Patent ID: 6457451
Filing Date: 2002-10-01
Classification: F01C,F02B,Y02T,Y10T

Abstract:
An internal combustion engine comprising,engine housing walls, a working chamber, inlet and exhaust ports, first and second piston assemblies each of which assemblies includes at least one pair of diametrically opposed pistons within said working chamber rotatable about a rotational axis of said piston assemblies and dividing said working chamber into a plurality of pairs of diametrically opposed subchambers, means for interconnecting said first and second piston assemblies for variable-speed rotation of said first and second piston assemblies in the same direction during recurrent periods of rotation such that at least one pair of diametrically opposed subchambers decreases in volume while at least one other pair of diametrically opposed subchambers increases in volume, for each complete revolution of the first and second piston assemblies a plurality of operating cycles are completed, each operating cycle including successive power, exhaust, intake, and compression phases, and said interconnecting means includes first and second gear sets each of which gear set comprises noncircular Wildhaber-Sakita type 1 and type 2 gears, wherein geometry of a noncircular segment of said Wildhaber-Sakita type 1 gear is mathematically defined as Qy={[Q1/(pi)][acos(delta)]+(gamma)[Q1/(pi)]sin[acos(delta)]}/2 wherein delta=(2Dâˆ’3y)/[(gamma)y] and acos=arc cosine, and geometry of a noncircular segment of said Wildhaber-Sakita type 2 gear is mathematically defined as x=D{1+(gamma)cos[Q(pi)/Q1]}/{3+(gamma)cos[Q(pi)/Q1]}wherein gamma=(W0âˆ’2Wmin)/W0, D=Distance between the rotational centers of said Wildhaber-Sakita type 1 and type 2 gears y=Varying radius of said Wildhaber-Sakita type 1 gearâ€”distance between the rotation center and the point of contact with said Wildhaber-Sakita type 2 gear, W0=Rotational speed of said Wildhaber-Sakita type 2 gear, Wmin=Minimum rotational speed of said Wildhaber-Sakita type 1 gear, Q1=Total rotational angle of said Wildhaber-Sakita type 1 gear in a noncircular segment and also the total rotational angle of said Wildhaber-Sakita type 2 gear in a noncircular segment Qy=Rotational angle of said Wildhaber-Sakita type 1 gear measured from the end of the circular arc segment with smaller radius of said Wildhaber-Sakita type 1 gear, x=Varying radius of said Wildhaber-Sakita type 2 gearâ€”distance between the rotation center and the point of contact with said Wildhaber-Sakita type 1 gear, and Q=Rotational angle of said Wildhaber-Sakita type 2 gear measured from the end of the circular arc segment with larger radius of said Wildhaber-Sakita type 2 gear.