1、保(bao)證汽(qi)車(che)(che)平穩起(qi)步(bu)(bu)(bu) 這(zhe)是離(li)合(he)(he)(he)器(qi)的(de)首要功能。在(zai)(zai)汽(qi)車(che)(che)起(qi)步(bu)(bu)(bu)前(qian)(qian),自然要先(xian)起(qi)動(dong)(dong)(dong)(dong)(dong)發動(dong)(dong)(dong)(dong)(dong)機。而汽(qi)車(che)(che)起(qi)步(bu)(bu)(bu)時(shi)(shi)(shi),汽(qi)車(che)(che)是從完全靜止(zhi)的(de)狀(zhuang)態(tai)逐步(bu)(bu)(bu)加(jia)(jia)速(su)的(de)。如果傳動(dong)(dong)(dong)(dong)(dong)系(xi)(它(ta)聯(lian)系(xi)著整(zheng)個汽(qi)車(che)(che))與發動(dong)(dong)(dong)(dong)(dong)機剛性地(di)聯(lian)系(xi),則變(bian)速(su)器(qi)一(yi)掛(gua)上(shang)檔,汽(qi)車(che)(che)將(jiang)突然向前(qian)(qian)沖一(yi)下,但并不(bu)能起(qi)步(bu)(bu)(bu)。這(zhe)是因為汽(qi)車(che)(che)從靜止(zhi)到前(qian)(qian)沖時(shi)(shi)(shi),產生(sheng)很(hen)大(da)慣(guan)(guan)性力(li),對(dui)(dui)發動(dong)(dong)(dong)(dong)(dong)機造成很(hen)大(da)地(di)阻(zu)力(li)矩。在(zai)(zai)這(zhe)慣(guan)(guan)性阻(zu)力(li)矩作(zuo)用下,發動(dong)(dong)(dong)(dong)(dong)機在(zai)(zai)瞬時(shi)(shi)(shi)間轉(zhuan)速(su)急劇(ju)下降到最低穩定轉(zhuan)速(su)(一(yi)般300-500RPM)以(yi)下,發動(dong)(dong)(dong)(dong)(dong)機即熄火而不(bu)能工作(zuo),當然汽(qi)車(che)(che)也不(bu)能起(qi)步(bu)(bu)(bu)。 因此,我們就(jiu)需(xu)要離(li)合(he)(he)(he)器(qi)的(de)幫助了。在(zai)(zai)發動(dong)(dong)(dong)(dong)(dong)機起(qi)動(dong)(dong)(dong)(dong)(dong)后(hou),汽(qi)車(che)(che)起(qi)步(bu)(bu)(bu)之(zhi)前(qian)(qian),駕駛(shi)員先(xian)踩(cai)下離(li)合(he)(he)(he)器(qi)踏板,將(jiang)離(li)合(he)(he)(he)器(qi)分離(li),使(shi)發動(dong)(dong)(dong)(dong)(dong)機和傳動(dong)(dong)(dong)(dong)(dong)系(xi)脫開,再將(jiang)變(bian)速(su)器(qi)掛(gua)上(shang)檔,然后(hou)逐漸松開離(li)合(he)(he)(he)器(qi)踏板,使(shi)離(li)合(he)(he)(he)器(qi)逐漸接(jie)(jie)合(he)(he)(he)。在(zai)(zai)接(jie)(jie)合(he)(he)(he)過程(cheng)中,發動(dong)(dong)(dong)(dong)(dong)機所受阻(zu)力(li)矩逐漸增(zeng)大(da),故應同(tong)時(shi)(shi)(shi)逐漸踩(cai)下加(jia)(jia)速(su)踏板,即逐步(bu)(bu)(bu)增(zeng)加(jia)(jia)對(dui)(dui)發動(dong)(dong)(dong)(dong)(dong)機的(de)燃料供給量,使(shi)發動(dong)(dong)(dong)(dong)(dong)機的(de)轉(zhuan)速(su)始終保(bao)持(chi)在(zai)(zai)最低穩定轉(zhuan)速(su)上(shang),而不(bu)致熄火。同(tong)時(shi)(shi)(shi),由于離(li)合(he)(he)(he)器(qi)的(de)接(jie)(jie)合(he)(he)(he)緊(jin)密程(cheng)度逐漸增(zeng)大(da),發動(dong)(dong)(dong)(dong)(dong)機經傳動(dong)(dong)(dong)(dong)(dong)系(xi)傳給驅動(dong)(dong)(dong)(dong)(dong)車(che)(che)輪的(de)轉(zhuan)矩便逐漸增(zeng)加(jia)(jia),到牽引力(li)足(zu)以(yi)克服起(qi)步(bu)(bu)(bu)阻(zu)力(li)時(shi)(shi)(shi),汽(qi)車(che)(che)即從靜止(zhi)開始運動(dong)(dong)(dong)(dong)(dong)并逐步(bu)(bu)(bu)加(jia)(jia)速(su)
2、保證傳(chuan)動(dong)(dong)系換(huan)檔(dang)時工(gong)作平順(shun) 2:實(shi)現(xian)平順(shun)的(de)(de)換(huan)檔(dang) 在(zai)(zai)汽(qi)車(che)行(xing)駛(shi)過程中(zhong)(zhong),為適(shi)應不斷(duan)變(bian)化的(de)(de)行(xing)駛(shi)條件,傳(chuan)動(dong)(dong)系經常(chang)要更換(huan)不同(tong)檔(dang)位(wei)工(gong)作。實(shi)現(xian)齒(chi)輪(lun)式變(bian)速(su)(su)器的(de)(de)換(huan)檔(dang),一般是撥(bo)動(dong)(dong)齒(chi)輪(lun)或其他(ta)掛檔(dang)機構,使原(yuan)用檔(dang)位(wei)的(de)(de)某一齒(chi)輪(lun)副推出傳(chuan)動(dong)(dong),再使另一檔(dang)位(wei)的(de)(de)齒(chi)輪(lun)副進(jin)(jin)入(ru)工(gong)作。在(zai)(zai)換(huan)檔(dang)前必(bi)須踩下離合(he)器踏板,中(zhong)(zhong)斷(duan)動(dong)(dong)力(li)傳(chuan)動(dong)(dong),便于使原(yuan)檔(dang)位(wei)的(de)(de)嚙(nie)合(he)副脫(tuo)開(kai),同(tong)時使新(xin)檔(dang)位(wei)嚙(nie)合(he)副的(de)(de)嚙(nie)合(he)部位(wei)的(de)(de)速(su)(su)度(du)逐(zhu)步(bu)趨向同(tong)步(bu),這(zhe)樣進(jin)(jin)入(ru)嚙(nie)合(he)時的(de)(de)沖(chong)擊可以(yi)大大的(de)(de)減(jian)小,實(shi)現(xian)平順(shun)的(de)(de)換(huan)檔(dang)。
3、防止(zhi)傳(chuan)(chuan)動(dong)(dong)(dong)(dong)系過載(zai) 當汽車進行緊(jin)急(ji)制動(dong)(dong)(dong)(dong)時,若沒有(you)(you)離(li)合器(qi),則發(fa)(fa)動(dong)(dong)(dong)(dong)機將因和傳(chuan)(chuan)動(dong)(dong)(dong)(dong)系剛性(xing)連接而(er)急(ji)劇降(jiang)低轉速,因而(er)其(qi)(qi)中所(suo)有(you)(you)運動(dong)(dong)(dong)(dong)件(jian)將產(chan)生(sheng)很(hen)大的(de)慣性(xing)力(li)矩(其(qi)(qi)數(shu)值(zhi)可(ke)(ke)能(neng)大大超(chao)過發(fa)(fa)動(dong)(dong)(dong)(dong)機正(zheng)常工作(zuo)(zuo)時所(suo)發(fa)(fa)出的(de)最大扭(niu)距(ju)),對傳(chuan)(chuan)動(dong)(dong)(dong)(dong)系造成超(chao)過其(qi)(qi)承(cheng)(cheng)載(zai)能(neng)力(li)的(de)載(zai)荷,而(er)使機件(jian)損壞。有(you)(you)了離(li)合器(qi),便可(ke)(ke)以(yi)依靠離(li)合器(qi)主動(dong)(dong)(dong)(dong)部(bu)分和從動(dong)(dong)(dong)(dong)部(bu)分之間可(ke)(ke)能(neng)產(chan)生(sheng)的(de)相對運動(dong)(dong)(dong)(dong)以(yi)消除(chu)這一危(wei)險(xian)。因此(ci),我們需要離(li)合器(qi)來限(xian)制傳(chuan)(chuan)動(dong)(dong)(dong)(dong)系所(suo)承(cheng)(cheng)受的(de)最大扭(niu)距(ju),保證安(an)全。 離(li)合器(qi)可(ke)(ke)分為:摩擦離(li)合器(qi),或是(shi)(shi)利用液體作(zuo)(zuo)為傳(chuan)(chuan)動(dong)(dong)(dong)(dong)的(de)介質(zhi)(即液力(li)偶合器(qi)),或是(shi)(shi)利用磁(ci)力(li)傳(chuan)(chuan)動(dong)(dong)(dong)(dong)(即電磁(ci)離(li)合器(qi)}
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。
廣汽本田(tian)旗下首款純(chun)電(dian)動SUV車型VE-1(廣汽本田(tian)VE-1)2018年11月19日上市
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