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湖 南 科 技 大 學(xué)
畢 業(yè) 設(shè) 計(jì) 開(kāi) 題 報(bào) 告
學(xué) 院： 機(jī)電工程
專 業(yè)： 機(jī)械設(shè)計(jì)制造及自動(dòng)化
學(xué) 號(hào)： 1103050205
姓 名： 肖鵬
指導(dǎo)老師： 陳立鋒
日 期： 2014年 1 月 8日
湖南科技大學(xué)2015屆畢業(yè)設(shè)計(jì)（論文）開(kāi)題報(bào)告
題 目
帕薩特B5五檔變速器結(jié)構(gòu)設(shè)計(jì)
作者姓名
肖鵬
學(xué)號(hào)
1103050205
所學(xué)專業(yè)
機(jī)械設(shè)計(jì)制造及其自動(dòng)化
1、 研究的意義，同類研究工作國(guó)內(nèi)外現(xiàn)狀、存在問(wèn)題（列出主要參考文獻(xiàn)）
意義：汽車(chē)傳動(dòng)系是汽車(chē)的核心組成部分。其任務(wù)是調(diào)節(jié)變換發(fā)動(dòng)機(jī)的性能，將動(dòng)力有效而經(jīng)濟(jì)地傳至驅(qū)動(dòng)車(chē)輪，以滿足汽車(chē)的使用要求。變速器是完成傳動(dòng)系任務(wù)的重要部件，也是決定整車(chē)性能的主要部件之一。變速器的設(shè)計(jì)水平對(duì)汽車(chē)的動(dòng)力性、燃料經(jīng)濟(jì)性、換擋操縱的可靠性與輕便性、傳動(dòng)平穩(wěn)性與效率等都有直接的影響。
現(xiàn)狀和問(wèn)題：汽車(chē)機(jī)械式變速器經(jīng)過(guò)多年的研究和發(fā)展，已經(jīng)積累了相當(dāng)?shù)脑O(shè)計(jì)和生產(chǎn)經(jīng)驗(yàn)，形成不少定型的產(chǎn)品?，F(xiàn)代商用車(chē)大都采用三軸式機(jī)械變速器，乘用車(chē)大都選用二軸式機(jī)械變速器。在變速器上廣泛采用斜齒輪常嚙合齒輪傳動(dòng)，用同步器換擋。
變速器是汽車(chē)傳動(dòng)的最主要的部件之一，缺點(diǎn)是齒輪壽命低，磨損大，有噪音，有些車(chē)上的變速器比較笨重，體積較大。
2、 研究目標(biāo)、內(nèi)容和擬解決的關(guān)鍵問(wèn)題（根據(jù)任務(wù)要求進(jìn)一步具體化）
目標(biāo)： （1）解決齒輪壽命低問(wèn)題
（2）解決齒輪磨損嚴(yán)重問(wèn)題
（3）如何降低噪音
（4）如何改變?cè)O(shè)計(jì)及材料的選擇，使得體積較小重量較輕。
內(nèi)容： （1）變速箱主要零件參數(shù)設(shè)計(jì)
（2）變速箱結(jié)構(gòu)強(qiáng)度分析
(3)三維建模以及CAD圖紙?jiān)O(shè)計(jì)，A0圖紙三張
關(guān)鍵問(wèn)題：變速箱兩軸的設(shè)計(jì)，齒輪的設(shè)計(jì)及其強(qiáng)度的保證，同步器的設(shè)計(jì)。
3、 特色與創(chuàng)新之處
（1）.結(jié)構(gòu)緊湊
（2）.體積小
（3）.工藝簡(jiǎn)化
（4）.成本相對(duì)較低
（5）.重量輕
4、 擬采取的研究方法、步驟、技術(shù)路線
（1） 根據(jù)自己所選擇的類型進(jìn)行參數(shù)選擇和設(shè)計(jì)
（2） 根據(jù)參數(shù)進(jìn)行計(jì)算校核，分析，比較，最后定型
（3） 根據(jù)自己選好的參數(shù)進(jìn)行三維建模，裝配干涉檢查。
5、 擬使用的主要設(shè)計(jì)、分析軟件及儀器設(shè)備
結(jié)構(gòu)設(shè)計(jì)，Proe應(yīng)用軟件建模，CAD應(yīng)用軟件繪圖
6、參考文獻(xiàn)
1. 肖生發(fā)，趙樹(shù)朋，汽車(chē)構(gòu)造[M]（第二版）,北京：北京大學(xué)出版社,2012.7
2.胡忠舉 陸名彰 ，《機(jī)械制造技術(shù)基礎(chǔ)》[M]（第二版），中南大學(xué)出版社,2011.8
3. 王望予, 《汽車(chē)設(shè)計(jì)》[M] (第四版)、北京、機(jī)械工業(yè)出版社、2004.8
4.濮良貴，紀(jì)名剛，《機(jī)械設(shè)計(jì)》[M]（第八版），高等教育出版社，2005.12
5.潘存云，《機(jī)械原理》[M]（第二版），中南大學(xué)出版社，2011.11
注：
1、開(kāi)題報(bào)告是本科生畢業(yè)設(shè)計(jì)（論文）的一個(gè)重要組成部分。學(xué)生應(yīng)根據(jù)畢業(yè)設(shè)計(jì)（論文）任務(wù)書(shū)的要求和文獻(xiàn)調(diào)研結(jié)果，在開(kāi)始撰寫(xiě)論文之前寫(xiě)出開(kāi)題報(bào)告。
2、參考文獻(xiàn)按下列格式（A為期刊，B為專著）
A：[序號(hào)]、作者（外文姓前名后，名縮寫(xiě)，不加縮寫(xiě)點(diǎn)，3人以上作者只寫(xiě)前3人，后用“等”代替。）、題名、期刊名（外文可縮寫(xiě)，不加縮寫(xiě)點(diǎn)）年份、卷號(hào)（期號(hào)）：起止頁(yè)碼。
B：[序號(hào)]、作者、書(shū)名、版次、（初版不寫(xiě)）、出版地、出版單位、出版時(shí)間、頁(yè)碼。
3、表中各項(xiàng)可加附頁(yè)。
3
湖 南 科 技 大 學(xué)
英文文獻(xiàn)翻譯
學(xué) 生 姓 名： 肖鵬
學(xué) 院： 機(jī)電工程學(xué)院
專業(yè)及班級(jí)： 機(jī)械設(shè)計(jì)制造及其自動(dòng)化三班
學(xué) 號(hào)： 1103050205
指 導(dǎo) 教 師： 陳立峰
2015 年 4 月 30 日
汽車(chē)變速器設(shè)計(jì)
我們知道，汽車(chē)發(fā)動(dòng)機(jī)在一定的轉(zhuǎn)速下能夠達(dá)到最好的狀態(tài)，此時(shí)發(fā)出的功率比較大，燃油經(jīng)濟(jì)性也比較好。因此，我們希望發(fā)動(dòng)機(jī)總是在最好的狀態(tài)下工作。但是，汽車(chē)在使用的時(shí)候需要有不同的速度，這樣就產(chǎn)生了矛盾。這個(gè)矛盾要通過(guò)變速器來(lái)解決。
汽車(chē)變速器的作用用一句話概括，就叫做變速變扭，即增速減扭或減速增扭。為什么減速可以增扭，而增速又要減扭呢？設(shè)發(fā)動(dòng)機(jī)輸出的功率不變，功率可以表示為 N = wT，其中w是轉(zhuǎn)動(dòng)的角速度，T是扭距。當(dāng)N固定的時(shí)候，w與T是成反比的。所以增速必減扭，減速必增扭。汽車(chē)變速器齒輪傳動(dòng)就根據(jù)變速變扭的原理，分成各個(gè)檔位對(duì)應(yīng)不同的傳動(dòng)比，以適應(yīng)不同的運(yùn)行狀況。
一般的手動(dòng)變速器內(nèi)設(shè)置輸入軸、中間軸和輸出軸，又稱三軸式，另外還有倒檔軸。三軸式是變速器的主體結(jié)構(gòu)，輸入軸的轉(zhuǎn)速也就是發(fā)動(dòng)機(jī)的轉(zhuǎn)速，輸出軸轉(zhuǎn)速則是中間軸與輸出軸之間不同齒輪嚙合所產(chǎn)生的轉(zhuǎn)速。不同的齒輪嚙合就有不同的傳動(dòng)比，也就有了不同的轉(zhuǎn)速。例如鄭州日產(chǎn)ZN6481W2G型SUV車(chē)手動(dòng)變速器，它的傳動(dòng)比分別是：1檔3.704:１；2檔2.202:1；3檔1.414:1；4檔1:1；5檔（超速檔）0.802:1。
當(dāng)汽車(chē)啟動(dòng)司機(jī)選擇1檔時(shí)，撥叉將1/2檔同步器向后接合1檔齒輪并將它鎖定輸出軸上，動(dòng)力經(jīng)輸入軸、中間軸和輸出軸上的1檔齒輪，1檔齒輪帶動(dòng)輸出軸，輸出軸將動(dòng)力傳遞到傳動(dòng)軸上（紅色箭頭）。典型1檔變速齒輪傳動(dòng)比是3:1,也就是說(shuō)輸入軸轉(zhuǎn)3圈，輸出軸轉(zhuǎn)1圈。
?當(dāng)汽車(chē)增速司機(jī)選擇2檔時(shí)，撥叉將1/2檔同步器與1檔分離后接合2檔齒輪并鎖定輸出軸上，動(dòng)力傳遞路線相似，所不同的是輸出軸上的1檔齒輪換成2檔齒輪帶動(dòng)輸出軸。典型2檔變速齒輪傳動(dòng)比是2.2:1，輸入軸轉(zhuǎn)2.2圈，輸出軸轉(zhuǎn)1圈，比1檔轉(zhuǎn)速增加，扭矩降低。
當(dāng)汽車(chē)加油增速司機(jī)選擇3檔時(shí)，撥叉使1/2檔同步器回到空檔位置，又使3/4檔同步器移動(dòng)直至將3檔齒輪鎖定在輸出軸上，使動(dòng)力可以從軸入軸—中間軸—輸出軸上的3檔變速齒輪，通過(guò)3檔變速齒輪帶動(dòng)輸出軸。典型3檔傳動(dòng)比是1.7:1，輸入軸轉(zhuǎn)1.7圈，輸出軸轉(zhuǎn)1圈，是進(jìn)一步的增速。
當(dāng)汽車(chē)加油增速司機(jī)選擇4檔時(shí)，撥叉將3/4檔同步器脫離3檔齒輪直接與輸入軸主動(dòng)齒輪接合，動(dòng)力直接從輸入軸傳遞到輸出軸，此時(shí)傳動(dòng)比1:1，即輸出軸與輸入軸轉(zhuǎn)速一樣。由于動(dòng)力不經(jīng)中間軸，又稱直接檔，該檔傳動(dòng)比的傳動(dòng)效率最高。汽車(chē)多數(shù)運(yùn)行時(shí)間都用直接檔以達(dá)到最好的燃油經(jīng)濟(jì)性。
換檔時(shí)要先進(jìn)入空檔，變速器處于空檔時(shí)變速齒輪沒(méi)有鎖定在輸出軸上，它們不能帶動(dòng)輸出軸轉(zhuǎn)動(dòng)，沒(méi)有動(dòng)力輸出。
一般汽車(chē)手動(dòng)變速器傳動(dòng)比主要分上述1－4檔，通常設(shè)計(jì)者首先確定最低（1檔）與最高（4檔）傳動(dòng)比后，中間各檔傳動(dòng)比一般按等比級(jí)數(shù)分配。另外，還有倒檔和超速檔，超速檔又稱為5檔。
當(dāng)汽車(chē)要加速超過(guò)同向汽車(chē)時(shí)司機(jī)選擇5檔，典型5檔傳動(dòng)比是0.87:1，也就是用大齒輪帶動(dòng)小齒輪，當(dāng)主動(dòng)齒輪轉(zhuǎn)0.87圈時(shí)，被動(dòng)齒輪已經(jīng)轉(zhuǎn)完1圈了。
倒檔時(shí)輸出軸要向相反方向旋轉(zhuǎn)。如果一對(duì)齒輪嚙合時(shí)大家反向旋轉(zhuǎn)，中間加上一個(gè)齒輪就會(huì)變成同向旋轉(zhuǎn)。利用這個(gè)原理，倒檔就要添加一個(gè)齒輪做“媒介”，將軸的轉(zhuǎn)動(dòng)方向調(diào)轉(zhuǎn)，因此就有了一根倒檔軸。倒檔軸獨(dú)立裝在變速器殼內(nèi)，與中間軸平行，當(dāng)軸上齒輪分別與中間軸齒輪和輸出軸齒輪嚙合時(shí)，輸出軸轉(zhuǎn)向會(huì)相反。
?通常倒檔用的同步器也控制5檔的接合，所以5檔與倒檔位置是在同一側(cè)的。由于有中間齒輪，一般變速器倒檔傳動(dòng)比大于1檔傳動(dòng)比，增扭大，有些汽車(chē)遇到陡坡用前進(jìn)檔上不去就用倒檔開(kāi)上去。
從駕駛平順性考慮，變速器檔位越多越好，檔位多相鄰檔間的傳動(dòng)比的比值變化小，換檔容易而且平順。但檔位多的缺點(diǎn)就是變速器構(gòu)造復(fù)雜，體積大，現(xiàn)在輕型汽車(chē)變速器一般是4－5檔。同時(shí)，變速器傳動(dòng)比都不是整數(shù)，而是都帶小數(shù)點(diǎn)的，這是因?yàn)閲Ш淆X輪的齒數(shù)不是整倍數(shù)所致，兩齒輪齒數(shù)是整倍數(shù)就會(huì)導(dǎo)致兩齒輪嚙合面磨損不均勻，使得輪齒表面質(zhì)量產(chǎn)生較大的差異。
手動(dòng)變速器與同步器
手動(dòng)變速器是最常見(jiàn)的變速器，簡(jiǎn)稱MT。它的基本構(gòu)造用一句話概括，就是兩軸一中軸，即指輸入軸、軸出軸和中間軸，它們構(gòu)成了變速器的主體，當(dāng)然還有一根倒檔軸。手動(dòng)變速器又稱手動(dòng)齒輪式變速器，含有可以在軸向滑動(dòng)的齒輪，通過(guò)不同齒輪的嚙合達(dá)到變速變扭目的。典型的手動(dòng)變速器結(jié)構(gòu)及原理如下。
輸入軸也稱第一軸，它的前端花鍵直接與離合器從動(dòng)盤(pán)的花鍵套配合，從而傳遞由發(fā)動(dòng)機(jī)過(guò)來(lái)的扭矩。第一軸上的齒輪與中間軸齒輪常嚙合，只要軸入軸一轉(zhuǎn)，中間軸及其上的齒輪也隨之轉(zhuǎn)動(dòng)。中間軸也稱副軸，軸上固連多個(gè)大小不等的齒輪。輸出軸又稱第二軸，軸上套有各前進(jìn)檔齒輪，可隨時(shí)在操縱裝置的作用下與中間軸的對(duì)應(yīng)齒輪嚙合，從而改變本身的轉(zhuǎn)速及扭矩。輸出軸的尾端有花鍵與傳動(dòng)軸相聯(lián)，通過(guò)傳動(dòng)軸將扭矩傳送到驅(qū)動(dòng)橋減速器。
由此可知，變速器前進(jìn)檔位的驅(qū)動(dòng)路徑是：輸入軸常嚙齒輪－中間軸常嚙齒輪－中間軸對(duì)應(yīng)齒輪－第二軸對(duì)應(yīng)齒輪。倒車(chē)軸上的齒輪也可以由操縱裝置撥動(dòng)，在軸上移動(dòng)，與中間軸齒輪和輸出軸齒輪嚙合,以相反的旋轉(zhuǎn)方向輸出。
多數(shù)汽車(chē)都有5個(gè)前進(jìn)檔和一個(gè)倒檔，每個(gè)檔位有一定的傳動(dòng)比，多數(shù)檔位傳動(dòng)比大于1，第4檔傳動(dòng)比為1，稱為直接檔，而傳動(dòng)比小于1的第5檔稱為加速檔。空檔時(shí)輸出軸的齒輪處于非嚙合位置，無(wú)法接受動(dòng)力傳輸。
由于變速器輸入軸與輸出軸以各自的速度旋轉(zhuǎn)，變換檔位時(shí)合存在一個(gè)"同步"問(wèn)題。兩個(gè)旋轉(zhuǎn)速度不一樣齒輪強(qiáng)行嚙合必然會(huì)發(fā)生沖擊碰撞，損壞齒輪。因此，舊式變速器的換檔要采用"兩腳離合"的方式，升檔在空檔位置停留片刻，減檔要在空檔位置加油門(mén)，以減少齒輪的轉(zhuǎn)速差。但這個(gè)操作比較復(fù)雜，難以掌握精確。因此設(shè)計(jì)師創(chuàng)造出"同步器"，通過(guò)同步器使將要嚙合的齒輪達(dá)到一致的轉(zhuǎn)速而順利嚙合。
目前全同步式變速器上采用的是慣性同步器，它主要由接合套、同步鎖環(huán)等組成，它的特點(diǎn)是依靠摩擦作用實(shí)現(xiàn)同步。接合套、同步鎖環(huán)和待接合齒輪的齒圈上均有倒角（鎖止角），同步鎖環(huán)的內(nèi)錐面與待接合齒輪齒圈外錐面接觸產(chǎn)生摩擦。鎖止角與錐面在設(shè)計(jì)時(shí)已作了適當(dāng)選擇，錐面摩擦使得待嚙合的齒套與齒圈迅速同步，同時(shí)又會(huì)產(chǎn)生一種鎖止作用，防止齒輪在同步前進(jìn)行嚙合。當(dāng)同步鎖環(huán)內(nèi)錐面與待接合齒輪齒圈外錐面接觸后，在摩擦力矩的作用下齒輪轉(zhuǎn)速迅速降低（或升高）到與同步鎖環(huán)轉(zhuǎn)速相等，兩者同步旋轉(zhuǎn)，齒輪相對(duì)于同步鎖環(huán)的轉(zhuǎn)速為零，因而慣性力矩也同時(shí)消失，這時(shí)在作用力的推動(dòng)下，接合套不受阻礙地與同步鎖環(huán)齒圈接合，并進(jìn)一步與待接合齒輪的齒圈接合而完成換檔過(guò)程
自動(dòng)變速器
自動(dòng)變速器的選擋桿相當(dāng)于手動(dòng)變速器的變速桿，一般有以下幾個(gè)擋位：P(停車(chē))、R(倒擋)、N(空擋)、D(前進(jìn))、S(or2，即為2速擋)、L(or1，即為1速擋)。這幾個(gè)擋位的正確使用對(duì)于駕駛自動(dòng)變速器汽車(chē)的人來(lái)說(shuō)尤其重要，下面就讓我們一起來(lái)熟悉一下自動(dòng)變速器各擋位的使用要領(lǐng)。
●P(停車(chē)擋)的使用
發(fā)動(dòng)機(jī)運(yùn)轉(zhuǎn)時(shí)只要選擋桿在行駛位置上，自動(dòng)變速器汽車(chē)就很容易地行走。而停放時(shí)，選擋桿必須扳入P位，從而通過(guò)變速器內(nèi)部的停車(chē)制動(dòng)裝置將輸出軸鎖住，并拉緊手制動(dòng)，防止汽車(chē)移動(dòng)。
●R(倒擋)的使用
R位為倒擋，使用中要切記，自動(dòng)變速器汽車(chē)不像手動(dòng)變速器汽車(chē)那樣能夠使用半聯(lián)動(dòng)，故在倒車(chē)時(shí)要特別注意加速踏板的控制。
●N(空擋)的使用
N位相當(dāng)于空擋，可在起動(dòng)時(shí)或拖車(chē)時(shí)使用。在等待信號(hào)或堵車(chē)時(shí)常常將選擋桿保持在D位，同時(shí)踩下制動(dòng)。若時(shí)間很短，這樣做是允許的，但若停止時(shí)間長(zhǎng)時(shí)最好換入N位，并拉緊手制動(dòng)。因?yàn)檫x擋桿在行駛位置上，自動(dòng)變速器汽車(chē)一般都有微弱的行駛趨勢(shì)，長(zhǎng)時(shí)間踩住制動(dòng)等于強(qiáng)行制止這種趨勢(shì)，使得變速器油溫升高，油液容易變質(zhì)。尤其在空調(diào)器工作、發(fā)動(dòng)機(jī)怠速較高的情況下更為不利。有些駕駛員為了節(jié)油，在高速行駛或下坡時(shí)將選擋桿扳到N位滑行，這很容易燒壞變速器，因?yàn)檫@時(shí)變速器輸出軸轉(zhuǎn)速很高，而發(fā)動(dòng)機(jī)卻在怠速運(yùn)轉(zhuǎn)，油泵供油不足，潤(rùn)滑狀況惡化，易燒壞變速器。
●D(前進(jìn)擋)的使用
正常行駛時(shí)將選擋桿放在D位，汽車(chē)可在1～4擋(或3擋)之間自動(dòng)換擋。D位是最常用的行駛位置。需要掌握的是：由于自動(dòng)變速器是根據(jù)油門(mén)大小與車(chē)速高低來(lái)確定擋位的，所以加速踏板操作方法不同，換擋時(shí)的車(chē)速也不相同。如果起步時(shí)迅速將加速踏板踩下，升擋晚，加速能力強(qiáng)，到一定車(chē)速后，再將加速踏板很快松開(kāi)，汽車(chē)就能立即升擋，這樣發(fā)動(dòng)機(jī)噪聲小，舒適性好。
D位的另一個(gè)特點(diǎn)是強(qiáng)制低擋，便于高速時(shí)超車(chē)，在D位行駛中迅速將加速踏板踩到底，接通強(qiáng)制低擋開(kāi)關(guān)就能自動(dòng)減擋，汽車(chē)很快加速，超車(chē)之后松開(kāi)加速踏板又可自動(dòng)升擋。
●S、L位低擋的使用
自動(dòng)變速器在S位或L位上處于低擋范圍，可以在坡道等情況下使用。下坡時(shí)換入S位或L位能充分利用發(fā)動(dòng)機(jī)制動(dòng)，避免車(chē)輪制動(dòng)器過(guò)熱，導(dǎo)致制動(dòng)效能下降。但是從D位換入S位或L位時(shí)，車(chē)速不能高于相應(yīng)的升擋車(chē)速，否則發(fā)動(dòng)機(jī)會(huì)強(qiáng)烈振動(dòng)，使變速器油溫急劇上升，甚至?xí)p壞變速器。
另外在雨霧天氣時(shí)，若路面附著條件差，可以換入S位或L位，固定在某一低擋行駛，不要使用能自動(dòng)換擋的位置，以免汽車(chē)打滑。同時(shí)必須牢記，打滑時(shí)可將選擋桿推入N位，切斷發(fā)動(dòng)機(jī)的動(dòng)力，以保證行車(chē)安全。
Transmission design
As we all know,automobile engine to a certain speed can be achieved under the best conditions, when compared issued by the power, fuel economy is relatively good. Therefore, we hope that the engine is always in the best of conditions to work under. However, the use of motor vehicles need to have different speeds, thus creating a conflict. Transmission through this conflict to resolve.
Automotive Transmission role sum up in one sentence, called variable speed twisting, twisting or slow down the growth rate by increasing torsional. Why can slow down by twisting, and the growth rate but also by twisting? For the same engine power output, power can be expressed as N = wT, where w is the angular velocity of rotation, and T Niuju. When N fixed, w and T is inversely proportional to the. Therefore, the growth rate will reduce twisting, twisting slowdown will increase. Automotive Transmission speed gear based on the principle of variable twisted into various stalls of different transmission ratio corresponding to adapt to different operational conditions.
General to set up a manual gearbox input shaft, intermediate shaft and output shaft, also known as the three-axis, as well as Daodang axis. Three-axis is the main transmission structure, input shaft speed is the speed of the engine, the output shaft speed is the intermediate shaft and output shaft gear meshing between different from the speed. Different gears are different transmission ratio, and will have a different speed. For example Zhengzhourichan ZN6481W2G manual transmission car-SUV, its transmission ratio are: 1 File 3.704:1; stalls 2.202:1; stalls 1.414:1; stalls 1:1 5 stalls (speeding file) 0.802: 1.
When drivers choose a launch vehicle stalls, Plectrum will be 1 / 2 file synchronization engagement with a back stall gear and output shaft lock it, the power input shaft, intermediate shaft and output shaft gear of a stall, a stall the output shaft gear driven, and the output shaft power will be transmitted to the drive shaft (red arrow). A typical stall Biansuchilun transmission ratio is 3:1, that is to say three laps to the input shaft and output shaft to a circle.
When the growth rate of car drivers choose two stalls, Plectrum will be 1 / 2-file synchronization and file a joint separation after 2 stall and lock the output shaft gear, power transmission line similar, the difference is that the output shaft gear of a stall 2 stall replaced by the output shaft gear driven. 2 stall Biansuchilun typical transmission ratio is 2.2:1, 2.2 laps to the input shaft and output shaft to a circle than a stall speed increase, lower torque.
When refueling vehicle drivers growth stalls option 3, Plectrum to 1 / 2 back to the free file-synchronization position, and also allows the 3 / 4 file synchronization Mobile stall until 3 in the output shaft gear lock, power can be into the shaft axis - intermediate shaft - the output shaft of the three stalls Biansuchilun, led through three stalls Biansuchilun output shaft. 3 stalls typical transmission ratio is 1.7:1, 1.7 laps to the input shaft and output shaft to a circle is further growth.
When car drivers Option 4 refueling growth stalls, Plectrum will be 3 / 4 from the 3-file synchronization stall gear directly with the input shaft gear joint initiative, and power transmission directly from the input shaft to the output shaft, the transmission ratio at 1:1, that the input shaft and output shaft speed the same. The driving force without intermediate shaft, also known as direct file, the file transmission than the maximum transmission efficiency. Most cars run-time files are used directly to achieve the best fuel economy.
Shift into the first interval when, in a free transmission when Biansuchilun output shaft is not locked in, they can not rotate the output shaft driven, not power output.
General automotive manual transmission than the main 1-4 stalls, usually the first designers to determine the minimum (one stall) and maximum (4 files) transmission ratio, the middle stall drive by geometric progression than the general distribution. In addition, there are stalls Daodang and speeding, speeding file is also known as the five stalls.
When the car to accelerate to more than car drivers with the choice of five stalls, and a typical five-transmission ratio is 0.87:1, which is driven by a pinion gear, the gear when the initiative to 0.87 zone, passive gear have been transferred to a circle of the End.
DaoDang, the opposite direction to the output shaft rotation. If one pair of meshing gears when we reverse rotation, with a middle gear, it will become the same to the rotation. Use of this principle, we should add a gear Daodang the "media" will be rotational direction reversed, it will have a Daodang axis. Daodang installed in the transmission shaft independent crust, and the intermediate shaft parallel axis gear with the intermediate shaft and output shaft gear meshing gears, will be contrary to the output shaft.
Daodang usually used for the synchronization control also joins five stalls, stalls and Daodang 5 position in the same side. As a middle gear, the general transmission Daodang transmission ratio greater than 1 file transmission ratio, by twisting, steep slope with some vehicles encountered on the progress stalls falters with a Daodang boost.
Ride from the driver of the considerations, better transmission stall, stall adjacent stall more than the transmission changes the ratio of small, and easy to shift smoothly. However, the shortcomings of the stalls is more transmission structure is complicated, bulky, light vehicle transmission is generally 4-5 stalls. At the same time, transmission ratio is not integral, but with all of the decimal point, it is because of the gear teeth meshing is not caused by the whole multiples of two gear teeth can lead to the whole multiples of two meshing gears of uneven wear, making the tooth surface quality have a greater difference.
Manual transmission and synchronizer
Manual transmission is the most common transmission, or MT. Its basic structure sum up in one sentence, is a two-axle shaft, where input shaft, the shaft axis and intermediate shaft, which constitute the main body of the transmission and, of course, a Daodang axis. Manual transmission known as manual gear transmission, which can be in the axial sliding gears, the gears meshing different variable speed reached twisting purpose. Typical manual transmission structure and principles are as follows.
Input shaft also said that the first axis, and its front-end Spline driven directly with the clutch disc sets with the Spline, by the transfer of torque from the engine. The first axis of the intermediate shaft and gears meshing gears often, as long as the shaft axis to a turn, the intermediate shaft and gear also will be rotating. Vice also said intermediate shaft axis, the axis-even more than the size gear. Also known as the second output shaft axis, the axis of various sets of gear stall progress can be manipulated at any time in the role of the device and the corresponding intermediate shaft gear meshing, thus changing its speed and torque. With the end of the output shaft spline associated with the drive shaft through the drive shaft torque transmitted to the drive axle reducer.
Thus, progress stalls drive transmission path is: input shaft gear often rodents - often rodents intermediate shaft gear - corresponding intermediate shaft gear - the second axis corresponding gear. Reversing the gear shaft can be manipulated by the device pick in the axis movement, and the intermediate shaft and output shaft gear meshing gears, to the contrary to the direction of rotation output.
Most cars have five stalls and a Daodang forward, a certain degree of each stall transmission ratio, the majority of stalls transmission ratio greater than 1, 4 file transmission ratio of 1, known as direct stalls, and transmission ratio is less than 1 No. 5 stall called accelerated stall. Free at the output shaft gear in a position of non-engagement, unacceptable power transmission.
The transmission input shaft and output shaft rotational speed to their own, transform a stall when there is a "synchronous". Two different rotational speed gear meshing force will impact the collision occurred, damage gear. Therefore, the old transmission shift to a "feet-off" approach, or stall on the location of the free stay for a while by stalls in the free position refueling doors, in order to reduce the speed differential gear. However, this operation is relatively more complicated and difficult to grasp accurate. So designers create a "synchronized," and allows synchronization through the meshing of gears to be consistent speed and smooth meshing.
At present Synchronous Transmission is based on the synchronization of inertia, mainly from joint sets, synchronous lock ring, and so on, it is characterized by friction on the role of synchronization. Splice sets Genlock engagement ring gear and the ring gear when it had Chamfer (Lock angle), Genlock within the cone ring gear engagement with the question of cone ring gear contact friction. Lock and cone angle has been made in the design of an appropriate choice to be made friction cone of the teeth meshing with the ring gear quickly sets pace at the same time will have a Lock role and to prevent the gears meshing in sync before. When synchronization lock cone ring gear engagement with the question of cone ring gear after contact in the effects of friction torque gear speed quickly lower (or higher) with the same speed synchronous lock ring, the two synchronous rotation of the gear Genlock Central zero speed, thus moment of inertia also disappear, then in force under the impetus of engagement sets unhindered and synchronization lock ring gear engagement, and further engagement with the question of gear engagement and the completion Gear Shift Process.
The automatic gearbox
The automatic gearbox chooses to block the pole the equal to moving the stick shift of the gearbox, having generally below several blocks:P( parking), R( pour to block), N( get empty to block), D( go forward), S( or2, namely for 2 block soon), L.( or1, namely for 1 block soon)This several an usage for blocking a right usages coming driver the automatic gearbox is automotive of person to say particularly important, underneath let us very much familiar with once automatic gearbox eachly blockings main theme.
The usage of the P ( the parking blocks)
The launches the luck turns as long as choose to block the pole in driving the position, automatic gearbox car run about very easily.But park, choose to block the pole must pull into of P, from but pass the internal parking system in gearbox moves the device will output the stalk lock lives, combining to tense the hand system move, preventing the car ambulation.
The usage of the R( pour to block)
R a control for is pouring blocking, using inside wanting slicing recording, automatic gearbox car unlike moving gearbox car so can using half moving, so while reversing the car wanting special attention accelerating pedal.
The usage of the N( get empty to block)
The N is equal to get empty to block, can while starting or hour of trailer usage.At wait for the signal or block up the car will often often choose to block the pole keeps in the of D, trampling at the same time the next system move.If time is very short, do like this is an admission of, but if stop the time long time had better change into of N, combine to tense the hand system moves.Because choose to block the pole in driving the position, the automatic gearbox car has generally and all to drive the trend faintly, long hours trample the system move same as a deterrent this kind of trend, make gearbox oil gone up, the oil liquid changes in character easily.Particularly in the air condition machine work, launch the soon higher circumstance in machine bottom more disadvantageous.Some pilots for the sake of stanza oil, at made good time or go down slope will choose to block the pole pull the of N skids, this burn the bad gearbox very easily, launching the machine to revolves soon in the however because the gearbox outputs at this time the stalk turns soon very high,, the oil pump provides the oil shortage, lubricating the condition worsen, burn the bad gearbox easily.
The usage of the D( go forward to block)
Will choose to block when is normal to drive the pole put in the of D, car can at 1 ～ 4 block( or 3 block) its change to block automatically.The of D drives the position most in common usely.What demand control is:Because the automatic gearbox is soon high and low with car to come to make sure to block according to the accelerator size a, so accelerate the pedal operation method is different, changing to block the hour of the car is soon too not same alike.If start hour quick accelerate the pedal tramples the bottom, rising to block the night, accelerating the ability is strong, arriving certain car soon behind, then will accelerate the pedal loosen to open very quickly, car can rise to block immediately, launch like this the machine voice is small, comfortable good.
The another characteristics of the D is a compulsory low blocking, easy to high speed the hour overtakes a car, will accelerate quickly in of D drove the pedal trample after all, connect the compulsory low fend off the pass and then can reduce to block automatically, the car accelerates very quickly, after overtaking a car loosen to open the pedal of acceleration to can rise to block automatically again.
The usage of the S, of L low the usage that block
The automatic gearbox in in is placed in the low blocking the scope on of S or of Ls, can usage under an etc. circumstance.It change to can make use of to launch well into of S or of Ls the mechanism move, avoiding the car wheel system move the machine over hot, cause the system move the effect descent while going down slope.But change into from the of D of S or of L, car soon can't higher than rise to block the car homologously soon, otherwise strong vibration in opportunity to launch, make gearbox oil hoicked, even will damage the gearbox.
The is another at rain fog weather hour, if the road adheres to the term bad, can change into a position for or of L, fixing at somely first lowly blocking driving, doing not use can automatically changing blocking, in order to prevent the car beats slippery.Must keep firmly in mind at the same time, beat the slippery hour can will choose to block the pole pushes into a motive for, cutting off launching machine, toing guarantee a car the safety.