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"Results and Cause Analysis" for damage to shafts and bushings
Source: China Bearing Network Time: 2014-02-05
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The damage of the water in the smooth oil to the shaft and the bearing bush is severe; the water will make the smooth oil damper damage the oil film. The outer surface of the alloy layer of the bearing bush has a hole-like gray material at the margin of the conflict surface; and it forms a black corrosion on the alloy surface. The outer surface of the bearing alloy conflicts with irregular pits and partial flakes.
2. Damage to the shaft and bearing bush caused by fuel in the smooth oil:
After the fuel enters the crankcase, it will make the smooth oil change. æ¹ã‘浔〗 The legs are å€ å€ å€ å²· å²· å²· 嵬咴 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . By-products that occur after fuel incineration; after being brought into the poorly ventilated crankcase by the fuel; the sulfuric acid produced will form a severe cavitation on the outer surface of the shaft.
The reason for the occurrence: the fuel supply of the fuel system is too large; the fuel injected into the incineration chamber cannot be completely incinerated, the intake air is blocked by the intake air; the fuel cannot be incinerated, the nozzle seal fails, the fuel enters the crankcase, and the fuel passage in the cylinder head There are blowholes or cracks in the pores, and the idling speed is too long; the temperature of the initiator is low and the fuel cannot be completely burned.
3. Damage and damage appearance caused by poor smooth action:
When the smoothing effect of the shaft and the bearing bush does not meet the demand; there will be various fault characteristics. For example, the oil pressure is low; the part between the shaft and the bearing bush will cause damage and damage to the sports appearance due to the dry conflict of the direct touch; At the moment, the outer surface of the shaft is blue. If the smooth oil fails or the pressure cannot be built up; the appearance of the movement completely loses the protection of the oil film; the straight touch touches the dry conflict. The temperature rises the alloy layer of the bearing shell to melt; The appearance of "wa"; not stopping in time will constitute more severe damage to the parts.
The reason for the occurrence is: the oil level is too low or the smooth oil passage breaks, the oil suction filter, the oil passage, the oil hole are blocked, the oil pump wears or the oil suction line leaks, the pressure regulating valve and the pressure limiting valve are damaged, and the starter idles If the time is too long, the high-speed operation and full-load operation will be directly performed without the warming operation after the start-up of the start-up machine. After the full-load operation, if the temperature is high, it will stop without the empty load and low-speed operation; Heat buildup; temperature rise, no standard oil is selected according to the rules and the oil is replaced regularly.
It is necessary to avoid damage and damage to the shaft and bearing bush caused by the smooth system:
.1) It is necessary to protect, view, and replace the smoothing oil and filter element at the time of the rule.
.2), avoid the start of the idle speed of the machine is too long; idle work can not exceed 5 minutes.
.3) It is necessary to pass the medium-speed heating operation after the initiator is initiated; when the water temperature rises above 70 °C, it is put into operation.
.4) After the initial registration of the initiator, the initial launch will also be initiated after the launch of the engine stock;
.5) After the starter has completed the full-load operation for a long time; it cannot be stopped immediately; it is necessary to let the initiator idle for 15 minutes after the idle speed is turned on; otherwise the internal heat will not be dissipated.
.6), the smooth oil level of the initiator; it is necessary to be within the scope of the specification; it is necessary to sanitize the smooth oil and refueling; avoid the entry of any dirt and water; together to ensure the sealing effect of the various parts of the machine.
.7), in the absence of manual smoothing equipment; when the device is started, the outer surface of the shaft and the bearing bush shall be coated with the same sanitary smoothing oil as the operating label; after the device is started; the fuel switch is closed before the initial launch; The initiator machine starts the machine to idle several times; when the engine oil pressure gauge is displayed; then the fuel switch is turned on; the throttle is set at the medium and low speed; the initiator is initiated to conduct the operation investigation.
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