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“脚感”判断液压制动系统故障

发(fa)布时间:2017-08-18 浏览次数:3221

                                         “脚感”判断液压制动系统故障

当车辆液(ye)压制(zhi)动系(xi)统出(chu)现(xian)制(zhi)动失效等故(gu)障(zhang)时(shi),可用“脚感法”来快速(su)诊断,查出(chu)故(gu)障(zhang)原因及故(gu)障(zhang)部位(wei),以(yi)避免盲目拆卸(xie)。

  ①用(yong)脚尖轻(qing)踏(ta)(ta)(ta)制动踏(ta)(ta)(ta)板,若(ruo)踏(ta)(ta)(ta)板踏(ta)(ta)(ta)到全程的2/3时才感(gan)觉(jue)有制动阻力,说明踏(ta)(ta)(ta)板自由行程过(guo)大。

  ②若制(zhi)动(dong)(dong)踏板可以无阻力(li)地踩到(dao)底,且连踩几(ji)脚(jiao)时仍感觉(jue)踏板无阻力(li),踏板位置也不能随之升高,则说明故障(zhang)原因(yin)是(shi)制(zhi)动(dong)(dong)总泵中缺少制(zhi)动(dong)(dong)液(ye),或储(chu)液(ye)箱盖通气孔(kong)堵塞,或制(zhi)动(dong)(dong)皮(pi)碗破裂(lie)、踏翻所致(zhi)。应向(xiang)储(chu)液(ye)箱内(nei)添加(jia)制(zhi)动(dong)(dong)液(ye),疏通通气孔(kong),更换制(zhi)动(dong)(dong)皮(pi)碗。

  ③若制(zhi)动(dong)(dong)踏板(ban)可以(yi)一脚(jiao)踩(cai)到(dao)底(di),但在(zai)连(lian)踩(cai)几脚(jiao)后感(gan)觉踏板(ban)位置升高(gao);而(er)间隔一段时间再次踏下踏板(ban)时,踏板(ban)又可以(yi)踩(cai)到(dao)底(di),这说(shuo)明制(zhi)动(dong)(dong)管路中压力太低,其(qi)原因是制(zhi)动(dong)(dong)皮碗老化变质,回油阀(fa)密封不(bu)严,制(zhi)动(dong)(dong)总泵(beng)或分泵(beng)活塞与(yu)缸壁(bi)磨损使间隙过大(da)所致(zhi),应(ying)更换制(zhi)动(dong)(dong)皮碗、活塞,清洗回油阀(fa)。

  ④若在(zai)快速(su)踩下(xia)制动(dong)(dong)(dong)踏板(ban)时(shi)感(gan)觉自(zi)由行程较小(xiao),制动(dong)(dong)(dong)有效(xiao)(xiao);而在(zai)缓(huan)慢踏下(xia)制动(dong)(dong)(dong)踏板(ban)时(shi),感(gan)觉自(zi)由行程较大,制动(dong)(dong)(dong)无(wu)(wu)效(xiao)(xiao),则说(shuo)明制动(dong)(dong)(dong)总泵皮(pi)(pi)碗磨损(sun),此时(shi)若感(gan)觉踏板(ban)在(zai)继续向下(xia)移动(dong)(dong)(dong),则说(shuo)明制动(dong)(dong)(dong)管路在(zai)渗漏(lou)。首先(xian)检查制动(dong)(dong)(dong)管有无(wu)(wu)破裂(lie),管接(jie)头有无(wu)(wu)松动(dong)(dong)(dong);再检查总泵推杆防尘套(tao)处和(he)车轮(lun)制动(dong)(dong)(dong)翼处有无(wu)(wu)制动(dong)(dong)(dong)液漏(lou)出,若有,则说(shuo)明总泵或(huo)分泵皮(pi)(pi)碗老化破裂(lie)或(huo)踏翻,应予更(geng)换。

  ⑤若踏下制动踏板时感觉(jue)软绵绵的,富(fu)有弹性,则说(shuo)明制动液中进(jin)入了(le)空气,应排(pai)气。

  ⑥若踏(ta)下制(zhi)(zhi)动(dong)(dong)(dong)踏(ta)板(ban)时感觉踏(ta)板(ban)很硬或踩(cai)不动(dong)(dong)(dong),说明(ming)制(zhi)(zhi)动(dong)(dong)(dong)管(guan)路有沉淀,或制(zhi)(zhi)动(dong)(dong)(dong)总泵及分泵皮碗膨胀、变形以(yi)致卡死等(deng)。应更换(huan)制(zhi)(zhi)动(dong)(dong)(dong)皮碗,清(qing)洗制(zhi)(zhi)动(dong)(dong)(dong)管(guan)路。

  ⑦踏下制(zhi)动踏板后松开,若踏板不能回(hui)复原位,则说明制(zhi)动总泵回(hui)油(you)阀或回(hui)油(you)孔(kong)堵塞;若此(ci)时总泵伴有“扑(pu)哧”、“扑(pu)哧”的响声,说明总泵皮碗被踏翻(fan),应重新(xin)装(zhuang)配(pei)或更换。

  ⑧装(zhuang)有快速(su)自(zi)(zi)锁接头(tou)的(de)液压制(zhi)动(dong)(dong)(dong)系统,若出现慢踩制(zhi)动(dong)(dong)(dong)踏板(ban)时制(zhi)动(dong)(dong)(dong)有效,而快踩制(zhi)动(dong)(dong)(dong)踏板(ban)时制(zhi)动(dong)(dong)(dong)无效,则说明是快速(su)自(zi)(zi)锁接头(tou)装(zhuang)反(fan)或接头(tou)处两个弹簧力调整不当所致(zhi),这样在(zai)急速(su)踩下制(zhi)动(dong)(dong)(dong)踏板(ban)时,接头(tou)产生自(zi)(zi)锁现象,制(zhi)动(dong)(dong)(dong)液不能通过(guo)。应重装(zhuang)装(zhuang)配接头(tou),并将来油端接头(tou)弹簧适当调低(di)。

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