轎車(chē)變速箱設(shè)計(jì)

摘 要

本設(shè)計(jì)的任務(wù)是設(shè)計(jì)一臺(tái)用于轎車(chē)上的FR式的手動(dòng)變速器。本設(shè)計(jì)采用中間軸式變速器，該變速器具有兩個(gè)突出的優(yōu)點(diǎn)：一是其直接檔的傳動(dòng)效率高，磨損及噪聲也最小；二是在齒輪中心距較小的情況下仍然可以獲得較大的一檔傳動(dòng)比。 ?????????????????

根據(jù)轎車(chē)的外形、輪距、軸距、最小離地間隙、最小轉(zhuǎn)彎半徑、車(chē)輛重量、滿載重量以及最高車(chē)速等參數(shù)結(jié)合自己選擇的適合于該轎車(chē)的發(fā)動(dòng)機(jī)型號(hào)可以得出發(fā)動(dòng)機(jī)的最大功率、最大扭矩、排量等重要的參數(shù)。再結(jié)合某些轎車(chē)的基本參數(shù)，選擇適當(dāng)?shù)闹鳒p速比。根據(jù)上述參數(shù)，再結(jié)合汽車(chē)設(shè)計(jì)、汽車(chē)?yán)碚摗C(jī)械設(shè)計(jì)等相關(guān)知識(shí)，計(jì)算出相關(guān)的變速器參數(shù)并論證設(shè)計(jì)的合理性。

它功用是：①改變傳動(dòng)比，擴(kuò)大驅(qū)動(dòng)輪轉(zhuǎn)矩和轉(zhuǎn)速的變化范圍，以適應(yīng)經(jīng)常變化的行駛條件，如起步、加速、上坡等，同時(shí)使發(fā)動(dòng)機(jī)在有利的工況下工作；②在發(fā)動(dòng)機(jī)旋轉(zhuǎn)方向不變的前提下，使汽車(chē)能倒退行駛；③利用空檔，中斷動(dòng)力傳遞，以使發(fā)動(dòng)機(jī)能夠起動(dòng)、怠速，并便于發(fā)動(dòng)機(jī)換檔或進(jìn)行動(dòng)力輸出。這臺(tái)變速器具有五個(gè)前進(jìn)檔（包括一個(gè)超速檔五檔）和一個(gè)倒檔，并通過(guò)鎖環(huán)式同步器來(lái)實(shí)現(xiàn)換檔。

關(guān)鍵詞：變速器，鎖環(huán)式同步器，傳動(dòng)比，中間軸，第二軸，齒輪

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The design of saloon?gearbox?

ABSTRACT

The duty of this design is to design a FR type manual transmission?used?in the saloon,It’s?the countershaft-type transmission gearbox.This transmission has two?prominent merits: Firstly,the transmission efficiency?of?the direct?drive?keeps off high, the attrition and the noise are also?slightest;Secondly ,it’s allowed to obtain in?the?biger gear?ratio?of the first?gear when the center distance?is smaller.

According to the contour,track，wheel base，the smallest ground clearance,the smallest turning radium,the vehicles weight, the all-up weight as well as the highest speed and so on, union the choosing?engine model we can obtain the?important parameters?of the?max power,the max torque, the displacement and so on. According to the basic parameters of the certain?saloon,choose?the suitable?final drive ratio.According to the above parameters,combining the?knowledge?of automobile design, automobile theory, machine design and so on,?calculate the correlated?parameters?of the gearbox and proof the rationality of the design.?

Its function is:①Changing?gear?ratio,expanding?the torque of the driving?wheel and the range of the rotational speed,to adapt the?travel condition which frequently changes, like start, acceleration,?climbing?and so on, simultaneously causes the engine to work under the?advantageous operating mode;②Under the premise of the invariable rotation, enables the automobile to travel?back;③Using neutral, severances?the power transmission, to make?the engine start, idle, and is advantageous for the engine to shift gears or?to carry on the dynamic output. This gearbox has five?(including?over?drive—fifth gear) and a?reverse gear, and through the inertial type of synchronizer?to realize?shift gears.

Key?wordS：transmission,?inertial type of synchronizer,gear?ratio,?countershaft,second axis, gear

目 ?錄

符號(hào)說(shuō)明................................................... 1

前言....................................................... 3

• ?機(jī)械式變速器的概述及其方案的確定.................?6

§1.1 變速器的功用和要求............................... 6

§1.2 變速器結(jié)構(gòu)方案的確定............................. 6

§1.3 變速器主要零件結(jié)構(gòu)的方案分析....................?12

• ?變速器主要參數(shù)的選擇與主要零件的設(shè)計(jì)............ 15

§2.1 變速器主要參數(shù)的選擇............................ 15

§2.2 各檔傳動(dòng)比及其齒輪齒數(shù)的確定....................?19

§2.3 齒輪變位系數(shù)的選擇.............................. 21

• ?變速器齒輪的強(qiáng)度計(jì)算與材料的選擇................ 22

§3.1 齒輪的損壞原因及形式............................ 22

§3.2 齒輪強(qiáng)度計(jì)算與校核.............................. 22

• ?變速器軸的強(qiáng)度計(jì)算與校核........................ 25

§4.1 變速器軸的結(jié)構(gòu)和尺寸............................ 25

§4.2 軸的校核........................................?27

• ?變速器同步器的設(shè)計(jì).............................. 30
• ?變速器的操縱機(jī)構(gòu)................................ 33

結(jié)論......................................................34

參考文獻(xiàn)..................................................35

致謝......................................................36

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