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| 76 | +<div class="markdown-body" id="postBody"><p>摩托车的牙盘齿比，也就是前后的齿轮比，是影响摩托车性能的关键因素之一，它直接决定了摩托车的加速能力、最高速度以及燃油效率。理解并调整牙盘齿比，可以让骑行者根据不同的驾驶需求和路况，优化摩托车的表现。</p> |
| 77 | +<p>牙盘齿比由前齿轮（通常位于发动机输出轴上）和后齿轮（通常位于后轮的驱动轴上）的齿数比决定。例如，如果前齿轮有15个齿，后齿轮有45个齿，那么齿比就是15:45，简化后为1:3。</p> |
| 78 | +<p>较高的齿比（前齿轮齿数较少，后齿轮齿数较多）会增加低速时的扭矩，从而提高加速能力。这在需要频繁加速和减速的城市驾驶中特别有用。<br> |
| 79 | +<a target="_blank" rel="noopener noreferrer nofollow" href="https://raw.githubusercontent.com/algo-scope/imgBed/main/2411/202412090816304.png"><img src="https://raw.githubusercontent.com/algo-scope/imgBed/main/2411/202412090816304.png" alt="image.png" style="max-width: 100%;"></a></p> |
| 80 | +<p>较低的齿比（前齿轮齿数较多，后齿轮齿数较少）会减少扭矩但增加速度，因此有利于在高速公路或长直道上达到更高的速度。发动机转同样的圈数，后轮转的圈数更多，相同转速下速度更快。<br> |
| 81 | +<a target="_blank" rel="noopener noreferrer nofollow" href="https://raw.githubusercontent.com/algo-scope/imgBed/main/2411/202412090817473.png"><img src="https://raw.githubusercontent.com/algo-scope/imgBed/main/2411/202412090817473.png" alt="image.png" style="max-width: 100%;"></a></p> |
| 82 | +<p>典型的是国内引进的是ninja400，14-35的齿轮比，而泰国原版是15-41，齿比更大，很多人反映说国内版低扭差，加速没力，换过泰版41牙盘以后有很大提升。</p> |
| 83 | +<p>升仕703RR齿比为16:42，而703F是16:48，春风675SR是16:48。</p> |
| 84 | +<p>齿比体现的是末级传动比，也就是从发动机小链轮到后压盘的传动比。</p> |
| 85 | +<p>但是，不能直接按照齿比来算速度，因为发动机连接变速箱还有一个初级传动比，每一档变速箱还有个变速齿比。<br> |
| 86 | +<a target="_blank" rel="noopener noreferrer nofollow" href="https://raw.githubusercontent.com/algo-scope/imgBed/main/2411/202412090844810.png"><img src="https://raw.githubusercontent.com/algo-scope/imgBed/main/2411/202412090844810.png" alt="image.png" style="max-width: 100%;"></a></p> |
| 87 | +<p>升仕703F和春风675SR的说明书：<br> |
| 88 | +<a target="_blank" rel="noopener noreferrer nofollow" href="https://raw.githubusercontent.com/algo-scope/imgBed/main/2411/202412090828195.png"><img src="https://raw.githubusercontent.com/algo-scope/imgBed/main/2411/202412090828195.png" alt="image.png" style="max-width: 100%;"></a></p> |
| 89 | +<p>根据齿轮比计算出的六档极速：<br> |
| 90 | +<a target="_blank" rel="noopener noreferrer nofollow" href="https://raw.githubusercontent.com/algo-scope/imgBed/main/2411/202412090839021.png"><img src="https://raw.githubusercontent.com/algo-scope/imgBed/main/2411/202412090839021.png" alt="image.png" style="max-width: 100%;"></a></p> |
| 91 | +<p>计算方式：<br> |
| 92 | +严格来讲，按照定义，齿轮比应该叫传动比，是指两个相互啮合的齿轮的齿数之比。它表示输入齿轮（主动齿轮）和输出齿轮（从动齿轮）的转速之间的关系。也就是<br> |
| 93 | +$$齿轮比=\frac{主动轮转速}{从动轮转速}=\frac{从动轮齿数}{主动轮齿数}$$<br> |
| 94 | +$$小飞轮转速=\frac{发动机转速}{主减速比\times变速箱齿比}$$<br> |
| 95 | +$$最终减速比=\frac{后牙盘}{小飞轮}$$<br> |
| 96 | +$$轮胎转速=\frac{小飞轮转速}{最终减速比}$$<br> |
| 97 | +$$速度=轮胎转速\times轮胎周长$$<br> |
| 98 | +以上只是理论计算，实际情况下由于空气阻力、传动效率等影响因素，发动机提供的扭矩不一定能达到理论极速需要的那么大。如果没有阻力影响，一台跟703RR同样传动设计的单缸125，假设在6档能达到12300转，那么也能实现256km/h的极速，想想就知道这根本不现实。所以一般来说，大排量、大扭矩、高压缩比的车更容易实现理论极速。</p> |
| 99 | +<h2>References</h2> |
| 100 | +<ol> |
| 101 | +<li><a href="https://www.58moto.com/article/undefined/10442478.html" rel="nofollow">https://www.58moto.com/article/undefined/10442478.html</a></li> |
| 102 | +<li><a href="https://www.dongchedi.com/video/7420828839980302898" rel="nofollow">https://www.dongchedi.com/video/7420828839980302898</a></li> |
| 103 | +</ol></div> |
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