| 摘要 |
PURPOSE: To improve the accelerating ability from standstill and the fuel consumption by forming the diameter of the upper and lower parts of an auxiliary combustion chamber and the insertion distance of a glow plug, the radial angle between glow plugs, etc., so as to satisfy the prescribed relationship in a large and low speed methanol engine having the glow plugs in the auxiliary combustion chamber. CONSTITUTION: In a large size and low speed methanol engine having glow plugs 3, 4 in an auxiliary combustion chamber B, each part is formed so as to simultaneously satisfy the inequalities of 35dn<=1G<=45dn, 23 deg.<=θ<=30 deg., 1.5<=D/d<=2.25, 0.65%<=η<=2.25% where d, D are the diameter of the upper and lower parts of the auxiliary combustion chamber B, 1G is the insertion distance of the glow plugs 3, 4,θis the radial angle of two glow plugs in the auxiliary combustion chamber, dn is the diameter of the single injection port of an auxiliary fuel valve 1,ηis the volume ratio of the total volume of the auxiliary combustion chamber B to the total volume of the combustion chamber formed by the top dead center. The large and low speed two-cycle engine excellent in the accelerating ability from standstill and the low fuel consumption and capable of 100% combustion of methanol can be obtained thereby.
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