齿轮传动的传动比 指主动轮与从动轮的什么之比 与齿数成什么比 用公式表示为 什么?
麻烦各位给上面的题目一答案
推荐回答(4个)
指主动轮与从动轮的角速度之比。
构件a和构件b的传动比为i=ωa/ ωb=na/nb,式中ωa和 ωb分别为构件a和b的角速度(弧度/秒);na和nb分别为构件a和b的转速(转/分)。
传动比还可用a和b轮的齿数Za和Zb表示,i=Zb/Za;对于摩擦传动,传动比可用a和b轮的直径Da和Db表示,i=Db/Da。

扩展资料:
齿轮工作时有以下情况出现会导致失效:
1、齿面磨损
对于开式齿轮传动或含有不清洁的润滑油的闭式齿轮传动,由于啮合齿面间的相对滑动,使一些较硬的磨粒进入了摩擦表面,从而使齿廓改变,侧隙加大,以至于齿轮过度减薄导致齿断。
2、齿面胶合
对于高速重载的齿轮传动中,因齿面间的摩擦力较大,相对速度大,致使啮合区温度过高,一旦润滑条件不良,齿面间的油膜便会消失,使得两轮齿的金属表面直接接触,从而发生相互粘结。
3、疲劳点蚀
相互啮合的两轮齿接触时,齿面间的作用力和反作用力使两工作表面上产生接触应力,由于啮合点的位置是变化的,且齿轮做的是周期性的运动,所以接触应力是按脉动循环变化的。
齿面长时间在这种交变接触应力作用下,在齿面的刀痕处会出现小的裂纹,随着时间的推移,这种裂纹逐渐在表层横向扩展,裂纹形成环状后,使轮齿的表面产生微小面积的剥落而形成一些疲劳浅坑。
参考资料来源:百度百科-传动比
楼上的也吹的太厉害了吧!齿轮传动,传动比是主动齿轮与从动齿轮角速度(或转速)的比值,也等于两齿轮齿数的反比。即
i=n1/n2=z2/z1。n1主动齿轮转速
n2从动齿轮转速
z1主动齿轮齿数
z2从动齿轮齿数
一般圆柱齿轮副传动比i小于或等于8,圆锥齿轮传动比i小于或等于5。
这里涉及2个问题:1)是哪一个对哪一个的比?2)是瞬时传动比还是平均传动比?
1)这一问题属于传动比的定义问题。为了指明是哪一个对哪一个的传动比,通常在传动比符号右下角用右下标12表示,即是指齿轮1对齿轮2的转速比。
2)这一问题属于传动比的计算方法问题。若根据定义,可通过同一时间内两轮的转角比来计算,即 齿轮1对齿轮2的传动比=齿轮1的转角:齿轮2的转角,这一方法既适合于瞬时传动比的计算也适合平均传动比的计算。
事实上,齿轮传动会因为制造与装配误差、齿廓的磨损、单双齿啮合的变刚度激励等冲击使得瞬时传动比沿着理论值而波动。
为了计算的简便,平时一般采用齿数比来计算平均传动比,即理论传动比,这样
齿轮1对齿轮2的传动比=齿轮1的转速:齿轮2的转速=齿轮2的齿数:齿轮1的齿数。
齿轮传动比等于主动齿轮与被动齿轮的齿数比,也等于被动齿轮与主动齿轮的转速之比 ,用公式表示:i=Z1/Z2=n2/n1
有什么问题和想法,欢迎您有时间光临百度(机械工程)我是机械工程吧吧主
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