A flywheel is used to even out impulse, and to store energy these are both the same thing in reality An engine, especially when running slowly such as when starting has relatively large impulses from each cylinder firing, but without a flywheel there is very little to keep the crankshaft turning once the sparkplug had fitted and expanded the mixture in a cylinder. Improve this answer. Rory Alsop Rory Alsop I was under the impression the purpose of the flywheel was to assist the starter pinion gear to start your motor: So every time you turn your vehicle the starter motor would rotate the gear which would rotate the engine.
Can the downvote be explained please? This is certainly a purpose of the flywheel. I've never thought of what else it does, but now that the OP asks, I guess there must be another purpose. Before this question, "big starter gear" was my answer. The downvote was actually mine - I was going to come back and comment.
The flywheel itself doesn't have to be connected to the starter motor cog, and on various cars it isn't, so while in some cars they have decided to put teeth on the outside of the flywheel to make it part of the starter transmission, that is not what it is for.
AFAIK the fact that the flywheel is toothed and used to turn the engine for starting was merely a convenience. The primary purpose of the flywheel is to even out the bursty nature of the power strokes into something smooth and keep the crank turning between power strokes. Although the smoothness of the engine turnover may be slightly compromised as a result of the reduced mass, the sharp revving characteristics make this weight reduction a common theme in cars modified for motorsport.
Another type is a dual-mass flywheel which goes the opposite way to the lightened option by bringing a secondary lump of material into the fray. While an engine is reciprocating, the cycles create large amounts of unwanted vibration that can disturb the function of other components down the line.
These vibrations differ in frequency depending on the amount of cylinders at hand and their orientation. For example, the engine balancing involved within a straight-six makes for very little adverse vibrations as the primary and secondary forces created within the engine cancel each other out.
On the other hand, single and twin-cylinder engines create a large amount of vibrations due to an inherent lack of balance. The resulting vibrations make their way down the crankshaft to the transmission and can disturb shifting and the general operation of the gearbox.
A dual-mass flywheel does its best to combat these vibrations by damping their effect through two masses and a combination of springs. One mass is connected to the crankshaft and the other to the transmission. The primary mass forms a large disc that rotates with the crankshaft and the secondary mass is a smaller disc that sits within it.
Springs physically connect the two masses, so as the primary mass spins, the secondary mass is influenced by the springs to also rotate. Weight Loss. Sunny News. Fitness Programs.
Getting Started. New Year New You. Summer Tone Up. At Home. Healthy Eating Strategies. Fitness Nutrition. Purchasing Guides. Product Comparisons. How To Use. How to Assemble. Maintenance Tips. A great amount of kinetic energy is preserved when the flywheel rotates. This energy is later used to power up the vehicle when starting the engine or speeding. Due to the toughness requirement of a flywheel, it is typically made of steel that rotates on conventional bearings.
High energy density flywheels are made of carbon fibre composites and use magnetic bearings. Such flywheel revolves at speed up to 60, RPM 1 kHz.
Flywheels can be found in almost all type of automobile as they serve a variety of purposes will be discussed here. Below are the functions of the flywheel in an automobile engine:. Engine Balancing: because the pistons are offset from the centre of the crankshaft vibration and wobbles occur. This is also because of each piston fires at a different angle. The function of a flywheel in this situation is to suppress the side-to-side motion. This is achieved because of the heavyweight of the flywheel.
Flywheels reduce the vibration of the engine as a whole as the engine is stabilized and balance on the mounts. Engine Start: the flywheel plays another role while starting the engine. The gear teeth on the flywheel are attached to a starter motor. This starter motor is controlled with the car key so when the car is started the starter motor turns the flywheel. Immediately the engine spins, the combustion effect continues turning the engine.
The Bendix gear in the started motor withdraws in order for the flywheel to freely spin. Flywheel also limits the wear between the transmission shaft and the driveshaft. This two are attached with a universal joint.
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