1、保(bao)證汽車(che)(che)平穩(wen)起(qi)步(bu)(bu)(bu) 這(zhe)是離合(he)(he)器(qi)的首要(yao)功能。在(zai)(zai)(zai)汽車(che)(che)起(qi)步(bu)(bu)(bu)前(qian),自然(ran)要(yao)先起(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)發(fa)(fa)(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)。而汽車(che)(che)起(qi)步(bu)(bu)(bu)時,汽車(che)(che)是從完(wan)全靜(jing)止(zhi)的狀態(tai)逐(zhu)步(bu)(bu)(bu)加(jia)速(su)的。如果(guo)傳動(dong)(dong)(dong)(dong)(dong)(dong)(dong)系(xi)(xi)(它聯(lian)系(xi)(xi)著整個汽車(che)(che))與發(fa)(fa)(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)剛性(xing)地聯(lian)系(xi)(xi),則(ze)變速(su)器(qi)一掛上(shang)檔,汽車(che)(che)將突然(ran)向前(qian)沖一下(xia)(xia),但并不(bu)能起(qi)步(bu)(bu)(bu)。這(zhe)是因為汽車(che)(che)從靜(jing)止(zhi)到前(qian)沖時,產生很大慣性(xing)力(li)(li)(li),對發(fa)(fa)(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)造成很大地阻(zu)力(li)(li)(li)矩。在(zai)(zai)(zai)這(zhe)慣性(xing)阻(zu)力(li)(li)(li)矩作用下(xia)(xia),發(fa)(fa)(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)在(zai)(zai)(zai)瞬時間轉速(su)急(ji)劇下(xia)(xia)降到最低(di)穩(wen)定轉速(su)(一般300-500RPM)以(yi)下(xia)(xia),發(fa)(fa)(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)即熄火而不(bu)能工作,當然(ran)汽車(che)(che)也不(bu)能起(qi)步(bu)(bu)(bu)。 因此,我們就需要(yao)離合(he)(he)器(qi)的幫助了。在(zai)(zai)(zai)發(fa)(fa)(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)起(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)后,汽車(che)(che)起(qi)步(bu)(bu)(bu)之前(qian),駕駛員(yuan)先踩下(xia)(xia)離合(he)(he)器(qi)踏板,將離合(he)(he)器(qi)分離,使發(fa)(fa)(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)和傳動(dong)(dong)(dong)(dong)(dong)(dong)(dong)系(xi)(xi)脫開(kai),再(zai)將變速(su)器(qi)掛上(shang)檔,然(ran)后逐(zhu)漸(jian)(jian)松開(kai)離合(he)(he)器(qi)踏板,使離合(he)(he)器(qi)逐(zhu)漸(jian)(jian)接(jie)(jie)合(he)(he)。在(zai)(zai)(zai)接(jie)(jie)合(he)(he)過程(cheng)中,發(fa)(fa)(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)所受阻(zu)力(li)(li)(li)矩逐(zhu)漸(jian)(jian)增大,故應同時逐(zhu)漸(jian)(jian)踩下(xia)(xia)加(jia)速(su)踏板,即逐(zhu)步(bu)(bu)(bu)增加(jia)對發(fa)(fa)(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)的燃(ran)料供給(gei)量,使發(fa)(fa)(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)的轉速(su)始終保(bao)持(chi)在(zai)(zai)(zai)最低(di)穩(wen)定轉速(su)上(shang),而不(bu)致熄火。同時,由于離合(he)(he)器(qi)的接(jie)(jie)合(he)(he)緊密(mi)程(cheng)度逐(zhu)漸(jian)(jian)增大,發(fa)(fa)(fa)(fa)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)經傳動(dong)(dong)(dong)(dong)(dong)(dong)(dong)系(xi)(xi)傳給(gei)驅動(dong)(dong)(dong)(dong)(dong)(dong)(dong)車(che)(che)輪的轉矩便逐(zhu)漸(jian)(jian)增加(jia),到牽引力(li)(li)(li)足以(yi)克服起(qi)步(bu)(bu)(bu)阻(zu)力(li)(li)(li)時,汽車(che)(che)即從靜(jing)止(zhi)開(kai)始運動(dong)(dong)(dong)(dong)(dong)(dong)(dong)并逐(zhu)步(bu)(bu)(bu)加(jia)速(su)
2、保證(zheng)傳(chuan)動(dong)系(xi)換(huan)(huan)(huan)檔(dang)(dang)時工(gong)作(zuo)平順(shun) 2:實現平順(shun)的(de)(de)(de)換(huan)(huan)(huan)檔(dang)(dang) 在(zai)汽車(che)行(xing)駛過(guo)程(cheng)中,為適(shi)應不(bu)斷變(bian)化的(de)(de)(de)行(xing)駛條件,傳(chuan)動(dong)系(xi)經(jing)常要(yao)更換(huan)(huan)(huan)不(bu)同檔(dang)(dang)位(wei)工(gong)作(zuo)。實現齒(chi)(chi)輪(lun)式變(bian)速器(qi)的(de)(de)(de)換(huan)(huan)(huan)檔(dang)(dang),一(yi)般是撥動(dong)齒(chi)(chi)輪(lun)或(huo)其他掛(gua)檔(dang)(dang)機構,使原用檔(dang)(dang)位(wei)的(de)(de)(de)某(mou)一(yi)齒(chi)(chi)輪(lun)副推出(chu)傳(chuan)動(dong),再使另一(yi)檔(dang)(dang)位(wei)的(de)(de)(de)齒(chi)(chi)輪(lun)副進入(ru)工(gong)作(zuo)。在(zai)換(huan)(huan)(huan)檔(dang)(dang)前(qian)必(bi)須踩下離合器(qi)踏板,中斷動(dong)力傳(chuan)動(dong),便(bian)于使原檔(dang)(dang)位(wei)的(de)(de)(de)嚙(nie)(nie)合副脫開,同時使新檔(dang)(dang)位(wei)嚙(nie)(nie)合副的(de)(de)(de)嚙(nie)(nie)合部位(wei)的(de)(de)(de)速度逐(zhu)步(bu)趨(qu)向同步(bu),這樣(yang)進入(ru)嚙(nie)(nie)合時的(de)(de)(de)沖擊(ji)可以大大的(de)(de)(de)減小,實現平順(shun)的(de)(de)(de)換(huan)(huan)(huan)檔(dang)(dang)。
3、防止(zhi)傳(chuan)(chuan)(chuan)動(dong)(dong)(dong)系(xi)過載 當汽(qi)車進行緊(jin)急制(zhi)(zhi)動(dong)(dong)(dong)時,若沒有(you)離(li)(li)(li)(li)合(he)(he)器,則發(fa)動(dong)(dong)(dong)機將因(yin)和傳(chuan)(chuan)(chuan)動(dong)(dong)(dong)系(xi)剛性(xing)(xing)連接而(er)急劇降低轉速,因(yin)而(er)其(qi)中所有(you)運動(dong)(dong)(dong)件將產生很大(da)(da)的(de)(de)(de)慣性(xing)(xing)力(li)矩(其(qi)數值可(ke)能(neng)大(da)(da)大(da)(da)超過發(fa)動(dong)(dong)(dong)機正(zheng)常工(gong)作時所發(fa)出的(de)(de)(de)最大(da)(da)扭距(ju)),對傳(chuan)(chuan)(chuan)動(dong)(dong)(dong)系(xi)造成(cheng)超過其(qi)承(cheng)載能(neng)力(li)的(de)(de)(de)載荷,而(er)使機件損壞。有(you)了離(li)(li)(li)(li)合(he)(he)器,便(bian)可(ke)以(yi)依靠離(li)(li)(li)(li)合(he)(he)器主(zhu)動(dong)(dong)(dong)部分(fen)和從動(dong)(dong)(dong)部分(fen)之間可(ke)能(neng)產生的(de)(de)(de)相對運動(dong)(dong)(dong)以(yi)消除這一危險。因(yin)此,我們需要離(li)(li)(li)(li)合(he)(he)器來限制(zhi)(zhi)傳(chuan)(chuan)(chuan)動(dong)(dong)(dong)系(xi)所承(cheng)受(shou)的(de)(de)(de)最大(da)(da)扭距(ju),保證安全。 離(li)(li)(li)(li)合(he)(he)器可(ke)分(fen)為:摩擦離(li)(li)(li)(li)合(he)(he)器,或是利用液體作為傳(chuan)(chuan)(chuan)動(dong)(dong)(dong)的(de)(de)(de)介質(即液力(li)偶合(he)(he)器),或是利用磁力(li)傳(chuan)(chuan)(chuan)動(dong)(dong)(dong)(即電(dian)磁離(li)(li)(li)(li)合(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。
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