The automobile engine cylinder to cylinder wall longitudinal mechanical scratches and scratches in the clear range of motion of piston ring, serious wear occurs when melting, caused by fault or extinguish the engine is difficult to start. The cylinder is a major accident of the engine, the fundamental reason is the inner wall of the cylinder and the cylinder piston ring, it is difficult to form oil film between the piston, resulting in poor lubrication, even dry friction phenomenon.
Baotou beiben heavy truck parts of the engine cylinder there are three aspects of the specific reasons:
Reasons for cylinder liner
1 cylinder roundness, cylindricity tolerance exceed the allowable range: the piston and the cylinder seal is greatly reduced, the high temperature gas cylinder down, destroying the oil film between the piston and the cylinder wall, thereby causing scuffing.
2 Baotou beiben heavy truck parts in the assembly process of cylinder liner deformation: for example: the liner surface convex amount is too large, after installing the cylinder head deformation cylinder pressure cylinder; water is too thick, pressed into the body by cylinder are prone to deformation. The cylinder.
Reasons for piston group
1 piston ring gap is too small: if the gap of piston ring, side or back clearance gap is too small, the engine piston ring and cylinder thermal expansion card die wall pressure tight, or piston ring folding die, it is easy to pull on the wall of the cylinder groove.
2 piston pin out: due to the piston pin circlip is not installed or fall off, the piston pin in the movement of the channeling, it is easy to pull the cylinder wall, causing the cylinder to air to the crankcase.
The 3 piston cylinder matching gap is too large or too small: if the piston material bad size error is too large, or the assembly of piston pin piston after deformation, in favor of clearance between the piston and cylinder is too small, the heat expansion after being stuck, and then pull the cylinder wall.
4 piston ring: serious coke too much Coke caused by piston ring bond or killed in bad groove, and the coke is a hard abrasive, grinding will be on the wall of the cylinder longitudinal grooves.
5 piston cylinder: serious partial bending and distortion due to the connecting rod, connecting rod strength, piston pin parallelism and coaxiality deviation is too large, causing the piston cylinder obviously, will accelerate the wear of piston ring, the piston and the cylinder wall, destroy oil film.
Reasons for use
1 air filter: filter sealing effect of variation, sand and dust in the air, inhaled chores in the cylinder, the formation of abrasive wear. Experiments show that if every day in a few grams of dust, wear of cylinder liner will increase by more than 10 times.
2 running bad: the new machine or after overhaul the engine in the steam cylinder, there are many micro rough surface of piston and piston ring parts, lubricating oil film is difficult to form. Teach without running immediately into large load operation, is easy to cause accidents such as scuffing.
3 often cold start: generator start up at a low temperature, oil viscosity, poor mobility, in the inner wall of the cylinder is difficult to form an effective oil film. According to the research department in the test, diesel engine cooling water temperature under 30`c load operation, wear of cylinder parts is 5~7 times of normal temperature.
4 Baotou beiben heavy truck parts generator overheating when cooling system to poor maintenance, or overload operation, machine temperature is too high and not only reduce the mechanical strength of the parts, and the lubricating oil film cylinder wall can not be formed, parts of the piston thermal expansion, easy to get stuck in the cylinder sleeve, the piston is often a consequence partial melting, cylinder wall pulled bad, forcing the engine flameout.
In actual use, the cylinder is often composed of several factors influence results. For example. Without starting the engine cooler immediately after running into the full load operation, it is easy to cylinder accident.