A connection rod to break the block includes excessive mechanical stress, insufficient lubrication, fatigue and wear and others.
There are many reasons for connecting rod fracture, mainly related to mechanical stress inside the engine, insufficient lubrication, fatigue and external factors. The following is a detailed analysis of the possible causes of connecting rod fracture:
1. connection rod to break the block: Excessive mechanical stress
The connecting rod is subjected to huge compressive and tensile forces during engine operation. Especially when the piston moves up and down, the stress is subjected to increases cubically with the increase in engine speed.
This high stress can cause fatigue fracture of the connecting rod, especially when the material strength is insufficient or the design is flawed.
2. connection rod to break the block: Insufficient lubrication
Insufficient lubrication is one of the main causes of connecting rod fracture. When the connecting rod bearing lacks sufficient oil lubrication, the direct contact between the metal parts can cause overheating, which can cause fatigue or fracture. In addition, if the wear of the piston pin hole or connecting rod journal prevents the lubricant from entering effectively, the risk of fracture will also increase.
3. connection rod to break the block: Fatigue and wear
After long-term use, the connecting rod will gradually crack due to fatigue. These cracks usually start from stress concentration areas of the connecting rod, such as near the lubrication channel or processing defects. In addition, material fatigue of the connecting rod can also cause it to break under high loads.
4. Excessive overspeeding
Overspeeding the engine can significantly increase the stress on the connecting rod, making it more susceptible to fracture. For example, when the engine speed exceeds the design limit, the mechanical load on the connecting rod increases sharply, causing fracture.
5. Hydrolock
If coolant or other liquids enter the cylinder, the connecting rod will not work properly due to hydrolock. In this case, the connecting rod may break due to mechanical obstruction.
6. External factors
External factors, such as loose connecting rod bolts, incorrect installation or damage, can also cause connecting rod fracture. For example, loose or broken connecting rod bolts can directly cause connecting rod failure.
7. Material defects
Defects in the connecting rod material, such as improper processing, rough surface or internal stress concentration, can also cause it to break. For example, some connecting rods may produce microcracks during the manufacturing process due to processing problems. These cracks will expand under long-term use and eventually lead to fracture.
8. Other mechanical failures
Other common connecting rod failures include piston pin sticking, piston ring wear, or excessive clearance between the piston and cylinder wall. It may cause the connecting rod to be subjected to additional mechanical stress and thus break.
The causes of connecting rod fracture can attribute to a variety of factors. Including mechanical stress, insufficient lubrication, fatigue, material defects, external factors, and engine overspeed. In order to prevent connecting rod fracture, the engine lubrication system should check regularly. The connecting rod bolts should tighten the engine overspeed should avoid. And worn or damaged parts should replace in time. In addition, the selection of high-quality connecting rod materials and processing technology is also an important measure to reduce the risk of fracture.
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