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2024

New Product
NTN Expands “Low Friction Hub Bearing” Series
May 16, 2024New Products

  • Adding new products, “Low Friction Hub Bearing IV” with low torque grease for seal and “Low Friction Hub Bearing V” with low torque grease for inside of bearing to the Series.
  • Reducing friction by up to 64% and improves electricity efficiency by 0.75% compared to the conventional products

NTN Corporation (hereafter, NTN) has developed new products with further low friction characteristic, “Low Friction Hub Bearing IV” and “Low Friction Hub Bearing V”. We will propose these products to global customers as the “Low Friction Hub Bearing” Series that reduces rotational friction by up to 64% in compared to the conventional product, contributing to the reduction of fuel and electricity efficiency for a wide range of vehicles including electric vehicles (EVs) and hybrid electric vehicles (HEVs).

Photo:“Low Friction Hub Bearing V” “Low Friction Hub Bearing V”
Photo:Applied area of hub bearings (marked in red) Applied area of hub bearings (marked in red)

<Background of development>

Hub bearings support rotation of tires. In 2009, NTN developed the “Low Friction Hub Bearing” that reduces rotational friction while satisfying basic performance requirements such as operating life and strength. Since then, we have been pursuing further low friction characteristic through improvements such as reducing the number of seals lips by installing labyrinth structure on inner seal and reducing each grease viscosity. We have supplied these products as the “Low Friction Hub Bearing” Series. This series has been highly regarded for its low friction characteristic, and contributes to improving fuel and electricity efficiency in many vehicle models.

In order to realize a decarbonized society, the development/popularization of EV has been accelerating. To extend cruising distance, it is necessary for vehicles to achieve further electricity efficiency from various aspects. As a result, hub bearings are also required to further reduce friction. In response to this need, NTN developed “Low Friction Hub Bearing IV” in 2023, an improved product of its predecessor, then newly developed “Low Friction Hub Bearing V” this time.

<Low Friction Hub Bearing IV>

This product adopts the newly developed low torque grease for outer seal and inner seal. In addition to reducing base oil viscosity of grease, the size of thickener, which retains base oil and makes it semi-solid, is reduced. Reducing the size of thickener reduces the amount of thickener while maintaining retention of base oil, resulting in reducing further grease viscosity. These improvements have reduced resistance caused by grease when seals are rotating and reduced rotational friction when driving as well.

<Low Friction Hub Bearing V>

In addition to improvements of the “Low Friction Hub Bearing IV,” this product adopts the newly developed low torque grease for the inside of bearing. While the grease viscosity is reduced by reducing the base oil viscosity and thickener size, grease consistency is optimized so that the grease separated by balls when rotating will not flow back into the raceway. By adopting this grease, the product reduces friction by up to 64% compared to the conventional product*1. It improves electricity efficiency by approximately 0.75%*2, enabling 3km extension*3 of cruising distance in a single power supply compared to the conventional product.

NTN will propose this “Low Friction Hub Bearing” Series globally to meet the diverse needs of customers and contribute to the reduction of fuel and electricity efficiency of vehicles and the further extension of cruising distance.

NTN will exhibit this product at “Automotive Engineering Exposition 2024 YOKOHAMA” to be held in Pacifico Yokohama from May 22 to 24.

  1. Conventional product which does not apply specification of “Low Friction Hub Bearing” Series
  2. Calculated based on NTN's calculations. (catalog data for medium-segment EV)
  3. Calculated using EV with cruising distance 400 km in a single power supply

Newly developed technologies

Figure:Newly developed technologies

<Comparison of Low Friction Hub Bearing IV and V>

Newly developed technology Low Friction Hub Bearing IV Low Friction Hub Bearing V
Low torque grease for inside of bearing
Low torque grease for seal

:Applied

“Low Friction Hub Bearing” Series

Table:“Low Friction Hub Bearing” Series

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