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News Release

September 28, 2017

Development completion of
long-life thrust needle roller bearing
-Bearing for automotive transmissions with 3.5 times or longer life-

JTEKT Corporation (hereinafter JTEKT) has developed a “long-life thrust needle roller bearing”, which achieves 3.5 times or longer life compared with conventional products.
 The thrust needle roller bearing contributes to the reduction of power loss and is commonly used for the automotive transmissions, air compressors, or such parts of automobiles since it is compact and can be used in environments which require relatively high load and high rotation speed.
 We contribute to the further weight-saving of vehicles and improvement of fuel efficiency with our developed product, and also replace currently volume-produced products with longer life ones.

Product appearance

<Product appearance>



The geometry of a thrust needle roller bearing causes “differential slide” due to the difference between internal and external circumferential speeds on the roller raceway. Thus, an issue of this bearing is flaking easily generated from the race surface.

(1) We added the shot peening process (technology to strengthen metallic material by shot-peening with a vast number of particles) in order to harden the race surface and apply the residual compressive stress as a countermeasure against “flaking from the race surface”. As a result, the life until flaking was improved to be longer.

(2) We also strengthened the roller through the special heat treatment based on assumption that the “roller flaking” can be generated more easily than “race flaking” because the life until race flaking was improved through the race strengthening.

-> Achieved 3.5 times or greater durability against flaking compared with conventional products

Structural figure of planetary carrier

[Structural figure of planetary carrier]



(1) Contributes to weight saving and fuel efficiency improvement of vehicles
An extended bearing life achieves a further size-reduction while maintaining the conventional life level. This contributes to the weight-saving and fuel efficiency improvement of vehicles.

(2) Able to extend life of existing volume production products
Since the long-life processing can be added to the conventional process, it is possible to replace to long-life bearings without changing the size of existing volume production bearings.
Even when the input torque is increased, a long-life technology can improve performance of existing products. Since the flow of lubricant is not required to be changed, changing points for the application development can be reduced, which eventually reduce the customer’s risk.

3.Sales plan

[Start of volume production] Year 2020
[Sales target]1 million 440 pcs/year
[Sales destination]Automotive manufacturers and transmission manufacturers in Japan and overseas

4.Production plant



JTEKT Corporation has newly created a tagline “Key of your operation Koyo” for the bearing brand “Koyo”. JTEKT will continue contributing to every industry including automotive manufacturers as an indispensable partner to solve customers' problems through working with customers and to provide benefits.