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5 crankshaft main journal, connecting rod journal shape dimension is out of the crankshaft main journal, connecting rod journal or cylinder main bearing hole, connecting rod big hole cylindricity or taper difference; both will make the journal and bearing bush gap intermittent (continuous) or tapered. It is not guaranteed to form a good smooth oil film. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
After the new machine or overhaul, the diesel engine is not put into operation for a long time; it is easy to attack the above-mentioned appearance; the journal scale can be measured. If the journal is ablated, the adjacent journal can be measured (the adjacent corresponding journal is used according to the convention) Use the same equipment, the same cutting tool processing; then it can represent the shape error of the ablation journal).
6 The crankshaft main journal and the connecting rod journal have poor surface roughness due to poor roughness; there are many metal peaks on the outer surface of the journal; it destroys the integrity and continuity of the smooth oil film between the journal and the bearing bush. The peak directly conflicts with the bearing bush; it constitutes crankshaft ablation.
Frequent attacks occur after the new machine or overhaul. The diesel engine is not put into operation for a long time. If the measured journal is ablated, the roughness detector can be used to measure the adjacent corresponding journal (since the case is; the adjacent equipment is selected by the same equipment, The same cutting tool is processed; then the measured roughness can represent its ablation journal roughness).
7 crankshaft, flywheel, clutch dynamic balance, ultra-difference dynamic balance, super-difference; crankshaft high-speed rotation, inertial force; the crankshaft journal and bearing bush cooperation gap will be damaged; severely, the journal and the bearing bush directly collide to form crankshaft ablation .
The problem usually occurs when the machine travels for 10,000km. After the crankshaft is ablated, the residual debris on the journal can be removed; the balance is checked from the head; the unbalance can basically indicate the ablation of the axicon.
8 Protection and protection If the diesel engine is not operated for a period of time, if it is not properly protected and protected in time, the components such as the oil pump pressure limiting valve will be worn and deformed. The oil filter element will be blocked by oil and sludge; Falling; causing crankshaft ablation.
Crankshaft ablation; mainly due to the failure of the crankshaft journal and the bearing bush to form a useful smooth oil film; the crankshaft journal directly conflicts with the bearing bush. When the diesel engine attacks the crankshaft ablation; it will emit white smoke; announce metal impact abnormal sound Sound; even the crankshaft and the bearing bush are locked together and cannot be changed. Therefore, it is necessary to correctly analyze and discriminate the cause of the attack.
1The quality of the oil is poor 1) The quality of the oil is low. The quality grade and viscosity grade of the selected oil are lower; or the different trademark oils are used for blending; the performance of the oil is not up to the demand, and a lot of dust is mixed in the oil application process. And because the working temperature of the diesel engine is too high, the oil is oxidized and transformed. The oil of oxidized bismuth is black and dull; the concentration is increased; the oil is rubbed with two fingers; the oil is found to have dust, impurities, etc. If the oil used is found to have the above appearance It is necessary to replace it in time.
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Analysis and Discrimination of the Causes of Crankshaft Ablation (2)
Source: China Bearing Network Time: 2014-05-23