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怎么检验消防车传动轴布局设计是否合格?-j9九游会网址


    传动轴大概意思就是传递动力的轴。在整个汽车行业中传动轴是将发动机的动力通传递给驱动轮,进而使车辆能够行驶。然而在消防车行业里,除了驱动车辆行驶的传动轴以外,我们还经常会见到用于驱动水泵、发电机或液压泵等负载的传动轴。传动轴作为车辆的重要组成部分,其设计方案的正确与否在很大程度上影响着整车的动力性、平稳性及可靠性等方面。
 
 
      检验消防车传动轴布局设计合格的条件如下所示:
 
  1、传动轴选型
 
  检验选择的传动轴能否承载传动扭矩。举例来说,取力器驱动额定流量为1500gpm(95l/s)的水泵,需选用spicer1410系列的传动轴;而驱动额定流量为3000gpm(190l/s)的水泵,负载扭矩增大了,此时spicer1410系列的传动轴就不能满足使用要求,则需选用能承受更大扭矩的spicer1550系列的传动轴。
 
 
  2、传动轴长度
 
 
  根据最高转速和传动轴直径,审核传动轴长度。以外管壁直径为3.5"(90mm)或4"(100mm),壁厚为0.095"(2.4mm)的spicer1410系列传动轴为例。该系列管径为3.5"(90mm)的传动轴,在转速2500r/min下,传动轴长度(传动轴两端万向节的中心距)最大可为68"(1727mm);而管径为4"的传动轴,在相同转速下,传动轴长度最大可为72.75"(1848mm)。如果转速增加到3500r/min,管径3.5"(90mm)的传动轴最大长度减少至57.25"(1454mm),管径4"(100mm)的传动轴最大长度降低至61.5"(1562mm)。传动轴长度不能超出该转速和直径下的最大长度,否则不合格。
 
  3、传动轴平衡
 
 
  传动轴平衡要满足iso-1940标准中规定的#16等级要求。为了更平稳的传递动力,darley公司让最卓越的传动轴制造商来检查传动轴的平衡性能,精确的添加平衡块,确保运转性能和可靠性满足标准。规范的传动轴制造商是可以提供平衡检验报告的,传动轴的平衡检验报告作为整车的设计文件应该由消防车生产厂家存档备查。
 
  4、传动轴安装位置
 
 
  传动轴安装位置影响扭转振动的大小,设计要求最大扭转振动要在限值以内。扭转振动是由于传动轴非匀速旋转所产生的,也就是说,除非用一根传动轴直接与负载连接,否则或多或少都会产生扭转振动,但这样对传动轴性能要求过高,很难满足,所以这种方式在消防车上一般不被采用。对于多个传动轴连接的传动方式,通过调整传动轴相互间的安装位置,将扭转振动控制在限值以内,运转时就不会有明显振动,且使用寿命也会增长,运行更平稳。调整后实际的扭转振动值,可以借助allison传动装置软件来计算。经过反复调整和计算,直至传动轴扭矩加速度值小于500rad/sec?,扭转驱动加速度值小于1000rad/sec?,扭转惯性加速度值小于1000rad/sec?,才证明该安装位置是合格的。
 
  只要满足以上四点检验要求,这样的传动轴设计就是合格的,反之就是不合理的。
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