Gears play an irreplaceable role in our lives and production.It is precisely because of its important position that it is required to operate frequently in various machinery, which will cause the failure of gears and various mechanical failures.What are the common failure modes of gears?What is the cause?Today, Ever-Power Machinery, a gear manufacturer, will summarize for you:

    1. Tooth surface wear

    For open gear transmission or closed gear transmission without clean lubricating oil, due to the relative sliding between the meshing tooth surfaces, some hard abrasive particles can easily enter the friction surface, thereby changing the tooth profile, increasing the backlash, and making the gear more and more The thinner it then causes the gear to break.Under normal circumstances, only when the lubricating oil contains abrasive particles, it is possible to cause wear of the tooth surface abrasive particles during the working process.

    2. Tooth surface gluing

    For high-speed and heavy-duty gear transmissions, due to the high friction and relative speed between the tooth surfaces, the temperature in the meshing zone is too high and the lubrication conditions are poor, resulting in the disappearance of the oil film between the tooth surfaces and direct contact between the metal surfaces of the two wheels. glued.When the two tooth surfaces continue to move relative to each other, the harder tooth surface will tear part of the material on the softer tooth surface along the sliding direction to form a groove.

    3. Fatigue pitting

    When two gears are in contact with each other, the contact stress on the working surface is caused by the force and reaction force between the tooth surfaces.Due to the change of the position of the meshing point and the periodic movement of the gear, the contact stress changes with the change of the movement period.Under the action of long-term alternating contact stress on the tooth surface, small cracks will appear at the knife mark of the tooth surface.As time goes by, this kind of crack gradually spreads laterally on the surface.After the crack forms a ring, the tooth surface will spall in a small area and form some fatigue shallow pits.

    4. Broken gear teeth

    When the periodic stress at the root of the gear subjected to pulses exceeds the fatigue limit of the gear material, cracks in the tooth root will appear and gradually expand. When the rest of the gear cannot bear the transmission load, when the rest cannot bear the transmission load, Tooth fracture will occur.Gears can also be damaged due to severe shocks, unbalanced loads and uneven materials.

    5. Plastic deformation of tooth surface

    Under the action of impact load and heavy load, the tooth surface is prone to local plastic deformation, which deforms the surface of the involute tooth profile.

    Understand the failure modes and causes of the above gears, and through various countermeasures, the failure of gears can be avoided and reduced in time.To ensure production efficiency and reduce production costs.