1、設計題目 設計驅動離心鼓風機的V帶傳動 機械 院（系） 車輛工程 專業(yè)班級 093 學號 設計人 指導教師 完成日期 2010 年 5 月 22 日目錄一設計任務書····································&#

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23、3;·····················7設 計 計 算 及 說 明結 果一、設計任務書1.總體布置主動輪1裝在電動機軸上，從動輪2裝在鼓風機軸上，兩帶輪中心的水平距離a等于大帶輪直徑的2倍。簡圖如右圖所示2.原始數據電動機型號：Y112M-4鼓風機轉速n2(r/min): 1440一天工作時間（h）：163.設計要求（1）繪制小帶輪裝配圖一張（2）編寫設計計算說明書一份4.設計內

24、容（1）V帶傳動的設計帶的型號、根數、長度，帶輪尺寸，帶傳動中心距，作用下周上的壓力（2）V帶輪的結構設計帶輪的材料、結構型式，計算基本結構尺寸等。二、V帶傳動的設計由已知的電動機型號Y112M-4，查參,可得電動機的額定功率P=4kw,滿載轉速=1440r/min，傳動裝置應有的傳動比i=1.92，每天工作16小時1.確定計算功率Pc由參考表9-6（p230）查得工作情況系數KA=1.1，故2.選擇V帶的帶型根據Pc和小帶輪轉速由圖9-11（P229）選用A型。3.確定帶輪的基準直徑并驗算帶速v（1）初選小帶輪的基準直徑dd1，由P230的表9-7，可取小帶輪的基準直徑dd1=150mm。=

25、i×dd1=288mm再由表9-7基準直徑系列選=280mm。取=0.015，則實際傳動比i=1.90，傳動比偏差為1.04%。（2）驗算帶速v因為5m/s<v<25m/s，故帶速合適。4.確定V帶的中心距a和基礎長度Ld初選中心距為0.7×（）2×（）。得301860.所以初選=550.由P219的表9-2選帶的基準長度Ld=1800mm則實際中心距中心距的變化范圍527.5608.5mm而題目要求所以取a=560mm，留出適當的中心距調整量。5.驗算小帶輪上的包角1>符合包角要求6.計算帶的根數Z(1)計算單根V帶的額定功率由dd1=150m

26、m和=1440r/min，由 P226頁的表9-3得P0=2.5kw根據=1440r/min，i=1.92和A型帶，由 P227頁的表9-5得P0=0.15kw參考書目P227頁的表9-4得K=0.968，P219頁的表9-2得KL=1.01(2)計算V帶的根數z取3根7.計算單根V帶的初拉力的最小值（F0）min由參考書目表9-1得A型帶的單位長度質量q=0.1kg/m應使帶的實際拉力F0>（F0）min8.計算壓軸力壓軸力的最小值為三、V帶輪的結構設計1.帶輪的材料由于帶速v=11.3m/s<30 m/s，選擇HT1502.帶輪的結構形式（1）小帶輪的結構形式選擇小帶輪的基準直

27、徑dd1=150mm，其軸孔直徑需根據電動機的外伸軸尺寸決定，由機械設計手冊查的，安裝小帶輪軸直徑d=28mm，當2.5d300mm時，帶輪常采用腹板式帶輪結構。取d1=52mm，由參考書目P220頁的圖9-5查的選擇腹板式。（2）大帶輪的結構形式選擇=280<300mm選擇腹板式3.帶輪的基本結構尺寸（1）小帶輪的基本結構尺寸由參考書目P220頁的圖 9-5和P218表9-1，得A型帶的輪槽尺寸：節(jié)寬、基準線上的槽深、基準線下的槽深、槽間距、第一槽對稱面至端面的距離輪緣厚、輪槽角帶輪寬B=（z-1）×e+2f取、取50mm外徑、基準直徑帶輪孔、(2)大帶輪的基本結構尺寸由參考書目P220頁的圖 9-5和P218表9-1，得A型帶的輪槽尺寸：節(jié)寬、基準線上的槽深、基準線下的槽深、槽間距、第一槽對稱面至端面的距離輪緣厚、輪槽角帶輪寬B取、外徑、基準直徑取帶輪孔、四、主動帶輪裝配簡圖設計1. 圓頭普通平鍵設計由參考書目P277頁的表11-9電動機直徑28mm，選擇公稱直徑，公稱尺寸，深度軸，轂，取60mm，檢驗鍵連接強度：其中、取