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The connecting rod group is composed of the connecting rod body, the connecting rod
big head cover, the connecting rod small head bushing, the connecting rod big head axle
bush and the connecting rod bolt (or screw). The connecting rod group bears the action of
the gas acting on the piston pin and its own swing and the reciprocating inertia force of the
piston group, and the magnitude and direction of these forces change periodically. Therefore
, the connecting rod is subjected to alternating load such as compression and stretching.
The connecting rod must have sufficient fatigue strength and structural stiffness. The lack of
fatigue strength often causes the breakage of the connecting rod or connecting rod bolts,
which leads to a major accident of the whole machine. If the stiffness is insufficient, the
bending deformation of the rod and the deforming of the large head of the connecting rod
will be caused, and the eccentric wear of the piston, cylinder, bearing and crank pin will be caused.
The connecting rod body is made up of three parts. The part connected with the piston pin is called
the connecting rod small head. The part connected to the crankshaft is called the connecting rod
big head, and the connecting rod with the big head is called the connecting rod body.
In order to reduce the wear between the piston pin and the piston pin, the thin-walled bronze
bushing is pressed into the small head hole. A hole or milling groove on a small head and bushing
to make the splash of oil into the matching surface of the lubricating liner and the piston pin.
The connecting rod body is a long rod, which is also stressed in the work. In order to prevent the
bending and deformation of the rod, the rod must have enough stiffness. For this reason, most of
the connecting rod members of vehicle engines use I-shaped section. The I-section can minimize
the mass under the condition of enough stiffness and strength, and the highly reinforced engine
has a H shape section. Some jet engine uses oil cooling piston connecting rod, rod longitudinal
through holes shall be in. In order to avoid stress concentration, connecting rod body with small
head and large head are smooth transition with large circular arc.