机轮安装程序中“松开轴螺母到几乎为零的力矩”B737系列机务在线

ryn_82 发表于 2024-3-1 20:58:33

机轮安装程序中“松开轴螺母到几乎为零的力矩”

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                           <span style="color: #000000;white-space-collapse: preserve;">换轮是飞机维修中最基本的拆装工作，本期回答一个问题，关于737 飞机安装机轮时轴螺母二次拧紧的。</span>
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                           <span style="color: #000000;white-space-collapse: preserve;">不知道你也想过同样的问题没有？</span><br/>
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            <span style="font-size: 15px;color: #d92142;">▲</span><span style="font-size: 15px;">737NG更换主轮</span>
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                        <strong>1</strong>
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               <strong>事件背景</strong>
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   <span style="font-size: 15px;">来自航线维修人员的问题，关于737 飞机换轮工卡中的：</span>
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   <span style="font-size: 15px;letter-spacing: 2px;text-align: justify;color: #d92142;">▲</span><span style="font-size: 15px;letter-spacing: 2px;text-align: justify;">更换737NG前轮中文简卡</span>
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   <span style="font-size: 15px;letter-spacing: 2px;text-align: justify;">工卡中有一步是要求<span style="font-size: 15px;letter-spacing: 2px;text-align: justify;color: #d92142;"><strong>松开轴螺母到接近0力矩</strong></span>，并要求记录此步骤实际力矩值。</span>
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   <span style="font-size: 15px;letter-spacing: 2px;text-align: justify;">这一步该如何做呢？其实问题就是「松开轴螺母到接近0力矩」，这里的接近0力矩，有没有一个规定的范围。</span><strong style="text-align: center; color: #d92142; font-size: 16px; letter-spacing: 0.544px;"></strong>
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   <span style="font-size: 15px;letter-spacing: 2px;text-align: justify;">参考737NG 更换前轮手册，AMM TASK 32-45-21-400-801：<br/></span>
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   <span style="font-size: 15px;letter-spacing: 2px;text-align: justify;color: #d92142;">▲</span><span style="font-size: 15px;letter-spacing: 2px;text-align: justify;">安装前轮</span>
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   <span style="font-size: 15px;letter-spacing: 2px;text-align: justify;">安装主轮的其实也类似：</span>
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   <span style="font-size: 15px;letter-spacing: 2px;text-align: justify;color: #d92142;">▲</span><span style="font-size: 15px;letter-spacing: 2px;text-align: justify;">安装主轮</span>
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   <span style="font-size: 15px;letter-spacing: 2px;text-align: justify;">只不过主轮程序此步骤下面还额外多了一个NOTE：</span>
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   <span style="letter-spacing: normal;"><span style="font-size: 15px;letter-spacing: normal;text-align: justify;"><span style="color: #008000;font-family: Arial, "Arial Unicode MS", sans-serif;font-size: 13.3333px;font-weight: 700;text-align: start;text-indent: -56px;text-wrap: wrap;background-color: #ffffff;text-decoration: underline;">NOTE:</span><span style="color: #008000;font-family: Arial, "Arial Unicode MS", sans-serif;font-size: 13.3333px;font-weight: 700;text-align: start;text-indent: -56px;text-wrap: wrap;background-color: #ffffff;">  The function is to keep the bearing seated.</span></span><span style="color: #008000;font-family: Arial, "Arial Unicode MS", sans-serif;font-weight: 700;text-indent: -56px;text-wrap: wrap;text-align: justify;background-color: #fffb00;font-size: 15px;letter-spacing: normal;">It is necessary to re-seat the wheel if the nut is set to zero torque.</span></span>
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   <span style="font-size: 15px;letter-spacing: 2px;text-align: justify;">特别要注意这个NOTE，轴螺母一定不能松到0力矩，否则还需要重复前面的第1步，重新拧紧轴螺母，然后再松，再第二次拧紧到手册要求的最终低力矩值。<br/></span>
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                        <strong>2</strong>
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               <strong>问题分析</strong>
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   <span style="font-size: 15px;">其实很对问题，网上已经有人给出了答案，我们只需要会搜索就行。</span>
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   <span style="font-size: 15px;">比如本案例中，我们只需要简单的用手册中的原文搜索：</span>
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<p style="padding-right: 0.5em; padding-left: 0.5em; text-wrap: wrap; letter-spacing: 2px;">
   <span style="font-size: 15px;">就会发现机务在线上早就类似的内容了：</span>
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   <span style="font-size: 15px;">可以发现，早期的737NG安装主轮手册里，确实是给出了松后的轴螺母力矩范围：<strong><span style="font-size: 15px;color: #000000;">10~30磅尺</span></strong>。</span>
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   <span style="font-size: 15px;">但是为什么后面又改成「almost zero torque」了呢？</span>
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   <span style="font-size: 15px;">如果你真的这么去量过松后力矩，就肯定知道，要让松后的力矩在10~30磅尺是非常困难的，一不小心，就会把轴螺母全松了，然后又得重新拧紧轴螺母到500~600 磅尺，然后再去尝试松到10~30磅尺……</span>
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   <span style="font-size: 15px;">针对这个问题，厂家又把「10-30 pound-feet 」改回了「almost zero torque」。</span>
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   <span style="font-size: 15px;">其实A320的手册也是类似的，开始手册也是给出了松后轴螺母的力矩范围：</span>
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   <span style="font-size: 15px;">只不过空客改的更彻底一下，并没有要求松到「almost zero torque」：<br/></span>
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   <span style="font-size: 15px;">而是用了一个词「gradually」，逐渐地的松开。</span>
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                        <strong>3</strong>
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               <strong>维护提示</strong>
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   <span style="font-size: 15px;">安装机轮时需要磅两次力矩，第一次磅到一个较高的力矩是为了提供一个磅紧预紧力，使机轮内的轴承（外圈、内圈、滚柱等）紧密接合，也就是轴承装到位（the bearing seated）。</span>
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   <span style="font-size: 15px;"><img data-imgfileid="100045573" style="letter-spacing: 0.578px; text-align: left; box-shadow: #d2d2d2 0em 0em 0.5em 0px;" src="https://newcdn.96weixin.com/mmbiz.qlogo.cn/sz_mmbiz_png/h7ziaAsUicoHicxFJZHx2iaHiclPtdRtEOy3AZMBWc7bL5FWNOetzaorSwTXvtN3DDXYjKnicjQUZgDJVKAasnXnJPxg/640?wx_fmt=png&from=appmsg"/></span>
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   <span style="font-size: 12px;letter-spacing: normal;color: #3daad6;">更多内容可参考737-SL-32-149：POSSIBLE CAUSES OF LANDING GEAR WHEEL LOSSES AND WHEEL BEARING FAILURES</span>
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   <span style="color: #d92142;"><strong><span style="font-size: 15px;">注意第一次磅完力矩以后，松螺帽的力矩也是有要求的，不能是全松状态。</span></strong></span><span style="font-size: 15px;"></span>
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<p style="padding-right: 0.5em; padding-left: 0.5em; text-wrap: wrap; letter-spacing: 2px;">
   <span style="font-size: 15px;"><span style="color: #008000;font-family: Arial, "Arial Unicode MS", sans-serif;font-size: 13.3333px;font-weight: 700;letter-spacing: normal;text-align: start;text-indent: -56px;text-wrap: wrap;background-color: #ffffff;text-decoration:underline;">NOTE:</span><span style="color: #008000;font-family: Arial, "Arial Unicode MS", sans-serif;font-size: 13.3333px;font-weight: 700;letter-spacing: normal;text-align: start;text-indent: -56px;text-wrap: wrap;background-color: #ffffff;"> </span></span><span style="color: #008000;font-family: Arial, "Arial Unicode MS", sans-serif;font-weight: 700;letter-spacing: normal;text-align: start;text-indent: -56px;text-wrap: wrap;font-size: 15px;background-color: #fffb00;font-size: 15px;">The function is to keep the bearing seated.</span><span style="color: #008000;font-family: Arial, "Arial Unicode MS", sans-serif;font-size: 13.3333px;font-weight: 700;letter-spacing: normal;text-align: start;text-indent: -56px;text-wrap: wrap;background-color: #ffffff;">It is necessary to re-seat the wheel if the nut is set to zero torque </span>
</p>
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   <span style="color: #008000;font-family: Arial, "Arial Unicode MS", sans-serif;font-size: 13.3333px;font-weight: 700;letter-spacing: normal;text-align: start;text-indent: -56px;text-wrap: wrap;background-color: #ffffff;"><br/></span>
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   <span style="color: #008000;font-family: Arial, "Arial Unicode MS", sans-serif;font-size: 13.3333px;font-weight: 700;letter-spacing: normal;text-align: start;text-indent: -56px;text-wrap: wrap;background-color: #ffffff;">（松螺帽不能到全松）这样做的目的是保持轴承还在入位状态。否则，还需要磅到预紧力矩使轴承入位。</span>
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   <span style="font-size: 15px;"><br/></span>
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   <span style="font-size: 15px;">后面第二次磅紧的力矩是最终力矩，是比预紧力矩低得多的一个值。这将确保车轮轴承正确固定在机轮组件内，并最大限度地减少机轮轴螺母上的载荷。</span>
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   <span style="font-size: 15px;">最后回到本文之前的问题。</span><span style="font-size: 15px;">个人观点：</span><strong><span style="font-size: 15px;">不需要测量</span><span style="font-size: 15px;">松螺帽后</span><span style="font-size: 15px;">的力矩，但要特别注意的是不能全松了。</span></strong><span style="font-size: 15px;"></span>
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<p style="padding-right: 0.5em; padding-left: 0.5em; text-wrap: wrap; letter-spacing: 2px;">
   <span style="font-size: 15px;">而在其他一些地方，拧紧-松-再拧紧的目的其实主要是确保正确安装到位，主要用于一些关键的位置，但并没有「预紧力」。</span>
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   <span style="font-size: 15px;">比如发动机的PS3管路：</span>
</p>
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   <span style="letter-spacing: 2px;text-align: justify;font-size: 15px;color: #d92142;">▲</span><span style="letter-spacing: 2px;text-align: justify;font-size: 15px;">PS3管路如果松脱会导致空停</span>
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<p style="padding-right: 0.5em; padding-left: 0.5em; text-wrap: wrap; letter-spacing: 2px;">
   <span style="font-size: 15px;">注：预紧力会比最终组装力矩值高。</span>
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   <span style="font-size: 15px;"><br/></span>
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<p style="padding-right: 0.5em; padding-left: 0.5em; text-wrap: wrap; letter-spacing: 2px;">
   <span style="font-size: 15px;">最特别可能是发动机燃油泵QAD 螺栓的力矩了：</span>
</p>
<p style="text-align: center;padding: 0px 0.5em;">

</p>
<p style="padding-right: 0.5em; padding-left: 0.5em; text-wrap: wrap; letter-spacing: 2px;">
   <span style="font-size: 15px;">除了要磅多次以外，还需要在发动机试车完再次磅到最终力矩：</span>
</p>
<p style="padding-right: 0.5em; padding-left: 0.5em; text-wrap: wrap; letter-spacing: 2px;">
   <span style="font-size: 15px;"><br/></span>
</p>
<p style="text-align: center;padding: 0px 0.5em;">
   <span style="font-size: 15px;letter-spacing: 2px;text-align: justify;"></span>
</p>
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   <section class="_editor" data-id="92359" data-color="#ffe750" data-width="100%" style="margin-right: auto; margin-left: auto; font-variant-numeric: normal; font-variant-east-asian: normal; width: 100%;">
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                        <section style="width: 25px;height: 25px;transform: rotate(-45deg);">
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                                 <br/>
                           </section>
                           <section style="margin-top: -14px;margin-right: auto;margin-left: auto;width: 4px;height: 25px;border-radius: 4px;background-color: #333333;">
                                 <br/>
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                        <section data-width="100%" style="width: 100%; text-align: center; color: #fefefe; letter-spacing: 6px; font-size: 18px;">
                           <p style="font-family: Optima-Regular, PingFangTC-light;">
                                 <br/>
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   <br/>
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                        完
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</section>

LikeLoot 发表于 2024-3-2 23:56:07

解惑了

无极神话 发表于 2024-3-20 08:13:51

学习啦，谢谢楼主

Reverse 发表于 2024-4-6 17:23:25

简卡只要求第一次傍紧后松，之前一直有疑惑，现在理解了

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机务在线's Archiver

机轮安装程序中“松开轴螺母到几乎为零的力矩”