Crankshaft is one of the most important moving
parts in internal combustion engine. Crankshaft is a
large component with a complex geometry in the
engine, which converts the reciprocating
displacement of the piston into a rotary motion. This
study was conducted on a single cylinder 4- stroke
diesel engine. It must be strong enough to take the
downward force during power stroke without
excessive bending. So the reliability and life of
internal combustion engine depend on the strength of
the crankshaft largely. And as the engine runs, the
power impulses hit the crankshaft in one place and
then another. The torsional vibration appears when a
power impulse hits a crankpin toward the front of the
engine and the power stroke ends. If not controlled, it
can break the crankshaft.
Jian Meng et al. [3] analyzed crankshaft model and
crank throw were created by Pro/ENGINEER
software and then imported to ANSYS software. The
crankshaft deformation was mainly bending
deformation under the lower frequency. And the
maximum deformation was located at the link
between main bearing journal, crankpin and crank
cheeks.
Gu Yingkui et al. [6] researched a three-dimensional
model of a diesel engine crankshaft was established
by using PRO/E software. Using ANSYS analysis
tool, it shows that the high stress region mainly
concentrates in the knuckles of the crank arm & the
main journal and the crank arm & connecting rod
journal ,which is the area most easily broken.
Xiaorong Zhou et al. [7] described the stress
concentration in static analysis of the crankshaft
model. The stress concentration is mainly occurred in
the fillet of spindle neck and the stress of the
crankpin fillet is also relatively large. Based on the
stress analysis, calculating the fatigue strength of the
crankshaft will be able to achieve the design
requirements. From the natural frequencies values, it
is known that the chance of crankshaft resonant is
unlike. This paper deals with the dynamic analysis of
the whole crankshaft. Farzin H. Montazersadgh et al.
[8] investigated first dynamic load analysis of the
crankshaft. Results from the FE model are then
presented which includes identification of the
critically stressed location, variation of stresses over
an entire cycle, and a discussion of the effects of
engine speed as well as torsion load on stresses.