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小型四輪山地自行車的設(shè)計(jì)說(shuō)明書.docx

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 摘  要

山地自行車源于美國(guó)，是美國(guó)青年為了尋求刺激，在摩托車比賽的越野場(chǎng)地上駕駛自行車進(jìn)行花樣比賽而派生發(fā)展起來(lái)的車型。小型四輪山地自行車的設(shè)計(jì)時(shí)一門專業(yè)的學(xué)科，國(guó)外山地自行車工業(yè)發(fā)達(dá)的國(guó)家都在自行車中投入大量人力，物力和財(cái)力，也取得了很好的效果。我國(guó)雖然被成為自行車生產(chǎn)王國(guó)，但在產(chǎn)品設(shè)計(jì)工作上與國(guó)外先進(jìn)水平相比還存在差距。

小型四輪山地自行車是山地自行車的一類，小型四輪山地自行車的設(shè)計(jì)涉及到大量的技術(shù)問(wèn)題。本次畢業(yè)設(shè)計(jì)中通過(guò)研究小型四輪山地自行車的工作原理，初步確定了自行車車架結(jié)構(gòu)尺寸并對(duì)其進(jìn)行了強(qiáng)度校核，選擇了車架材料，確定了車架的焊接工藝，設(shè)計(jì)計(jì)算了鏈傳動(dòng)，選擇了關(guān)鍵零件并做了相關(guān)計(jì)算，選擇了山地自行車的輪胎，并說(shuō)明了小型四輪山地自行車日常生活中的維護(hù)，然后用ug進(jìn)行了建模，并用CAD進(jìn)行了修改。

關(guān)鍵詞：小型四輪山地自行車；車架材料強(qiáng)度校核；焊接工藝；鏈傳動(dòng)；ug建模

ABSTRAKT

Mountain bikes from the United States, is seeking to stimulate young americans, in the motorcycle race off-road driving bicycles in the field of pattern match and derived developed models. Small four-wheel mountain bike design as a professional discipline, mountain bike industry developed countries abroad are in bicycle invest a lot of manpower, material and financial resources, also has obtained the good effect. Although China is becoming a kingdom of bicycle production, there is a gap in product design work compared to the advanced level of foreign countries.

Small four-hill mountain bikes are a category of mountain bikes, and the design of small four-wheel-mountain bikes involves a lot of technical problems. This graduation design by studying the principle of small four-wheel mountain bike, preliminarily determines the bicycle frame structure size and the intensity, the selected frame material, determine the welding technology of frame, design calculation of the chain drive, select the key parts and do the related calculation, choose the mountain bike tires, and illustrates the small four-wheel mountain bike maintenance in everyday life, and then use ug to the modeling, with CAD were modified.

Keywords: small four-hill mountain bikes;  Strength check of frame materials; Welding process;  Chain drive; Ug modeling

目  錄

1 緒論 1

1.1 研究的背景及意義 1

1.2 國(guó)內(nèi)外山地自行車研究動(dòng)態(tài)及存在的問(wèn)題 1

1.2.1國(guó)內(nèi)山地自行車研究動(dòng)態(tài)及存在問(wèn)題 1

1.2.2國(guó)外山地自行車研究動(dòng)態(tài)及存在的問(wèn)題 2

2 小型四輪山地自行車概述及工作原理 4

2.1 山地自行車的概述 4

2.2 小型四輪山地自行車結(jié)構(gòu)及工作原理 5

3 四輪山地自行車車架材料的選擇及結(jié)構(gòu)設(shè)計(jì) 6

3.1 四輪山地自行車車架介紹及材料的選擇 6

3.2 鋁合金概述 8

3.2.1鋁合金的性能特點(diǎn) 8

3.2.2車架鋁合金的研究現(xiàn)狀 9

3.3 小型四輪山地自行車車架結(jié)構(gòu)設(shè)計(jì) 9

3.3.1小型四輪山地自行車車架尺寸設(shè)計(jì) 10

3.3.2車架強(qiáng)度計(jì)算 11

4 小型四輪山地自行車車架焊接工藝 12

4.1 鋁合金車架焊接方法的選擇 12

4.2 氬弧焊的分類及材質(zhì) 13

4.3 焊接準(zhǔn)備 14

4.4 焊接操作方法 14

4.5 焊后檢驗(yàn) 15

5 鏈傳動(dòng)設(shè)計(jì) 16

5.1 鏈傳動(dòng)特點(diǎn)及應(yīng)用 16

5.2 滾子鏈結(jié)構(gòu)及鏈傳動(dòng)的參數(shù)選擇 16

5.3 鏈傳動(dòng)的失效形式 18

5.4 滾子鏈傳動(dòng)的設(shè)計(jì)計(jì)算 18

6 關(guān)鍵零件結(jié)構(gòu)設(shè)計(jì)及強(qiáng)度計(jì)算 20

6.1 彈簧的設(shè)計(jì) 20

6.1.1彈簧的類型及選擇 20

6.1.2彈簧的設(shè)計(jì)及計(jì)算 20

6.2 軸承的選擇及壽命計(jì)算 21

6.3  十字軸萬(wàn)向聯(lián)軸器的選擇及載荷計(jì)算 23

6.3.1 十字萬(wàn)向節(jié)選擇 23

6.3.2十字萬(wàn)向聯(lián)軸器載荷計(jì)算 24

6.4 傳動(dòng)軸的強(qiáng)度校核 24

7小型四輪山地自行車車輪的選擇 26

8 小型四輪山地自行車維護(hù) 29

參考文獻(xiàn) 30

致謝 31