The engine engine connecting rod bolts are used to connect the connecting rod body and the connecting rod cover, and to ensure that they are completely tight under any circumstances without leaving a gap. Connecting rod bolts are mainly affected by the following two aspects:
Withstand the pre-tightening force during assembly, this force is the static load with the same magnitude and direction.
In a four-stroke diesel engine, the connecting rod bolts are subjected to an alternating load of the centrifugal inertial force of the reciprocating motion of the piston rod and the centrifugal force of the connecting rod rotating mass (excluding the connecting rod cover). For example, when the piston is at the upper stop point during the expansion process, the gas pressure is greater than the sum of the inertial force and the centrifugal force of the king's motion, and the connecting rod is compressed. At this time, the effect of the reciprocating inertial force and the centrifugal force on the connecting rod bolt is equal to zero. When the piston is at the upper stop point during the intake process, the reciprocating inertial force and the centrifugal force stretch the connecting rod bolt.
In addition, when the bearing wear gap of the large and small ends of the connecting rod is large, the connecting rod bolt is also subjected to an impact load. Deformation of the large hole of the connecting rod also causes the connecting rod bolt to be bent. Therefore, the force of the connecting rod bolt is complicated.
When the engine is running, if the connecting rod bolt breaks, it will cause a major accident, destroying the crankcase, crankshaft and connecting rod, and even endangering the personal safety of the staff. Therefore, the connecting rod bolt should not only have a proper pre-tightening force to ensure that the connecting rod body and the connecting rod cover are tightly closed, and under high stress conditions, the work should be completely reliable and no fatigue damage occurs.
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