What is the function of the automobile crankshaft
The main function of the automobile crankshaft is to convert the thrust force from the piston connecting rod into the rotating torque force, so as to drive the automobile transmission system and the engine valve mechanism and other auxiliary devices . Crankshaft is one of the most typical and important parts in the engine, its function is to convert the gas pressure transmitted by the piston connecting rod into torque, and do work as a power output to drive other working mechanisms.
How the crankshaft works
The crankshaft realizes energy conversion and transfer by converting the reciprocating linear motion of the piston into circular rotating motion. It is subjected to complex alternating loads, including the role of periodic changes in aerodynamic force, inertial force and moment, so the crankshaft is required to have sufficient fatigue strength and stiffness against bending and torsion.
Structure and material of crankshaft
Crankshafts are usually made of high-strength alloy steel with high tensile strength and good toughness. Its structure includes the main shaft neck, connecting rod neck and other parts, which are designed and materials selected to ensure that the crankshaft can withstand huge forces and torque at high speeds, while maintaining stable rotation.
Crankshaft maintenance and common problems
The crankshaft may bend and twist during use for various reasons, which will affect its normal work. In order to ensure the normal operation of the crankshaft, regular inspection and maintenance are required, including checking the wear, balance and clearance of the crankshaft. Common maintenance problems include crankshaft bending and torsion, which can lead to reduced engine performance or failure.
Automobile crankshaft broken can take the following repair and replacement methods :
Repair method :
Grinding : For minor wear, a layer of metal can be removed from the crankshaft surface by grinding to restore its size and shape. This requires high-precision equipment and professional technicians to operate .
welding : If there is a crack in the crankshaft, it can be repaired by welding. However, the welding process requires strict control of temperature and process to prevent deformation and residual stress. Heat treatment and flaw detection are also required after welding .
calibration : For bent crankshafts, a press can be used to correct them. The correction process requires the precise measurement of the degree and position of the bend, and the gradual application of pressure until the straight state is restored. After correction, flaw detection and dynamic balance detection are required .
Change method :
Select the right crankshaft : Select the right crankshaft for replacement according to the model and engine type of the vehicle. Ensure that the material, size and performance of the new crankshaft match the original .
professional installation : Replacing the crankshaft requires professional technology and equipment. During the installation process, pay attention to the balance of the crankshaft, matching clearance and pre-tightening force of the fixed bolts .
inspection and verification : After replacement, a comprehensive inspection shall be carried out, including flaw detection and dynamic balance, to ensure that the crankshaft can work normally and does not affect the engine performance .
Preventive measures :
Regular maintenance : replace the oil and oil filter in time to ensure the normal work of the lubrication system and avoid dry friction and wear .
check and maintenance : check the crankshaft status regularly, including the matching gap between the journal and the bearing shell, the bending and distortion of the crankshaft .
avoid overload : avoid long-term overload operation of the engine, reduce the damage caused by overheating and mechanical stress .
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