3 transmission , built in the top drive power head , has two speed range ? high and low . it can meet the requirements of both dth hammer drilling and carbide bit drilling 3动力头设有变速装置，有高低两个档次，以满足潜孔锤钻进及硬质合金回转钻进方法。
A new vehicle power split continuously variable transmission system ( pscvt ) is presented in this paper . the system consists of a variable pulley set , a planetary train , two electromagnetic clutches , a electromagnetic brake etc . electromagnetic clutches and brake are controlled by ecu 针对微型汽车，本文提出了一套功率分流式汽车无级变速系统，系统由一组可变带轮半径的带式无级变速装置和一组行星轮系、离合器及电子控制单元等组成。
Should turn the drum to have the appropriation to decelerate the machince , and have to become to soon equip , and can request , select by examinations to the bestly turn the drum to attain the exaltation product the quantity ' s purpose according to the craft of the different work preface , and turn the drum drum the door to adopt the high - quality stainless steel material to make in to have the good antisepsis with seal completely the function , moreover , have to line up the dirty system , convenient for and dirty water to handle , design forerunner , and cover the area small , usage maintenance convenience 该转鼓配有专用减速器，具有变速装置，可根据不同工序的工艺要求，选取最佳的转鼓达到提高产品质量的目的，转鼓鼓门采用了优质不锈钢材料制成具有很好的防腐和密封性能，另外，配有排污系统，便于污水处理，设计先进，占地面积小，使用维护方便。
Engine and performance : two stroke air cooling engine , powerful ; key parts imported , reliable and durable ; excellent start - up performance of no less than three times ' drawing , easy and convenient to operate ; chain wheel drive , minimum power loss ; constantly variable speed and disk brake guarantee your safety 动力性能：风冷二冲程发动机，功率强大，多种进口件组装，性能稳定可靠，寿命长；优异的启动性能，保证您不超过三次拉动，即可启动发动机；采用无级变速装置及性能优良的碟刹系统，使整车运行安全可靠，操纵方便；链式传动，令功率损失减至最小。
