KOYO bearings

January 16, 2020

KOYO bearings

Koyo (Koyo Seiko Co., Ltd.), founded in 1921, is a Japanese company that manufactures R & D comprehensive functional products and has 6,557 employees. Koyo Seiko Co., Ltd. is one of Japan's four major bearing production groups. With world-class production and control equipment, it has eight national branches in Japan, including Tokyo, Nara, Yintian, Toyohashi, Takamatsu, Tokushima, and Kameyama Main production plants (all passed ISO9001 certification), overseas production bases and research institutions in Europe, Asia, North and South America
Chinese name
KOYO bearings
Point of sale
28 places
Japan Ranking
the third

Company Profile

latest company news about KOYO bearings  0
Koyo Koyo Bearing KOYO shaft was founded in 1921, has 8 factories in Japan, 28 sales points, 9 production plants and 24 sales points abroad. Koyo Seiko Co., Ltd. is a global comprehensive bearing product manufacturer with a long history and culture. It produces a variety of bearings that are widely used in general machinery and other industries, as well as in Japan's ranked professional field. Users around the world China enjoys high reputation and praise for the quality of friendship.
Koyo (Koyo Seiko Co., Ltd.) and Toyota Koki Co., Ltd. merged on January 1, 2006. The combined company will be called JTEKT Corporation.
Company development in China
Koyo (Koyo Seiko Co. , Ltd.) 'S market share in China has been unknown since 1992, and today it ranks behind Sweden's SKF, Germany's FAG, INA, and Japan's NSK bearings. We can see that Koyo bearings have been recognized and favored by domestic customers in terms of quality and after-sales management. This is worthy of reference for our domestic brand bearings in terms of production and promotion.

Operating items

latest company news about KOYO bearings  1
Koyo Seiko Co., Ltd.'s business projects include bearings, automotive steering gear, automotive instruments, constant velocity joints, oil seals, work machinery, industrial heat treatment furnaces and electronic controllers. The company has substantially increased the production capacity of overseas automobile steering gears. It has steering gear production bases in Thailand, Malaysia, India, South Korea, and China, becoming the number one manufacturer of steering gear systems in Japan and the world's second largest.
Japan Koyo Seiko Co., Ltd. produces tens of thousands of high-precision, high-quality KOYO bearing series products, providing aerospace technology, computer components, motors, high-speed trains, MRT trains, industrial machinery, CNC lathes, high-precision processing machines, Automobile, motorcycle industry, steel industry ... and other important components, make the best choice
Koyo Bearing achieved sales of bearings of 186.7 billion yen, auto steering gears of 119.3 billion yen, and other products of 55.1 billion yen in 1999, accounting for 52%, 33%, and 15% of total sales, respectively.

Leading products

The leading products of Japanese KOYO bearings are: KOYO rolling bearings, KOYO deep groove ball bearings, KOYO high-precision bearings, KOYO self-aligning bearings, KOYO block bearings, KOYO flat ball bearings, KOYO short cylindrical roller bearings, KOYO linear guide bearings, KOYO balls Screw bearings, KOYO miniature linear guide bearings, KOYO cross roller guide bearings, KOYO reciprocating rotary bush bearings, KOYO ball-slide group bearings, KOYO cam follower bearings.

Routine inspection

The allowable measurement error can in principle allow the measurement error to be less than 10% of the tolerance.
In order to reduce the measurement error, the radius of the probe and the pressure of the gauge must be reduced to the extent possible, and the radius of curvature of the probe must be increased. When measuring the inner and outer diameters of KOYO bearings, the measuring force and the radius of curvature of the probe can be selected by reference.

Measurement area regulations

For the measurement of the inner or outer diameter of KOYO bearings, domestic regulations stipulate that they are measured within a region with a maximum chamfered coordinate on the south end surface of the leaving ring, while foreign regulations are generally defined as areas with twice the chamfered coordinates on each end surface of the ferrule. Measured within.

Dimension benchmark requirements

When using the comparative measurement method to measure the KOYO bearing dimensional tolerance, the gauge block or standard part is required as the dimensional reference for the comparative measurement. The gauge block must meet the requirements of the standard JB / T1078 "Gage Block", and the standard part must meet the manufacturer's supervisor. Departmental regulations.

Temperature conditions during measurement

The ambient temperature during measurement is specified as 20 ° C. The temperature of KOYO bearings, gauge blocks, standard parts and measuring instruments must be the same. The above method of placing them on the same metal plate can achieve the necessary temperature balance as quickly as possible Otherwise it would take hours or even days
Can reach such a balance.

company's history

August 1983 (Showa 58) Koyo Automatic Co., Ltd. developed the world's first electronically controlled power steering gear
October 1984 (Showa 59) Jointly developed ceramic bearings with Toshiba Corporation
1986 (Showa 61) January construction of Toyohashi Branch of Koyo Automatic Co., Ltd.
1987 (Showa 62) Merged Koyo Automatic Co., Ltd. in April to become Nara branch and Toyohashi branch
Production of the world's first electric power steering gear began in March 1988 (Showa 62)
Established TRW KOYO STEERING SYSTEMS COMPANY (currently TENNESEE KOYO STEERING SYSTEMS COMPANY) in a joint venture with TRW INC. In the United States in April to build a branch in Tennessee
1989 Established KOYO MANUFACTURING (THAILAND) CO., LTD. In March, Heisei, began to produce bearings in Thailand
Completion of the Technology Pavilion in July
KOYO BEARINGS (EUROPE) LTD. Was established in the UK in February 1990 (Heisei 2), and bearing production started
Construction of Guishan branch started in May
Established T & K AUTOPARTS SDN. BHD. In joint venture with Toyota Motor Corporation in July, and started production of bearings in Malaysia
Participated in investment and technical assistance in November in France SOCIETE DE MECANIQUE D'IRIGNY SA (now KOYO STEERING LYON SAS)
In June 1991 (Heisei 3), the North American Technology Center was established in Michigan, USA as a North American R & D base
Established the European Integration Center in the Netherlands in November to unify European operations
In July 1992 (Heisei 4), he participated in investing in SONA STEERING SYSTEMS LTD. (Now SONA KOYO STEERING SYSTEMS LTD.) In India.
In March 1993 (Heisei 5), the company acquired additional shares of French SOCIETE DE MECANIQUE D'IRIGNY SA (now KOYO STEERING LYON SAS) in March and acquired them as a subsidiary
In November, 7 branches including Kokubu, Tokushima, Tokyo, Iida, Kayama, Nara, and Toyohashi obtained ISO9002 international quality management system certification
In January 1994 (Heisei 2006), the Miniature and Small Diameter Bearing Division obtained ISO9002 International Quality Management System Certification
In April 1995 (Heisei 7), Chubu Koyo Bearing Co., Ltd. and Kyushu Koyo Bearing Co., Ltd. were merged into Koyo Bearing Sales Co., Ltd. At the same time, part of Koyo Seiko's sales business was transferred to establish Koyo Sales Co., Ltd.
KOYO STEERING (THAILAND) CO., LTD. Was established in April to produce steering gear in Thailand
Construction of KOYO CORPORATION OF USA second plant in Richland County, South Carolina, USA in June
In March 1996 (Heisei 8), all products such as bearings and steering gears obtained ISO9001 international quality management system certification
Established Yubei Koyo Steering Gear Co., Ltd. in joint venture with China Aviation Industry Corporation Yubei Machinery Factory and Okaya Steel Machinery Co., Ltd. in July to produce steering gear
In August, Dalian Guangyang Waxing Automotive Bearing Co., Ltd. was jointly established with China Wafangdian Bearing Group Co., Ltd. and Toyota Tsusho Corporation to produce automotive bearings
1997 (Heisei 9) Established FAW Koyo Steering Gear Co., Ltd. in January with China FAW Group Corporation and ITOCHU Corporation to produce steering gear
July QS9000 quality management system certification
European Technology Center was established in the Netherlands in November as a European R & D base
In February 1998 (Heisei 10), HYDROPERFECT INTERNATIONAL SA acquired all the shares of ENERFLUX INDUSTRIE SA (Blois, France), achieving serialization
Participated in the investment of Romanian bearing production company SCULMENTI ALEXANDRIA SA in March, and changed its name to KOYO ROMANIA SA (July)
Completion of the Comprehensive Technology Research Institute (Nara) in June
KOYO STEERING BRASIL LTDA was established in Brazil in July.
KOYO STEERING SYSTEMS OF USA INC. Was established in Virginia, USA in January 1999 (Heisei 11) as the second steering gear production base in the United States
Established steering unit European integration center in France in January
May R & D, design department and domestic production base all obtained ISO14001 certification
KOYO STEERING DIJION SAINT ETIENNE SAS was established in France in March 2000 (Heisei 12), and cooperated with French Peugeot to divert steering business
In September, reached an intention to jointly develop an electric power steering system with Toyota Koki Co., Ltd.
In March 2001 (Heisei 13), AICHI USA, Inc., a subsidiary of Aichi Steel, and KOYO CORPORATION OF USA jointly established KENTUCKY ADVANCED FORGE, LLC in the United States to produce and sell precision forged blanks.
Koyo Bearing Dalian Co., Ltd. was established in China to produce automotive bearings in March
Established ELECTRIC POWERSTEERING COMPONENTS EUROPE SRO, a joint venture with the Mitsubishi Electric Corporation in the Czech Republic in May, to produce and sell EPS electronic control equipment.
May Collaboration with Fuji Machinery Co., Ltd. on steering column business.
In November 2002 (Heisei 2014), FAVESS Co., Ltd. was established in a joint venture with Toyota Koki Co., Ltd., Denso Co., Ltd. and Toyota Motor Co., Ltd. to produce electric power steering systems.
Acquired ISO / TS16949 certification for the first time in Japan in December (2002 edition)
Established a sales company in China in December-Koyo Seiko (Shanghai) International Trade Co., Ltd.
2003 (Heisei 15) January Miniature and small diameter bearing business unit merged with Tokushima branch
In October, the United States TRW KOYO STEERING SYSTEMS COMPANY became a wholly-owned subsidiary, and was renamed as Tennessee Koyo Street Systems Company
Merged with Toyota Koki Co., Ltd. on January 1, 2006 to become JTEKT Corporation