Pay attention to these problems in the maintenance of plastic gears
Time:
2021-07-15
Have you noticed these points of the equipment products and plastic gears you usually buy? It can extend the overall life span! If the plastic gear fails, the entire equipment will be involved, so we must pay attention to the maintenance of the plastic gear. Now follow the editor of Youtai to pay attention to these points that gears are prone to failure!
Have you noticed these points of the equipment products and plastic gears you usually buy? It can extend the overall life span! If the plastic gear fails, the entire equipment will be involved, so we must pay attention to the maintenance of the plastic gear. Now follow the editor of Youtai to pay attention to these points that gears are prone to failure!
1. Tooth surface wear
For open gear transmissions or closed gear transmissions containing dirty lubricating oil, due to the relative sliding between the meshing tooth surfaces, some harder abrasive particles enter the friction surface, which changes the tooth profile and increases the backlash. As a result, excessive thinning of the gear causes tooth breakage. Under normal circumstances, only when the lubricating oil is mixed with abrasive particles, the tooth surface abrasive particles will wear out during operation.
2. Tooth surface gluing
For high-speed and heavy-duty gear transmissions, due to the large friction between the tooth surfaces and the high relative speed, the temperature in the meshing zone is too high. Once the lubrication conditions are poor, the oil film between the tooth surfaces will disappear, making the metal of the two teeth The surfaces are in direct contact, and mutual bonding occurs. When the two tooth surfaces continue to move relative to each other, the harder tooth surface tears part of the material on the softer tooth surface along the sliding direction to form grooves.
3. Fatigue pitting
When the two meshing gear teeth contact each other, the 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 pulsation cycle. Under the action of this alternating contact stress on the tooth surface for a long time, small cracks will appear at the knife marks of the tooth surface. As time goes by, this kind of crack gradually expands on the surface layer laterally. After the crack forms a ring, the wheel The surface of the tooth produces a small area of spalling and forms some fatigue pits.
4. Broken gear teeth
In operation engineering, a gear that bears a load is like a cantilever beam. When the periodic stress at the root of the gear exceeds the fatigue limit of the gear material, cracks will occur at the root and gradually expand. It will occur when the remaining part cannot withstand the transmission load. Tooth broken phenomenon. Gears may also cause tooth breakage due to severe impact, eccentric load and uneven material during work.
5. Plastic deformation of tooth surface
Under impact load or heavy load, the tooth surface is prone to local plastic deformation, which deforms the curved surface of the involute tooth profile.
1. Tooth surface wear
For open gear transmissions or closed gear transmissions containing dirty lubricating oil, due to the relative sliding between the meshing tooth surfaces, some harder abrasive particles enter the friction surface, which changes the tooth profile and increases the backlash. As a result, excessive thinning of the gear causes tooth breakage. Under normal circumstances, only when the lubricating oil is mixed with abrasive particles, the tooth surface abrasive particles will wear out during operation.
2. Tooth surface gluing
For high-speed and heavy-duty gear transmissions, due to the large friction between the tooth surfaces and the high relative speed, the temperature in the meshing zone is too high. Once the lubrication conditions are poor, the oil film between the tooth surfaces will disappear, making the metal of the two teeth The surfaces are in direct contact, and mutual bonding occurs. When the two tooth surfaces continue to move relative to each other, the harder tooth surface tears part of the material on the softer tooth surface along the sliding direction to form grooves.
3. Fatigue pitting
When the two meshing gear teeth contact each other, the 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 pulsation cycle. Under the action of this alternating contact stress on the tooth surface for a long time, small cracks will appear at the knife marks of the tooth surface. As time goes by, this kind of crack gradually expands on the surface layer laterally. After the crack forms a ring, the wheel The surface of the tooth produces a small area of spalling and forms some fatigue pits.
4. Broken gear teeth
In operation engineering, a gear that bears a load is like a cantilever beam. When the periodic stress at the root of the gear exceeds the fatigue limit of the gear material, cracks will occur at the root and gradually expand. It will occur when the remaining part cannot withstand the transmission load. Tooth broken phenomenon. Gears may also cause tooth breakage due to severe impact, eccentric load and uneven material during work.
5. Plastic deformation of tooth surface
Under impact load or heavy load, the tooth surface is prone to local plastic deformation, which deforms the curved surface of the involute tooth profile.
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