DNT En develop torque by 50% of the gearbox with the thrust needle bearing
DNT En (NTN) has developed a torque lower than 50% of the thrust needle bearing "low torque thrust needle roller bearings." Gasoline is expected to improve the fuel efficiency and hybrid transmission.
The new product is aimed at producing torque thrust needle roller bearings developed two elements: one for "roller" in the bearing inner and outer rings caused by different walking distance of "roller" slide in the track surface and place " roller slide and the loss of rail wheels. " The other is from the guide "roller" to maintain the smooth movement device and the "roller" contact occurred "roller and cage sliding losses."
The former (with the track roller slide round loss) is reduced through the use of "all convex roller (full-crowningroller)" implementation. All convex roller made of a spherical-shaped end (end of the cross section for the arc-shaped). The thrust needle roller bearings used in the past, cutting convex roller (cut-crowningroller) the end of the cone units (end of the cross section is trapezoidal). Through the use of all convex roller, not only shortened the roller contacts with the track wheel part of the contact length, but also reduces roller walking distance of the difference between inside and outside the ring, thus reducing sliding loss.
The latter (roller and cage sliding loss) is reduced by the all-convex roller, and to improve the retainer and roller contact with some of the retainer contact surface shape to achieve. Specifically to enhance the contact surface to maintain precision devices to interface more smoothly, so that the lowest speed week end center roller in contact with the retainer.
With these improvements, not only reduces the torque, but also will be running bearing temperature rise at a lower level of inhibition.
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