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Based on the working condition of the tractor, a new type of electric tractor drive system which combines a motor and a gear, and the evaluation index and the calculation method for dynamic performance of electric tractor are suggested; taking an electric tractor drive system as design object, the balance graph of drive-resistance force, climbable gradient under different shifts, and continuous working time are calculation analyzed.

根據(jù)電動(dòng)拖拉機(jī)作業(yè)特點(diǎn)，提出了一種電動(dòng)機(jī)和變速箱相結(jié)合的電動(dòng)拖拉機(jī)傳動(dòng)系統(tǒng)結(jié)構(gòu)方案女人香蕉久久毛毛片精品，并給出了電動(dòng)拖拉機(jī)動(dòng)力性能和經(jīng)濟(jì)性能評(píng)價(jià)指標(biāo)以及電驅(qū)動(dòng)系統(tǒng)主要參數(shù)的設(shè)計(jì)計(jì)算方法日韩丝袜清纯自拍视频在线观看，以基于串勵(lì)直流電動(dòng)機(jī)的某型號(hào)小四輪電動(dòng)拖拉機(jī)電驅(qū)動(dòng)系統(tǒng)為設(shè)計(jì)實(shí)例，計(jì)算分析了該電動(dòng)拖拉機(jī)的驅(qū)動(dòng)力-行駛阻力平衡圖全免费又大粗又黄又爽、不同擋位下的爬坡度以及連續(xù)作業(yè)時(shí)間。

Researches show that the drive force characteristics of the electric tractor drive system based on series DC motor is close the ideal characteristics, the curves are concave, low speed with constant power, and high speed with constant torque; the electric tractor has large working speed under different shifts, but the extensive coincidence speed shows that the variable ratio of the gear is unreasonable; the maximum climbable gradient of this electric tractor is more than 30%, and does not need frequent shift when working for its extensive climbable gradient; there are many influence factors of continuous working time, which the more obvious factors are working speed and working load, the working time increases with the increase of the working speed and working load.2. Simulation researches on the drive characteristic of the electric tractor.

研究結(jié)果表明：基于串勵(lì)直流電動(dòng)機(jī)(來源：ABC21論文網(wǎng)www.abclunwen.com)的電動(dòng)拖拉機(jī)電驅(qū)動(dòng)系統(tǒng)的驅(qū)動(dòng)力特性場接近理想驅(qū)動(dòng)力特性場欧美性爱A√视频在线，其各擋下的驅(qū)動(dòng)力特性是一組下凹的曲線国产男女激情一区二区，低速恒轉(zhuǎn)矩，高速恒功率在线视频懂；同一行駛速度下所對(duì)應(yīng)高擋驅(qū)動(dòng)力大于低擋驅(qū)動(dòng)力91午夜黄色视频，這是由電機(jī)的調(diào)速特性決定的；電動(dòng)拖拉機(jī)各個(gè)擋位下具有較廣的穩(wěn)定作業(yè)速度范圍久久网色，但是各個(gè)擋位之間速度重合的范圍較多欧美性中文，說明所用變速箱變速比與電動(dòng)機(jī)匹配不合理；電動(dòng)拖拉機(jī)最大爬坡度達(dá)到30%以上国产无遮挡又黄又爽免费网站，并且各擋爬坡度變化范圍較廣色播66，作業(yè)過程中不需要頻繁換擋；影響電動(dòng)拖拉機(jī)連續(xù)作業(yè)時(shí)間的因素較多国产精品一线在线播放，其中作業(yè)行駛速度和作業(yè)負(fù)荷影響最為明顯久久强奸网址，作業(yè)負(fù)荷越大，連續(xù)作業(yè)時(shí)間就越短国产专区自拍，作業(yè)速度越快国产美女一级牲交片在线观看，連續(xù)作業(yè)時(shí)間就越短。2人人人人人人人人操人人人人人人人人、電動(dòng)拖拉機(jī)驅(qū)動(dòng)特性仿真研究欧美性爱啊啊啊啊。

The conclusion is that the maximal gradient: of the tractor skidding trail depends on: the adhesive force while the tractor is uphill without load, when the full loaded tractor is downhill using the engine to brake the tractor and control the tractor velocity, the reliable lubrication of the engine.

結(jié)論是：規(guī)范關(guān)于集材坡道最大坡度的規(guī)定，主要由空車上坡時(shí)附著力、重載下坡時(shí)利用發(fā)動(dòng)機(jī)制動(dòng)且變速器掛低檔控制拖拉機(jī)下滑速度及保證發(fā)動(dòng)機(jī)可靠潤滑等因素決定色妞色视频一区二区三区。

tractor biplane：拉式雙翼機(jī)

tractor automatic arc welding machine 拖車式自動(dòng)電焊機(jī) | tractor biplane 拉式雙翼機(jī) | tractor dozer 履帶式拖拉機(jī)

Tractor,crawler：履帶式牽引車

"牽引鏟土機(jī)","Tractor shovel" | "履帶式牽引車","Tractor,crawler" | "前輪牽引車","Tractor,half track"

Tractor Truck：拖車頭

tractor-trailertrain 牽引列車 | tractor-trailertrucking 牽引式掛車運(yùn)輸 | tractor-truck 拖車頭