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汽車發(fā)動(dòng)機(jī)檢測(cè)與維修論文doc-全文預(yù)覽

  

【正文】 然而 由于導(dǎo)電盤的慣性作用,電流經(jīng)蓄電池正極 — 30接住 — 吸拉線圈 — 保持線圈 — 搭鐵,此時(shí)吸拉線圈與保持線圈產(chǎn)生相反的磁場(chǎng)力使導(dǎo)電盤與接線柱斷開,同時(shí)在彈簧的作用下,鐵芯迅速回位,啟動(dòng)機(jī)的主電路被切斷,啟動(dòng)完畢。 ( 2)減速啟動(dòng)機(jī) :啟動(dòng)機(jī)與驅(qū)動(dòng)齒輪之間增設(shè)了一個(gè)減速裝置,起到減速增矩的功能。 外嚙合式減速機(jī)構(gòu)在電樞軸和啟動(dòng)機(jī)驅(qū)動(dòng)齒輪之間利用惰輪作用中間傳動(dòng),且電磁開關(guān)鐵芯與驅(qū)動(dòng)齒輪同軸心,直接推動(dòng)驅(qū)動(dòng)齒輪進(jìn)行嚙合,無(wú)需撥叉,一般用在小功率的啟動(dòng)機(jī)上,如圖 6 所示 內(nèi)嚙合式減速機(jī)構(gòu)傳動(dòng)中心距小,可有較大的減速比,故適用于大功率的啟動(dòng)機(jī)。 ( 2) 電樞移動(dòng)式:它是靠起動(dòng)機(jī)磁極磁通的吸力,使電樞沿軸向移動(dòng),而使小齒輪嚙入飛輪齒內(nèi),啟動(dòng)后再由回位彈簧使電樞回位,讓驅(qū)動(dòng)齒輪退出飛輪齒圈。 ( 2) 永磁式啟動(dòng)機(jī) :以永久磁鐵作為啟動(dòng)機(jī)的磁極,應(yīng)用較少。動(dòng)力傳動(dòng)機(jī)構(gòu)由飛輪齒環(huán)和電機(jī)軸上的小齒輪及行星齒輪機(jī)構(gòu)、單向離合器等組成,發(fā)動(dòng)機(jī)啟動(dòng)時(shí),啟動(dòng)機(jī)驅(qū)動(dòng)齒輪在電磁開關(guān)與撥叉的共同作用下,與發(fā)動(dòng)機(jī)飛輪齒環(huán)相嚙合,電動(dòng)機(jī)轉(zhuǎn)動(dòng)通過(guò)減速機(jī)構(gòu)減速增矩的作用,再通過(guò)小齒輪驅(qū)動(dòng)發(fā)動(dòng)機(jī)曲軸旋轉(zhuǎn)。(主要控制啟動(dòng)機(jī)起動(dòng)電流的通斷以及控制驅(qū)動(dòng)齒輪與發(fā) 5 動(dòng)機(jī)飛輪的嚙合與分離) ( 3) 傳動(dòng)機(jī)構(gòu)組成 :單向離合器、撥叉 、回位彈簧、驅(qū)動(dòng)齒輪、行星齒輪機(jī)構(gòu)。端蓋分前、后兩個(gè),前端蓋由鋼板壓制而成,后端蓋由灰口鑄鐵澆制而成。電刷置于電刷架中,正電刷與勵(lì)磁繞組的末端相連,負(fù)電刷負(fù)極刷架打鐵。每個(gè)磁極上饒有勵(lì)磁繞組,兩對(duì)磁極相對(duì)交錯(cuò)安裝在電動(dòng)機(jī)定子內(nèi)殼上。 直流電動(dòng)機(jī)由電樞、磁極、殼體等主要部件構(gòu)成。 作用 發(fā)動(dòng)機(jī)在燃料供給系統(tǒng)、點(diǎn)火系統(tǒng)、汽缸壓力正常的情況下依靠外力使汽車發(fā)動(dòng)機(jī)曲軸的轉(zhuǎn)速達(dá)到一定適應(yīng)值即可自動(dòng)運(yùn)行。 關(guān)鍵詞: 啟動(dòng)機(jī):故障檢測(cè):故障排除 2 Summary In this paper the startup machine as the center, this article will be divided into five most. First of all a general described the startup system position, working process and principle, and then start machine as the startup system is the important ponent of detailed and prehensive introduction to start machine structure, play a role, the main types and the mon principle of several start machine figure, and in principle the graph is an opportunity, deeply describes the startup process and the principle of the machine work. In addition, with auto possession of year by year climbed, auto aftersales service quality especially the maintenance technology still needs further strengthen, or a car service market to meet consumer demand, so this paper from the point of view of car maintenance, detailed start to describe the major ponents of the machine maintenance and overhaul method, start machine mon failure detection steps and elimination method, and finally for the car in real use started in in machine machine start typical fault cases and adverse reaction makes
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