How does a Crankshaft work?

The crankshaft is used where energy and forces are converted into rotary motion. It uses a connecting rod to change the movement of the piston into the rotational motion that drives the engine. This shaft uses in various engines, from wheel chains and engines to marine diesel engines.

Working of Crankshaft

The function of the crankshaft is to provide a smoother ride for the large multi-cylinder engine. The linear movement of the piston is transformed into a rotary movement. When a mixture of air and fuel burns, energy is generated, this force is converted into rotational motion of the shaft. The linear movement of the piston is converted into torque by connecting the shaft. And then put it behind the wheel. There are holes in the crankshaft to supply engine oil. This oil can be transferred without problems. The opposite weight helps regulate the weight of the frame and shaft.

Photoelastic Stress Analysis of Crankpin Fillets of a Crankshaft |  SpringerLink

The crankshaft also plays a role in carrying the load because a certain load takes time in this process. One of the times is extreme flexion and high pressure. As the rotation of the crankshaft continues to increase and slow down, additional vibrational loads are added. Bearings are also subject to high wear.

Parts of Crankshaft

Following are the major components of the crankshaft:

  1. Crankpin
  2. Main journals
  3. Crank web
  4. Counterweights
  5. Thrust washers
  6. Oil passage and oil seals
  7. Flywheel mounting flange

1. Crank Pin

This allows you to attach the rod to the crankshaft securely. The shaft journal surface is cylindrical to create a rotational force at the large end of the connecting rod. They are also called connecting rod loaders.

2. Main journal

The register is connected to the engine block. These bearings secure the shaft and rotate it on the engine block. Such bearings are, for example, plain bearings or journal bearings. The main bearings are different in each motor and generally depend on the power supplied by the motor.

3. Crank web

The crank web is the most important part of the crankshaft. The crank web connects the crankshaft to the main bearing journals.

4. Counterweights

The counterweight is the weight applied to opposing forces to create balance and stability in the shaft. They are mounted on the crankshaft arm.

it is very useful for achieving higher speeds and smooth engine operation.

5. Thrust washers

In some cases, two or more thrust washers are provided to prevent longitudinal movement of the crankshaft. These thrust washers are made between the wire and the machine on the crankshaft saddle.

With the help of the thrust washers, you can easily maintain the distance and reduce the lateral movement of the crankshaft. It is made as part of the main bearing in many machines, and older types usually use separate washers.

6. Oil passage and oil seals

The oil passage transfers the oil from the main bearing warehouse to the final department store. The crankshaft arm is usually perforated. When the shaft pin is in the up position, and the combustion force pushes the connecting shaft into the down position, it allows oil to enter between the journal and bearing.

It has several extensions beyond the shaft on both sides. This can cause oil leaks at this end.

Front oil seal: they are very similar to the rear oil seal. However, its drawback is that it is non-destructive and easier to access. The front oil seal is located on the rear pulley and timer gear.

Rear oil seal: found in the original charger and in the carousel. It was pushed into the hole between the engine block and the oil tank. The oil seal consists of lips fixed to the crankshaft by a spring called a sock spring.

Application of Crankshaft 

  1. The crankshaft is commonly used in machines to convert reaction motion into circular motion, making it easier to use energy or force.
  2. It is actually the heart of the internal combustion engine. The shaft is responsible for the normal operation of the engine. In some cases, it can save energy by moving the piston for pressure, intake and outlet shocks.
  3. The crankshafts are used in different types of pumps for rotating the piston. 

 Common Crankshaft faults

Crankshaft problems are very rare and only appear when the engine is in serious condition. Engine parts are reliable and stable, but some common mistakes include:

  • Pin-centered wear – due to insufficient oil pressure. The crankshaft loader is in contact with the bearing surface. This slowly widens the gap and worsens the oil pressure.
  • If you’re not careful, a worn belt can cause serious engine problems. This can damage the bearings and cause a lot of damage to the engine.
  • Fatigue: When the constant force on a shaft causes a fracture. This problem usually occurs in the rounded corners of the junction of the magazine and the web.

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