轿车机械式变速器设计

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轿车机械式变速器设计Transmission to change the engine reached on the driving wheel torque and speed， is aimed at marking start， climbing， turning， accelerate various driving conditions， the car was different traction and speed Meanwhile engine in the most favorable working conditions within the scope of the work. And the trans mission in neutral gear with reverse gear. Transmission also need power output function.Gearbox because of the low-grade work at a larger role， In general， the low-grade gearbox layout are close to the axis after support， Following from low-grade to high-grade 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 three-axis 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 components of the material choice.

Keywords : transmission；Transmission ratio；mechanical；Tooth from；




目 录

摘 要I
AbstractII
1 绪论1
1.1 选题背景及意义1
1.2 汽车参数的选择1
1.3 变速器设计应满足的基本要求2
2 变速器传动机构布置方案3
2.1 传动机构布置方案分析3
2.1.1 固定轴式变速器3
2.1.2 倒挡布置方案3
3 零部件结构方案分析5
3.1 齿轮形式5
3.2 换挡机构形式5
3.3 变速器轴承6
4 变速器设计和计算8
4.1 挡数8
4.2 传动比范围8
4.3 中心距A8
4.4 外形尺寸9
4.5 轴的直径9
4.6 齿轮参数9
4.6.1 模数的选取9
4.6.2 压力角 10
4.6.3 螺旋角 10
4.6.4 齿宽b11
4.7 各挡齿轮齿数的分配12
4.7.1 确定-挡齿轮的齿数12
4.7.2 对中心距进行修正13
4.7.3 确定常啮合传动齿轮副的齿数13
4.7.4 确定其他各挡的齿数14
4.7.5 确定倒挡齿轮齿数14
5 变速器的校核16
5.1 齿轮的损坏形式16
5.2 齿轮弯曲强度计算16
5.3 轮齿接触应力计算18
5.4 轴的强度计算19
6 同步器的选型22
6.1 锁销式同步器23
6.1.1 锁销式同步器结构23
6.1.2 锁销式同步器工作原理23
6.2 锁环式同步器24
6.2.1 锁环式同步器结构24
6.2.2 锁环式同步器工作原理25
6.2.3 锁环式同步器主要尺寸的确定25
结论28
致 谢29
参考文献30
附 录31
附录 外文文献32