What is a car flywheel?
The flywheel is a cast iron inertia disk with a large mass. It stores energy, supplies the needs of the non-power stroke, and drives the entire chain. The rod structure crosses the top and bottom dead centers to ensure the uniformity of the inertial rotation of the engine crankshaft and the uniformity of the output torque. With the help of the inertial force of its own rotation, it helps overcome the compression resistance in the cylinder during starting and maintain the engine’s stability during short-term overload. Keep running. The flywheel of a multi-cylinder engine should be dynamically balanced together with the crankshaft, otherwise the centrifugal force generated due to mass imbalance during rotation will cause engine vibration and accelerate the wear of the main bearing. In order not to destroy their balanced state during disassembly and assembly, the flywheel and crankshaft should have a strict relative position, which is guaranteed by positioning pins or asymmetrically arranged bolts. Common damage parts of the flywheel are ring gear abrasion damage, end face ablation, deflection deformation and flywheel screw hole damage. The flywheel assembly is an important component of the engine. It operates hundreds of revolutions per minute, which shows its importance.
The function of the car flywheel
The flywheel has two main functions: one is for the engine Store energy and use the stored energy to make the engine complete the non-power stroke; second, make the torque and speed output by the engine to the outside world as uniform as possible.
At the power output end of the crankshaft, that is, the side connected to the gearbox and the power equipment. The main function of the flywheel is to store energy and inertia outside the engine’s power stroke. A four-stroke engine only performs work in one stroke. The energy of intake, compression, and exhaust comes from the energy stored in the flywheel. If the balance is wrong, correct it. The balance of the engine mainly relies on removing the balance weight on the shaft. Single-cylinder engines have a special balance shaft.
The flywheel has a large moment of inertia. Since the work done by each cylinder of the engine is discontinuous, the engine speed also changes. When the engine speed increases, the kinetic energy of the flywheel increases and the energy is stored;When the engine speed decreases, the kinetic energy of the flywheel decreases and the energy is released. Flywheels can be used to reduce speed fluctuations during engine operation.
It is installed at the rear end of the engine crankshaft and has rotational inertia. Its function is to store the engine energy, overcome the resistance of other components, and make the crankshaft rotate evenly; The engine and the vehicle transmission are connected through a clutch installed on the flywheel;Engage with the starter to facilitate engine starting. And it is the integration point of crankshaft position sensing and vehicle speed sensing.
In addition to the external output, part of the energy transmitted by the engine to the crankshaft during the power stroke is absorbed by the flywheel, so that the crankshaft speed does not increase much. In the three strokes of exhaust, intake and compression, the flywheel releases its stored energy to compensate for the work consumed in these three strokes, so that the crankshaft speed does not decrease too much.
In addition, the flywheel also has the following functions: the flywheel is the active part of the friction clutch; the flywheel rim is inlaid with a flywheel ring gear for starting the engine; the flywheel is also engraved with Dead center mark, used to calibrate ignition timing or injection timing, and adjust valve clearance.
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