This design task is to design a car for five manual shift transmission. Reasonable design and decorate transmission can make the engine power to get the most reasonable use of, so as to improve the dynamic performance and fuel economy cars. Variable speed transmission's main function is to change the torque and speed of numerical and direction; Operation is the main purpose of control transmission mechanism, realize the transmission ratio of the gearbox change, which realize the shift, in order to achieve the change from the speed.
This article refer to the domestic and foreign many papers, and first simply describes the mechanical transmission of the history, the status and effect of the transmission, and discussed its present situation and future development trend. And then we study the basic structure of the mechanical transmission and variable speed principle, which focus on the transmission mechanism (mainly shaft and gear) the basic structure, characteristic and work principle, mechanical transmission of each block transmission line are briefly analyzed. The articles included a large amount of calculation process, and the specific contents: the layout of transmission analysis, the transmission structure paramete determination of turning a synchronizer, the structure and the working principle, each block of the gear axis strength check, the intensity, the service life of the bearings calculations, etc.
Keywords Gear, Shaft, Synchronizer, Three axis five gear
目 錄
摘 要 I
Abstract II
第1章 緒論 1
1.1 本設計的目的和意義 1
1.2 變速器的發展 1
1.3變速器的設計要求 3
1.4設計內容與思路 3
1.4.1設計內容 3
1.4.2設計思路 4
1.5本章小結 4
第2章 變速器的整體結構方案設計 5
2.1變速器傳動機構的型式選擇與結構分析 5
2.1.1變速器傳動方案的比較 5
2.1.2倒檔的布置方案 6
2.2本章小結 7
第3章 變速器主要參數的選擇與齒輪設計 9
3.1變速器主要參數的選擇 9
3.1.1檔位數和傳動比 9
3.1.2中心距 10
3.1.3齒輪模數 11
3.1.4壓力角α、螺旋角β和齒寬b 12
3.1.5齒輪的變位系數 13
3.2各檔傳動比及其齒輪齒數的確定 13
3.2.1確定一檔齒輪的齒數 13
3.2.2確定常嚙合齒輪副的齒數 14
3.2.3確定其他檔位的齒數 15
3.2.4確定倒檔齒輪的齒數 15
3.2.5確定齒輪輪齒尺寸 15
3.3本章小結 16
第4章 變速器齒輪的強度計算與材料選擇 17
4.1齒輪的主要失效形式 17
4.2齒輪的強度計算及材料接觸應力 17
4.2.1齒輪彎曲強度計算 17
4.2.2齒輪材料接觸應力 19
4.3本章小結 21
第5章 變速器軸的設計與校核 22
5.1變速器軸的結構和尺寸 22
5.1.1軸的結構 22
5.1.2軸的尺寸 22
5.2軸的校核 23
5.2.1第一軸的強度與剛度校核 23
5.2.2第二軸的強度與剛度校核 24
5.3本章小結 26
第6章 變速器同步器與操縱機構的設計 27
6.1同步器設計 27
6.1.1同步器的工作原理 27
6.1.2同步環主要參數的確定 28
6.2變速器的操縱機構 30
6.2.1操縱機構的功用 30
6.2.2操縱機構的設計要求 31
6.2.3變速器的換檔位置 32
6.3本章小結 32
第7章 軸承的選用與壽命計算 33
7.1 第一軸軸承選用與計算 33
7.2第二軸軸承選用與計算 33
7.3本章小結 34
結 論 41
致 謝 42
參考文獻 43
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