Motion diagram of the assembly structure of the piston connecting rod: press the handle, the dynamic diagram will start.
The working principle of the piston connecting rod: the most basic function of the piston connecting rod is to connect the piston and the crankshaft, and convert the linear piston motion into the rotary motion of the crankshaft. When the engine is turned, the connecting rod will withstand the explosive force generated by the combustion of oil and gas. This explosive force will make the connecting rod have a tendency to distort. The connecting rod is also the component that bears the largest load among all engine components. Because the connecting rod converts the linear motion of the piston into the rotary motion of the crankshaft, the connecting rod will continuously accelerate and decelerate when the piston runs up and down, especially when the piston reaches the top dead center, the direction of the connecting rod will suddenly decelerate from up To stop, and immediately change the direction of movement, this is the most likely to cause damage to the connecting rod.
During the explosion stroke, the high-pressure gas generated by the combustion can become a buffer for the movement of the connecting rod, and the load on the bolts and Bolts will also be reduced. However, during the exhaust stroke, the inertial force caused by the weight of the piston, piston ring, latch and the connecting rod itself will be added to the latch and the Persian. If there is a problem with the connecting rod at this time, then the end is your engine. It is about to enter the factory for overhaul. Most of today's racing engines use forged alloy connecting rods. The quality of the connecting rod is related to the reliability of the engine, but the quality or flaws of the connecting rod cannot be visually inspected. Special non-destructive inspection or X-ray inspection is required. It is the biggest worry when buying and modifying connecting rods.
The requirements for the dimensional precision of the connecting rod will increase with the increase of the compression ratio and the running speed. Even if the dimensional error of only a few thousandths of an inch will cause a significant change in the piston clearance at high speed. If an aluminum alloy connecting rod with insufficient strength is used, the length of the connecting rod will become longer due to inertia at high speeds, causing damage to the engine or an increase in compression ratio. Among the components of the piston connecting rod, the most strict size requirements are the connecting rod bearings (also known as Persian), which is also the most likely component to cause damage to the connecting rod.
Therefore, for racing cars or high-performance engines, the highest quality bearings should be used as much as possible to ensure the reliability of the engine.
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