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News Release

September 26, 2016

Development of high speed rotation deep groove ball bearings

JTEKT Corporation (hereinafter called “JTEKT”) has newly created a tagline “Key of your operation Koyo” for the bearing brand “Koyo”. JTEKT contributes to every industry as an indispensable partner to solve customers' problems through working with customers and to provide benefits.
 For the bearings used mainly for the motors of hybrid vehicles (HV) and electric vehicles (EV), we have developed a new deep groove ball bearing with more improvement in high speed performance through devising the shape of the resin cage.
 JTEKT will further explore engineering and promote the development of good product with customers as a presence to deliver happiness to manufacturers and general customers.

1.Detailed description


Deep groove ball bearings are used to the motors for HV and EV, but the demands for bearings that meet high speed due to the size reduction of motors are increasing. Since the conventional cage for the deep groove ball bearings for this application was a single-support type, problems such as deformation from centrifugal force was large and seizure caused by the temperature rise due to the strong touching to the balls were generated.
 The structure for cage of this developed product was changed to dual-support type which has the same-shaped resin cages combined, and the shape of the fitting part is devised to suppress the deformation from centrifugal force, which achieves 1.3 times higher speed of rotation compared with the conventional type. (Oil lubrication type: “Limiting speeds: 40,000min-1”, “dmn value: 2 million”)
We are aiming to expand the sales of this product mainly to automotive manufactures and transmission manufactures.

min-1: Rotation speed per minute
dmn value: Value to indicate bearing performance
 (Pitch circle diameter (mm) x Rotation speed (min-1)

2.Sales Plan


[Sales target]200 million yen/year
[Sales destination] Automotive manufacturers, transmission manufactures, etc.

3.Production Plant


Kameyama Plant, Tokushima Plant, DAIBEA Co., Ltd. (JTEKT’s group company), etc.

<Product appearance>/<Appearance of resin cage>/<Cross section of bearing>

<Schematic structure of the conventional product>/<Schematic structure of the developed product>