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Detailed explanation of the engine – crank connecting rod mechanism

Today, Landtopmall will introduce the crank connecting rod mechanism.
The function of the crank connecting rod mechanism is to convert the reciprocating motion of the piston into the rotational motion of the crankshaft and at the same time convert the force acting on the piston into the torque output by the crankshaft to drive the wheels of the car to rotate.

Landtopmall is a store that integrates various engine parts such as excavators and diesel engines. There are many high-quality parts in our store.

crank connecting rod

1. Composition of crank connecting rod

The crank connecting rod mechanism is composed of three parts: the body group, the piston connecting rod group and the crankshaft flywheel group.
Block group: cylinder block, cylinder head gasket, cylinder head, crankcase, cylinder liner and oil pan;
Piston connecting rod group: piston, piston ring, piston pin, connecting rod;
Crankshaft flywheel set: crankshaft, flywheel, torsional damper, balance shaft.

1. Body group

The body is the skeleton that constitutes the engine, and is the installation base of the various mechanisms and systems of the engine. All the main parts and accessories of the engine are installed inside and outside it, and bear various loads. Therefore, the body must have sufficient strength and rigidity.

2. Piston connecting rod group

The function of the piston is to form the combustion chamber together with the cylinder head and the cylinder wall, and bear the gas pressure in the cylinder, and transmit the force to the connecting rod through the piston pin to push the crankshaft to rotate.

The piston ring is installed in the piston ring groove to seal the gap between the piston and the cylinder wall, preventing blow-by and making the reciprocating motion of the piston smoother. Piston rings are divided into two types: gas rings and oil rings.

The function of the piston pin is to connect the piston and the small end of the connecting rod, and transmit the gas force on the piston to the connecting rod.

The function of the connecting rod is to transmit the force on the piston to the crankshaft and convert the reciprocating motion of the piston into the rotational motion of the crankshaft.

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3. Crankshaft flywheel set

The crankshaft is one of the most important parts of the engine. Its function is to convert the gas force from the piston connecting rod group into the rotational torque of the crankshaft for external output, and to drive the engine’s valve train and other auxiliary devices to work.

The flywheel is a disc with a large moment of inertia, and a ring gear is pressed on the outer edge, which meshes with the drive gear of the starter and is used when the starter engine is used.

2. Working principle

The crank connecting rod mechanism is a transmission mechanism that realizes the working cycle of the internal combustion engine and completes the energy conversion, which is used to transmit force and change the movement mode.
During work, the crank connecting rod mechanism converts the reciprocating motion of the piston into the rotational motion of the crankshaft during the power stroke, and outputs power to the outside, while in the other three strokes, namely the intake, compression, and exhaust strokes, the crankshaft rotates. The motion is transformed into a reciprocating linear motion of the piston.

In general, the crank connecting rod mechanism is the mechanism through which the engine generates and transmits power. It converts the heat energy emitted by the combustion of the fuel into mechanical energy.

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