骑变速车上坡时用大齿轮还是小齿轮省力

2025-01-22 08:00:16
推荐回答(4个)
回答1:

大齿轮省力。

链条提供给后轮的是动力力矩,当用大轮的时候,力矩更大,这样就会更省力,但这样速度就降下来了,所以上坡的时候应该前小轮,后大轮。下坡则相反。

后轮较大, 前轮选较小的,因为做的功不变,由于W=FS 想要省,,就要延长距离,这个原百理与动滑轮(滑轮组)和斜坡与杠杆是一样的。

大齿轮,从力copy学角度,骑自行车(匀速时)满足下面等式

f×R=F×r(力矩平衡);

f是地面与车轮的摩擦力,R是车轮半径,F是蹬自行车用的力,r是齿轮半径。

在同一路面,f、R都不变,故r越大,F越小越省力zd。

扩展资料:

大齿轮一般安装在窑中或靠近窑尾。这是为了减小筒体的扭矩,减小筒体对传动装置的热作用,以及减小两端粉尘的浸袭。大齿轮距轮带的合适距离约3米,因靠近轮带筒体不易弯曲,容易保证大小齿轮的正确啮合,距离过小则不便于安装和检修。

一般是用10~12条厚20~30毫米的弹性钢板,一端铆接在筒体的切线方向上,另一端用螺钉固定在齿轮的突缘上,相互之间并成等距离布置。这种安装的优点是具有一定弹性,有利于窑衬的耐久性和大小齿轮的啮合质量。其缺点是安装较困难,当大齿轮轮齿一面磨损后不能调面使用,由于齿轮内面具有突缘不便于制造,随着窑体直径的增大,更显得突出。故一般常用在中小型的窑上。

参考资料来源:百度百科-大齿轮

回答2:

楼主你好 我看了你的提问 感觉你可能是混淆了前后齿轮 没听明白老师说的话 上坡时前齿轮小 后齿轮大省力 前齿轮大 后齿轮小费力 我们首先分析后齿轮 假设前齿轮不变 后齿轮变大 我们知道自行车后齿轮转一圈 车轮一定转一圈 前齿轮靠脚蹬踏转动 如果后齿轮大到和前齿轮一样大 那么我们登一个圈后轮也就转一个圈 如果后齿轮小 我们只要等半个圈后面就转一个圈 如果车轮转个一圈 上面两个运动距离一个长一个短 那个会比较费力你对比一下就知道 在换个角度 你把胳膊收回 然后打出一拳 打出了50牛的力 你在把胳膊办伸 在打出50牛的力 你对比一下 距离短了 想打出同样的效果 你要比以前多费多少力

回答3:

肯定是大齿轮省力,这里的大齿轮是跟后轮固定在一起的那个齿轮,这个齿轮转一圈,轮胎就转一圈。因为脚蹬的齿轮是一定的,那么脚蹬转一圈,大齿轮的话转的圈数少,因此轮胎的圈数就少,这样的话前进的距离就少,那么做的功就少一些,如果你踩踏板的圈数是一定的话,显然这样做的功少一些,也就会省力些,但是需要蹬更多圈来爬坡,因此时间会更长些,希望对你有用。

回答4:

小齿轮绝对省力 杠杆原理就可以解释 但因为大齿轮转的圈数少 所以省功 但不是省力

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