The Analysis Of Motorcycle Gear Fatigue

There are many kinds of motorcycle gear, such as master and driving gear, fiddle with gear, begin gear, rear driving gear, balancing gear, timing gear, tachometer gear and fuel pump gear. Here is some analysis not quite some common gear damage, when gear tooth aim wear, gear fatigue and gear tooth broken.

We have discussed about the tooth position wear of motorcycle gear in last article. Here is the analysis on gear fatigue.

Tooth fatigue

There are two kinds, mechanical pitting or peeling.

Pitting is spots and pit upon the tooth approach even though the pit increase and become slice and after that peel from tooth face.

The specific reasons are:

Material is defect. There are too much nonmetaland brittle impurities inside the steel, or the fiber flow of steel and presidency of in force point of view is out of the ordinary and fatigue vibrancy is the lowest when it is 90.
Tooth slope decarburization. Carbon content is 0.3% ~ 0.6% or decarburized enlargement of the tooth outlook is 0.2 mm will cause fatiguecrack Carbon content is commonly 0.7% ~ 1.0% even if 0.8% ~ 0.9% is ideal.
Processing method of tooth face. Due to the interchange processing method, in the manner of gear hobbing, shaping and shaving, there will be a interchange angle betweenmeshing stock and acid mark, after that the contact fatigue cartoon of tooth viewpoint is with different. It is proved by practiced that the fatigue energy is longer if thecheap brakes are shaved
The tooth direction is too gruff or the error of tooth influence is too large.
Defect lubricant oil.

Resolution:

Ensure the tone of steeland use the purified melting
Ensure the quality of heat treatment, especially the intensity of hardening layer, the surface hardness and the surface carbon content, thus bearing in mind choosing those motorcycle sprocket, you obsession to pick high mood products to ensure the above indicators.
Use motorcycle gear withgear shaving management tooth surface.
Ensure the machining quality, cut the tooth tilt roughnessand insert the tooth accuracy.
Improve the lubrication conditions and talk to lubricating oilwith a proper viscosity.

Example:

Fault. Riding a motorcycle after 8000 km, speeding at 5 gear, there is unusual sound. edit motorcycle gear box, found that there is loud tooth pitting erosion, especially the driving gear.
Detection. Check the appearance, there is loud pitting erosion on the driving and drivengear, close showground line. see from the operational face, it is hobbing gear. The lubricating oil is fine. exam size of the idiosyncrasy parts, common normal heritage slightly gets smaller. hence it should bethe suffering during heat treatment, the surface carbon content is not enough, the all right is between 7% and 1.0%.
Analysis. From the above test, the main cause ofpersonal watercraft parts pitting should be heat treatment, surface hardness and surface carbon content didn’t achieve the standard. Hobbing machining is with a disadvantage.

We will continue the analysis of the last oddity of motorcycle gear in adjacent article.