Automotives Bearings

The outer rings of two single-row bearings are integrated with each other, the unit is greased and sealed. There are two types: DAC, which uses balls, and DU, which uses tapered rollers.

This is a further development on the 2nd-generation hub unit. These hub units have an integration of the hub shaft and inner ring on the outer side (tire side) of the inner ring rotation type, and the number of 3rd-generation hub units with built-in high-performance sensors is growing. For driven wheels, the method of fastening the hub shaft and inner ring with nuts has been changed to the "shaft end clinching" method.

The timing and auxiliary belts are equipped with idler bearings with pulleys and brackets attached to them.
Of these, in the timing belt mechanism, the type with a slotted hole in the inner ring or a bracket for tension adjustment is sometimes called the "tensioner bearing," and the type without an adjustment mechanism is sometimes called the "idler bearing."
Auxiliary idler bearings are also used in auxiliary drive belt mechanisms.

The outer ring of the 1st-generation hub unit is integrated with the flange. These hub units are divided into two types based on which of their rings rotates. In the outer ring rotation type, the wheel is attached directly to the outer ring; this type is only used for the driven wheels. In the inner ring rotation type, the hub shaft is attached to the inner ring; this type is used for both the driving wheels and the driven wheels.

A "clutch" is a device that either transmits driving force from the engine to the transmission or shuts it off, without stopping the engine.
JTEKT's bearings are equipped with a centering mechanism to prevent damage caused by sudden high-speed rotation during transmission of the driving force. In addition, some reduce weight by using steel plate presses for the bearing rings.