Transmission System

Functions Required of Bearings and the Belt Mechanism

A car's engine includes both:

• a timing belt mechanism that drives the camshaft, oil pump, etc.; and

• an auxiliary drive belt mechanism that drives the auxiliary machines such as the alternator, air conditioner, and water pump.

Because the bearings are mounted on the engine, they have to be reliable in high-speed rotation and high temperatures.

Tensioner and Idler Bearings

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.

Structure

Sealed-type deep groove ball bearings are used, and the idler pulley and mounting bracket are of dimensions and shapes suited to the type of engine. There are several types, such as a pulley-integrated type and a toothed type, and some of them are significantly lighter with reinforced resin pulleys 

Features

1.By using materials such as seal and grease that work under high-speed rotation and high-temperature conditions, they improve reliability.

2.By adapting them to severe driving environments and severe weather conditions, they improve the anti-penetration potential against muddy water and dust.

3.A reinforced resin pulley with excellent heat resistance and chemical resistance is used to significantly reduce the weight.