Patent ID: 7389764

Claim:
A piston for a diesel engine, the piston having a crown and a three-dimensional shape defined in an x-y-z coordinate space, the z-axis generally defining a cylinder axis of the piston, and the plane z=0 generally intersecting an upper rim of the crown, the piston comprising: a combustion bowl recessed in the crown, the combustion bowl having a center point on the z-axis and having a two-dimensional partial cross-sectional configuration defined by a peripheral line connecting coordinate points (x i ,y i ,z i ) in the x-y-z coordinate space, the (x i ,y i ,z i ) coordinate points including selected points from a coordinate set S and shown in the following table Sa; COORDINATE SET Sa x i y i z i i (mm) (mm) (mm) 1 30.4087 0.0000 0.0000 9 29.9952 0.0000 −0.0581 16 29.6587 0.0000 −0.2010 22 29.4050 0.0000 −0.3853 46 28.9087 0.0000 −1.5000 51 28.9894 0.0000 −4.1358 54 29.1424 0.0000 −4.9766 73 30.8084 0.0000 −10.1331 83 30.1320 0.0000 −13.8251 86 29.3976 0.0000 −14.9200 96 25.1501 0.0000 −17.0525 105 20.1580 0.0000 −15.7026 114 14.9283 0.0000 −12.5121 122 10.4638 0.0000 −10.0041 133 5.2036 0.0000 −8.1249 147 0.0000 0.0000 −7.4832.