一个人一把螺丝刀一份安全感为什么说有了螺丝刀就有了安全感呢？预设一个场景：夏天，一个人在家，吹着风扇吃着西瓜玩着电脑，突然风扇不转了，当你意识到它可能坏掉的时候，你的反应是什么？顶着烈日扛着风扇奔赴维修店找到螺丝刀自己进行修理算了，不用风扇了选择A：你需要面对的不只是毒辣的太阳，还有可能产生不菲的修理费，外加漫长的等待时间。不论从哪个角度来看，这都不是很划算的交易。选择B：当你选择自己修理的时候，修理的结果无非是修好或者修坏，修好的话恭喜你又开启了夏天，但是修坏的话也无所谓，反正都是坏的。
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两个内圈（或外圈）小端面相近，中间有隔圈，游隙是靠隔圈的厚薄来调整的，也可用隔圈的厚薄来调整双列圆锥滚子轴承的预过盈。四列圆锥滚子轴承，此种轴承的性能与双列圆锥滚子轴承基本相同，但比双列圆锥滚子轴承承受的径向载荷更大，极限转速稍低，主要用于重型机械。多密封双、四列圆锥滚子轴承，ZWZ提供长寿命、多密封双、四列圆锥滚子轴承。对轴承进行个性化全新设计，改变全密封轴承传统设计方法，采用密封与防尘相结合的*密封结构型式，改善密封效果，提高密封性能。
