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摘要

Abstract

The chassis is the main structure of the pure electric independentdrive recreational vehicle.Most parts of the electric vehiclehave to rely on the chassis to be fixed and connected.The main part of it is bear the overall vehicle load, also is the key component of the entire electric recreational vehicle. Therefore, the chassis structure should have the enough yield strength and the ultimatelimit stiffness.It should be complete with enough properties in response to external pressure generated when the corresponding dynamic characteristics, in order to reduce the vibration intensity of the vehicle. The main structure of performance directly determines the lateral stability performance of pure electric vehicles on the road surface, the steering wheel steering safety performance, and the internal passenger of the cab or thecarriage ride comfort permanenceon the uneven road conditions above.

The chassis system of the pure electric recreationalvehicle and the traditional recreationalvehicle is different from the other parts in addition to the engine, transmission and transmission system, the other parts of the chassis are approximately about the same. The main purpose of the chassis is to support all parts of the vehicle, such as the vehicle head, vehicle frame and vehiclecarriage, and other components of the fixedvehicle, soas to form a whole integrated structure. At the same time,the electric energy in the powerbattery is transmitted to the motor controller, and the wheel is directly driven by the wheel hub motor to drive thevehicle forward.

First of all, this thesis adopt the parameter requirements of this subject and the prerequisite for reference of similar models under the calculating parameters of electric recreationalvehicle chassis design independently, while the completion of the dimension type system requirements is related to the chassis structure. Then I have finished the 3D solid modeling and the assembly of various parts of the overall structure of the chassis with CATIA software, and then view of the effect on the overall structure of the appearance of a recreationalvehicle chassis was modified, while the completion of the three-dimensional modeling into two-dimensional drawings of the operations, in order to determine the overall structure of pure electric vehicle chassis and the corresponding to the design drawings.By the end of the basic parameters on the vehicle chassis 3D models and 2D drawings of the control and research, it can be found and modifiedin the structure design flaw, and perfect chassis overall structure design plan, to ensure that the actual production can be successfully completed.

Keywords: pure electric vehicle chassis design;3D modeling; parameter design

Contents

Chapter 1 Introduction    1

1.1Introduce the basic structure of chassis    1

1.2Chassis design principle    1

1.3Three types of chassis selection    2

Chapter 2 Determine the main parameters of chassis    6

2.1Determination of dimensional parameters    6

2.1.1 Overall dimension    6

2.1.2 Wheelbase    6

2.1.3 Front and rear track    7

    2.1.4 Front and rear suspension    7

2.1.5 Ground clearance    8

2.1.6 Minimum turning radius    8

  2.2 Determine the quality parameters    8

2.2.1 Complete vehicle kerb mass    8

2.2.2 Loading quality    9

    2.2.3 Quality coefficient..........................................................................................................9

    2.2.4 Axle load distribution......................................................................................................9

Chapter 3 The main structure and selection of recreational vehicle..............................................11

3.1Motor selection    11

    3.1.1According to maximum speed    12

    3.1.2 According to acceleration time.....................................................................................12

    3.1.3 According to maximum climbing grade.......................................................................13

    3.1.4 According to the performance of motor........................................................................13

3.2Motor controller selection    14

3.3Power battery selection    15

3.4Drive form selection    16

3.5Suspension system selection    16

3.6Tire selection    17

3.7Brake system selection    17

  3.8 Steering system selection.....................................................................................................18

Chapter 4Overall calculation and analysis of recreational vehicle    19

4.1The calculation of dynamic performance    19

4.1.1Maximum speed    19

4.1.2 Acceleration time    20

4.1.3Maximum climbing grade    20

4.2The calculation of braking performance    21

4.2.1 Braking performance    21

4.2.2Brake deceleration calculation    21

4.2.3Braking torque calculation    22

4.3The calculation of steering performance    22

4.3.1 Steering gear selection    22

4.3.2Maximum rotation angle    22

4.3.3Maximum internal wheel angle    22

4.3.4 Minimum turning radius    23

Chapter 5CATIA modeling    24

5.1Chassis cab modeling    24

5.2Suspension modeling    24

5.3Motor modeling    25

Chapter 6Finite element analysis of frame    26

 6.1 Frame modeling.....................................................................................................................26

 6.2 Geometric models..................................................................................................................26

 6.3 Meshpartition........................................................................................................................26

 6.4 Frame load analysis...............................................................................................................27

    6.4.1Static load.....................................................................................................................27

    6.4.2 Dynamic load................................................................................................................27

  6.5 Fully loaded bending condition of analysis.........................................................................28

Chapter7 Conclusion and prospect    30

7.1 Conclusion    30

7.2 Prospect    30

References......................................................................................................................................32

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