汽车起动系统组成及部件

1、授课老师：韦婧婧 陈扬0102 串励直流电动机由转子、定子、前后端盖、电刷与电刷架等组成 电刷与电刷架的作用是将电流引入电动机，使电枢产生定向转动力矩。电刷一般用铜粉（80%-90%）和石墨粉压制而成，以有利于减小电阻及耐磨性。端盖分为前、后两端盖分为前、后两个个后端盖一般用钢板后端盖一般用钢板压制而成，其上装压制而成，其上装有有4 4个电刷架个电刷架前端盖用铸铁浇铸前端盖用铸铁浇铸而成。它们分别装而成。它们分别装在机壳的两端，靠在机壳的两端，靠两个长螺栓与起动两个长螺栓与起动机壳紧固在一起。机壳紧固在一起。作用（1）起动时将电枢的电磁转矩传递给发动机飞轮；（2）起动后，发动机带动起动机时，啮

2、合机构立即打滑，即具有单向传递动力的作用类型滚柱式、摩擦片式、扭簧式、棘轮式 发动机起动时，使起动机的驱动齿轮和发动机飞轮齿环啮合，将电动机的转矩传给飞轮发动机起动后，自动切断动力传递，防止电动机被发动机带动，超速旋转而破坏。起动机驱动齿轮与曲轴飞轮齿环之间的传动比很大，在传动机构中设置了单向离合器，起动时传递动力。端子50启动接柱（保持线圈）端子C附加电阻的短路接柱（吸引线圈）端子30常电接柱断开点火开关03磁场绕组（定子）的检测绝缘电刷-绝缘电刷 2 正常绝缘电刷-外壳 正常转向器片-转向器片 2 正常转向器片-电枢铁芯 2 正常 握住外座圈，转动驱动齿轮，应能自由转动；反转时不应转动，否

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