Assessment Indicators Of Automobile Tooth Gear

  •   The life of an Automobile Tooth Gear is mainly assessed by two indicators, one is the contact fatigue strength of the gear, and the other is the bending fatigue strength of the gear. The former is mainly determined by the quality of carburizing and quenching, and the latter is mainly determined by the gear material.

      1. Fatigue pitting

      When the two gear teeth meshing with each other are in contact, the action force and reaction force between the tooth surfaces cause contact stress on the two working surfaces. Since the position of the meshing point changes and the gear moves periodically, the contact stress is According to the pulse cycle change. Under the action of this alternating contact stress on the tooth surface for a long time, small cracks will appear at the tool marks of the tooth surface. With the passage of time, the cracks gradually expand laterally on the surface. The surface of the tooth produces a small area of ​​spalling and some fatigue craters are formed.

      2. Broken gear teeth

      Gears under load in operation engineering are like cantilever beams. When the periodic stress of pulses at the root exceeds the fatigue limit of the gear material, cracks will occur at the root and gradually expand. When the remaining part cannot bear the transmission load, it will occur. Broken teeth. Gears may also break teeth due to severe impact, eccentric load and uneven material during work.

      3. Plastic deformation of tooth surface

      Under impact load or heavy load, the tooth surface is prone to local plastic deformation, so the curved surface of the involute tooth profile is deformed.

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