The crankshaft is the main rotating parts of the engine, and after the connecting rod, the upper and lower (reciprocating) movement of the connecting rod can be turned into a cyclic (rotational) movement.
Crankshaft is an important part of the engine, the material is made of carbon structural steel or ductile iron, there are two important parts: spindle neck, connecting rod neck, (and others). The spindle neck is mounted on the cylinder body, the connecting rod neck is connected with the connecting rod hole, and the connecting rod head hole is connected with the cylinder piston, Crankshaft which is a typical crank-slider mechanism. The lubrication of the crankshaft mainly refers to the lubrication of the bearing between the rocker arm and the two fixed points. Crankshaft rotation is the engine power source. is also the source power of the entire mechanical system.
The crankshaft is the reciprocating movement of the piston into a rotating part, generally in the cylinder liner under the crankcase, inside is the oil lubrication, now in addition to Mazda’s rotor engine, the engine must have crankshaft. The crankshaft also transmits the energy of the car piston to the flywheel. The crankshaft of the general automobile is connected with the clutch directly. The clutch then transfers power to the transmission. Crankshaft The general straight-row engine crankshaft each one of the crank corresponding to a piston cylinder, the V-type engine is a flexure corresponding to the two piston cylinders. Crankshaft It has high requirements for materials, processing methods, methods and precision.
In order to reduce the crankshaft quality and the centrifugal force produced by the motion, the crankshaft axle neck is often made hollow. An oil hole is opened on the surface of each axle neck so that the oil is introduced or led to lubricate the surface of the axle neck. In order to reduce the stress concentration, the connection between the spindle neck, the crank pin and the crank arm is connected with the transition arc.
The function of the crankshaft balance weight (also called counterweight) is to balance the rotational centrifugal force and its torque, and sometimes to balance the reciprocating inertial force and its torque. Crankshaft When these forces and torques themselves are balanced, the balance weight can also be used to reduce the load of the main bearing. The number, size and position of the balance weight should be considered according to the number of cylinders, the arrangement of cylinders and the shape of crankshaft. CThe balance weight is generally with the crankshaft casting or forging into one, the high power diesel engine balance weight and crankshaft are manufactured separately, Crankshaft then the bolt is connected together.
The composition of the crankshaft
The material is made of carbon structural steel or ductile iron, and has two important parts: the spindle neck, the connecting Rod Neck, (and others). The spindle neck is mounted on the cylinder body, the connecting rod neck is connected with the connecting rod hole, Crankshaft and the connecting rod head hole is connected with the cylinder piston, which is a typical crank-slider mechanism. The lubrication of the crankshaft mainly refers to the lubrication of the bearing between the rocker arm and the lubrication of the two fixed points. The crankshaft rotation is the engine power source. is also the source power of the entire mechanical system.
Crankshaft will be due to the oil is not clean and the stress of the axle neck caused by uneven contact between the connecting rod head and the shaft neck wear, if the oil has large particles of hard impurities, there are also scratches on the surface of the shaft of the danger. If the wear is serious, Crankshaft it is likely to affect the piston up and down movement of the stroke length, reduce the combustion efficiency, natural also will be smaller power output.
In addition, the crankshaft may be due to insufficient lubrication or oil too dilute, resulting in the surface of the shaft burns, serious cases will affect the reciprocating movement of the piston. Crankshaft Therefore must use the suitable viscosity lubricant, and must guarantee the engine oil cleanliness.
The crankshaft front end is fitted with a timing gear, a pulley for driving a fan and a pump, and a starter claw. In order to prevent the oil from leaking along the crankshaft axle neck, Crankshaft an oil-dumping pan is arranged on the front of the crankshaft, and a seal is arranged on the gear chamber lid. The rear end of the crankshaft is used to install a flywheel, which is formed between the rear axle neck and the flywheel flange to prevent the oil from leaking backwards.
The shape of the crankshaft and the relative position of the flexure (that is, the arrangement of the flexure) depend on the number of cylinders, the arrangement of cylinders and the generator of the engine.
