The crank mechanism is probably the most important engine system. The purpose of the crank mechanism is to convert the reciprocating motion into rotational and vice versa.

All parts of the crank mechanism are divided into two groups: moving and stationary. For mobile include:

• piston,
• crankshaft,
• flywheel.

To immobile:

• cylinder head and cylinder block
• crankcase cover.

The device crank mechanism

The piston is like an inverted cup in which the rings are stacked. On any of them there are two types of rings: oil scraper and compression. Oil scrapings are usually put two, and compression - one. But there are exceptions in the form: two such and two such - it all depends on the type of engine.

The rod is made of I-steel profile. Consists of the upper head, which is connected to the piston with a finger, and the bottom - the connection with the crankshaft.

The crankshaft is made mainly from high-strength cast iron. It is a non-axial rod. All necks are carefully polished, in compliance with the required parameters. There are main journals - for installation of main bearings, and connecting rod - for installation through bearings of connecting rods.

The role of sliding bearings is performed by split half rings, made in the form of two liners, which are treated with high frequency currents for durability. All of them are covered with an anti-friction layer. Radicals are attached to the engine block, and the connecting rod - to the lower head of the connecting rod. To liners work well, they make grooves for oil access. If the liners are cranked, then there is an insufficient supply of oil to them. This usually occurs when the oil system is clogged. Inserts are not subject to repair.

Longitudinal movement of the shaft is limited by special thrust washers. At both ends, it is imperative to use different glands to prevent oil from escaping from the engine lubrication system.

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К передней части коленвала крепится шкив привода системы охлаждения и звездочка, которая приводит в действие распредвал при помощи цепной передачи. На основных моделях выпускаемых сегодня автомобилей ей на замену пришел ремень. К задней части коленчатого вала крепится flywheel. Он предусмотрен для устранения дисбаланса вала.

It also has a ring gear designed to start the engine. To avoid any problems during disassembly and further assembly, the flywheel fasteners are made using a non-symmetrical system. The timing of ignition also depends on the location of its installation marks - hence, the optimum engine operation. In the manufacture of its balance with the crankshaft.

The crankcase is manufactured together with the cylinder block. It serves as the basis for mounting the timing and crank. There is a pallet, which serves as a container for oil, as well as to protect the engine from deformation. Below there is a special plug to drain the engine oil.

The principle of the CMR

The piston is pressurized by gases that are produced during the combustion of the fuel mixture. At the same time, it performs a reciprocating motion, forcing the engine to crank. From him the rotational movement is transmitted to the transmission, and from there to the wheels of the car.

But the video shows how the KSHM works in the tuned VAZ-2106:

The main symptoms of a crankshaft failure:

• knocking in the engine;
• power loss;
• lower oil level in the crankcase;
• Exaggerated opacity.

The crank mechanism of the engine is very vulnerable. For efficient operation, timely replacement of oil is necessary. It is best to produce it at service stations. Even if you have recently changed the oil, and it is time for seasonal maintenance - be sure to go to the oil, which is indicated in the instruction manual of the machine. If there are any problems in the operation of the engine: noise, knocking - contact the specialists - only in an authorized center you will be given an objective assessment of the condition of the car.

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