Damage mode and inspection of crankshaft of MTU diesel generator engine

The crankshaft of diesel generatorengine is commonly damaged by motor shaft damage, cracks, burns, bending or breaking, etc. The following is a detailed introduction to the relevant content.

The damage of surface layer of diesel generator motor shaft is not symmetrical, and the difference of concentricity and cylindricity occurs after damage. The major damage position of the spindle bearing journal and crankshaft motor shaft matches each other, that is, the major damage of the spindle bearing journal is close to the crankshaft motor shaft side, and the major damage of the crankshaft motor shaft is also close to the spindle bearing journal side.

In addition, the motor shaft also has radial conical damage. The ellipse of motor shaft is damaged because the forces acting on the motor shaft are not evenly distributed along the direction of the circle. When the automobile engine is working, the comprehensive interaction force of the crankshaft motor shaft is always in the inside of the crankshaft motor shaft, and the azimuth is outward along the half meridian of the gear, resulting in greater damage to the inside of the crankshaft motor shaft, resulting in ellipse.

Crank shaft of the motor shaft conical damage reason is because the main oil passage to the crankshaft motor shaft is skewed, when diesel generator engine crankshaft, under the effect of centrifugal force, mechanical equipment of lubricating grease residue concentration in the side of the crankshaft motor shaft, make the side of the motor shaft damage acceleration, damaged a cone shaped.

In addition, crankshaft bending, cylinder axis and diesel generator engine crankshaft axis is not vertical and other reasons will make the motor shaft along the radial bearing force is not uniform and damage deflection. The damage of spindle bearing journal is mainly caused by the harm of centripetal force of crankshaft, crankshaft motor shaft and gear arm, so that the relative damage caused by the side of the crankshaft motor shaft and rolling bearing is very large.

The damage of diesel generator engine crankshaft motor shaft can be accurately measured by external diameter micrometer, taking two cross sections on each motor shaft, and two vertical directions on each cross section of diesel generator engine crankshaft. Then calculate the wear rate, concentricity and cylindricity difference of motor shaft.

When the bending degree of diesel generator engine crankshaft exceeds 0.1 mm (some are 0.2 mm), calibration should be carried out. For accurate measurement, the bearing journal of the crankshaft spindle of the diesel generator engine is placed on two contour V-shaped irons on the detection tablet computer. The case of the micrometer is fixed at the "0" part and the circuit breaker touches the surface of the bearing neck of the middle spindle, slowly rotating the crankshaft of the diesel generator engine. Half of the larger range of the micrometer is the bending degree of the crankshaft of the diesel generator engine. During the inspection of distortion, the crankshaft of diesel generator engine shall be placed in the same way as that of bending inspection. During inspection, the gear arm is placed on the level part, and micrometer is used to accurately measure the height-width ratio of the crankshaft motor of the first cylinder and the last cylinder in the same plane plan, and the error is the distortion of the crankshaft of the diesel generator engine.

Jiangsu Meiao Power Technology Co., Ltd. is an important manufacturer of diesel generators. Us ao-generator set manufacturers mainly manufacture and sell diesel generator sets, the power of generator sets is 3-3000KW, mobile station is 24-600KW, Marine emergency diesel generator set 24-800KW, gas generator set, heavy oil generator set and all kinds of imported series, special series (trailer, silent speaker, mobile lighthouse, container, etc.) diesel generator Group at the same time engaged in generator set maintenance and generator set accessories after-sales service.