1、保(bao)證汽(qi)(qi)車(che)平(ping)穩(wen)起(qi)(qi)(qi)步(bu)(bu) 這是(shi)離(li)(li)(li)合器(qi)的首(shou)要功能。在(zai)汽(qi)(qi)車(che)起(qi)(qi)(qi)步(bu)(bu)前,自然(ran)要先起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)發(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)。而汽(qi)(qi)車(che)起(qi)(qi)(qi)步(bu)(bu)時(shi),汽(qi)(qi)車(che)是(shi)從完全靜(jing)止(zhi)的狀(zhuang)態逐(zhu)步(bu)(bu)加(jia)(jia)速(su)的。如果傳動(dong)(dong)(dong)(dong)(dong)(dong)系(xi)(xi)(它聯系(xi)(xi)著整個汽(qi)(qi)車(che))與發(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)剛性地(di)聯系(xi)(xi),則變速(su)器(qi)一掛上檔(dang),汽(qi)(qi)車(che)將(jiang)突(tu)然(ran)向前沖(chong)一下(xia)(xia)(xia),但并不(bu)能起(qi)(qi)(qi)步(bu)(bu)。這是(shi)因為汽(qi)(qi)車(che)從靜(jing)止(zhi)到(dao)前沖(chong)時(shi),產(chan)生很大(da)慣性力(li)(li),對發(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)造成(cheng)很大(da)地(di)阻(zu)(zu)力(li)(li)矩。在(zai)這慣性阻(zu)(zu)力(li)(li)矩作(zuo)用下(xia)(xia)(xia),發(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)在(zai)瞬時(shi)間轉(zhuan)(zhuan)速(su)急劇下(xia)(xia)(xia)降到(dao)最低(di)穩(wen)定(ding)(ding)轉(zhuan)(zhuan)速(su)(一般300-500RPM)以下(xia)(xia)(xia),發(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)即熄火(huo)而不(bu)能工作(zuo),當(dang)然(ran)汽(qi)(qi)車(che)也不(bu)能起(qi)(qi)(qi)步(bu)(bu)。 因此,我(wo)們就(jiu)需要離(li)(li)(li)合器(qi)的幫助了。在(zai)發(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)起(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)后,汽(qi)(qi)車(che)起(qi)(qi)(qi)步(bu)(bu)之前,駕駛員先踩下(xia)(xia)(xia)離(li)(li)(li)合器(qi)踏板,將(jiang)離(li)(li)(li)合器(qi)分離(li)(li)(li),使發(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)和傳動(dong)(dong)(dong)(dong)(dong)(dong)系(xi)(xi)脫(tuo)開(kai),再將(jiang)變速(su)器(qi)掛上檔(dang),然(ran)后逐(zhu)漸(jian)(jian)松開(kai)離(li)(li)(li)合器(qi)踏板,使離(li)(li)(li)合器(qi)逐(zhu)漸(jian)(jian)接合。在(zai)接合過程中,發(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)所受阻(zu)(zu)力(li)(li)矩逐(zhu)漸(jian)(jian)增大(da),故應同(tong)時(shi)逐(zhu)漸(jian)(jian)踩下(xia)(xia)(xia)加(jia)(jia)速(su)踏板,即逐(zhu)步(bu)(bu)增加(jia)(jia)對發(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)的燃料(liao)供給量,使發(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)的轉(zhuan)(zhuan)速(su)始終保(bao)持在(zai)最低(di)穩(wen)定(ding)(ding)轉(zhuan)(zhuan)速(su)上,而不(bu)致熄火(huo)。同(tong)時(shi),由(you)于離(li)(li)(li)合器(qi)的接合緊密程度逐(zhu)漸(jian)(jian)增大(da),發(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)經傳動(dong)(dong)(dong)(dong)(dong)(dong)系(xi)(xi)傳給驅(qu)動(dong)(dong)(dong)(dong)(dong)(dong)車(che)輪(lun)的轉(zhuan)(zhuan)矩便逐(zhu)漸(jian)(jian)增加(jia)(jia),到(dao)牽引力(li)(li)足(zu)以克服起(qi)(qi)(qi)步(bu)(bu)阻(zu)(zu)力(li)(li)時(shi),汽(qi)(qi)車(che)即從靜(jing)止(zhi)開(kai)始運動(dong)(dong)(dong)(dong)(dong)(dong)并逐(zhu)步(bu)(bu)加(jia)(jia)速(su)
2、保證(zheng)傳(chuan)動(dong)系換(huan)(huan)(huan)檔(dang)時(shi)工(gong)作平順(shun) 2:實現平順(shun)的(de)換(huan)(huan)(huan)檔(dang) 在汽車行(xing)駛過程中,為(wei)適應不斷變化(hua)的(de)行(xing)駛條件,傳(chuan)動(dong)系經常要更(geng)換(huan)(huan)(huan)不同(tong)(tong)檔(dang)位(wei)(wei)工(gong)作。實現齒(chi)輪式變速器(qi)的(de)換(huan)(huan)(huan)檔(dang),一(yi)般是撥動(dong)齒(chi)輪或其他掛檔(dang)機(ji)構,使(shi)(shi)原(yuan)用檔(dang)位(wei)(wei)的(de)某一(yi)齒(chi)輪副(fu)推出(chu)傳(chuan)動(dong),再使(shi)(shi)另一(yi)檔(dang)位(wei)(wei)的(de)齒(chi)輪副(fu)進(jin)入工(gong)作。在換(huan)(huan)(huan)檔(dang)前必須踩下離合(he)(he)器(qi)踏板,中斷動(dong)力傳(chuan)動(dong),便(bian)于(yu)使(shi)(shi)原(yuan)檔(dang)位(wei)(wei)的(de)嚙合(he)(he)副(fu)脫開,同(tong)(tong)時(shi)使(shi)(shi)新檔(dang)位(wei)(wei)嚙合(he)(he)副(fu)的(de)嚙合(he)(he)部位(wei)(wei)的(de)速度逐步(bu)趨(qu)向同(tong)(tong)步(bu),這樣進(jin)入嚙合(he)(he)時(shi)的(de)沖擊可以大(da)大(da)的(de)減小,實現平順(shun)的(de)換(huan)(huan)(huan)檔(dang)。
3、防止(zhi)傳(chuan)(chuan)動(dong)(dong)(dong)系(xi)過(guo)載(zai) 當汽車進行緊急(ji)制(zhi)(zhi)動(dong)(dong)(dong)時,若沒有離(li)合(he)(he)(he)器,則發(fa)動(dong)(dong)(dong)機(ji)(ji)將(jiang)因和傳(chuan)(chuan)動(dong)(dong)(dong)系(xi)剛(gang)性連接而急(ji)劇降低轉速,因而其中(zhong)所有運動(dong)(dong)(dong)件將(jiang)產生(sheng)很大的(de)(de)慣性力矩(ju)(其數(shu)值可(ke)能大大超過(guo)發(fa)動(dong)(dong)(dong)機(ji)(ji)正常工(gong)作時所發(fa)出(chu)的(de)(de)最大扭(niu)距),對傳(chuan)(chuan)動(dong)(dong)(dong)系(xi)造成超過(guo)其承載(zai)能力的(de)(de)載(zai)荷,而使(shi)機(ji)(ji)件損壞。有了離(li)合(he)(he)(he)器,便可(ke)以(yi)依靠離(li)合(he)(he)(he)器主動(dong)(dong)(dong)部(bu)分和從動(dong)(dong)(dong)部(bu)分之間可(ke)能產生(sheng)的(de)(de)相對運動(dong)(dong)(dong)以(yi)消除這(zhe)一危(wei)險。因此,我們需要離(li)合(he)(he)(he)器來限制(zhi)(zhi)傳(chuan)(chuan)動(dong)(dong)(dong)系(xi)所承受(shou)的(de)(de)最大扭(niu)距,保證(zheng)安全(quan)。 離(li)合(he)(he)(he)器可(ke)分為:摩擦離(li)合(he)(he)(he)器,或(huo)是(shi)利用(yong)液體作為傳(chuan)(chuan)動(dong)(dong)(dong)的(de)(de)介質(zhi)(即(ji)液力偶(ou)合(he)(he)(he)器),或(huo)是(shi)利用(yong)磁力傳(chuan)(chuan)動(dong)(dong)(dong)(即(ji)電磁離(li)合(he)(he)(he)器}
離合器撥叉是汽車變速箱的一部分,屬于變速箱附件,主要用于離合器換擋。與變速手柄連接,位于手柄下端,撥動中間變速輪改變輸入輸出速比。撥叉一般是指手動變速箱的汽車,位于變速箱和發動機之間的離合器系統中。
踏板通過傳動系統將力傳遞給撥叉,撥叉推動分離軸承壓下離合器壓盤,將發動機和變速箱之間的動力傳遞分離。離合器接合時,踏板處于最高位置,分離桿和分離軸承之間有間隙δ。壓盤在壓緊彈簧的作用下壓緊從動盤,發動機的扭矩通過飛輪和壓盤傳遞到從動盤,再傳遞到變速器的第一軸。
離合器傳遞的最大扭矩取決于從動盤摩擦面的最大靜摩擦力。它與摩擦表面之間的壓力、摩擦面積和摩擦材料的性能有關。對于具有一定結構的離合器,其最大靜摩擦力是一個固定值。如果傳動系統傳遞的扭矩超過這個固定值,離合器就會打滑,從而起到過載保護的作用。
外形與(yu)動力方面的(de)參數如(ru)上表(biao)所(suo)示(shi),由(you)于(yu)此次(ci)將(jiang)在國內上市(shi)的(de)車型沿用了(le)北美的第(di)四(si)代(而(er)非年初在底特律車(che)展亮相的采用全新平臺的第五代(dai)2008款道奇Caravan車(che)型(xing)),因此相對老舊(jiu)平臺帶(dai)來的發動機以及(ji)變速箱的(de)相對陳舊可說是(shi)此次進入國(guo)內(nei)車型的(de)最(zui)大遺憾(han)。不過實際上與之互為競爭關系的(de)GL8在北美已經是(shi)停產(chan)車型,同(tong)樣(yang)的(de)軟肋也(ye)存(cun)在于對手(shou)身上。
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