Tensioner & Idler bearings

Technical Information

Timing Belt System

A timing belt camshaft drive system comprises of belt, drive and driven pulleys, idlers, and tensioner. Tensioner & idler are not a power transmission component. They provide the life-of-engine tension control when installed and additional belt wrap.

1 – Cam Shaft

2 – Idler

Generally, located on the tight-side, it increases the belt-wrap angle of component to prevent tooth skip belt span vibration.

3 – Tensioner

Generally, located on the slack-side, it contributes synchronous driving cam and crank for providing initial belt tension of system.

Structure

A tensioner is one of automotive components which applies a force to create or maintain engine belt tension. There are several types of tensioners.
Fixed tension type, spring tension type, and hydraulic type.

Fixed type : T/I

Hydraulic type : HAT

Spring type : TBT

Spring type : ADT

Product Types-For Timing System

Idler

Outer ring & Pulley Integrated
Inner ring & shaft integrated

Tensioner

Inner ring & shaft integrated
Steel Pulley with bracket

Idler

Inner ring & shaft integrated
Steel Pulley

Tensioner

Ball bearing type
Steel Pulley & shaft with eccentric hole

Product Types-For Accessory System

Flat Steel Pulley

Flat Plastic Pulley

Groove Steel Pulley

Groove Plastic Pulley

Function

Provides constant tension to the belt to prevent slip or noise
Prevents belt tooth skip
Dampens belt vibrations caused by engine firing
Compensates for effects of engine thermal expansion and contraction on timing drive

Advantage

Wide range of applications
(Timing belt system & accessory belt drive system)
GMB tensioner and idler bearings have met rigorous requirements from car manufacturers

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