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AssigneeP. Van Tilburg-Bastianen Revisie B.V.
InventorAlexander Antonius Marinus Peeters
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In a gas combustion engine, which is manufactured by conversion of a diesel engine, the piston shape, the compression ratio, the air intake system and the exhaust gas system are modified. The exhaust gas system is split into two parts, each of which consists of an exhaust branch-piece and a catalyser, whereby catalysers of standard format can be employed, and the air intake system is made smaller, whereby the probability of backfire is reduced. The hollow in the piston already present in the diesel engine is enlarged in diameter and depth, in such a manner that the ratio of the diameter to the depth is equal to 30:11. In this manner, one achieves an optimal form with respect to heat extraction. In addition, enlargement of the hollow causes a lowering of the compression ratio to a value of 1:10, which is necessary when applying gas as a fuel. In addition, the edge of the piston near the top surface of the piston is bevelled, in order to compensate for extra expansion of the piston around the hollow, which extra expansion occurs as a result of the increased combustion temperatures. The costs of the above-specified conversion of a diesel engine to a gas combustion engine are hardly higher than those of a revision service of a diesel engine, so that there is no longer a financial obstacle to conversion to gas as a fuel.
Gas combustion engine comprising a gas exhaust system, an air intake system, an engine block comprising a number of cylinders and pistons, which pistons can be translated in the cylinders, and a cylinder head which delimits a space in the cylinders at one extremity, whereby a volume of the space in a cylinder between the cylinder head and a piston can be varied between a minimal and a maximal value by means of a translatory motion of the piston, a ratio of the said minimal and maximal values defining a compression ratio, a combustion space being defined by the space in that state of the piston which corresponds to a minimal volume, said gas combustion engine being a converted diesel engine, the combustion space and the compression ratio being adapted to application of gas as a fuel, wherein the pistons have a cylindrical wall and a top surface, a hollow being located in the top surface, which hollow forms part of the combustion space and has an approximately circle-cylindrical form and a substantially flat bottom and the hollow has a diameter and a depth, whereby the ratio of the diameter to the depth lies between 30:9 and 30:13, said cylindrical wall of each piston being bevelled near said top surface, an external diameter of each of said pistons decreasing from a first value adjacent a piston ring closest to said top surface to a second value at said top surface, said piston ring being one of a number of piston rings in the cylindrical wall of each of said pistons.
Dependencies are inferred from the claim text.