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    挖掘机伸缩臂,挖掘机加长臂,挖掘机打桩机,挖掘机液压剪,济南槐荫通达工程机械厂挖掘机加长臂轴和轴承的公差配合

    在通常情况下轴承的外圈和结构件之间为中型压入配合轴承的内圈和轴为基孔制的间隙配合轴承的内圈开有油槽加润滑脂润滑轴和轴承的配合间隙过大则存在较大的冲击载荷严重影响轴和结构件的使用寿命轴和轴承的配合间隙过小则难以形成稳定的润滑膜所以轴和轴承之间的间隙在保证能形成稳定的润滑膜的基础上应尽可能的小其最小值可通过下面公式理论技术

    󣫣?#20445;bᣚebᣲ̣̣ģ?/P>

    油膜厚度最小安全值

    ?#20445;?#36724;承两端面的相对挠曲变形量

    ң?#20445;?#36724;的表面粗糙度

    ңᣲ轴承的表面粗糙度

    ̣轴在轴承内一段的直线度

    ģ轴承内圈的圆度

    装配后轴承内孔收缩量

    现就徐工̣ã型挖掘机动臂和斗杆连接处的轴和轴承做最小配合间隙的计算

    当直轴径为的轴的油膜厚度最小安全值󣽣̣对轴做挠度分析其中液压系统的系统压力为?#24120;保础保У?#27833;缸的缸径为?#20445;?/P>

    油缸的推力为ƣ?#23567;PPe常保础保浮保Σ?/P>

    根据斗杆受力分析У죽У?#24120;e?#21017;ң죽ң?#24120;保?/P>

    轴的受力图可简化为

    轴的载荷?#35782;Գ品?#24067;?#20540;保?#22312;时弯矩方程为

    ͣңأأ?#24120;Pأ常P?#21017;

    ٣أģ

    ã

    由أ٣得ģأȣ得㣽

    所以٣أ

    式中ţǣУᣩ

    ɣģ?#20445;保保P?/P>

    ?#24120;PP保P?/P>

    ٣?#20445;PE保?/P>

    所以?#20445;٣保P٣常P?/P>

    ?#20445;?/P>

    轴的表面粗糙度如ң?#20445;保̣?/P>

    轴承的表面粗糙度ңᣲ?#20445;?

    轴在轴承内一段的直线度̣

    轴承内圈的圆度ģ?#20445;w?/P>

    装配后轴承内孔最大收缩量

    ?#21147;ģ?/P>

    式中ģ为轴承外径最大过盈量ģ̣

    ģ为压入前轴承外径ģ£?#20445;保?/P>

    为压入前轴承内径䣰

    经计算̣

    所以形成油膜最小间隙为

    󣫣?#20445;b保bᣲ̣ģ?/P>

    ?#20445;保保保?/P>

    ̣

    而所选公差为其最小间隙为?#20445;̣?#21363;可见此间隙是合适的

    挖掘机加长臂轴和轴承的公差配合


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