论文部分内容阅读
目前,在各种类型的拖拉机、汽车的发动机上,活塞环越来越多的采用扭转环,如上海—45拖拉机、解放牌汽车发动机上等。扭转环是将活塞环作成不对称的断面,它在气缸中工作时,由于不对称断面和弹性力的关系,产生了扭转力矩,使环扭转成如图所示的形状。它的外部下边缘紧贴在气缸壁上,其内部下边缘支撑在活塞的环槽底上。这样能消除活塞环的轴向移动和活塞环在环槽内跳动,也增加了密封性。同时,由于环和气缸壁表面的接触面积减小,压力加大,使磨合时间缩短。而且,当活塞环向上运动时,好像楔子的作用,能在气缸壁上敷一层薄薄的油膜,
Currently, in all types of tractors, car engines, piston rings more and more use of twist rings, such as Shanghai -45 tractors, Jiefang brand car engines and so on. Torsion ring piston ring is made of asymmetric cross-section, it works in the cylinder, due to asymmetric cross-section and the relationship between elastic force, resulting in torsional torque, the ring twisted into the shape shown in the figure. Its outer lower edge abuts against the cylinder wall and its inner lower edge rests on the bottom of the ring groove of the piston. This will eliminate the axial movement of the piston ring and piston ring beating in the ring groove, but also increase the sealing. At the same time, as the contact area of the ring and the cylinder wall surface is reduced, the pressure is increased so that the run-in time is shortened. Moreover, when the piston ring upward movement, it seems wedge effect, can apply a thin layer of oil film in the cylinder wall,