【正文】 決心去做某件事，但更多的時(shí)候是最后又打起了退堂鼓。 Those were broken into various shapes of stationery。突然想到那件藍(lán)格子襯衫；那些被折成各種各樣形狀的信紙；那段從街角深巷伊始的友誼；還有那場還沒有開始就宣告 29 了終結(jié)的邂逅 計(jì)劃 …… 那些年那些天的非做不可，終于和青春一樣，都將在我們的人生中謝幕。既然如此，何不嘗試打開心門，擁抱生活中的各種可能，讓世界感化我們呢？ Whenever we start to let our fears and seriousness get the best of us, we should take a step back and reevaluate our behavior. The items listed below are six ways you can open your heart more fully and pletely. 當(dāng)恐懼與焦慮來襲時(shí)，我們應(yīng)該退后一步，重新反思自己的言行。屏住呼吸，生活停滯；呼出呼吸，更多新奇與經(jīng)歷又將拉開序幕。下次感到不安時(shí)，不管有多害怕，也請?jiān)囍赂颐鎸Π伞Ｆ鋵?shí)，我們有能力面對這些痛苦的感受，從中領(lǐng)悟到出路。 Whenever a painful situation arises in your life, try to embrace it instead of running away or trying to mask the hurt. When the sadness strikes, take a deep breath and lean into it. When we run away from sadness that’s unfolding in our lives, it gets stronger and more real. We take an emotion that’s fleeting and make it a solid event, instead of something that passes through us. 當(dāng)生活中出現(xiàn)痛苦的事情時(shí)，別再逃跑或隱藏痛苦，試著擁抱它吧；當(dāng)悲傷來襲時(shí)，試著深呼吸，然后直面它。 instead of letting the world soften us, we let it drive us deeper into ourselves. We try to deflect the hurt and pain by pretending it doesn’t exist, but although we can try this all we want, in the end, we can’t hide from ourselves. We need to learn to open our hearts to the potentials of life and let the world soften us. 生活發(fā)生不幸時(shí)，我們常常會(huì)關(guān)上心門；世界不僅沒能慰藉我們，反倒使我們更加消沉。 Have declared the end of the encounter that haven39。那些曾經(jīng)所謂的非做不可，只是青蔥年華里自己給自己注射的一支強(qiáng)心劑，或者說，是自以為是的精神寄托罷了。s time, your ideas are always special to clear. Want, want, line is clear, as if nothing could shake his. Also once seemed to be determined to do something, but more often is he backed out at last. Dislike his cowardice, finally found that there are a lot of love, there are a lot of miss, like shadow really have been doomed. Those who do, just green years oneself give oneself an arm injection, or is a selfrighteous spiritual. 一個(gè)人的時(shí)候，自己的想法總是特別地清晰。t want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。 The end of our life, and can meet many things really do? 而 窮盡我們的一生，又能遇到多少事情是真正地非做不可？ During my childhood, think lucky money and new clothes are necessary for New Year, but as the advance of the age, will be more and more found that those things are optional。 May be back in the past, to oneself the paranoid weird belief disillusionment, these days, my mind has been very messy, in my mind constantly. Always feel oneself should go to do something, or write something. Twenty years of life trajectory deeply shallow, suddenly feel something, 28 do it. 一字開頭的年齡已經(jīng)到了尾聲。s 21 win. Michel Platini, president of European football39。s antiracism taskforce, is in London for the Football Association39。t agree with the disciplinary action your employer has taken against you your employer dismisses you and you think that you have been dismissed unfairly. For more informu, take advice from one 27 of the anisations listed under Further help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. ation about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。雖然存在這些局限性，但只要選用適當(dāng)，考慮周到，齒輪傳動(dòng)總不失為一種最可靠、 最經(jīng)濟(jì)、用得最多的傳動(dòng)形式。 四、主要參考 文獻(xiàn)： 1. 機(jī)械設(shè)計(jì)手冊 2. 齒輪設(shè)計(jì)手冊 學(xué) 生（簽名） 張 鵬 年 月 日 指 導(dǎo) 教師（簽名） 年 月 日 教研室主任（簽名） 年 月 日 系 主 任（簽名） 年 月 日 25 畢業(yè)設(shè)計(jì)（論文）開題報(bào)告 設(shè)計(jì)（論文）題目 盤磨機(jī)齒輪減速器的設(shè)計(jì) 一、選題的背景和意義： 減速器中齒輪傳動(dòng)具有傳動(dòng)比準(zhǔn)確，可用的傳動(dòng)比、圓周速度和傳遞功率的范圍都很大，以及傳動(dòng)效率高，使用壽命長，結(jié)構(gòu)緊湊，工作可靠等一系列優(yōu)點(diǎn)。 5%。我也要感謝我的母校常州信息學(xué)院 ，是她提供了良好的學(xué)習(xí)環(huán)境和生活環(huán)境，讓我的大學(xué)生活豐富多姿，為我的人生留下精彩的一筆。在 本設(shè)計(jì) 的寫作過程中，老師給了我 極大 的 指導(dǎo)和 幫助。邊學(xué)邊用這樣才會(huì)提高效率，這是我作本次課程 設(shè)計(jì)的第二大收獲。我們是在作設(shè)計(jì)，但我們不是藝術(shù)家。在已度過的大三的時(shí)間里我們大多數(shù)接觸的是專業(yè)基礎(chǔ)課。機(jī)體外型簡單，拔模方便 . 、對附件設(shè)計(jì) A 視孔蓋和窺視孔 在機(jī)蓋頂部開有窺視孔，能看到 傳動(dòng)零件齒合區(qū)的位置，并有足夠的空間，以便于能伸入進(jìn)行操作，窺視孔有蓋板，機(jī)體上開窺視孔與凸緣一塊，有便于機(jī)械加工出支承蓋板的表面并用墊片加強(qiáng)密封，蓋板用鑄鐵制成，用 M6 緊固 B 油螺塞： 放油孔位于油池最底處，并安排在減速器不與其他部件靠近的一側(cè)，以便放油，放油孔用螺塞堵住，因此油孔處的機(jī)體外壁應(yīng)凸起一塊，由機(jī)械加工成螺塞頭部的支承面，并加封油圈加以密封。 、 減速器的密封：減速器的密封是為了防止漏油和外界灰塵和水等進(jìn)入常見的漏油部位有 分箱面、軸頭、蓋端及視孔蓋等。 、 潤滑劑的選擇：潤滑劑的選擇與傳動(dòng)類型、載荷性質(zhì)、工作條件、轉(zhuǎn)動(dòng)速度等多種因素有關(guān)。為了 減小齒輪的阻力和油的升溫，齒輪浸入油中的深度以 1— 2 個(gè)齒高為宜，速度高時(shí)還應(yīng)淺些，在 個(gè)齒高上下，但至少要有 10mm,速度低時(shí)，允許浸入深度達(dá) 1/6— 1/3 的大齒輪頂圓半徑。 m Mec3=√ MC32*MC32+α *T3*α *T3= N m MC32=MC1=743 N m 、求合成彎矩。 求支反力：由∑ MA=0，得 FVB2LFr2L/2=0 18 得 FVB2=1664N FVA2=Fr2FVB2=1664N FVB3LFr3L/2=0 得 FVB3=1256N FVA3=Fr3FVB=1256N 求截面 C左側(cè)的彎矩： MVC21=FVA2L/2 =832N 17 、求水平平面內(nèi)的支反力及彎矩。 因兩軸頭安裝聯(lián)軸器和滾動(dòng)軸承，按轉(zhuǎn)矩 T3= 15 為保證齒輪固定可靠，且遠(yuǎn)離電動(dòng)機(jī)，初選 I 軸軸段 1(與聯(lián)軸器接觸段 )長度為 l1=50mm，軸段 2與軸承配合，取 l2=15mm， l3=82mm， l4=55mm，為保證齒輪端面與箱體內(nèi)壁不相碰，即軸承拆卸方便，齒輪端面與箱體內(nèi)壁應(yīng)留有一定間隙，取兩者間距為 14mm，即軸段 5 長為 l5=14mm；根據(jù)軸承寬度 15mm，取軸段 6取 l6=15mm； 軸 1總尺寸 LI1= l1+ l2+ l3+ l4+ l5+ l6=231mm II 軸： 、按扭轉(zhuǎn)強(qiáng)度估算最小直徑 齒輪選用 45 鋼，并經(jīng)調(diào)質(zhì)處理，由相關(guān)資料查得：抗拉強(qiáng)度σb=640MPa，許用彎曲應(yīng)力 [σ 1]b=60MPa ； C=107～ 118，取 C=110，可得 d2≥ C 322nP=110 3 mm= mm 因兩軸頭安裝滾動(dòng)軸承，按轉(zhuǎn)矩 T2= 齒輪相關(guān)參數(shù)： 級(jí)別 Z1 Z2 齒寬 齒頂圓 高速級(jí) 23 69 b1 =48 b2 =55 d1a =52 d2a =148 低速級(jí) 31 74 b3 =65 b4=70 d3a = d4a = 各軸的相關(guān)參數(shù)： 軸名 功率 p/kw 轉(zhuǎn)矩 T/ 轉(zhuǎn)速 n/（ ） 電動(dòng)機(jī)軸 1 1440 2軸 480 3軸 200 I 軸 (電動(dòng)機(jī)軸 )： 、按扭轉(zhuǎn)強(qiáng)度估算最小直徑 齒輪選用 45 鋼，并經(jīng)正火處理，由相關(guān)資料查得：抗拉強(qiáng)度σb=590MPa，許用彎曲應(yīng)力 [σ 1]b=55MPa ； C=107～ 118