Structural components:
The connecting rod body is composed of three parts, the part connected with the piston pin is called the connecting rod head; The part connected with the crankshaft is called the connecting rod head, and the connecting rod body is called the connecting rod body.
The connecting rod head is mostly of thin-walled circular structure. In order to reduce the wear between the connecting rod and the piston pin, the thin-walled bronze bushing is pressed into the hole of the connecting rod head. Drill or mill grooves in the small head and bushing to allow the spatter to enter the mating surface of the lubricated bushing and piston pin.
Connecting rod body is a long rod, in the work of the force is large, in order to prevent its bending deformation, the rod body must have enough stiffness. For this reason, the connecting rod body of the vehicle engine mostly uses Ⅰ shaped section, the flat section can minimize the mass under the condition of sufficient stiffness and strength, and the high strengthening engine has the use of H shaped section. Some engines use connecting rod small head jet oil to cool the piston, must be drilled in the longitudinal shaft hole. In order to avoid stress concentration, the connecting rod body and the small head and large head are smooth transition by large circular arc.
In order to reduce the vibration of the engine, the quality difference of the connecting rod of each cylinder must be limited to the minimum range. When the engine is assembled in the factory, it is generally grouped according to the large and small head mass of the connecting rod in grams, and the same group of connecting rod is selected for the same engine.
V type engine, the left and right two columns of the corresponding cylinder share a crank pin, connecting rod has parallel connecting rod, fork connecting rod and main and auxiliary connecting rod three types.
