自动挡为啥禁止空档滑行？看完你就懂了
自动变速箱禁止空挡滑行是因为有极小、极小的几率导致“行星齿轮组”在高速空转中得不到油泵足够量的润滑油，导致行星齿轮组的润滑能力不足，存在被过度磨损的潜在可能性！但通常几万辆经常空档滑行的自动挡车，可能不会有任何一辆出现这个问题！因为自动变速箱即便空档，油泵依然继续工作，理论上对行星齿轮组的供油量是完全够用的，但存在不够用的“概率”，所以为了规避风险，往往厂家在说明书上会注明“禁止N档滑行”！
自动挡为啥禁止空档滑行？看完你就懂了© 由 太平洋号 提供
而事实上只要不是高负荷、长时间的空档滑行就没事！比如下那种坡度较大、很长的坡，用N档长时间滑行就有极小的几率导致行星齿轮组供油不足的现象，但在日常生活中等信号前N档滑行个几十米是完全没有伤害的！上述说的小几率供油不足是建立在120KPH（每千米每小时）以上进行空档滑行才可能出现的小几率，所以正常时候低速、短距离滑行是不会有任何问题的！
自动挡为啥禁止空档滑行？看完你就懂了© 由 太平洋号 提供
自动变速箱是依靠ATF的循环来进行润滑、散热的，当变速箱切至N档，油泵依然是在工作的！因为油泵是靠变速箱的输入轴提供动力来驱动ATF循环的，虽然变速箱切至N档，但实际上的N档的怠速是有转速的，说白了就是发动机怠速而并未熄火，而这怠速转钜依然会传递到变速箱的输入轴上，而输入轴会继续驱动油泵工作，所以说自动挡切N，油泵不工作的说法并不科学！
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