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Inappropriate use of the damage caused by the "results and reasons revealed"
Source: China Bearing Network Time: 2013-01-22
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The reason is: the axial clearance of the crankshaft is too large or too. The 蓟嵩 汕嶂 汕嶂 汕嶂 汕嶂 汕嶂 汕嶂 汕嶂 汕嶂 汕嶂 在 在 在 在 在 è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘Damage to the seven spindles. Avoid the onset of such problems; it is necessary to ensure that the axial clearance of the crankshaft is at a scale of 0.18 to 0.35 mm in the engine unit.
2. After the engine is started, it will directly enter the high-speed operation and full-load operation to damage or damage the bearing bush: the seventh and sixth spindles of the engine are severely worn; other bearing bushes are damaged.
The reason is: no air load heating operation is carried out after the engine is started; high-speed operation and full-load operation are put into operation. Since the engine does not reach the working temperature requirement; the force contact surface and the working space of each part do not enter the optimal condition; and the temperature is low. The smooth oil has poor fluidity; the heat of each sports surface cannot be agilely removed by smooth oil; it will constitute damage or damage to the bearing bush. The lower the external temperature, the more severe the damage to the bearing bush. It is necessary to follow the rules to avoid the onset of such problems. Warming operation; after the engine is started, the medium and low speed operations are carried out; when the engine water temperature rises above 70 °C, it is put into operation.
3. The one-side bearing bush wears severely on one side; the central bearing bush wears more severely than the two-sided bearing bush.
The reason is: the deformation of the bushing hole is tapered, and the crankshaft is bent. The reason for the crankshaft bending is that the working gap is uneven, the associated parts are severely worn or the oscillation of the damage occurs, and the balance damper fails. The balance damper failure can also constitute the crankshaft cracking. ), when the bearing device is positioned, some orientations are not aligned or reversed: the upper and lower tiles are not aligned with the oil hole.
4. The damage and damage caused by the engine stopping after a long time operation (shutdown): the outer surface of the bearing alloy is worn; the uneven outer alloy is displaced from the center to both sides.
The reason is: the engine is after a long time of heavy load operation; the internal parts are at the highest operating temperature; especially the combustion chamber is at a high temperature; after the engine is stopped; the cooling system and the smooth system stop the operation; the heat does not go out. Increase the temperature of the associated parts; damage the oil film on each smooth surface; when re-starting; when the oily surface of each smooth surface is not yet formed; the abnormal wear of the bearing bush has already occurred. Especially for the sliding bearing of the supercharger The damage is more severe; the excessive temperature will constitute the deformation of the shaft hole; the accuracy of the damage will accelerate the damage of the engine. The appearance of this phenomenon will cause severe damage to the piston, cylinder liner and cylinder seal. Therefore, the engine is long. After a large load operation, the engine should be idle for at least 10 minutes at low speed; the internal temperature will drop again in the future.
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