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車輛與動力工程學(xué)院畢業(yè)設(shè)計說明書
柴油動力 SUV汽車車架與制動系統(tǒng)設(shè)計
摘要
本部分設(shè)計是柴油動力 SUV汽車車架與制動系統(tǒng)設(shè)計，根據(jù)本次設(shè)計的任務(wù)分別對不同類型的車架，制動器進行結(jié)構(gòu)型式分析，確定設(shè)計方案。
車架設(shè)計，采用梯形車架，由于車架的作用是增加車身的強度和剛度，以承受彎曲和扭曲載荷。本部分設(shè)計的重點是其結(jié)構(gòu)設(shè)計，重點對其縱橫梁的布置，確定其尺寸參數(shù),在對整車中受最大力的危險截面進行強度，剛度校核，能滿足危險截面的車架的一點也滿足比其受力小的受力截面，給出了強度計算方法并作精確的校核計算，對車架應(yīng)力作了分析，驗證車架強度和剛度合格。
制動系設(shè)計部分，通過制動器的各個主要部件的受力分析及制動力的大小和車輪尺寸確定制動蹄片和制動盤的大小，及制動輪缸的直徑的大小；制動器為前盤后鼓式，即前制動器是浮鉗式制動器，后制動器是領(lǐng)從蹄式制動器，其驅(qū)動機構(gòu)采用雙回路結(jié)構(gòu);駐車制動采用手動駐車，其驅(qū)動機構(gòu)是機械式驅(qū)動機構(gòu)。通過理論的推到計算，并根據(jù)總體參數(shù)和制動器的結(jié)構(gòu)參數(shù)，對該車的制動性能等做細(xì)致的分析。
關(guān)鍵詞：車架 ，制動系統(tǒng)，制動器，行車制動，駐車制動
DIESEL-POWERED SUV CHASSIS AND BRAKING SYSTEM DESIGN
ABSTRACT
This part is designed diesel-powered SUV frame and braking system design, According to the design of the respective tasks of different types of frame, brake structural pattern analysis, design.
Frame design, using ladder frame, the frame is the role of the body to increase strength and rigidity, and to withstand bending and twisting load. This section is designed to focus on the structural design, focusing on its vertical beam settings, to determine its size, on the vehicle in which most vigorously by the dangerous cross-section strength, stiffness Verification, can meet the dangerous section of the frame is also satisfied by the power than its small force cross section, given the strength calculation method for precise calculations and checks made on the frame stress analysis, test the strength and stiffness of the frame qualified.
Brake System Design, Brake through each of the major components of the braking force and Analysis of the size and dimension of the wheel brake pads and brake disc size, and round brake cylinder diameter size; The vehicle brake brakes forms is the former floating caliper brake, the brakes after leading from the foot brake, drive double-loop structure; Parking brake manually in the car, drive a mechanical drive. Through theoretical to the implementation, according to the overall parameters and structural parameters brake, of the car's braking performance so meticulous analysis.
KEY WORDS : frame ,braking system , brakes , service brake ,parking brake
目 錄
第一章 前 言…………………………………………………………………1
第二章 車架設(shè)計……………………………………………………………2
§2.1 概述………………………………………………………………2
§2.2 車架的結(jié)構(gòu)設(shè)計…………………………………………………2
§2.2.1車架的結(jié)構(gòu)型式…………………………………………2
§2.2.2車架的結(jié)構(gòu)設(shè)計…………………………………………4
§2.3 車架的制造工藝及材料……………………………………………6
§2.4 車架的計算…………………………………………………………7
§2.4.1 車架的受載分析……………………………………………7
§2.4.2 車架的設(shè)計計算……………………………………………8
§2.4.3 縱梁的彎矩計算……………………………………………9
§2.4.4 縱梁的抗彎截面系數(shù)的計算……………………………11
§2.4.5 彎曲應(yīng)力計算……………………………………………12
§2.4.6 車架的剛度校核…………………………………………12
§2.5 車架實驗………………………………………………………13
第三章 制動系統(tǒng)設(shè)計………………………………………………14
§3.1 概述……………………………………………………………14
§3.2 制動器的結(jié)構(gòu)設(shè)計……………………………………………15
§3.2.1 鼓式制動器………………………………………………16
§3.2.2 盤式制動器………………………………………………19
§3.3 制動器的設(shè)計計算……………………………………………21
§3.3.1 制動力與制動力分配系數(shù)……………………………………21
§3.3.2 同步附著系數(shù) …………………………………………………24
§3.3.3 前、后輪制動器制動力矩的確定……………………………25
§3.4 制動驅(qū)動機構(gòu)及其設(shè)計計算…………………………………27
§3.4.1 制動驅(qū)動機構(gòu)的形式…………………………………………28
§3.4.2 分路系統(tǒng)………………………………………………………29
§3.4.3 液壓驅(qū)動機構(gòu)的設(shè)計與計算…………………………………30
§3.5 應(yīng)急制動和駐車制動的計算………………………………………31
§3.5.1 應(yīng)急制動………………………………………………………32
§3.5.2 駐車制動………………………………………………………32
§3.6 制動器主要零件的結(jié)構(gòu)設(shè)計……………………………………33
第四章 總 結(jié)………………………………………………………………38
參考文獻…………………………………………………………………39
致 謝………………………………………………………………………40
IV