Patent ID: 6772717
Filing Date: 2004-08-10
Classification: F02B,F02D,F16H

Abstract:
A reciprocating piston internal combustion engine comprising a cylinder (3), a piston (4) movably disposed in said cylinder (3), a connecting rod (6) connected to said piston (4), a crankshaft (9) with a crank (8), a transmission element (7) disposed between said connecting rod (6) and said crank (8) for transmitting movement of said piston (4) to said crankshaft (9), means for manipulating movement of said transmission element (7) for affecting movement of said piston (4) for changing the compression ratio of said engine, said transmission element (7) being a transverse lever structure (7) coupled to said connecting rod (6) at a first bearing end (B) thereof, a control arm (10) connected with one end to another other end of said transverse lever structure (7) at a second bearing point (C) thereof, said transverse lever structure (7) being further coupled to said crank (8) at a third bearing point (A) thereof disposed between said first bearing point (B) with said connecting rod and said second bearing point (C) with said control arm (10), said transverse lever structure (7) forming a triangle with a side length a between said first bearing point (B) and said second bearing point (C) of said transverse lever structure (7), a side length b between said second bearing point (C) and said third bearing point (A) and a side length c between said first bearing point (B) and said third bearing point A, said lengths a, b, and c having predetermined length values based on the crank radial length r such that:â€ƒ4.0*r&lE;a&lE;7.0*r, 2.2*r&lE;b&lE;5.5*r, 1.2*r&lE;c&lE;3.5*r.