120吨电机车行走齿轮齿根强化装置设计含6张CAD图+说明书

A总装图

120吨电机车行走齿轮齿根强化装置设计
摘要
齿轮传动的主要失效形式分为轮齿折断，齿面磨损、齿面点蚀、齿面胶合跟塑性变形五大类，而引起120吨电机车行走齿轮失效的原因主要有：一是120T电机车行走齿轮正常受载时，齿根处所产生的弯曲应力最大，当齿轮重复受重载荷后，齿根处会出现疲劳裂纹，逐步扩展导致轮齿断裂；二是120T电机车在运行过程中承受的是变载荷，所以轮齿有时会因意外的过载发生过载折断。电机车行走齿轮用淬火钢制成，多用于采矿等作业，工作载荷大，主要承受弯曲应力，易发生断齿。
因此为了提高轮齿的抗疲劳强度，增加强抗折断能力，可采取的措施有：一是增大齿根过度圆角半径和消除加工刀痕来减小齿根应力集中；二是增大轴及支承的刚性，使轮齿接触线上受载均匀；三是对轮齿表面进行热处理提高材料性能；四是采用喷丸、滚压等工艺对齿根进行强化处理。针对20吨电机车行走齿轮，对比之后本设计采用第四种方法对齿轮齿根进行强化，加强齿根的抗弯曲强度，提高轮齿的抗折断能力。
本设计首先介绍了选题的目的跟意义及目前的研究状况跟发展趋势；之后就开始组建机构，总体包括减速器（高速级、中间级、低速级）、工作台、横竖向液压缸及被加工齿轮几个部分组成，并对各个部分进行计算或选型；最后校核看啮合部分和各轴是否满足要求。

关键词：轮齿折断；电机车齿轮；齿根弯曲强度；强化装置

ABSTRACT
The main failure forms of gear transmission can be divided into broken tooth, Main failure forms of gear transmission can be divided into broken tooth, tooth surface wear, tooth surface erosion, tooth surface glue with five classes, plastic deformation caused by the 120 tons of electric locomotive walking gear failure reason mainly has: one is the 120 t electric locomotive walking gear normal load, tooth root bending stress of the largest space, when the gear handles repeated load, tooth root place will appear fatigue crack, gradually extend the lead to tooth fracture; The second is in the process of 120 t electric locomotive running under variable load, so the tooth sometimes due to accidental overload fracture. Electric locomotive walking gear with quenching steel, used in mining operations, work load big, mainly bear bending stress, prone to broken teeth.
So in order to improve the fatigue strength of gear tooth, increase the strong ability to resist breaking, measures taken are: to increase one is excessive tooth root fillet radius and the elimination of machining tool to reduce the tooth root stress concentration;2 it is to increase the rigidity of shaft and bearing online uniformly loaded tooth contact; Three is on the surface of gear heat treatment to improve material performance; Four is the shot peening, rolling process to strengthen the tooth root. After walking for 20 tons of electric locomotive gear, comparing the design adopts the fourth kind of method for gear tooth root reinforcement, strengthening the tooth root bending strength, improve the fracture resistance of teeth.
With the purpose of this design first introduced the selected topic significance and the current research status and development trend; After began to establish institutions, including overall speed reducer (high level, middle level and low level), workbench, the relation to the hydraulic cylinder and the gear machining parts, and a calculation is made for each part or selection; The last check the mesh part and the axis whether meet the requirements.
Key Words: tooth broken; Electric locomotive gear; The tooth root bending strength; Strengthen the device

目录
摘要I
ABSTRACT II
1绪论1
1.1选题背景1
1.2目前研究的概况和发展趋势1
1.3齿轮强化技术分类1
2组建机构模型4
2.1确立主体结构4
2.2分析主体运动4
3主要的参数选择5
3.1选择工作台参数5
3.2系统总效率计算5
3.3其他参数选择5
4减速机构设计7
4.1系统传动比的分配7
4.2传动系统运动和有关参数计算7
4.3高速级齿轮设计8
4.4低速级齿轮设计12
4.5轴与轴承16
4.6设计蜗轮蜗杆20
4.7设计离合器23
4.8键的选择25
4.9操纵件部分26
5设计滚压机构29
5.1确定齿根形状29
5.2滚压力大小的确定29
5.3滚压速度的确定30
6设计液压系统31
6.1运动分析31
6.2设计横向油缸31
6.3设计纵向油缸32
6.4拟定系统的原理图34
6.5具体工作情况35
6.6选择液压元件36
7结论38
参考文献39
致谢40

大齿轮

剖视图

蜗杆

蜗轮

液压图

设计所包含文件

字数统计