International Journal of Automotive Technology. 2024; 25(2): 225-233.
EFFECT OF PISTON PROFILE ON PISTON MOTION AND LINER BORE POLISHING
1Mechanical Engineering Department , College of Engineering Pune
2Sant Gadge Baba Amravati University
3Research and Development Department , Kirloskar Oil Engines Ltd.
ABSTRACT
One of the popular development trends in diesel engine piston assembly is higher reliability and life of components. These
can be ensured by actual engine testing and comparing the appearance of piston assembly. However, testing multiple iterations
involves signifi cant cost and development which can be avoided by using software for piston-assembly performance parameters
simulation. This paper contains a detailed study conducted using commercially available piston secondary dynamics
simulation software and actual testing on a 4-cylinder diesel engine. In this study, the eff ect of piston profi le and clearance
on piston secondary dynamics parameters and piston-liner appearance are studied. In this study, three piston skirt profi les are
designed by varying piston axial profi le (barrel shape), radial profi le (oval shape), and nominal clearances. The simulation
results are studied in which piston profi le 2 has shown minimum piston tilting, radial displacement, radial velocity, tilting
velocity, radial acceleration, tilting acceleration, pressure, and force at TS and ATS. Testing and component merit rating for
liner bores and piston skirts were also conducted in which piston profi le 2 has shown signifi cantly less liner bore polishing.
A good correlation was observed between piston secondary motion parameters obtained from simulation and piston and
liner bore observations after testing.
Keywords :
iston skirt · Piston secondary dynamics · Cylinder bore polishing · Piston profi le · Ovality
