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三、主要零部件的设计1.气缸体根据气缸中心距保持与CA15型发动机相同的设计原则,缸体长度亦保持不变(825mm)。采用七道主轴承全支承形式。从曲轴中心至缸体顶面为303mm,龙门高度仍为70mm。为了保证20万km的大修里程,镶有干式铌合金铸铁缸套,以提高耐磨性。挺杆导向体采取可拆式。因此,气缸体本身没有和其它零件相摩擦部位,所以对其耐磨性能没有特殊要求。但是由于发动机的动力指标和额定转速的提高,对气缸体强度要求相应提高,除了对一些受力部位适当布置加强筋外,在材料上也选用了高强度的HT25—47铸铁。
Third, the design of the main components 1. Cylinder cylinder center distance to maintain the same design principles and CA15 engine, the cylinder length also remains unchanged (825mm). Seven main bearings with full support form. From the center of the crankshaft to the top of the cylinder is 303mm, gantry height is still 70mm. In order to ensure that 200,000 km of overhaul mileage, inlaid with a niobium alloy cast iron cylinder liner to improve wear resistance. Tappet guide to take removable. Therefore, the cylinder body itself and no friction parts with other parts, so its wear resistance no special requirements. However, due to the improvement of the engine’s dynamic index and rated speed, the strength of the cylinder body needs to be increased accordingly. In addition to the proper arrangement of the reinforcing ribs for some stressed parts, the HT25-47 cast iron with high strength is also selected as the material.