【正文】 ork. And the trans mission in neutral gear with reverse gear. Transmission also need power output function. Gearbox because of the lowgrade work at a larger role, In general, the lowgrade gearbox layout are close to the axis after support, Following from lowgrade to highgrade order of the layout of stalls gear. This will not only allow axis are large enough for a rigid, but also ensures easy assembly. Gear box overall structure and rigid axle and the shell structure of relations. Generally through the control shaft length control over several stalls to ensure that adequate gear box rigid. This paper describes the design of threeaxis five block manual trans mission, the transmission principle of work elaborated, Transmission of the gear shaft and do a detailed design, and the intensity of a school. For some standard parts for the selection. Transmission Trans mission program design. A brief description of the trans mission of all ponents of the material choice. Keywords： block。變速器的傳動方案設(shè)計(jì)。一般通過控制軸的長度即控制檔數(shù)，來保證變速箱有足夠的剛性。這樣做既能使軸有足夠大的剛性，又能保證裝配容易。需要時變速器還有動力輸出功能。 I 摘要 變速器用來改變發(fā)動機(jī)傳到驅(qū)動輪上的轉(zhuǎn)矩和轉(zhuǎn)速，作用 是在原地起步，爬坡，轉(zhuǎn)彎，加速等各種行駛工況下，使汽車獲得不同的牽引力和速度，同時使發(fā)動機(jī)在最有利工況范圍內(nèi)工作。變速器設(shè)有空擋和倒擋。 因?yàn)樽兯傧湓诘蜋n工作時 有較大的力，所以一般變速箱的低檔都布置靠近軸的后支承處，然后按照從低檔到高檔順序布置各檔位齒輪。變速箱整體結(jié)構(gòu)剛性與軸和殼體的結(jié)構(gòu)有關(guān)系。 本文設(shè)計(jì)研究 了三軸式五擋手動變速器，對變速器的工作原理做了闡述，變速器的各擋齒輪和軸做了詳細(xì)的設(shè)計(jì) 計(jì)算，并進(jìn)行了強(qiáng)度校核 ， 對一些標(biāo)準(zhǔn)件進(jìn)行了選型。 簡單講述了 變速器中各部件 材料的選擇。 Transmission ratio。 Axis III 目錄 摘要 ...............................................................I 第 1 章 緒論 ........................................................1 第 2 章 變速器傳動機(jī)構(gòu)布置 ........................................2 傳動機(jī)構(gòu)布置方案分析 .............................................................................2 固定軸式變速器 ...............................................................................2 倒擋布置方案 ..................................................................................5 零部件結(jié)構(gòu)方案分析 ...................................................................................6 齒輪形式 ...........................................................................................6 換擋機(jī)構(gòu)形式 ..................................................................................6 變速器軸承 .......................................................................................7 第 3 章 變速器主要參數(shù)的選擇 .......................................9 中心距 A ......................................................................................................9 齒輪參數(shù)的選取 ......................................................................................... 11 模數(shù) ................................................................................................. 11 壓力角 ? ......................................................................................... 11 螺旋角 ? 的選取 ............................................................................12 齒寬 b ..............................................................................................12 齒輪變位系數(shù)的選擇原則 ............................................................13 各擋齒輪齒數(shù)的分配及傳動比的計(jì)算 ...................................................13 確定一檔齒輪的齒數(shù) .....................................................................14 確定常嚙合齒輪副的齒數(shù) .............................................................15 確定其他檔位的齒數(shù) .....................................................................16 確定倒檔齒輪的齒數(shù) .....................................................................16 求各擋齒輪的變位系數(shù)并進(jìn)行修正 ........................................................17 第 4 章 齒輪校核 ..................................................21 計(jì)算各軸的轉(zhuǎn)矩 .........................................................................................22 輪齒強(qiáng)度計(jì)算 .............................................................................................22 直齒輪彎曲應(yīng)力 w? ........................................................................23 斜齒輪彎曲應(yīng)力 w? ........................................................................24 IV 計(jì) 算一 擋齒輪 9， 10 的彎曲應(yīng)力 ................................................25 計(jì)算二檔齒輪 7， 8 的彎曲應(yīng)力 ..................................................26 齒輪接觸應(yīng)力 j? ..........................................................................26 計(jì)算一檔齒輪 9， 10 的接觸應(yīng)力 ................................................27 計(jì)算二檔齒輪 7， 8 的接觸應(yīng)力 ..................................................28 計(jì)算倒檔齒輪 11 與齒輪 9 接觸 應(yīng)力 ..........................................28 第 5 章 軸的設(shè)計(jì)及校核 ..........................................30 軸的工藝要求 .............................................................................................30 軸的強(qiáng)度計(jì)算 .............................................................................................30 初選軸的直徑 ..........................................................................................30 軸的結(jié)構(gòu)設(shè)計(jì) .................................................................................31 一擋齒輪的各個分力 .....................................................................31 軸的強(qiáng)度校核 .................................................................................32 軸的剛度校核 .................................................................................32 第 6 章 同步器的選擇 ..............................................34 慣性式同步器 ............................................................................................34 鎖環(huán)式同步器的結(jié)構(gòu) ....................................................................34 鎖環(huán)式同步器的工作原理 .............................................................35 鎖環(huán)式同步器主要尺寸的確定 ....................................................36 主要參數(shù)的確定 .........................................................................................37 摩擦因數(shù) f .......................................................................................37 同步環(huán)主要尺寸 的確定 .................................................................37