中置双顶液压油缸导向限位结构研究

Research on the Guiding and Limiting Structure of Center Mounted Double Top Hydraulic Cylinder

本文提出了一种自卸车中置双顶液压油缸导向限位结构,是把油缸缸筒卡键由圆形改为方形结构(圆形结构力量是发散型的,易滚动;而方形结构力量聚集型的,不易滚动),包括一级缸筒、二级缸筒、三级缸筒等每级缸筒的两个圆形卡键改为方形卡键,油缸头部增加一L型支撑环不仅有利于油缸更好的定位,防尘圈也不被挤出,还有利于保证油缸行程,缸筒总长在原有基础上增加30mm,使油缸举升更加稳定;在油缸尾部每级缸筒上增加两个方形卡键和一个支撑环,有利于油缸更好的导向、限位,安全性更高,油封密封更严实等优点。改进后中双油缸不仅可以抑制油压压力过大造成油缸缸筒限位失效造成脱落质量问题,还解决了油缸密封不严,导致漏油问题;大大提高了油缸的安全性能,延长了油缸的使用寿命,保证了油缸举升的稳定性;该结构具有工艺简单、安全可靠,便于推广应用的优点。

In this paper,a kind of guiding and limiting structure of double top hydraulic cylinder in dump truck is proposed.The clamping key of oil cylinder is changed from circular to square structure(the force of circular structure is divergent and easy to roll;while the force of square structure is concentrated,which is not easy to roll),including the fi rst stage cylinder,the second stage cylinder and the third stage cylinder,and the two round bayonets of each stage cylinder are changed into square ones.Adding an L-shaped support ring is not only conducive to the better positioning of the oil cylinder,while the dust ring is not squeezed out,but also conducive to ensuring the oil cylinder stroke.The total length of the cylinder barrel is increased by 30mm on the original basis to make the lifting of the oil cylinder more stable;two square keys and a support ring are added on each stage of the cylinder at the tail of the oil cylinder,which is conducive to the better guide and limit of the oil cylinder,higher safety and tighter oil seal and so on.After the improvement,the middle and double oil cylinders can not only restrain the excessive oil pressure which causes the cylinder barrel limit failure,resulting in falling off quality problems,but also solves the oil cylinder sealing problem,which leads to oil leakage;greatly improves the safety performance of the oil cylinder,extends the service life of the oil cylinder,and ensures the stability of the oil cylinder lifting;the structure has the advantages of simple process,safety and reliability,and is easy to be popularized and applied.