手赚导航

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索式提取器則卡腳的尖頂將與齒根接觸

發布時間:2016-12-16 08:51:00 點擊:

當設計和檢驗齒輪時,常需要知道某圓周上的齒厚,例如,索式提取器手赚导航為了檢驗輪齒齒 頂的強度就需要計算出齒頂圓上的齒厚;為了確定齒側間隙就需要計算出節圓 上的齒厚等。圖 +,- 所示為漸開線齒輪的一個輪齒,圖中 #) 表示任意半徑 *) 圓 上的齒厚,!) 、#) 分別為該圓上的壓力角和漸開線展角。 #、*、! 及#分別表示分 度圓的齒厚、半徑、壓力角和漸開線展角。由圖 +,- 可得 $ !"+,+ . ’"+,- ! # * . ’(#) .#)! # * . ’(/&0!) . /&0!) 故 #) ! *$) ! #*) * . ’*) ( /&0!) . /&0!) (+,1) 式中 !) ! 23##$% *" *) 由式(+,1)可計算出任意圓上的齒厚,如齒頂圓、節圓和基圓上的齒厚等。 另外在加工齒輪和檢驗齒輪時,通常要測量公法線長度,依此來判斷齒輪加 工精度。如圖 +,1 所示,用公法線長度卡尺的兩個卡腳跨過三個齒,兩卡腳分別 與兩齒廓相切于 .、+ 兩點。距離 .+ 稱為公法線長度,用 /4 表示,則 /4 ! .+。 顯然線段 .+ 為漸開線齒廓的發生線,由漸開線的性質可知:/4 ! .+ ! (4 . ()!" ) #" ,若所跨齒數為 0,則上式為 /0 ! .+ !( 0 . ()!" ) #" (+,5) 式中 !" 、#" 分別為基圓上的齒距和齒厚。將其值代入式(+,5)可


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