【正文】
HaK 、 FaK 由《 參考文獻三 》表 6— 9查得 1HaK = 1FaK = 2HaK = 2FaK = ( 5)行星輪間載荷分配不均勻系數(shù) HpK 由《參考文獻三 》式 7— 13 得 HpK =1+( 39。 在 2H— K型行星齒輪傳動中,其受力分析 圖是由運動的輸入件開始,然后依次確定各構(gòu)件上所受的作用力和轉(zhuǎn)矩。ad = 轉(zhuǎn)臂 H作用于行星輪 g的切向力為 HgF =2 agF =4000aT /wn 39。ad — 中心輪 a的節(jié)圓直徑,㎜ 39。為此,應(yīng)使均載構(gòu)件上所受力的較大,因為,作用 力大才能使其動作靈敏、準確。 第六章 行星輪架與輸出軸間齒輪傳動的設(shè)計 已知:傳遞功率 P=150w,齒輪軸轉(zhuǎn)速 n=1600r/min,傳動比 i=,載荷平穩(wěn)。 由《參考文獻四》式 10— 13可得 ? ?1H? = 1NTZ lim1H? / HS = 560/1=588 Mpa ? ?2H? = 2NTZ lim2H? / HS = 530/1= Mpa (三)按齒根彎曲疲勞強度計算 由《參考文獻四》式 10— 24 得出 F? ,如 12 1 11 11aad d m z? ? ? ? ? ?則校核合格。a =b、作水平面內(nèi)彎矩圖( 72a)。tantFa= tan 020 = 法向力: nF = tF /cos39。s Zhangye city during their journey to Kazakhstan, May 5, 2022. The caravan, consisting of more than 100 camels, three horsedrawn carriages and four support vehicles, started the trip from Jingyang county in Shaanxi on Sept 19, 2022. It will pass through Gansu province and Xinjiang Uygur autonomous region, and finally arrive in Almaty, formerly known as AlmaAta, the largest city in Kazakhstan, and Dungan in Zhambyl province. The trip will cover about 15,000 kilometers and take the caravan more than one year to plete. The caravan is expected to return to Jingyang in March 2022. Then they will e back, carrying specialty products from Kazakhstan A small art troupe founded six decades ago has grown into a household name in the Inner Mongolia autonomous region. In the 1950s, Ulan Muqir Art Troupe was created by nine young musicians, who toured remote villages on horses and performed traditional Mongolian music and dances for nomadic families. The 54yearold was born in Tongliao, in eastern Inner Mongolia and joined the troupe in says there are 74 branch troupes across Inner Mongolia and actors give around 100 shows every year to local nomadic people. I can still recall the days when I toured with the troupe in the early 39。s president, who is also a renowned tenor, tells China Daily. During a tour in 1985, he went to a village and met an elderly local man, who told him a story about his friendship with a solider from Shenyang, capital of Northeast China39。 he wondered how in the world he came to belo。s cultural foray overseas, has been widely panned by its home audience. Retitled Empresses in the Palace, the American version has been shortened from its original 76 episodes at 45 minutes each, to six 90minute episodes. The quick pacing threw off many native viewers, who are accustomed to a more leisurely daytimesoapstyle narrative rhythm. (Chinese TV stations would run two or three episodes every day.) I did not finish the fulllength version and found the truncated one not difficult to follow. What39。t help but sing the folk songs, Nasun says. The vastness of Inner Mongolia and the lack of entertainment options for people living there, made their lives lonely. The nomadic people were very excited about our visits, Nasun recalls. We didn39。支點反力為: HF =tF /2= 彎矩為: 1HM = 2HM = c、作垂直 面內(nèi)的彎矩圖( 74b) ,支點反力為: vF = rF /2= 彎矩為: 1vM = 2vM = d、作合成 彎矩圖( 74c): 1M = 2211HVMM? = 2214 44 1. 7 52 57? = N mm 2M = 22HVMM? = 226993 .38 2545 .7? = N mm e、作轉(zhuǎn)矩圖 (74d): T= HT =aT *( 1+P) = ( 1+) = N*mm f、求當量彎矩 1eM = 221 ()M aT? = 221 5 3 6 8 .7 ( 0 .6 4 6 5 5 )??= N mm 2222()eM M aT??= 7 4 4 2 .3 ( 0 .6 4 6 5 5 )??= mm g、校核強度 1e? = 1eM /W= 312 = 2e? = 2eM /W= 312 = 所以 滿足 e?? ? ?1b?? =55Mpa的條件,故設(shè)計的軸有足夠的強度,并有一定裕量。 (二)行星輪系減速器齒輪輸出軸的設(shè)計 選擇軸的材料,確定許用應(yīng)力 由已知條件: 齒輪軸選用 45 鋼正火 ,由《參考文獻四》表 14— 4 查得強度極限 B? =600MPa,再由表 14— 2得許用彎曲應(yīng)力 ? ?1b?? =55MPa 按扭轉(zhuǎn)強度估算軸徑 39。 由《參考文獻四》表 10— 3取標準模數(shù) m=1 (四)主要尺寸計算 1d = 2d =mz=1 11mm=11mm 1b =2b = d? 1d =1 11mm=11mm a=1/2 m(1z +2z )=1/2 1 (11+11)mm=11mm (五)驗算齒輪的圓周速度 v v=? 1d 1n /60 1000=? 11 1600/60 1000=由《參考文獻四》表 10— 22,可知選用 8級精度是合適的。 (一)輪材料及精度等級 行星輪架內(nèi)齒圈選用 45 鋼調(diào)質(zhì),硬度為 220~ 250HBS,齒輪軸選用 45鋼正火,硬度為 170~ 210HBS,選用 8 級精度,要求齒面粗糙度 aR ? ~ m? 。 (4)均載機構(gòu)應(yīng)制造容易,結(jié)構(gòu)簡單、緊湊、布置方便,不得影響到行星齒輪傳動性能。這些是由于在其結(jié)構(gòu)上采用 了多個( wn ? 2)行星輪的傳動方式,充分利用了同心軸齒輪之間的空間,使用了多個行星輪來分擔載荷,形成功率分流,并合理地采用了內(nèi)嚙合傳動;從而,才使其具備了上述的許多優(yōu)點。ad = 轉(zhuǎn)臂 H上所的力矩為 HT = wn gHF xr =4000 aT / 39。 由于在輸入件中心輪 a 上受有 wn 個行星輪 g同時施加的作用力 gaF 和輸入轉(zhuǎn)矩 AT 的作用。HpK= 所以 1HpK =1+( 39。 對于非變位或高度變位傳動,有 m/2(az +gz )=m/2(bz gz ) 得 gz =bz az /2=6315/2=24 保證多個行星輪均布裝入兩個中心輪的齒間 —— 裝配條件 想鄰兩個行星輪所夾的中心角 H? =2π /wn 中心輪 a相應(yīng)轉(zhuǎn)過 1? 角, 1? 角必須等于中心輪 a轉(zhuǎn)過 ? 個(整數(shù))齒所對的中心角, 即 1? =? *2π /az 式中 2π /az 為中心輪 a轉(zhuǎn)過一個齒(周節(jié))所對的中心角。 2) 行星減速器其優(yōu)點是結(jié)構(gòu)比較緊湊,回程間隙小、精度較高,使用壽命很長,額定輸出扭矩可以做的很大。 第二章 原始數(shù)據(jù)及 系統(tǒng)組成框圖 (一)有關(guān)原始數(shù)據(jù) 課題 : 一種自動洗衣機行星輪系減速器的設(shè)計 原始數(shù)據(jù)及工 作條件: 使用地點:自動洗衣機減速離合器內(nèi)部減速裝置; 傳動比: pi = 輸入轉(zhuǎn)速 :n=2600r/min 輸入功率: P=150w 行星輪個數(shù): wn =3 內(nèi)齒圈齒數(shù) bz =63 (二)系統(tǒng)組成框圖 圖 21 自動洗衣機的組成簡圖 自動洗衣機的工作原理: 見圖 22 圖 22 洗衣機工作 原理圖 洗滌: A制動, B放開,運動經(jīng)電機、帶傳動、中心齒輪、行星輪、行星架、波輪 脫水: A放開, B制動,運動經(jīng)電機、帶傳動、內(nèi)齒圈(脫水桶)、中心齒輪、行星架、波輪與脫水桶等速旋轉(zhuǎn)。行星輪減速其實就是齒輪減速的原理 ,它有一個軸線位置固定的齒輪叫中心輪或太陽輪 ,在太陽輪邊上有軸線變動的齒輪 ,即既作自轉(zhuǎn)又作公轉(zhuǎn)的齒輪叫行星輪 ,行星輪有支持構(gòu)件叫行星架 ,通過行星架將動力傳到軸上 ,再傳給其它齒輪 .它們由一組若干個齒輪組成一個輪系 .只有一個原動件 ,這種周轉(zhuǎn)輪系稱為行星輪系 . 關(guān)鍵詞:行星輪系減速器、行星輪、中心輪、行星架。但隨著人們對行星傳動技術(shù)進一步的深入地了解和掌握以及對國外行星傳動技術(shù)的引進和消化吸收, 令 其傳動結(jié)構(gòu)和均載方式都不斷完善, 加上 生產(chǎn)工藝水平也不斷提高, 致使如今能 完全可以制造出較好的行星齒輪傳動減速器。我所設(shè)計的行星齒輪是 2K— H行星傳動 NGW型。但是一般體積較大,傳動效率不高,精度不高 。 保證中心輪、內(nèi)齒輪和行星架軸 線重合 —— 同軸條件 為保證行星輪 gz 與兩個中心輪 az 、 bz 同時正確嚙合,要求外嚙合齒輪 a— g的中心距等于內(nèi)嚙合齒輪 b— g的中心距,即 w(a)ag? =()wbga ? 稱為同軸條件。HpK1) 由《參考文獻三 》圖 7— 19 得 39。對于直齒圓柱齒輪的嚙合齒輪副只需繪出切向力 F,如圖 1— 3所示。ad = 轉(zhuǎn)臂 H上所的作用力為 gHF =2 HgF =4000aT /wn 39。bd — 內(nèi)齒輪 b的節(jié)圓直徑,㎜ xr — 轉(zhuǎn)臂 H 的回轉(zhuǎn)半徑,㎜ 根 據(jù)《參考文獻三 》式( 6— 37)得 aT / HT =1/baHi =1/1Habi =1/1+P 轉(zhuǎn)臂 H的轉(zhuǎn)矩為 HT =aT *( 1+P) =