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車輛與動力工程學(xué)院畢業(yè)設(shè)計說明書
三噸柴油動力貨車設(shè)計（變速器及操縱機(jī)構(gòu)設(shè)計）
摘要
我設(shè)計的是題目是輕型貨車的變速器及其操縱機(jī)構(gòu)，發(fā)動機(jī)選用CY4D43T，主要任務(wù)是協(xié)助總體設(shè)計人員完成外形和總體布置方案，獨立完成變速器及其操縱機(jī)構(gòu)的設(shè)計。
變速器用于改變發(fā)動機(jī)的曲軸的轉(zhuǎn)矩及轉(zhuǎn)速，以適應(yīng)在起步、加速、行駛以及克服各種道路障礙等不同行駛條件下對驅(qū)動車輪牽引力及車速的不同要求的需要。
在設(shè)計開始時，根據(jù)發(fā)動機(jī)給定的轉(zhuǎn)速和設(shè)計所要求的車速來求出總傳動比，然后初步確定主減速器的傳動比，以及變速器的各檔傳動比，通過轉(zhuǎn)矩來確定中心距，用初選的傳動比來確定各齒輪的詳細(xì)參數(shù)，之后確定實際傳動比，并核算各齒輪是否滿足彎曲強度和疲勞強度的要求，在畫圖過程中確定軸的實際尺寸和軸承的布置位置，然后計算軸的強度是否滿足要求，之后通過轉(zhuǎn)矩等條件計算各軸承的壽命。最后是把收集的外文資料進(jìn)行翻譯。
關(guān)鍵詞：變速器，轉(zhuǎn)速，傳動比，強度。 THREE TONS OF DIESEL-POWERED VEHICLE DESIGN(TRANSMISSION AND MANIPULATION OF DESIGN)
Abstract
I design is the subject of a light goods vehicle transmission and manipulation of institutions，engine choice CY4D43T，main task is to help shape and design to complete the overall layout scheme，Independent Transmission completed the design and manipulation.
Transmission to change the engine torque and speed of the crankshaft，to meet at the starting to accelerate, on the road and obstacles to overcome all kinds of different driving conditions on the drive wheels, traction and speed the needs of the different requirements.
At the beginning of the design，according to the top of the engine speed and the speed required by the design in order to obtain the transmission ratio，then tentatively determined the main transmission ratio reducer.And the transmission of the file transmission ratio，through the torque to determine the distance，with the primary transmission gear ratio to determine the details of the parameters.After the actual transmission ratio，and whether the accounting of the gear bending strength and fatigue strength to meet the requirements，paint in the process of determining the actual size and shaft bearings of the layout position.Then calculate the strength of the shaft to meet demand.After the torque through the bearings, and other conditions of life calculated。Finally, the data collected by the foreign-language translation。
KEY WORDS：transmission，speed，transmission ratio，strength