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曲軸的受力分析

2014-07-28 18:42 作者:管理員9 來源:未知 瀏覽: 字號:

摘要:1)連桿軸頸 連桿軸頸一般受到連桿力的作用。在活塞式壓縮機及內然機上,連桿力包括活塞所受的氣體壓力和活塞連桿組往復運動,由于質量引起的慣性力。連桿力是周期性變化。在連桿軸頸上,還有連桿的旋轉質且部分引起的慣性力,以及連桿軸頸質量引起的旋轉慣性

    1)連桿軸頸 連桿軸頸一般受到連桿力的作用。在活塞式壓縮機及內然機上,連桿力包括活塞所受的氣體壓力和活塞連桿組往復運動,由于質量引起的慣性力。連桿力是周期性變化。在連桿軸頸上,還有連桿的旋轉質且部分引起的慣性力,以及連桿軸頸質量引起的旋轉慣性力。這些力的大小和方向不變。作用于連桿上的這些力,在曲拐平面及垂直于曲拐平面的分力,分別用集中力P和S表示,如圖12.7-6所示。
    2)曲柄臂 在曲柄臂上自身及裝在曲柄骨上的平衡塊引起的旋轉慣性力。這些慣性力在兩個曲柄臂上分別用Q及C表示(E9 12.7-6)。
    3)主軸頸 在主軸頸上,作用有輸入轉矩T及阻力轉矩(T+S·R)(在某些情況下,它又是輸出轉矩)。對于多拐曲軸,在主軸頸上還作用有彎矩。這些彎矩是由下述情況引起的:鄰近曲拐受載荷的作用,曲軸箱的變形,主軸承座的彈性變形,以及主軸承加工不同軸,過量磨損等。它們在曲拐平面及垂直于曲拐平面內的分量分別用m1,mr及M1,Mr表示。
在主軸頸上,還作用有支承反力,它們在曲拐平面及垂直于曲拐平面內的分力分別用r1,rr及R1,Rr表示(圖12.7-6)。
曲軸受力圖
(責任編輯:laugh521521)
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