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畢業(yè)論文-輕型貨車盤式制動(dòng)器總成設(shè)計(jì)-閱讀頁(yè)

2025-01-27 19:12本頁(yè)面
  

【正文】 力 1?F 和 2?F 的數(shù)值,則前、后輪制動(dòng)器同步抱死滑移,這時(shí)總制動(dòng)力和減速度達(dá)到最大值。 () 式中: 1G — 汽車前軸載荷;( N) 2G — 汽車后軸載荷;( N) 另外,由式( )得出 的 1uF 與 2uF 的關(guān)系式中, 對(duì)于同一輛汽車在實(shí)際載重不同時(shí), Ga 、 1G 、 2G 、 1L 、 2L 、 gh 均發(fā)生變化。 取?? 滿載: Nmg 3 7 2 4 a ???? mmLG gmLGGL aa ????? ??????????gguuuuhLhLFFGaFF???122121第三章 制動(dòng)器設(shè)計(jì)計(jì)算 16 mmLLL 1 0 5 4 82 6 5 012 ????? ? ? ? ? NhgLLGZ a 21 ?????? ? ? ? ? ? NhgLLGZ a 12 ?????? ? NGFF auu 2 9 7 9 7 2 4 021 ????? ? ???????? ???????? ????121221 2421??? Fh LGFGLhLhGFgaagga = 21 ?????? ?????? ??????? 112 uu FF Nfu ? Nfu ? 空載: NmgG a 2 6 9 5 ???? mmG gmGGL aa 5826 5026 95013 818221 ????? mmLLL 2 9 3 5 82 6 5 012 ????? ? ? ? ? NhgLLGZ a ?????? ? ? ? ? ? NhgLLGZ a ?????? ? NGFF auu 2 1 5 6 6 9 5 021 ????? ? ???????? ???????? ????121221 2421??? Fh LGFGLhLhGFgaagga =21 ?????? ?????? ??????? 112 uu FF Nfu ? Nfu ? 南京工業(yè)大學(xué)學(xué)士論文 17 汽車最大減速度下制動(dòng)力矩設(shè)計(jì)計(jì)算原理 隨著道路條件的不斷改善,現(xiàn)如今轎車和中小型客車的車速都設(shè)計(jì)的較高。如此,在確定轎車和中小型客車的同步附著系統(tǒng)0?時(shí),取值都較高。 基本原理: 求制動(dòng)器制動(dòng)力分配系數(shù)? 定義:前制動(dòng)器制動(dòng)力與汽車總制動(dòng)器制動(dòng)力之比,稱制動(dòng)器制動(dòng)力分配系數(shù),并以符號(hào)?表示。根據(jù)汽車前輪所需的最 大理論制動(dòng)力矩,初步選取制動(dòng)鉗體缸孔直徑 1D, 可由下面的公式算出: ( ) 式中: 1Awc— 盤式制動(dòng)器制動(dòng)鉗體缸孔的工作面積;( mm2) 1BF— 盤式制動(dòng)器制動(dòng)效能因數(shù); 10P— 前制動(dòng)管路的開啟壓力;( Mpa 或 N/mm2) a?— 主缸以后的機(jī)械效率; 1r— 制動(dòng)盤有效半徑;( m) P— 前制動(dòng)管壓;( Mpa 或 N/mm2) 確定盤式制動(dòng)器計(jì)算用的最大制動(dòng)力矩 由于考慮到汽車實(shí)際制動(dòng)時(shí)的最大輸出制動(dòng)力矩與理論值受很多因素影響而 發(fā)生改變,如制動(dòng)襯片與制動(dòng)盤接觸時(shí)不一定非常均勻使加制動(dòng)力、制動(dòng)襯片的摩擦系數(shù)受溫度變化而發(fā)生改變等一些因素。但受到輪輞內(nèi)徑的限制,制 動(dòng)盤與輪輞之間應(yīng)保持相當(dāng)?shù)拈g隙,否則不僅散熱條件太差,而且輪輞受熱可能粘住內(nèi)胎。 那么,在式( )有效半徑的計(jì)算中, 2R的取值一般與2/bD相同,而 1R的值為2R與襯塊寬度之差,而襯塊寬度 1b一般由供銷商提供標(biāo)準(zhǔn)。即: ? ? 121 ?????? RRD ( ) 在設(shè)計(jì)計(jì)算中,只有式( )成立, 1D的值才能基 本上確定。 盤式制動(dòng)器制動(dòng)效能因數(shù) 1BF的校核計(jì)算 制動(dòng)效能因數(shù)是指在制動(dòng)鼓或制動(dòng)盤的作用半徑上所得到的摩擦力與輸入力之比。其中: 1110 PAwc? ( ) 式中: 1Awc—制動(dòng)鉗缸孔面積;( mm2) 1P—前輪制動(dòng)管壓;( MPa 或 N/mm2) 101101 2FFBF ??11011 2 rFu ??南京工業(yè)大學(xué)學(xué)士論文 23 由: 和式( )、式( )可得出: mNrPDuM u ????????? 0 1 41 1 3 2112111 ? max1uM?? () 式中: 1D—制動(dòng)鉗缸孔直徑;( mm) 上式為前輪盤式制動(dòng)器總的制動(dòng)力矩與摩擦系數(shù)、制動(dòng)管壓的關(guān)系式。在制動(dòng)強(qiáng)度 很大的緊急制動(dòng)過程中,制動(dòng)器幾乎承擔(dān)了汽車全部動(dòng)能耗散的任務(wù)。這就是所謂制動(dòng)器的能量負(fù)荷。由于汽車的總重及制動(dòng)襯塊的摩擦面積各不相同?,F(xiàn)常用的指標(biāo)是比能量耗散率,即每單位襯塊摩擦面積的每單位時(shí)間耗散的能量。 比能量耗散率 1e計(jì)算 盤式制動(dòng)器的比能量耗散率求解公式為: ( ) 式中:Ga—滿載 時(shí)汽車總重量;( N) 1?—前輪回轉(zhuǎn)質(zhì)量換算系數(shù); v、 2—制動(dòng)初速度和終速度;( m/s) g—重力加速度 4211 ?DAwc????????????jvvtgtAvvGae2110222111 2)(21 ??第四章 盤式制動(dòng)器校核計(jì)算 24 j—制動(dòng)減速度; (m/s2) t—制動(dòng)時(shí)間;( s) 10A—制動(dòng)襯塊摩擦面積;( mm) ?—制動(dòng)力分配系數(shù); 在緊急制動(dòng)到停車的情況下,02?v,并可認(rèn)為01??;故式( )可得出: 210211 ???? ???? gt AvGe a ? sjvt ???? ( ) 一般在校核 1e時(shí),一般取smhKmv /??、gj ?為計(jì)算值。比摩擦力愈大,則摩擦將愈嚴(yán)重。 雖然有點(diǎn)陌生,且在剛開始的圖紙?jiān)O(shè)計(jì)和論文寫作過程中,有 時(shí)感覺很辛苦,有時(shí)還會(huì)產(chǎn)生放棄的念頭,但是最終堅(jiān)持了下來,出色的完成了我的畢業(yè)設(shè)計(jì)。在指導(dǎo)老師的指點(diǎn)下,通過各種渠道開始準(zhǔn)備工作 — 通過網(wǎng)絡(luò)、圖書館搜集相關(guān)學(xué)術(shù)論文、核心期刊、書籍等。同時(shí)特意瀏覽了大量的外文網(wǎng)站,并將這些內(nèi)容列成提綱,便于以后查詢,以減少后期工作量 接下來,我開始對(duì)所搜集的資料進(jìn)行整理、分析研究。作為機(jī)械專業(yè)的學(xué)生, CAD 對(duì)于我們并不陌生,但是在機(jī)械制圖方面過于薄弱使我在進(jìn)度上有點(diǎn)跟不上,所以我特地鞏固了我的制圖和讀圖能力,最終完成了 CAD 圖紙的設(shè)計(jì)。在工作中要學(xué)會(huì)與人合作的態(tài)度,認(rèn)真聽取別人的意見,這樣做起事情來就可 以事倍功半。 1988. [ 25] . Luo ACJ. A theory for nonsmooth dynamical systems on connectable domains. Commun Nonlinear Sci Numer Simul 2022. 致謝 28 致謝 論文的順利完成,首先我要感謝我的指導(dǎo)老師蘇小平老師以及一直幫助我的王強(qiáng) 、 王東海老師和周圍同學(xué)朋友,感謝他們提出寶貴的意見和建議。 致謝 29 為你提供優(yōu)秀的畢業(yè)論文參考資料,請(qǐng)您刪除以下內(nèi)容, O(∩ _∩ )O 謝謝?。?! A large group of tea merchants on camels and horses from Northwest China39。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。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。t just about sharing art with nomadic families but also about gaining inspiration for the music and dance. Ulan Muqir literally translates as red burgeon, and today39。s villages and entertain nomadic families, but their fame has spread around the world. On May 16 and 17, nearly 100 singers and dancers from the troupe performed at Beijing39。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 Chin
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