张紧轮基础知识

1、张紧轮入门知识1、张紧轮得组成摩擦单元、扭簧、轴承、皮带轮及一些构件.2、张紧轮得若干结构型式9图3-11同步齿形带张紧机构（a）压缩弹簧侦紧式枢轴板张紧器（Volvo汽午）（b）张紧弹簧倾紧式枢轴板张紧器（Toyota汽乍）（c）扭赞倾紧式枢轴板张紧器（Ford汽车）（d）偏心轴套调整式张紧器（VW汽车）1 一枢轴板2压缩弹簧3-导向销4 反力柱5枢轴6张紧轮7锁紧螺母8同步齿形帯9扭簧10反力柱销1 1-偏心轴套12固紧螺柱与锁紧螺母13滚珠轴承内外座圈14一张紧弹簧15狭长得调整孔ab）图3-12同步齿形带张紧机构a）压缩弹簧滑板式张紧器（Ford汽车）b）凸轮滑板式张紧器（Pc uge

2、ot汽车）1 一张紧轮轴承2轴承支柱3滑动板4一张紧轮5同步齿形带6-预紧得压缩弹赞7 方头凸轮心轴8凸轮9、13锁紧螺母10凸轮反力片1 1一弹簧座1 2狭长调整孔Hydraulic TensionersTight Side 伽sionerInt e grated T e nsi on e r/ B r a c ke t Ass e m b lies and Module s3、张紧轮得作用及安装(1)增大主动轮与从动轮之间得包角，增大三角带与带轮得接触面积,获得最大摩擦 力，改善皮带得使用条件，同时使传动平稳；(2)张紧轮均要装在松边，紧边得皮带会打滑，松边则不会打滑，减小动弧角度，增 大

3、静弧角度。4、张紧轮得性能测试应用凸轮驱动：幅值 :驱动频率180LI 1ILj i I /w7VIIllir i 1o experimental point fitted curve1601401201008000.050.10.150.20.25030.350.4time (s)s.s) UOCEO/,/J/X1 1199I i n10.050.10.150.20.250.30.350.4time (s)80604020008060性能测试:31323334353637383940angular displacement (degree)Figure 6. Tensioner #4 Cam

4、 1 Test 1 300 rpm T = 119.8 FHysreresisnewHysreresisAfter test疲劳测试:newAfter testVariation:p Freque ncy厂 Oscillation Ambient temperature LoadAnalysis; Wear over life time Torque over life time Damping oyer life timeComponent durability rig testingComponents才 Spring Pulley Bearing Damping system” Spri

5、ng case5、 SAE得测试内容Resistance to environmental media: Hydraulic Oil Watera Cleaner Fuel Oil尸 Salt SprayResult: Resislance to corrosion Funtion and 匚haractenstics of tensioner maintainedEncapsulated bearing and damping system is less susceptible to environmental agentsC on t am i n atio n Tex tC o rr o sion TestHot / Cold Cy c 1 i ng T e stCol d Box T e stHot Box T estLife 1 u gT e st6、计算分析(1)张紧轮分析得模型(qg)Ten