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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 a tapered roller bearing?

A tapered roller bearing is a bearing in which tapered rollers (truncated conical rollers) are inserted between the cup (outer ring) and cone (inner ring). The rollers are guided by the cone back face rib.

They have high radial and axial (thrust) load capacities at low to intermediate speeds. Taper roller bearings are available in single-row, two-row and four-row designs. With single-row bearings, the thrust load capacity is about 60% of the radial capacity. Double-row bearings have a greater radial load capacity and can handle thrust loads from both directions. The rollers can be configured so that the contact lines to the races converge or diverge towards the axis of rotation. Diverging double-row bearings increase the rigidity of the shaft mounting, but converging bearings do not. Other configurations for double-row bearings feature a single outer ring and two inner rings, or two outer rings and a single inner ring. Four-row tapered roller bearings consist of four rows of alternating converging and diverging rollers.


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