)


Koyo Bearings

Koyo is the JTEKT Corporation brand for Bearings. JTEKT engineering and manufacturing capabilities range from super large bearings with outer diameters of seven meters to miniature bearings with inner diameters as small as one millimeter. Utilizing new materials and the latest in manufacturing technology, JTEKT Corporation has developed hybrid ceramic bearings and a variety of extreme special environment bearings to meet the increasingly severe and demanding requirements of modern industries. JTEKT Corporation stands at the forefront, as a technological leader in the world bearing industry.

JTEKT Corporation owns and operates eighteen bearings plants in seven countries and 6 R&D Technical Engineering Centers on three continents. Koyo offers innovative solutions to both original equipment manufacturers and aftermarket end users focusing on key markets such as automotive, agriculture and construction, heavy industry (steel & wind mill), gear, reducer, electric motor and general machinery.
Koyo brand has established itself with automakers and industrial manufacturers around the world and has attained ISO/TS 16949 certification at all of our bearing manufacturing and sales facilities.


Others

In addition, JTEKT Corporation utilized the technical base established through the four main products areas to develop complementary lines, such as factory automation, various precision instruments, heat treatment furnaces, electronic devices and others. For additional information on JTEKT Corporation's operations, visit our corporate website at: www.jtekt.co.jp/e

Bearing 3D
FAQ

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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