变传动比齿轮齿条转向器(含CAD零件图装配图)(英文版)

变传动比齿轮齿条转向器(含CAD零件图装配图)(英文版)(任务书,开题报告,文献摘要,外文翻译,论文说明书英文版12000字,CAD图纸5张)
Abstract
This graduation design mainly carries on the design variable transmission gear rack steering gear. First, the size of steering trapezoid was calculated and checked. Understand the structural characteristics, layout forms and dynamic output forms of different types of steering gear. After comparison, determine the overall structure scheme and layout forms.According to the trapezoidal arm checking result and the variable transmission ratio curve, the dimension parameters of the rack and pinion are calculated and calculated, including the selection of the gear rack material, the force analysis, and the strength check. For the structural dimensions that are not designed in the steering system, the reference structure is used to design the structure; the assembly dimension chain is established on the gear shaft, precision design, modeling and finite element analysis of the gear shaft are performed; Three-dimensional modeling, and finally draw two-dimensional engineering drawings. [资料来源：http://THINK58.com]
Key words: steering gear, variable transmission ratio, design calculation, strength check
 

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Catalogue
Abstract    1
1.Introduction to steering system and rack and pinion steering gear    1
1.1 Foreword and the purpose and significance of the topic selection    1
1.2 Development status at home and abroad    2
1.3 Introduction to steering system and rack and pinion steering gear    3
1.3.1 Steering system overview    3
1.3.2 Classification of rack and pinion steering gears    5 [资料来源：http://think58.com]
1.3.3 Advantages of Variable Transmission Ratio Rack and Pinion Steering Gear    8
2、Variable transmission ratio rack and pinion steering gear  principle    8
2.1 Transmission ratio introduction and change characteristics    8
2.2 Transmission principle of gear rack commutator with variable transmission ratio    11
2.3 Gear parameter design and installation of staggered angles    14
3.Three-dimensional modeling method for gears and racks    17
3.1 Study on Mathematical Modeling Method of Rack Face of Variable Transmission Ratio    17
3.2 Two methods of comparative analysis    24
4、Steering gear rack design calculation process    25
4.1 Selected models and parameters    25
4.2 Preliminary determination of the size of steering trapezoidal mechanism    27
4.2.1 Steering gear in-situ steering resistance torque calculation    28

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4.2.2 Calculation of average angular transmission ratio of steering gear    29
4.2.3 Maximum force on the steering wheel Fh    29
4.2.4 The maximum torque acting on the steering wheel    30
4.2.5 Turn to maximum resistance Fw    30
4.2.6 Average transmission ratio of steering gear ip    30
4.3  Design of rack and pinion steering gear    30
4.3.1 Design requirements of gear rack type steering gear and design ideas of variable transmission ratio gear rack    31
4.3.2 The parameters of the gear and the rack of ab segment are selected    32
4.3.3 Calculation of the Size of Gear Rack    35
5、Gear strength check    38
5. 1 Check the contact fatigue strength of gears with minimum transmission ratio    38
5.2 Calculation of tooth root bending fatigue strength    40 [来源：http://think58.com]
5.3 Gear shaft accuracy design    41
5.3.1 Gear shaft structure    41
5.3.2 Precision design    42
5.3.3 Gear shaft with dimension chain    43
5.4 Gear shaft strength check    47
Force analysis of gear shaft    47
5.5 Analyze the results    52
5.5.1 Check the property sheet of ANSYS material to get the property of 40Cr and establish the 40Cr material library    53
5.5.2 Import the pinion shaft, select 40Cr material, and mesh    53
5.5.3 Apply a constraint to the shaft and apply a load    54
6、Design of clearance adjustment spring    56
6.1 Selection of clearance adjustment spring material    56
6.2 Initial adjustment and calculation of clearance adjustment spring wire diameter    56
6.3 Calculation of the effective number of laps and free height of the clearance adjustment spring    58 [版权所有：http://think58.com]
6.4  Clearance adjustment spring other structural parameters calculation.    59
6.5 Clearance adjustment spring checking    60
6.5.1 Clearance adjustment spring stability check    60
6.5.2 Checking fatigue adjustment of clearance adjustment spring    60
6.5.3 Clearance spring adjustment spring static strength check    61
6.6 Parameters of the spring    61
7.other parts of the selection and lubrication method to determine    63
7.1 Selection of Bearings    63
7.2 Selection of Lubrication Methods and Lubricants    65
Conclusion    66
References    67
THANKS    68