Graduation Design (Dissertation) of Wuhan University of Technology

Design of braking system for 1.6 liter car

(School):Wuhan University of Technology

Specialty amp; Class:vehicle engineering 1302

Student name:He Fan

Tutor: Han aiguo

Statement of Originality

I solemnly declare that the thesis I submit is a piece of writing I completed independently based on my own research under the guidance of my supervisor. Except for the quotations, this paper does not include any writings published or completed by other individuals or groups. I am fully aware that the legal consequences of this statement are borne by me.

Signature of the author: He Fan

Date: May 30, 2017

Copyright Letter of Authorization to The Dissertation

The author of this dissertation fully understands provisions stipulated by this school on keeping and using dissertations. The author agrees that the school can reserve and send photocopies and electronic versions of this thesis to relevant departments or institutions managing dissertations. This thesis can be read and borrowed. I hereby authorize excellent provincial institutions appraising bachelor dissertations to incorporate all or any part of this dissertation into relevant databases for retrieval, as well as to preserve and compile this dissertation by photocopying, scanning or reprinting it in a reduced format.

This dissertation is: 1. Confidential until(year) and then this authorization letter will apply. 囗

2. Non-confidential. 囗√

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Signature of the author: He Fan

Date : May 30, 2017

Signature of the tutor:

Date

ABSTRACT

The braking system of is a very important part of the car. The frequent occurrence of traffic accidents is inseparable from the braking system. Taking into account the safety of motor vehicles, we have to improve the performance of the brake system as the starting point of the design.

Having understood the design requirements and functions of the brake system, we analyze the scheme according to the given parameters. After considering many factors, we choose the form of the floating caliper disc brake. This form is beneficial to both the braking performance and the stability of the braking performance. Then, the specific structure of disc brake and the materials are determined.

In this paper, the structure of the automobile brake system and the design and calculation of the main components are introduced in detail. The main parameters of the brake system and their selection, the analysis and calculation of the main parts of the brake, the type selection and design calculation of the brake drive mechanism are expounded.

Key words: Brake system, Disc brake, Hydraulic drive, Brake actuating mechanism

Content

Abstract

1 Introduction

1.1 The purpose and significance of this design.........................................1

1.2 Research status at home and abroad.....................................................1

1.3 Research methods.................................................................................2

1.4 The main content of the design.............................................................2

2 The design scheme of brake system

2.1 Selection of brake drive mechanism.....................................................3

2.2 Structure selection of brake..................................................................4

2.3 The arrangement of the brake line........................................................4

2.4 Summary of this chapter.......................................................................5

3 Determination of the main parameters of the brake system

3.1 The basic parameters of the car............................................................6

3.2 Selection of main parameters of disc brake..........................................6

3.2.1 brake disc diameter (D).....................................................................6

3.2.2 brake disc thickness (h).....................................................................7

3.2.3 the friction lining block outer radius (R₂) and the internal radius (R₁)..............................................................................................................7

3.2.4 Working area (A) of the brake pad....................................................7

3.3 Determine the friction coefficient(f) of the brake pad..........................7

3.4 Determine the coefficient of synchronous adhesion.............................8

3.5 Determine the maximum braking torque of the brake..........................9

3.6 Summary of this chapter.....................................................................10

4 The design and calculation of brake

4.1 Calculating braking torque of the brake.............................................11

4.2 Calculating the wear characteristics of friction pads..........................12

4.3 determine the braking torque required for emergency braking and parking brake............................................................................................13

4.4 Summary of this chapter.....................................................................15

5 Structure design of main parts of brake