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滾動螺旋傳動的預緊

2014-09-17 10:15 作者:管理員11 來源:未知 瀏覽: 字號:

摘要:預緊 為了消除滾動螺旋副的間隙,提高傳動的定位精 度、重復定位精度和軸向剛度,常采用雙螺母預緊 (圖7.2-10)。雙螺母預緊后,受預載軸向載荷Fa0的 作用,螺母產生的軸向壓縮變形量為a0受外加的 工作載荷F后,工作螺母的軸向變形最增加△,而 預緊螺母的軸向

預緊
    為了消除滾動螺旋副的間隙,提高傳動的定位精
度、重復定位精度和軸向剛度,常采用雙螺母預緊
(圖7.2-10)。雙螺母預緊后,受預載軸向載荷Fa0的
作用,螺母產生的軸向壓縮變形量為δa0受外加的
工作載荷F后,工作螺母的軸向變形最增加△δ,而
預緊螺母的軸向變形量相應地減小△δ,其變形量和
受力可由圖7.2-11表示。預載后的螺旋在工作載荷
作用是應保證不出現間隙,其臨界條件是

雙螺母預緊
預緊螺母的變形和力關系
(責任編輯:laugh521521)
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