Patent ID: 6668785
Filing Date: 2003-12-30
Classification: F02B,F02F,Y02T

Abstract:
A piston for an internal combustion engine, said piston comprising:a body member defined by a cylindrical side wall, said body member having a lower end, said lower end having means for connection of said piston to a piston rod, said piston having an upper end defining a piston head, said piston head comprising an upstanding spherical section portion centrally positioned on said piston, said spherical section being hemispherical, said spherical section portion of said piston head having a diameter less than said piston, said spherical section portion flared outwardly and upwardly to the circumferential periphery of said piston head so as to form an annular U-shaped trough about said spherical section portion and an annular crest about said annular trough, said annular crest terminating at and defining said circumferential periphery of said piston head coincidental with cylindrical side wall of said piston.