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Analysis of Skills of Engine Sliding Bearings (5)
Source: China Bearing Network Time: 2018-01-23
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1. Damage and damage appearance caused by long idling operation time: the outer alloy layer of the bearing bush; being kneaded and displaced, flanging and flake off.
The reason is: the engine idling is too long; the engine is operating below the normal operating temperature; the fuel injected into the incineration chamber cannot be completely incinerated; some fuel that has not been incinerated flows into the crankcase along the cylinder wall; The oil film of the oil drops smoothly. The speed of the idling movement is low; the oil supply of the oil Pump. The é©® é©® èŠåµ¬å‘¤èŠ°Î¡ç »å¬—胫岬 èŠåµ¬å‘¤èŠ°Î¡ç »å¬—胫岬 èŠåµ¬å‘¤èŠ°Î¡ç »å¬—胫岬 åµ› 赡Σ 赡Σ 赡Σ 皇 皇 皇 皇 皇 皇 皇 皇 皇 皇 皇 皇 皇 皇 皇 皇If you want to avoid such problems, you should follow the operating rules; the idle work cannot exceed 5 minutes after each engine is started; Less than 850 rpm.
2. The damage and damage caused by the engine stop (shutdown) after long time operation: the outer surface of the bearing alloy is worn; the uneven alloy is displaced from the center to both sides.
The reason is: after the engine is loaded for a long time at a long time; the internal parts are at the highest operating temperature; in particular, some of the incinerators are at high temperatures; after the engine is stopped; the cooling system and the smooth system stop the operation; the heat cannot be dissipated. 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 at any time; let the engine run at low speed for more than 10 minutes at no load; the internal temperature will drop again in the future.
3. 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 engine load warming after the engine is started; it is put into high speed operation and full load operation. Because the engine does not reach the working temperature demand; the force touch surface and the working gap of each part are not in the best 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.
4. The appearance of damage or damage to the bearing bush due to adjustment and operation errors: the crankshaft thrust bearing (thrust ring) is severely worn or damaged; the seventh spindle shoe is damaged.
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.
4. The appearance of improper damage to the bearing bush or damage caused by the device:
1. The single shaft wear on one side is severe; the wear of the tile alloy is external.
The reason is: the deformation of the connecting rod exceeds the specification to ensure the scale, the bushing cover bolt consolidation torque is not uniform, the single side of the bearing bush is damaged when the device is installed, the bearing position of the bearing bush is inaccurate and the upper and lower sides are not centered.
2. The seven-sided bearing bush wears severely on one side; the central bearing bush wears more severely than the two bearing bushes.
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.
3, the back of the bearing bush is corroded or has a slight moving wear scar, the bearing pad positioning table damages the bearing bush and walks irregularly.
The reason is: in order to correct the working space in the device; the double-sided side plane of the bearing bush is cut; the elastic touch force of the bearing bush and the shaft hole is damaged, the bearing cover is reversed; the touch area and the moving gap of the bearing bush and the shaft are changed, and the bearing cover is changed. When the bolts are tightened; they are not tightened according to the rules and torque. If the torque is too large or too small and the bolt tightening torque on the same tile cover is uneven, the bearing bush will be damaged.
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