Inserts YMZ-6, D-65 R-1 root and connecting rod, Kharkov region.

Inserts YMZ-6, D-65 R-1 core and connecting rods

Root and connecting rod liners are radially aligned and loaded by gas pressure forces in the diesel cylinders, as well as by the inertial forces of the moving parts of the crank mechanism. The pressure on the friction surface of the liners during fuel combustion in the cylinders reaches 35..40 MPa and more.

The main requirements for liners are their wear resistance, anti-friction, anti-seize and anti-corrosion properties, thermal conductivity and the ability to absorb abrasive particles in the lubricating oil. Root liners must also have sufficient rigidity, preventing cyclic bending of the crankshaft axis under the action of the listed loads.(//tractor-service.com)

Radial bearings consist of two inserts, about 3 mm thick in connecting rods, and about 4 mm thick in main ones, formed by cold stamping. The basis of the liners is a steel tape, on which a layer of aluminum alloy is poured, and in forced diesels a layer of lead bronze. The third layer is an alloy of lead and tin with a thickness of 0.03...0.04 mm. For the correct installation of the inserts in the sprouts of their beds, the tendrils stamped into them, which enter special grooves in the pastels, are used. When the bolts of the bearing cover are tightened, the liners are loaded into the pastel bore with a tension that prevents them from turning under the action of frictional forces at the shaft necks.

Thrust bearings are loaded by the force of the pressure springs of the clutch when it is turned off, as well as the axial component of the force in the helical gear of the drive mechanism of the gas distribution and fuel distribution mechanismhigh pressure pump, installed on the crankshaft. These forces, as well as the elongation of the shaft when it is heated, are called its axial displacement, which leads to a violation of the advance angles of the fuel supply to the diesel cylinders. Thrust bearings that prevent axial movement of the shaft are four semi-rings. The location of the semi-rings in front of the shank allows the shaft to be unloaded from the force of the compression springs of the clutch. For uniform distribution of the oil flowing out of the main bearing, on the rubbing surfaces of the shaft cheeks and semi-rings, radial grooves are made on the latter. These surfaces of the semi-rings are covered with a layer of anti-friction alloy.насосом высокого давления и фаз газораспределения.

Упорными подшипниками, предотвращающими осевое перемещения вала, является четыре полукольца. Расположения полуколец перед хвостовиком позволяет разгрузить вал от силы нажимных пружин сцепления. Для равномерного распределения масла, вытекающего из коренного подшипника, по трущимся поверхностям щек вала и полуколец, на последних делаются радиальные канавки. Эти поверхности полуколец покрыты слоем антифрикционного сплава.