倒鏈的工作原理

    倒鏈的工作原理

    當提升重物時，手拉鏈使鍵輪按順時針方向轉動，鏈輪沿著圓盤套筒上的螺紋向裏移動。而將棘輪和摩擦片都壓緊在鏈輪軸上（鏈輪軸與圓盤牢固形成一體），棘輪圈隻能順時針方向轉動
，棘爪在棘輪圈上跳動發出嘻嘻之聲

，鏈輪右端的齒輪帶動齒輪（也稱行星齒輪）與(yu)固(gu)定(ding)圈(quan)相(xiang)齧(nie)合(he)，使(shi)齒(chi)輪(lun)沿(yan)著(zhe)鏈(lian)輪(lun)軸(zhou)為(wei)中(zhong)心(xin)順(shun)時(shi)針(zhen)方(fang)向(xiang)轉(zhuan)動(dong)
，同(tong)時(shi)帶(dai)動(dong)驅(qu)動(dong)機(ji)構(gou)和(he)起(qi)重(zhong)鏈(lian)輪(lun)轉(zhuan)動(dong)，使(shi)起(qi)重(zhong)鏈(lian)子(zi)上(shang)升(sheng)，當(dang)不(bu)拉(la)手(shou)拉(la)鏈(lian)之(zhi)後(hou)，重(zhong)物(wu)是(shi)靠(kao)自(zi)重(zhong)產(chan)生(sheng)的(de)自(zi)鎖(suo)現(xian)象(xiang)和(he)棘(ji)爪(zhao)阻(zu)止(zhi)棘(ji)輪(lun)圈(quan)逆(ni)時(shi)針(zhen)方(fang)向(xiang)轉(zhuan)動(dong)而(er)停(ting)止(zhi)在(zai)空(kong)中(zhong)。反(fan)之(zhi)，當(dang)鬆(song)下(xia)重(zhong)物(wu)時(shi)，手(shou)拉(la)鏈(lian)使(shi)鏈(lian)輪(lun)按(an)逆(ni)時(shi)針(zhen)方(fang)向(xiang)轉(zhuan)動(dong)
，鏈(lian)條(tiao)沿(yan)著(zhe)圓(yuan)盤(pan)套(tao)筒(tong)上(shang)的(de)螺(luo)紋(wen)向(xiang)外(wai)移(yi)動(dong)，而(er)將(jiang)棘(ji)圈(quan)摩(mo)擦(ca)片(pian)和(he)圓(yuan)盤(pan)套(tao)筒(tong)分(fen)離(li)，則(ze)鏈(lian)輪(lun)軸(zhou)右(you)端(duan)的(de)齒(chi)輪(lun)、帶(dai)動(dong)齒(chi)輪(lun)與(yu)固(gu)定(ding)齒(chi)輪(lun)相(xiang)齧(nie)合(he)，使(shi)齒(chi)輪(lun)沿(yan)鏈(lian)軸(zhou)為(wei)中(zhong)心(xin)逆(ni)時(shi)針(zhen)方(fang)向(xiang)轉(zhuan)動(dong)，同(tong)時(shi)帶(dai)動(dong)驅(qu)動(dong)機(ji)構(gou)和(he)起(qi)重(zhong)鏈(lian)輪(lun)轉(zhuan)動(dong)，使(shi)起(qi)重(zhong)鏈(lian)子(zi)下(xia)降(jiang)，當(dang)不(bu)拉(la)手(shou)拉(la)鏈(lian)之(zhi)後(hou)，因(yin)鏈(lian)輪(lun)停(ting)止(zhi)轉(zhuan)動(dong)時(shi)，起(qi)重(zhong)鏈(lian)輪(lun)傳(chuan)動(dong)機(ji)構(gou)同(tong)樣(yang)沿(yan)著(zhe)逆(ni)時(shi)針(zhen)方(fang)向(xiang)繼(ji)續(xu)轉(zhuan)動(dong)，使(shi)圓(yuan)盤(pan)摩(mo)擦(ca)片(pian)及(ji)棘(ji)圈(quan)相(xiang)互(hu)之(zhi)間(jian)互(hu)相(xiang)壓(ya)緊(jin)而(er)產(chan)生(sheng)摩(mo)擦(ca)力(li)，棘(ji)輪(lun)圈(quan)受(shou)棘(ji)爪(zhao)阻(zu)止(zhi)不(bu)能(neng)向(xiang)逆(ni)時(shi)針(zhen)方(fang)向(xiang)轉(zhuan)動(dong)，於(yu)是(shi)摩(mo)擦(ca)力(li)作(zuo)用(yong)在(zai)螺(luo)紋(wen)上(shang)產(chan)生(sheng)自(zi)鎖(suo)

，使(shi)重(zhong)物(wu)停(ting)止(zhi)在(zai)空(kong)中(zhong)。