1. Damáiste meicniúil
In severe cases, metal peeling occurs on the touch surface, and large-area scratches will appear; usually, the mechanical damage of the linear motion bearing means that the alloy surface of the linear motion bearing bush shows different levels of groove marks. The first reason for the mechanical damage of the linear motion bearing caused by the damage of the touch surface and the ablated surface is that it is difficult to form an oil film on the surface of the linear motion bearing or the oil film is seriously damaged.
2. Imthacaí tairiscint líneach a chuimsiú
The surface layer is plastically deformed and hardened by cold working, and the sliding linear motion bearing is repeatedly affected by the pressure shock load of the cylinder. Part of it loses its ability to deform, gradually forms a pattern and continues to expand, and then as the grinding debris falls, the load surface of the surface layer forms a hole. Generally, when the linear motion bearing is cavitation, pits are formed first, and then the pits gradually expand and cracks are generated at the interface of the alloy layer, and the cracks expand in the parallel direction of the interface until the pits stop. The main cause of cavitation in sliding linear motion bearings is that the oil flow is very disordered due to the cross-section of layout elements such as oil grooves and oil holes. The vacuum zone where the oil is lost is adjusted to form bubbles, and then the bubbles collapse due to the increase in pressure. Cavitation usually exists in the high load area of the linear motion bearing, such as the lower linear motion bearing of the main linear motion bearing of the crankshaft.
3. Laigí
Due to the engine overload, the linear motion bearings are fragile and pitting. The operation of the linear motion bearing is overheated, and the gap of the linear motion bearing is too large, which constitutes fatigue damage in the middle of the linear motion bearing, and fatigue and pitting may be exhausted. Most of the damage is caused by overload, excessive clearance of linear motion bearings, maybe the smooth oil is not clean, and the interior is mixed with foreign matter. Therefore, the application should focus on avoiding overloads of linear motion bearings. Do not run at too low or too high speed; adjust the engine to a stable state when idling; ensure that the linear motion bearing clearance is normal to avoid excessive or low engine speed; check and adjust the operation of the cooling system to ensure that the engine's operating temperature is appropriate.
4. Cóimhiotal imthacaí tairiscint líneach a chreimeadh
The chemical impurities (acid oxides, etc.) in the smooth oil oxidize linear motion bearing alloys to form acidic substances. Corrosion of linear motion bearing alloys is usually a smooth oil impure. This causes the linear motion bearing alloy to partially fall, forming irregular small holes or small pits. The main reasons for the corrosion of linear motion bearing alloys are improper selection of smooth oil, poor corrosion resistance of linear motion bearing materials, and severe engine operation and high temperature.
5. Imthacaí tairiscint líneach a leá
The part is high temperature, and there is a small convex metal surface in direct contact between the journal and the conflicting pair of the linear motion bearing. In the absence of smoothness and poor cooling, the linear motion bearing alloy turns black or partially melts. This problem is usually caused by the tight fit between the journal and the linear motion bearing; the lack of smooth oil pressure will also cause the linear motion bearing to burn.