V带无级变速实验装置设计说明书.docVIP

摘 要 无级变速系统(CVT—continuously variable transmission)（以下简称CVT）的内部并没有传统变速箱的齿轮传动结构，而是以两个可改变直径的传动轮，中间套上传动带来传动。基本原理是将传动带两端绕在一个锥形带轮上，带轮的外径大小靠油压大小进行无级的变化。起步时，主动带轮直径变为最大直径，而被动带轮变为最小，实现较高的传动比。随着车速的增加和各个传感器信号的变化，电脑控制系统来断定控制两个带轮的控制油压，最终改变带轮直径的连续变化，从而在整个变速过程中达到无级变速。 而锥形带轮之间的传动带，在过去的一段时间，由于材质的原因，所受的拉力有限，所能承受的扭矩有限，只能用在摩托车式小排量车上。近些年来，随着材料技术、加工工艺的不断提高，生产出特殊材料制造的刚制传动带和锥型带轮。彻底实现了大功率、大扭矩轿车的要求。 关键词： 无级变速系统； V带； 锥型带轮； 实验装置 Abstract Continuously variable transmission do not have the traditional gear transmission structure in the gearbox, but to change the diameter of the two can drive round the middle put transmission bring transmission. Basic principle is to drive around with two ends in a cone-shaped pulley, the pulley on the size of the diameter size of a hydraulic no-change. Start, take the initiative to become the largest diameter pulley diameter, and passive pulley into the minimum and achieve a higher transmission ratio. With the increase in speed and various sensors signal the change, the computer control system to determine control of the two pulley hydraulic control and ultimately change the pulley diameter of continuous change, resulting in the entire process to continuously variable transmission. ???? The cone-shaped pulley between the belts, in the past period of time, because of material reasons, suffered the rally is limited, can bear the torque is limited, can only be used in small-displacement motorcycles on board. In recent years, as materials technology, the continuous improvement of processing, production of special materials to the newly created system of belts and conical pulley. Full realization of the high-power, high torque car requirements. Key word: CVT system； V-belt； Conical pulley； Experimental device 目 录 1 绪论 1 1.1变速理论 1 1.2变速机械 1 1.2.1变速机械工作原理： 1 1.2.2常用的无级变速器主要有以下几种： 2 1.3工作原理及技术参数 3 2 V带无级变速实验装置主要参数设 5 2.1设计数据 5 2.2V带设计 5 2.2.1V带选择 5 2.2.2V带尺寸设计 5 2.3带轮设计 7 2.3.1校核速度 7 2.3.2校核中心距 8 2.3.3校核带长 8 2.3.4确定中心距 8 2.3.5小带轮包角 8 2.3.6单根V带额定功率 9 2.3.7 V带根