【正文】 強度校核 因傳動無嚴(yán)重過載，故不作靜強度校核 減速器外部零件的設(shè)計計算 普通 V形帶傳動 選擇帶的型號 查表 6－ 4 得 ? , 則計算功率為 PC=KA（ d1+d2） ≤0a 0≤20a ) = 查 6－ 2 表，按標(biāo)準(zhǔn)選帶的基準(zhǔn)長度Ld=1800mm 的實際 中心距 a=a0+(LdL0)/2= 取圓整a=643mm 驗算小帶輪上的包角 α1 α1=180(d2d1) 120 小輪包角合適 確定帶的根數(shù) 由式 ? ?11cLPz P P K K?? ?? 確定 V 帶根數(shù)， 查 6－ 3 表得 1P ＝ ，查 6－ 7 表得 1P? ＝ 查 6－ 2 表得 LK ＝ ， K? ＝ 則 Z=PC/（ (P0+△ P0)39。 N m m?? 應(yīng)力校正系數(shù) 計算當(dāng)量彎矩 截面 C 是危險 截面 N mm?? 13 受力和彎矩圖 校核 許 用彎曲應(yīng)力 為 2 .2 5eb M M PaW? ?? 符合要求 低速 軸的 設(shè)計與校核 計算項目 計算內(nèi)容 計算結(jié)果 材料的選擇 為 45 號鋼，正火處理，硬度 HB=170~217 估算軸徑 2d =c322Pn =1153 = 加大 3%， d= d=40mm 14 齒輪圓周力 2 ? 齒輪徑向力 2 ? 齒輪軸向力 2 ? 豎直面反力及彎矩 BVF F N?? ? 水平面反力及彎矩 ? ? 39。 N mm?? 39。 計算項目 計算內(nèi)容 計算結(jié)果 軸承主要性能參數(shù) d=40mm， D=80mm， T=， B=18mm kN? kN? 17 軸承受力情況 12rFN?? 附加軸向力 /2 F YY ?? 12sFN?? 軸向載荷 12aFN?? 選 B 端校核軸承壽命 B 端當(dāng)量動載荷 11/ 0 .3 71 .2 ( 0 .4 1 .6 ) 1 3 5 5 .9are r aF F eP F F N??? ? ? ? 軸承壽命 2 5 8 3 4 1 4 4 0 0L s s?? 即壽命大于三年 壽命合格 18 第八章 鍵和聯(lián)軸器的選擇 鍵的選擇 鍵的選擇主要考慮所傳遞的扭矩的大小，軸上零件是否需要沿軸向移動，零件的對中要求等等。對于無相對運動的結(jié)合面，常用密封膠、耐油橡膠墊圈等；對于旋轉(zhuǎn)零件如外伸軸的密封，則需根據(jù)其不同的運動速度和密封要求考慮不同的密封件和結(jié)構(gòu)。 ② 在裝配過程中軸承裝配要保證裝配游隙。 ⑤ 在機蓋機體間，裝配是涂密封膠或水玻璃，其他密封件應(yīng)選用耐油材料。 ⑦ 減速器裝配完畢后要進行空載試驗和整機性能試驗。 22 ⑧ 搬動減速器應(yīng)用底座上的釣鉤起吊。 參考文獻 [1] 王之櫟 ， 王大康 .機械設(shè)計綜合課程設(shè)計［Ｍ］ .北京 : 機械工業(yè)出版社 ， [2] 王之櫟 ， 馬綱 ， 陳心頤 .機 械設(shè)計［Ｍ］ .北京： 航空航天大學(xué)出版社 ， ag an employment tribunal clai Emloyment tribunals sort out disagreements between employers and employees. You may need to make a claim to an employment tribunal if: you don39。re clear about the terms of the agreement. It might be best to get advice from an experienced adviser, for example, at a Citizens Advice Bureau. To find your nearest CAB, including those that give advice by , click on nearest CAB. For more information about making a claim to an employment tribunal, see Employment tribunals. The (lack of) air up there Cay man Islandsbased Webb, the Watch m head of Fifa39。s about how he felt and I would like to speak to him first to find out what his experience was. Uefa has opened disciplinary proceedings against CSKA for the racist behaviour of their fans during City39。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA. Age has reached the end of the beginning of a word. May be guilty in his seems to passing a lot of different life became the appearance of the same day。二十年的人生軌跡深深淺淺，突然就感覺到有些事情，非做不可了。 Then in high school, think don39。 A person39。嫌惡過自己的怯懦，最終卻發(fā)現(xiàn)有很多 緣分 ，有很多錯過，好像冥冥之中真的已經(jīng)注定。 From the corner at the beginning of deep friendship。 Baumgartner the disappointing news: Mission aborted. r plays an important role in this mission. Starting at the ground, conditions have to be very calm winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our daytoday weather lives. It will climb higher than the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles/ kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. We often close ourselves off when traumatic events happen in our lives。下面六個方法有助于你更完滿透徹地敞開心扉。 2. Embrace the unfortable We all know what that twinge of anxiety feels like. We know how fear feels in our bodies: the tension in our necks, the tightness in our stomachs, etc. We can practice leaning into these feelings of disfort and let them show us where we need to ，也都感受過恐懼造成的生理反應(yīng)：脖子僵硬、胃酸翻騰。 3. Ask your heart what it wants 傾聽內(nèi)心 We’re often confused at the next step to take, making pros and cons lists until our eyes bleed and our brains are sore. Instead of always taking this approach, what if we engaged a new part of ourselves that isn’t usually involved in the decision making process?我們常對未來猶疑不定，反復(fù)考慮利弊直到身心俱疲。s not needed. Instead, he plans to deploy his 270squarefoot (25squaremeter) main chute at an altitude of around 5,000 feet (1,524 meters). In order to deploy this chute successfully, he will have to slow to 172 mph (277 kph). He will have a reserve parachute that will open automatically if he loses consciousness at mach speeds. Even if everything goes as planned, it won39。 From: The supersonic descent could happen as early as Sunda. The weatheThe balloon will slowly drift to the edge of space at 120,000 feet (Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform. Below, the Earth bees the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he39。 The initial