Timing Belt Take Appropriate Precautions And Corrective Action

There are many reasons for the failure mode of the timing belt, and sometimes the failure mode of the belt is difficult to determine. The purpose of the product application memorandum is to define, exemplify and determine the failure mode of the usual timing belt so that we can take appropriate precautions and corrective action.

After the belt is running for 2 to 3 years, when the core reaches the fatigue life, the belt failure is normal. After a long period of operation, the belt due to the core to reach the fatigue life and failure, which is the ideal belt failure mode.

A jagged rupture of the 45 ° angle of the jagged rupture belt, which is typical of the belt core to the normal fatigue life caused. The timing of the belt is also ineffective, but this is not an ideal belt failure mode. In the long run, although the belt can maintain the initial size and shape, but the belt teeth will wear. Belt canvas exposed fiber will make the belt teeth look rough and dry,

The belt after 2 to 3 years of operation does not require any further improvement. Belt life will be due to the different applications, as well as a variety of objective factors have a greater change. Factors that affect belt life include transmission power rating, environment, belt mounting tension, belt-to-wheel matching, pulley quality level, and even how to cut, package, transport and install belts. Belt bending failure mode is usually expressed as a broken surface of the core line in a straight line.

This failure mode occurs when the belt core is bent to a very small diameter. A sharp bend causes the belt core fibers to bend and damage under enormous pressure, resulting in a decrease in the tensile strength of the belt. Belt bending failure is the most common failure mode, usually with the belt improper operation, the installation of tension is too low, the wheel diameter is too small and the wheel with foreign matter and so on.

Due to improper operation caused by the belt bending reasons are: improper storage, improper packaging and belt installation and installation before the improper operation. The belt may be tilted until it reaches an acceptable tension, which is called automatic tensioning. Automatic tension in the belt of the loose edge or belt teeth into the drive wheel groove where the most clearly observed. When the belt is automatically tensioned, the belt teeth will jump out of the pulley groove until the belt tightening of the tension to force the belt teeth and then into the pulley groove. When the belt is forced back to the wheel groove, it often causes the belt and pulley contact point to be violently and instantly bent, which causes the belt core to be damaged. This part of the core damage is called the bend. If the tight side of the tension can not make the belt teeth into the pulley groove, the belt will produce jump teeth, also will produce bending failure or belt tooth damage.