In addition to the oil wedge pressure generated by the uniform speed load, the actual oil film pressure in the bearing also bears the pressing force generated by the circumferential and radial displacement during the rotation of the crankshaft. Therefore, when the rotation speed is fixed, the axial position of the crankshaft is The film pressure is a function of the angle of rotation of the crankshaft, forming a pulsed load, bending deformation of the bearing and bearing seat and even bending vibration.

The main reason for rolling tile 16v28. Diesel engine shim and diesel engine body, crankshaft, bearing repair, assembly, manufacturing quality, but also with the actual operation of the driver operating, maintenance, lubrication conditions, based on recent years 16V28.

From the analysis of the status of rolling mills in diesel engines, there are several reasons for the occurrence of rolling mills: (1) The coaxiality of main bearing holes is very poor. Due to the poor coaxiality of the main bearing bores, the journals are in local contact with the bearing pads, causing the load to concentrate on one side of the bearing pads causing the tiles.

On the 7th locomotive of DF. No. 7 due to the poor coaxiality of the main bearing hole, three times the fifth major bearing bush was severely tiled, disassembled and the crankshaft was measured. It was found that the jerkiness of the jerk was inconsistent with the requirements of the overhauled car. New car requirements. According to the analysis of the coaxial data of the engine, the coaxiality of the fifth main bearing of the diesel engine is the largest, and the rolling bearing may be carried by the main bearing of the fifth gear of the dry machine body, and the coaxiality of the fifth main bearing is the largest. The fifth position beats the most, so that the main bearing bears more capacity than the oil wedge, causing dry friction, and then rolling. DFI:075 Locomotive No. 252 diesel engine found that the body's coaxiality was exceedingly poor during the assembly of the engine. The approval process was carried out. Although no tile was generated during the factory, it was not delivered within 3 months after the factory was put into operation. Spindle tile shingles took place and the factory was repaired.

(2) The oil pressure is too low. When the locomotive lubricating oil is under low pressure for a long time, it will inevitably cause the diesel engine to tile, and DFS. will produce the l-cylinder connecting rod due to the low oil pressure, the 9-cylinder connecting rod edge and the crankshaft connecting rod neck between the I and 9 cylinders. Injury, after properly grinding the first connecting rod neck of the crankshaft, measuring its size, it was found that the first half of the connecting rod neck was seriously out of tolerance, and the second half was slightly worn, resulting in excessive wear of the cylinder cylinder connecting rod, resulting in a piston head Touching the bottom plane of the cylinder head causes a knock on the cylinder and the connecting rod and the crankshaft rotate, causing serious wear of the crankshaft.

(3) The cleanliness of the vehicle lubricating oil system is poor. The Fll locomotive lubrication system involves a wide range of processes and requires strict control of various processes. In recent years, DFI has occurred. Three locomotives 0146, 0145, and 014 have not been cleaned by impurities during the assembly of the coarse filter. The main oil gallery of the diesel engine caused the connecting rod and main bearing tile to be damaged.

(4) The quality of the bearing shell itself. The thickness of the alloy layer of the bearing bush is too large or the thickness is not uniform, resulting in local exposed steel on the surface of the alloy. The alloy and the steel back are poorly bonded, and the alloy layer and the back of the steel alloy are partially slipped after the bearing is carried, and thus the peeling causes the grinding tile. Occurs frequently on DF; locomotives. Diesel engine No. 2495 had a poor combination of bearing steel back and alloy layer. It was stopped at the diesel engine test station until 17-19, and the third spindle bearing tile was found.

(5) In the cold winter, the locomotive warming work did not strictly enforce the technical requirements, did not preheat the diesel engine to start the specified oil and water temperature, started at a low oil temperature, the viscosity of the oil was large, and the flowability was poor. The oil did not reach each of the frictional parts, resulting in an instantaneous lack of oil in individual parts. The diesel engine turned and dry friction occurred in individual parts.

Sharp rise in temperature and heat, resulting in tile shingling, and ultimately expanded to the entire bearing shingles, over time, wear to the steel back Jiang Chong, diesel locomotive No. 250 diesel engine will therefore produce the fifth gear spindle bearing tile.

Lapping treatment (1) When a small amount of alloy debris on oil sump oil is found on the oil sump, it may be caused by connecting rods or by grinding, and then the observation and analysis of the corresponding part of the cylinder head and the dismantling of connecting rods shall be performed. In case of minor strains, grind the connecting rods with oilstone. If the strain is serious, replace the connecting rods, grind the surface of the crankshaft with oilstone, and then go to the diesel engine test station to test. (2) When there is a large amount of alloy debris on the oil sump, it is judged to be caused by the main bearing shingles. At this time, the diesel engine must be lifted to return to the assembly station for dismantling, and the data must be re-measured, reassembled with tiles, and strictly in accordance with the regulations. operating. (3) For the current situation of the poor bonding force between the bearing alloy and the steel back, adopt corresponding detection methods, such as ultrasonic thickness measurement and ultrasonic testing; try to make the binding test of the alloy and steel back to the central laboratory to meet the requirements, and Conduct irregular inspections.

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