Short Description of Piston, Crankcase, and Crankshaft

Short Description of Piston, Crankcase, and Crankshaft


Hello readers, welcome to We would like to thank you, those of you who read our blog and visit the site regularly and inspire us to move forward. Today we want to discuss with you all about the motor car Piston, Crankcase, and Crankshaft's short description of that helpful for all.

A piston is at the heart of a reciprocating engine. It consists of a moving cylinder of metal with piston rings to achieve an air-tight seal once it is installed within the engine cylinder. The piston is attached via a piston pin to a connecting rod, which in turn is connected to the crankshaft.

In the next figure, a picture of a piston is given. From there, it is possible to see how the piston enters its entire block in the cylinder and the work of compression in two and homogenization in two is done simultaneously. The work of Daabra ejaculation of six-cylinder blocks was accomplished. The rod by which the pistons are connected is called the connecting rod.

The function of the piston is to create a gas-tight chamber for energy production. As a result of the gas explosion, its expansion takes place on the connecting rod.

Pistons are mainly made of metal -

1. Cast-iron piston;

2. Alloy or mild steel piston;

3. Aluminum alloy piston.

In earlier days, most of the gardens were made of piston cast iron or cast iron. Something has changed nowadays. Nowadays it is mostly made with alloy or mild steel. Aluminum alloy pistons cost more - but they are lighter and stronger.


If the piston and the cylinder are made of the same metal, the gap between the two is very small when heated. However, in two separate metals such as cast iron cylinders, the aluminum alloy expands more in heat - which is not the case in cast iron. Knowing in this regard is beneficial in the work of pitting.


Piston ring: The heat and pressure of the fuel-gas used in the cylinder push the piston outwards. When two pistons are pushed, the pressure of the block arrangement causes the other two pistons to push in again (in the case of 4 cylinder blocks). Thus in cases 6 and 7, when three or four pistons protrude outwards, the others go in.

Now if there is more gap between the piston and the cylinder or it is loose then a rear is attached to the head. The picture below shows three rings. Side views of the three rings are shown.

From the picture, it is understood that the rings are large and medium in size depending on the size of the individual pistons and cylinders. More than one rear is attached to the head of a piston if required.

 Piston rings are made of cast iron or brass. If the cylinder liner is flexible, the piston ring should be made of brass. The piston rivet has to be cut to one side to facilitate insertion into the piston head. The advantage of this is that even if it is slightly stretched for heating, there is no problem. After cutting the piston ring according to the fence of the cylinder, it is also necessary to cut off a small part. Nowadays, he is usually fitted with three pistons, one in the middle of the head and one in the bottom.

To make the piston and cylinder work much easier, it is necessary to use lubricating oil in it.


Gas ring or pin: The gauze pin pierces the body of the piston and is attached to the piston. To hold this pin, two bosses are welded together on both sides of the piston. This pin can be attached to the piston in various ways. Here are some of the methods.

1. The boss is fastened with small bolts.

2. The steel wires on both sides are fastened with rings. Then he was called Gajan Ring.

3. It is pasted with the help of a circlip.

4. The pin can also be melted and attached to its two ends with the help of brass washers.

If this pin comes out for any reason, it will cause scratches or stains on the cylinder - so precautionary measures are required. If there is a scratch or stain on the cylinder, gas leaks through it - the gas is not tight. In this case, the cylinder needs to be re-bored.

The goose pin is hollowed out - resulting in less weight. This pin connects to the connecting rod like a hinge and creates motion. These pins are made by mixing expensive carbon with steel or nickel with steel. This pin is made. This pin decays and makes squeaking noise while the engine is running. Then the PIN needs to be changed.

Crankcase: A crankcase is the housing for the crankshaft in a reciprocating internal combustion engine. The enclosure forms the largest cavity in the engine and is located below the cylinder(s), which is a multicylinder engine is usually integrated into one or several cylinder blocks.

The crankcase is on the opposite side of the piston. This crankcase contains lubricating oil. With the help of a pump, the oil spreads to different moving parts of the engine.

In many vehicles, the upper part of the crankcase is welded together with the cylinder block. Its lower part is made of cast iron or steel sheet. These two parts are connected by nut-bolts.

In most of the engines in our country, the crankcase is made with a separate aluminum alloy. The crankcase usually does not have to withstand too much friction, it stays on the block for a long time, and does not wear out. If the crankcase is welded with the cylinder block, it is always necessary to use a liner inside the cylinder. As a result, the original cylinder does not decay and the cylinder with crankcase is loaded.


Conning rod: The connecting rod connects the crankpin at the hinge speed with the adjacent gauge pin of the piston. This causes the piston to transmit the speed of travel in a straight line to the crankshaft in the form of rotational motion.

The connecting rod has a bearing at the end of the crank pin. He is called Big End Bearing. It is usually added with two nut bolts.

Connecting rods are usually made of nickel and steel alloys or aluminum alloys.

This rod has to withstand enough pressure. The result is that it needs to be made of fairly strong metal so that it does not bend easily; Nowadays in many engines, the connecting rod is made of aluminum alloy. One rod is required for each cylinder and piston. A bronze bush is fitted inside the small end towards the piston pin. Holes are drilled at the top and bottom of the connecting rod to provide lubricating oil. 

Crankshaft: A crankshaft is a rotating shaft which (in conjunction with the connecting rods) converts the reciprocating motion of the pistons into rotational motion. Crankshafts are commonly used in internal combustion engines and consist of a series of cranks and crankpins to which the connecting rods are attached.

The function of the crankshaft and the connecting rod is to convert the simple motion of the piston inside the cylinder to cyclic motion. So crankshafts and connecting rods need to be made of very strong metals. This is because it has to withstand the pressure and heat of the exploding gas.

Depending on the number of cylinders in the cylinder block, these crankshafts have different shapes and sizes. It looks like a sack that encloses with a drawstring.

The larger the number of cylinders, the more pressure will be applied to the crankshaft. When there are more cylinders, the work of the crankshaft increases easily and the pressure decreases, and the shaft also becomes longer.

The head of the three-pronged crankshaft-1,4,6,8-crankshaft rises; The head of the crankshaft is descending. Just as the cylinder and the piston are the two main starting devices of the engine, so the crankshaft is the main engine of the engine. When making the crankshaft, the iron is heated by intense heat, making it like steel. He was beaten with a heavy hammer. The crankshaft is made by plane and milling and turning much solid steel. From this, it is understood how hard and strong the crankshaft is made and how much pressure it has to withstand.


The connecting rod is connected to the crankshaft by bearings. Again the crankshaft is connected on both sides by two providing bearings. There are as many connecting rods as there are connecting rods - but there are two main or main bearings. The part of the crankshaft that rotates between the bearings is called the journal. In many cases, the main bearing is not one but two, two on each side, a total of four. This needs to be done if there are more cylinders.

Most of the bugs were made of hard steel at the front. Nowadays, however, it is often made by mixing three percent nickel with steel. Again chromium and nickel are bonded together with steel. Thank you all for reading this article. We ( team) are grateful for the time you have given valuable feedback about the article.

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